2027 lines
37 KiB
ArmAsm
2027 lines
37 KiB
ArmAsm
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2005,2006,2007,2008,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* Note: These functions defined in this file may be called from C.
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* Be careful of that you must not modify some registers. Quote
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* from gcc-2.95.2/gcc/config/i386/i386.h:
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1 for registers not available across function calls.
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These must include the FIXED_REGISTERS and also any
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registers that can be used without being saved.
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The latter must include the registers where values are returned
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and the register where structure-value addresses are passed.
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Aside from that, you can include as many other registers as you like.
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ax,dx,cx,bx,si,di,bp,sp,st,st1,st2,st3,st4,st5,st6,st7,arg
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{ 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }
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*/
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/*
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* Note: GRUB is compiled with the options -mrtd and -mregparm=3.
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* So the first three arguments are passed in %eax, %edx, and %ecx,
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* respectively, and if a function has a fixed number of arguments
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* and the number is greater than three, the function must return
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* with "ret $N" where N is ((the number of arguments) - 3) * 4.
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*/
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#include <config.h>
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#include <grub/symbol.h>
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#include <grub/boot.h>
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#include <grub/machine/boot.h>
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#include <grub/machine/memory.h>
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#include <grub/machine/console.h>
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#include <grub/cpu/linux.h>
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#include <grub/machine/kernel.h>
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#include <grub/term.h>
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#include <multiboot.h>
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#include <multiboot2.h>
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#define ABS(x) ((x) - LOCAL (base) + GRUB_BOOT_MACHINE_KERNEL_ADDR + 0x200)
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.file "startup.S"
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.text
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/* Tell GAS to generate 16-bit instructions so that this code works
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in real mode. */
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.code16
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.globl start, _start
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start:
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_start:
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LOCAL (base):
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/*
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* Guarantee that "main" is loaded at 0x0:0x8200.
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*/
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#ifdef __APPLE__
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ljmp $0, $(ABS(LOCAL (codestart)) - 0x10000)
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#else
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ljmp $0, $ABS(LOCAL (codestart))
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#endif
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/*
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* Compatibility version number
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*
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* These MUST be at byte offset 6 and 7 of the executable
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* DO NOT MOVE !!!
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*/
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. = _start + 0x6
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.byte GRUB_BOOT_VERSION_MAJOR, GRUB_BOOT_VERSION_MINOR
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/*
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* This is a special data area 8 bytes from the beginning.
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*/
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. = _start + 0x8
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VARIABLE(grub_total_module_size)
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.long 0
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VARIABLE(grub_kernel_image_size)
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.long 0
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VARIABLE(grub_compressed_size)
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.long 0
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VARIABLE(grub_install_dos_part)
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.long 0xFFFFFFFF
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VARIABLE(grub_install_bsd_part)
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.long 0xFFFFFFFF
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VARIABLE(grub_prefix)
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/* to be filled by grub-mkimage */
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/*
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* Leave some breathing room for the prefix.
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*/
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. = _start + GRUB_KERNEL_MACHINE_DATA_END
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#ifdef APPLE_CC
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bss_start:
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.long 0
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bss_end:
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.long 0
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#endif
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/*
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* Support for booting GRUB from a Multiboot boot loader (e.g. GRUB itself).
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* This uses the a.out kludge to load raw binary to the area starting at 1MB,
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* and relocates itself after loaded.
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*/
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.p2align 2 /* force 4-byte alignment */
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multiboot_header:
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/* magic */
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.long 0x1BADB002
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/* flags */
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.long (1 << 16)
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/* checksum */
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.long -0x1BADB002 - (1 << 16)
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/* header addr */
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.long multiboot_header - _start + 0x100000 + 0x200
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/* load addr */
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.long 0x100000
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/* load end addr */
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.long 0
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/* bss end addr */
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.long 0
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/* entry addr */
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.long multiboot_entry - _start + 0x100000 + 0x200
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multiboot_entry:
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.code32
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/* obtain the boot device */
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movl 12(%ebx), %edx
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movl $GRUB_MEMORY_MACHINE_PROT_STACK, %ebp
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movl %ebp, %esp
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/* relocate the code */
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movl $(GRUB_KERNEL_MACHINE_RAW_SIZE + 0x200), %ecx
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addl EXT_C(grub_compressed_size) - _start + 0x100000 + 0x200, %ecx
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movl $0x100000, %esi
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movl $GRUB_BOOT_MACHINE_KERNEL_ADDR, %edi
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cld
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rep
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movsb
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/* jump to the real address */
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movl $multiboot_trampoline, %eax
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jmp *%eax
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multiboot_trampoline:
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/* fill the boot information */
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movl %edx, %eax
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shrl $8, %eax
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xorl %ebx, %ebx
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cmpb $0xFF, %ah
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je 1f
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movb %ah, %bl
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movl %ebx, EXT_C(grub_install_dos_part)
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1:
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cmpb $0xFF, %al
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je 2f
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movb %al, %bl
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movl %ebx, EXT_C(grub_install_bsd_part)
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2:
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shrl $24, %edx
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movb $0xFF, %dh
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/* enter the usual booting */
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call prot_to_real
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.code16
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/* the real mode code continues... */
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LOCAL (codestart):
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cli /* we're not safe here! */
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/* set up %ds, %ss, and %es */
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xorw %ax, %ax
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movw %ax, %ds
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movw %ax, %ss
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movw %ax, %es
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/* set up the real mode/BIOS stack */
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movl $GRUB_MEMORY_MACHINE_REAL_STACK, %ebp
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movl %ebp, %esp
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sti /* we're safe again */
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/* save the boot drive */
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ADDR32 movb %dl, EXT_C(grub_boot_drive)
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/* reset disk system (%ah = 0) */
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int $0x13
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/* transition to protected mode */
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DATA32 call real_to_prot
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/* The ".code32" directive takes GAS out of 16-bit mode. */
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.code32
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incl %eax
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call EXT_C(grub_gate_a20)
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#ifdef ENABLE_LZMA
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movl $GRUB_MEMORY_MACHINE_DECOMPRESSION_ADDR, %edi
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movl $(_start + GRUB_KERNEL_MACHINE_RAW_SIZE), %esi
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pushl %edi
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pushl %esi
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movl EXT_C(grub_kernel_image_size), %ecx
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addl EXT_C(grub_total_module_size), %ecx
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subl $GRUB_KERNEL_MACHINE_RAW_SIZE, %ecx
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pushl %ecx
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leal (%edi, %ecx), %ebx
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call _LzmaDecodeA
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/* _LzmaDecodeA clears DF, so no need to run cld */
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popl %ecx
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popl %edi
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popl %esi
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#endif
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/* copy back the decompressed part (except the modules) */
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subl EXT_C(grub_total_module_size), %ecx
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rep
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movsb
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#if 0
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/* copy modules before cleaning out the bss */
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movl EXT_C(grub_total_module_size), %ecx
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movl EXT_C(grub_kernel_image_size), %esi
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addl %ecx, %esi
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addl $_start, %esi
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decl %esi
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movl $END_SYMBOL, %edi
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addl %ecx, %edi
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decl %edi
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std
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rep
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movsb
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#endif
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#ifdef APPLE_CC
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/* clean out the bss */
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bss_start_abs = ABS (bss_start)
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bss_end_abs = ABS (bss_end)
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movl bss_start_abs, %edi
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/* compute the bss length */
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movl bss_end_abs, %ecx
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subl %edi, %ecx
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#else
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/* clean out the bss */
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movl $BSS_START_SYMBOL, %edi
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/* compute the bss length */
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movl $END_SYMBOL, %ecx
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subl %edi, %ecx
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#endif
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/* clean out */
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xorl %eax, %eax
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cld
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rep
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stosb
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/*
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* Call the start of main body of C code.
