src/AmigaOS/sys_amiga.cpp

/*
 *  sys_amiga.cpp - System dependent routines, Amiga implementation
 *
 *  Basilisk II (C) 1997-2002 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 <exec/types.h>
#include <exec/memory.h>
#include <devices/newstyle.h>
#include <devices/trackdisk.h>
#include <devices/scsidisk.h>
#include <resources/disk.h>
#include <proto/dos.h>
#include <proto/exec.h>
#include <proto/disk.h>

#include "sysdeps.h"
#include "main.h"
#include "macos_util.h"
#include "prefs.h"
#include "user_strings.h"
#include "sys.h"

#define DEBUG 0
#include "debug.h"


// File handles are pointers to these structures
struct file_handle {
        bool is_file;                   // Flag: plain file or /dev/something?
        bool read_only;                 // Copy of Sys_open() flag
        loff_t start_byte;              // Size of file header (if any)
        loff_t size;                    // Size of file/device (minus header)

        BPTR f;                                 // AmigaDOS file handle (if is_file == true)

        struct IOStdReq *io;    // Pointer to IORequest (if is_file == false)
        ULONG block_size;               // Block size of device (must be a power of two)
        bool is_nsd;                    // New style device?
        bool does_64bit;                // Supports 64 bit trackdisk commands?
        bool is_ejected;                // Volume has been (logically) ejected
        bool is_2060scsi;               // Enable workaround for 2060scsi.device CD-ROM TD_READ bug
};


// FileInfoBlock (must be global because it has to be on a longword boundary)
static struct FileInfoBlock FIB;

// Message port for device communication
static struct MsgPort *the_port = NULL;

// Temporary buffer in chip memory
const int TMP_BUF_SIZE = 0x10000;
static UBYTE *tmp_buf = NULL;


/*
 *  Initialization
 */

void SysInit(void)
{
        // Create port and temporary buffer
        the_port = CreateMsgPort();
        tmp_buf = (UBYTE *)AllocMem(TMP_BUF_SIZE, MEMF_CHIP | MEMF_PUBLIC);
        if (the_port == NULL || tmp_buf == NULL) {
                ErrorAlert(STR_NO_MEM_ERR);
                QuitEmulator();
        }
}


/*
 *  Deinitialization
 */

void SysExit(void)
{
        // Delete port and temporary buffer
        if (the_port) {
                DeleteMsgPort(the_port);
                the_port = NULL;
        }
        if (tmp_buf) {
                FreeMem(tmp_buf, TMP_BUF_SIZE);
                tmp_buf = NULL;
        }
}


/*
 *  This gets called when no "floppy" prefs items are found
 *  It scans for available floppy drives and adds appropriate prefs items
 */

void SysAddFloppyPrefs(void)
{
        for (int i=0; i<4; i++) {
                ULONG id = GetUnitID(i);
                if (id == DRT_150RPM) { // We need an HD drive
                        char str[256];
                        sprintf(str, "/dev/mfm.device/%d/0/0/2880/512", i);
                        PrefsAddString("floppy", str);
                }
        }
}


/*
 *  This gets called when no "disk" prefs items are found
 *  It scans for available HFS volumes and adds appropriate prefs items
 */

void SysAddDiskPrefs(void)
{
        // AmigaOS doesn't support MacOS partitioning, so this probably doesn't make much sense...
}


/*
 *  This gets called when no "cdrom" prefs items are found
 *  It scans for available CD-ROM drives and adds appropriate prefs items
 */

void SysAddCDROMPrefs(void)
{
        // Don't scan for drives if nocdrom option given
        if (PrefsFindBool("nocdrom"))
                return;

        //!!
}


/*
 *  Add default serial prefs (must be added, even if no ports present)
 */

void SysAddSerialPrefs(void)
{
        PrefsAddString("seriala", "serial.device/0");
        PrefsAddString("serialb", "*parallel.device/0");
}


/*
 *  Open file/device, create new file handle (returns NULL on error)
 *
 *  Format for device names: /dev/<name>/<unit>/<open flags>/<start block>/<size (blocks)>/<block size>
 */

void *Sys_open(const char *name, bool read_only)
{
        bool is_file = (strstr(name, "/dev/") != name);

        D(bug("Sys_open(%s, %s)\n", name, read_only ? "read-only" : "read/write"));

