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comparison cdd_mcu.c @ 2280:9ead0fe69d9b

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Implement savestate support for Sega CD
author Michael Pavone <pavone@retrodev.com>
date Sun, 08 Jan 2023 14:42:24 -0800
parents 827ab6dd534a
children 047253715fd8
comparison
equal deleted inserted replaced
2279:3b5fef896475 2280:9ead0fe69d9b
807 context->next_byte_cycle -= cd_deduction; 807 context->next_byte_cycle -= cd_deduction;
808 if (context->next_subcode_cycle != CYCLE_NEVER) { 808 if (context->next_subcode_cycle != CYCLE_NEVER) {
809 context->next_subcode_cycle -= cd_deduction; 809 context->next_subcode_cycle -= cd_deduction;
810 } 810 }
811 } 811 }
812
813 void cdd_mcu_serialize(cdd_mcu *context, serialize_buffer *buf)
814 {
815 save_int32(buf, context->cycle);
816 save_int32(buf, context->next_int_cycle);
817 save_int32(buf, context->next_subcode_int_cycle);
818 save_int32(buf, context->last_sector_cycle);
819 save_int32(buf, context->last_nibble_cycle);
820 save_int32(buf, context->next_byte_cycle);
821 save_int32(buf, context->next_subcode_cycle);
822 save_int8(buf, context->current_status_nibble);
823 save_int8(buf, context->current_cmd_nibble);
824 save_int16(buf, context->current_sector_byte);
825 save_int8(buf, context->current_subcode_byte);
826 save_int8(buf, context->current_subcode_dest);
827 save_int32(buf, context->head_pba);
828 save_int32(buf, context->seek_pba);
829 save_int32(buf, context->pause_pba);
830 save_int32(buf, context->coarse_seek);
831 save_buffer8(buf, (uint8_t *)&context->cmd_buffer, sizeof(context->cmd_buffer));
832 save_buffer8(buf, (uint8_t *)&context->status_buffer, sizeof(context->status_buffer));
833 save_int8(buf, context->requested_format);
834 save_int8(buf, context->status);
835 save_int8(buf, context->error_status);
836 save_int8(buf, context->requested_track);
837 save_int8(buf, context->cmd_recv_wait);
838 save_int8(buf, context->cmd_recv_pending);
839 save_int8(buf, context->int_pending);
840 save_int8(buf, context->subcode_int_pending);
841 save_int8(buf, context->toc_valid);
842 save_int8(buf, context->first_cmd_received);
843 save_int8(buf, context->seeking);
844 save_int8(buf, context->in_fake_pregap);
845 }
846
847 static int sign_extend8(uint8_t value)
848 {
849 if (value & 0x80) {
850 return value | 0xFFFFFF00;
851 } else {
852 return value;
853 }
854 }
855
856 static int sign_extend16(uint16_t value)
857 {
858 if (value & 0x8000) {
859 return value | 0xFFFF0000;
860 } else {
861 return value;
862 }
863 }
864
865 void cdd_mcu_deserialize(deserialize_buffer *buf, void *vcontext)
866 {
867 cdd_mcu *context = vcontext;
868 context->cycle = load_int32(buf);
869 context->next_int_cycle = load_int32(buf);
870 context->next_subcode_int_cycle = load_int32(buf);
871 context->last_sector_cycle = load_int32(buf);
872 context->last_nibble_cycle = load_int32(buf);
873 context->next_byte_cycle = load_int32(buf);
874 context->next_subcode_cycle = load_int32(buf);
875 context->current_status_nibble = sign_extend8(load_int8(buf));
876 context->current_cmd_nibble = sign_extend8(load_int8(buf));
877 context->current_sector_byte = sign_extend16(load_int16(buf));
878 context->current_subcode_byte = sign_extend8(load_int8(buf));
879 context->current_subcode_dest = sign_extend8(load_int8(buf));
880 context->head_pba = load_int32(buf);
881 context->seek_pba = load_int32(buf);
882 context->pause_pba = load_int32(buf);
883 context->coarse_seek = load_int32(buf);
884 load_buffer8(buf, (uint8_t *)&context->cmd_buffer, sizeof(context->cmd_buffer));
885 load_buffer8(buf, (uint8_t *)&context->status_buffer, sizeof(context->status_buffer));
886 context->requested_format = load_int8(buf);
887 context->status = load_int8(buf);
888 context->error_status = load_int8(buf);
889 context->requested_track = load_int8(buf);
890 context->cmd_recv_wait = load_int8(buf);
891 context->cmd_recv_pending = load_int8(buf);
892 context->int_pending = load_int8(buf);
893 context->subcode_int_pending = load_int8(buf);
894 context->toc_valid = load_int8(buf);
895 context->first_cmd_received = load_int8(buf);
896 context->seeking = load_int8(buf);
897 context->in_fake_pregap = load_int8(buf);
898 }