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*/
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call EXT_C(grub_main)
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/*
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* This is the area for all of the special variables.
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*/
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VARIABLE(grub_boot_drive)
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.byte 0
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.p2align 2 /* force 4-byte alignment */
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#include "../realmode.S"
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/*
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* grub_gate_a20(int on)
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*
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* Gate address-line 20 for high memory.
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*
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* This routine is probably overconservative in what it does, but so what?
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*
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* It also eats any keystrokes in the keyboard buffer. :-(
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*/
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FUNCTION(grub_gate_a20)
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movl %eax, %edx
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gate_a20_test_current_state:
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/* first of all, test if already in a good state */
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call gate_a20_check_state
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cmpb %al, %dl
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jnz gate_a20_try_bios
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ret
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gate_a20_try_bios:
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/* second, try a BIOS call */
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pushl %ebp
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call prot_to_real
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.code16
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movw $0x2400, %ax
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testb %dl, %dl
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jz 1f
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incw %ax
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1: int $0x15
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DATA32 call real_to_prot
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.code32
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popl %ebp
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call gate_a20_check_state
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cmpb %al, %dl
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jnz gate_a20_try_system_control_port_a
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ret
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gate_a20_try_system_control_port_a:
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/*
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* In macbook, the keyboard test would hang the machine, so we move
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* this forward.
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*/
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/* fourth, try the system control port A */
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inb $0x92
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andb $(~0x03), %al
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testb %dl, %dl
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jz 6f
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orb $0x02, %al
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6: outb $0x92
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/* When turning off Gate A20, do not check the state strictly,
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because a failure is not fatal usually, and Gate A20 is always
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on some modern machines. */
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testb %dl, %dl
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jz 7f
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call gate_a20_check_state
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cmpb %al, %dl
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jnz gate_a20_try_keyboard_controller
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7: ret
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gate_a20_flush_keyboard_buffer:
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inb $0x64
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andb $0x02, %al
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jnz gate_a20_flush_keyboard_buffer
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2:
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inb $0x64
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andb $0x01, %al
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jz 3f
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inb $0x60
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jmp 2b
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3:
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ret
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gate_a20_try_keyboard_controller:
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/* third, try the keyboard controller */
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call gate_a20_flush_keyboard_buffer
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movb $0xd1, %al
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outb $0x64
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4:
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inb $0x64
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andb $0x02, %al
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jnz 4b
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movb $0xdd, %al
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testb %dl, %dl
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jz 5f
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orb $0x02, %al
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5: outb $0x60
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call gate_a20_flush_keyboard_buffer
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/* output a dummy command (USB keyboard hack) */
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movb $0xff, %al
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outb $0x64
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call gate_a20_flush_keyboard_buffer
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call gate_a20_check_state
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cmpb %al, %dl
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/* everything failed, so restart from the beginning */
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jnz gate_a20_try_bios
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ret
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gate_a20_check_state:
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/* iterate the checking for a while */
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movl $100, %ecx
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1:
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call 3f
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cmpb %al, %dl
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jz 2f
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loop 1b
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2:
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ret
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3:
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pushl %ebx
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pushl %ecx
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xorl %eax, %eax
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/* compare the byte at 0x8000 with that at 0x108000 */
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movl $GRUB_BOOT_MACHINE_KERNEL_ADDR, %ebx
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pushl %ebx
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/* save the original byte in CL */
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movb (%ebx), %cl
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/* store the value at 0x108000 in AL */
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addl $0x100000, %ebx
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movb (%ebx), %al
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/* try to set one less value at 0x8000 */
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popl %ebx
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movb %al, %ch
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decb %ch
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movb %ch, (%ebx)
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/* serialize */
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outb %al, $0x80
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outb %al, $0x80
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/* obtain the value at 0x108000 in CH */
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pushl %ebx
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addl $0x100000, %ebx
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movb (%ebx), %ch
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/* this result is 1 if A20 is on or 0 if it is off */
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subb %ch, %al
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xorb $1, %al
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/* restore the original */
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popl %ebx
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movb %cl, (%ebx)
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popl %ecx
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popl %ebx
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ret
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#ifdef ENABLE_LZMA
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#include "lzma_decode.S"
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#endif
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/*
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* The code beyond this point is compressed. Assert that the uncompressed
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* code fits GRUB_KERNEL_MACHINE_RAW_SIZE.
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*/
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. = _start + GRUB_KERNEL_MACHINE_RAW_SIZE
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/*
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* This next part is sort of evil. It takes advantage of the
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* byte ordering on the x86 to work in either 16-bit or 32-bit
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* mode, so think about it before changing it.
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*/
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FUNCTION(grub_hard_stop)
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hlt
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jmp EXT_C(grub_hard_stop)
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/*
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* grub_stop_floppy()
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*
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* Stop the floppy drive from spinning, so that other software is
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* jumped to with a known state.
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*/
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FUNCTION(grub_stop_floppy)
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movw $0x3F2, %dx
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xorb %al, %al
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outb %al, %dx
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ret
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/*
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* grub_exit()
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*
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* Exit the system.
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*/
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FUNCTION(grub_exit)
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call prot_to_real
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.code16
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/* Tell the BIOS a boot failure. If this does not work, reboot. */
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int $0x18
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jmp cold_reboot
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.code32
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/*
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* grub_halt(int no_apm)
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*
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* Halt the system, using APM if possible. If NO_APM is true, don't use
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* APM even if it is available.
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*/
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FUNCTION(grub_halt)
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/* see if zero */
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testl %eax, %eax
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jnz EXT_C(grub_stop)
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call prot_to_real
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.code16
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/* detect APM */
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movw $0x5300, %ax
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xorw %bx, %bx
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int $0x15
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jc EXT_C(grub_hard_stop)
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/* don't check %bx for buggy BIOSes... */
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/* disconnect APM first */
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movw $0x5304, %ax
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xorw %bx, %bx
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int $0x15
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/* connect APM */
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movw $0x5301, %ax
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xorw %bx, %bx
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int $0x15
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jc EXT_C(grub_hard_stop)
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/* set APM protocol level - 1.1 or bust. (this covers APM 1.2 also) */
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movw $0x530E, %ax
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xorw %bx, %bx
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movw $0x0101, %cx
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int $0x15
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jc EXT_C(grub_hard_stop)
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/* set the power state to off */
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movw $0x5307, %ax
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movw $1, %bx
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movw $3, %cx
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int $0x15
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/* shouldn't reach here */
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jmp EXT_C(grub_hard_stop)
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.code32
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|
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/*
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* void grub_chainloader_real_boot (int drive, void *part_addr)
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*
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* This starts another boot loader.
