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- /*
- * scsi_linux.cpp - SCSI Manager, Linux specific stuff
- *
- * Basilisk II (C) 1997-2001 Christian Bauer
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
- #include "sysdeps.h"
-
- #include <sys/ioctl.h>
- #include <linux/param.h>
- #include <linux/../scsi/sg.h> // workaround for broken RedHat 6.0 /usr/include/scsi
- #include <unistd.h>
- #include <errno.h>
-
- #include "main.h"
- #include "prefs.h"
- #include "user_strings.h"
- #include "scsi.h"
-
- #define DEBUG 0
- #include "debug.h"
-
-
- // Global variables
- static int fds[8]; // fd's for 8 units
- static int fd; // Active fd (selected target)
-
- static uint32 buffer_size; // Size of data buffer
- static uint8 *buffer = NULL; // Pointer to data buffer
-
- static uint8 the_cmd[12]; // Active SCSI command
- static int the_cmd_len;
-
-
- /*
- * Initialization
- */
-
- void SCSIInit(void)
- {
- int id;
-
- // Allocate buffer
- buffer = (uint8 *)malloc(buffer_size = 0x10000);
-
- // Open generic SCSI driver for all 8 units
- for (id=0; id<8; id++) {
- char prefs_name[16];
- sprintf(prefs_name, "scsi%d", id);
- const char *str = PrefsFindString(prefs_name);
- if (str) {
- int fd = fds[id] = open(str, O_RDWR);
- if (fd > 0) {
- // Is it really a Generic SCSI device?
- int timeout = ioctl(fd, SG_GET_TIMEOUT);
- if (timeout < 0) {
- // Error with SG_GET_TIMEOUT, doesn't seem to be a Generic SCSI device
- char msg[256];
- sprintf(msg, GetString(STR_SCSI_DEVICE_NOT_SCSI_WARN), str);
- WarningAlert(msg);
- close(fd);
- fds[id] = -1;
- } else {
- // Flush unwanted garbage from previous use of device
- uint8 reply[256];
- int old_fl = fcntl(fd, F_GETFL);
- fcntl(fd, F_SETFL, old_fl | O_NONBLOCK);
- while (read(fd, reply, sizeof(reply)) != -1 || errno != EAGAIN) ;
- fcntl(fd, F_SETFL, old_fl);
- }
- } else {
- char msg[256];
- sprintf(msg, GetString(STR_SCSI_DEVICE_OPEN_WARN), str, strerror(errno));
- WarningAlert(msg);
- }
- }
- }
-
- // Reset SCSI bus
- SCSIReset();
- }
-
-
- /*
- * Deinitialization
- */
-
- void SCSIExit(void)
- {
- // Close all devices
- for (int i=0; i<8; i++) {
- int fd = fds[i];
- if (fd > 0)
- close(fd);
- }
-
- // Free buffer
- if (buffer) {
- free(buffer);
- buffer = NULL;
- }
- }
-
-
- /*
- * Check if requested data size fits into buffer, allocate new buffer if needed
- */
-
- static bool try_buffer(uint32 size)
- {
- size += sizeof(struct sg_header) + 12;
- if (size <= buffer_size)
- return true;
-
- uint8 *new_buffer = (uint8 *)malloc(size);
- if (new_buffer == NULL)
- return false;
- free(buffer);
- buffer = new_buffer;
- buffer_size = size;
- return true;
- }
-
-
- /*
- * Set SCSI command to be sent by scsi_send_cmd()
- */
-
- void scsi_set_cmd(int cmd_length, uint8 *cmd)
- {
- memcpy(the_cmd, cmd, the_cmd_len = cmd_length);
- }
-
-
- /*
- * Check for presence of SCSI target
- */
-
- bool scsi_is_target_present(int id)
- {
- return fds[id] > 0;
- }
-
-
- /*
- * Set SCSI target (returns false on error)
- */
-
- bool scsi_set_target(int id, int lun)
- {
- int new_fd = fds[id];
- if (new_fd < 0)
- return false;
- if (new_fd != fd) {
- // Clear autosense data
- struct sg_header *h = (struct sg_header *)buffer;
- h->sense_buffer[2] = 0;
- }
- fd = new_fd;
- return true;
- }
-
-
- /*
- * Send SCSI command to active target (scsi_set_command() must have been called),
- * read/write data according to S/G table (returns false on error); timeout is in 1/60 sec
- */
-
- bool scsi_send_cmd(size_t data_length, bool reading, int sg_size, uint8 **sg_ptr, uint32 *sg_len, uint16 *stat, uint32 timeout)
- {
- static int pack_id = 0;
-
- // Check if buffer is large enough, allocate new buffer if needed
- if (!try_buffer(data_length)) {
- char str[256];
- sprintf(str, GetString(STR_SCSI_BUFFER_ERR), data_length);
- ErrorAlert(str);
- return false;
- }
-
- // Process S/G table when writing
- if (!reading) {
- D(bug(" writing to buffer\n"));
- uint8 *buffer_ptr = buffer + sizeof(struct sg_header) + the_cmd_len;
- for (int i=0; i<sg_size; i++) {
- uint32 len = sg_len[i];
- D(bug(" %d bytes from %08lx\n", len, sg_ptr[i]));
- memcpy(buffer_ptr, sg_ptr[i], len);
- buffer_ptr += len;
- }
- }
-
- // Request Sense and autosense data valid?
- struct sg_header *h = (struct sg_header *)buffer;
- int res;
- if (the_cmd[0] == 0x03 && (h->sense_buffer[2] & 0x0f)) {
-
- // Yes, fake command
- D(bug(" autosense\n"));
- memcpy(buffer + sizeof(struct sg_header), h->sense_buffer, 16);
- res = 0;
- *stat = 0;
-
- } else {
-
- // No, send regular command
- int to = timeout * HZ / 60;
- ioctl(fd, SG_SET_TIMEOUT, &to);
- D(bug(" sending command, length %d\n", data_length));
- int request_size, reply_size;
- if (reading) {
- h->pack_len = request_size = sizeof(struct sg_header) + the_cmd_len;
- h->reply_len = reply_size = sizeof(struct sg_header) + data_length;
- } else {
- h->pack_len = request_size = sizeof(struct sg_header) + the_cmd_len + data_length;
- h->reply_len = reply_size = sizeof(struct sg_header);
- }
- h->pack_id = pack_id++;
- h->result = 0;
- h->twelve_byte = (the_cmd_len == 12);
- h->sense_buffer[2] = 0;
- memcpy(buffer + sizeof(struct sg_header), the_cmd, the_cmd_len);
- res = write(fd, buffer, request_size);
- D(bug(" request sent, actual %d, result %d\n", res, h->result));
- if (res >= 0) {
- res = read(fd, buffer, reply_size);
- D(bug(" reply read, actual %d, result %d\n", res, h->result));
- }
- if (h->sense_buffer[2] & 0x0f)
- *stat = 2; // Check condition
- else
- *stat = 0; // No error
- }
-
- // Process S/G table when reading
- if (reading && h->result == 0) {
- D(bug(" reading from buffer\n"));
- uint8 *buffer_ptr = buffer + sizeof(struct sg_header);
- for (int i=0; i<sg_size; i++) {
- uint32 len = sg_len[i];
- D(bug(" %d bytes to %08lx\n", len, sg_ptr[i]));
- memcpy(sg_ptr[i], buffer_ptr, len);
- buffer_ptr += len;
- }
- }
- return res >= 0;
- }
-