8367695cff
* genkernsyms.sh: Updated copyright information. * genmk.rb: Likewise. * genmodsrc.sh: Likewise. * gensymlist.sh: Likewise. * boot/i386/pc/boot.S: Likewise. * boot/i386/pc/diskboot.S: Likewise. * disk/i386/pc/biosdisk.c: Likewise. * disk/i386/pc/partition.c: Likewise. * font/manager.c: Likewise. * fs/ext2.c: Likewise. * fs/fat.c: Likewise. * include/pupa/boot.h: Likewise. * include/pupa/device.h: Likewise. * include/pupa/disk.h: Likewise. * include/pupa/dl.h: Likewise. * include/pupa/elf.h: Likewise. * include/pupa/err.h: Likewise. * include/pupa/file.h: Likewise. * include/pupa/font.h: Likewise. * include/pupa/fs.h: Likewise. * include/pupa/kernel.h: Likewise. * include/pupa/loader.h: Likewise. * include/pupa/misc.h: Likewise. * include/pupa/mm.h: Likewise. * include/pupa/net.h: Likewise. * include/pupa/normal.h: Likewise. * include/pupa/rescue.h: Likewise. * include/pupa/setjmp.h: Likewise. * include/pupa/symbol.h: Likewise. * include/pupa/term.h: Likewise. * include/pupa/types.h: Likewise. * include/pupa/i386/setjmp.h: Likewise. * include/pupa/i386/types.h: Likewise. * include/pupa/i386/pc/biosdisk.h: Likewise. * include/pupa/i386/pc/boot.h: Likewise. * include/pupa/i386/pc/console.h: Likewise. * include/pupa/i386/pc/init.h: Likewise. * include/pupa/i386/pc/kernel.h: Likewise. * include/pupa/i386/pc/linux.h: Likewise. * include/pupa/i386/pc/loader.h: Likewise. * include/pupa/i386/pc/memory.h: Likewise. * include/pupa/i386/pc/multiboot.h: Likewise. * include/pupa/i386/pc/partition.h: Likewise. * include/pupa/i386/pc/time.h: Likewise. * include/pupa/i386/pc/vga.h: Likewise. * include/pupa/i386/pc/util/biosdisk.h: Likewise. * include/pupa/util/getroot.h: Likewise. * include/pupa/util/misc.h: Likewise. * include/pupa/util/resolve.h: Likewise. * kern/device.c: Likewise. * kern/disk.c: Likewise. * kern/dl.c: Likewise. * kern/err.c: Likewise. * kern/file.c: Likewise. * kern/fs.c: Likewise. * kern/loader.c: Likewise. * kern/main.c: Likewise. * kern/misc.c: Likewise. * kern/mm.c: Likewise. * kern/rescue.c: Likewise. * kern/term.c: Likewise. * kern/i386/dl.c: Likewise. * kern/i386/pc/init.c: Likewise. * kern/i386/pc/lzo1x.S: Likewise. * kern/i386/pc/startup.S: Likewise. * loader/i386/pc/chainloader.c: Likewise. * loader/i386/pc/linux.c: Likewise. * loader/i386/pc/multiboot.c: Likewise. * normal/cmdline.c: Likewise. * normal/command.c: Likewise. * normal/main.c: Likewise. * normal/menu.c: Likewise. * normal/i386/setjmp.S: Likewise. * term/i386/pc/console.c: Likewise. * term/i386/pc/vga.c: Likewise. * util/console.c: Likewise. * util/genmoddep.c: Likewise. * util/misc.c: Likewise. * util/pupa-emu.c: Likewise. * util/resolve.c: Likewise. * util/unifont2pff.rb: Likewise. * util/i386/pc/biosdisk.c: Likewise. * util/i386/pc/getroot.c: Likewise. * util/i386/pc/pupa-mkimage.c: Likewise. * util/i386/pc/pupa-setup.c: Likewise.
1596 lines
29 KiB
ArmAsm
1596 lines
29 KiB
ArmAsm
/*
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* PUPA -- Preliminary Universal Programming Architecture for GRUB
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* Copyright (C) 1999,2000,2001,2002,2003 Free Software Foundation, Inc.
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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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: PUPA 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 if 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 <pupa/symbol.h>
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#include <pupa/boot.h>
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#include <pupa/machine/boot.h>
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#include <pupa/machine/memory.h>
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#include <pupa/machine/console.h>
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#include <pupa/machine/linux.h>
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#include <pupa/machine/kernel.h>
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#include <pupa/machine/multiboot.h>
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#define ABS(x) ((x) - EXT_C(start) + PUPA_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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/*
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* Guarantee that "main" is loaded at 0x0:0x8200.