        // File or device?
        if (is_file) {

                // File, open it and get stats
                BPTR f = Open((char *)name, MODE_OLDFILE);
                if (!f)
                        return NULL;
                if (!ExamineFH(f, &FIB)) {
                        Close(f);
                        return NULL;
                }

                // Check if file is write protected
                if (FIB.fib_Protection & FIBF_WRITE)
                        read_only = true;

                // Create file_handle
                file_handle *fh = new file_handle;
                fh->f = f;
                fh->is_file = true;
                fh->read_only = read_only;

                // Detect disk image file layout
                loff_t size = FIB.fib_Size;
                Seek(fh->f, 0, OFFSET_BEGINNING);
                Read(fh->f, tmp_buf, 256);
                FileDiskLayout(size, tmp_buf, fh->start_byte, fh->size);
                return fh;

        } else {

                // Device, parse string
                char dev_name[256];
                ULONG dev_unit = 0, dev_flags = 0, dev_start = 0, dev_size = 16, dev_bsize = 512;
                if (sscanf(name, "/dev/%[^/]/%ld/%ld/%ld/%ld/%ld", dev_name, &dev_unit, &dev_flags, &dev_start, &dev_size, &dev_bsize) < 2)
                        return NULL;

                // Create IORequest
                struct IOStdReq *io = (struct IOStdReq *)CreateIORequest(the_port, sizeof(struct IOExtTD));
                if (io == NULL)
                        return NULL;

                // Open device
                if (OpenDevice((UBYTE *)dev_name, dev_unit, (struct IORequest *)io, dev_flags)) {
                        D(bug(" couldn't open device\n"));
                        DeleteIORequest(io);
                        return NULL;
                }

                // Check for new style device
                bool is_nsd = false, does_64bit = false;
                struct NSDeviceQueryResult nsdqr;
                nsdqr.DevQueryFormat = 0;
                nsdqr.SizeAvailable = 0;
                io->io_Command = NSCMD_DEVICEQUERY;
                io->io_Length = sizeof(nsdqr);
                io->io_Data = (APTR)&nsdqr;
                LONG error = DoIO((struct IORequest *)io);
                D(bug("DEVICEQUERY returned %ld (length %ld, actual %ld)\n", error, io->io_Length, io->io_Actual));
                if ((!error) && (io->io_Actual >= 16) && (io->io_Actual <= sizeof(nsdqr)) && (nsdqr.SizeAvailable == io->io_Actual)) {

                        // Looks like an NSD
                        is_nsd = true;
                        D(bug(" new style device, type %ld\n", nsdqr.DeviceType));

                        // We only work with trackdisk-like devices
                        if (nsdqr.DeviceType != NSDEVTYPE_TRACKDISK) {
                                CloseDevice((struct IORequest *)io);
                                DeleteIORequest(io);
                                return NULL;
                        }

                        // Check whether device is 64 bit capable
                        UWORD *cmdcheck;
                        for (cmdcheck = nsdqr.SupportedCommands; *cmdcheck; cmdcheck++) {
                                if (*cmdcheck == NSCMD_TD_READ64) {
                                        D(bug(" supports 64 bit commands\n"));
                                        does_64bit = true;
                                }
                        }
                }

                // Create file_handle
                file_handle *fh = new file_handle;
                fh->io = io;
                fh->is_file = false;
                fh->read_only = read_only;
                fh->start_byte = (loff_t)dev_start * dev_bsize;
                fh->size = (loff_t)dev_size * dev_bsize;
                fh->block_size = dev_bsize;
                fh->is_nsd = is_nsd;
                fh->does_64bit = does_64bit;
                fh->is_ejected = false;
                fh->is_2060scsi = (strcmp(dev_name, "2060scsi.device") == 0);
                return fh;
        }
}


/*
 *  Close file/device, delete file handle
 */

void Sys_close(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

        D(bug("Sys_close(%08lx)\n", arg));

        // File or device?
        if (fh->is_file) {

                // File, simply close it
                Close(fh->f);

        } else {

                // Device, close it and delete IORequest
                fh->io->io_Command = CMD_UPDATE;
                DoIO((struct IORequest *)fh->io);

                fh->io->io_Command = TD_MOTOR;
                fh->io->io_Length = 0;
                DoIO((struct IORequest *)fh->io);

                CloseDevice((struct IORequest *)fh->io);
                DeleteIORequest(fh->io);
        }
        delete fh;
}


