2009-05-17 Vladimir Serbinenko <phcoder@gmail.com>
trampoline for linux on 64-bit platform * conf/x86_64-efi.rmk (linux_mod_SOURCES): added loader/i386/efi/linux_trampoline.S * include/grub/x86_64/efi/loader.h (grub_linux_real_boot): removed declration * kern/x86_64/efi/startup.S (grub_linux_real_boot): moved from here * loader/i386/linux_trampoline.S: moved here * loader/i386/efi/linux.c (allocate_pages): reserve space for trampoline (jumpvector): removed (grub_linux_trampoline_start): new declaration (grub_linux_trampoline_end): likewise (grub_linux_boot): use trampoline when on 64-bit platform * loader/i386/linux.c: likewise
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phcoder
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7 changed files with 157 additions and 60 deletions
17
ChangeLog
17
ChangeLog
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@ -1,3 +1,20 @@
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2009-05-17 Vladimir Serbinenko <phcoder@gmail.com>
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trampoline for linux on 64-bit platform
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* conf/x86_64-efi.rmk (linux_mod_SOURCES): added
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loader/i386/efi/linux_trampoline.S
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* include/grub/x86_64/efi/loader.h (grub_linux_real_boot): removed
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declration
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* kern/x86_64/efi/startup.S (grub_linux_real_boot): moved from here
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* loader/i386/linux_trampoline.S: moved here
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* loader/i386/efi/linux.c (allocate_pages): reserve space for trampoline
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(jumpvector): removed
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(grub_linux_trampoline_start): new declaration
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(grub_linux_trampoline_end): likewise
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(grub_linux_boot): use trampoline when on 64-bit platform
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* loader/i386/linux.c: likewise
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2009-05-16 Pavel Roskin <proski@gnu.org>
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* script/lua/grub_lib.c (grub_lua_getenv): Make name and value
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@ -137,7 +137,7 @@ appleldr_mod_CFLAGS = $(COMMON_CFLAGS)
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appleldr_mod_LDFLAGS = $(COMMON_LDFLAGS)
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# For linux.mod.
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linux_mod_SOURCES = loader/i386/efi/linux.c
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linux_mod_SOURCES = loader/i386/efi/linux.c loader/i386/linux_trampoline.S
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linux_mod_CFLAGS = $(COMMON_CFLAGS)
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linux_mod_LDFLAGS = $(COMMON_LDFLAGS)
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@ -22,6 +22,5 @@
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#include <grub/types.h>
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#include <grub/symbol.h>
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void EXPORT_FUNC(grub_linux_real_boot) (void);
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#endif /* ! GRUB_LOADER_MACHINE_HEADER */
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@ -61,26 +61,3 @@ codestart:
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call EXT_C(grub_main)
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ret
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.code32
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FUNCTION(grub_linux_real_boot)
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/* Turn off PG bit in CR0 and set CR3 to zero. */
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movl %cr0, %eax
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andl $0x7FFFFFFF, %eax
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movl %eax, %cr0
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/* Setup EFER (Extended Feature Enable Register). */
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movl $0xc0000080, %ecx
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rdmsr
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/* Disable Long Mode. */
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andl $0xFFFFFEFF, %eax
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/* Make changes effective. */
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wrmsr
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/* Disable PAE. */
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xorl %eax, %eax
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movl %eax, %cr4
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jmp *%ebx
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@ -241,7 +241,7 @@ allocate_pages (grub_size_t prot_size)
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/* Next, find free pages for the protected mode code. */
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/* XXX what happens if anything is using this address? */
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prot_mode_mem = grub_efi_allocate_pages (0x100000, prot_mode_pages);
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prot_mode_mem = grub_efi_allocate_pages (0x100000, prot_mode_pages + 1);
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if (! prot_mode_mem)
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{
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grub_error (GRUB_ERR_OUT_OF_MEMORY,
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@ -286,11 +286,8 @@ grub_e820_add_region (struct grub_e820_mmap *e820_map, int *e820_num,
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}
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#ifdef __x86_64__
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struct
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{
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grub_uint32_t kernel_entry;
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grub_uint32_t kernel_cs;
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} jumpvector;
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extern grub_uint8_t grub_linux_trampoline_start[];
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extern grub_uint8_t grub_linux_trampoline_end[];
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#endif
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static grub_err_t
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@ -384,6 +381,18 @@ grub_linux_boot (void)
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params->v0204.efi_mmap_size = mmap_size;
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}
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#ifdef __x86_64__
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grub_memcpy ((char *) prot_mode_mem + (prot_mode_pages << 12),
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grub_linux_trampoline_start,
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grub_linux_trampoline_end - grub_linux_trampoline_start);
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((void (*) (unsigned long, void *)) ((char *) prot_mode_mem
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+ (prot_mode_pages << 12)))
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(params->code32_start, real_mode_mem);
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#else
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/* Hardware interrupts are not safe any longer. */
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asm volatile ("cli" : : );
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@ -391,18 +400,6 @@ grub_linux_boot (void)
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asm volatile ("lidt %0" : : "m" (idt_desc));
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asm volatile ("lgdt %0" : : "m" (gdt_desc));
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#ifdef __x86_64__
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jumpvector.kernel_entry = (grub_uint64_t) grub_linux_real_boot;
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jumpvector.kernel_cs = 0x10;
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asm volatile ( "mov %0, %%rbx" : : "m" (params->code32_start));
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asm volatile ( "mov %0, %%rsi" : : "m" (real_mode_mem));
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asm volatile ( "ljmp *%0" : : "m" (jumpvector));
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#else
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/* Pass parameters. */
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asm volatile ("movl %0, %%ecx" : : "m" (params->code32_start));