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|
*/
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|
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FUNCTION(grub_chainloader_real_boot)
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pushl %edx
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pushl %eax
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|
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call EXT_C(grub_dl_unload_all)
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|
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/* Turn off Gate A20 */
|
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xorl %eax, %eax
|
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call EXT_C(grub_gate_a20)
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|
|
/* set up to pass boot drive */
|
|
popl %edx
|
|
|
|
/* ESI must point to a partition table entry */
|
|
popl %esi
|
|
|
|
call prot_to_real
|
|
.code16
|
|
ljmp $0, $GRUB_MEMORY_MACHINE_BOOT_LOADER_ADDR
|
|
.code32
|
|
|
|
#include "../loader.S"
|
|
|
|
/*
|
|
* int grub_biosdisk_rw_int13_extensions (int ah, int drive, void *dap)
|
|
*
|
|
* Call IBM/MS INT13 Extensions (int 13 %ah=AH) for DRIVE. DAP
|
|
* is passed for disk address packet. If an error occurs, return
|
|
* non-zero, otherwise zero.
|
|
*/
|
|
|
|
FUNCTION(grub_biosdisk_rw_int13_extensions)
|
|
pushl %ebp
|
|
pushl %esi
|
|
|
|
/* compute the address of disk_address_packet */
|
|
movw %cx, %si
|
|
xorw %cx, %cx
|
|
shrl $4, %ecx /* save the segment to cx */
|
|
|
|
/* ah */
|
|
movb %al, %dh
|
|
/* enter real mode */
|
|
call prot_to_real
|
|
|
|
.code16
|
|
movb %dh, %ah
|
|
movw %cx, %ds
|
|
int $0x13 /* do the operation */
|
|
movb %ah, %dl /* save return value */
|
|
/* back to protected mode */
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movb %dl, %al /* return value in %eax */
|
|
|
|
popl %esi
|
|
popl %ebp
|
|
|
|
ret
|
|
|
|
/*
|
|
* int grub_biosdisk_rw_standard (int ah, int drive, int coff, int hoff,
|
|
* int soff, int nsec, int segment)
|
|
*
|
|
* Call standard and old INT13 (int 13 %ah=AH) for DRIVE. Read/write
|
|
* NSEC sectors from COFF/HOFF/SOFF into SEGMENT. If an error occurs,
|
|
* return non-zero, otherwise zero.
|
|
*/
|
|
|
|
FUNCTION(grub_biosdisk_rw_standard)
|
|
pushl %ebp
|
|
movl %esp, %ebp
|
|
|
|
pushl %ebx
|
|
pushl %edi
|
|
pushl %esi
|
|
|
|
/* set up CHS information */
|
|
|
|
/* set %ch to low eight bits of cylinder */
|
|
xchgb %cl, %ch
|
|
/* set bits 6-7 of %cl to high two bits of cylinder */
|
|
shlb $6, %cl
|
|
/* set bits 0-5 of %cl to sector */
|
|
addb 0xc(%ebp), %cl
|
|
/* set %dh to head */
|
|
movb 0x8(%ebp), %dh
|
|
/* set %ah to AH */
|
|
movb %al, %ah
|
|
/* set %al to NSEC */
|
|
movb 0x10(%ebp), %al
|
|
/* save %ax in %di */
|
|
movw %ax, %di
|
|
/* save SEGMENT in %bx */
|
|
movw 0x14(%ebp), %bx
|
|
|
|
/* enter real mode */
|
|
call prot_to_real
|
|
|
|
.code16
|
|
movw %bx, %es
|
|
xorw %bx, %bx
|
|
movw $3, %si /* attempt at least three times */
|
|
|
|
1:
|
|
movw %di, %ax
|
|
int $0x13 /* do the operation */
|
|
jnc 2f /* check if successful */
|
|
|
|
movb %ah, %bl /* save return value */
|
|
/* if fail, reset the disk system */
|
|
xorw %ax, %ax
|
|
int $0x13
|
|
|
|
decw %si
|
|
cmpw $0, %si
|
|
je 2f
|
|
xorb %bl, %bl
|
|
jmp 1b /* retry */
|
|
2:
|
|
/* back to protected mode */
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movb %bl, %al /* return value in %eax */
|
|
|
|
popl %esi
|
|
popl %edi
|
|
popl %ebx
|
|
popl %ebp
|
|
|
|
ret $(4 * 4)
|
|
|
|
|
|
/*
|
|
* int grub_biosdisk_check_int13_extensions (int drive)
|
|
*
|
|
* Check if LBA is supported for DRIVE. If it is supported, then return
|
|
* the major version of extensions, otherwise zero.
|
|
*/
|
|
|
|
FUNCTION(grub_biosdisk_check_int13_extensions)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
|
|
/* drive */
|
|
movb %al, %dl
|
|
/* enter real mode */
|
|
call prot_to_real
|
|
|
|
.code16
|
|
movb $0x41, %ah
|
|
movw $0x55aa, %bx
|
|
int $0x13 /* do the operation */
|
|
|
|
/* check the result */
|
|
jc 1f
|
|
cmpw $0xaa55, %bx
|
|
jne 1f
|
|
|
|
movb %ah, %bl /* save the major version into %bl */
|
|
|
|
/* check if AH=0x42 is supported */
|
|
andw $1, %cx
|
|
jnz 2f
|
|
|
|
1:
|
|
xorb %bl, %bl
|
|
2:
|
|
/* back to protected mode */
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movb %bl, %al /* return value in %eax */
|
|
|
|
popl %ebx
|
|
popl %ebp
|
|
|
|
ret
|
|
|
|
|
|
/*
|
|
* int grub_biosdisk_get_cdinfo_int13_extensions (int drive, void *cdrp)
|
|
*
|
|
* Return the cdrom information of DRIVE in CDRP. If an error occurs,
|
|
* then return non-zero, otherwise zero.
|
|
*/
|
|
|
|
FUNCTION(grub_biosdisk_get_cdinfo_int13_extensions)
|
|
movw $0x4B01, %cx
|
|
jmp 1f
|
|
|
|
/*
|
|
* int grub_biosdisk_get_diskinfo_int13_extensions (int drive, void *drp)
|
|
*
|
|
* Return the geometry of DRIVE in a drive parameters, DRP. If an error
|
|
* occurs, then return non-zero, otherwise zero.
