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This commit is contained in:
Dennis Yurichev 2015-08-13 06:16:59 +03:00
commit 897e853a42
16 changed files with 102 additions and 102 deletions
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8
src/chapter-03.md
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@ -350,9 +350,9 @@ ZTimerOff proc near
; timer interrupt.
;
mov al,00001010b ; OCW3, set up to read
out OCW3,al; Int errupt Request register
out OCW3,al ; Interrupt Request register
DELAY
ina l,IRR; read Interrupt Request
in al,IRR ; read Interrupt Request
; register
and al,1 ; set AL to 1 if IRQ0 (the
; timer interrupt) is pending
@ -1509,7 +1509,7 @@ ZTimerOn proc near
; Restore the context of the program being timed and return to it.
;
MPOPF
popax
pop ax
ret
ZTimerOn endp
@ -1674,7 +1674,7 @@ ReferenceZTimerOn proc near
; Restore the context of the program being timed and return to it.
;
MPOPF
popax
pop ax
ret
ReferenceZTimerOn endp

20
src/chapter-09.md
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@ -213,13 +213,13 @@ display modes):
```nasm
SHL AX,1 ;*2
SH LAX,1 ;*4
SH LAX,1 ;*8
SH LAX,1 ;*16
MO VBX,AX
SH LAX,1 ;*32
SH LAX,1 ;*64
ADD AX,BX ;*80
SHL AX,1 ;*4
SHL AX,1 ;*8
SHL AX,1 ;*16
MOV BX,AX
SHL AX,1 ;*32
SHL AX,1 ;*64
ADD AX,BX ;*80
```
Using `LEA` on the 386, the above could be reduced to
@ -242,7 +242,7 @@ Of course, on the 386, the shift and add version could also be reduced
to this considerably more efficient code:
```nasm
SH LAX,4 ;*16
SHL AX,4 ;*16
MOV BX,AX
SHL AX,2 ;*64
ADD AX,BX ;*80
@ -766,9 +766,9 @@ _Divprocnear
sub dx,dx ;convert initial divisor word to a 32-bit
;value for DIV
DivLoop:
lod sw ;get next most significant word of divisor
lodsw ;get next most significant word of divisor
div bx
sto sw ;save this word of the quotient
stosw ;save this word of the quotient
;DX contains the remainder at this point,
; ready to prepend to the next divisor word
loop DivLoop

2
src/chapter-12.md
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@ -346,7 +346,7 @@ For example, you'd certainly expect a sequence such as
pop ax
ret
pop ax
et
ret
:
```

2
src/chapter-28.md
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@ -410,7 +410,7 @@ Start proc near
mov al,1 ;blue is color 1
call SelectSetResetColor ;set to draw in blue
mov ax,VGA_SEGMENT
move s,ax
mov es,ax
sub di,di
mov cx,7000h
rep stosb ;the value written actually doesn't

2
src/chapter-29.md
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@ -262,7 +262,7 @@ RestoreTheScreen:
RestoreLoop:
mov dx,SC_INDEX
mov al,MAP_MASK ;set SC Index to Map Mask register
outdx,al
out dx,al
inc dx
mov cl,[Plane] ;get the # of the plane we want
; to restore

4
src/chapter-30.md
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@ -810,7 +810,7 @@ RowLoop:
mov cx,LOGICAL_SCREEN_WIDTH/8/4
;fill 1 scan line
ColumnLoop:
sto sw ;draw part of a diagonal line
stosw ;draw part of a diagonal line
mov word ptr es:[di],0 ;make vertical blank spaces so
; panning effects can be seen easily
inc di
@ -832,7 +832,7 @@ RowLoop2:
mov cx,LOGICAL_SCREEN_WIDTH/8/4
;fill 1 scan line
ColumnLoop2:
sto sw ;draw part of a diagonal line
stosw ;draw part of a diagonal line
mov word ptr es:[di],0 ;make vertical blank spaces so
; panning effects can be seen easily
inc di

