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318 lines
6.3 KiB
318 lines
6.3 KiB
.text
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#include <linux/linkage.h>
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#include <asm/segment.h>
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#include <asm/page.h>
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#
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# wakeup_code runs in real mode, and at unknown address (determined at run-time).
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# Therefore it must only use relative jumps/calls.
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#
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# Do we need to deal with A20? It is okay: ACPI specs says A20 must be enabled
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#
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# If physical address of wakeup_code is 0x12345, BIOS should call us with
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# cs = 0x1234, eip = 0x05
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#
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ALIGN
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.align 4096
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ENTRY(wakeup_start)
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wakeup_code:
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wakeup_code_start = .
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.code16
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movw $0xb800, %ax
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movw %ax,%fs
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movw $0x0e00 + 'L', %fs:(0x10)
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cli
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cld
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# setup data segment
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movw %cs, %ax
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movw %ax, %ds # Make ds:0 point to wakeup_start
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movw %ax, %ss
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mov $(wakeup_stack - wakeup_code), %sp # Private stack is needed for ASUS board
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movw $0x0e00 + 'S', %fs:(0x12)
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pushl $0 # Kill any dangerous flags
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popfl
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movl real_magic - wakeup_code, %eax
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cmpl $0x12345678, %eax
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jne bogus_real_magic
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testl $1, video_flags - wakeup_code
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jz 1f
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lcall $0xc000,$3
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movw %cs, %ax
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movw %ax, %ds # Bios might have played with that
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movw %ax, %ss
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1:
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testl $2, video_flags - wakeup_code
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jz 1f
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mov video_mode - wakeup_code, %ax
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call mode_set
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1:
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# set up page table
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movl $swapper_pg_dir-__PAGE_OFFSET, %eax
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movl %eax, %cr3
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testl $1, real_efer_save_restore - wakeup_code
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jz 4f
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# restore efer setting
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movl real_save_efer_edx - wakeup_code, %edx
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movl real_save_efer_eax - wakeup_code, %eax
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mov $0xc0000080, %ecx
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wrmsr
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4:
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# make sure %cr4 is set correctly (features, etc)
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movl real_save_cr4 - wakeup_code, %eax
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movl %eax, %cr4
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movw $0xb800, %ax
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movw %ax,%fs
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movw $0x0e00 + 'i', %fs:(0x12)
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# need a gdt
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lgdt real_save_gdt - wakeup_code
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movl real_save_cr0 - wakeup_code, %eax
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movl %eax, %cr0
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jmp 1f
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1:
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movw $0x0e00 + 'n', %fs:(0x14)
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movl real_magic - wakeup_code, %eax
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cmpl $0x12345678, %eax
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jne bogus_real_magic
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ljmpl $__KERNEL_CS,$wakeup_pmode_return
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real_save_gdt: .word 0
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.long 0
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real_save_cr0: .long 0
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real_save_cr3: .long 0
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real_save_cr4: .long 0
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real_magic: .long 0
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video_mode: .long 0
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video_flags: .long 0
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real_efer_save_restore: .long 0
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real_save_efer_edx: .long 0
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real_save_efer_eax: .long 0
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bogus_real_magic:
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movw $0x0e00 + 'B', %fs:(0x12)
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jmp bogus_real_magic
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/* This code uses an extended set of video mode numbers. These include:
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* Aliases for standard modes
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* NORMAL_VGA (-1)
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* EXTENDED_VGA (-2)
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* ASK_VGA (-3)
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* Video modes numbered by menu position -- NOT RECOMMENDED because of lack
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* of compatibility when extending the table. These are between 0x00 and 0xff.
