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Relocator64 support

This commit is contained in:
Vladimir 'phcoder' Serbinenko 2010-01-12 17:48:51 +01:00
parent 1d24828f20
commit 14933205d1
5 changed files with 277 additions and 3 deletions
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1
conf/i386.rmk
View File

@ -17,6 +17,7 @@ vga_text_mod_LDFLAGS = $(COMMON_LDFLAGS)
pkglib_MODULES += relocator.mod
relocator_mod_SOURCES = lib/relocator.c lib/i386/relocator32.S \
lib/i386/relocator64.S \
lib/i386/relocator_asm.S lib/i386/relocator.c
relocator_mod_CFLAGS = $(COMMON_CFLAGS)
relocator_mod_ASFLAGS = $(COMMON_ASFLAGS)

3
include/grub/i386/memory.h
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@ -22,7 +22,8 @@
/* The flag for protected mode. */
#define GRUB_MEMORY_CPU_CR0_PE_ON 0x1
#define GRUB_MEMORY_CPU_CR4_PAE_ON 0x00000040
#define GRUB_MEMORY_CPU_CR4_PAE_ON 0x00000020
#define GRUB_MEMORY_CPU_CR4_PSE_ON 0x00000010
#define GRUB_MEMORY_CPU_CR0_PAGING_ON 0x80000000
#define GRUB_MEMORY_CPU_AMD64_MSR 0xc0000080
#define GRUB_MEMORY_CPU_AMD64_MSR_ON 0x00000100

16
include/grub/i386/relocator.h
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@ -34,7 +34,23 @@ struct grub_relocator32_state
grub_uint32_t esi;
};
struct grub_relocator64_state
{
grub_uint64_t rsp;
grub_uint64_t rax;
grub_uint64_t rbx;
grub_uint64_t rcx;
grub_uint64_t rdx;
grub_uint64_t rip;
grub_uint64_t rsi;
grub_addr_t cr3;
};
grub_err_t grub_relocator32_boot (struct grub_relocator *rel,
struct grub_relocator32_state state);
grub_err_t grub_relocator64_boot (struct grub_relocator *rel,
struct grub_relocator64_state state,
grub_addr_t min_addr, grub_addr_t max_addr);
#endif /* ! GRUB_RELOCATOR_CPU_HEADER */

54
lib/i386/relocator.c
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@ -26,8 +26,6 @@
#include <grub/i386/relocator.h>
#include <grub/relocator_private.h>
extern grub_uint8_t grub_relocator32_start;
extern grub_uint8_t grub_relocator32_end;
extern grub_uint8_t grub_relocator_forward_start;
extern grub_uint8_t grub_relocator_forward_end;
extern grub_uint8_t grub_relocator_backward_start;
@ -41,6 +39,8 @@ extern void *grub_relocator_forward_dest;
extern void *grub_relocator_forward_src;
extern grub_size_t grub_relocator_forward_chunk_size;
extern grub_uint8_t grub_relocator32_start;
extern grub_uint8_t grub_relocator32_end;
extern grub_uint32_t grub_relocator32_eax;
extern grub_uint32_t grub_relocator32_ebx;
extern grub_uint32_t grub_relocator32_ecx;
@ -49,6 +49,18 @@ extern grub_uint32_t grub_relocator32_eip;
extern grub_uint32_t grub_relocator32_esp;
extern grub_uint32_t grub_relocator32_esi;
extern grub_uint8_t grub_relocator64_start;
extern grub_uint8_t grub_relocator64_end;
extern grub_uint64_t grub_relocator64_rax;
extern grub_uint64_t grub_relocator64_rbx;
extern grub_uint64_t grub_relocator64_rcx;
extern grub_uint64_t grub_relocator64_rdx;
extern grub_uint64_t grub_relocator64_rip;
extern grub_uint64_t grub_relocator64_rip_addr;
extern grub_uint64_t grub_relocator64_rsp;
extern grub_uint64_t grub_relocator64_rsi;
extern grub_addr_t grub_relocator64_cr3;
#define RELOCATOR_SIZEOF(x) (&grub_relocator##x##_end - &grub_relocator##x##_start)
grub_size_t grub_relocator_align = 1;
@ -141,3 +153,41 @@ grub_relocator32_boot (struct grub_relocator *rel,
/* Not reached. */
return GRUB_ERR_NONE;
}
grub_err_t
grub_relocator64_boot (struct grub_relocator *rel,
struct grub_relocator64_state state,
grub_addr_t min_addr, grub_addr_t max_addr)
{
grub_addr_t target;
void *src;
grub_err_t err;
grub_addr_t relst;
err = grub_relocator_alloc_chunk_align (rel, &src, &target, min_addr,
max_addr - RELOCATOR_SIZEOF (64),
RELOCATOR_SIZEOF (64), 16);
if (err)
return err;
grub_relocator64_rax = state.rax;
grub_relocator64_rbx = state.rbx;
grub_relocator64_rcx = state.rcx;
grub_relocator64_rdx = state.rdx;
grub_relocator64_rip = state.rip;
grub_relocator64_rsp = state.rsp;
grub_relocator64_rsi = state.rsi;
grub_relocator64_cr3 = state.cr3;
grub_memmove (src, &grub_relocator64_start, RELOCATOR_SIZEOF (64));
err = grub_relocator_prepare_relocs (rel, target, &relst);
if (err)
return err;
asm volatile ("cli");
((void (*) (void)) relst) ();
/* Not reached. */
return GRUB_ERR_NONE;
}

