af03793533
Fixed the emulation of the Intel 82335 chip used by the Phoenix 386 clone; Fixed a bug regarding the CGA RGB monitor type; The IBM PS/1 Model 2121 with ISA is now acknowledged in mem.c.
136 lines
2.4 KiB
C
136 lines
2.4 KiB
C
/* Intel 82335 SX emulation, used by the Phoenix 386 clone. */
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#include <stdint.h>
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#include "ibm.h"
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#include "io.h"
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#include "mem.h"
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typedef struct
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{
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uint8_t reg_22;
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uint8_t reg_23;
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} i82335_t;
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i82335_t i82335;
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uint8_t i82335_read(uint16_t addr, void *priv);
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void i82335_write(uint16_t addr, uint8_t val, void *priv)
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{
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int i = 0;
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int mem_write = 0;
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// pclog("i82335_write(%04X, %02X)\n", addr, val);
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switch (addr)
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{
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case 0x22:
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if ((val ^ i82335.reg_22) & 1)
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{
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if (val & 1)
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{
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for (i = 0; i < 8; i++)
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{
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mem_set_mem_state(0xe0000, 0x20000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
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shadowbios = 1;
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}
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}
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else
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{
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for (i = 0; i < 8; i++)
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{
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mem_set_mem_state(0xe0000, 0x20000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
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shadowbios = 0;
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}
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}
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flushmmucache();
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}
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i82335.reg_22 = val | 0xd8;
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break;
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case 0x23:
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i82335.reg_23 = val;
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if ((val ^ i82335.reg_22) & 2)
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{
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if (val & 2)
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{
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for (i = 0; i < 8; i++)
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{
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mem_set_mem_state(0xc0000, 0x20000, MEM_READ_INTERNAL | MEM_WRITE_INTERNAL);
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shadowbios = 1;
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}
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}
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else
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{
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for (i = 0; i < 8; i++)
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{
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mem_set_mem_state(0xc0000, 0x20000, MEM_READ_EXTERNAL | MEM_WRITE_EXTERNAL);
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shadowbios = 0;
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}
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}
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}
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if ((val ^ i82335.reg_22) & 0xc)
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{
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if (val & 2)
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{
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for (i = 0; i < 8; i++)
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{
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mem_write = (val & 8) ? MEM_WRITE_DISABLED : MEM_WRITE_INTERNAL;
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mem_set_mem_state(0xa0000, 0x20000, MEM_READ_INTERNAL | mem_write);
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shadowbios = 1;
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}
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}
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else
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{
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for (i = 0; i < 8; i++)
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{
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mem_write = (val & 8) ? MEM_WRITE_DISABLED : MEM_WRITE_EXTERNAL;
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mem_set_mem_state(0xa0000, 0x20000, MEM_READ_EXTERNAL | mem_write);
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shadowbios = 0;
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}
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}
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}
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if ((val ^ i82335.reg_22) & 0xe)
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{
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flushmmucache();
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}
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if (val & 0x80)
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{
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io_removehandler(0x0022, 0x0001, i82335_read, NULL, NULL, i82335_write, NULL, NULL, NULL);
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}
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break;
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}
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}
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uint8_t i82335_read(uint16_t addr, void *priv)
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{
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// pclog("i82335_read(%04X)\n", addr);
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if (addr == 0x22)
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{
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return i82335.reg_22;
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}
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else if (addr == 0x23)
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{
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return i82335.reg_23;
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}
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else
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{
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return 0;
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}
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}
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void i82335_init()
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{
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memset(&i82335, 0, sizeof(i82335_t));
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i82335.reg_22 = 0xd8;
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io_sethandler(0x0022, 0x0014, i82335_read, NULL, NULL, i82335_write, NULL, NULL, NULL);
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}
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