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asm volatile ("movl %0, %%esi" : : "m" (real_mode_mem));
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@ -433,11 +433,8 @@ grub_linux_setup_video (struct linux_kernel_params *params)
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}
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#ifdef __x86_64__
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struct
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{
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grub_uint32_t kernel_entry;
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grub_uint32_t kernel_cs;
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} jumpvector;
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extern grub_uint8_t grub_linux_trampoline_start[];
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extern grub_uint8_t grub_linux_trampoline_end[];
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#endif
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static grub_err_t
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@ -549,6 +546,16 @@ grub_linux_boot (void)
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grub_mmap_iterate (hook);
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params->mmap_size = e820_num;
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#ifdef __x86_64__
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grub_memcpy ((char *) prot_mode_mem + (prot_mode_pages << 12),
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grub_linux_trampoline_start,
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grub_linux_trampoline_end - grub_linux_trampoline_start);
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((void (*) (unsigned long, void *)) ((char *) prot_mode_mem
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+ (prot_mode_pages << 12)))
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(params->code32_start, real_mode_mem);
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#else
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/* Hardware interrupts are not safe any longer. */
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asm volatile ("cli" : : );
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@ -557,18 +564,6 @@ grub_linux_boot (void)
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asm volatile ("lidt %0" : : "m" (idt_desc));
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asm volatile ("lgdt %0" : : "m" (gdt_desc));
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#ifdef __x86_64__
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jumpvector.kernel_entry = (grub_uint64_t) grub_linux_real_boot;
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jumpvector.kernel_cs = 0x10;
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asm volatile ( "mov %0, %%rbx" : : "m" (params->code32_start));
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asm volatile ( "mov %0, %%rsi" : : "m" (real_mode_mem));
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asm volatile ( "ljmp *%0" : : "m" (jumpvector));
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#else
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/* Pass parameters. */
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asm volatile ("movl %0, %%ecx" : : "m" (params->code32_start));
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asm volatile ("movl %0, %%esi" : : "m" (real_mode_mem));
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112
loader/i386/linux_trampoline.S
Normal file
112
loader/i386/linux_trampoline.S
Normal file
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@ -0,0 +1,112 @@
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 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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#include <grub/symbol.h>
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.p2align 4 /* force 16-byte alignment */
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VARIABLE(grub_linux_trampoline_start)
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cli
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/* %rdi contains protected memory start and %rsi
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contains real memory start. */
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mov %rsi, %rbx
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call base
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base:
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pop %rsi
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lea (cont1-base)(%rsi, 1), %rax
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mov %eax, (jump_vector-base)(%rsi,1)
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lea (gdt-base)(%rsi, 1), %rax
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mov %rax, (gdtaddr-base)(%rsi,1)
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/* Switch to compatibility mode. */
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lidt (idtdesc-base)(%rsi,1)
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lgdt (gdtdesc-base)(%rsi,1)
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/* Update %cs. Thanks to David Miller for pointing this mistake out. */
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ljmp *(jump_vector-base)(%rsi,1)
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cont1:
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.code32
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/* Update other registers. */
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mov $0x18, %eax
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mov %eax, %ds
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mov %eax, %es
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mov %eax, %fs
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mov %eax, %gs
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mov %eax, %ss
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/* Disable paging. */
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mov %cr0, %eax
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and $0x7fffffff, %eax
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mov %eax, %cr0
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/* Disable amd64. */
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mov $0xc0000080, %ecx
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rdmsr
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and $0xfffffeff, %eax
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wrmsr
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/* Turn off PAE. */
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movl %cr4, %eax
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and $0xffffffcf, %eax
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mov %eax, %cr4
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jmp cont2
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cont2:
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.code32
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mov %ebx, %esi
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jmp *%edi
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/* GDT. */
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.p2align 4
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gdt:
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/* NULL. */
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.byte 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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/* Reserved. */
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.byte 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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/* Code segment. */
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.byte 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x9A, 0xCF, 0x00
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/* Data segment. */
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.byte 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x92, 0xCF, 0x00
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gdtdesc:
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.word 31
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gdtaddr:
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.quad gdt
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idtdesc:
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.word 0
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idtaddr:
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.quad 0
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.p2align 4
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jump_vector:
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/* Jump location. Is filled by the code */
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.long 0
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.long 0x10
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VARIABLE(grub_linux_trampoline_end)
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