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refactor PAGE2 switch to C

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This commit is contained in:
Aaron Culliney 2014-05-10 11:56:54 -07:00
parent 9ff453be23
commit 8b00636f66
2 changed files with 52 additions and 57 deletions
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57
src/asm386/memory.S
View File

@ -149,63 +149,6 @@
enabled. enabled.
----------------------------------------------------------------- */ ----------------------------------------------------------------- */
/* PAGE2 off. if 80STORE on then we use main text page1, and if HIRES
on we also use main hires page1, regardless of RAMRD and
RAMWRT. */
E(iie_page2_off)
testl $SS_PAGE2, SN(softswitches) # already off?
jz ram_nop
andl $~(SS_PAGE2|SS_SCREEN), SN(softswitches)
testl $SS_80STORE, SN(softswitches)
jz _iie_page2_off_hires_off # no 80STORE
andl $~(SS_TEXTRD|SS_TEXTWRT), SN(softswitches)
movl $SN(apple_ii_64k), SN(base_textrd)
movl $SN(apple_ii_64k), SN(base_textwrt)
testl $SS_HIRES, SN(softswitches)
jz _iie_page2_off_hires_off # no HIRES
andl $~(SS_HGRRD|SS_HGRWRT), SN(softswitches)
movl $SN(apple_ii_64k), SN(base_hgrrd)
movl $SN(apple_ii_64k), SN(base_hgrwrt)
_iie_page2_off_hires_off:
pushal
pushl $0 # page 1 main
call SN(video_setpage)
addl $4, %esp
popal
/* call SN(video_redraw)# redraw */
ret
/* PAGE2 on. if 80STORE on then we use aux text page 1, and if HIRES
on we also use aux hires page 1, regardless of RAMRD and
RAMWRT. */
E(iie_page2_on)
testl $SS_PAGE2, SN(softswitches) # already on?
jnz ram_nop
orl $SS_PAGE2, SN(softswitches)
testl $SS_80STORE, SN(softswitches)
jz _iie_page2_on_80store_off # no 80STORE
orl $(SS_TEXTRD|SS_TEXTWRT), SN(softswitches)
movl $SN(apple_ii_64k)+BANK2, SN(base_textrd)
movl $SN(apple_ii_64k)+BANK2, SN(base_textwrt)
testl $(SS_HIRES), SN(softswitches)
jz _iie_page2_on_cont
orl $(SS_HGRRD|SS_HGRWRT), SN(softswitches)
movl $SN(apple_ii_64k)+BANK2, SN(base_hgrrd)
movl $SN(apple_ii_64k)+BANK2, SN(base_hgrwrt)
_iie_page2_on_cont:
ret
_iie_page2_on_80store_off: # no 80STORE
orl $SS_SCREEN, SN(softswitches)
pushal
pushl $1 # page 2 main
call SN(video_setpage)
addl $4, %esp
popal
/* call SN(video_redraw)# redraw */
ret
E(read_switch_graphics) E(read_switch_graphics)
testl $SS_TEXT, SN(softswitches) testl $SS_TEXT, SN(softswitches)
jz ram_nop jz ram_nop

52
src/vm.c
View File

@ -61,3 +61,55 @@ GLUE_C_READ(speaker_toggle)
return 0; return 0;
} }
// ----------------------------------------------------------------------------
// Softswitches
GLUE_C_READ(iie_page2_off)
{
if (!(softswitches & SS_PAGE2)) {
return 0x0; // TODO: no early return?
}
softswitches &= ~(SS_PAGE2|SS_SCREEN);
if (softswitches & SS_80STORE) {
softswitches &= ~(SS_TEXTRD|SS_TEXTWRT);
base_textrd = apple_ii_64k[0];
base_textwrt = apple_ii_64k[0];
if (softswitches & SS_HIRES) {
softswitches &= ~(SS_HGRRD|SS_HGRWRT);
base_hgrrd = apple_ii_64k[0];
base_hgrwrt = apple_ii_64k[0];
}
}
video_setpage(0);
return 0x0;
}
GLUE_C_READ(iie_page2_on)
{
if (softswitches & SS_PAGE2) {
return 0x0; // TODO: no early return?
}
softswitches |= SS_PAGE2;
if (softswitches & SS_80STORE) {
softswitches |= (SS_TEXTRD|SS_TEXTWRT);
base_textrd = apple_ii_64k[1];
base_textwrt = apple_ii_64k[1];
if (softswitches & SS_HIRES) {
softswitches |= (SS_HGRRD|SS_HGRWRT);
base_hgrrd = apple_ii_64k[1];
base_hgrwrt = apple_ii_64k[1];
}
} else {
softswitches |= SS_SCREEN;
video_setpage(1);
}
return 0x0;
}