diff options
Diffstat (limited to 'z80_util.c')
| -rw-r--r-- | z80_util.c | 151 |
1 files changed, 145 insertions, 6 deletions
@@ -7,7 +7,7 @@ void z80_read_8(z80_context *context) if (fast) { context->scratch1 = fast[context->scratch1 & 0x3FF]; } else { - context->scratch1 = read_byte(context->scratch1, NULL, &context->opts->gen, context); + context->scratch1 = read_byte(context->scratch1, (void **)context->mem_pointers, &context->opts->gen, context); } } @@ -18,7 +18,7 @@ void z80_write_8(z80_context *context) if (fast) { fast[context->scratch2 & 0x3FF] = context->scratch1; } else { - write_byte(context->scratch2, context->scratch1, NULL, &context->opts->gen, context); + write_byte(context->scratch2, context->scratch1, (void **)context->mem_pointers, &context->opts->gen, context); } } @@ -32,7 +32,7 @@ void z80_io_read8(z80_context *context) context->opts->gen.memmap = context->io_map; context->opts->gen.memmap_chunks = context->io_chunks; - context->scratch1 = read_byte(context->scratch1, NULL, &context->opts->gen, context); + context->scratch1 = read_byte(context->scratch1, (void **)context->mem_pointers, &context->opts->gen, context); context->opts->gen.address_mask = tmp_mask; context->opts->gen.memmap = tmp_map; @@ -49,7 +49,7 @@ void z80_io_write8(z80_context *context) context->opts->gen.memmap = context->io_map; context->opts->gen.memmap_chunks = context->io_chunks; - write_byte(context->scratch2, context->scratch1, NULL, &context->opts->gen, context); + write_byte(context->scratch2, context->scratch1, (void **)context->mem_pointers, &context->opts->gen, context); context->opts->gen.address_mask = tmp_mask; context->opts->gen.memmap = tmp_map; @@ -72,6 +72,11 @@ void init_z80_opts(z80_options * options, memmap_chunk const * chunks, uint32_t tmp_io_mask = io_address_mask; } +void z80_options_free(z80_options *opts) +{ + free(opts); +} + z80_context * init_z80_context(z80_options *options) { z80_context *context = calloc(1, sizeof(z80_context)); @@ -79,11 +84,12 @@ z80_context * init_z80_context(z80_options *options) context->io_map = (memmap_chunk *)tmp_io_chunks; context->io_chunks = tmp_num_io_chunks; context->io_mask = tmp_io_mask; + context->int_cycle = context->nmi_cycle = 0xFFFFFFFFU; for(uint32_t address = 0; address < 0x10000; address+=1024) { - uint8_t *start = get_native_pointer(address, NULL, &options->gen); + uint8_t *start = get_native_pointer(address, (void**)context->mem_pointers, &options->gen); if (start) { - uint8_t *end = get_native_pointer(address + 1023, NULL, &options->gen); + uint8_t *end = get_native_pointer(address + 1023, (void**)context->mem_pointers, &options->gen); if (end && end - start == 1023) { context->fastmem[address >> 10] = start; } @@ -92,3 +98,136 @@ z80_context * init_z80_context(z80_options *options) return context; } +uint32_t z80_sync_cycle(z80_context *context, uint32_t target_cycle) +{ + if (context->iff1 && context->int_cycle < target_cycle) { + target_cycle = context->int_cycle; + }; + if (context->nmi_cycle < target_cycle) { + target_cycle = context->nmi_cycle; + } + return target_cycle; +} + +void z80_run(z80_context *context, uint32_t target_cycle) +{ + if (context->reset || context->busack) { + context->cycles = target_cycle; + } else if (target_cycle > context->cycles) { + if (context->busreq) { + //busreq is sampled at the end of an m-cycle + //we can approximate that by running for a single m-cycle after a bus request + target_cycle = context->cycles + 4 * context->opts->gen.clock_divider; + } + z80_execute(context, target_cycle); + if (context->busreq) { + context->busack = 1; + } + } +} + +void z80_assert_reset(z80_context * context, uint32_t cycle) +{ + z80_run(context, cycle); + context->reset = 1; +} + +void z80_clear_reset(z80_context * context, uint32_t cycle) +{ + z80_run(context, cycle); + if (context->reset) { + context->imode = 0; + context->iff1 = context->iff2 = 0; + context->pc = 0; + context->reset = 0; + if (context->busreq) { + //TODO: Figure out appropriate delay + context->busack = 1; + } + } +} + +#define MAX_MCYCLE_LENGTH 6 +void z80_assert_busreq(z80_context * context, uint32_t cycle) +{ + z80_run(context, cycle); + context->busreq = 1; + //this is an imperfect aproximation since most M-cycles take less tstates than the max + //and a short 3-tstate m-cycle can take an unbounded number due to wait states + if (context->cycles - cycle > MAX_MCYCLE_LENGTH * context->opts->gen.clock_divider) { + context->busack = 1; + } +} + +void z80_clear_busreq(z80_context * context, uint32_t cycle) +{ + z80_run(context, cycle); + context->busreq = 0; + context->busack = 0; + //there appears to be at least a 1 Z80 cycle delay between busreq + //being released and resumption of execution + context->cycles += context->opts->gen.clock_divider; +} + +void z80_assert_nmi(z80_context *context, uint32_t cycle) +{ + context->nmi_cycle = cycle; +} + +uint8_t z80_get_busack(z80_context * context, uint32_t cycle) +{ + z80_run(context, cycle); + return context->busack; +} + +void z80_invalidate_code_range(z80_context *context, uint32_t startA, uint32_t endA) +{ + for(startA &= ~0x3FF; startA += 1024; startA < endA) + { + uint8_t *start = get_native_pointer(startA, (void**)context->mem_pointers, &context->opts->gen); + if (start) { + uint8_t *end = get_native_pointer(startA + 1023, (void**)context->mem_pointers, &context->opts->gen); + if (!end || end - start != 1023) { + start = NULL; + } + } + context->fastmem[startA >> 10] = start; + } +} + +void z80_adjust_cycles(z80_context * context, uint32_t deduction) +{ + context->cycles -= deduction; + if (context->int_cycle != 0xFFFFFFFFU) { + if (context->int_cycle > deduction) { + context->int_cycle -= deduction; + } else { + context->int_cycle = 0; + } + } + if (context->nmi_cycle != 0xFFFFFFFFU) { + if (context->nmi_cycle > deduction) { + context->nmi_cycle -= deduction; + } else { + context->nmi_cycle = 0; + } + } +} + +void z80_serialize(z80_context *context, serialize_buffer *buf) +{ + //TODO: Implement me +} + +void z80_deserialize(deserialize_buffer *buf, void *vcontext) +{ + //TODO: Implement me +} + +void zinsert_breakpoint(z80_context * context, uint16_t address, uint8_t * bp_handler) +{ +} + +void zremove_breakpoint(z80_context * context, uint16_t address) +{ +} |