BIOS源代码

2021年2月13日发(作者：ploy)

PAGE

,132

title . PROCESSOR_TIMER_PARITY_REFRESH_NMI TEST

;************************************************ *****************;

;******************* **********************************************;

;** **;

;** (C)Copyright 1985-1996, American Megatrends Inc. **;

;** **;

;** All Rights Reserved. **;

;** **;

;** 6145-F, Northbelt Parkway, Norcross, **;

;** **;

;** Georgia - 30071, USA. Phone-(770)-246-8600. **;

;** **;

;********************************** *******************************;

;***** ************************************************** **********;

;-------------------------- -------------;

include bios global constants

include bios coding macro definition

include

; ---------------------------------------;

extrn check_point_no_stack:near

extrn check_point_stack:near

public bios_suru

public shutdown_0

public shutdown_77

public shutdown_88

extrn shutdown_1:near shutdown after memory error

extrn shutdown_2:near v_mode exception intr error

extrn _shutdown_33:near shutdown after memory test

extrn shutdown_4:near boot loader request shutdown

extrn shutdown_5:near ; user defined shutdown routine

extrn _shutdown_66:near shutdown during memory test to display memory size

extrn shutdown_7:near unused, (chipset memory detection)

extrn shutdown_8:near unused, (soft reset)

extrn shutdown_9:near shutdown after block move

extrn shutdown_a:near user defined shutdown routine

extrn init_8259_80287:near shut 4/5, init 8259, 80287

extrn disable_video:near

extrn clear_64k_memory:near

extrn int_isr:near

extrn _power_on_delay:byte

extrn _software_delay:byte

extrn ram_segment:word

extrn flush_all_cache:near

extrn power_on_init:near

public power_on_init_end

extrn hreset_clear:near

public hreset_clear_end

extrn sreset_clear:near

public sreset_clear_end

extern StopUsbHostController(dummy_ret):near

extrn dummy_ret:near

extrn disable_all_cache:near

extrn shutdown_init:near

public shutdown_init_end

extrn decompress_post_init:near

;------------ ---------------------------;

; C O D E

S E G M E N T

;----------- ----------------------------;

cgroup group _text

_text segment word public 'CODE'

assume cs:cgroup

.486p

;--------------------- ------------------;

public _BIOS_STARTS

_BIOS_STARTS label byte marks start of module

;---------------- -----------------------;

; FLAGS TEST (SF,ZF,PF,CF)

;

;---;---;---;---;---;---;---;---;

;

; S Z x A x P ; x C

;

;---;---;---;---;---;---;---;---;

;

HARD RESET OR SHUTDOWN RESET

;------------------------------ ---------;

; SHUTDOWN PROCESSING

;---------------------------------------;

bios_suru:

cli test under CLI mode

cld ensure direction

mov ax,cs

mov ss,ax

; $$$$$$CORE0036+ >>>

extern wake_up(wake_up_end):near

public wake_up_end

jmp wake_up check for wakeup

wake_up_end: control will come here only if wake up is not needed

; $$$$$$CORE0036+ <<<

jmp power_on_init

power_on_init_end:

in al,kb_stat_port if sys_flag bit is set

test al,00000100b then soft reset else power on

jnz shut_5 not power-on

;----------------------------- ----------;

; VANILLA MEMORY PATCH < /p>

;--------------------------------------- ;

ifdef VANILLA_BIOS

;------ ---------------------------------;

;

save CPUID in cmos 35h(DL), 36h(DH)

extrn cmos_data_out:near

extrn _refresh_value:byte

mov ebp,edx

mov al,0b5h

mov ah,dl

ret_sp cmos_data_out

mov al,0b6h

mov ah,dh

ret_sp cmos_data_out

;

start memory refresh..

mov al,00h initialise DMA-PAGE reg.

