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comparison m68k.cpu @ 2580:939b818df589

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Get 68K interrupts working in new CPU core
author Michael Pavone <pavone@retrodev.com>
date Sat, 08 Feb 2025 11:40:42 -0800
parents 9b01541cbd60
children 0f7609fe03f2
comparison
equal deleted inserted replaced
2579:bd8d1babbfb5 2580:939b818df589
171 #INT_PENDING_SR_CHANGE 171 #INT_PENDING_SR_CHANGE
172 if 254 = int_pending 172 if 254 = int_pending
173 int_pending = int_priority 173 int_pending = int_priority
174 int_pending_num = int_num 174 int_pending_num = int_num
175 175
176 end
177
178 check_user_mode_swap_ssp_usp
179
180 cycles 6
181 #save status reg
182 a7 -= 6
183 m68k_get_sr
184 scratch2 = a7
185 ocall write_16
186
187 #update status register
188 status &= 0x78
189 status |= int_pending
190 status |= 0x20
191
192 #Interrupt ack cycle
193 int_ack = int_pending
194 cycles 4
195 if int_ack_handler
196 pcall int_ack_handler int_ack_fun context
197 end
198 if int_pending_num
176 else 199 else
200 int_pending_num = int_pending + 24
201 end
177 202
178 check_user_mode_swap_ssp_usp 203 #save pc
179 204 scratch2 = a7 + 2
180 cycles 6 205 scratch1 = pc - 2
181 #save status reg 206 m68k_write32_lowfirst scratch1
182 sub 6 a7 a7 207
183 m68k_get_sr 208 scratch1 = int_pending_num << 2
184 mov a7 scratch2 209 int_pending = 255 #INT_PENDING_NONE
185 ocall write_16 210 int_pending_num = 0
186 211 m68k_read32
187 #update status register 212 mov scratch1 pc
188 and 0x78 status status 213 m68k_prefetch
189 or int_priority status status 214 update_sync
190 or 0x20 status status
191
192 #Interrupt ack cycle
193 mov int_pending int_ack
194 cycles 4
195 if int_ack_handler
196 pcall int_ack_handler int_ack_fun context
197 end
198 if int_pending_num
199 else
200 int_pending_num = int_pending + 24
201 end
202
203 #save pc
204 add 2 a7 scratch2
205 m68k_write32_lowfirst pc
206
207 lsl int_pending_num 2 scratch1
208 m68k_read32
209 mov scratch1 pc
210 update_sync
211 end
212 end 215 end
213 end 216 end
214 217
215 m68k_run_op 218 m68k_run_op
216 dispatch prefetch 219 dispatch prefetch