📄 nruntime.asm
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push ax
mov al,ds:[12h] ; 8042 input port byte
test al,00100000b ; diag switch on ? pin-32 of 8042
pop ax
jz timer_tick ; yes
jmp proc_shutdown ; shutdown proc
timer_tick:
;------ DO any special LED blinking ----;
push ax
mov al,20h ; end of interrupt
out 20h,al
pop ax
iret
;-----------------------------------------------------------------------;
; TIMER_INTERRUPT_INT8 ; Moved to OEMRUN.ASM
;-----------------------------------------------------------------------;
; KB_INTERRUPT_INT9 ;
;-----------------------------------------------------------------------;
; This routine will get control in every keyboard interrupt, any special;
; action can be done here. this is called from INT-9 ISR ;
; input : ;
; DS 40H ;
; other registers already saved using PUSHA, ES is not saved. ;
; register usage : can destroy any register except DS, ES ;
;-----------------------------------------------------------------------;
public kb_interrupt_int9
extrn kb_interrupt_int9_end:near
kb_interrupt_int9:
jmp kb_interrupt_int9_end
;-----------------------------------------------------------------------;
; POWER_ON_INIT ; Moved to RUNTIME.ASM
;-----------------------------------------------------------------------;
; HRESET_CLEAR ;
;-----------------------------------------------------------------------;
; If any initialization (e.g. detection CPU ID, etc.) is required in ;
; power on/hard reset path. ;
; input : ;
; SS = CS ;
; DX CPU ID information ;
; all other registers are undefined including DS,ES,SP,EBP ;
; stack not available ;
; register usage : can destroy any register execept SS ;
;-----------------------------------------------------------------------;
public hreset_clear
extrn hreset_clear_end:near
hreset_clear:
jmp hreset_clear_end
;-----------------------------------------------------------------------;
; SRESET_CLEAR ;
;-----------------------------------------------------------------------;
; If any initialization is required in <ctrl><alt><del> soft reset or ;
; shutdown path. ;
; input : ;
; SS = CS ;
; all other registers are undefined including DS,ES,SP,EBP ;
; stack not available ;
; register usage : can destroy any register execept SS ;
;-----------------------------------------------------------------------;
public sreset_clear ; soft reset init, if any
extrn sreset_clear_end:near
sreset_clear:
smsw ax
test al,01h ; virtual mode ?
jz sreset_clear_00 ; no..skip generating CPU reset
mov ax,008fh ; cmos reg 0Fh, shutdown code 00
ret_sp cmos_data_out_x
ret_sp enable_8042_bit_20 ; enable GateA20
jmp shutdown_cpu
sreset_clear_00:
jmp sreset_clear_end
;-----------------------------------------------------------------------;
; SHUTDOWN_7 ;
;-----------------------------------------------------------------------;
; This routine is used to come back to real mode from virtual mode. ;
; This shutdown code is not used by BIOS and can be used by porting if ;
; necessary. ;
; input : ;
; DS 0040h ;
; ES 0000h ;
; all registers are undefined ;
; stack available ;
;-----------------------------------------------------------------------;
public shutdown_7 ; can be used during memory config
extrn shutdown_77:near
shutdown_7:
jmp shutdown_77 ; USED IN MEMORY DETECTION
;-----------------------------------------------------------------------;
; SHUTDOWN_8 ;
;-----------------------------------------------------------------------;
; This routine is used to come back to real mode from virtual mode. ;
; This shutdown code is not used by BIOS and can be used by porting if ;
; necessary. ;
; input : ;
; DS 0040h ;
; ES 0000h ;
; all registers are undefined ;
; stack available ;
;-----------------------------------------------------------------------;
public shutdown_8 ; can be used during memory config
extrn shutdown_88:near
shutdown_8: ; user defined
jmp shutdown_88
;-----------------------------------------------------------------------;
; SHUTDOWN_INIT ;
;-----------------------------------------------------------------------;
; This routine is required if some special work involved during shutdown;
; processing before passing control to proper shutdown routine, ;
; example:- CR0, 287/387 bit set/reset, 287/387 emulation bit. ;
; input : ;
; SS = CS ;
; SI = shutdown code, (00..0A) ;
; stack not available ;