|
|
*/
|
|
|
|
FUNCTION(grub_biosdisk_get_diskinfo_int13_extensions)
|
|
movb $0x48, %ch
|
|
1:
|
|
pushl %ebp
|
|
pushl %ebx
|
|
pushl %esi
|
|
|
|
/* compute the address of drive parameters */
|
|
movw %dx, %si
|
|
andl $0xf, %esi
|
|
shrl $4, %edx
|
|
movw %dx, %bx /* save the segment into %bx */
|
|
/* drive */
|
|
movb %al, %dl
|
|
/* enter real mode */
|
|
call prot_to_real
|
|
|
|
.code16
|
|
movw %cx, %ax
|
|
movw %bx, %ds
|
|
int $0x13 /* do the operation */
|
|
jc noclean
|
|
/* Clean return value if carry isn't set to workaround
|
|
some buggy BIOSes. */
|
|
xor %ax, %ax
|
|
noclean:
|
|
movb %ah, %bl /* save return value in %bl */
|
|
/* back to protected mode */
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movb %bl, %al /* return value in %eax */
|
|
|
|
popl %esi
|
|
popl %ebx
|
|
popl %ebp
|
|
|
|
ret
|
|
|
|
|
|
/*
|
|
* int grub_biosdisk_get_diskinfo_standard (int drive,
|
|
* unsigned long *cylinders,
|
|
* unsigned long *heads,
|
|
* unsigned long *sectors)
|
|
*
|
|
* Return the geometry of DRIVE in CYLINDERS, HEADS and SECTORS. If an
|
|
* error occurs, then return non-zero, otherwise zero.
|
|
*/
|
|
|
|
FUNCTION(grub_biosdisk_get_diskinfo_standard)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
pushl %edi
|
|
|
|
/* push CYLINDERS */
|
|
pushl %edx
|
|
/* push HEADS */
|
|
pushl %ecx
|
|
/* SECTORS is on the stack */
|
|
|
|
/* drive */
|
|
movb %al, %dl
|
|
/* enter real mode */
|
|
call prot_to_real
|
|
|
|
.code16
|
|
movb $0x8, %ah
|
|
int $0x13 /* do the operation */
|
|
jc noclean2
|
|
/* Clean return value if carry isn't set to workaround
|
|
some buggy BIOSes. */
|
|
xor %ax, %ax
|
|
noclean2:
|
|
/* check if successful */
|
|
testb %ah, %ah
|
|
jnz 1f
|
|
/* bogus BIOSes may not return an error number */
|
|
testb $0x3f, %cl /* 0 sectors means no disk */
|
|
jnz 1f /* if non-zero, then succeed */
|
|
/* XXX 0x60 is one of the unused error numbers */
|
|
movb $0x60, %ah
|
|
1:
|
|
movb %ah, %bl /* save return value in %bl */
|
|
/* back to protected mode */
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
/* pop HEADS */
|
|
popl %edi
|
|
movb %dh, %al
|
|
incl %eax /* the number of heads is counted from zero */
|
|
movl %eax, (%edi)
|
|
|
|
/* pop CYLINDERS */
|
|
popl %edi
|
|
movb %ch, %al
|
|
movb %cl, %ah
|
|
shrb $6, %ah /* the number of cylinders is counted from zero */
|
|
incl %eax
|
|
movl %eax, (%edi)
|
|
|
|
/* SECTORS */
|
|
movl 0x10(%esp), %edi
|
|
andb $0x3f, %cl
|
|
movzbl %cl, %eax
|
|
movl %eax, (%edi)
|
|
|
|
xorl %eax, %eax
|
|
movb %bl, %al /* return value in %eax */
|
|
|
|
popl %edi
|
|
popl %ebx
|
|
popl %ebp
|
|
|
|
ret $4
|
|
|
|
|
|
/*
|
|
* int grub_biosdisk_get_num_floppies (void)
|
|
*/
|
|
FUNCTION(grub_biosdisk_get_num_floppies)
|
|
pushl %ebp
|
|
|
|
xorl %edx, %edx
|
|
call prot_to_real
|
|
|
|
.code16
|
|
/* reset the disk system first */
|
|
int $0x13
|
|
1:
|
|
stc
|
|
|
|
/* call GET DISK TYPE */
|
|
movb $0x15, %ah
|
|
int $0x13
|
|
|
|
jc 2f
|
|
|
|
/* check if this drive exists */
|
|
testb $0x3, %ah
|
|
jz 2f
|
|
|
|
incb %dl
|
|
cmpb $2, %dl
|
|
jne 1b
|
|
2:
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movl %edx, %eax
|
|
popl %ebp
|
|
ret
|
|
|
|
|
|
/*
|
|
*
|
|
* grub_get_memsize(i) : return the memory size in KB. i == 0 for conventional
|
|
* memory, i == 1 for extended memory
|
|
* BIOS call "INT 12H" to get conventional memory size
|
|
* BIOS call "INT 15H, AH=88H" to get extended memory size
|
|
* Both have the return value in AX.
|
|
*
|
|
*/
|
|
|
|
FUNCTION(grub_get_memsize)
|
|
pushl %ebp
|
|
|
|
movl %eax, %edx
|
|
|
|
call prot_to_real /* enter real mode */
|
|
.code16
|
|
|
|
testl %edx, %edx
|
|
jnz xext
|
|
|
|
int $0x12
|
|
jmp xdone
|
|
|
|
xext:
|
|
movb $0x88, %ah
|
|
int $0x15
|
|
|
|
xdone:
|
|
movw %ax, %dx
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movw %dx, %ax
|
|
|
|
popl %ebp
|
|
ret
|
|
|
|
|
|
/*
|
|
*
|
|
* grub_get_eisa_mmap() : return packed EISA memory map, lower 16 bits is
|
|
* memory between 1M and 16M in 1K parts, upper 16 bits is
|
|
* memory above 16M in 64K parts. If error, return zero.
|
|
* BIOS call "INT 15H, AH=E801H" to get EISA memory map,
|
|
* AX = memory between 1M and 16M in 1K parts.
|
|
* BX = memory above 16M in 64K parts.
|
|
*
|
|
*/
|
|
|
|
FUNCTION(grub_get_eisa_mmap)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
|
|
call prot_to_real /* enter real mode */
|
|
.code16
|
|
|
|
movw $0xe801, %ax
|
|
int $0x15
|
|
|
|
shll $16, %ebx
|
|
movw %ax, %bx
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
cmpb $0x86, %bh
|
|
je xnoteisa
|
|
|
|
movl %ebx, %eax
|
|
|
|
xnoteisa:
|
|
popl %ebx
|
|
popl %ebp
|
|
ret
|
|
|
|
/*
|
|
*
|
|
* grub_get_mmap_entry(addr, cont) : address and old continuation value (zero to
|
|
* start), for the Query System Address Map BIOS call.
|
|
*
|
|
* Sets the first 4-byte int value of "addr" to the size returned by
|
|
* the call. If the call fails, sets it to zero.
|
|
*
|
|
* Returns: new (non-zero) continuation value, 0 if done.
