mirror of
https://github.com/kanjitalk755/macemu.git
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272 lines
6.4 KiB
C++
272 lines
6.4 KiB
C++
/*
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* scsi_linux.cpp - SCSI Manager, Linux 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 "sysdeps.h"
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#include <sys/ioctl.h>
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#include <linux/param.h>
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#include <linux/../scsi/sg.h> // workaround for broken RedHat 6.0 /usr/include/scsi
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#include <unistd.h>
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#include <errno.h>
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#define DRIVER_SENSE 0x08
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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 int fds[8]; // fd's for 8 units
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static int fd; // Active fd (selected target)
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static uint32 buffer_size; // Size of data buffer
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static uint8 *buffer = NULL; // Pointer to data buffer
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static uint8 the_cmd[12]; // Active SCSI command
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static int the_cmd_len;
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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;
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// Allocate buffer
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buffer = (uint8 *)malloc(buffer_size = 0x10000);
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// Open generic SCSI driver for all 8 units
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for (id=0; id<8; id++) {
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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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int fd = fds[id] = open(str, O_RDWR | O_EXCL);
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if (fd > 0) {
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// Is it really a Generic SCSI device?
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int timeout = ioctl(fd, SG_GET_TIMEOUT);
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if (timeout < 0) {
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// Error with SG_GET_TIMEOUT, doesn't seem to be a Generic SCSI device
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char msg[256];
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sprintf(msg, GetString(STR_SCSI_DEVICE_NOT_SCSI_WARN), str);
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WarningAlert(msg);
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close(fd);
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fds[id] = -1;
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} else {
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// Flush unwanted garbage from previous use of device
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uint8 reply[256];
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int old_fl = fcntl(fd, F_GETFL);
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fcntl(fd, F_SETFL, old_fl | O_NONBLOCK);
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while (read(fd, reply, sizeof(reply)) != -1 || errno != EAGAIN) ;
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fcntl(fd, F_SETFL, old_fl);
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}
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} else {
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char msg[256];
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sprintf(msg, GetString(STR_SCSI_DEVICE_OPEN_WARN), str, strerror(errno));
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WarningAlert(msg);
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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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}
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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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int fd = fds[i];
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if (fd > 0)
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close(fd);
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}
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// Free buffer
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if (buffer) {
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free(buffer);
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buffer = NULL;
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}
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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(uint32 size)
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{
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size += sizeof(sg_header) + 12;
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if (size <= buffer_size)
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return true;
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uint8 *new_buffer = (uint8 *)malloc(size);
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if (new_buffer == NULL)
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return false;
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free(buffer);
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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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memcpy(the_cmd, cmd, the_cmd_len = 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 fds[id] > 0;
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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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int new_fd = fds[id];
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if (new_fd < 0)
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return false;
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if (new_fd != fd) {
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// New target, clear autosense data
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sg_header *h = (sg_header *)buffer;
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h->driver_status &= ~DRIVER_SENSE;
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}
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fd = new_fd;
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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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static int pack_id = 0;
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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 + sizeof(sg_header) + the_cmd_len;
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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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// Request Sense and autosense data valid?
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sg_header *h = (sg_header *)buffer;
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int res;
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if (reading && the_cmd[0] == 0x03 && (h->target_status & DRIVER_SENSE)) {
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// Yes, fake command
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D(bug(" autosense\n"));
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memcpy(buffer + sizeof(sg_header), h->sense_buffer, 16);
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h->target_status &= ~DRIVER_SENSE;
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res = 0;
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*stat = 0;
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} else {
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// No, send regular command
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if (timeout) {
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int to = timeout * HZ / 60;
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ioctl(fd, SG_SET_TIMEOUT, &to);
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}
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ioctl(fd, SG_NEXT_CMD_LEN, &the_cmd_len);
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D(bug(" sending command, length %d\n", data_length));
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int request_size, reply_size;
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if (reading) {
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h->pack_len = request_size = sizeof(sg_header) + the_cmd_len;
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h->reply_len = reply_size = sizeof(sg_header) + data_length;
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} else {
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h->pack_len = request_size = sizeof(sg_header) + the_cmd_len + data_length;
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h->reply_len = reply_size = sizeof(sg_header);
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}
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h->pack_id = pack_id++;
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h->result = 0;
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h->twelve_byte = (the_cmd_len == 12);
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h->target_status = 0;
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h->host_status = 0;
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h->driver_status = 0;
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h->other_flags = 0;
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memcpy(buffer + sizeof(sg_header), the_cmd, the_cmd_len);
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res = write(fd, buffer, request_size);
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D(bug(" request sent, actual %d, result %d\n", res, h->result));
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if (res >= 0) {
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res = read(fd, buffer, reply_size);
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D(bug(" reply read, actual %d, result %d, status %02x\n", res, h->result, h->target_status << 1));
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}
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*stat = h->target_status << 1;
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}
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// Process S/G table when reading
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if (reading && h->result == 0) {
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D(bug(" reading from buffer\n"));
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uint8 *buffer_ptr = buffer + sizeof(sg_header);
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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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return res >= 0;
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}
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