24
src/chapter-31.md
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@ -373,22 +373,22 @@ Set320By400Mode proc near
mov al,MEMORY_MODE
out dx,al
inc dx
ina l,dx
in al,dx
and al,not 08h ;turn off chain 4
ora l,04h ;turn off odd/even
or al,04h ;turn off odd/even
out dx,al
mov dx,GC_INDEX
mov al,GRAPHICS_MODE
out dx,al
inc dx
ina l,dx
in al,dx
and al,not 10h ;turn off odd/even
out dx,al
dec dx
mov al,MISCELLANEOUS
out dx,al
inc dx
ina l,dx
in al,dx
and al,not 02h ;turn off chain
out dx,al
;
@ -677,14 +677,14 @@ stack ends
;
OUT_WORDmacro
if WORD_OUTS_OK
outdx,ax
out dx,ax
else
out dx,al
inc dx
xch gah,al
xchg ah,al
out dx,al
dec dx
xch gah,al
xchg ah,al
endif
endm
;
@ -777,22 +777,22 @@ Set320By400Modeprocnear
mov al,MEMORY_MODE
out dx,al
inc dx
ina l,dx
in al,dx
and al,not 08h ;turn off chain 4
ora l,04h ;turn off odd/even
or al,04h ;turn off odd/even
out dx,al
mov dx,GC_INDEX
mov al,GRAPHICS_MODE
out dx,al
inc dx
ina l,dx
in al,dx
and al,not 10h ;turn off odd/even
out dx,al
dec dx
mov al,MISCELLANEOUS
out dx,al
inc dx
ina l,dx
in al,dx
and al,not 02h ;turn off chain
out dx,al
;
@ -830,7 +830,7 @@ CONSTANT_TO_INDEXED_REGISTER SC_INDEX,MAP_MASK,0fh
mov al,UNDERLINE
out dx,al
inc dx
ina l,dx
in al,dx
and al,not40h ;turn off doubleword
out dx,al
dec dx

2
src/chapter-34.md
View file

@ -390,7 +390,7 @@ RowLoop:
ColumnLoop:
stosb ;draw a pixel
add al,1 ;increment the attribute
ad cal,0 ;if the attribute just turned
adc al,0 ;if the attribute just turned
; over to 0, increment it to 1
; because we're not going to
; cycle DAC location 0, so

4
src/chapter-37.md
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@ -104,7 +104,7 @@ _LineDraw proc near
cld
push bp ;preserve caller's stack frame
mov bp,sp ;point to our stack frame
sub sp, LOCAL_SIZE ;allocate space for local variables
sub sp, LOCAL_SIZE ;allocate space for local variables
push si ;preserve C register variables
push di
push ds ;preserve caller's DS
@ -115,7 +115,7 @@ _LineDraw proc near
jle LineIsTopToBottom
xchg [bp].YEnd,ax; swap endpoints
mov [bp].YStart,ax
movbx, [bp].XStart
mov bx,[bp].XStart
xchg [bp].XEnd,bx
mov [bp].XStart,bx
LineIsTopToBottom:

4
src/chapter-39.md
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@ -718,7 +718,7 @@ DiagonalSkipEntry:
jmp ScanEdgeDone
align 2
YMajor:
pushbp ;preserve stack frame pointer
push bp ;preserve stack frame pointer
mov si,[bp+X1] ;starting X coordinate
cmp [bp+SkipFirst],1 ;skip the first point?
mov bp,bx ;put Height in BP for error term calcs
@ -734,7 +734,7 @@ YMajorSkipEntry:
YMajorNoAdvance:
dec bx ;count off this scan line
jnz YMajorLoop
popbp ;restore stack frame pointer
pop bp ;restore stack frame pointer
ScanEdgeDone:
cmp [bp+SetXStart],1 ;were we working with XStart field?
jz UpdateHLinePtr ;yes, DI points to the next XStart