|
|
*/
|
|
|
|
FUNCTION(grub_get_mmap_entry)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
pushl %edi
|
|
pushl %esi
|
|
|
|
/* push ADDR */
|
|
pushl %eax
|
|
|
|
/* place address (+4) in ES:DI */
|
|
addl $4, %eax
|
|
movl %eax, %edi
|
|
andl $0xf, %edi
|
|
shrl $4, %eax
|
|
movl %eax, %esi
|
|
|
|
/* set continuation value */
|
|
movl %edx, %ebx
|
|
|
|
/* set default maximum buffer size */
|
|
movl $0x14, %ecx
|
|
|
|
/* set EDX to 'SMAP' */
|
|
movl $0x534d4150, %edx
|
|
|
|
call prot_to_real /* enter real mode */
|
|
.code16
|
|
|
|
movw %si, %es
|
|
movl $0xe820, %eax
|
|
int $0x15
|
|
|
|
DATA32 jc xnosmap
|
|
|
|
cmpl $0x534d4150, %eax
|
|
jne xnosmap
|
|
|
|
cmpl $0x14, %ecx
|
|
jl xnosmap
|
|
|
|
cmpl $0x400, %ecx
|
|
jg xnosmap
|
|
|
|
jmp xsmap
|
|
|
|
xnosmap:
|
|
xorl %ecx, %ecx
|
|
|
|
/* Apple's cc jumps few bytes before the correct
|
|
label in this context. Hence nops. */
|
|
#ifdef APPLE_CC
|
|
nop
|
|
nop
|
|
nop
|
|
nop
|
|
nop
|
|
nop
|
|
#endif
|
|
|
|
xsmap:
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
/* write length of buffer (zero if error) into ADDR */
|
|
popl %eax
|
|
movl %ecx, (%eax)
|
|
|
|
/* set return value to continuation */
|
|
movl %ebx, %eax
|
|
|
|
popl %esi
|
|
popl %edi
|
|
popl %ebx
|
|
popl %ebp
|
|
ret
|
|
|
|
|
|
/*
|
|
* void grub_console_putchar (const struct grub_unicode_glyph *c)
|
|
*
|
|
* Put the character C on the console. Because GRUB wants to write a
|
|
* character with an attribute, this implementation is a bit tricky.
|
|
* If C is a control character (CR, LF, BEL, BS), use INT 10, AH = 0Eh
|
|
* (TELETYPE OUTPUT). Otherwise, save the original position, put a space,
|
|
* save the current position, restore the original position, write the
|
|
* character and the attribute, and restore the current position.
|
|
*
|
|
* The reason why this is so complicated is that there is no easy way to
|
|
* get the height of the screen, and the TELETYPE OUTPUT BIOS call doesn't
|
|
* support setting a background attribute.
|
|
*/
|
|
FUNCTION(grub_console_putchar)
|
|
/* Retrieve the base character. */
|
|
movl 0(%edx), %edx
|
|
pusha
|
|
movb EXT_C(grub_console_cur_color), %bl
|
|
|
|
call prot_to_real
|
|
.code16
|
|
movb %dl, %al
|
|
xorb %bh, %bh
|
|
|
|
/* use teletype output if control character */
|
|
cmpb $0x7, %al
|
|
je 1f
|
|
cmpb $0x8, %al
|
|
je 1f
|
|
cmpb $0xa, %al
|
|
je 1f
|
|
cmpb $0xd, %al
|
|
je 1f
|
|
|
|
/* save the character and the attribute on the stack */
|
|
pushw %ax
|
|
pushw %bx
|
|
|
|
/* get the current position */
|
|
movb $0x3, %ah
|
|
int $0x10
|
|
|
|
/* check the column with the width */
|
|
cmpb $79, %dl
|
|
jl 2f
|
|
|
|
/* print CR and LF, if next write will exceed the width */
|
|
movw $0x0e0d, %ax
|
|
int $0x10
|
|
movb $0x0a, %al
|
|
int $0x10
|
|
|
|
/* get the current position */
|
|
movb $0x3, %ah
|
|
int $0x10
|
|
|
|
2:
|
|
/* restore the character and the attribute */
|
|
popw %bx
|
|
popw %ax
|
|
|
|
/* write the character with the attribute */
|
|
movb $0x9, %ah
|
|
movw $1, %cx
|
|
int $0x10
|
|
|
|
/* move the cursor forward */
|
|
incb %dl
|
|
movb $0x2, %ah
|
|
int $0x10
|
|
|
|
jmp 3f
|
|
|
|
1: movw $1, %bx
|
|
movb $0xe, %ah
|
|
int $0x10
|
|
|
|
3: DATA32 call real_to_prot
|
|
.code32
|
|
|
|
popa
|
|
ret
|
|
|
|
|
|
LOCAL(bypass_table):
|
|
.word 0x0100 | '\e',0x0f00 | '\t', 0x0e00 | '\b', 0x1c00 | '\r'
|
|
.word 0x1c00 | '\n'
|
|
LOCAL(bypass_table_end):
|
|
|
|
/*
|
|
* int grub_console_getkey (void)
|
|
* if there is a character pending, return it; otherwise return -1
|
|
* BIOS call "INT 16H Function 01H" to check whether a character is pending
|
|
* Call with %ah = 0x1
|
|
* Return:
|
|
* If key waiting to be input:
|
|
* %ah = keyboard scan code
|
|
* %al = ASCII character
|
|
* Zero flag = clear
|
|
* else
|
|
* Zero flag = set
|
|
* BIOS call "INT 16H Function 00H" to read character from keyboard
|
|
* Call with %ah = 0x0
|
|
* Return: %ah = keyboard scan code
|
|
* %al = ASCII character
|
|
*/
|
|
|
|
FUNCTION(grub_console_getkey)
|
|
pushl %ebp
|
|
|
|
call prot_to_real
|
|
.code16
|
|
|
|
/*
|
|
* Due to a bug in apple's bootcamp implementation, INT 16/AH = 0 would
|
|
* cause the machine to hang at the second keystroke. However, we can
|
|
* work around this problem by ensuring the presence of keystroke with
|
|
* INT 16/AH = 1 before calling INT 16/AH = 0.
