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sim_disk.c
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/* sim_disk.c: simulator disk support library
Copyright (c) 2011, Mark Pizzolato
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the names of Mark Pizzolato shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Mark Pizzolato.
This is the place which hides processing of various disk formats,
as well as OS-specific direct hardware access.
25-Jan-11 MP Initial Implemementation
Public routines:
sim_disk_attach attach disk unit
sim_disk_attach_ex attach disk unit extended parameters
sim_disk_detach detach disk unit
sim_disk_attach_help help routine for attaching disks
sim_disk_rdsect read disk sectors
sim_disk_rdsect_a read disk sectors asynchronously
sim_disk_wrsect write disk sectors
sim_disk_wrsect_a write disk sectors asynchronously
sim_disk_unload unload or detach a disk as needed
sim_disk_reset reset unit
sim_disk_wrp TRUE if write protected
sim_disk_isavailable TRUE if available for I/O
sim_disk_size get disk size
sim_disk_set_fmt set disk format
sim_disk_show_fmt show disk format
sim_disk_set_capac set disk capacity
sim_disk_show_capac show disk capacity
sim_disk_set_async enable asynchronous operation
sim_disk_clr_async disable asynchronous operation
sim_disk_data_trace debug support
sim_disk_test unit test routine
Internal routines:
sim_os_disk_open_raw platform specific open raw device
sim_os_disk_close_raw platform specific close raw device
sim_os_disk_size_raw platform specific raw device size
sim_os_disk_unload_raw platform specific disk unload/eject
sim_os_disk_rdsect platform specific read sectors
sim_os_disk_wrsect platform specific write sectors
sim_vhd_disk_open platform independent open virtual disk file
sim_vhd_disk_create platform independent create virtual disk file
sim_vhd_disk_create_diff platform independent create differencing virtual disk file
sim_vhd_disk_close platform independent close virtual disk file
sim_vhd_disk_size platform independent virtual disk size
sim_vhd_disk_rdsect platform independent read virtual disk sectors
sim_vhd_disk_wrsect platform independent write virtual disk sectors
*/
#define _FILE_OFFSET_BITS 64 /* 64 bit file offset for raw I/O operations */
#include "sim_defs.h"
#include "sim_disk.h"
#include "sim_ether.h"
#include <ctype.h>
#include <sys/stat.h>
#if defined SIM_ASYNCH_IO
#include <pthread.h>
#endif
/* Newly created SIMH (and possibly RAW) disk containers */
/* will have this data as the last 512 bytes of the container */
/* It will not be considered part of the data in the container */
/* Previously existing containers will have this appended to */
/* the end of the container if they are opened for write */
struct simh_disk_footer {
uint8 Signature[4]; /* must be 'simh' */
uint8 CreatingSimulator[64]; /* name of simulator */
uint8 DriveType[16];
uint32 SectorSize;
uint32 SectorCount;
uint32 TransferElementSize;
uint8 CreationTime[28]; /* Result of ctime() */
uint8 FooterVersion; /* Initially 0 */
uint8 AccessFormat; /* 1 - SIMH, 2 - RAW */
uint8 Reserved[382]; /* Currently unused */
uint32 Checksum; /* CRC32 of the prior 508 bytes */
};
/* OS Independent Disk Virtual Disk (VHD) I/O support */
#if (defined (VMS) && !(defined (__ALPHA) || defined (__ia64)))
#define DONT_DO_VHD_SUPPORT /* VAX/VMS compilers don't have 64 bit integers */
#endif
#if defined(_WIN32) || defined (__ALPHA) || defined (__ia64) || defined (VMS)
#ifndef __BYTE_ORDER__
#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
#endif
#endif
#ifndef __BYTE_ORDER__
#define __BYTE_ORDER__ UNKNOWN
#endif
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
static uint32
NtoHl(uint32 value)
{
uint8 *l = (uint8 *)&value;
return (uint32)l[3] | ((uint32)l[2]<<8) | ((uint32)l[1]<<16) | ((uint32)l[0]<<24);
}
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
static uint32
NtoHl(uint32 value)
{
return value;
}
#else
static uint32
NtoHl(uint32 value)
{
uint8 *l = (uint8 *)&value;
if (sim_end)
return l[3] | (l[2]<<8) | (l[1]<<16) | (l[0]<<24);