/*
 *  Send one I/O request, using 64-bit addressing if the device supports it
 */

static loff_t send_io_request(file_handle *fh, bool writing, ULONG length, loff_t offset, APTR data)
{
        if (fh->does_64bit) {
                fh->io->io_Command = writing ? NSCMD_TD_WRITE64 : NSCMD_TD_READ64;
                fh->io->io_Actual = offset >> 32;
        } else {
                fh->io->io_Command = writing ? CMD_WRITE : CMD_READ;
                fh->io->io_Actual = 0;
        }
        fh->io->io_Length = length;
        fh->io->io_Offset = offset;
        fh->io->io_Data = data;

        if (fh->is_2060scsi && fh->block_size == 2048) {

                // 2060scsi.device has serious problems reading CD-ROMs via TD_READ
                static struct SCSICmd scsi;
                const int SENSE_LENGTH = 256;
                static UBYTE sense_buffer[SENSE_LENGTH];                // Buffer for autosense data
                static UBYTE cmd_buffer[10] = { 0x28, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

                D(bug("send_io_request length=%lu  offset=%lu\n", length, (ULONG) offset));

                memset(sense_buffer, 0, sizeof(sense_buffer));

                scsi.scsi_Command = cmd_buffer;
                scsi.scsi_CmdLength = sizeof(cmd_buffer);
                scsi.scsi_SenseData = sense_buffer;
                scsi.scsi_SenseLength = SENSE_LENGTH;
                scsi.scsi_Flags = SCSIF_AUTOSENSE | (writing ? SCSIF_WRITE : SCSIF_READ);
                scsi.scsi_Data = (UWORD  *) data;
                scsi.scsi_Length = length;

                ULONG block_offset = (ULONG) offset / fh->block_size;
                ULONG block_length = length / fh->block_size;

                cmd_buffer[2] = block_offset >> 24;
                cmd_buffer[3] = block_offset >> 16;
                cmd_buffer[4] = block_offset >> 8;
                cmd_buffer[5] = block_offset & 0xff;

                cmd_buffer[7] = block_length >> 8;
                cmd_buffer[8] = block_length & 0xff;

                fh->io->io_Command = HD_SCSICMD;
                fh->io->io_Actual = 0;
                fh->io->io_Offset = 0;
                fh->io->io_Data = &scsi;
                fh->io->io_Length = sizeof(scsi);

                BYTE result = DoIO((struct IORequest *)fh->io);

                if (result) {
                        D(bug("send_io_request SCSI FAIL result=%lu\n", result));

                        if (result == HFERR_BadStatus) {
                                D(bug("send_io_request SCSI Status=%lu\n", scsi.scsi_Status));
                                if (scsi.scsi_Status == 2) {
                                        D(bug("send_io_request Sense Key=%02lx\n", sense_buffer[2] & 0x0f));
                                        D(bug("send_io_request ASC=%02lx  ASCQ=%02lx\n", sense_buffer[12], sense_buffer[13]));
                                }
                        }
                        return 0;
                }

                D(bug("send_io_request SCSI Actual=%lu\n", scsi.scsi_Actual));

                if (scsi.scsi_Actual != length)
                        return 0;

                return scsi.scsi_Actual;

        } else {

                if (DoIO((struct IORequest *)fh->io) || fh->io->io_Actual != length)
                        return 0;
                return fh->io->io_Actual;
        }
}


/*
 *  Read "length" bytes from file/device, starting at "offset", to "buffer",
 *  returns number of bytes read (or 0)
 */

size_t Sys_read(void *arg, void *buffer, loff_t offset, size_t length)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return 0;

        // File or device?
        if (fh->is_file) {

                // File, seek to position
                if (Seek(fh->f, offset + fh->start_byte, OFFSET_BEGINNING) == -1)
                        return 0;

                // Read data
                LONG actual = Read(fh->f, buffer, length);
                if (actual == -1)
                        return 0;
                else
                        return actual;

        } else {

                // Device, pre-read (partial read of first block) necessary?
                loff_t pos = offset + fh->start_byte;
                size_t actual = 0;
                uint32 pre_offset = pos % fh->block_size;
                if (pre_offset) {

                        // Yes, read one block
                        if (send_io_request(fh, false, fh->block_size, pos - pre_offset, tmp_buf) == 0)
                                return 0;

                        // Copy data to destination buffer
                        size_t pre_length = fh->block_size - pre_offset;
                        if (pre_length > length)
                                pre_length = length;
                        memcpy(buffer, tmp_buf + pre_offset, pre_length);