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*/
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ljmp $0, $ABS(codestart)
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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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. = EXT_C(start) + 0x6
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.byte PUPA_BOOT_VERSION_MAJOR, PUPA_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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. = EXT_C(start) + 0x8
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VARIABLE(pupa_total_module_size)
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.long 0
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VARIABLE(pupa_kernel_image_size)
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.long 0
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VARIABLE(pupa_compressed_size)
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.long 0
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VARIABLE(pupa_install_dos_part)
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.long 0xFFFFFFFF
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VARIABLE(pupa_install_bsd_part)
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.long 0xFFFFFFFF
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VARIABLE(pupa_prefix)
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.string "/boot/pupa"
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/*
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* Leave some breathing room for the prefix.
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*/
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. = EXT_C(start) + 0x50
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/* the real mode code continues... */
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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 $PUPA_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 boot drive reference */
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ADDR32 movb %dl, EXT_C(pupa_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(pupa_gate_a20)
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/* decompress the compressed part and put the result at 1MB */
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movl $0x100000, %esi
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movl $(START_SYMBOL + PUPA_KERNEL_MACHINE_RAW_SIZE), %edi
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pushl %esi
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pushl EXT_C(pupa_compressed_size)
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pushl %edi
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call lzo1x_decompress
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addl $12, %esp
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/* copy back the decompressed part */
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movl %eax, %ecx
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cld
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rep
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movsb
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/* copy modules before cleaning out the bss */
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movl EXT_C(pupa_total_module_size), %ecx
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movl EXT_C(pupa_kernel_image_size), %esi
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addl %ecx, %esi
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addl $START_SYMBOL, %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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/* 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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/* 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(pupa_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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.p2align 2 /* force 4-byte alignment */
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protstack:
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.long PUPA_MEMORY_MACHINE_PROT_STACK
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VARIABLE(pupa_boot_drive)
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.long 0
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VARIABLE(pupa_start_addr)
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.long START_SYMBOL
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VARIABLE(pupa_end_addr)
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.long END_SYMBOL
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VARIABLE(pupa_apm_bios_info)
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.word 0 /* version */
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.word 0 /* cseg */
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.long 0 /* offset */
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.word 0 /* cseg_16 */
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.word 0 /* dseg_16 */
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.word 0 /* cseg_len */
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.word 0 /* cseg_16_len */
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.word 0 /* dseg_16_len */
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/*
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* This is the Global Descriptor Table
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*
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* An entry, a "Segment Descriptor", looks like this:
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*
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* 31 24 19 16 7 0
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* ------------------------------------------------------------
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* | | |B| |A| | | |1|0|E|W|A| |
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* | BASE 31..24 |G|/|0|V| LIMIT |P|DPL| TYPE | BASE 23:16 |
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* | | |D| |L| 19..16| | |1|1|C|R|A| |
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* ------------------------------------------------------------
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* | | |
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* | BASE 15..0 | LIMIT 15..0 |
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* | | |
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* ------------------------------------------------------------
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*
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* Note the ordering of the data items is reversed from the above
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* description.
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*/
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.p2align 2 /* force 4-byte alignment */
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gdt:
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.word 0, 0
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.byte 0, 0, 0, 0
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/* code segment */
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.word 0xFFFF, 0
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.byte 0, 0x9A, 0xCF, 0
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/* data segment */
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.word 0xFFFF, 0
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.byte 0, 0x92, 0xCF, 0
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/* 16 bit real mode CS */
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.word 0xFFFF, 0
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.byte 0, 0x9E, 0, 0
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/* 16 bit real mode DS */
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.word 0xFFFF, 0
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.byte 0, 0x92, 0, 0
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/* this is the GDT descriptor */
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gdtdesc:
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.word 0x27 /* limit */
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.long gdt /* addr */
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/*
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* These next two routines, "real_to_prot" and "prot_to_real" are structured
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* in a very specific way. Be very careful when changing them.
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*
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* NOTE: Use of either one messes up %eax and %ebp.
