mirror of
https://github.com/kanjitalk755/macemu.git
synced 2024-06-01 22:41:29 +00:00
290 lines
7.0 KiB
C++
290 lines
7.0 KiB
C++
/*
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* scsi_amiga.cpp - SCSI Manager, Amiga specific stuff
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*
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* Basilisk II (C) 1997-2008 Christian Bauer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <exec/types.h>
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#include <exec/memory.h>
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#include <devices/trackdisk.h>
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#include <devices/scsidisk.h>
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#define __USE_SYSBASE
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#include <proto/exec.h>
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#include <inline/exec.h>
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#include "sysdeps.h"
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#include "main.h"
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#include "prefs.h"
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#include "user_strings.h"
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#include "scsi.h"
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#define DEBUG 0
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#include "debug.h"
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// Global variables
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static struct SCSICmd scsi;
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static IOStdReq *ios[8*8]; // IORequests for 8 units and 8 LUNs each
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static IOStdReq *io; // Active IORequest (selected target)
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static struct MsgPort *the_port = NULL; // Message port for device communication
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static ULONG buffer_size; // Size of data buffer
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static UBYTE *buffer = NULL; // Pointer to data buffer
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static ULONG buffer_memf; // Buffer memory flags
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static UBYTE cmd_buffer[12]; // Buffer for SCSI command
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const int SENSE_LENGTH = 256;
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static UBYTE *sense_buffer = NULL; // Buffer for autosense data
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static bool direct_transfers_supported = false; // Direct data transfers (bypassing the buffer) are supported
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/*
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* Initialization
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*/
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void SCSIInit(void)
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{
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int id, lun;
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int memtype = PrefsFindInt32("scsimemtype");
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switch (memtype) {
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case 1:
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buffer_memf = MEMF_24BITDMA | MEMF_PUBLIC;
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break;
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case 2:
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buffer_memf = MEMF_ANY | MEMF_PUBLIC;
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direct_transfers_supported = true;
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break;
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default:
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buffer_memf = MEMF_CHIP | MEMF_PUBLIC;
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break;
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}
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// Create port and buffers
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the_port = CreateMsgPort();
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buffer = (UBYTE *)AllocMem(buffer_size = 0x10000, buffer_memf);
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sense_buffer = (UBYTE *)AllocMem(SENSE_LENGTH, MEMF_CHIP | MEMF_PUBLIC);
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if (the_port == NULL || buffer == NULL || sense_buffer == NULL) {
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ErrorAlert(STR_NO_MEM_ERR);
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QuitEmulator();
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}
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// Create and open IORequests for all 8 units (and all 8 LUNs)
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for (id=0; id<8; id++) {
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for (lun=0; lun<8; lun++)
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ios[id*8+lun] = NULL;
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char prefs_name[16];
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sprintf(prefs_name, "scsi%d", id);
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const char *str = PrefsFindString(prefs_name);
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if (str) {
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char dev_name[256];
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ULONG dev_unit = 0;
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if (sscanf(str, "%[^/]/%ld", dev_name, &dev_unit) == 2) {
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for (lun=0; lun<8; lun++) {
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struct IOStdReq *io = (struct IOStdReq *)CreateIORequest(the_port, sizeof(struct IOStdReq));
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if (io == NULL)
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continue;
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if (OpenDevice((UBYTE *) dev_name, dev_unit + lun * 10, (struct IORequest *)io, 0)) {
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DeleteIORequest(io);
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continue;
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}
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io->io_Data = &scsi;
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io->io_Length = sizeof(scsi);
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io->io_Command = HD_SCSICMD;
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ios[id*8+lun] = io;
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}
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}
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}
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}
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// Reset SCSI bus
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SCSIReset();
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// Init SCSICmd
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memset(&scsi, 0, sizeof(scsi));
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scsi.scsi_Command = cmd_buffer;
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scsi.scsi_SenseData = sense_buffer;
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scsi.scsi_SenseLength = SENSE_LENGTH;
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}
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/*
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* Deinitialization
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*/
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void SCSIExit(void)
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{
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// Close all devices
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for (int i=0; i<8; i++)
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for (int j=0; j<8; j++) {
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struct IOStdReq *io = ios[i*8+j];
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if (io) {
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CloseDevice((struct IORequest *)io);
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DeleteIORequest(io);
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}
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}
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// Delete port and buffers
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if (the_port)
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DeleteMsgPort(the_port);
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if (buffer)
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FreeMem(buffer, buffer_size);
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if (sense_buffer)
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FreeMem(sense_buffer, SENSE_LENGTH);