                        // Adjust data pointers
                        buffer = (uint8 *)buffer + pre_length;
                        pos += pre_length;
                        length -= pre_length;
                        actual += pre_length;
                }

                // Main read (complete reads of middle blocks) possible?
                if (length >= fh->block_size) {

                        // Yes, read blocks
                        size_t main_length = length & ~(fh->block_size - 1);
                        if (send_io_request(fh, false, main_length, pos, buffer) == 0)
                                return 0;

                        // Adjust data pointers
                        buffer = (uint8 *)buffer + main_length;
                        pos += main_length;
                        length -= main_length;
                        actual += main_length;
                }

                // Post-read (partial read of last block) necessary?
                if (length) {

                        // Yes, read one block
                        if (send_io_request(fh, false, fh->block_size, pos, tmp_buf) == 0)
                                return 0;

                        // Copy data to destination buffer
                        memcpy(buffer, tmp_buf, length);
                        actual += length;
                }

                return actual;
        }
}


/*
 *  Write "length" bytes from "buffer" to file/device, starting at "offset",
 *  returns number of bytes written (or 0)
 */

size_t Sys_write(void *arg, void *buffer, loff_t offset, size_t length)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return 0;

        // File or device?
        if (fh->is_file) {

                // File, seek to position if necessary
                if (Seek(fh->f, offset + fh->start_byte, OFFSET_BEGINNING) == -1)
                        return 0;

                // Write data
                LONG actual = Write(fh->f, buffer, length);
                if (actual == -1)
                        return 0;
                else
                        return actual;

        } else {

                // Device, pre-write (partial write of first block) necessary
                loff_t pos = offset + fh->start_byte;
                size_t actual = 0;
                uint32 pre_offset = pos % fh->block_size;
                if (pre_offset) {

                        // Yes, read one block
                        if (send_io_request(fh, false, fh->block_size, pos - pre_offset, tmp_buf) == 0)
                                return 0;

                        // Copy data from source buffer
                        size_t pre_length = fh->block_size - pre_offset;
                        if (pre_length > length)
                                pre_length = length;
                        memcpy(tmp_buf + pre_offset, buffer, pre_length);

                        // Write block back
                        if (send_io_request(fh, true, fh->block_size, pos - pre_offset, tmp_buf) == 0)
                                return 0;

                        // Adjust data pointers
                        buffer = (uint8 *)buffer + pre_length;
                        pos += pre_length;
                        length -= pre_length;
                        actual += pre_length;
                }

                // Main write (complete writes of middle blocks) possible?
                if (length >= fh->block_size) {

                        // Yes, write blocks
                        size_t main_length = length & ~(fh->block_size - 1);
                        if (send_io_request(fh, true, main_length, pos, buffer) == 0)
                                return 0;

                        // Adjust data pointers
                        buffer = (uint8 *)buffer + main_length;
                        pos += main_length;
                        length -= main_length;
                        actual += main_length;
                }

                // Post-write (partial write of last block) necessary?
                if (length) {

                        // Yes, read one block
                        if (send_io_request(fh, false, fh->block_size, pos, tmp_buf) == 0)
                                return 0;

                        // Copy data from source buffer
                        memcpy(buffer, tmp_buf, length);

                        // Write block back
                        if (send_io_request(fh, true, fh->block_size, pos, tmp_buf) == 0)
                                return 0;
                        actual += length;
                }

                return actual;
        }
}


/*
 *  Return size of file/device (minus header)
 */

loff_t SysGetFileSize(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return true;

        return fh->size;
}


/*
 *  Eject volume (if applicable)
 */

void SysEject(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

        if (!fh->is_file) {

                // Flush buffer, turn off the drive motor and eject volume
                fh->io->io_Command = CMD_UPDATE;
                DoIO((struct IORequest *)fh->io);

                fh->io->io_Command = TD_MOTOR;
                fh->io->io_Length = 0;
                DoIO((struct IORequest *)fh->io);

                fh->io->io_Command = TD_EJECT;
                fh->io->io_Length = 1;
                DoIO((struct IORequest *)fh->io);

                fh->is_ejected = true;
        }
}


/*
 *  Format volume (if applicable)
 */

bool SysFormat(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        //!!
        return true;
}