return value;
}
#endif
struct disk_context {
t_offset container_size; /* Size of the data portion (of the pseudo disk) */
DEVICE *dptr; /* Device for unit (access to debug flags) */
uint32 dbit; /* debugging bit */
uint32 sector_size; /* Disk Sector Size (of the pseudo disk) */
uint32 capac_factor; /* Units of Capacity (8 = quadword, 2 = word, 1 = byte) */
uint32 xfer_element_size; /* Disk Bus Transfer size (1 - byte, 2 - word, 4 - longword) */
uint32 storage_sector_size;/* Sector size of the containing storage */
uint32 removable; /* Removable device flag */
uint32 is_cdrom; /* Host system CDROM Device */
uint32 media_removed; /* Media not available flag */
uint32 auto_format; /* Format determined dynamically */
struct simh_disk_footer
*footer;
#if defined _WIN32
HANDLE disk_handle; /* OS specific Raw device handle */
#endif
#if defined SIM_ASYNCH_IO
int asynch_io; /* Asynchronous Interrupt scheduling enabled */
int asynch_io_latency; /* instructions to delay pending interrupt */
pthread_mutex_t lock;
pthread_t io_thread; /* I/O Thread Id */
pthread_mutex_t io_lock;
pthread_cond_t io_cond;
pthread_cond_t io_done;
pthread_cond_t startup_cond;
int io_dop;
uint8 *buf;
t_seccnt *rsects;
t_seccnt sects;
t_lba lba;
DISK_PCALLBACK callback;
t_stat io_status;
#endif
};
#define disk_ctx up8 /* Field in Unit structure which points to the disk_context */
#if defined SIM_ASYNCH_IO
#define AIO_CALLSETUP \
struct disk_context *ctx = (struct disk_context *)uptr->disk_ctx; \
\
if ((!callback) || !ctx->asynch_io)
#define AIO_CALL(op, _lba, _buf, _rsects, _sects, _callback) \
if (ctx->asynch_io) { \
struct disk_context *ctx = \
(struct disk_context *)uptr->disk_ctx; \
\
pthread_mutex_lock (&ctx->io_lock); \
\
sim_debug_unit (ctx->dbit, uptr, \
"sim_disk AIO_CALL(op=%d, unit=%d, lba=0x%X, sects=%d)\n",\
op, (int)(uptr - ctx->dptr->units), _lba, _sects);\
\
if (ctx->callback) \
abort(); /* horrible mistake, stop */ \
ctx->io_dop = op; \
ctx->lba = _lba; \
ctx->buf = _buf; \
ctx->sects = _sects; \
ctx->rsects = _rsects; \
ctx->callback = _callback; \
pthread_cond_signal (&ctx->io_cond); \
pthread_mutex_unlock (&ctx->io_lock); \
} \
else \
if (_callback) \
(_callback) (uptr, r);
#define DOP_DONE 0 /* close */
#define DOP_RSEC 1 /* sim_disk_rdsect_a */
#define DOP_WSEC 2 /* sim_disk_wrsect_a */
#define DOP_IAVL 3 /* sim_disk_isavailable_a */
static void *
_disk_io(void *arg)
{
UNIT* volatile uptr = (UNIT*)arg;
struct disk_context *ctx = (struct disk_context *)uptr->disk_ctx;
/* Boost Priority for this I/O thread vs the CPU instruction execution
thread which in general won't be readily yielding the processor when
this thread needs to run */
sim_os_set_thread_priority (PRIORITY_ABOVE_NORMAL);
sim_debug_unit (ctx->dbit, uptr, "_disk_io(unit=%d) starting\n", (int)(uptr - ctx->dptr->units));
pthread_mutex_lock (&ctx->io_lock);
pthread_cond_signal (&ctx->startup_cond); /* Signal we're ready to go */
while (ctx->asynch_io) {
pthread_cond_wait (&ctx->io_cond, &ctx->io_lock);
if (ctx->io_dop == DOP_DONE)
break;
pthread_mutex_unlock (&ctx->io_lock);
switch (ctx->io_dop) {
case DOP_RSEC:
ctx->io_status = sim_disk_rdsect (uptr, ctx->lba, ctx->buf, ctx->rsects, ctx->sects);
break;
case DOP_WSEC:
ctx->io_status = sim_disk_wrsect (uptr, ctx->lba, ctx->buf, ctx->rsects, ctx->sects);
break;
case DOP_IAVL:
ctx->io_status = sim_disk_isavailable (uptr);
break;
}
pthread_mutex_lock (&ctx->io_lock);
ctx->io_dop = DOP_DONE;
pthread_cond_signal (&ctx->io_done);
sim_activate (uptr, ctx->asynch_io_latency);
}
pthread_mutex_unlock (&ctx->io_lock);
sim_debug_unit (ctx->dbit, uptr, "_disk_io(unit=%d) exiting\n", (int)(uptr - ctx->dptr->units));
return NULL;
}
/* This routine is called in the context of the main simulator thread before
processing events for any unit. It is only called when an asynchronous
thread has called sim_activate() to activate a unit. The job of this
routine is to put the unit in proper condition to digest what may have
occurred in the asynchrconous thread.
