76 lines
3.4 KiB
C
76 lines
3.4 KiB
C
#include <string.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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#include "cpu.h"
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#include "ali1429.h"
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static int ali1429_index;
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static uint8_t ali1429_regs[256];
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void ali1429_write(uint16_t port, uint8_t val)
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{
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// return;
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if (!(port&1)) ali1429_index=val;
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else
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{
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ali1429_regs[ali1429_index]=val;
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// pclog("ALI1429 write %02X %02X %04X:%04X %i\n",ali1429_index,val,CS,pc,ins);
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switch (ali1429_index)
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{
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case 0x13:
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/* if (val == 1)
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{
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times = 1;
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ins = 0;
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output = 3;
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}*/
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// pclog("write 13 %02X %i\n",val,shadowbios);
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if (!(val&0xC0))
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{
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shadowbios=0;
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if (!shadowbios_write)
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mem_sethandler(0xf0000, 0x10000, mem_read_bios, mem_read_biosw, mem_read_biosl, NULL, NULL, NULL );
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else
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mem_sethandler(0xf0000, 0x10000, mem_read_bios, mem_read_biosw, mem_read_biosl, mem_write_ram, mem_write_ramw, mem_write_raml);
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flushmmucache();
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}
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break;
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case 0x14:
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shadowbios=val&1;//((val&3)==1);
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shadowbios_write=val&2;
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switch (val & 3)
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{
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case 0: mem_sethandler(0xf0000, 0x10000, mem_read_bios, mem_read_biosw, mem_read_biosl, NULL, NULL, NULL ); break;
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case 1: mem_sethandler(0xf0000, 0x10000, mem_read_ram, mem_read_ramw, mem_read_raml, NULL, NULL, NULL ); break;
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case 2: mem_sethandler(0xf0000, 0x10000, mem_read_bios, mem_read_biosw, mem_read_biosl, mem_write_ram, mem_write_ramw, mem_write_raml); break;
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case 3: mem_sethandler(0xf0000, 0x10000, mem_read_ram, mem_read_ramw, mem_read_raml, mem_write_ram, mem_write_ramw, mem_write_raml); break;
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}
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// if (val==0x43) shadowbios=1;
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// pclog("Shadow bios %i\n",shadowbios);
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flushmmucache();
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break;
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}
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}
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}
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uint8_t ali1429_read(uint16_t port)
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{
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if (!(port&1)) return ali1429_index;
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if ((ali1429_index >= 0xc0 || ali1429_index == 0x20) && cpu_iscyrix)
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return 0xff; /*Don't conflict with Cyrix config registers*/
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return ali1429_regs[ali1429_index];
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}
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void ali1429_reset()
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{
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memset(ali1429_regs,0xFF,256);
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}
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void ali1429_init()
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{
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io_sethandler(0x0022, 0x0002, ali1429_read, NULL, NULL, ali1429_write, NULL, NULL);
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}
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