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/*
* Copyright (C) 1996-1998 Szeredi Miklos
* Email: mszeredi@inf.bme.hu
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version. See the file COPYING.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/* -*- asm -*- */
#ifndef COMPARISON
#define SPT(s) NAME(sp_ ## s)
#else
#define SPT(s) NAME(spx_ ## s)
#endif
#define LOAD_DI 0x0559
#define OS 80
#define EARBIT 0x40
#define NEXT_SCRI DAT(OS,0)
#define INPORT_MASK DAT(OS,4)
#define ULA_INPORT DAT(OS,8)
#define ULA_OUTPORT DAT(OS,12)
#define SOUND_SAM DAT(OS,16)
#define SOUND_CHANGE DAT(OS,20)
#define IMP_CHANGE DAT(OS,24)
#define JROM(addr, label) \
testw $0xC000, addr ; \
jz label
#define JNROM(addr, label) \
testw $0xC000, addr ; \
jnz label
#define JSCR(addr, label) \
cmpw $0x5B00, addr ; \
jb label
#define JNSCR(addr, label) \
cmpw $0x5B00, addr ; \
jnb label
#define JROMB(addr, label) \
testb $0xC0, addr ; \
jz label
#define JNROMB(addr, label) \
testb $0xC0, addr ; \
jnz label
#define JSCRB(addr, label) \
cmpb $0x5B, addr ; \
jb label
#define JNSCRB(addr, label) \
cmpb $0x5B, addr ; \
jnb label
#define MARK_SCR(addr) \
xchgw RAF, addr ; \
btsl SCRP, SPT(scr_mark) ; \
xchgw RAF, addr
#define MARK_SCR_VWP(addr) \
movzwl addr, VWP ; \
btsl VWP, SPT(scr_mark)
#define MEM_DELAY(l) \
cmpl $0, NEXT_SCRI ; \
jl l ; \
cmpl $86, TC ; \
jle l ; \
subl $2, TC
#define PUTMEM_REG(l, reg, regh, regp, val, endf) \
JSCRB(regh, l ## _scr) ; \
movb val, (regp) ; \
endf ; \
l ## _scr: ; \
JROMB(regh, l ## _rom) ; \
movb val, (regp) ; \
MARK_SCR_VWP(reg) ; \
MEM_DELAY(l ## _rom) ; \
endf ; \
l ## _rom: ; \
endf
#define PUTMEM_REG_NE(l, reg, regh, regp, val) \
JROMB(regh, l ## _mid) ; \
movb val, (regp) ; \
JNSCRB(regh, l ## _mid) ; \
MARK_SCR(reg) ; \
MEM_DELAY(l ## _mid) ; \
l ## _mid:
#define PUTMEM_DREG_NE(l, reg, regp, val) \
JROM(reg, l ## _mid) ; \
movb val, (regp) ; \
JNSCR(reg, l ## _mid) ; \
MARK_SCR(reg) ; \
MEM_DELAY(l ## _mid) ; \
l ## _mid:
#define MODMEMF(l, func, endf) \
JSCRB(RH, l ## _scr) ; \
func((HLP)) ; \
endf ; \
l ## _scr: ; \
JROMB(RH, l ## _rom) ; \
func((HLP)) ; \
MARK_SCR_VWP(RHL) ; \
MEM_DELAY(l ## _rend) ; \
endf ; \
l ## _rom: ; \
movb (HLP), RW ; \
func(RW) ; \
l ## _rend: ; \
endf
#define PUSH_CMPX(l, rh, rl) \
decw RSP ; \
PUTMEM_DREG_NE(l ## 1, RSP, SPP, rh); \
decw RSP ; \
PUTMEM_DREG_NE(l ## 2, RSP, SPP, rl)
#define PUSHT(l, rh, rl, t) \
cmpw $0x5B01, RSP ; \
jb l ## _cmpx ; \
decw RSP ; \
movb rh, (SPP) ; \
decw RSP ; \
movb rl, (SPP) ; \
TIME(t) ; \
l ## _cmpx: ; \
PUSH_CMPX(l, rh, rl) ; \
TIME(t) ; \
#define PUSH(l, rh, rl) \
cmpw $0x5B01, RSP ; \
jb l ## _cmpx ; \
decw RSP ; \
movb rh, (SPP) ; \
decw RSP ; \
movb rl, (SPP) ; \
jmp l ## _end ; \
ALIGN ; \
l ## _cmpx: ; \
PUSH_CMPX(l, rh, rl) ; \
l ## _end:
#define TICKPERLINE 224
#define SOUNDPORT 0x10
#define IN(l, porth, portl, rd) \
movl INPORT_MASK, VWP ; \
testb RW, portl ; \
jz l ## _in_active ; \
testb $1, portl ; \
jnz l ## _in_ulabus ; \
cmpl TC,IMP_CHANGE ; \
jg l ## _in_imp ; \
movzbl porth, VWP ; \
movb SPT(fe_inport_high)(VWP), rd; \
andb ULA_INPORT, rd ; \
