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Part 2.

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This commit is contained in:
OBattler
2023-07-12 00:32:21 +02:00
parent 22d84443a8
commit 20e771ad3a
3 changed files with 82 additions and 8 deletions
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36
src/chipset/intel_420ex.c
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@@ -41,6 +41,9 @@
#include <86box/machine.h>
#include <86box/chipset.h>
#include <86box/spd.h>
#ifndef USE_DRB_HACK
#include <86box/row.h>
#endif
#define MEM_STATE_SHADOW_R 0x01
#define MEM_STATE_SHADOW_W 0x02
@@ -158,6 +161,27 @@ i420ex_smram_handler_phase1(i420ex_t *dev)
(regs[0x70] & 0x70) == 0x40, !(regs[0x70] & 0x20));
}
#ifndef USE_DRB_HACK
static void
i420ex_drb_recalc(i420ex_t *dev)
{
int i;
uint32_t boundary, shift;
for (i = 4; i >= 0; i--)
row_disable(i);
for (i = 0; i <= 4; i++) {
shift = (i & 1) << 2;
boundary = ((uint32_t) dev->regs[0x60 + i]) & 0xff;
row_set_boundary(i, boundary);
}
flushmmucache();
}
#endif
static void
i420ex_write(int func, int addr, uint8_t val, void *priv)
{
@@ -289,7 +313,12 @@ i420ex_write(int func, int addr, uint8_t val, void *priv)
case 0x62:
case 0x63:
case 0x64:
#ifdef USE_DRB_HACK
spd_write_drbs(dev->regs, 0x60, 0x64, 1);
#else
dev->regs[addr] = val;
i420ex_drb_recalc(dev);
#endif
break;
case 0x66:
case 0x67:
@@ -452,7 +481,7 @@ i420ex_reset(void *priv)
i420ex_write(0, 0x59 + i, 0x00, priv);
for (uint8_t i = 0; i <= 4; i++)
i420ex_write(0, 0x60 + i, 0x01, priv);
dev->regs[0x60 + i] = 0x01;
dev->regs[0x70] &= 0xef; /* Forcibly unlock the SMRAM register. */
dev->smram_locked = 0;
@@ -530,6 +559,11 @@ i420ex_init(const device_t *info)
device_add(&ide_pci_2ch_device);
#ifndef USE_DRB_HACK
row_device.local = 4 | (1 << 8) | (0x01 << 16) | (8 << 24);
device_add((const device_t *) &row_device);
#endif
i420ex_reset_hard(dev);
return dev;