Since disk processing only handles a single I/O at a time to a
particular disk device (due to using stdio for the SimH Disk format
and stdio doesn't have an atomic seek+(read|write) operation),
we have the opportunity to possibly detect improper attempts to
issue multiple concurrent I/O requests. */
static void _disk_completion_dispatch (UNIT *uptr)
{
struct disk_context *ctx = (struct disk_context *)uptr->disk_ctx;
DISK_PCALLBACK callback = ctx->callback;
sim_debug_unit (ctx->dbit, uptr, "_disk_completion_dispatch(unit=%d, dop=%d, callback=%p)\n", (int)(uptr - ctx->dptr->units), ctx->io_dop, (void *)(ctx->callback));
if (ctx->io_dop != DOP_DONE)
abort(); /* horribly wrong, stop */
if (ctx->callback && ctx->io_dop == DOP_DONE) {
ctx->callback = NULL;
callback (uptr, ctx->io_status);
}
}
static t_bool _disk_is_active (UNIT *uptr)
{
struct disk_context *ctx = (struct disk_context *)uptr->disk_ctx;
if (ctx) {
sim_debug_unit (ctx->dbit, uptr, "_disk_is_active(unit=%d, dop=%d)\n", (int)(uptr - ctx->dptr->units), ctx->io_dop);
return (ctx->io_dop != DOP_DONE);
}
return FALSE;
}
static t_bool _disk_cancel (UNIT *uptr)
{
struct disk_context *ctx = (struct disk_context *)uptr->disk_ctx;
if (ctx) {
sim_debug_unit (ctx->dbit, uptr, "_disk_cancel(unit=%d, dop=%d)\n", (int)(uptr - ctx->dptr->units), ctx->io_dop);
if (ctx->asynch_io) {
pthread_mutex_lock (&ctx->io_lock);
while (ctx->io_dop != DOP_DONE)
pthread_cond_wait (&ctx->io_done, &ctx->io_lock);
pthread_mutex_unlock (&ctx->io_lock);
}
}
return FALSE;
}
#else
#define AIO_CALLSETUP
#define AIO_CALL(op, _lba, _buf, _rsects, _sects, _callback) \
if (_callback) \
(_callback) (uptr, r);
#endif
/* Forward declarations */
static t_stat sim_vhd_disk_implemented (void);
static FILE *sim_vhd_disk_open (const char *rawdevicename, const char *openmode);
static FILE *sim_vhd_disk_create (const char *szVHDPath, t_offset desiredsize);
static FILE *sim_vhd_disk_create_diff (const char *szVHDPath, const char *szParentVHDPath);
static FILE *sim_vhd_disk_merge (const char *szVHDPath, char **ParentVHD);
static int sim_vhd_disk_close (FILE *f);
static void sim_vhd_disk_flush (FILE *f);
static t_offset sim_vhd_disk_size (FILE *f);
static t_stat sim_vhd_disk_rdsect (UNIT *uptr, t_lba lba, uint8 *buf, t_seccnt *sectsread, t_seccnt sects);
static t_stat sim_vhd_disk_wrsect (UNIT *uptr, t_lba lba, uint8 *buf, t_seccnt *sectswritten, t_seccnt sects);
static t_stat sim_vhd_disk_clearerr (UNIT *uptr);
static t_stat sim_vhd_disk_set_dtype (FILE *f, const char *dtype, uint32 SectorSize, uint32 xfer_element_size);
static const char *sim_vhd_disk_get_dtype (FILE *f, uint32 *SectorSize, uint32 *xfer_element_size, char sim_name[64], time_t *creation_time);
static t_stat sim_os_disk_implemented_raw (void);
static FILE *sim_os_disk_open_raw (const char *rawdevicename, const char *openmode);
static int sim_os_disk_close_raw (FILE *f);
static void sim_os_disk_flush_raw (FILE *f);
static t_offset sim_os_disk_size_raw (FILE *f);
static t_stat sim_os_disk_unload_raw (FILE *f);
static t_bool sim_os_disk_isavailable_raw (FILE *f);
static t_stat sim_os_disk_rdsect (UNIT *uptr, t_lba lba, uint8 *buf, t_seccnt *sectsread, t_seccnt sects);
static t_stat sim_os_disk_read (UNIT *uptr, t_offset addr, uint8 *buf, uint32 *bytesread, uint32 bytes);
static t_stat sim_os_disk_wrsect (UNIT *uptr, t_lba lba, uint8 *buf, t_seccnt *sectswritten, t_seccnt sects);
static t_stat sim_os_disk_write (UNIT *uptr, t_offset addr, uint8 *buf, uint32 *byteswritten, uint32 bytes);