|
|
*/
|
|
|
|
movb $1, %ah
|
|
int $0x16
|
|
jz notpending
|
|
|
|
movb $0, %ah
|
|
int $0x16
|
|
|
|
xorl %edx, %edx
|
|
movw %ax, %dx /* real_to_prot uses %eax */
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movl $0xff, %eax
|
|
testl %eax, %edx
|
|
jz 1f
|
|
|
|
andl %edx, %eax
|
|
cmp %eax, 0x20
|
|
ja 2f
|
|
movl %edx, %eax
|
|
leal LOCAL(bypass_table), %esi
|
|
movl $((LOCAL(bypass_table_end) - LOCAL(bypass_table)) / 2), %ecx
|
|
repne cmpsw
|
|
jz 3f
|
|
|
|
addl $('a' - 1 | GRUB_TERM_CTRL), %eax
|
|
jmp 2f
|
|
3:
|
|
andl $0xff, %eax
|
|
jmp 2f
|
|
|
|
1: movl %edx, %eax
|
|
shrl $8, %eax
|
|
orl $GRUB_TERM_EXTENDED, %eax
|
|
2:
|
|
popl %ebp
|
|
ret
|
|
|
|
notpending:
|
|
.code16
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
#if GRUB_TERM_NO_KEY != -1
|
|
#error Fix this asm code
|
|
#endif
|
|
decl %eax
|
|
jmp 2b
|
|
|
|
|
|
/*
|
|
* grub_uint16_t grub_console_getxy (void)
|
|
* BIOS call "INT 10H Function 03h" to get cursor position
|
|
* Call with %ah = 0x03
|
|
* %bh = page
|
|
* Returns %ch = starting scan line
|
|
* %cl = ending scan line
|
|
* %dh = row (0 is top)
|
|
* %dl = column (0 is left)
|
|
*/
|
|
|
|
|
|
FUNCTION(grub_console_getxy)
|
|
pushl %ebp
|
|
pushl %ebx /* save EBX */
|
|
|
|
call prot_to_real
|
|
.code16
|
|
|
|
xorb %bh, %bh /* set page to 0 */
|
|
movb $0x3, %ah
|
|
int $0x10 /* get cursor position */
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movb %dl, %ah
|
|
movb %dh, %al
|
|
|
|
popl %ebx
|
|
popl %ebp
|
|
ret
|
|
|
|
|
|
/*
|
|
* void grub_console_gotoxy(grub_uint8_t x, grub_uint8_t y)
|
|
* BIOS call "INT 10H Function 02h" to set cursor position
|
|
* Call with %ah = 0x02
|
|
* %bh = page
|
|
* %dh = row (0 is top)
|
|
* %dl = column (0 is left)
|
|
*/
|
|
|
|
|
|
FUNCTION(grub_console_gotoxy)
|
|
pushl %ebp
|
|
pushl %ebx /* save EBX */
|
|
|
|
movb %cl, %dh /* %dh = y */
|
|
/* %dl = x */
|
|
|
|
call prot_to_real
|
|
.code16
|
|
|
|
xorb %bh, %bh /* set page to 0 */
|
|
movb $0x2, %ah
|
|
int $0x10 /* set cursor position */
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
popl %ebx
|
|
popl %ebp
|
|
ret
|
|
|
|
|
|
/*
|
|
* void grub_console_cls (void)
|
|
* BIOS call "INT 10H Function 09h" to write character and attribute
|
|
* Call with %ah = 0x09
|
|
* %al = (character)
|
|
* %bh = (page number)
|
|
* %bl = (attribute)
|
|
* %cx = (number of times)
|
|
*/
|
|
|
|
FUNCTION(grub_console_cls)
|
|
pushl %ebp
|
|
pushl %ebx /* save EBX */
|
|
|
|
call prot_to_real
|
|
.code16
|
|
|
|
/* move the cursor to the beginning */
|
|
movb $0x02, %ah
|
|
xorb %bh, %bh
|
|
xorw %dx, %dx
|
|
int $0x10
|
|
|
|
/* write spaces to the entire screen */
|
|
movw $0x0920, %ax
|
|
movw $0x07, %bx
|
|
movw $(80 * 25), %cx
|
|
int $0x10
|
|
|
|
/* move back the cursor */
|
|
movb $0x02, %ah
|
|
int $0x10
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
popl %ebx
|
|
popl %ebp
|
|
ret
|
|
|
|
|
|
/*
|
|
* void grub_console_setcursor (int on)
|
|
* BIOS call "INT 10H Function 01h" to set cursor type
|
|
* Call with %ah = 0x01
|
|
* %ch = cursor starting scanline
|
|
* %cl = cursor ending scanline
|
|
*/
|
|
|
|
console_cursor_state:
|
|
.byte 1
|
|
console_cursor_shape:
|
|
.word 0
|
|
|
|
FUNCTION(grub_console_setcursor)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
|
|
/* push ON */
|
|
pushl %edx
|
|
|
|
/* check if the standard cursor shape has already been saved */
|
|
movw console_cursor_shape, %ax
|
|
testw %ax, %ax
|
|
jne 1f
|
|
|
|
call prot_to_real
|
|
.code16
|
|
|
|
movb $0x03, %ah
|
|
xorb %bh, %bh
|
|
int $0x10
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movw %cx, console_cursor_shape
|
|
1:
|
|
/* set %cx to the designated cursor shape */
|
|
movw $0x2000, %cx
|
|
popl %eax
|
|
testl %eax, %eax
|
|
jz 2f
|
|
movw console_cursor_shape, %cx
|
|
2:
|
|
call prot_to_real
|
|
.code16
|
|
|
|
movb $0x1, %ah
|
|
int $0x10
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
popl %ebx
|
|
popl %ebp
|
|
ret
|
|
|
|
/*
|
|
* grub_get_rtc()
|
|
* return the real time in ticks, of which there are about
|
|
* 18-20 per second
|
|
*/
|
|
FUNCTION(grub_get_rtc)
|
|
pushl %ebp
|
|
|
|
call prot_to_real /* enter real mode */
|
|
.code16
|
|
|
|
/* %ax is already zero */
|
|
int $0x1a
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movl %ecx, %eax
|
|
shll $16, %eax
|
|
movw %dx, %ax
|
|
|
|
popl %ebp
|
|
ret
|
|
|
|
|
|
/*
|
|
* unsigned char grub_vga_set_mode (unsigned char mode)
|
|
*/
|
|
FUNCTION(grub_vga_set_mode)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
movl %eax, %ecx
|
|
|
|
call prot_to_real
|
|
.code16
|
|
/* get current mode */
|
|
xorw %bx, %bx
|
|
movb $0x0f, %ah
|
|
int $0x10
|
|
movb %al, %dl
|
|
|
|
/* set the new mode */
|
|
movb %cl, %al
|
|
xorb %ah, %ah
|
|
int $0x10
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movb %dl, %al
|
|
popl %ebx
|
|
popl %ebp
|
|
ret
|
|
|
|
/*
|
|
* grub_vbe_bios_status_t grub_vbe_get_controller_info (struct grub_vbe_info_block *controller_info)
|
|
*
|
|
* Register allocations for parameters:
|
|
* %eax *controller_info
|
|
*/
|
|
FUNCTION(grub_vbe_bios_get_controller_info)
|
|
pushl %ebp
|
|
pushl %edi
|
|
pushl %edx
|
|
|
|
movw %ax, %di /* Store *controller_info to %edx:%di. */
|
|
xorw %ax, %ax
|
|
shrl $4, %eax
|
|
mov %eax, %edx /* prot_to_real destroys %eax. */
|
|
|
|
call prot_to_real
|
|
.code16
|
|
|
|
pushw %es
|
|
|
|
movw %dx, %es /* *controller_info is now on %es:%di. */
|
|
movw $0x4f00, %ax
|
|
int $0x10
|
|
|
|
movw %ax, %dx /* real_to_prot destroys %eax. */
|
|
|
|
popw %es
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movl %edx, %eax
|
|
andl $0x0FFFF, %eax /* Return value in %eax. */
|
|
|
|
pop %edx
|
|
popl %edi
|
|
popl %ebp
|
|
ret
|
|
|
|
/*
|
|
* grub_vbe_status_t grub_vbe_bios_get_mode_info (grub_uint32_t mode,
|
|
* struct grub_vbe_mode_info_block *mode_info)
|
|
*
|
|
* Register allocations for parameters:
|
|
* %eax mode
|
|
* %edx *mode_info
|
|
*/
|
|
FUNCTION(grub_vbe_bios_get_mode_info)
|
|
pushl %ebp
|
|
pushl %edi
|
|
|
|
movl %eax, %ecx /* Store mode number to %ecx. */
|
|
|
|
movw %dx, %di /* Store *mode_info to %edx:%di. */
|
|
xorw %dx, %dx
|
|
shrl $4, %edx
|
|
|
|
call prot_to_real
|
|
.code16
|
|
|
|
pushw %es
|
|
|
|
movw %dx, %es /* *mode_info is now on %es:%di. */
|
|
movw $0x4f01, %ax
|
|
int $0x10
|
|
|
|
movw %ax, %dx /* real_to_prot destroys %eax. */
|
|
|
|
popw %es
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movl %edx, %eax
|
|
andl $0x0FFFF, %eax /* Return value in %eax. */
|
|
|
|
popl %edi
|
|
popl %ebp
|
|
ret
|
|
|
|
/*
|
|
* grub_vbe_status_t grub_vbe_bios_set_mode (grub_uint32_t mode,
|
|
* struct grub_vbe_crtc_info_block *crtc_info)
|
|
*
|
|
* Register allocations for parameters:
|
|
* %eax mode
|
|
* %edx *crtc_info
|
|
*/
|
|
FUNCTION(grub_vbe_bios_set_mode)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
pushl %edi
|
|
|
|
movl %eax, %ebx /* Store mode in %ebx. */
|
|
|
|
movw %dx, %di /* Store *crtc_info to %edx:%di. */
|
|
xorw %dx, %dx
|
|
shrl $4, %edx
|
|
|
|
call prot_to_real
|
|
.code16
|
|
|
|
pushw %es
|
|
|
|
movw %dx, %es /* *crtc_info is now on %es:%di. */
|
|
|
|
movw $0x4f02, %ax
|
|
int $0x10
|
|
|
|
movw %ax, %dx /* real_to_prot destroys %eax. */
|
|
|
|
popw %es
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movw %dx, %ax
|
|
andl $0xFFFF, %eax /* Return value in %eax. */
|
|
|
|
popl %edi
|
|
popl %ebx
|
|
popl %ebp
|
|
ret
|
|
|
|
/*
|
|
* grub_vbe_status_t grub_vbe_bios_get_mode (grub_uint32_t *mode)
|
|
*
|
|
* Register allocations for parameters:
|
|
* %eax *mode
|
|
*/
|
|
FUNCTION(grub_vbe_bios_get_mode)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
pushl %edi
|
|
pushl %edx
|
|
pushl %eax /* Push *mode to stack. */
|
|
|
|
call prot_to_real
|
|
.code16
|
|
|
|
movw $0x4f03, %ax
|
|
int $0x10
|
|
|
|
movw %ax, %dx /* real_to_prot destroys %eax. */
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
popl %edi /* Pops *mode from stack to %edi. */
|
|
andl $0xFFFF, %ebx
|
|
movl %ebx, (%edi)
|
|
|
|
movw %dx, %ax
|
|
andl $0xFFFF, %eax /* Return value in %eax. */
|
|
|
|
popl %edx
|
|
popl %edi
|
|
popl %ebx
|
|
popl %ebp
|
|
ret
|
|
|
|
/*
|
|
* grub_vbe_status_t grub_vbe_bios_getset_dac_palette_width (int set, int *dac_mask_size)
|
|
*
|
|
* Register allocations for parameters:
|
|
* %eax set
|
|
* %edx *dac_mask_size
|
|
*/
|
|
FUNCTION(grub_vbe_bios_getset_dac_palette_width)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
|
|
xorl %ebx, %ebx
|
|
|
|
/* If we only want to fetch the value, set %bl to 1. */
|
|
testl %eax, %eax
|
|
jne 1f
|
|
incb %bl
|
|
1:
|
|
|
|
/* Put desired width in %bh. */
|
|
movl (%edx), %eax
|
|
movb %al, %bh
|
|
|
|
call prot_to_real
|
|
.code16
