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comparison zruntime.S @ 507:cc6030bd04c6

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Add 3 wait states to Z80 access to bank area since that seems to be roughly the average in normal usage
author Michael Pavone <pavone@retrodev.com>
date Tue, 28 Jan 2014 08:36:06 -0800
parents b7c3b2d22858
children b976c6d6e5fb
comparison
equal deleted inserted replaced
506:a3b48a57e847 507:cc6030bd04c6
105 z80_read_ram: 105 z80_read_ram:
106 and $0x1FFF, %r13 106 and $0x1FFF, %r13
107 mov (%r11, %r13), %r13b 107 mov (%r11, %r13), %r13b
108 ret 108 ret
109 z80_read_bank: 109 z80_read_bank:
110 /* approximation of wait states for 68K bus access */
111 add $3, %ebp
110 and $0x7FFF, %r13 112 and $0x7FFF, %r13
111 cmp $0, %r12 113 cmp $0, %r12
112 je slow_bank_read 114 je slow_bank_read
113 /* 68K memory is byte swapped */ 115 /* 68K memory is byte swapped */
114 xor $1, %r13 116 xor $1, %r13
156 call z80_load_context 158 call z80_load_context
157 not_code: 159 not_code:
158 ret 160 ret
159 z80_write_bank: 161 z80_write_bank:
160 slow_bank_write: 162 slow_bank_write:
163 /* approximation of wait states for 68K bus access */
164 add $3, %ebp
161 /* TODO: Call into C to implement this */ 165 /* TODO: Call into C to implement this */
162 ret 166 ret
163 z80_write_ym2612: 167 z80_write_ym2612:
164 and $0x3, %r14w 168 and $0x3, %r14w
165 call z80_save_context 169 call z80_save_context