decl TC ; \
jmp l ## _in_end ; \
ALIGN ; \
l ## _in_imp: ; \
movl $0,IMP_CHANGE ; \
xorb $EARBIT,ULA_INPORT ; \
movzbl porth, VWP ; \
movb SPT(fe_inport_high)(VWP), rd; \
andb ULA_INPORT, rd ; \
decl TC ; \
jmp l ## _in_end ; \
ALIGN ; \
l ## _in_active: ; \
movzbl portl, VWP ; \
movb Z80(inports)(VWP), rd; \
jmp l ## _in_end ; \
ALIGN ; \
l ## _in_ulabus: ; \
movl PCP, VWP ; \
movw NEXT_SCRI, RVW ; \
cmpw $0, RVW ; \
jl l ## _in_ulaidle ; \
cmpl $96, TC ; \
jle l ## _in_ulaidle ; \
pushl TC ; \
shrw $2, %di ; \
shlw $5, RVW ; \
addw $56, RVW ; \
subw %di, RVW ; \
popl TC ; \
movb (VWP), rd ; \
jmp l ## _in_end ; \
l ## _in_ulaidle: ; \
movb $0xFF, rd ; \
jmp l ## _in_end ; \
ALIGN ; \
l ## _in_end:
#define OUT(l, porth, portl, rs) \
testb $1, portl ; \
jnz l ## _out_nonfe ; \
movb rs, RV ; \
xorb ULA_OUTPORT, RV ; \
decl TC ; \
movb rs, ULA_OUTPORT ; \
testb $SOUNDPORT, RV ; \
jz l ## _out_end ; \
movl $1, SOUND_CHANGE ; \
testb $SOUNDPORT, rs ; \
jz l ## _out_s_0 ; \
addl TC, SOUND_SAM ; \
jmp l ## _out_end ; \
ALIGN ; \
l ## _out_s_0: ; \
subl TC, SOUND_SAM ; \
jmp l ## _out_end ; \
ALIGN ; \
l ## _out_nonfe: ; \
movzbl portl, VWP ; \
movb rs, Z80(outports)(VWP); \
l ## _out_end:
#define DI_CHECK \
cmpw $LOAD_DI+1, RPC ; \
je load_point ; \
di_check_end:
load_point:
cmpl $0, SPT(quick_load)
je di_check_end
movl $1, SPT(load_trapped)
movl $1, HALTSTATE
movl $0, TC
jmp loop_end
#define SCLINE %ebx
#define INC_SCLINE \
incl SCLINE ; \
andl $0x03FF, SCLINE ; \
movl SCLINE, SPT(scline)
#define SCRPTR %edi
#define SPM %ecx
#define SPM0 %cl
#define SPM1 %ch
#define SPC %ebx
#define SPC0 %bl
#define SPC1 %bh
#define SPMP %esi
#define SPCP %ebp
#define SPI %edx
#define SPIW %dx
#define SPI0 %dl
#define SPI1 %dh
#define SCRI %ebx
#define COLI %edx
#define COLI0 %dl
#define TRANS_SCR \
movl (SPI),%eax ; \
stosl
#define SCR_8_PIXELS(spcx, spmx, aa) \
movb spcx,SPI1 ; \
aa ; \
movb spmx,SPI0 ; \
shrb $2,SPI0 ; \
andb $0x3C,SPI0 ; \
TRANS_SCR ; \
movb spmx,SPI0 ; \
shlb $2,SPI0 ; \
andb $0x3C,SPI0 ; \
TRANS_SCR
#define SHRLSPC shrl $16, SPC
#define SCR_32_PIXELS \
movl (SPMP),SPM ; \
movl (SPCP),SPC ; \
SCR_8_PIXELS(SPC0, SPM0, ); \
addl $4, SPMP ; \
SCR_8_PIXELS(SPC1, SPM1, SHRLSPC); \
shrl $16, SPM ; \
SCR_8_PIXELS(SPC0, SPM0, ); \
addl $4, SPCP ; \
SCR_8_PIXELS(SPC1, SPM1, ); \
#define GET_BORDER \
movb SPT(colors)(,%ecx,1), %cl; \
movb %cl, %ch ; \
movw %cx, %ax ; \
shll $16, %eax ; \
movw %cx, %ax
ALIGN
.globl SPT(halfframe)
/* .type SPT(halfframe),@function */
SPT(halfframe):
movl 8(%esp), %eax
movl %eax, linesleft
movl 4(%esp), %eax
pushl %ebp
pushl %edi
pushl %esi
pushl %ebx
pushl %es
cld
movl %eax, TC
movl SPT(image), %eax
movl %eax, scrptr
#ifndef USE_DJGPP
movw %ds, %ax
#else
movw NAME(djsp_video_segment), %ax
#endif
movw %ax, %es
call load_regs
new_loop:
movl SPT(scline), %eax
movl SPT(scri)(,%eax,4), %eax
movl %eax, NEXT_SCRI
call step_loop
pushl SCLINE
movl SPT(scline), SCLINE
/* store sound */
movb SOUND_SAM, %al
movb %al, SPT(sound_buf)(SCLINE)
movb ULA_OUTPORT, %al
testb $SOUNDPORT, %al
jz sound_0
movb $240, SOUND_SAM
jmp sound_end
ALIGN