|
|
|
|
movw $0x4f08, %ax
|
|
int $0x10
|
|
|
|
movw %ax, %cx /* real_to_prot destroys %eax. */
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
/* Move result back to *dac_mask_size. */
|
|
xorl %eax, %eax
|
|
movb %bh, %al
|
|
movl %eax, (%edx)
|
|
|
|
/* Return value in %eax. */
|
|
movw %cx, %ax
|
|
|
|
popl %ebx
|
|
popl %ebp
|
|
ret
|
|
|
|
/*
|
|
* grub_vbe_status_t grub_vbe_bios_set_memory_window (grub_uint32_t window,
|
|
* grub_uint32_t position);
|
|
*
|
|
* Register allocations for parameters:
|
|
* %eax window
|
|
* %edx position
|
|
*/
|
|
FUNCTION(grub_vbe_bios_set_memory_window)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
|
|
movl %eax, %ebx
|
|
|
|
call prot_to_real
|
|
.code16
|
|
|
|
movw $0x4f05, %ax
|
|
andw $0x00ff, %bx /* BL = window, BH = 0, Set memory window. */
|
|
int $0x10
|
|
|
|
movw %ax, %dx /* real_to_prot destroys %eax. */
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movw %dx, %ax
|
|
andl $0xFFFF, %eax /* Return value in %eax. */
|
|
|
|
popl %ebx
|
|
popl %ebp
|
|
ret
|
|
|
|
/*
|
|
* grub_vbe_status_t grub_vbe_bios_get_memory_window (grub_uint32_t window,
|
|
* grub_uint32_t *position);
|
|
*
|
|
* Register allocations for parameters:
|
|
* %eax window
|
|
* %edx *position
|
|
*/
|
|
FUNCTION(grub_vbe_bios_get_memory_window)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
pushl %edi
|
|
pushl %edx /* Push *position to stack. */
|
|
|
|
movl %eax, %ebx /* Store window in %ebx. */
|
|
|
|
call prot_to_real
|
|
.code16
|
|
|
|
movw $0x4f05, %ax
|
|
andw $0x00ff, %bx /* BL = window. */
|
|
orw $0x0100, %bx /* BH = 1, Get memory window. */
|
|
int $0x10
|
|
|
|
movw %ax, %bx /* real_to_prot destroys %eax. */
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
popl %edi /* pops *position from stack to %edi. */
|
|
andl $0xFFFF, %edx
|
|
movl %edx, (%edi) /* Return position to caller. */
|
|
|
|
movw %bx, %ax
|
|
andl $0xFFFF, %eax /* Return value in %eax. */
|
|
|
|
popl %edi
|
|
popl %ebx
|
|
popl %ebp
|
|
ret
|
|
|
|
/*
|
|
* grub_vbe_status_t grub_vbe_bios_set_scanline_length (grub_uint32_t length)
|
|
*
|
|
* Register allocations for parameters:
|
|
* %eax length
|
|
*/
|
|
FUNCTION(grub_vbe_bios_set_scanline_length)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
pushl %edx
|
|
|
|
movl %eax, %ecx /* Store length in %ecx. */
|
|
|
|
call prot_to_real
|
|
.code16
|
|
|
|
movw $0x4f06, %ax
|
|
movw $0x0002, %bx /* BL = 2, Set Scan Line in Bytes. */
|
|
int $0x10
|
|
|
|
movw %ax, %dx /* real_to_prot destroys %eax. */
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movw %dx, %ax
|
|
andl $0xFFFF, %eax /* Return value in %eax. */
|
|
|
|
popl %edx
|
|
popl %ebx
|
|
popl %ebp
|
|
ret
|
|
|
|
/*
|
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* grub_vbe_status_t grub_vbe_bios_get_scanline_length (grub_uint32_t *length)
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*
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* Register allocations for parameters:
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* %eax *length
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*/
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FUNCTION(grub_vbe_bios_get_scanline_length)
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pushl %ebp
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pushl %ebx
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pushl %edi
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pushl %edx /* Push *length to stack. */
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call prot_to_real
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.code16
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movw $0x4f06, %ax
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movw $0x0001, %bx /* BL = 1, Get Scan Line Length (in bytes). */
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int $0x10
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movw %ax, %dx /* real_to_prot destroys %eax. */
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DATA32 call real_to_prot
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.code32
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popl %edi /* Pops *length from stack to %edi. */
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andl $0xFFFF, %ebx
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movl %ebx, (%edi) /* Return length to caller. */
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movw %dx, %ax
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andl $0xFFFF, %eax /* Return value in %eax. */
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popl %edi
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popl %ebx
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popl %ebp
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ret
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/*
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* grub_vbe_status_t grub_vbe_bios_set_display_start (grub_uint32_t x,
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* grub_uint32_t y)
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*
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* Register allocations for parameters:
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* %eax x
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* %edx y
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*/
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FUNCTION(grub_vbe_bios_set_display_start)
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pushl %ebp
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pushl %ebx
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movl %eax, %ecx /* Store x in %ecx. */
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call prot_to_real
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.code16
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movw $0x4f07, %ax
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movw $0x0080, %bx /* BL = 80h, Set Display Start
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during Vertical Retrace. */
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int $0x10
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movw %ax, %dx /* real_to_prot destroys %eax. */
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DATA32 call real_to_prot
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.code32
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movw %dx, %ax
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andl $0xFFFF, %eax /* Return value in %eax. */
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popl %ebx
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popl %ebp
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ret
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/*
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* grub_vbe_status_t grub_vbe_bios_get_display_start (grub_uint32_t *x,
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* grub_uint32_t *y)
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*
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* Register allocations for parameters:
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* %eax *x
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* %edx *y
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*/
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FUNCTION(grub_vbe_bios_get_display_start)
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pushl %ebp
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pushl %ebx
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pushl %edi
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pushl %eax /* Push *x to stack. */
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pushl %edx /* Push *y to stack. */
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call prot_to_real
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.code16
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movw $0x4f07, %ax
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movw $0x0001, %bx /* BL = 1, Get Display Start. */
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int $0x10
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movw %ax, %bx /* real_to_prot destroys %eax. */
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DATA32 call real_to_prot
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.code32
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popl %edi /* Pops *y from stack to %edi. */
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andl $0xFFFF, %edx
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movl %edx, (%edi) /* Return y-position to caller. */