/*
 *  Check if file/device is read-only (this includes the read-only flag on Sys_open())
 */

bool SysIsReadOnly(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return true;

        if (fh->is_file) {

                // File, return flag given to Sys_open
                return fh->read_only;

        } else {

                // Device, check write protection
                fh->io->io_Command = TD_PROTSTATUS;
                DoIO((struct IORequest *)fh->io);
                if (fh->io->io_Actual)
                        return true;
                else
                        return fh->read_only;
        }
}


/*
 *  Check if the given file handle refers to a fixed or a removable disk
 */

bool SysIsFixedDisk(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return true;

        return true;
}


/*
 *  Check if a disk is inserted in the drive (always true for files)
 */

bool SysIsDiskInserted(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_file)
                return true;
        else {

                // Check medium status
                fh->io->io_Command = TD_CHANGESTATE;
                fh->io->io_Actual = 0;
                DoIO((struct IORequest *)fh->io);
                bool inserted = (fh->io->io_Actual == 0);

                if (!inserted) {
                        // Disk was ejected and has now been taken out
                        fh->is_ejected = false;
                }

                if (fh->is_ejected) {
                        // Disk was ejected but has not yet been taken out, report it as
                        // no longer in the drive
                        return false;
                } else
                        return inserted;
        }
}


/*
 *  Prevent medium removal (if applicable)
 */

void SysPreventRemoval(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

        if (!fh->is_file) {

                // Send PREVENT ALLOW MEDIUM REMOVAL SCSI command
                struct SCSICmd scsi;
                static const UBYTE the_cmd[6] = {0x1e, 0, 0, 0, 1, 0};
                scsi.scsi_Length = 0;
                scsi.scsi_Command = (UBYTE *)the_cmd;
                scsi.scsi_CmdLength = 6;
                scsi.scsi_Flags = SCSIF_READ;
                scsi.scsi_Status = 0;
                fh->io->io_Data = &scsi;
                fh->io->io_Length = sizeof(scsi);
                fh->io->io_Command = HD_SCSICMD;
                DoIO((struct IORequest *)fh->io);
        }
}


/*
 *  Allow medium removal (if applicable)
 */

void SysAllowRemoval(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

        if (!fh->is_file) {

                // Send PREVENT ALLOW MEDIUM REMOVAL SCSI command
                struct SCSICmd scsi;
                static const UBYTE the_cmd[6] = {0x1e, 0, 0, 0, 0, 0};
                scsi.scsi_Length = 0;
                scsi.scsi_Command = (UBYTE *)the_cmd;
                scsi.scsi_CmdLength = 6;
                scsi.scsi_Flags = SCSIF_READ;
                scsi.scsi_Status = 0;
                fh->io->io_Data = &scsi;
                fh->io->io_Length = sizeof(scsi);
                fh->io->io_Command = HD_SCSICMD;
                DoIO((struct IORequest *)fh->io);
        }
}


/*
 *  Read CD-ROM TOC (binary MSF format, 804 bytes max.)
 */

bool SysCDReadTOC(void *arg, uint8 *toc)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_file)
                return false;
        else {

                // Send READ TOC MSF SCSI command
                struct SCSICmd scsi;
                static const UBYTE read_toc_cmd[10] = {0x43, 0x02, 0, 0, 0, 0, 0, 0x03, 0x24, 0};
                scsi.scsi_Data = (UWORD *)tmp_buf;
                scsi.scsi_Length = 804;
                scsi.scsi_Command = (UBYTE *)read_toc_cmd;
                scsi.scsi_CmdLength = 10;
                scsi.scsi_Flags = SCSIF_READ;
                scsi.scsi_Status = 0;
                fh->io->io_Data = &scsi;
                fh->io->io_Length = sizeof(scsi);
                fh->io->io_Command = HD_SCSICMD;
                if (DoIO((struct IORequest *)fh->io) || scsi.scsi_Status)
                        return false;
                memcpy(toc, tmp_buf, 804);
                return true;
        }
}


/*
 *  Read CD-ROM position data (Sub-Q Channel, 16 bytes, see SCSI standard)
 */

bool SysCDGetPosition(void *arg, uint8 *pos)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_file)
                return false;
        else {

