diff options
Diffstat (limited to 'zruntime.S')
| -rw-r--r-- | zruntime.S | 21 |
1 files changed, 11 insertions, 10 deletions
@@ -133,7 +133,8 @@ z80_write_byte_noinc: jb z80_write_ym2612 cmp $0x6100, %r14w jb z80_write_bank_reg - /* TODO: YM-2612, PSG/VDP */ + cmp $0x7F00, %r14w + jae z80_write_vdp ret z80_write_ram: and $0x1FFF, %r14 @@ -150,13 +151,6 @@ z80_write_ram: not_code: ret z80_write_bank: - and $0x7FFF, %r14 - cmp $0, %r12 - je slow_bank_write - /* 68K memory is byte swapped */ - xor $1, %r14 - mov %r13b, (%r12, %r14) - ret slow_bank_write: /* TODO: Call into C to implement this */ ret @@ -167,8 +161,7 @@ z80_write_ym2612: mov %r13b, %dl call z80_write_ym mov %rax, %rsi - call z80_load_context - ret + jmp z80_load_context z80_write_bank_reg: and $1, %r13w shr %r15w @@ -184,6 +177,14 @@ update_bank_ptr: shl $15, %r12 add 80(%rsi), %r12 ret +z80_write_vdp: + and $0xFF, %r14w + call z80_save_context + mov %r14w, %di + mov %r13b, %dl + call z80_vdp_port_write + mov %rax, %rsi + jmp z80_load_context .global z80_read_word z80_read_word: |