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;
; POST power on self-test
;
; (C)1997-2001 Pascal Dornier / PC Engines; All rights reserved.
; This file is licensed pursuant to the COMMON PUBLIC LICENSE 0.5.
;
; pd 040325 extend temporary area (option TEMPSIZE)
; pd 021118 add disakbd / enakbd around PS/2 mouse detection
; (suggested by Klaus Pfaadt)
; pd 010429 change VGA_END to allow for large VGA BIOS (e.g.
; C&T / Asiliant VGA)
; pd 991021 add option for M-Systems DiskOnChip
#if ! def ROM_BEG
ROM_BEG equ 0c800h ;start of ROM scan
#endif
#if ! def ROM_END
ROM_END equ 0f800h ;end of ROM scan
#endif
#if ! def VGA_BEG
VGA_BEG equ 0c000h ;start of VGA BIOS scan
#endif
#if ! def VGA_END
VGA_END equ 0c800h ;end of VGA BIOS scan
#endif
;
; Reset entry
;
; Note: Processor shutdown is NOT supported. There are easier and
; faster ways to get out of protected mode.
;
reset: cli
cld
mov ax,cs ;SS = CS (to support fake stack)
mov ss,ax
mov ds,ax ;DS = CS (for easier table loads)
mov al,01h ;POST code: reset entry
ret_sp postcode
ret_sp cs_clr ;clear chipset registers to allow
;access to DMA, IRQ controller
ret_sp post_clr ;clear registers
;
; Initialize chipset
;
resetcs: mov al,02h ;POST code: chipset initialization
ret_sp postcode
ret_sp cs_init ;initialize chipset
rstini: jb rstvid ;:shadow already enabled
;
; Detect base memory size
;
mov al,03h ;POST code: detect base memory size
ret_sp postcode
ret_sp cs_det ;detect memory
rstdet: ;may return by RET or JMP
;
; Init shadow RAM - if DRAM is bad, we'll die here
; (running out of shadow makes for a more effective
; memory test, and accelerates startup).
;
mov al,04h ;POST code: initialize shadow RAM
ret_sp postcode
ret_sp cs_shad ;init shadow
rstshad2:
;
; Init Hercules video card (blind init, we don't care if it's there)
;
rstvid: mov al,05h ;POST code: init mono video
ret_sp postcode
#if ! def NO_VIDINIT
ret_sp vid_init ;let there be light ...
#endif
;
; disable all PCI adapters on primary bus -> get bus masters
; to shut up...
;
#if def PCI
rstpci: mov al,06h ;POST code: disable PCI devices
ret_sp postcode
ret_sp pci_rst
#endif
;
; Check low 64KB of DRAM
;
mov al,07h ;POST code: test low 64KB of DRAM
ret_sp postcode
ret_sp getunreal ;enter unreal mode
xor ebp,ebp ;start address
mov dx,[m_rstflg] ;save reset flag
ret_sp post_t64k ;test first 64K of DRAM
jnb rstmem5 ;:ok
mov al,0f7h ;POST code: low 64KB failure
jmp fatal ;handle fatal error
rstmem5: mov [m_rstflg],dx ;restore reset flag
;
; initialize stack
;
mov al,08h ;POST code: initialize stack
ret_sp postcode
mov sp,tmp_stack ;set stack
xor ax,ax
mov ss,ax
;
; Set CPU specific parameters, enable L1 cache
;
call cs_cpu ;DS = 0
;
; Check BIOS checksum
;
mov al,09h ;POST code: BIOS checksum
call postcode
call cs_shadrw ;set read/write shadow
call d_dosum ;update data checksum
call cs_shadro ;set read only shadow
#if ! def NO_ROMSUM
call post_sum ;verify BIOS checksum
call post_err ;hang if error
#endif
;
; Configure super I/O
;
mov al,0ah ;POST code: super I/O initialization
call postcode
call sio_init
;
; Clear RTC interrupts, test shutdown byte, set operating mode
;
mov al,0bh ;POST code: RTC test
call postcode
#if ! def RTC_SKIP
call rtc_test
#if ! def IGNORE_RTC
call post_err
#endif
#endif
;
; Test refresh (and indirectly, 8254 timer)
;
mov al,0ch ;POST code: refresh / 8254 test
call postcode
call post_ref
#if ! def IGNORE_REF
call post_err
#endif
;
; Set speed-dependent chipset registers
; (done after post_ref)
;
mov al,0dh ;POST code: speed-dependent chipset regs
call postcode
call cs_spd
;
; Test 8237 DMA registers
;
mov al,0eh ;POST code: test 8237 DMA
call postcode
#if ! def DMA_SKIP
call post_dma
call post_err
#endif
;
; Test DMA page registers
;
mov al,0fh ;POST code: test DMA page registers
call postcode
call post_page
call post_err
;
; Test 8254 registers
;
mov al,10h ;POST code: test 8254 registers
call postcode
call post_tim
call post_err
;
; Test keyboard controller (don't care whether we have a keyboard)
;
mov al,11h ;POST code: test keyboard controller
call postcode
call kb_ini
#if ! def NO_KBC
call post_err
#endif
;
; Initialize Timer, DMA, interrupt registers, port 92
;
mov al,12h ;POST code: init timer, DMA, 8259...
call postcode
call post_tdma
;
; Test 8259 interrupt mask registers
;
mov al,13h ;POST code: test 8259 mask registers
call postcode
call post_irq
call post_err
;
; Size and test low 640 KB
;
mov al,14h ;POST code: test low 640KB
call postcode
call post_base ;base memory test
;
; Initialize memory locations, interrupt vectors, etc.
