diff options
Diffstat (limited to 'arch/x86_64/kernel/relocate_kernel.S')
| -rw-r--r-- | arch/x86_64/kernel/relocate_kernel.S | 143 |
1 files changed, 0 insertions, 143 deletions
diff --git a/arch/x86_64/kernel/relocate_kernel.S b/arch/x86_64/kernel/relocate_kernel.S deleted file mode 100644 index d24fa9b72a2..00000000000 --- a/arch/x86_64/kernel/relocate_kernel.S +++ /dev/null @@ -1,143 +0,0 @@ -/* - * 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> - - /* - * Must be relocatable PIC code callable as a C function, that once - * it starts can not use the previous processes stack. - */ - .globl relocate_new_kernel - .code64 -relocate_new_kernel: - /* %rdi page_list - * %rsi reboot_code_buffer - * %rdx start address - * %rcx page_table - * %r8 arg5 - * %r9 arg6 - */ - - /* zero out flags, and disable interrupts */ - pushq $0 - popfq - - /* set a new stack at the bottom of our page... */ - lea 4096(%rsi), %rsp - - /* store the parameters back on the stack */ - pushq %rdx /* store the start address */ - - /* 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 -relocate_new_kernel_end: - - .globl relocate_new_kernel_size -relocate_new_kernel_size: - .quad relocate_new_kernel_end - relocate_new_kernel |