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*/
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real_to_prot:
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.code16
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cli
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/* load the GDT register */
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DATA32 ADDR32 lgdt gdtdesc
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/* turn on protected mode */
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movl %cr0, %eax
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orl $PUPA_MEMORY_MACHINE_CR0_PE_ON, %eax
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movl %eax, %cr0
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/* jump to relocation, flush prefetch queue, and reload %cs */
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DATA32 ljmp $PUPA_MEMORY_MACHINE_PROT_MODE_CSEG, $protcseg
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.code32
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protcseg:
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/* reload other segment registers */
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movw $PUPA_MEMORY_MACHINE_PROT_MODE_DSEG, %ax
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %fs
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movw %ax, %gs
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movw %ax, %ss
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/* put the return address in a known safe location */
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movl (%esp), %eax
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movl %eax, PUPA_MEMORY_MACHINE_REAL_STACK
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/* get protected mode stack */
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movl protstack, %eax
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movl %eax, %esp
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movl %eax, %ebp
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/* get return address onto the right stack */
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movl PUPA_MEMORY_MACHINE_REAL_STACK, %eax
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movl %eax, (%esp)
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/* zero %eax */
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xorl %eax, %eax
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/* return on the old (or initialized) stack! */
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ret
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prot_to_real:
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/* just in case, set GDT */
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lgdt gdtdesc
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/* save the protected mode stack */
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movl %esp, %eax
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movl %eax, protstack
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/* get the return address */
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movl (%esp), %eax
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movl %eax, PUPA_MEMORY_MACHINE_REAL_STACK
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/* set up new stack */
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movl $PUPA_MEMORY_MACHINE_REAL_STACK, %eax
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movl %eax, %esp
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movl %eax, %ebp
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/* set up segment limits */
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movw $PUPA_MEMORY_MACHINE_PSEUDO_REAL_DSEG, %ax
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %fs
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movw %ax, %gs
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movw %ax, %ss
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/* this might be an extra step */
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/* jump to a 16 bit segment */
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ljmp $PUPA_MEMORY_MACHINE_PSEUDO_REAL_CSEG, $tmpcseg
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tmpcseg:
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.code16
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/* clear the PE bit of CR0 */
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movl %cr0, %eax
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andl $(~PUPA_MEMORY_MACHINE_CR0_PE_ON), %eax
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movl %eax, %cr0
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/* flush prefetch queue, reload %cs */
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DATA32 ljmp $0, $realcseg
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realcseg:
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/* we are in real mode now
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* set up the real mode segment registers : DS, SS, ES
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*/
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/* zero %eax */
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xorl %eax, %eax
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %fs
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movw %ax, %gs
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movw %ax, %ss
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/* restore interrupts */
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sti
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/* return on new stack! */
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DATA32 ret
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.code32
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/*
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* pupa_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(pupa_gate_a20)
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movl %eax, %ecx
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call gloop1
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movb $0xd1, %al
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outb $0x64
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gloopint1:
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inb $0x64
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andb $0x02, %al
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jnz gloopint1
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movb $0xdd, %al
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testl %ecx, %ecx
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jz gdoit
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orb $0x02, %al
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gdoit:
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outb $0x60
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call gloop1
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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 gloop1
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ret
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gloop1:
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inb $0x64
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andb $0x02, %al
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jnz gloop1
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gloop2:
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inb $0x64
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andb $0x01, %al
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jz gloop2ret
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inb $0x60
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jmp gloop2
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gloop2ret:
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ret
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#include "lzo1x.S"
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|
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/*
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* This call is special... it never returns... in fact it should simply
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* hang at this point!
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*/
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FUNCTION(pupa_stop)
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call prot_to_real
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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(pupa_hard_stop)
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hlt
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jmp EXT_C(pupa_hard_stop)
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|
|
|
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/*
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* pupa_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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FUNCTION(pupa_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
|
|
|
|
/*
|
|
* pupa_reboot()
|
|
*
|
|
* Reboot the system. At the moment, rely on BIOS.
|
|
*/
|
|
FUNCTION(pupa_reboot)
|
|
call prot_to_real
|
|
.code16
|
|
/* cold boot */
|
|
movw $0x0472, %di
|
|
movw %ax, (%di)
|
|
ljmp $0xFFFF, $0x0000
|
|
.code32
|
|
|
|
/*
|
|
* pupa_halt(int no_apm)
|
|
*
|
|
* Halt the system, using APM if possible. If NO_APM is true, don't use
|
|
* APM even if it is available.
