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|
PAGE
;-----------------------------------------------------------------------;
; GET_PARMS extracts parameters from the command line buffer ;
; ;
; On entry: all letters after 'Device=' have been changed ;
; to upper case ;
; ;
; On exit: (zf)=0 if syntax error ;
; if (zf)=1 then... ;
; ;
; EMM_START_BLOCK has been updated ;
; ;
; AX,BX,CX,DX,DI,SI,DS are destroyed ;
;-----------------------------------------------------------------------;
include xma2emsp.inc ; include parser things
include parse.asm
GET_PARMS PROC
LDS BX,CS:RH_PTRA ;make ds:bx point to request header
LDS SI,RH.RH0_BPBA ;make ds:si point to bios paramter buffer
CLD
mov cs:EMS_Pgs_Parm,E_Parm_Def ;default to all of memory ;an000; dms;
;-------------------------------------------------------------------
; parser support added by GGA
;-------------------------------------------------------------------
push cs ; make ES:DI point to parm block
pop es
lea di,p_block
xor cx,cx ; cx = 0, ordinal
xor dx,dx ; dx = 0, reserved
push ds ; save ds
get_args:
pop ds ; restore ds
call SysParse ; call the parser
cmp ax,0 ; end of line?
je check_frame ; no, find out what we got this time
cmp ax,-1 ; end of parse?
je end_of_input_line1 ; yes
cmp ax,-1 ; flag an error
ret ; return to caller
end_of_input_line1:
jmp end_of_input_line ;
; find out which arg was processed this time
check_frame:
; make ds point to data area for these comparisons, must restore before
; calling parser again
push ds ; save ds
push es ; make ds point to save areas
pop ds
cmp frame_result.$P_Type,2 ; was there a FRAME= in this pass?
jne check_p0 ; no, look for a P0
mov parse_flag,1 ; set parse flag
mov byte ptr frame_ctl+9,0 ; turn this off so we don't allow another
mov frame_result.$P_Type,0 ; clear this so we don't get fooled later
mov byte ptr p0_ctl+9,0 ; turn these off so we don't allow any
mov byte ptr p1_ctl+9,0 ; others that would conflict
mov byte ptr p2_ctl+9,0
mov byte ptr p3_ctl+9,0
push si ;save regs
mov si,word ptr frame_result.$P_Picked_Val[+0]
mov word ptr ds:[si+0],0 ;clear the
mov word ptr ds:[si+4],0 ; pages
mov word ptr ds:[si+8],0
mov word ptr ds:[si+12],0
pop si ;restore regs
; set flags for later code to fill in map_table
or page_flags,frame_flag ; set frame flag
jmp get_args ; go get another argument
check_p0:
cmp p0_result.$P_Type,2 ; was there a P0= in this pass?
jne check_p1 ; no, look for a P0
mov parse_flag,1 ; set parse flag
mov byte ptr p0_ctl+9,0 ; turn this off so we don't allow another
mov p0_result.$P_Type,0 ; clear this so we don't get fooled later
mov byte ptr frame_ctl+9,0 ; turn this off so we don't allow another
push si ;save regs
mov si,word ptr p0_result.$P_Picked_Val[+0]
mov word ptr ds:[si+0],0
pop si ;restore regs
; set flags for later code to fill in map_table
or page_flags,p0_flag ; set p0 flag
jmp get_args ; go get another argument
check_p1:
cmp p1_result.$P_Type,2 ; was there a p1= in this pass?
jne check_p2 ; no, look for a P2
mov parse_flag,1 ; set parse flag
mov byte ptr p1_ctl+9,0 ; turn this off so we don't allow another
mov p1_result.$P_Type,0 ; clear this so we don't get fooled later
mov byte ptr frame_ctl+9,0 ; turn this off so we don't allow another
push si ;save regs
mov si,word ptr p1_result.$P_Picked_Val[+0]
mov word ptr ds:[si+0],0
pop si ;restore regs
; set flags for later code to fill in map_table
or page_flags,p1_flag ; set p1 flag
jmp get_args ; go get another argument
check_p2:
cmp p2_result.$P_Type,2 ; was there a p2= in this pass?
jne check_p3 ; no, look for a p3
mov parse_flag,1 ; set parse flag
mov byte ptr p2_ctl+9,0 ; turn this off so we don't allow another
mov p2_result.$P_Type,0 ; clear this so we don't get fooled later
mov byte ptr frame_ctl+9,0 ; turn this off so we don't allow another
push si ;save regs
mov si,word ptr p2_result.$P_Picked_Val[+0]
mov word ptr ds:[si+0],0
pop si ;restore regs
; set flags for later code to fill in map_table
or page_flags,p2_flag ; set p2 flag
jmp get_args ; go get another argument
check_p3:
cmp p3_result.$P_Type,2 ; was there a p3= in this pass?