out 8fh,al ; (used in MEMORY REFRESH)

io_delay

mov al,01010100b start CH_1 (REFRESH)

out 43h,al one byte count used

io_delay

mov al,cgroup:_refresh_value; low byte count

OUT

41H,AL

MOV

CX,100H

; 400h..01/11/95

XOR

DI,DI

MOV

ES,DI

wpulse1:

stosb

loop wpulse1

;------------------------- --------------;

extrn vanilla_patch_offset:near

cmp cgroup:word ptr vanilla_patch_offset,0ffffh

jz ret_off no routine

mov sp,offset cgroup:sp_ret_off

jmp vanilla_patch_offset-1

even

sp_ret_off:

dw offset cgroup:ret_off

dw 0f000h

ret_off:

endif

;- --------------------------------------;

jmp hreset_clear hard reset init (if any)

;;;;hreset_clear_end:

;;;; jmp shutdown_0x hard reset, goto regs. test

shut_5:

jmp sreset_clear GA20 disable and other....

sreset_clear_end:

mov al,8fh shutdown address

out cmos_addr_port,al mask NMI & select shut byte

jcxz short $$+2 i/o delay

jcxz short $$+2 i/o delay

IN

AL,CMOS_DATA_PORT

; read shutdown code

mov ah,00

MOV

SI,AX

; save in (SI)

MOV

AL,8FH

; shutdown address

JCXZ

SHORT $$+2

; i/o delay

OUT

CMOS_ADDR_PORT,AL

mov al,00 ; clear shutdown byte

jcxz short $$+2 ; i/o delay

jcxz short $$+2 i/o delay

out cmos_data_port,al

mov ax,cs

mov ss,ax

mov ax,si restore shutdown code

cmp al,04h for BOOT loader shutdown

jz shut_1 & for USER defined shutdown

cmp al,05h initialize 8259 (#1, #2)

jz shut_1 and (DS), (SS), (SP), STI

cmp al,0ah ; if shut code > 10

jbe shut_2 bypass intr. init

jmp short shutdown_0 ; then hard reset

;-------------------- -------------------;

; INIT 8259 for SHUTDOWN 04, 05

;-------------------- -------------------;

shut_1:

mov bx,level_2_int*256+level_1_int

ret_sp init_8259_80287 shut 4/5, init 8259, 80287

;--------------------- ------------------;

; INTERNAL CACHE IS ALWAYS ON

;-------------------------- -------------;

shut_2:

jmp shutdown_init

shutdown_init_end:

mov ax,40h global data segment (ah) = 0

mov ds,ax setup (DS)

mov al,00h global extra segment (ah) = 0

mov es,ax setup (ES)

mov al,30h global stack segment (ah) = 0

mov ss,ax setup (SS)

mov sp,0100h setup (SP)

shl si,1 prepare index

jmp [si+cgroup:shut_jmp_tbl]; brunch with intr. disabled

;----------------------------- ----------;

; SHUTDOWN JMP TABLE

;---------------------------------------;

even

shut_jmp_tbl label word

dw offset cgroup:shutdown_0; hard reset

dw offset cgroup:shutdown_1; used for block move internal shutdown

dw offset cgroup:shutdown_2; v_mode exception intr error

dw offset cgroup:_shutdown_33; shutdown after memory test

dw offset cgroup:shutdown_4; shutdown for boot loader

dw offset cgroup:shutdown_5; shutdown (with intr. init)

dw offset cgroup:_shutdown_66; shutdown during memory test to display memory size

dw offset cgroup:shutdown_7; unused, (chipset memory detection)

dw offset cgroup:shutdown_8; unused, (soft reset)

dw offset cgroup:shutdown_9; shutdown after block move

dw offset cgroup:shutdown_a; shutdown (w/o intr. init)

< p>
;---------------------------------------;

hreset_clear_end:

shutdown_0x: hard reset

mov al,8dh

out cmos_addr_port,al NMI OFF

;---------- -----------------------------;

shutdown_0: hard reset

shutdown_77: unused

shutdown_88: unused

check_point_si 03h ======== 03

mov ax,cs

mov ss,ax

xor bp,bp

mov ds,bp set (DS) = 0

mov es,bp set (ES) = 0

jmp_di disable_video

in al,kb_stat_port if sys_flag bit is set

test al,00000100b ; then soft reset else power on

jz not_cnt_alt_del power on