diff options
Diffstat (limited to 'arch/x86/kernel/acpi/wakeup_64.S')
| -rw-r--r-- | arch/x86/kernel/acpi/wakeup_64.S | 313 |
1 files changed, 9 insertions, 304 deletions
diff --git a/arch/x86/kernel/acpi/wakeup_64.S b/arch/x86/kernel/acpi/wakeup_64.S index 2e1b9e0d0767..bcc293423a70 100644 --- a/arch/x86/kernel/acpi/wakeup_64.S +++ b/arch/x86/kernel/acpi/wakeup_64.S @@ -7,191 +7,18 @@ #include <asm/asm-offsets.h> # Copyright 2003 Pavel Machek <pavel@suse.cz>, distribute under GPLv2 -# -# wakeup_code runs in real mode, and at unknown address (determined at run-time). -# Therefore it must only use relative jumps/calls. -# -# Do we need to deal with A20? It is okay: ACPI specs says A20 must be enabled -# -# If physical address of wakeup_code is 0x12345, BIOS should call us with -# cs = 0x1234, eip = 0x05 -# - -#define BEEP \ - inb $97, %al; \ - outb %al, $0x80; \ - movb $3, %al; \ - outb %al, $97; \ - outb %al, $0x80; \ - movb $-74, %al; \ - outb %al, $67; \ - outb %al, $0x80; \ - movb $-119, %al; \ - outb %al, $66; \ - outb %al, $0x80; \ - movb $15, %al; \ - outb %al, $66; - - -ALIGN - .align 16 -ENTRY(wakeup_start) -wakeup_code: - wakeup_code_start = . - .code16 - -# Running in *copy* of this code, somewhere in low 1MB. - - cli - cld - # setup data segment - movw %cs, %ax - movw %ax, %ds # Make ds:0 point to wakeup_start - movw %ax, %ss - - # Data segment must be set up before we can see whether to beep. - testl $4, realmode_flags - wakeup_code - jz 1f - BEEP -1: - - # Private stack is needed for ASUS board - mov $(wakeup_stack - wakeup_code), %sp - - pushl $0 # Kill any dangerous flags - popfl - - movl real_magic - wakeup_code, %eax - cmpl $0x12345678, %eax - jne bogus_real_magic - - testl $1, realmode_flags - wakeup_code - jz 1f - lcall $0xc000,$3 - movw %cs, %ax - movw %ax, %ds # Bios might have played with that - movw %ax, %ss -1: - - testl $2, realmode_flags - wakeup_code - jz 1f - mov video_mode - wakeup_code, %ax - call mode_set -1: - - mov %ds, %ax # Find 32bit wakeup_code addr - movzx %ax, %esi # (Convert %ds:gdt to a liner ptr) - shll $4, %esi - # Fix up the vectors - addl %esi, wakeup_32_vector - wakeup_code - addl %esi, wakeup_long64_vector - wakeup_code - addl %esi, gdt_48a + 2 - wakeup_code # Fixup the gdt pointer - - lidtl %ds:idt_48a - wakeup_code - lgdtl %ds:gdt_48a - wakeup_code # load gdt with whatever is - # appropriate - - movl $1, %eax # protected mode (PE) bit - lmsw %ax # This is it! - jmp 1f -1: - - ljmpl *(wakeup_32_vector - wakeup_code) - - .balign 4 -wakeup_32_vector: - .long wakeup_32 - wakeup_code - .word __KERNEL32_CS, 0 - - .code32 -wakeup_32: -# Running in this code, but at low address; paging is not yet turned on. - - movl $__KERNEL_DS, %eax - movl %eax, %ds - - /* - * Prepare for entering 64bits mode - */ - - /* Enable PAE */ - xorl %eax, %eax - btsl $5, %eax - movl %eax, %cr4 - - /* Setup early boot stage 4 level pagetables */ - leal (wakeup_level4_pgt - wakeup_code)(%esi), %eax - movl %eax, %cr3 - - /* Check if nx is implemented */ - movl $0x80000001, %eax - cpuid - movl %edx,%edi - - /* Enable Long Mode */ - xorl %eax, %eax - btsl $_EFER_LME, %eax - - /* No Execute supported? */ - btl $20,%edi - jnc 1f - btsl $_EFER_NX, %eax - - /* Make changes effective */ -1: movl $MSR_EFER, %ecx - xorl %edx, %edx - wrmsr - - xorl %eax, %eax - btsl $31, %eax /* Enable paging and in turn activate Long Mode */ - btsl $0, %eax /* Enable protected mode */ - - /* Make changes effective */ - movl %eax, %cr0 - - /* At this point: - CR4.PAE must be 1 - CS.L must be 0 - CR3 must point to PML4 - Next instruction must be a branch - This must be on identity-mapped page - */ - /* - * At this point we're in long mode but in 32bit compatibility mode - * with EFER.LME = 1, CS.L = 0, CS.D = 1 (and in turn - * EFER.LMA = 1). Now we want to jump in 64bit mode, to do that we load - * the new gdt/idt that has __KERNEL_CS with CS.L = 1. - */ - - /* Finally jump in 64bit mode */ - ljmp *(wakeup_long64_vector - wakeup_code)(%esi) - - .balign 4 -wakeup_long64_vector: - .long wakeup_long64 - wakeup_code - .word __KERNEL_CS, 0 .code64 - - /* Hooray, we are in Long 64-bit mode (but still running in - * low memory) - */ -wakeup_long64: /* - * We must switch to a new descriptor in kernel space for the GDT - * because soon the kernel won't have access anymore to the userspace - * addresses where we're currently running on. We have to do that here - * because in 32bit we couldn't load a 64bit linear address. + * Hooray, we are in Long 64-bit mode (but still running in low memory) */ - lgdt cpu_gdt_descr - - movq saved_magic, %rax - movq $0x123456789abcdef0, %rdx - cmpq %rdx, %rax - jne bogus_64_magic +ENTRY(wakeup_long64) +wakeup_long64: + movq saved_magic, %rax + movq $0x123456789abcdef0, %rdx + cmpq %rdx, %rax + jne bogus_64_magic - nop - nop movw $__KERNEL_DS, %ax movw %ax, %ss movw %ax, %ds @@ -208,130 +35,8 @@ wakeup_long64: movq saved_rip, %rax jmp *%rax -.code32 - - .align 64 -gdta: - /* Its good to keep gdt in sync with one in trampoline.S */ - .word 0, 0, 0, 0 # dummy - /* ??? Why I need the accessed bit set in order for this to work? */ - .quad 0x00cf9b000000ffff # __KERNEL32_CS - .quad 0x00af9b000000ffff # __KERNEL_CS - .quad 0x00cf93000000ffff # __KERNEL_DS - -idt_48a: - .word 0 # idt limit = 0 - .word 0, 0 # idt base = 0L - -gdt_48a: - .word 0x800 # gdt limit=2048, - # 256 GDT entries - .long gdta - wakeup_code # gdt base (relocated in later) - -real_magic: .quad 0 -video_mode: .quad 0 -realmode_flags: .quad 0 - -.code16 -bogus_real_magic: - jmp bogus_real_magic - -.code64 bogus_64_magic: - jmp bogus_64_magic - -/* This code uses an extended set of video mode numbers. These include: - * Aliases for standard modes - * NORMAL_VGA (-1) - * EXTENDED_VGA (-2) - * ASK_VGA (-3) - * Video modes numbered by menu position -- NOT RECOMMENDED because of lack - * of compatibility when extending the table. These are between 0x00 and 0xff. - */ -#define VIDEO_FIRST_MENU 0x0000 - -/* Standard BIOS video modes (BIOS number + 0x0100) */ -#define VIDEO_FIRST_BIOS 0x0100 - -/* VESA BIOS video modes (VESA number + 0x0200) */ -#define VIDEO_FIRST_VESA 0x0200 - -/* Video7 special modes (BIOS number + 0x0900) */ -#define VIDEO_FIRST_V7 0x0900 - -# Setting of user mode (AX=mode ID) => CF=success - -# For now, we only handle VESA modes (0x0200..0x03ff). To handle other -# modes, we should probably compile in the video code from the boot -# directory. -.code16 -mode_set: - movw %ax, %bx - subb $VIDEO_FIRST_VESA>>8, %bh - cmpb $2, %bh - jb check_vesa - -setbad: - clc - ret - -check_vesa: - orw $0x4000, %bx # Use linear frame buffer - movw $0x4f02, %ax # VESA BIOS mode set call - int $0x10 - cmpw $0x004f, %ax # AL=4f if implemented - jnz setbad # AH=0 if OK - - stc - ret - -wakeup_stack_begin: # Stack grows down - -.org 0xff0 -wakeup_stack: # Just below end of page - -.org 0x1000 -ENTRY(wakeup_level4_pgt) - .quad level3_ident_pgt - __START_KERNEL_map + _KERNPG_TABLE - .fill 510,8,0 - /* (2^48-(2*1024*1024*1024))/(2^39) = 511 */ - .quad level3_kernel_pgt - __START_KERNEL_map + _KERNPG_TABLE - -ENTRY(wakeup_end) - -## -# acpi_copy_wakeup_routine -# -# Copy the above routine to low memory. -# -# Parameters: -# %rdi: place to copy wakeup routine to -# -# Returned address is location of code in low memory (past data and stack) -# - .code64 -ENTRY(acpi_copy_wakeup_routine) - pushq %rax - pushq %rdx - - movl saved_video_mode, %edx - movl %edx, video_mode - wakeup_start (,%rdi) - movl acpi_realmode_flags, %edx - movl %edx, realmode_flags - wakeup_start (,%rdi) - movq $0x12345678, real_magic - wakeup_start (,%rdi) - movq $0x123456789abcdef0, %rdx - movq %rdx, saved_magic - - movq saved_magic, %rax - movq $0x123456789abcdef0, %rdx - cmpq %rdx, %rax - jne bogus_64_magic - - # restore the regs we used - popq %rdx - popq %rax -ENTRY(do_suspend_lowlevel_s4bios) - ret + jmp bogus_64_magic .align 2 .p2align 4,,15 @@ -414,7 +119,7 @@ do_suspend_lowlevel: jmp restore_processor_state .LFE5: .Lfe5: - .size do_suspend_lowlevel,.Lfe5-do_suspend_lowlevel + .size do_suspend_lowlevel, .Lfe5-do_suspend_lowlevel .data ALIGN |