sound_0:
movb $16, SOUND_SAM
sound_end:
/* change EAR bit, store MIC bit*/
movb %al, SPT(fe_outport_time)(SCLINE)
cmpl $0,IMP_CHANGE
je no_imp_change
xorb $EARBIT, ULA_INPORT
no_imp_change:
movzbl SPT(tape_impinfo)(SCLINE), %eax
movl %eax, IMP_CHANGE
/* Check if updating screen */
cmpl $0, SPT(updating)
jz not_to_update
movl NEXT_SCRI, %eax
cmpl $-1, %eax
jl not_to_update
je only_border
scr_update:
pushl %ecx
pushl %edx
pushl %edi
movl SPT(coli)(,SCLINE, 4), COLI
INC_SCLINE
movl %eax, SCRI
movl scrptr, SCRPTR
movl SCRPTR, %eax
addl $320, %eax
movl %eax, scrptr
movzbl ULA_OUTPORT, %ecx
andb $0x07, %cl
cmpb %cl, SPT(lastborder)
jne sbrd_change
cmpl $0, SPT(border_update)
jne sbrd_update
addl $0x20, SCRPTR
sbrd_no_update:
movl COLI, %eax
shrl $3, %eax
testb $0x07, COLI0
jz clear_cm
movl SPT(scr_mark)+(0x2C0*4)(,%eax,4), %ecx
no_clear_cm:
xorl %eax, %eax
xchgl SPT(scr_mark)(,SCRI,4), %eax
orl %eax, %ecx
jz skip_update
orl %ecx, SPT(imag_mark)(,COLI,4)
orl %ecx, SPT(imag_horiz)
shrl $3, COLI
btsl COLI, SPT(imag_vert)
/* update screen line */
pushl %esi
pushl %ebp
/* %esi is PCP and SPMP ! */
xorw %si, %si
movl %esi, %eax
shll $5, SCRI
shll $5, COLI
addl SCRI, SPMP
leal 0x5800(%eax, COLI), SPCP
/* Draw pixels */
movl $0xF, %ebx
pushl %ecx
subl $4, %esp
cmpl $0, SPT(flash_state)
jnz scr_f1
movl SPT(scr_f0_table), SPI
jmp scr_32_pixels
ALIGN
scr_f1:
movl SPT(scr_f1_table), SPI
jmp scr_32_pixels
ALIGN
scr_32_pixels:
testl %ebx, %ecx
jz skip_32_pixels
movl %ebx, (%esp)
SCR_32_PIXELS
movl (%esp), %ebx
shll $4, %ebx
jz end_screen_line
movl 4(%esp), %ecx
jmp scr_32_pixels
ALIGN
skip_32_pixels:
addl $4, SPMP
addl $4, SPCP
addl $32, SCRPTR
shll $4, %ebx
jz end_screen_line
jmp scr_32_pixels
ALIGN
end_screen_line:
addl $8, %esp
popl %ebp
popl %esi
skip_update:
popl %edi
popl %edx
popl %ecx
jmp update_end
ALIGN
sbrd_change:
movl $2, SPT(border_update)
xchgb %cl, SPT(lastborder)
sbrd_update:
GET_BORDER
/* Draw border */
xorl %ecx, %ecx
movb $8, %cl
rep
stosl
addl $0x100, SCRPTR
movb $8, %cl
rep
stosl
subl $0x120, SCRPTR
jmp sbrd_no_update
ALIGN
clear_cm:
xorl %ecx, %ecx
xchgl SPT(scr_mark)+(0x2C0*4)(,%eax,4), %ecx
testl %ecx, %ecx
jz no_clear_cm
leal SPT(scr_mark)(,SCRI,4), %eax
orl %ecx, (%eax)
orl %ecx, 0x20(%eax)
orl %ecx, 0x40(%eax)
orl %ecx, 0x60(%eax)
addl $0x80, %eax
orl %ecx, (%eax)
orl %ecx, 0x20(%eax)
orl %ecx, 0x40(%eax)
orl %ecx, 0x60(%eax)
jmp no_clear_cm
ALIGN
only_border:
INC_SCLINE
pushl %edi
movl %ecx, %ebx
movzbl ULA_OUTPORT, %ecx
andb $0x07, %cl
cmpb %cl, SPT(lastborder)
je brd_no_change
movl $2, SPT(border_update)
xchgb %cl, SPT(lastborder)
brd_no_change:
cmpl $0, SPT(border_update)
je brd_no_update
GET_BORDER
movl scrptr, SCRPTR
movl $80, %ecx
rep
stosl
brd_no_update:
addl $320, scrptr
movl %ebx, %ecx
popl %edi
jmp update_end
ALIGN
not_to_update:
INC_SCLINE
update_end:
popl SCLINE
decl linesleft
jz chunk_end
addl $TICKPERLINE, TC
jmp new_loop
ALIGN
chunk_end:
call store_regs
movl TC, %eax
popl %es
popl %ebx
popl %esi
popl %edi
popl %ebp
ret
ALIGN
.data
linesleft:
.long 0
scrptr:
.long 0
.text
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