12
src/chapter-43.md
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@ -443,7 +443,7 @@ Dataends
;
; Macro to output a word value to a port.
;
OUT_WORDmacro
OUT_WORD macro
if WORD_OUTS_OK
out dx,ax
else
@ -459,9 +459,9 @@ endif
; Macro to output a constant value to an indexed VGA
; register.
;
CONSTANT_TO_INDEXED_REGISTERmacro ADDRESS, INDEX, VALUE
movdx, ADDRESS
movax, (VALUE shl 8) + INDEX
CONSTANT_TO_INDEXED_REGISTER macro ADDRESS, INDEX, VALUE
mov dx, ADDRESS
mov ax, (VALUE shl 8) + INDEX
OUT_WORD
endm
;
@ -704,7 +704,7 @@ DrawObject proc near
mov dx,ax ;# of lines in the image
lodsw ;# of bytes across the image
mov bp,SCREEN_WIDTH
subbp,ax ;# of bytes to add to the display
sub bp,ax ;# of bytes to add to the display
; memory offset after copying a line
; of the image to display memory in
; order to point to the address
@ -718,7 +718,7 @@ DrawLoop:
; next line will go in display
; memory
dec dx ;count down the lines of the image
jnzDrawLoop
jnz DrawLoop
ret
DrawObjectendp
;

6
src/chapter-44.md
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@ -447,7 +447,7 @@ DrawRectParms ends
mov dh,RightMask[bx] ;set the right-edge clip mask
mov bx,LeftX[bp]
and bx,NOT 7 ;intrapixel address of left edge
su si,bx
sub si,bx
shr si,1
shr si,1
shr si,1 ;# of bytes across spanned by rectangle - 1
@ -455,7 +455,7 @@ DrawRectParms ends
and dl,dh ; combine the masks
MasksSet:
mov bx,BottomY[bp]
su bx,TopY[bp] ;# of scan lines to fill - 1
sub bx,TopY[bp] ;# of scan lines to fill - 1
FillLoop:
push di ;remember line start offset
mov al,dl ;left edge clip mask
@ -661,7 +661,7 @@ TextUpDone:
CharUp: ;draws the character in AL at ES:DI
lds si,[BIOS8x8Ptr] ;point to the 8x8 font start
mov bl,al
su bh,bh
sub bh,bh
shl bx,1
shl bx,1
shl bx,1 ;*8 to look up character offset in font

10
src/chapter-46.md
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@ -499,7 +499,7 @@ parms ends
les di,[bp+BufferPtr]
mov dx,[bp+RectHeight]
mov bx,[bp+BufferWidth]
su bx,[bp+RectWidth] ;distance from end of one dest scan
sub bx,[bp+RectWidth] ;distance from end of one dest scan
; to start of next
mov al,byte ptr [bp+Color]
mov ah,al ;double the color for REP STOSW
@ -544,7 +544,7 @@ parms2 ends
mov bx,[bp+Pixels]
mov dx,[bp+ImageHeight]
mov ax,[bp+BufferWidth2]
su ax,[bp+ImageWidth] ;distance from end of one dest scan
sub ax,[bp+ImageWidth] ;distance from end of one dest scan
mov [bp+BufferWidth2],ax ; to start of next
RowLoop2:
mov cx,[bp+ImageWidth]
@ -556,7 +556,7 @@ ColumnLoop:
mov es:[di],al
SkipPixel:
inc bx ;point to next source pixel
inc d ;point to next dest pixel
inc di ;point to next dest pixel
dec cx
jnz ColumnLoop
add di,[bp+BufferWidth2] ;point to next scan to fill
@ -596,9 +596,9 @@ parms3 ends
lds si,[bp+SrcBufferPtr]
mov dx,[bp+CopyHeight]
mov bx,[bp+DestBufferWidth] ;distance from end of one dest scan
su bx,[bp+CopyWidth] ; of copy to the next
sub bx,[bp+CopyWidth] ; of copy to the next
mov ax,[bp+SrcBufferWidth] ;distance from end of one source scan
su ax,[bp+CopyWidth] ; of copy to the next
sub ax,[bp+CopyWidth] ; of copy to the next
RowLoop3:
mov cx,[bp+CopyWidth] ;# of bytes to copy
shr cx,1