206
lib/i386/relocator64.S Normal file
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@ -0,0 +1,206 @@
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2009,2010 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/symbol.h>
#include <grub/i386/memory.h>
#ifdef __x86_64__
#define RAX %rax
#define RSI %rdi
#else
#define RAX %eax
#define RSI %esi
#endif
#define CODE32_SEGMENT 0x18
#define CODE64_SEGMENT 0x08
/* The data segment of the protected mode. */
#define DATA_SEGMENT 0x10
.p2align 4 /* force 16-byte alignment */
VARIABLE(grub_relocator64_start)
LOCAL(base):
/* %rax contains now our new 'base'. */
mov RAX, RSI
add $(LOCAL(cont0) - LOCAL(base)), RAX
jmp *RAX
LOCAL(cont0):
lea (LOCAL(cont1) - LOCAL(base)) (RSI, 1), RAX
mov RAX, (LOCAL(jump_vector) - LOCAL(base)) (RSI, 1)
lea (LOCAL(gdt) - LOCAL(base)) (RSI, 1), RAX
mov RAX, (LOCAL(gdt_addr) - LOCAL(base)) (RSI, 1)
#ifndef __x86_64__
/* Disable paging. */
movl %cr0, %eax
andl $(~GRUB_MEMORY_CPU_CR0_PAGING_ON), %eax
movl %eax, %cr0
/* Turn on PAE. */
movl %cr4, %eax
orl $(GRUB_MEMORY_CPU_CR4_PAE_ON | GRUB_MEMORY_CPU_CR4_PSE_ON), %eax
movl %eax, %cr4
/* mov imm32, %eax */
.byte 0xb8
VARIABLE(grub_relocator64_cr3)
.long 0
movl %eax, %cr3
/* Turn on amd64. */
movl $GRUB_MEMORY_CPU_AMD64_MSR, %ecx
rdmsr
orl $GRUB_MEMORY_CPU_AMD64_MSR_ON, %eax
wrmsr
/* Enable paging. */
movl %cr0, %eax
orl $GRUB_MEMORY_CPU_CR0_PAGING_ON, %eax
movl %eax, %cr0
#else
/* mov imm64, %rax */
.byte 0x48
.byte 0xb8
VARIABLE(grub_relocator64_cr3)
.quad 0
movl %rax, %cr3
#endif
/* Load GDT. */
lgdt (LOCAL(gdtdesc) - LOCAL(base)) (RSI, 1)
/* Update %cs. */
ljmp *(LOCAL(jump_vector) - LOCAL(base)) (RSI, 1)
LOCAL(cont1):
.code64
/* mov imm64, %rax */
.byte 0x48
.byte 0xb8
VARIABLE(grub_relocator64_rsp)
.quad 0
movq %rax, %rsp
/* mov imm64, %rax */
.byte 0x48
.byte 0xb8
VARIABLE(grub_relocator64_rsi)
.quad 0
movq %rax, %rsi
/* mov imm64, %rax */
.byte 0x48
.byte 0xb8
VARIABLE(grub_relocator64_rax)
.quad 0
/* mov imm64, %rbx */
.byte 0x48