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*/
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#define VIDEO_FIRST_MENU 0x0000
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/* Standard BIOS video modes (BIOS number + 0x0100) */
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#define VIDEO_FIRST_BIOS 0x0100
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/* VESA BIOS video modes (VESA number + 0x0200) */
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#define VIDEO_FIRST_VESA 0x0200
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/* Video7 special modes (BIOS number + 0x0900) */
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#define VIDEO_FIRST_V7 0x0900
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# Setting of user mode (AX=mode ID) => CF=success
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mode_set:
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movw %ax, %bx
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#if 0
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cmpb $0xff, %ah
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jz setalias
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testb $VIDEO_RECALC>>8, %ah
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jnz _setrec
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cmpb $VIDEO_FIRST_RESOLUTION>>8, %ah
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jnc setres
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cmpb $VIDEO_FIRST_SPECIAL>>8, %ah
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jz setspc
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cmpb $VIDEO_FIRST_V7>>8, %ah
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jz setv7
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#endif
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cmpb $VIDEO_FIRST_VESA>>8, %ah
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jnc check_vesa
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#if 0
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orb %ah, %ah
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jz setmenu
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#endif
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decb %ah
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# jz setbios Add bios modes later
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setbad: clc
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ret
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check_vesa:
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subb $VIDEO_FIRST_VESA>>8, %bh
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orw $0x4000, %bx # Use linear frame buffer
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movw $0x4f02, %ax # VESA BIOS mode set call
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int $0x10
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cmpw $0x004f, %ax # AL=4f if implemented
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jnz _setbad # AH=0 if OK
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stc
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ret
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_setbad: jmp setbad
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.code32
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ALIGN
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.org 0x800
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wakeup_stack_begin: # Stack grows down
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.org 0xff0 # Just below end of page
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wakeup_stack:
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ENTRY(wakeup_end)
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.org 0x1000
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wakeup_pmode_return:
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movw $__KERNEL_DS, %ax
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movw %ax, %ss
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %fs
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movw %ax, %gs
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movw $0x0e00 + 'u', 0xb8016
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# reload the gdt, as we need the full 32 bit address
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lgdt saved_gdt
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lidt saved_idt
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lldt saved_ldt
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ljmp $(__KERNEL_CS),$1f
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1:
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movl %cr3, %eax
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movl %eax, %cr3
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wbinvd
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# and restore the stack ... but you need gdt for this to work
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movl saved_context_esp, %esp
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movl %cs:saved_magic, %eax
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cmpl $0x12345678, %eax
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jne bogus_magic
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# jump to place where we left off
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movl saved_eip,%eax
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jmp *%eax
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bogus_magic:
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movw $0x0e00 + 'B', 0xb8018
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jmp bogus_magic
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##
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# acpi_copy_wakeup_routine
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#
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# Copy the above routine to low memory.
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#
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# Parameters:
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# %eax: place to copy wakeup routine to
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#
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# Returned address is location of code in low memory (past data and stack)
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#
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ENTRY(acpi_copy_wakeup_routine)
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sgdt saved_gdt
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sidt saved_idt
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sldt saved_ldt
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str saved_tss
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movl nx_enabled, %edx
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movl %edx, real_efer_save_restore - wakeup_start (%eax)
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testl $1, real_efer_save_restore - wakeup_start (%eax)
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jz 2f
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# save efer setting
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pushl %eax
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movl %eax, %ebx
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mov $0xc0000080, %ecx
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rdmsr
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movl %edx, real_save_efer_edx - wakeup_start (%ebx)
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movl %eax, real_save_efer_eax - wakeup_start (%ebx)
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popl %eax
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2:
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movl %cr3, %edx
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movl %edx, real_save_cr3 - wakeup_start (%eax)
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movl %cr4, %edx
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movl %edx, real_save_cr4 - wakeup_start (%eax)
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movl %cr0, %edx
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movl %edx, real_save_cr0 - wakeup_start (%eax)
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sgdt real_save_gdt - wakeup_start (%eax)
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movl saved_videomode, %edx
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movl %edx, video_mode - wakeup_start (%eax)
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movl acpi_video_flags, %edx
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movl %edx, video_flags - wakeup_start (%eax)
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movl $0x12345678, real_magic - wakeup_start (%eax)
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movl $0x12345678, saved_magic
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ret
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.data
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ALIGN
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ENTRY(saved_magic) .long 0
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ENTRY(saved_eip) .long 0
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save_registers:
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leal 4(%esp), %eax
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movl %eax, saved_context_esp
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movl %ebx, saved_context_ebx
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movl %ebp, saved_context_ebp
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movl %esi, saved_context_esi
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movl %edi, saved_context_edi
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pushfl ; popl saved_context_eflags
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movl $ret_point, saved_eip
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ret
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restore_registers:
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movl saved_context_ebp, %ebp
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movl saved_context_ebx, %ebx
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movl saved_context_esi, %esi
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movl saved_context_edi, %edi
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pushl saved_context_eflags ; popfl
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ret
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ENTRY(do_suspend_lowlevel)
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call save_processor_state
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call save_registers
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pushl $3
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call acpi_enter_sleep_state
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addl $4, %esp
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ret
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.p2align 4,,7
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ret_point:
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call restore_registers
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call restore_processor_state
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ret
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ENTRY(do_suspend_lowlevel_s4bios)
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call save_processor_state
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call save_registers
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call acpi_enter_sleep_state_s4bios
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ret
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ALIGN
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# saved registers
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saved_gdt: .long 0,0
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saved_idt: .long 0,0
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saved_ldt: .long 0
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saved_tss: .long 0
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