static t_stat sim_os_disk_info_raw (FILE *f, uint32 *sector_size, uint32 *removable, uint32 *is_cdrom);
static char *HostPathToVhdPath (const char *szHostPath, char *szVhdPath, size_t VhdPathSize);
static char *VhdPathToHostPath (const char *szVhdPath, char *szHostPath, size_t HostPathSize);
static t_offset get_filesystem_size (UNIT *uptr);
struct sim_disk_fmt {
const char *name; /* name */
int32 uflags; /* unit flags */
int32 fmtval; /* Format type value */
t_stat (*impl_fnc)(void); /* Implemented Test Function */
};
static struct sim_disk_fmt fmts[] = {
{ "AUTO detect", 0, DKUF_F_AUTO, NULL},
{ "SIMH", 0, DKUF_F_STD, NULL},
{ "RAW", 0, DKUF_F_RAW, sim_os_disk_implemented_raw},
{ "VHD", 0, DKUF_F_VHD, sim_vhd_disk_implemented},
{ NULL, 0, 0, NULL}
};
/* Set disk format */
t_stat sim_disk_set_fmt (UNIT *uptr, int32 val, CONST char *cptr, void *desc)
{
uint32 f;
if (uptr == NULL)
return SCPE_IERR;
if ((cptr == NULL) || (*cptr == '\0'))
return SCPE_ARG;
for (f = 0; fmts[f].name; f++) {
if (fmts[f].name && (MATCH_CMD (cptr, fmts[f].name) == 0)) {
if ((fmts[f].impl_fnc) && (fmts[f].impl_fnc() != SCPE_OK))
return SCPE_NOFNC;
uptr->flags = (uptr->flags & ~DKUF_FMT) |
(fmts[f].fmtval << DKUF_V_FMT) | fmts[f].uflags;
return SCPE_OK;
}
}
return sim_messagef (SCPE_ARG, "Unknown disk format: %s\n", cptr);
}
/* Show disk format */
static const char *sim_disk_fmt (UNIT *uptr)
{
int32 f = DK_GET_FMT (uptr);
size_t i;
for (i = 0; fmts[i].name; i++)
if (fmts[i].fmtval == f) {
return fmts[i].name;
}
return "invalid";
}
t_stat sim_disk_show_fmt (FILE *st, UNIT *uptr, int32 val, CONST void *desc)
{
fprintf (st, "%s format", sim_disk_fmt (uptr));
return SCPE_OK;
}
/* Set disk capacity */
t_stat sim_disk_set_capac (UNIT *uptr, int32 val, CONST char *cptr, void *desc)
{
t_offset cap;
t_stat r;
DEVICE *dptr = find_dev_from_unit (uptr);
if ((cptr == NULL) || (*cptr == 0))
return SCPE_ARG;
if (uptr->flags & UNIT_ATT)
return SCPE_ALATT;
cap = (t_offset) get_uint (cptr, 10, sim_taddr_64? 2000000: 2000, &r);
if (r != SCPE_OK)
return SCPE_ARG;
uptr->capac = (t_addr)((cap * ((t_offset) 1000000))/((dptr->flags & DEV_SECTORS) ? 512 : 1));
return SCPE_OK;
}
/* Show disk capacity */
t_stat sim_disk_show_capac (FILE *st, UNIT *uptr, int32 val, CONST void *desc)
{
const char *cap_units = "B";
DEVICE *dptr = find_dev_from_unit (uptr);
t_offset capac = ((t_offset)uptr->capac)*((dptr->flags & DEV_SECTORS) ? 512 : 1);
if ((dptr->dwidth / dptr->aincr) == 16)
cap_units = "W";
if (capac) {
if (capac >= (t_offset) 1000000)
fprintf (st, "capacity=%dM%s", (uint32) (capac / ((t_offset) 1000000)), cap_units);
else if (uptr->capac >= (t_addr) 1000)
fprintf (st, "capacity=%dK%s", (uint32) (capac / ((t_offset) 1000)), cap_units);
else fprintf (st, "capacity=%d%s", (uint32) capac, cap_units);
}
else fprintf (st, "undefined capacity");
return SCPE_OK;
}
/* Test for available */
t_bool sim_disk_isavailable (UNIT *uptr)
{
struct disk_context *ctx;
t_bool is_available;
if (!(uptr->flags & UNIT_ATT)) /* attached? */
return FALSE;
ctx = (struct disk_context *)uptr->disk_ctx;
switch (DK_GET_FMT (uptr)) { /* case on format */
case DKUF_F_STD: /* SIMH format */
is_available = TRUE;
break;
case DKUF_F_VHD: /* VHD format */
is_available = TRUE;
break;
case DKUF_F_RAW: /* Raw Physical Disk Access */
if (sim_os_disk_isavailable_raw (uptr->fileref)) {
if (ctx->media_removed) {
int32 saved_switches = sim_switches;
int32 saved_quiet = sim_quiet;
char *path = (char *)malloc (1 + strlen (uptr->filename));
sim_switches = 0;
sim_quiet = 1;
strcpy (path, uptr->filename);