;
mov al,15h ;POST code: init vectors
call postcode
call post_vec ;init interrupt vectors
call vid_vars ;initialize Hercules video BIOS vars
mov byte [m_devflg],00110000xb ;no floppy present, monochrome
#if def GX_VID
call gx_video ;initialize GX video
#endif
#if def GX_INT10
call gxv_init ;initialize GX int 10
#endif
#if def VID_CGA
call cs_cga ;enable CGA redirect
#endif
;
; run PCI plug & play
;
#if def PCI
mov al,16h ;POST code: PCI plug & play
call postcode
call cs_shadrw ;enable read / write shadow
#if def PCI_WAIT
xxx
mov bx,5000 ;option PCI_WAIT: give slow
call cs_waitbx ;PCI peripherals time to wake up
#endif
#if ! def SKIP_PNP
call pci_pnp
mov eax,(INTD shl 24)+(INTC shl 16)+(INTB shl 8)+INTA
call cs_pciint ;set interrupt channels
#endif
#endif
;
; shadow video BIOS (unless PCI already did it)
;
mov al,17h ;POST code: shadow video BIOS
call postcode
call cs_vshad
;
; Look for VGA video BIOS at C000
;
mov al,18h ;POST code: look for VGA BIOS
call postcode
mov bx,VGA_BEG ;starting address
mov dx,VGA_END ;ending address
call post_scan
mov ax,cs
cmp [vec10+2],ax ;did VGA initialize ?
jz rstmda ;:no, still same interrupt
mov byte [m_devflg],0 ;VGA
rstmda:
;
; Display signon prompt, base memory size
;
mov al,19h ;POST code: sign-on prompt
call postcode
#if def CONSOLE
call con_init ;initialize serial console
#endif
mov si,copyrt
call v_msg
xor eax,eax
mov ax,[m_lomem] ;memory size
call post_itoa ;display number
mov si,msg_base ;display " KB Base Memory"
call v_msg
;
; keyboard test #2
;
mov al,1ah ;POST code: second keyboard test
call postcode
call kb_inb
;
; Size and test extended memory
;
mov al,1bh ;POST code: extended memory test
call postcode
#if ! def SKIP_EXTEST
call cs_a20on ;enable A20 gate
call post_ext ;test extended memory
#endif
;
; keyboard test, enable timer tick, enable interrupts
;
mov al,1ch ;POST code: enable interrupts
call postcode
call kb_inc ;continue keyboard initialization
call tim_init ;initialize timer tick, unmask ints
sti ;enable interrupts
call kb_ind ;set keyboard LEDs
;
; test & init RTC
;
mov al,1dh ;POST code: test / init RTC
call postcode
call rtc_ini
;
; Initialize floppy disk: detect, spin up, recalibrate
;
mov al,1eh ;POST code: init floppy disk
call postcode
call fd_init
;
; ROM scan
;
#if ! def DISKONCHIP
mov al,1fh ;POST code: option ROM scan
call postcode
#if ! def NO_ROMSCAN
mov bx,ROM_BEG ;starting address
mov dx,ROM_END ;ending address
call post_scan
#endif
#endif
;
; Test & init parallel ports
;
mov al,20h ;POST code: test parallel ports
call postcode
call lp_test
;
; Test & init serial ports
;
mov al,21h ;POST code: test serial ports
call postcode
call rs_test
;
; enable numeric coprocessor
;
mov al,22h ;POST code: enable coprocessor
call postcode
call cs_npx
;
; secondary floppy init
;
mov al,23h ;POST code: floppy init
call postcode
call fd_inb
;
; IDE initialization
;
mov al,24h ;POST code: hard disk init
call postcode
call cs_shadrw ;set read/write shadow
call hd_init ;init disk drives
call d_dosum ;update data checksum
call cs_shadro ;set read only shadow
;
; Flash disk initialization
;
#if def FLASHDISK
call fld_init ;initialize flash disk
#endif
;
; ROM scan (alternate location for M-Systems DiskOnChip)
;
; Caution: their firmware version 3.3.5 will HANG if no HDD
; present. Connect a HDD, and update their boot image to
; DOC121.EXB or later.
;
#if def DISKONCHIP
mov al,1fh ;POST code: option ROM scan
call postcode
#if ! def NO_ROMSCAN
mov bx,ROM_BEG ;starting address
mov dx,ROM_END ;ending address
call post_scan
#endif
#endif
;
; detect PS/2 mouse
;
#if def PS2MOUSE
mov al,25h ;POST code: PS/2 mouse detect
call postcode
call ps2init ;initialize mouse
#endif
;
; Timer / RTC update check
;
; Note: This test can take up to one second (normally overlapped
; with floppy / IDE init), skip if not required.
;
mov al,26h ;POST code: timer/RTC check
call postcode
#if ! def NO_RTCFAIL
call tim_test
cmp byte [tmp_tim],0
rsttim: jnz rsttim ;hang if failure
#endif
;
; enable L2 cache if present
;
#if def cs_cache
mov al,27h
call postcode
call cs_cache
#endif
;
; OEM decision: verify diagnostic flags to decide
; whether to boot or display error messages
;
mov al,28h ;POST code: OEM boot decision point
call postcode
call decide
;
; clean up before boot
;
mov word [m_rstflg],0 ;clear reset flag
mov di,0500h ;clear temporary data area: 0500..11FF
#if ! def TEMPSIZE
TEMPSIZE equ 01200
#endif
mov cx,(TEMPSIZE-0500h) / 2
xor ax,ax
rep stosw ;this also overwrites stack !
;
; Boot operating system
;
mov al,00h ;POST code: boot
call postcode
#if def BOOTBEEP
call beep ;let there be noise
#endif
int 19h ;boot
mov al,0dfh ;we shouldn't get here
call postcode
cli
hlt ;hang
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