diff options
Diffstat (limited to 'arch/x86/kernel/relocate_kernel_64.S')
| -rw-r--r-- | arch/x86/kernel/relocate_kernel_64.S | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S new file mode 100644 index 000000000000..14e95872c6a3 --- /dev/null +++ b/arch/x86/kernel/relocate_kernel_64.S @@ -0,0 +1,276 @@ +/* + * relocate_kernel.S - put the kernel image in place to boot + * Copyright (C) 2002-2005 Eric Biederman <ebiederm@xmission.com> + * + * This source code is licensed under the GNU General Public License, + * Version 2. See the file COPYING for more details. + */ + +#include <linux/linkage.h> +#include <asm/page.h> +#include <asm/kexec.h> + +/* + * Must be relocatable PIC code callable as a C function + */ + +#define PTR(x) (x << 3) +#define PAGE_ALIGNED (1 << PAGE_SHIFT) +#define PAGE_ATTR 0x63 /* _PAGE_PRESENT|_PAGE_RW|_PAGE_ACCESSED|_PAGE_DIRTY */ + + .text + .align PAGE_ALIGNED + .code64 + .globl relocate_kernel +relocate_kernel: + /* %rdi indirection_page + * %rsi page_list + * %rdx start address + */ + + /* map the control page at its virtual address */ + + movq $0x0000ff8000000000, %r10 /* mask */ + mov $(39 - 3), %cl /* bits to shift */ + movq PTR(VA_CONTROL_PAGE)(%rsi), %r11 /* address to map */ + + movq %r11, %r9 + andq %r10, %r9 + shrq %cl, %r9 + + movq PTR(VA_PGD)(%rsi), %r8 + addq %r8, %r9 + movq PTR(PA_PUD_0)(%rsi), %r8 + orq $PAGE_ATTR, %r8 + movq %r8, (%r9) + + shrq $9, %r10 + sub $9, %cl + + movq %r11, %r9 + andq %r10, %r9 + shrq %cl, %r9 + + movq PTR(VA_PUD_0)(%rsi), %r8 + addq %r8, %r9 + movq PTR(PA_PMD_0)(%rsi), %r8 + orq $PAGE_ATTR, %r8 + movq %r8, (%r9) + + shrq $9, %r10 + sub $9, %cl + + movq %r11, %r9 + andq %r10, %r9 + shrq %cl, %r9 + + movq PTR(VA_PMD_0)(%rsi), %r8 + addq %r8, %r9 + movq PTR(PA_PTE_0)(%rsi), %r8 + orq $PAGE_ATTR, %r8 + movq %r8, (%r9) + + shrq $9, %r10 + sub $9, %cl + + movq %r11, %r9 + andq %r10, %r9 + shrq %cl, %r9 + + movq PTR(VA_PTE_0)(%rsi), %r8 + addq %r8, %r9 + movq PTR(PA_CONTROL_PAGE)(%rsi), %r8 + orq $PAGE_ATTR, %r8 + movq %r8, (%r9) + + /* identity map the control page at its physical address */ + + movq $0x0000ff8000000000, %r10 /* mask */ + mov $(39 - 3), %cl /* bits to shift */ + movq PTR(PA_CONTROL_PAGE)(%rsi), %r11 /* address to map */ + + movq %r11, %r9 + andq %r10, %r9 + shrq %cl, %r9 + + movq PTR(VA_PGD)(%rsi), %r8 + addq %r8, %r9 + movq PTR(PA_PUD_1)(%rsi), %r8 + orq $PAGE_ATTR, %r8 + movq %r8, (%r9) + + shrq $9, %r10 + sub $9, %cl + + movq %r11, %r9 + andq %r10, %r9 + shrq %cl, %r9 + + movq PTR(VA_PUD_1)(%rsi), %r8 + addq %r8, %r9 + movq PTR(PA_PMD_1)(%rsi), %r8 + orq $PAGE_ATTR, %r8 + movq %r8, (%r9) + + shrq $9, %r10 + sub $9, %cl + + movq %r11, %r9 + andq %r10, %r9 + shrq %cl, %r9 + + movq PTR(VA_PMD_1)(%rsi), %r8 + addq %r8, %r9 + movq PTR(PA_PTE_1)(%rsi), %r8 + orq $PAGE_ATTR, %r8 + movq %r8, (%r9) + + shrq $9, %r10 + sub $9, %cl + + movq %r11, %r9 + andq %r10, %r9 + shrq %cl, %r9 + + movq PTR(VA_PTE_1)(%rsi), %r8 + addq %r8, %r9 + movq PTR(PA_CONTROL_PAGE)(%rsi), %r8 + orq $PAGE_ATTR, %r8 + movq %r8, (%r9) + +relocate_new_kernel: + /* %rdi indirection_page + * %rsi page_list + * %rdx start address + */ + + /* zero out flags, and disable interrupts */ + pushq $0 + popfq + + /* get physical address of control page now */ + /* this is impossible after page table switch */ + movq PTR(PA_CONTROL_PAGE)(%rsi), %r8 + + /* get physical address of page table now too */ + movq PTR(PA_TABLE_PAGE)(%rsi), %rcx + + /* switch to new set of page tables */ + movq PTR(PA_PGD)(%rsi), %r9 + movq %r9, %cr3 + + /* setup a new stack at the end of the physical control page */ + lea 4096(%r8), %rsp + + /* jump to identity mapped page */ + addq $(identity_mapped - relocate_kernel), %r8 + pushq %r8 + ret + +identity_mapped: + /* store the start address on the stack */ + pushq %rdx + + /* Set cr0 to a known state: + * 31 1 == Paging enabled + * 18 0 == Alignment check disabled + * 16 0 == Write protect disabled + * 3 0 == No task switch + * 2 0 == Don't do FP software emulation. + * 0 1 == Proctected mode enabled + */ + movq %cr0, %rax + andq $~((1<<18)|(1<<16)|(1<<3)|(1<<2)), %rax + orl $((1<<31)|(1<<0)), %eax + movq %rax, %cr0 + + /* Set cr4 to a known state: + * 10 0 == xmm exceptions disabled + * 9 0 == xmm registers instructions disabled + * 8 0 == performance monitoring counter disabled + * 7 0 == page global disabled + * 6 0 == machine check exceptions disabled + * 5 1 == physical address extension enabled + * 4 0 == page size extensions disabled + * 3 0 == Debug extensions disabled + * 2 0 == Time stamp disable (disabled) + * 1 0 == Protected mode virtual interrupts disabled + * 0 0 == VME disabled + */ + + movq $((1<<5)), %rax + movq %rax, %cr4 + + jmp 1f +1: + + /* Switch to the identity mapped page tables, + * and flush the TLB. + */ + movq %rcx, %cr3 + + /* Do the copies */ + movq %rdi, %rcx /* Put the page_list in %rcx */ + xorq %rdi, %rdi + xorq %rsi, %rsi + jmp 1f + +0: /* top, read another word for the indirection page */ + + movq (%rbx), %rcx + addq $8, %rbx +1: + testq $0x1, %rcx /* is it a destination page? */ + jz 2f + movq %rcx, %rdi + andq $0xfffffffffffff000, %rdi + jmp 0b +2: + testq $0x2, %rcx /* is it an indirection page? */ + jz 2f + movq %rcx, %rbx + andq $0xfffffffffffff000, %rbx + jmp 0b +2: + testq $0x4, %rcx /* is it the done indicator? */ + jz 2f + jmp 3f +2: + testq $0x8, %rcx /* is it the source indicator? */ + jz 0b /* Ignore it otherwise */ + movq %rcx, %rsi /* For ever source page do a copy */ + andq $0xfffffffffffff000, %rsi + + movq $512, %rcx + rep ; movsq + jmp 0b +3: + + /* To be certain of avoiding problems with self-modifying code + * I need to execute a serializing instruction here. + * So I flush the TLB by reloading %cr3 here, it's handy, + * and not processor dependent. + */ + movq %cr3, %rax + movq %rax, %cr3 + + /* set all of the registers to known values */ + /* leave %rsp alone */ + + xorq %rax, %rax + xorq %rbx, %rbx + xorq %rcx, %rcx + xorq %rdx, %rdx + xorq %rsi, %rsi + xorq %rdi, %rdi + xorq %rbp, %rbp + xorq %r8, %r8 + xorq %r9, %r9 + xorq %r10, %r9 + xorq %r11, %r11 + xorq %r12, %r12 + xorq %r13, %r13 + xorq %r14, %r14 + xorq %r15, %r15 + + ret |