; output: ;
; none ;
; register usage : can destroy any register except SI ;
;-----------------------------------------------------------------------;
public shutdown_init ; any init during shutdown
extrn shutdown_init_end:near
extrn go_to_flat_mode_stack:near
extrn comeback_from_flat_mode_stack:near
extrn InitLocalApic:near
shutdown_init:
mov ax,si
cmp al,5
jz si_02 ; for shutdown 5,9,A
cmp al,9
jz si_02
cmp al,0ah
jnz si_00
si_02:
mov ax,30h
mov ss,ax ; set SS and SP
mov sp,100h
if (MKF_NCPU eq 2)
push si
call go_to_flat_mode_stack
call InitLocalApic
call comeback_from_flat_mode_stack
pop si
endif
call enable_l1_cache ; enable internal cache
si_00:
jmp shutdown_init_end
;-----------------------------------------------------------------------;
; SHUTDOWN_CPU ;
;-----------------------------------------------------------------------;
; this is called from INT-15 ISR ;
; this routine gets control if CPU type is 80286 which needs reset to go;
; to real mode. if you have fast CPU reset option through chipset reg. ;
; or any other mechanism, use that option else use standard shutdown ;
; (8042 command FE) ;
; input : ;
; none ;
; stack available ;
; register usage : can destroy any register ;
;-----------------------------------------------------------------------;
public shutdown_cpu ; shutdown processor
public shutdown_8042
shutdown_cpu:
cli
;-- here write the code for fast reset--;
shutdown_8042:
cli
; control may come here from SRESET_CLEAR where SS/SP is not set..
; so on-line coding is used..
mov al,0feh ; shutdown command to 8042
out 64h,al ; issue command
hlt ; goto system halt
jmp short $-1 ; ensure halt
;-----------------------------------------------------------------------;
; ENABLE_ADDR_BIT_20 ;
;-----------------------------------------------------------------------;
; this is called from INT-15 ISR. ;
; input : ;
; none ;
; stack available ;
; register usage : DO NOT destroy any register except AX, CX ;
;-----------------------------------------------------------------------;
public enable_addr_bit_20 ; fast GA20 enable
extrn enable_8042_bit_20:near
extrn enable_fast_ga20:near
enable_addr_bit_20:
mov ax,offset cgroup:enable_fast_ga20
mov cx,offset cgroup:enable_8042_bit_20
eab20_00:
test cgroup:misc_info,fast_gate_a20_bit
jz eab20_01 ; fast GA20 not allowed
push cx
call ax ; use Fast Gate20 method
pop cx
jz eab20_02 ; done
eab20_01:
call cx ; use 8042 method
eab20_02:
ret ; NZ/ZR = 0/1, error/no error
;-----------------------------------------------------------------------;
; DISABLE_ADDR_BIT_20 ;
;-----------------------------------------------------------------------;
; this is called from INT-15 ISR. ;
; input : ;
; none ;
; stack available ;
; register usage : DO NOT destroy any register except AX, CX ;
;-----------------------------------------------------------------------;
public disable_addr_bit_20 ; fast GA20 disable
extrn disable_8042_bit_20:near
extrn disable_fast_ga20:near
disable_addr_bit_20:
mov ax,offset cgroup:disable_fast_ga20
mov cx,offset cgroup:disable_8042_bit_20
jmp short eab20_00
;-----------------------------------------------------------------------;
; INT-15.ASM MODULE ;
; this routine is called from INT-15 ISR to support any special int-15 ;
; function if any. if you do not have any special func, simply return ;
; control to INT-15 ISR by RET. otherwise balance stack and return ;
; control to caller of INT-15 by IRET or RET 2. ;
; here is how INT-15 code will look like. ;
;int_15 proc far ;
; cmp ah,87h ;
; jz int_15_87 ;
; call special_int_15 ;
; ... ;
;int_15_87: ;
; ... ;
;int_15 endp ;
;=======================================================================;
; EXAMPLE: INT15 function to GATE-A20 support. ;
; input : (ah) 24h ;
; (al) 03h ;
; output: (ah) return code ;
; 00h successful ;
; 86h function not supported ;
; (NC) successful ;
; (CY) unsuccessful ;
; if successful ;
; (bx) bit 0..0 = GateA20 not supported on 8042;
; 1 = GateA20 supported on 8042 ;
; bit 1..0 = GateA20 not supported with ;
; bit-1 of I/O port 92H ;
; 1 = GateA20 supported with bit-1 ;
; of I/O port 92H ;
; Let us assume the chipset concerned has the support for GateA20 thru' ;
; bit-1 of I/O port 92H. In this case SPECIAL_INT_15 shoule be like as ;
; follows: ;
; ;
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