|
|
*/
|
|
FUNCTION(pupa_halt)
|
|
/* see if zero */
|
|
testl %eax, %eax
|
|
jnz EXT_C(pupa_stop)
|
|
|
|
call prot_to_real
|
|
.code16
|
|
|
|
/* detect APM */
|
|
movw $0x5300, %ax
|
|
xorw %bx, %bx
|
|
int $0x15
|
|
jc EXT_C(pupa_hard_stop)
|
|
/* don't check %bx for buggy BIOSes... */
|
|
|
|
/* disconnect APM first */
|
|
movw $0x5304, %ax
|
|
xorw %bx, %bx
|
|
int $0x15
|
|
|
|
/* connect APM */
|
|
movw $0x5301, %ax
|
|
xorw %bx, %bx
|
|
int $0x15
|
|
jc EXT_C(pupa_hard_stop)
|
|
|
|
/* set APM protocol level - 1.1 or bust. (this covers APM 1.2 also) */
|
|
movw $0x530E, %ax
|
|
xorw %bx, %bx
|
|
movw $0x0101, %cx
|
|
int $0x15
|
|
jc EXT_C(pupa_hard_stop)
|
|
|
|
/* set the power state to off */
|
|
movw $0x5307, %ax
|
|
movw $1, %bx
|
|
movw $3, %cx
|
|
int $0x15
|
|
|
|
/* shouldn't reach here */
|
|
jmp EXT_C(pupa_hard_stop)
|
|
.code32
|
|
|
|
|
|
/*
|
|
* void pupa_chainloader_real_boot (int drive, void *part_addr)
|
|
*
|
|
* This starts another boot loader.
|
|
*/
|
|
|
|
FUNCTION(pupa_chainloader_real_boot)
|
|
pushl %edx
|
|
pushl %eax
|
|
|
|
call EXT_C(pupa_dl_unload_all)
|
|
|
|
/* set up to pass boot drive */
|
|
popl %edx
|
|
|
|
/* ESI must point to a partition table entry */
|
|
popl %esi
|
|
|
|
/* Turn off Gate A20 */
|
|
xorl %eax, %eax
|
|
call EXT_C(pupa_gate_a20)
|
|
|
|
call prot_to_real
|
|
.code16
|
|
ljmp $0, $PUPA_MEMORY_MACHINE_BOOT_LOADER_ADDR
|
|
.code32
|
|
|
|
|
|
/*
|
|
* void pupa_linux_boot_zimage (void)
|
|
*/
|
|
VARIABLE(pupa_linux_prot_size)
|
|
.long 0
|
|
VARIABLE(pupa_linux_tmp_addr)
|
|
.long 0
|
|
VARIABLE(pupa_linux_real_addr)
|
|
.long 0
|
|
|
|
FUNCTION(pupa_linux_boot_zimage)
|
|
/* copy the kernel */
|
|
movl EXT_C(pupa_linux_prot_size), %ecx
|
|
addl $3, %ecx
|
|
shrl $2, %ecx
|
|
movl $PUPA_LINUX_BZIMAGE_ADDR, %esi
|
|
movl $PUPA_LINUX_ZIMAGE_ADDR, %edi
|
|
cld
|
|
rep
|
|
movsl
|
|
|
|
FUNCTION(pupa_linux_boot_bzimage)
|
|
call EXT_C(pupa_dl_unload_all)
|
|
|
|
movl EXT_C(pupa_linux_real_addr), %ebx
|
|
|
|
/* copy the real mode code */
|
|
movl EXT_C(pupa_linux_tmp_addr), %esi
|
|
movl %ebx, %edi
|
|
movl $PUPA_LINUX_SETUP_MOVE_SIZE, %ecx
|
|
cld
|
|
rep
|
|
movsb
|
|
|
|
/* change %ebx to the segment address */
|
|
shrl $4, %ebx
|
|
movl %ebx, %eax
|
|
addl $0x20, %eax
|
|
movw %ax, linux_setup_seg
|
|
|
|
/* XXX new stack pointer in safe area for calling functions */
|
|
movl $0x4000, %esp
|
|
call EXT_C(pupa_stop_floppy)
|
|
|
|
/* final setup for linux boot */
|
|
call prot_to_real
|
|
.code16
|
|
|
|
cli
|
|
movw %bx, %ss
|
|
movw $PUPA_LINUX_SETUP_STACK, %sp
|
|
|
|
movw %bx, %ds
|
|
movw %bx, %es
|
|
movw %bx, %fs
|
|
movw %bx, %gs
|
|
|
|
/* ljmp */
|
|
.byte 0xea
|
|
.word 0
|
|
linux_setup_seg:
|
|
.word 0
|
|
.code32
|
|
|
|
|
|
/*
|
|
* This starts the multiboot kernel.