2
src/chapter-48.md
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@ -521,7 +521,7 @@ MasksSet:
mov [bp+SourceNextScanOffset],ax
mov [bp+RectAddrWidth],cx ;remember width in addresses - 1
;----------------------BUG FIX
mov dx,SC_INDEX
mov dx,SC_INDEX
mov al,MAP_MASK
out dx,al ;point SC Index reg to Map Mask
inc dx ;point to SC Data reg

38
src/chapter-53.md
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@ -174,7 +174,7 @@ else ; !ROUNDING-ON
sub eax,eax
shrd eax,edx,16 ;position so that result ends up
sar edx,16 ; in EAX
idivdword ptr [bp+Divisor]
idiv dword ptr [bp+Divisor]
endif ;ROUNDING-ON
shld edx,eax,16 ;whole part of result in DX;
; fractional part is already in AX
@ -224,9 +224,9 @@ jg MakeInRange
ja Quadrant1
;quadrant 0
shl bx,2
move ax,CosTable[bx] ;look up sine
mov eax,CosTable[bx] ;look up sine
neg bx ;sin(Angle) = cos(90-Angle)
move dx,CosTable[bx+90*10*4] ;look up cosine
mov edx,CosTable[bx+90*10*4] ;look up cosine
jmp short CSDone
align ALIGNMENT
@ -237,7 +237,7 @@ Quadrant1:
mov eax,CosTable[bx] ;look up cosine
neg eax ;negative in this quadrant
neg bx ;sin(Angle) = cos(90-Angle)
move dx,CosTable[bx+90*10*4] ;look up cosine
mov edx,CosTable[bx+90*10*4] ;look up cosine
jmp short CSDone
align ALIGNMENT
@ -248,11 +248,11 @@ BottomHalf: ;quadrant 2 or 3
ja Quadrant2
;quadrant 3
shl bx, 2
mov eax,CosTable[bx] ;look up cosine
neg bx ;sin(Angle) = cos(90-Angle)
movedx,CosTable[90*10*4+bx] ;look up sine
nege dx ;negative in this quadrant
jmp short CSDone
mov eax,CosTable[bx] ;look up cosine
neg bx ;sin(Angle) = cos(90-Angle)
mov edx,CosTable[90*10*4+bx] ;look up sine
neg edx ;negative in this quadrant
jmp short CSDone
align ALIGNMENT
Quadrant2:
@ -262,8 +262,8 @@ Quadrant2:
mov eax,CosTable[bx] ;look up cosine
neg eax ;negative in this quadrant
neg bx ;sin(Angle) = cos(90-Angle)
move dx,CosTable[90*10*4+bx] ;look up sine
nege dx ;negative in this quadrant
mov edx,CosTable[90*10*4+bx] ;look up sine
neg edx ;negative in this quadrant
CSDone:
mov bx,[bp].Cos
mov [bx],eax
@ -347,9 +347,9 @@ soff=soff+16
doff=doff+4
ENDM
popdi;restore register variables
popsi
popbp;restore stack frame
pop di;restore register variables
pop si
pop bp;restore stack frame
ret
-XformVecendp
;=====================================================================
@ -391,7 +391,7 @@ CXparms ends
push bp ;preserve stack frame
mov bp,sp ;set up local stack frame
push si ;preserve register variables
pushdi
push di
mov bx,[bp].SourceXform2 ;BX points to xform2 matrix
mov si,[bp].SourceXform1 ;SI points to xform1 matrix
@ -407,7 +407,7 @@ coff=0 ;column offset
imul dword ptr [bx+coff];times row 0 entry in column
if ROUNDING-ON
add eax,8000h ;round by adding 2^(-17)
adcedx,0;whole part of result is in DX
adc edx,0 ;whole part of result is in DX
endif ;ROUNDING-ON
shrd eax,edx,16 ;shift the result back to 16.16 form
mov ecx,eax ;set running total
@ -471,9 +471,9 @@ coff=coff+4 ;point to next col in xform2 & dest
roff=roff+16 ;point to next col in xform2 & dest
ENDM
popdi;restore register variables
popsi
popbp;restore stack frame
pop di;restore register variables
pop si
pop bp;restore stack frame
ret
-ConcatXformsendp
end

