Mercurial > repos > blastem

comparison zruntime.S @ 280:9ee64039ddeb

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Fix bank register update
author Mike Pavone <pavone@retrodev.com>
date Fri, 03 May 2013 21:09:48 -0700
parents 6be6056735a9
children 44f0bbf57b4f
comparison
equal deleted inserted replaced
279:6be6056735a9 280:9ee64039ddeb
66 cmp $0x4000, %r13w 66 cmp $0x4000, %r13w
67 jb z80_read_ram 67 jb z80_read_ram
68 cmp $0x8000, %r13w 68 cmp $0x8000, %r13w
69 jae z80_read_bank 69 jae z80_read_bank
70 /* TODO: Bank reg, YM-2612, PSG/VDP */ 70 /* TODO: Bank reg, YM-2612, PSG/VDP */
71 mov $FF, $r13b 71 mov $0xFF, %r13b
72 ret 72 ret
73 z80_read_ram: 73 z80_read_ram:
74 and $0x1FFF, %r13 74 and $0x1FFF, %r13
75 mov (%r11, %r13), %r13b 75 mov (%r11, %r13), %r13b
76 ret 76 ret
123 slow_bank_write: 123 slow_bank_write:
124 /* TODO: Call into C to implement this */ 124 /* TODO: Call into C to implement this */
125 ret 125 ret
126 z80_write_bank_reg: 126 z80_write_bank_reg:
127 and $1, %r13w 127 and $1, %r13w
128 shl %r15w 128 shr %r15w
129 shl $8, %r13w
130 xor %r12, %r12
129 or %r13w, %r15w 131 or %r13w, %r15w
130 and $0x1FF, %r15w 132 and $0x1FF, %r15w
131 xor %r12, %r12
132 cmp $0x80, %r15w 133 cmp $0x80, %r15w
133 jb update_bank_ptr 134 jb update_bank_ptr
134 ret 135 ret
135 update_bank_ptr: 136 update_bank_ptr:
136 mov %r15w, %r12w 137 mov %r15w, %r12w