|
|
*/
|
|
|
|
FUNCTION(pupa_multiboot_real_boot)
|
|
/* Push the entry address on the stack. */
|
|
pushl %eax
|
|
/* Move the address of the multiboot information structure to ebx. */
|
|
movl %edx,%ebx
|
|
|
|
/* Unload all modules and stop the floppy driver. */
|
|
call EXT_C(pupa_dl_unload_all)
|
|
call EXT_C(pupa_stop_floppy)
|
|
|
|
/* Interrupts should be disabled. */
|
|
cli
|
|
|
|
/* Move the magic value into eax and jump to the kernel. */
|
|
movl $PUPA_MB_MAGIC2,%eax
|
|
popl %ecx
|
|
jmp *%ecx
|
|
|
|
|
|
/*
|
|
* int pupa_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(pupa_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 */
|
|
/* clear the data segment */
|
|
xorw %ax, %ax
|
|
movw %ax, %ds
|
|
/* back to protected mode */
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movb %dl, %al /* return value in %eax */
|
|
|
|
popl %esi
|
|
popl %ebp
|
|
|
|
ret
|
|
|
|
/*
|
|
* int pupa_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(pupa_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 pupa_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(pupa_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 pupa_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(pupa_biosdisk_get_diskinfo_int13_extensions)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
pushl %esi
|
|
|
|
/* compute the address of drive parameters */
|
|
movw %dx, %si
|
|
xorw %dx, %dx
|
|
shrl $4, %edx
|
|
movw %dx, %bx /* save the segment into %bx */
|
|
/* drive */
|
|
movb %al, %dl
|
|
/* enter real mode */
|
|
call prot_to_real
|
|
|
|
.code16
|
|
movb $0x48, %ah
|
|
movw %bx, %ds
|
|
int $0x13 /* do the operation */
|
|
movb %ah, %bl /* save return value in %bl */
|
|
/* clear the data segment */
|
|
xorw %ax, %ax
|
|
movw %ax, %ds
|
|
/* 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 pupa_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(pupa_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 */
|
|
/* 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 pupa_biosdisk_get_num_floppies (void)
|
|
*/
|
|
FUNCTION(pupa_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
|
|
|
|
|
|
/*
|
|
*
|
|
* pupa_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(pupa_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
|
|
|
|
|
|
/*
|
|
*
|
|
* pupa_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(pupa_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
|
|
|
|
/*
|
|
*
|
|
* pupa_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(pupa_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
|
|
|
|
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 pupa_console_real_putchar (int 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 OUPUT BIOS call doesn't
|
|
* support setting a background attribute.
|
|
*/
|
|
FUNCTION(pupa_console_real_putchar)
|
|
movl %eax, %edx
|
|
pusha
|
|
movb EXT_C(pupa_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
|
|
|
|
|
|
/*
|
|
* int pupa_console_getkey (void)
|
|
* BIOS call "INT 16H Function 00H" to read character from keyboard
|
|
* Call with %ah = 0x0
|
|
* Return: %ah = keyboard scan code
|
|
* %al = ASCII character
|
|
*/
|
|
|
|
/* this table is used in translate_keycode below */
|
|
translation_table:
|
|
.word PUPA_CONSOLE_KEY_LEFT, 2
|
|
.word PUPA_CONSOLE_KEY_RIGHT, 6
|
|
.word PUPA_CONSOLE_KEY_UP, 16
|
|
.word PUPA_CONSOLE_KEY_DOWN, 14
|
|
.word PUPA_CONSOLE_KEY_HOME, 1
|
|
.word PUPA_CONSOLE_KEY_END, 5
|
|
.word PUPA_CONSOLE_KEY_DC, 4
|
|
.word PUPA_CONSOLE_KEY_BACKSPACE, 8
|
|
.word PUPA_CONSOLE_KEY_PPAGE, 7
|
|
.word PUPA_CONSOLE_KEY_NPAGE, 3
|
|
.word 0
|
|
|
|
/*
|
|
* translate_keycode translates the key code %dx to an ascii code.
