.text
#include <linux/linkage.h>
#include <asm/segment.h>
-#include <asm/pgtable.h>
-#include <asm/page.h>
+#include <asm/pgtable_types.h>
+#include <asm/page_types.h>
#include <asm/msr.h>
#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)
+ 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
movq saved_rip, %rax
jmp *%rax
+ENDPROC(wakeup_long64)
-.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
+ jmp bogus_64_magic
-# 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:
+ENTRY(do_suspend_lowlevel)
subq $8, %rsp
xorl %eax, %eax
call save_processor_state
pushfq
popq pt_regs_flags(%rax)
- movq $.L97, saved_rip(%rip)
+ movq $resume_point, saved_rip(%rip)
movq %rsp, saved_rsp
movq %rbp, saved_rbp
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
+ call acpi_enter_sleep_state
+ /* in case something went wrong, restore the machine status and go on */
+ jmp resume_point
+ .align 4
+resume_point:
/* We don't restore %rax, it must be 0 anyway */
movq $saved_context, %rax
movq saved_context_cr4(%rax), %rbx
xorl %eax, %eax
addq $8, %rsp
jmp restore_processor_state
-.LFE5:
-.Lfe5:
- .size do_suspend_lowlevel,.Lfe5-do_suspend_lowlevel
-
+ENDPROC(do_suspend_lowlevel)
+
.data
-ALIGN
ENTRY(saved_rbp) .quad 0
ENTRY(saved_rsi) .quad 0
ENTRY(saved_rdi) .quad 0
git.openpandora.org / pandora-kernel.git / blobdiff