64
src/chapter-54.md
View file

@ -203,14 +203,14 @@ _FixedMul endp
; Fixedpoint FixedDiv(Fixedpoint Dividend, Fixedpoint Divisor);
FDparms struc
dw 2 dup(?) ;return address & pushed BP
Dividend dd?
Divisor dd?
Dividend dd ?
Divisor dd ?
FDparms ends
alignALIGNMENT
public_FixedDiv
align ALIGNMENT
public _FixedDiv
_FixedDivproc near
pushbp
movbp,sp
push bp
mov bp,sp
if USE386
@ -268,13 +268,13 @@ else ;!USE386
; projection can't be performed for points closer to the viewpoint than Z=1.
;figure out signs, so we can use
; unsigned divisions
subcx, cx ;assume both operands positive
sub cx,cx ;assume both operands positive
mov ax,word ptr [bp+Dividend+2]
and ax,ax;first operand negative?
jns CheckSecondOperandD ;no
neg ax ;yes, so negate first operand
neg word ptr [bp+Dividend]
sbbax,0
sbb ax,0
inc cx ;mark that first operand is negative
CheckSecondOperandD:
mov bx,word ptr [bp+Divisor+2]
@ -366,9 +366,9 @@ CheckInRange:
ja Quadrant1
;quadrant 0
shl bx,2
move ax,CosTable[bx] ;look up sine
mov eax,CosTable[bx] ;look up sine
neg bx;sin(Angle) = cos(90-Angle)
move dx,CosTable[bx+90*10*4] ;look up cosine
mov edx,CosTable[bx+90*10*4] ;look up cosine
jmp short CSDone
align ALIGNMENT
@ -376,10 +376,10 @@ Quadrant1:
neg bx
add bx,180*10 ;convert to angle between 0 and 90
shl bx,2
move ax,CosTable[bx] ;look up cosine
mov eax,CosTable[bx] ;look up cosine
neg eax ;negative in this quadrant
neg bx ;sin(Angle) = cos(90-Angle)
move dx,CosTable[bx+90*10*4] ;look up cosine
mov edx,CosTable[bx+90*10*4] ;look up cosine
jmp short CSDone
align ALIGNMENT
@ -390,9 +390,9 @@ BottomHalf: ;quadrant 2 or 3
ja Quadrant2
;quadrant 3
shl bx,2
move ax,CosTable[bx] ;look up cosine
mov eax,CosTable[bx] ;look up cosine
neg bx;sin(Angle) = cos(90-Angle)
move dx,CosTable[90*10*4+bx] ;look up sine
mov edx,CosTable[90*10*4+bx] ;look up sine
neg edx ;negative in this quadrant
jmp short CSDone
@ -401,10 +401,10 @@ Quadrant2:
neg bx
add bx,180*10 ;convert to angle between 0 and 90
shl bx,2
move ax,CosTable[bx] ;look up cosine
mov eax,CosTable[bx] ;look up cosine
neg eax ;negative in this quadrant
neg bx ;sin(Angle) = cos(90-Angle)
move dx,CosTable[90*10*4+bx] ;look up sine
mov edx,CosTable[90*10*4+bx] ;look up sine
neg edx ;negative in this quadrant
CSDone:
mov bx,[bp].Cos
@ -619,9 +619,9 @@ if MUL-ROUNDING-ON
adc edx,0 ;whole part of result is in DX
endif ;MUL-ROUNDING-ON
shrd eax,edx,16 ;shift the result back to 16.16 form
move cx,eax ;set running total
mov ecx,eax ;set running total
move ax,[si+soff+4] ;column 1 entry on this row
mov eax,[si+soff+4] ;column 1 entry on this row
imul dword ptr [bx+4] ;xform entry times source Y entry
if MUL-ROUNDING-ON
add eax,8000h ;round by adding 2^(-17)
@ -630,7 +630,7 @@ endif ;MUL-ROUNDING-ON
shrd eax,edx,16 ;shift the result back to 16.16 form
add ecx,eax ;running total for this row