|
|
*/
|
|
.code16
|
|
|
|
translate_keycode:
|
|
pushw %bx
|
|
pushw %si
|
|
|
|
movw $ABS(translation_table), %si
|
|
|
|
1: lodsw
|
|
/* check if this is the end */
|
|
testw %ax, %ax
|
|
jz 2f
|
|
/* load the ascii code into %ax */
|
|
movw %ax, %bx
|
|
lodsw
|
|
/* check if this matches the key code */
|
|
cmpw %bx, %dx
|
|
jne 1b
|
|
/* translate %dx, if successful */
|
|
movw %ax, %dx
|
|
|
|
2: popw %si
|
|
popw %bx
|
|
ret
|
|
|
|
.code32
|
|
|
|
FUNCTION(pupa_console_getkey)
|
|
pushl %ebp
|
|
|
|
call prot_to_real
|
|
.code16
|
|
|
|
int $0x16
|
|
|
|
movw %ax, %dx /* real_to_prot uses %eax */
|
|
call translate_keycode
|
|
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movw %dx, %ax
|
|
|
|
popl %ebp
|
|
ret
|
|
|
|
|
|
/*
|
|
* int pupa_console_checkkey (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
|
|
*/
|
|
FUNCTION(pupa_console_checkkey)
|
|
pushl %ebp
|
|
xorl %edx, %edx
|
|
|
|
call prot_to_real /* enter real mode */
|
|
.code16
|
|
|
|
movb $0x1, %ah
|
|
int $0x16
|
|
|
|
jz notpending
|
|
|
|
movw %ax, %dx
|
|
DATA32 jmp pending
|
|
|
|
notpending:
|
|
decl %edx
|
|
|
|
pending:
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movl %edx, %eax
|
|
|
|
popl %ebp
|
|
ret
|
|
|
|
|
|
/*
|
|
* pupa_uint16_t pupa_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(pupa_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 pupa_console_gotoxy(pupa_uint8_t x, pupa_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(pupa_console_gotoxy)
|
|
pushl %ebp
|
|
pushl %ebx /* save EBX */
|
|
|
|
movb %dl, %dh /* %dh = y */
|
|
movb %al, %dl /* %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 pupa_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(pupa_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 pupa_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(pupa_console_setcursor)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
|
|
/* push ON */
|
|
pushl %eax
|
|
|
|
/* 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
|
|
|
|
/*
|
|
* pupa_getrtsecs()
|
|
* if a seconds value can be read, read it and return it (BCD),
|
|
* otherwise return 0xFF
|
|
* BIOS call "INT 1AH Function 02H" to check whether a character is pending
|
|
* Call with %ah = 0x2
|
|
* Return:
|
|
* If RT Clock can give correct values
|
|
* %ch = hour (BCD)
|
|
* %cl = minutes (BCD)
|
|
* %dh = seconds (BCD)
|
|
* %dl = daylight savings time (00h std, 01h daylight)
|
|
* Carry flag = clear
|
|
* else
|
|
* Carry flag = set
|
|
* (this indicates that the clock is updating, or
|
|
* that it isn't running)
|
|
*/
|
|
FUNCTION(pupa_getrtsecs)
|
|
pushl %ebp
|
|
|
|
call prot_to_real /* enter real mode */
|
|
.code16
|
|
|
|
clc
|
|
movb $0x2, %ah
|
|
int $0x1a
|
|
|
|
DATA32 jnc gottime
|
|
movb $0xff, %dh
|
|
|
|
gottime:
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movb %dh, %al
|
|
|
|
popl %ebp
|
|
ret
|
|
|
|
|
|
/*
|
|
* pupa_get_rtc()
|
|
* return the real time in ticks, of which there are about
|
|
* 18-20 per second
|
|
*/
|
|
FUNCTION(pupa_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 pupa_vga_set_mode (unsigned char mode)
|
|
*/
|
|
FUNCTION(pupa_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
|
|
|
|
|
|
/*
|
|
* unsigned char *pupa_vga_get_font (void)
|
|
*/
|
|
FUNCTION(pupa_vga_get_font)
|
|
pushl %ebp
|
|
pushl %ebx
|
|
|
|
call prot_to_real
|
|
.code16
|
|
movw $0x1130, %ax
|
|
movb $0x06, %bh
|
|
int $0x10
|
|
movw %es, %bx
|
|
movw %bp, %dx
|
|
DATA32 call real_to_prot
|
|
.code32
|
|
|
|
movzwl %bx, %ecx
|
|
shll $4, %ecx
|
|
movw %dx, %ax
|
|
addl %ecx, %eax
|
|
|
|
popl %ebx
|
|
popl %ebp
|
|
ret
|