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Added init functions to z80_util.c so new Z80 core is closer to a drop in replacement for the old one
author Michael Pavone <pavone@retrodev.com>
date Thu, 07 Feb 2019 09:43:25 -0800
parents ca2336469397
children 01236179fc71
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48a43dff4dc0 Added init functions to z80_util.c so new Z80 core is closer to a drop in replacement for the old one
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1 #include <string.h>
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3 void z80_read_8(z80_context *context)
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4 {
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5 context->cycles += 3 * context->opts->gen.clock_divider;
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6 context->scratch1 = read_byte(context->scratch1, NULL, &context->opts->gen, context);
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7 }
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9 void z80_write_8(z80_context *context)
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10 {
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11 context->cycles += 3 * context->opts->gen.clock_divider;
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12 write_byte(context->scratch2, context->scratch1, NULL, &context->opts->gen, context);
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13 }
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15 void z80_io_read8(z80_context *context)
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16 {
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17 uint32_t tmp_mask = context->opts->gen.address_mask;
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18 memmap_chunk const *tmp_map = context->opts->gen.memmap;
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19 uint32_t tmp_chunks = context->opts->gen.memmap_chunks;
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21 context->opts->gen.address_mask = context->io_mask;
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22 context->opts->gen.memmap = context->io_map;
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23 context->opts->gen.memmap_chunks = context->io_chunks;
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25 context->scratch1 = read_byte(context->scratch1, NULL, &context->opts->gen, context);
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26
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27 context->opts->gen.address_mask = tmp_mask;
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28 context->opts->gen.memmap = tmp_map;
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29 context->opts->gen.memmap_chunks = tmp_chunks;
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30 }
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32 void z80_io_write8(z80_context *context)
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33 {
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34 uint32_t tmp_mask = context->opts->gen.address_mask;
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35 memmap_chunk const *tmp_map = context->opts->gen.memmap;
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36 uint32_t tmp_chunks = context->opts->gen.memmap_chunks;
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37
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38 context->opts->gen.address_mask = context->io_mask;
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39 context->opts->gen.memmap = context->io_map;
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40 context->opts->gen.memmap_chunks = context->io_chunks;
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41
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42 write_byte(context->scratch2, context->scratch1, NULL, &context->opts->gen, context);
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44 context->opts->gen.address_mask = tmp_mask;
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45 context->opts->gen.memmap = tmp_map;
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46 context->opts->gen.memmap_chunks = tmp_chunks;
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47 }
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49 //quick hack until I get a chance to change which init method these get passed to
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50 static memmap_chunk const * tmp_io_chunks;
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51 static uint32_t tmp_num_io_chunks, tmp_io_mask;
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52 void init_z80_opts(z80_options * options, memmap_chunk const * chunks, uint32_t num_chunks, memmap_chunk const * io_chunks, uint32_t num_io_chunks, uint32_t clock_divider, uint32_t io_address_mask)
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53 {
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54 memset(options, 0, sizeof(*options));
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55 options->gen.memmap = chunks;
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56 options->gen.memmap_chunks = num_chunks;
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57 options->gen.address_mask = 0xFFFF;
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58 options->gen.max_address = 0xFFFF;
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59 options->gen.clock_divider = clock_divider;
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60 tmp_io_chunks = io_chunks;
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61 tmp_num_io_chunks = num_io_chunks;
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62 tmp_io_mask = io_address_mask;
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63 }
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64
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65 z80_context * init_z80_context(z80_options *options)
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66 {
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67 z80_context *context = calloc(1, sizeof(z80_context));
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68 context->opts = options;
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69 context->io_map = (memmap_chunk *)tmp_io_chunks;
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70 context->io_chunks = tmp_num_io_chunks;
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71 context->io_mask = tmp_io_mask;
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72 return context;
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73 }
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74