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popl %edi /* Pops *x from stack to %edi. */
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andl $0xFFFF, %ecx
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movl %ecx, (%edi) /* Return x-position to caller. */
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movw %bx, %ax
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andl $0xFFFF, %eax /* Return value in %eax. */
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popl %edi
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popl %ebx
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popl %ebp
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ret
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/*
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* grub_vbe_status_t grub_vbe_bios_set_palette_data (grub_uint32_t color_count,
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* grub_uint32_t start_index,
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* struct grub_vbe_palette_data *palette_data)
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*
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* Register allocations for parameters:
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* %eax color_count
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* %edx start_index
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* %ecx *palette_data
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*/
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FUNCTION(grub_vbe_bios_set_palette_data)
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pushl %ebp
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pushl %ebx
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pushl %edi
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movl %eax, %ebx /* Store color_count in %ebx. */
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movw %cx, %di /* Store *palette_data to %ecx:%di. */
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xorw %cx, %cx
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shrl $4, %ecx
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call prot_to_real
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.code16
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pushw %es
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movw %cx, %es /* *palette_data is now on %es:%di. */
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movw %bx, %cx /* color_count is now on %cx. */
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movw $0x4f09, %ax
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xorw %bx, %bx /* BL = 0, Set Palette Data. */
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int $0x10
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movw %ax, %dx /* real_to_prot destroys %eax. */
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popw %es
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DATA32 call real_to_prot
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.code32
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movw %dx, %ax
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andl $0xFFFF, %eax /* Return value in %eax. */
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popl %edi
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popl %ebx
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popl %ebp
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ret
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pxe_rm_entry:
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.long 0
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/*
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* struct grub_pxenv *grub_pxe_scan (void);
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*/
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FUNCTION(grub_pxe_scan)
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pushl %ebp
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pushl %ebx
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xorl %ebx, %ebx
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xorl %ecx, %ecx
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call prot_to_real
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.code16
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pushw %es
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movw $0x5650, %ax
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int $0x1A
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cmpw $0x564E, %ax
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jnz 1f
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cmpl $0x4E455850, %es:(%bx) /* PXEN(V+) */
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jnz 1f
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cmpw $0x201, %es:6(%bx) /* API version */
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jb 1f
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lesw %es:0x28(%bx), %bx /* !PXE structure */
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cmpl $0x45585021, %es:(%bx) /* !PXE */
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jnz 1f
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movw %es, %cx
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jmp 2f
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1:
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xorw %bx, %bx
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xorw %cx, %cx
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2:
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popw %es
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DATA32 call real_to_prot
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.code32
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xorl %eax, %eax
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leal (%eax, %ecx, 4), %ecx
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leal (%ebx, %ecx, 4), %eax /* eax = ecx * 16 + ebx */
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orl %eax, %eax
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jz 1f
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movl 0x10(%eax), %ecx
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movl %ecx, pxe_rm_entry
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1:
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popl %ebx
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popl %ebp
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ret
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/*
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* int grub_pxe_call (int func, void* data);
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*/
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FUNCTION(grub_pxe_call)
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pushl %ebp
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movl %esp, %ebp
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pushl %esi
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pushl %edi
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pushl %ebx
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movl %eax, %ecx
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movl %edx, %eax
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andl $0xF, %eax
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shrl $4, %edx
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shll $16, %edx
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addl %eax, %edx
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movl pxe_rm_entry, %ebx
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|
|
call prot_to_real
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|
.code16
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pushl %ebx
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pushl %edx
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pushw %cx
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movw %sp, %bx
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lcall *%ss:6(%bx)
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cld
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|
addw $10, %sp
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|
movw %ax, %cx
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|
|
DATA32 call real_to_prot
|
|
.code32
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|
|
|
movzwl %cx, %eax
|
|
|
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popl %ebx
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popl %edi
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|
popl %esi
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popl %ebp
|
|
ret
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