.byte 0xbb
VARIABLE(grub_relocator64_rbx)
.quad 0
/* mov imm64, %rcx */
.byte 0x48
.byte 0xb9
VARIABLE(grub_relocator64_rcx)
.quad 0
/* mov imm64, %rdx */
.byte 0x48
.byte 0xba
VARIABLE(grub_relocator64_rdx)
.quad 0
/* Cleared direction flag is of no problem with any current
payload and makes this implementation easier. */
cld
jmp *LOCAL(jump_addr) (%rip)
LOCAL(jump_addr):
VARIABLE(grub_relocator64_rip)
.quad 0
.p2align 4
LOCAL(gdt):
/* NULL. */
.byte 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
/* 64-bit segment. */
.word 0xffff /* Limit xffff. */
.word 0x0000 /* Base xxxx0000. */
.byte 0x00 /* Base xx00xxxx. */
.byte (0x8 /* Type 8. */ | (1 << 4) /* Code. */ \
| (0 << 5) /* Ring 0. */ | (1 << 7) /* Present. */)
.byte (0xf /* Limit fxxxx. */ | (0 << 4) /* AVL flag. */ \
| (1 << 5) /* 64-bit. */ | (0 << 6) \
| (1 << 7) /* 4K granular. */)
.byte 0x00 /* Base 00xxxxxx. */
/* Data segment*/
.word 0xffff /* Limit xffff. */
.word 0x0000 /* Base xxxx0000. */
.byte 0x00 /* Base xx00xxxx. */
.byte (0x0 /* Type 0. */ | (0 << 4) /* Data. */ \
| (0 << 5) /* Ring 0. */ | (1 << 7) /* Present. */)
.byte (0xf /* Limit fxxxx. */ | (0 << 4) /* AVL flag. */ \
| (0 << 5) /* Data. */ | (0 << 6) \
| (1 << 7) /* 4K granular. */)
.byte 0x00 /* Base 00xxxxxx. */
/* Compatibility segment. */
.word 0xffff /* Limit xffff. */
.word 0x0000 /* Base xxxx0000. */
.byte 0x00 /* Base xx00xxxx. */
.byte (0x8 /* Type 8. */ | (1 << 4) /* Code. */ \
| (0 << 5) /* Ring 0. */ | (1 << 7) /* Present. */)
.byte (0xf /* Limit fxxxx. */ | (0 << 4) /* AVL flag. */ \
| (0 << 5) /* 32-bit. */ | (1 << 6) /* 32-bit. */ \
| (1 << 7) /* 4K granular. */)
.byte 0x00 /* Base 00xxxxxx. */
.p2align 4
LOCAL(gdtdesc):
.word 0x20
LOCAL(gdt_addr):
#ifdef __x86_64__
/* Filled by the code. */
.quad 0
#else
/* Filled by the code. */
.long 0
#endif
.p2align 4
LOCAL(jump_vector):
/* Jump location. Is filled by the code */
#ifdef __x86_64__
.quad 0
#else
.long 0
#endif
.long CODE64_SEGMENT
VARIABLE(grub_relocator64_end)