sim_disk_attach (uptr, path, ctx->sector_size, ctx->xfer_element_size,
FALSE, ctx->dbit, NULL, 0, 0);
sim_quiet = saved_quiet;
sim_switches = saved_switches;
free (path);
ctx->media_removed = 0;
}
}
else
ctx->media_removed = 1;
is_available = !ctx->media_removed;
break;
default:
is_available = FALSE;
break;
}
sim_debug_unit (ctx->dbit, uptr, "sim_disk_isavailable(unit=%d)=%s\n", (int)(uptr - ctx->dptr->units), is_available ? "true" : "false");
return is_available;
}
t_bool sim_disk_isavailable_a (UNIT *uptr, DISK_PCALLBACK callback)
{
t_bool r = FALSE;
AIO_CALLSETUP
r = sim_disk_isavailable (uptr);
AIO_CALL(DOP_IAVL, 0, NULL, NULL, 0, callback);
return r;
}
/* Test for write protect */
t_bool sim_disk_wrp (UNIT *uptr)
{
return (uptr->flags & DKUF_WRP)? TRUE: FALSE;
}
/* Get Disk size */
t_offset sim_disk_size (UNIT *uptr)
{
struct disk_context *ctx = (struct disk_context *)uptr->disk_ctx;
t_offset physical_size, filesystem_size;
t_bool saved_quiet = sim_quiet;
if ((uptr->flags & UNIT_ATT) == 0)
return (t_offset)-1;
physical_size = ctx->container_size;
sim_quiet = TRUE;
filesystem_size = get_filesystem_size (uptr);
sim_quiet = saved_quiet;
if ((filesystem_size == (t_offset)-1) ||
(filesystem_size < physical_size))
return physical_size;
return filesystem_size;
}
/* Enable asynchronous operation */
t_stat sim_disk_set_async (UNIT *uptr, int latency)
{
#if !defined(SIM_ASYNCH_IO)
char *msg = "Disk: can't operate asynchronously\r\n";
sim_printf ("%s", msg);
return SCPE_NOFNC;
#else
struct disk_context *ctx = (struct disk_context *)uptr->disk_ctx;
pthread_attr_t attr;
sim_debug_unit (ctx->dbit, uptr, "sim_disk_set_async(unit=%d)\n", (int)(uptr - ctx->dptr->units));
ctx->asynch_io = sim_asynch_enabled;
ctx->asynch_io_latency = latency;
if (ctx->asynch_io) {
pthread_mutex_init (&ctx->io_lock, NULL);
pthread_cond_init (&ctx->io_cond, NULL);
pthread_cond_init (&ctx->io_done, NULL);
pthread_cond_init (&ctx->startup_cond, NULL);
pthread_attr_init(&attr);
pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
pthread_mutex_lock (&ctx->io_lock);
pthread_create (&ctx->io_thread, &attr, _disk_io, (void *)uptr);
pthread_attr_destroy(&attr);
pthread_cond_wait (&ctx->startup_cond, &ctx->io_lock); /* Wait for thread to stabilize */
pthread_mutex_unlock (&ctx->io_lock);
pthread_cond_destroy (&ctx->startup_cond);
}
uptr->a_check_completion = _disk_completion_dispatch;
uptr->a_is_active = _disk_is_active;
uptr->cancel = _disk_cancel;
return SCPE_OK;
#endif
}
/* Disable asynchronous operation */
t_stat sim_disk_clr_async (UNIT *uptr)
{
#if !defined(SIM_ASYNCH_IO)
return SCPE_NOFNC;
#else
struct disk_context *ctx = (struct disk_context *)uptr->disk_ctx;
/* make sure device exists */
if (!ctx) return SCPE_UNATT;
sim_debug_unit (ctx->dbit, uptr, "sim_disk_clr_async(unit=%d)\n", (int)(uptr - ctx->dptr->units));
if (ctx->asynch_io) {
pthread_mutex_lock (&ctx->io_lock);
ctx->asynch_io = 0;
pthread_cond_signal (&ctx->io_cond);
pthread_mutex_unlock (&ctx->io_lock);
pthread_join (ctx->io_thread, NULL);
pthread_mutex_destroy (&ctx->io_lock);
pthread_cond_destroy (&ctx->io_cond);
pthread_cond_destroy (&ctx->io_done);
}
return SCPE_OK;
#endif
}
/* Read Sectors */
static t_stat _sim_disk_rdsect (UNIT *uptr, t_lba lba, uint8 *buf, t_seccnt *sectsread, t_seccnt sects)
{
t_offset da;
uint32 err, tbc;
size_t i;
struct disk_context *ctx = (struct disk_context *)uptr->disk_ctx;
sim_debug_unit (ctx->dbit, uptr, "_sim_disk_rdsect(unit=%d, lba=0x%X, sects=%d)\n", (int)(uptr - ctx->dptr->units), lba, sects);
da = ((t_offset)lba) * ctx->sector_size;
tbc = sects * ctx->sector_size;
