74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
/* Copyright holders: Sarah Walker
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see COPYING for more details
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*/
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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 "pci.h"
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#include "um8881f.h"
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static uint8_t card_16[256];
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static uint8_t card_18[256];
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void um8881f_write(int func, int addr, uint8_t val, void *priv)
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{
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// pclog("um8881f_write : addr=%02x val=%02x %04x:%04x\n", addr, val, CS, pc);
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if (addr == 0x54)
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{
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/* if ((card_16[0x54] ^ val) & 0x01)
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{
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if (val & 1)
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mem_bios_set_state(0xe0000, 0x10000, 1, 1);
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else
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mem_bios_set_state(0xe0000, 0x10000, 0, 0);
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}*/
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flushmmucache_nopc();
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}
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if (addr == 0x55)
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{
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if ((card_16[0x55] ^ val) & 0xc0)
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{
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/* switch (val & 0xc0)
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{
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case 0x00: mem_bios_set_state(0xf0000, 0x10000, 0, 1); break;
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case 0x40: mem_bios_set_state(0xf0000, 0x10000, 0, 0); break;
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case 0x80: mem_bios_set_state(0xf0000, 0x10000, 1, 1); break;
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case 0xc0: mem_bios_set_state(0xf0000, 0x10000, 1, 0); break;
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}*/
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shadowbios = val & 0x80;
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shadowbios_write = !(val & 0x40);
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flushmmucache_nopc();
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}
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}
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if (addr >= 4)
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card_16[addr] = val;
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}
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uint8_t um8881f_read(int func, int addr, void *priv)
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{
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return card_16[addr];
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}
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void um8886f_write(int func, int addr, uint8_t val, void *priv)
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{
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if (addr >= 4)
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card_18[addr] = val;
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}
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uint8_t um8886f_read(int func, int addr, void *priv)
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{
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return card_18[addr];
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}
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void um8881f_init()
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{
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pci_add_specific(16, um8881f_read, um8881f_write, NULL);
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pci_add_specific(18, um8886f_read, um8886f_write, NULL);
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card_16[0] = card_18[0] = 0x60; /*UMC*/
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card_16[1] = card_18[1] = 0x10;
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card_16[2] = 0x81; card_16[3] = 0x88; /*UM8881 Host - PCI bridge*/
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card_18[2] = 0x86; card_18[3] = 0x88; /*UM8886 PCI - ISA bridge*/
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}
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