abf009e541
Moved CD-ROM read data buffer declaration and definitions to SCSI source files and headers, but still applying to IDE when needed. SCSI Read commands now return the correct sectors on callback. DMA bug fixes.
112 lines
2.9 KiB
C
112 lines
2.9 KiB
C
/* Copyright holders: SA1988, Tenshi
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see COPYING for more details
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*/
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/*SCSI layer emulation*/
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#include <stdlib.h>
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#include <string.h>
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#include "86box.h"
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#include "ibm.h"
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#include "device.h"
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#include "cdrom.h"
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#include "scsi.h"
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#include "timer.h"
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int SCSICallback[7] = {0,0,0,0,0,0,0};
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uint8_t scsi_cdrom_id = 3; /*common setting*/
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//Get the transfer length of the command
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void SCSIGetLength(uint8_t id, int *datalen)
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{
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*datalen = SCSIDevices[id].CmdBufferLength;
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}
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//Execute SCSI command
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void SCSIExecCommand(uint8_t id, uint8_t *cdb)
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{
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SCSICDROM_Command(id, cdb);
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}
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//Read pending data from the resulting SCSI command
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void SCSIReadData(uint8_t id, uint8_t *cdb, uint8_t *data, int datalen)
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{
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SCSICDROM_ReadData(id, cdb, data, datalen);
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}
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//Write pending data to the resulting SCSI command
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void SCSIWriteData(uint8_t id, uint8_t *cdb, uint8_t *data, int datalen)
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{
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SCSICDROM_WriteData(id, cdb, data, datalen);
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}
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/////
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void SCSIDMAResetPosition(uint8_t Id)
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{
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//Reset position in memory after reaching the
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SCSIDevices[Id].pos = 0;
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}
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//Read data from buffer with given position in buffer memory
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void SCSIRead(uint8_t Id, uint32_t len_size)
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{
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if (!len_size) //If there's no data, don't try to do anything.
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return;
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int c;
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for (c = 0; c <= len_size; c++) //Count as many bytes as the length of the buffer is requested
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{
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memcpy(SCSIDevices[Id].CmdBuffer, SCSIDevices[Id].CmdBuffer + SCSIDevices[Id].pos, len_size);
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SCSIDevices[Id].pos = c;
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//pclog("SCSI Read: position at %i\n", SCSIDevices[Id].pos);
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}
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}
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//Write data to buffer with given position in buffer memory
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void SCSIWrite(uint8_t Id, uint32_t len_size)
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{
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if (!len_size) //If there's no data, don't try to do anything.
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return;
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int c;
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for (c = 0; c <= len_size; c++) //Count as many bytes as the length of the buffer is requested
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{
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memcpy(SCSIDevices[Id].CmdBuffer + SCSIDevices[Id].pos, SCSIDevices[Id].CmdBuffer, len_size);
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SCSIDevices[Id].pos = c;
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//Mode Sense/Select stuff
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if ((SCSIDevices[Id].pos >= prefix_len+4) && (page_flags[page_current] & PAGE_CHANGEABLE))
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{
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mode_pages_in[page_current][SCSIDevices[Id].pos - prefix_len - 4] = SCSIDevices[Id].CmdBuffer[SCSIDevices[Id].pos - 2];
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mode_pages_in[page_current][SCSIDevices[Id].pos - prefix_len - 3] = SCSIDevices[Id].CmdBuffer[SCSIDevices[Id].pos - 1];
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}
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//pclog("SCSI Write: position at %i\n", SCSIDevices[Id].pos);
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}
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}
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/////
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//Initialization function for the SCSI layer
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void SCSIReset(uint8_t Id)
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{
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page_flags[GPMODE_CDROM_AUDIO_PAGE] &= 0xFD; /* Clear changed flag for CDROM AUDIO mode page. */
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memset(mode_pages_in[GPMODE_CDROM_AUDIO_PAGE], 0, 256); /* Clear the page itself. */
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if (cdrom_enabled && scsi_cdrom_enabled)
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{
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SCSICallback[Id]=0;
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SCSIDevices[Id].LunType = SCSI_CDROM;
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}
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else
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{
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SCSIDevices[Id].LunType = SCSI_NONE;
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}
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page_flags[GPMODE_CDROM_AUDIO_PAGE] &= ~PAGE_CHANGED;
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SCSISense.UnitAttention = 0;
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}
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