if (sectsread)
*sectsread = 0;
while (tbc) {
size_t sectbytes;
err = sim_fseeko (uptr->fileref, da, SEEK_SET); /* set pos */
if (err)
return SCPE_IOERR;
i = sim_fread (buf, 1, tbc, uptr->fileref);
if (i < tbc) /* fill */
memset (&buf[i], 0, tbc-i);
sectbytes = (i / ctx->sector_size) * ctx->sector_size;
if (i > sectbytes)
sectbytes += ctx->sector_size;
if (sectsread)
*sectsread += sectbytes / ctx->sector_size;
err = ferror (uptr->fileref);
if (err)
return SCPE_IOERR;
tbc -= sectbytes;
if ((tbc == 0) || (i == 0))
return SCPE_OK;
da += sectbytes;
buf += sectbytes;
}
return SCPE_OK;
}
t_stat sim_disk_rdsect (UNIT *uptr, t_lba lba, uint8 *buf, t_seccnt *sectsread, t_seccnt sects)
{
t_stat r;
struct disk_context *ctx = (struct disk_context *)uptr->disk_ctx;
uint32 f = DK_GET_FMT (uptr);
t_seccnt sread = 0;
sim_debug_unit (ctx->dbit, uptr, "sim_disk_rdsect(unit=%d, lba=0x%X, sects=%d)\n", (int)(uptr - ctx->dptr->units), lba, sects);
if ((sects == 1) && /* Single sector reads */
(lba >= (uptr->capac*ctx->capac_factor)/(ctx->sector_size/((ctx->dptr->flags & DEV_SECTORS) ? ctx->sector_size : 1)))) {/* beyond the end of the disk */
memset (buf, '\0', ctx->sector_size); /* are bad block management efforts - zero buffer */
if (sectsread)
*sectsread = 1;
return SCPE_OK; /* return success */
}
if ((0 == (ctx->sector_size & (ctx->storage_sector_size - 1))) || /* Sector Aligned & whole sector transfers */
((0 == ((lba*ctx->sector_size) & (ctx->storage_sector_size - 1))) &&
(0 == ((sects*ctx->sector_size) & (ctx->storage_sector_size - 1)))) ||
(f == DKUF_F_STD) || (f == DKUF_F_VHD)) { /* or SIMH or VHD formats */
switch (f) { /* case on format */
case DKUF_F_STD: /* SIMH format */
r = _sim_disk_rdsect (uptr, lba, buf, &sread, sects);
break;
case DKUF_F_VHD: /* VHD format */
r = sim_vhd_disk_rdsect (uptr, lba, buf, &sread, sects);
break;
case DKUF_F_RAW: /* Raw Physical Disk Access */
r = sim_os_disk_rdsect (uptr, lba, buf, &sread, sects);
break;
default:
return SCPE_NOFNC;
}
if (sectsread)
*sectsread = sread;
sim_buf_swap_data (buf, ctx->xfer_element_size, (sread * ctx->sector_size) / ctx->xfer_element_size);
return r;
}
else { /* Unaligned and/or partial sector transfers in RAW mode */
size_t tbufsize = sects * ctx->sector_size + 2 * ctx->storage_sector_size;
uint8 *tbuf = (uint8*) malloc (tbufsize);
t_offset ssaddr = (lba * (t_offset)ctx->sector_size) & ~(t_offset)(ctx->storage_sector_size -1);
uint32 soffset = (uint32)((lba * (t_offset)ctx->sector_size) - ssaddr);
uint32 bytesread;
if (sectsread)
*sectsread = 0;
if (tbuf == NULL)
return SCPE_MEM;
r = sim_os_disk_read (uptr, ssaddr, tbuf, &bytesread, tbufsize & ~(ctx->storage_sector_size - 1));
sim_buf_swap_data (tbuf + soffset, ctx->xfer_element_size, (bytesread - soffset) / ctx->xfer_element_size);
memcpy (buf, tbuf + soffset, sects * ctx->sector_size);
if (sectsread) {
*sectsread = (bytesread - soffset) / ctx->sector_size;
if (*sectsread > sects)
*sectsread = sects;
}
free (tbuf);
return r;
}
}
t_stat sim_disk_rdsect_a (UNIT *uptr, t_lba lba, uint8 *buf, t_seccnt *sectsread, t_seccnt sects, DISK_PCALLBACK callback)
{
t_stat r = SCPE_OK;
AIO_CALLSETUP
r = sim_disk_rdsect (uptr, lba, buf, sectsread, sects);
AIO_CALL(DOP_RSEC, lba, buf, sectsread, sects, callback);
return r;
}
/* Write Sectors */
static t_stat _sim_disk_wrsect (UNIT *uptr, t_lba lba, uint8 *buf, t_seccnt *sectswritten, t_seccnt sects)
{
t_offset da;
uint32 err, tbc;
size_t i;
struct disk_context *ctx = (struct disk_context *)uptr->disk_ctx;