jne check_p254 ; no, look for a P254
mov parse_flag,1 ; set parse flag
mov byte ptr p3_ctl+9,0 ; turn this off so we don't allow another
mov p3_result.$P_Type,0 ; clear this so we don't get fooled later
mov byte ptr frame_ctl+9,0 ; turn this off so we don't allow another
push si ;save regs
mov si,word ptr p3_result.$P_Picked_Val[+0]
mov word ptr ds:[si+0],0
pop si ;restore regs
; set flags for later code to fill in map_table
or page_flags,p3_flag ; set p3 flag
jmp get_args ; go get another argument
check_p254:
cmp p254_result.$P_Type,2 ; was there a p254= in this pass?
jne check_p255 ; no, look for a P255
mov parse_flag,1 ; set parse flag
mov byte ptr p254_ctl+9,0 ; turn this off so we don't allow another
mov p254_result.$P_Type,0 ; clear this so we don't get fooled later
push si ;save regs
mov si,word ptr p254_result.$P_Picked_Val[+0]
mov word ptr ds:[si+0],0
pop si ;restore regs
; set flags for later code to fill in map_table
or page_flags,p254_flag ; set p254 flag
jmp get_args ; go get another argument
check_p255:
cmp p255_result.$P_Type,2 ; was there a P255= in this pass?
je do_p255 ; yes, process it
jmp Check_X ; no, find out if /X was included
do_p255:
mov parse_flag,1 ; set parse flag
mov byte ptr p255_ctl+9,0 ; turn this off so we don't allow another
mov p255_result.$P_Type,0 ; clear this so we don't get fooled later
push si ;save regs
mov si,word ptr p255_result.$P_Picked_Val[+0]
mov word ptr ds:[si+0],0
pop si ;restore regs
; set flags for later code to fill in map_table
or page_flags,p255_flag ; set p255 flag
jmp get_args ; go get another argument
Check_X:
cmp es:X_Result.$P_SYNONYM_Ptr,offset es:X_Switch.$P_KeyorSW ; switch Ptr ;an000; dms;
je Do_X ; yes, process it
jmp get_args ; no, must have been the positional, ignore it and go on
Do_X:
push ax ; save regs
mov ax,es:word ptr X_Result.$P_Picked_Val ;get low word of result ;an000; dms;
mov cs:EMS_Pgs_Parm,ax ; pass to program ;an000; dms;
pop ax ; restore regs
jmp get_args ; go get another argument
; getting here means invalid argument, figure out what to do later
end_of_input_line:
cmp parse_flag,null ; were there command line args?
jne cmd_line_args ; yes, process them
jmp null_cmd_line ; no, skip processing
cmd_line_args:
; put the stuff into map_table, this is done by looking at flags set
; by the above code and putting the addresses into map_table
push ax ; save some regs
push bx
push cx
push dx
push di
xor di,di ; clear index pointer
mov map_count,null ; clear map count default
test page_flags,frame_flag ; was FRAME= included?
jz chk_p0 ; no, try p0
; yes, fix up page count and fill in map_table
mov map_count,4 ; FRAME= takes up 4 map entries
; convert the item tag into a segment address
xor ah,ah ; make 0
mov al,frame_result.$P_Item_Tag ; get item tag
mov cx,8 ; need to shift left eight bits
shl ax,cl ; to convert to a segment address
; do some math with di
xor di,di ; clear index pointer
; save the segment addresses in map_table
mov map_table.phys_page_segment[di],ax ; store p0 segment
mov map_table.phys_page_number[di],0 ; p0 page number
mov cs:Page_Frame_Sta,ax ;save our page for XMA1 ;an000; dms;
; diags.
add ax,400h ; increase segment ID by 16K
add di,type mappable_phys_page_struct
mov map_table.phys_page_segment[di],ax ; store p1 segment
mov map_table.phys_page_number[di],1 ; p1 page number
add ax,400h ; increase segment ID by 16K
add di,type mappable_phys_page_struct
mov map_table.phys_page_segment[di],ax ; store p2 segment
mov map_table.phys_page_number[di],2 ; p2 page number
add ax,400h ; increase segment ID by 16K
add di,type mappable_phys_page_struct
mov map_table.phys_page_segment[di],ax ; store p3 segment
mov map_table.phys_page_number[di],3 ; p3 page number
; do some math with di, this will be used as a pointer into map_table
add di,type mappable_phys_page_struct
jmp chk_p254 ; FRAME= implies that p0 - p3 were not present,
; skip ahead and look for p254 and p255
; check for p0
chk_p0:
test page_flags,p0_flag ; was p0= included?
jz chk_p1 ; no, try p1
; yes, fix up page count and fill in map_table
add map_count,1 ; one extra map entry
; convert the item tag into a segment address
xor ah,ah ; make 0
mov al,p0_result.$P_Item_Tag; get item tag
mov cx,8 ; need to shift left eight bits
shl ax,cl ; to convert to a segment address
; save the segment addresses in map_table
mov map_table.phys_page_segment[di],ax ; store p0 segment
mov map_table.phys_page_number[di],0 ; p0 page number
mov cs:Page_Frame_Sta,ax ;save our page for XMA1 ;an000; dms;
; diags.