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}
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/*
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* Check if requested data size fits into buffer, allocate new buffer if needed
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*/
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static bool try_buffer(int size)
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{
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if (size <= buffer_size)
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return true;
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UBYTE *new_buffer = (UBYTE *)AllocMem(size, buffer_memf);
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if (new_buffer == NULL)
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return false;
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FreeMem(buffer, buffer_size);
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buffer = new_buffer;
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buffer_size = size;
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return true;
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}
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/*
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* Set SCSI command to be sent by scsi_send_cmd()
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*/
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void scsi_set_cmd(int cmd_length, uint8 *cmd)
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{
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scsi.scsi_CmdLength = cmd_length;
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memcpy(cmd_buffer, cmd, cmd_length);
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}
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/*
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* Check for presence of SCSI target
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*/
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bool scsi_is_target_present(int id)
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{
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return ios[id * 8] != NULL;
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}
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/*
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* Set SCSI target (returns false on error)
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*/
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bool scsi_set_target(int id, int lun)
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{
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struct IOStdReq *new_io = ios[id * 8 + lun];
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if (new_io == NULL)
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return false;
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if (new_io != io)
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scsi.scsi_SenseActual = 0; // Clear sense data when selecting new target
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io = new_io;
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return true;
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}
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/*
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* Send SCSI command to active target (scsi_set_command() must have been called),
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* read/write data according to S/G table (returns false on error); timeout is in 1/60 sec
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*/
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bool scsi_send_cmd(size_t data_length, bool reading, int sg_size, uint8 **sg_ptr, uint32 *sg_len, uint16 *stat, uint32 timeout)
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{
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// Bypass the buffer if there's only one S/G table entry
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bool do_direct_transfer = (sg_size == 1 && ((uint32)sg_ptr[0] & 1) == 0 && direct_transfers_supported);
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if (!do_direct_transfer) {
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// Check if buffer is large enough, allocate new buffer if needed
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if (!try_buffer(data_length)) {
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char str[256];
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sprintf(str, GetString(STR_SCSI_BUFFER_ERR), data_length);
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ErrorAlert(str);
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return false;
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}
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// Process S/G table when writing
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if (!reading) {
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D(bug(" writing to buffer\n"));
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uint8 *buffer_ptr = buffer;
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for (int i=0; i<sg_size; i++) {
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uint32 len = sg_len[i];
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D(bug(" %d bytes from %08lx\n", len, sg_ptr[i]));
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memcpy(buffer_ptr, sg_ptr[i], len);
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buffer_ptr += len;
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}
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}
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}
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// Request Sense and autosense data valid?
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BYTE res = 0;
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if (cmd_buffer[0] == 0x03 && scsi.scsi_SenseActual) {
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// Yes, fake command
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D(bug(" autosense\n"));
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memcpy(buffer, sense_buffer, scsi.scsi_SenseActual);
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scsi.scsi_Status = 0;
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do_direct_transfer = false;
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} else {
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// No, send regular command
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D(bug(" sending command, length %ld\n", data_length));
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if (do_direct_transfer) {
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scsi.scsi_Data = (UWORD *)sg_ptr[0];
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scsi.scsi_Length = sg_len[0];
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} else {
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scsi.scsi_Data = (UWORD *)buffer;
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scsi.scsi_Length = data_length;
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}
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scsi.scsi_Actual = 0;
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scsi.scsi_Flags = (reading ? SCSIF_READ : SCSIF_WRITE) | SCSIF_AUTOSENSE;
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scsi.scsi_SenseActual = 0;
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scsi.scsi_Status = 0;
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res = DoIO((struct IORequest *)io);
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D(bug(" command sent, res %d, status %d\n", res, scsi.scsi_Status));
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*stat = scsi.scsi_Status;
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}
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if (!do_direct_transfer) {
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// Process S/G table when reading
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if (reading && res == 0) {
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D(bug(" reading from buffer\n"));
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uint8 *buffer_ptr = buffer;
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for (int i=0; i<sg_size; i++) {
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uint32 len = sg_len[i];
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D(bug(" %d bytes to %08lx\n", len, sg_ptr[i]));
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memcpy(sg_ptr[i], buffer_ptr, len);
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buffer_ptr += len;
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}
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}
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}
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return res == 0;
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}
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