sim_debug_unit (ctx->dbit, uptr, "_sim_disk_wrsect(unit=%d, lba=0x%X, sects=%d)\n", (int)(uptr - ctx->dptr->units), lba, sects);
da = ((t_offset)lba) * ctx->sector_size;
tbc = sects * ctx->sector_size;
if (sectswritten)
*sectswritten = 0;
err = sim_fseeko (uptr->fileref, da, SEEK_SET); /* set pos */
if (err)
return SCPE_IOERR;
i = sim_fwrite (buf, ctx->xfer_element_size, tbc/ctx->xfer_element_size, uptr->fileref);
if (sectswritten)
*sectswritten += (t_seccnt)((i * ctx->xfer_element_size + ctx->sector_size - 1)/ctx->sector_size);
err = ferror (uptr->fileref);
if (err)
return SCPE_IOERR;
return SCPE_OK;
}
t_stat sim_disk_wrsect (UNIT *uptr, t_lba lba, uint8 *buf, t_seccnt *sectswritten, t_seccnt sects)
{
struct disk_context *ctx = (struct disk_context *)uptr->disk_ctx;
uint32 f = DK_GET_FMT (uptr);
t_stat r;
uint8 *tbuf = NULL;
sim_debug_unit (ctx->dbit, uptr, "sim_disk_wrsect(unit=%d, lba=0x%X, sects=%d)\n", (int)(uptr - ctx->dptr->units), lba, sects);
if (uptr->dynflags & UNIT_DISK_CHK) {
DEVICE *dptr = find_dev_from_unit (uptr);
uint32 capac_factor = ((dptr->dwidth / dptr->aincr) >= 32) ? 8 : ((dptr->dwidth / dptr->aincr) == 16) ? 2 : 1; /* capacity units (quadword: 8, word: 2, byte: 1) */
t_lba total_sectors = (t_lba)((uptr->capac*capac_factor)/(ctx->sector_size/((dptr->flags & DEV_SECTORS) ? 512 : 1)));
t_lba sect;
for (sect = 0; sect < sects; sect++) {
t_lba offset;
t_bool sect_error = FALSE;
for (offset = 0; offset < ctx->sector_size; offset += sizeof(uint32)) {
if (*((uint32 *)&buf[sect*ctx->sector_size + offset]) != (uint32)(lba + sect)) {
sect_error = TRUE;
break;
}
}
if (sect_error) {
uint32 save_dctrl = dptr->dctrl;
FILE *save_sim_deb = sim_deb;
sim_printf ("\n%s: Write Address Verification Error on lbn %d(0x%X) of %d(0x%X).\n", sim_uname (uptr), (int)(lba+sect), (int)(lba+sect), (int)total_sectors, (int)total_sectors);
dptr->dctrl = 0xFFFFFFFF;
sim_deb = save_sim_deb ? save_sim_deb : stdout;
sim_disk_data_trace (uptr, buf+sect*ctx->sector_size, lba+sect, ctx->sector_size, "Found", TRUE, 1);
dptr->dctrl = save_dctrl;
sim_deb = save_sim_deb;
}
}
}
switch (f) { /* case on format */
case DKUF_F_STD: /* SIMH format */
return _sim_disk_wrsect (uptr, lba, buf, sectswritten, sects);
case DKUF_F_VHD: /* VHD format */
if (!sim_end && (ctx->xfer_element_size != sizeof (char))) {
tbuf = (uint8*) malloc (sects * ctx->sector_size);
if (NULL == tbuf)
return SCPE_MEM;
sim_buf_copy_swapped (tbuf, buf, ctx->xfer_element_size, (sects * ctx->sector_size) / ctx->xfer_element_size);
buf = tbuf;
}
r = sim_vhd_disk_wrsect (uptr, lba, buf, sectswritten, sects);
free (tbuf);
return r;
case DKUF_F_RAW: /* Raw Physical Disk Access */
break; /* handle below */
default:
return SCPE_NOFNC;
}
if ((0 == (ctx->sector_size & (ctx->storage_sector_size - 1))) || /* Sector Aligned & whole sector transfers */
((0 == ((lba*ctx->sector_size) & (ctx->storage_sector_size - 1))) &&
(0 == ((sects*ctx->sector_size) & (ctx->storage_sector_size - 1))))) {
if (!sim_end && (ctx->xfer_element_size != sizeof (char))) {
tbuf = (uint8*) malloc (sects * ctx->sector_size);
if (NULL == tbuf)
return SCPE_MEM;
sim_buf_copy_swapped (tbuf, buf, ctx->xfer_element_size, (sects * ctx->sector_size) / ctx->xfer_element_size);
buf = tbuf;
}
r = sim_os_disk_wrsect (uptr, lba, buf, sectswritten, sects);
}
else { /* Unaligned and/or partial sector transfers in RAW mode */
size_t tbufsize = sects * ctx->sector_size + 2 * ctx->storage_sector_size;
t_offset ssaddr = (lba * (t_offset)ctx->sector_size) & ~(t_offset)(ctx->storage_sector_size -1);
t_offset sladdr = ((lba + sects) * (t_offset)ctx->sector_size) & ~(t_offset)(ctx->storage_sector_size -1);