                // Send READ SUB-CHANNEL SCSI command
                struct SCSICmd scsi;
                static const UBYTE read_subq_cmd[10] = {0x42, 0x02, 0x40, 0x01, 0, 0, 0, 0, 0x10, 0};
                scsi.scsi_Data = (UWORD *)tmp_buf;
                scsi.scsi_Length = 16;
                scsi.scsi_Command = (UBYTE *)read_subq_cmd;
                scsi.scsi_CmdLength = 10;
                scsi.scsi_Flags = SCSIF_READ;
                scsi.scsi_Status = 0;
                fh->io->io_Data = &scsi;
                fh->io->io_Length = sizeof(scsi);
                fh->io->io_Command = HD_SCSICMD;
                if (DoIO((struct IORequest *)fh->io) || scsi.scsi_Status)
                        return false;
                memcpy(pos, tmp_buf, 16);
                return true;
        }
}


/*
 *  Play CD audio
 */

bool SysCDPlay(void *arg, uint8 start_m, uint8 start_s, uint8 start_f, uint8 end_m, uint8 end_s, uint8 end_f)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_file)
                return false;
        else {

                // Send PLAY AUDIO MSF SCSI command
                struct SCSICmd scsi;
                UBYTE play_cmd[10] = {0x47, 0, 0, start_m, start_s, start_f, end_m, end_s, end_f, 0};
                scsi.scsi_Data = (UWORD *)tmp_buf;
                scsi.scsi_Length = 0;
                scsi.scsi_Command = play_cmd;
                scsi.scsi_CmdLength = 10;
                scsi.scsi_Flags = SCSIF_READ;
                scsi.scsi_Status = 0;
                fh->io->io_Data = &scsi;
                fh->io->io_Length = sizeof(scsi);
                fh->io->io_Command = HD_SCSICMD;
                if (DoIO((struct IORequest *)fh->io) || scsi.scsi_Status)
                        return false;
                return true;
        }
}


/*
 *  Pause CD audio
 */

bool SysCDPause(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_file)
                return false;
        else {

                // Send PAUSE RESUME SCSI command
                struct SCSICmd scsi;
                static const UBYTE pause_cmd[10] = {0x4b, 0, 0, 0, 0, 0, 0, 0, 0, 0};
                scsi.scsi_Data = (UWORD *)tmp_buf;
                scsi.scsi_Length = 0;
                scsi.scsi_Command = (UBYTE *)pause_cmd;
                scsi.scsi_CmdLength = 10;
                scsi.scsi_Flags = SCSIF_READ;
                scsi.scsi_Status = 0;
                fh->io->io_Data = &scsi;
                fh->io->io_Length = sizeof(scsi);
                fh->io->io_Command = HD_SCSICMD;
                if (DoIO((struct IORequest *)fh->io) || scsi.scsi_Status)
                        return false;
                return true;
        }
}


/*
 *  Resume paused CD audio
 */

bool SysCDResume(void *arg)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_file)
                return false;
        else {

                // Send PAUSE RESUME SCSI command
                struct SCSICmd scsi;
                static const UBYTE resume_cmd[10] = {0x4b, 0, 0, 0, 0, 0, 0, 0, 1, 0};
                scsi.scsi_Data = (UWORD *)tmp_buf;
                scsi.scsi_Length = 0;
                scsi.scsi_Command = (UBYTE *)resume_cmd;
                scsi.scsi_CmdLength = 10;
                scsi.scsi_Flags = SCSIF_READ;
                scsi.scsi_Status = 0;
                fh->io->io_Data = &scsi;
                fh->io->io_Length = sizeof(scsi);
                fh->io->io_Command = HD_SCSICMD;
                if (DoIO((struct IORequest *)fh->io) || scsi.scsi_Status)
                        return false;
                return true;
        }
}


/*
 *  Stop CD audio
 */

bool SysCDStop(void *arg, uint8 lead_out_m, uint8 lead_out_s, uint8 lead_out_f)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        if (fh->is_file)
                return false;
        else {

                uint8 end_m = lead_out_m;
                uint8 end_s = lead_out_s;
                uint8 end_f = lead_out_f + 1;
                if (end_f >= 75) {
                        end_f = 0;
                        end_s++;
                        if (end_s >= 60) {
                                end_s = 0;
                                end_m++;
                        }
                }