move ax,[si+soff+8] ;column 2 entry on this row
mov eax,[si+soff+8] ;column 2 entry on this row
imul dword ptr [bx+8] ;xform entry times source Z entry
if MUL-ROUNDING-ON
add eax,8000h ;round by adding 2^(-17)
@ -759,17 +759,17 @@ coff=0 ;column offset
REPT 3 ;once for each of the first 3 columns,
; assuming 0 as the bottom entry (no
; translation)
move ax,[si+roff] ;column 0 entry on this row
mov eax,[si+roff] ;column 0 entry on this row
imul dword ptr [bx+coff] ;times row 0 entry in column
if MUL-ROUNDING-ON
add eax,8000h ;round by adding 2^(-17)
adc edx,0 ;whole part of result is in DX
endif ;MUL-ROUNDING-ON
shrd eax,edx,16 ;shift the result back to 16.16 form
move cx,eax ;set running total
mov ecx,eax ;set running total
move ax,[si+roff+4] ;column 1 entry on this row
imuld word ptr [bx+coff+16] ;times row 1 entry in col
mov eax,[si+roff+4] ;column 1 entry on this row
imul dword ptr [bx+coff+16] ;times row 1 entry in col
if MUL-ROUNDING-ON
add eax,8000h ;round by adding 2^(-17)
adc edx,0 ;whole part of result is in DX
@ -777,8 +777,8 @@ endif ;MUL-ROUNDING-ON
shrd eax,edx,16 ;shift the result back to 16.16 form
add ecx,eax ;running total
move ax,[si+roff+8] ;column 2 entry on this row
imuld word ptr [bx+coff+32] ;times row 2 entry in col
mov eax,[si+roff+8] ;column 2 entry on this row
imul dword ptr [bx+coff+32] ;times row 2 entry in col
if MUL-ROUNDING-ON
add eax,8000h ;round by adding 2^(-17)
adc edx,0 ;whole part of result is in DX
@ -792,17 +792,17 @@ coff=coff+4 ;point to next col in xform2 & dest
;now do the fourth column, assuming
; 1 as the bottom entry, causing
; translation to be performed
move ax,[si+roff] ;column 0 entry on this row
imuld word ptr [bx+coff] ;times row 0 entry in column
mov eax,[si+roff] ;column 0 entry on this row
imul dword ptr [bx+coff] ;times row 0 entry in column
if MUL-ROUNDING-ON
add eax,8000h ;round by adding 2^(-17)
adc edx,0 ;whole part of result is in DX
endif ;MUL-ROUNDING-ON
shrd eax,edx,16 ;shift the result back to 16.16 form
move cx,eax ;set running total
mov ecx,eax ;set running total
move ax,[si+roff+4] ;column 1 entry on this row
imuld word ptr [bx+coff+16] ;times row 1 entry in col
mov eax,[si+roff+4] ;column 1 entry on this row
imul dword ptr [bx+coff+16] ;times row 1 entry in col
if MUL-ROUNDING-ON
add eax,8000h ;round by adding 2^(-17)
adc edx,0 ;whole part of result is in DX
@ -810,8 +810,8 @@ endif ;MUL-ROUNDING-ON
shrd eax,edx,16 ;shift the result back to 16.16 form
add ecx,eax ;running total
move ax,[si+roff+8] ;column 2 entry on this row
imuld word ptr [bx+coff+32] ;times row 2 entry in col
mov eax,[si+roff+8] ;column 2 entry on this row
imul dword ptr [bx+coff+32] ;times row 2 entry in col
if MUL-ROUNDING-ON
add eax,8000h ;round by adding 2^(-17)
adc edx,0 ;whole part of result is in DX