; do some math with di, this will be used as a pointer into map_table
add di,type mappable_phys_page_struct
;------------------------
; check for p1
;------------------------
chk_p1:
test page_flags,p1_flag ; was p1= included?
jz chk_p2 ; no, try p2
; yes, fix up page count and fill in map_table
add map_count,1 ; one extra map entry
; convert the item tag into a segment address
xor ah,ah ; make 0
mov al,p1_result.$P_Item_Tag; get item tag
mov cx,8 ; need to shift left eight bits
shl ax,cl ; to convert to a segment address
; save the segment addresses in map_table
mov map_table.phys_page_segment[di],ax ; store p1 segment
mov map_table.phys_page_number[di],1 ; p0 page number
mov cs:Page_Frame_Sta,ax ;save our page for XMA1 ;an000; dms;
; diags.
; do some math with di, this will be used as a pointer into map_table
add di,type mappable_phys_page_struct
;------------------------
; check for p2
;------------------------
chk_p2:
test page_flags,p2_flag ; was p2= included?
jz chk_p3 ; no, try p3
; yes, fix up page count and fill in map_table
add map_count,1 ; one extra map entry
; convert the item tag into a segment address
xor ah,ah ; make 0
mov al,p2_result.$P_Item_Tag; get item tag
mov cx,8 ; need to shift left eight bits
shl ax,cl ; to convert to a segment address
; save the segment addresses in map_table
mov map_table.phys_page_segment[di],ax ; store p2 segment
mov map_table.phys_page_number[di],2 ; p2 page number
mov cs:Page_Frame_Sta,ax ;save our page for XMA1 ;an000; dms;
; diags.
; do some math with di, this will be used as a pointer into map_table
add di,type mappable_phys_page_struct
;------------------------
; check for p3
;------------------------
chk_p3:
test page_flags,p3_flag ; was p3= included?
jz chk_p254 ; no, try p254
; yes, fix up page count and fill in map_table
add map_count,1 ; one extra map entry
; convert the item tag into a segment address
xor ah,ah ; make 0
mov al,p3_result.$P_Item_Tag; get item tag
mov cx,8 ; need to shift left eight bits
shl ax,cl ; to convert to a segment address
; save the segment addresses in map_table
mov map_table.phys_page_segment[di],ax ; store p3 segment
mov map_table.phys_page_number[di],3 ; p3 page number
mov cs:Page_Frame_Sta,ax ;save our page for XMA1 ;an000; dms;
; diags.
; do some math with di, this will be used as a pointer into map_table
add di,type mappable_phys_page_struct
;------------------------
; check for p254
;------------------------
chk_p254:
test page_flags,p254_flag ; was p254= included?
jz chk_p255 ; no, try p255
; yes, fix up page count and fill in map_table
add map_count,1 ; one extra map entry
; convert the item tag into a segment address
xor ah,ah ; make 0
mov al,p254_result.$P_Item_Tag; get item tag
mov cx,8 ; need to shift left eight bits
shl ax,cl ; to convert to a segment address
; save the segment addresses in map_table
mov map_table.phys_page_segment[di],ax ; store p254 segment
mov map_table.phys_page_number[di],0feh ; p254 page number
mov cs:Page_Frame_Sta,ax ;save our page for XMA1 ;an000; dms;
; diags.
; do some math with di, this will be used as a pointer into map_table
add di,type mappable_phys_page_struct
;------------------------
; check for p255
;------------------------
chk_p255:
test page_flags,p255_flag ; was p255= included?
jz Chk_X ; no, /X switch
; yes, fix up page count and fill in map_table
add map_count,1 ; one extra map entry
; convert the item tag into a segment address
xor ah,ah ; make 0
mov al,p255_result.$P_Item_Tag; get item tag
mov cx,8 ; need to shift left eight bits
shl ax,cl ; to convert to a segment address
; save the segment addresses in map_table
mov map_table.phys_page_segment[di],ax ; store p255 segment
mov map_table.phys_page_number[di],0ffh ; p255 page number
mov cs:Page_Frame_Sta,ax ;save our page for XMA1 ;an000; dms;
; diags.
; do some math with di, this will be used as a pointer into map_table
add di,type mappable_phys_page_struct
Chk_X:
pop di ; restore some regs
pop dx
pop cx
pop bx
pop ax
null_cmd_line:
CMP AL,AL ; else set zf to indicate no error
ret ; return to calling routine
GET_PARMS ENDP
|