                // Send PLAY AUDIO MSF SCSI command (play first frame of lead-out area)
                struct SCSICmd scsi;
                UBYTE play_cmd[10] = {0x47, 0, 0, lead_out_m, lead_out_s, lead_out_f, end_m, end_s, end_f, 0};
                scsi.scsi_Data = (UWORD *)tmp_buf;
                scsi.scsi_Length = 0;
                scsi.scsi_Command = play_cmd;
                scsi.scsi_CmdLength = 10;
                scsi.scsi_Flags = SCSIF_READ;
                scsi.scsi_Status = 0;
                fh->io->io_Data = &scsi;
                fh->io->io_Length = sizeof(scsi);
                fh->io->io_Command = HD_SCSICMD;
                if (DoIO((struct IORequest *)fh->io) || scsi.scsi_Status)
                        return false;
                return true;
        }
}


/*
 *  Perform CD audio fast-forward/fast-reverse operation starting from specified address
 */

bool SysCDScan(void *arg, uint8 start_m, uint8 start_s, uint8 start_f, bool reverse)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return false;

        //!!
        return false;
}


/*
 *  Set CD audio volume (0..255 each channel)
 */

void SysCDSetVolume(void *arg, uint8 left, uint8 right)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

        if (!fh->is_file) {

                // Send MODE SENSE (CD-ROM Audio Control Parameters Page) SCSI command
                struct SCSICmd scsi;
                static const UBYTE mode_sense_cmd[6] = {0x1a, 0x08, 0x0e, 0, 20, 0};
                scsi.scsi_Data = (UWORD *)tmp_buf;
                scsi.scsi_Length = 20;
                scsi.scsi_Command = (UBYTE *)mode_sense_cmd;
                scsi.scsi_CmdLength = 6;
                scsi.scsi_Flags = SCSIF_READ;
                scsi.scsi_Status = 0;
                fh->io->io_Data = &scsi;
                fh->io->io_Length = sizeof(scsi);
                fh->io->io_Command = HD_SCSICMD;
                if (DoIO((struct IORequest *)fh->io) || scsi.scsi_Status)
                        return;

                tmp_buf[6] = 0x04;              // Immed
                tmp_buf[9] = 0;                 // LBA/sec format
                tmp_buf[10] = 0;                // LBA/sec
                tmp_buf[11] = 0;
                tmp_buf[13] = left;             // Port 0 volume
                tmp_buf[15] = right;    // Port 1 volume

                // Send MODE SELECT (CD-ROM Audio Control Parameters Page) SCSI command
                static const UBYTE mode_select_cmd[6] = {0x15, 0x10, 0, 0, 20, 0};
                scsi.scsi_Data = (UWORD *)tmp_buf;
                scsi.scsi_Length = 20;
                scsi.scsi_Command = (UBYTE *)mode_select_cmd;
                scsi.scsi_CmdLength = 6;
                scsi.scsi_Flags = SCSIF_WRITE;
                scsi.scsi_Status = 0;
                fh->io->io_Data = &scsi;
                fh->io->io_Length = sizeof(scsi);
                fh->io->io_Command = HD_SCSICMD;
                DoIO((struct IORequest *)fh->io);
        }
}


/*
 *  Get CD audio volume (0..255 each channel)
 */

void SysCDGetVolume(void *arg, uint8 &left, uint8 &right)
{
        file_handle *fh = (file_handle *)arg;
        if (!fh)
                return;

        if (!fh->is_file) {

                // Send MODE SENSE (CD-ROM Audio Control Parameters Page) SCSI command
                struct SCSICmd scsi;
                static const UBYTE mode_sense_cmd[6] = {0x1a, 0x08, 0x0e, 0, 20, 0};
                scsi.scsi_Data = (UWORD *)tmp_buf;
                scsi.scsi_Length = 20;
                scsi.scsi_Command = (UBYTE *)mode_sense_cmd;
                scsi.scsi_CmdLength = 6;
                scsi.scsi_Flags = SCSIF_READ;
                scsi.scsi_Status = 0;
                fh->io->io_Data = &scsi;
                fh->io->io_Length = sizeof(scsi);
                fh->io->io_Command = HD_SCSICMD;
                if (DoIO((struct IORequest *)fh->io) || scsi.scsi_Status)
                        return;
                left = tmp_buf[13];             // Port 0 volume
                right = tmp_buf[15];    // Port 1 volume
        }
}
Revision:	1.7
Committed:	2002-01-15T14:58:34Z (22 years, 10 months ago) by cebix
Branch:	MAIN
CVS Tags:	snapshot-15012002
Changes since 1.6:	+1 -1 lines
Log Message:	- documentation updates - 2001 -> 2002 - version 0.9 -> 1.0