diff options
Diffstat (limited to 'runtime.S')
| -rw-r--r-- | runtime.S | 40 |
1 files changed, 40 insertions, 0 deletions
@@ -25,6 +25,24 @@ do_vdp_port_read: mov 120(%rsi), %cx ret +do_io_write: + call m68k_save_context + and $0xFF, %edi + mov %rcx, %rdx + call io_write + mov %rax, %rsi + call m68k_load_context + ret +do_io_read: + mov %ecx, %edi + and $0xFF, %edi + call m68k_save_context + call io_read + mov %rax, %rsi + call m68k_load_context + mov 120(%rsi), %cl + ret + bad_access_msg: .asciz "Program tried to access illegal 68K address %X\n" @@ -100,6 +118,14 @@ m68k_write_byte: jle cart_wb cmp $0xE00000, %edi jge workram_wb + cmp $0xC00000, %edi + jge vdp_psg_wb + cmp $0xA10000, %edi + jl not_io_wb + cmp $0xA10100, %edi + jge not_io_wb + jmp do_io_write +not_io_wb: ret workram_wb: and $0xFFFF, %rdi @@ -108,6 +134,14 @@ workram_wb: cart_wb: mov %cl, (%r8, %rdi) ret +vdp_psg_wb: + push %rdx + mov %cl, %dl + and $0xFF, %cx + shl $8, %dx + or %dx, %cx + pop %rdx + jmp vdp_psg_w .global m68k_write_long_lowfirst m68k_write_long_lowfirst: @@ -192,6 +226,12 @@ m68k_read_byte_scratch1: jle cart_b cmp $0xE00000, %ecx jge workram_b + cmp $0xA10000, %ecx + jl not_io_b + cmp $0xA10100, %ecx + jge not_io_b + jmp do_io_read +not_io_b: xor %cl, %cl dec %cl ret |