80486DX2-66/86Box-fork
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An actual implementation of the PCSCSI PAD command, per suggestion by TC1995 - fixes booting from CD-ROM in emulation mode.

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This commit is contained in:
OBattler
2022-11-05 20:15:34 +01:00
parent bcce95caf5
commit ff3e0f428a
1 changed files with 17 additions and 5 deletions
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22
src/scsi/scsi_pcscsi.c
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@@ -518,7 +518,9 @@ esp_dma_enable(esp_t *dev, int level)
esp_log("ESP DMA Enabled\n");
dev->dma_enabled = 1;
dev->dma_86c01.status |= 0x02;
if ((dev->rregs[ESP_CMD] & CMD_CMD) != CMD_TI) {
timer_stop(&dev->timer);
if (((dev->rregs[ESP_CMD] & CMD_CMD) != CMD_TI) &&
((dev->rregs[ESP_CMD] & CMD_CMD) != CMD_PAD)) {
timer_on_auto(&dev->timer, 40.0);
} else {
esp_log("Period = %lf\n", dev->period);
@@ -924,6 +926,7 @@ esp_write_response(esp_t *dev)
buf[0] = dev->status;
buf[1] = 0;
esp_log("esp_write_response(): %02X %02X\n", buf[0], buf[1]);
if (dev->dma) {
if (dev->mca) {
@@ -953,10 +956,13 @@ esp_callback(void *p)
{
esp_t *dev = (esp_t *) p;
if (dev->dma_enabled || dev->do_cmd) {
if (dev->dma_enabled || dev->do_cmd || ((dev->rregs[ESP_CMD] & CMD_CMD) == CMD_PAD)) {
if ((dev->rregs[ESP_CMD] & CMD_CMD) == CMD_TI) {
esp_log("ESP SCSI Handle TI Callback\n");
handle_ti(dev);
} else if ((dev->rregs[ESP_CMD] & CMD_CMD) == CMD_PAD) {
esp_log("ESP SCSI Handle PAD Callback\n");
handle_ti(dev);
}
}
@@ -1084,6 +1090,7 @@ esp_reg_write(esp_t *dev, uint32_t saddr, uint32_t val)
}
break;
case CMD_TI:
esp_log("val = %02X\n", val);
break;
case CMD_SEL:
handle_s_without_atn(dev);
@@ -1107,9 +1114,9 @@ esp_reg_write(esp_t *dev, uint32_t saddr, uint32_t val)
esp_raise_irq(dev);
break;
case CMD_PAD:
dev->rregs[ESP_RSTAT] = STAT_TC;
dev->rregs[ESP_RINTR] |= INTR_FC;
dev->rregs[ESP_RSEQ] = 0;
esp_log("val = %02X\n", val);
timer_stop(&dev->timer);
timer_on_auto(&dev->timer, dev->period);
esp_log("ESP Transfer Pad\n");
break;
case CMD_SATN:
@@ -1173,6 +1180,9 @@ esp_pci_dma_memory_rw(esp_t *dev, uint8_t *buf, uint32_t len, int dir)
} else {
dma_bm_read(dev->dma_regs[DMA_SPA], buf, len, 4);
}
esp_log("DMA: Address = %08X, Length = %08X (%02X %02X %02X %02X -> %02X %02X %02X %02X)\n", dev->dma_regs[DMA_SPA], len,
ram[dev->dma_regs[DMA_SPA]], ram[dev->dma_regs[DMA_SPA] + 1], ram[dev->dma_regs[DMA_SPA] + 2], ram[dev->dma_regs[DMA_SPA] + 3],
buf[0], buf[1], buf[2], buf[3]);
/* update status registers */
dev->dma_regs[DMA_WBC] -= len;
@@ -1215,6 +1225,7 @@ esp_pci_dma_write(esp_t *dev, uint16_t saddr, uint32_t val)
switch (val & DMA_CMD_MASK) {
case 0: /*IDLE*/
esp_dma_enable(dev, 0);
esp_log("PCI DMA disable\n");
break;
case 1: /*BLAST*/
break;
@@ -1227,6 +1238,7 @@ esp_pci_dma_write(esp_t *dev, uint16_t saddr, uint32_t val)
dev->dma_regs[DMA_WMAC] = dev->dma_regs[DMA_SMDLA];
dev->dma_regs[DMA_STAT] &= ~(DMA_STAT_BCMBLT | DMA_STAT_SCSIINT | DMA_STAT_DONE | DMA_STAT_ABORT | DMA_STAT_ERROR | DMA_STAT_PWDN);
esp_dma_enable(dev, 1);
esp_log("PCI DMA enable\n");
break;
default: /* can't happen */
abort();