68a2d8cb3c
As part of this, added emulation of the GD5428-based IBM 1MB SVGA Adapter/A, along with support for external graphics cards on MCA platforms, adding the ability to override the onboard VGA controller.
80 lines
2 KiB
C
80 lines
2 KiB
C
#include "ibm.h"
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#include "io.h"
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#include "mem.h"
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#include "mca.h"
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void (*mca_card_write[8])(int addr, uint8_t val, void *priv);
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uint8_t (*mca_card_read[8])(int addr, void *priv);
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void (*mca_card_reset[8])(void *priv);
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void *mca_priv[8];
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static int mca_index;
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static int mca_nr_cards;
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void mca_init(int nr_cards)
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{
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int c;
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MCA = 1;
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for (c = 0; c < 8; c++)
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{
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mca_card_read[c] = NULL;
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mca_card_write[c] = NULL;
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mca_card_reset[c] = NULL;
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mca_priv[c] = NULL;
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}
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mca_index = 0;
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mca_nr_cards = nr_cards;
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}
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void mca_set_index(int index)
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{
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mca_index = index;
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}
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uint8_t mca_read(uint16_t port)
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{
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if (mca_index >= mca_nr_cards)
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return 0xff;
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if (!mca_card_read[mca_index])
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return 0xff;
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return mca_card_read[mca_index](port, mca_priv[mca_index]);
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}
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void mca_write(uint16_t port, uint8_t val)
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{
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if (mca_index >= mca_nr_cards)
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return;
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if (mca_card_write[mca_index])
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mca_card_write[mca_index](port, val, mca_priv[mca_index]);
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}
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void mca_reset(void)
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{
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int c;
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for (c = 0; c < 8; c++)
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{
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if (mca_card_reset[c])
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mca_card_reset[c](mca_priv[c]);
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}
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}
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void mca_add(uint8_t (*read)(int addr, void *priv), void (*write)(int addr, uint8_t val, void *priv), void (*reset)(void *priv), void *priv)
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{
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int c;
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for (c = 0; c < mca_nr_cards; c++)
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{
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if (!mca_card_read[c] && !mca_card_write[c])
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{
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mca_card_read[c] = read;
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mca_card_write[c] = write;
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mca_card_reset[c] = reset;
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mca_priv[c] = priv;
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return;
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}
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}
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}
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