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Implemented ATAPI DMA transfer modes.

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This commit is contained in:
SarahW 2018-03-15 19:36:30 +00:00
commit 6602368cc4
9 changed files with 289 additions and 54 deletions
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62
src/scsi_cd.c
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@ -3,6 +3,7 @@
#include <stdlib.h>
#include <string.h>
#include "ibm.h"
#include "ide.h"
#include "ide_atapi.h"
#include "scsi.h"
#include "scsi_cd.h"
@ -194,6 +195,8 @@ typedef struct scsi_cd_data_t
int is_atapi;
atapi_device_t *atapi_dev;
int pio_mode, mdma_mode;
} scsi_cd_data_t;
static void scsi_add_data(scsi_cd_data_t *data, uint8_t val)
@ -1171,16 +1174,72 @@ static int scsi_cd_get_bytes_required(void *p)
static void scsi_cd_atapi_identify(uint16_t *buffer, void *p)
{
scsi_cd_data_t *data = p;
memset(buffer, 0, 512);
buffer[0] = 0x8000 | (5<<8) | 0x80 | (2<<5); /* ATAPI device, CD-ROM drive, removable media, accelerated DRQ */
ide_padstr((char *)(buffer + 10), "", 20); /* Serial Number */
ide_padstr((char *)(buffer + 23), "v1.0", 8); /* Firmware */
ide_padstr((char *)(buffer + 27), "PCemCD", 40); /* Model */
buffer[49] = 0x200; /* LBA supported */
buffer[49] = 0x300; /*DMA and LBA supported*/
buffer[51] = 120;
buffer[52] = 120;
buffer[53] = 2; /*Words 64-70 are valid*/
buffer[62] = 0x0000;
buffer[63] = 0x0007 | (0x100 << data->mdma_mode); /*Multi-word DMA 0, 1 & 2*/
buffer[64] = 0x0003; /*PIO Modes 3 & 4*/
if (data->pio_mode >= 3)
buffer[64] |= (0x100 << (data->pio_mode - 3));
buffer[65] = 120; /*Minimum multi-word cycle time*/
buffer[66] = 120; /*Recommended multi-word cycle time*/
buffer[67] = 120; /*Minimum PIO cycle time*/
buffer[126] = 0xfffe; /* Interpret zero byte count limit as maximum length */
}
static int scsi_cd_atapi_set_feature(uint8_t feature, uint8_t val, void *p)
{
scsi_cd_data_t *data = p;
switch (feature)
{
case FEATURE_SET_TRANSFER_MODE:
if (!(val & 0xfe))
{
/*Default transfer mode*/
data->pio_mode = 0;
return 1;
}
else if ((val & 0xf8) == 0x08)
{
/*PIO transfer mode*/
if ((val & 7) > 4)
return 0;
data->pio_mode = (val & 7);
return 1;
}
else if ((val & 0xf8) == 0x20)
{
/*Multi-word DMA transfer mode*/
if ((val & 7) > 2)
return 0;
data->mdma_mode = (val & 7);
return 1;
}
return 0; /*Invalid data*/
case FEATURE_ENABLE_IRQ_OVERLAPPED:
case FEATURE_ENABLE_IRQ_SERVICE:
case FEATURE_DISABLE_REVERT:
case FEATURE_DISABLE_IRQ_OVERLAPPED:
case FEATURE_DISABLE_IRQ_SERVICE:
case FEATURE_ENABLE_REVERT:
return 1;
}
return 0; /*Feature not supported*/
}
scsi_device_t scsi_cd =
{
scsi_cd_init,
@ -1195,6 +1254,7 @@ scsi_device_t scsi_cd =
scsi_cd_get_bytes_required,
scsi_cd_atapi_identify,
scsi_cd_atapi_set_feature,
scsi_cd_read,
scsi_cd_write,