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linux-next/arch/x86/kernel/acpi/wakeup_64.S
Pavel Machek 50a1efe14f s2ram: kill old debugging junk 
This removes old debugging stuff, that should be no longer neccessary.  It
accessed VGA hardware (which may not be ready at this point), and used LEDs
at port 80 for debugging.

Signed-off-by: Pavel Machek <pavel@suse.cz>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-10-18 14:37:19 -07:00

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.text
#include <linux/linkage.h>
#include <asm/segment.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/msr.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.
*/
lgdt cpu_gdt_descr
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
movw %ax, %es
movw %ax, %fs
movw %ax, %gs
movq saved_rsp, %rsp
movq saved_rbx, %rbx
movq saved_rdi, %rdi
movq saved_rsi, %rsi
movq saved_rbp, %rbp
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
.align 2
.p2align 4,,15
.globl do_suspend_lowlevel
.type do_suspend_lowlevel,@function
do_suspend_lowlevel:
.LFB5:
subq $8, %rsp
xorl %eax, %eax
call save_processor_state
movq %rsp, saved_context_esp(%rip)
movq %rax, saved_context_eax(%rip)
movq %rbx, saved_context_ebx(%rip)
movq %rcx, saved_context_ecx(%rip)
movq %rdx, saved_context_edx(%rip)
movq %rbp, saved_context_ebp(%rip)
movq %rsi, saved_context_esi(%rip)
movq %rdi, saved_context_edi(%rip)
movq %r8, saved_context_r08(%rip)
movq %r9, saved_context_r09(%rip)
movq %r10, saved_context_r10(%rip)
movq %r11, saved_context_r11(%rip)
movq %r12, saved_context_r12(%rip)
movq %r13, saved_context_r13(%rip)
movq %r14, saved_context_r14(%rip)
movq %r15, saved_context_r15(%rip)
pushfq ; popq saved_context_eflags(%rip)
movq $.L97, saved_rip(%rip)
movq %rsp,saved_rsp
movq %rbp,saved_rbp
movq %rbx,saved_rbx
movq %rdi,saved_rdi
movq %rsi,saved_rsi
addq $8, %rsp
movl $3, %edi
xorl %eax, %eax
jmp acpi_enter_sleep_state
.L97:
.p2align 4,,7
.L99:
.align 4
movl $24, %eax
movw %ax, %ds
movq saved_context+58(%rip), %rax
movq %rax, %cr4
movq saved_context+50(%rip), %rax
movq %rax, %cr3
movq saved_context+42(%rip), %rax
movq %rax, %cr2
movq saved_context+34(%rip), %rax
movq %rax, %cr0
pushq saved_context_eflags(%rip) ; popfq
movq saved_context_esp(%rip), %rsp
movq saved_context_ebp(%rip), %rbp
movq saved_context_eax(%rip), %rax
movq saved_context_ebx(%rip), %rbx
movq saved_context_ecx(%rip), %rcx
movq saved_context_edx(%rip), %rdx
movq saved_context_esi(%rip), %rsi
movq saved_context_edi(%rip), %rdi
movq saved_context_r08(%rip), %r8
movq saved_context_r09(%rip), %r9
movq saved_context_r10(%rip), %r10
movq saved_context_r11(%rip), %r11
movq saved_context_r12(%rip), %r12
movq saved_context_r13(%rip), %r13
movq saved_context_r14(%rip), %r14
movq saved_context_r15(%rip), %r15
xorl %eax, %eax
addq $8, %rsp
jmp restore_processor_state
.LFE5:
.Lfe5:
.size do_suspend_lowlevel,.Lfe5-do_suspend_lowlevel
.data
ALIGN
ENTRY(saved_rbp) .quad 0
ENTRY(saved_rsi) .quad 0
ENTRY(saved_rdi) .quad 0
ENTRY(saved_rbx) .quad 0
ENTRY(saved_rip) .quad 0
ENTRY(saved_rsp) .quad 0
ENTRY(saved_magic) .quad 0
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