uint32 soffset = (uint32)((lba * (t_offset)ctx->sector_size) - ssaddr);
uint32 byteswritten;
tbuf = (uint8*) malloc (tbufsize);
if (sectswritten)
*sectswritten = 0;
if (tbuf == NULL)
return SCPE_MEM;
/* Partial Sector writes require a read-modify-write sequence for the partial sectors */
if (soffset)
sim_os_disk_read (uptr, ssaddr, tbuf, NULL, ctx->storage_sector_size);
sim_os_disk_read (uptr, sladdr, tbuf + (size_t)(sladdr - ssaddr), NULL, ctx->storage_sector_size);
sim_buf_copy_swapped (tbuf + soffset,
buf, ctx->xfer_element_size, (sects * ctx->sector_size) / ctx->xfer_element_size);
r = sim_os_disk_write (uptr, ssaddr, tbuf, &byteswritten, (soffset + (sects * ctx->sector_size) + ctx->storage_sector_size - 1) & ~(ctx->storage_sector_size - 1));
if (sectswritten) {
*sectswritten = byteswritten / ctx->sector_size;
if (*sectswritten > sects)
*sectswritten = sects;
}
}
free (tbuf);
return r;
}
t_stat sim_disk_wrsect_a (UNIT *uptr, t_lba lba, uint8 *buf, t_seccnt *sectswritten, t_seccnt sects, DISK_PCALLBACK callback)
{
t_stat r = SCPE_OK;
AIO_CALLSETUP
r = sim_disk_wrsect (uptr, lba, buf, sectswritten, sects);
AIO_CALL(DOP_WSEC, lba, buf, sectswritten, sects, callback);
return r;
}
t_stat sim_disk_unload (UNIT *uptr)
{
struct disk_context *ctx = (struct disk_context *)uptr->disk_ctx;
switch (DK_GET_FMT (uptr)) { /* case on format */
case DKUF_F_STD: /* Simh */
case DKUF_F_VHD: /* VHD format */
ctx->media_removed = 1;
return sim_disk_detach (uptr);
case DKUF_F_RAW: /* Raw Physical Disk Access */
ctx->media_removed = 1;
return sim_os_disk_unload_raw (uptr->fileref); /* remove/eject disk */
break;
default:
return SCPE_NOFNC;
}
}
/*
This routine is called when the simulator stops and any time
the asynch mode is changed (enabled or disabled)
*/
static void _sim_disk_io_flush (UNIT *uptr)
{
uint32 f = DK_GET_FMT (uptr);
#if defined (SIM_ASYNCH_IO)
struct disk_context *ctx = (struct disk_context *)uptr->disk_ctx;
sim_disk_clr_async (uptr);
if (sim_asynch_enabled)
sim_disk_set_async (uptr, ctx->asynch_io_latency);
#endif
switch (f) { /* case on format */
case DKUF_F_STD: /* Simh */
fflush (uptr->fileref);
break;
case DKUF_F_VHD: /* Virtual Disk */
sim_vhd_disk_flush (uptr->fileref);
break;
case DKUF_F_RAW: /* Physical */
sim_os_disk_flush_raw (uptr->fileref);
break;
}
}
static t_stat _err_return (UNIT *uptr, t_stat stat)
{
free (uptr->filename);
uptr->filename = NULL;
free (uptr->disk_ctx);
uptr->disk_ctx = NULL;
return stat;
}
static t_stat _sim_disk_rdsect_interleave (UNIT *uptr, t_lba lba, uint8 *buf, t_seccnt *sectsread, t_seccnt sects, uint16 sectpertrack, uint16 interleave, uint16 skew, uint16 offset)
{
struct disk_context *ctx = (struct disk_context *)uptr->disk_ctx;
t_lba sectno = lba, psa;
t_stat status;
if (sectsread)
*sectsread = 0;
do {
uint16 i, track, sector;
/*
* Map an LBA address into a physical sector address
*/
track = sectno / sectpertrack;
i = (sectno % sectpertrack) * interleave;
if (i >= sectpertrack)
i++;
sector = (i + (track * skew)) % sectpertrack;
psa = sector + (track * sectpertrack) + offset;
status = sim_disk_rdsect(uptr, psa, buf, NULL, 1);
sects--;
buf += ctx->sector_size;
sectno++;
if (sectsread)
*sectsread += 1;
} while ((sects != 0) && (status == SCPE_OK));
return status;
}
/*
* Version of sim_disk_rdsect() specifically for filesystem detection of DEC
* file systems. The routine handles regular DEC disks (physsectsz == 0) and
* RX01/RX02 disks (physsectsz == 128 or == 256) which ignore track 0,
* interleave physical sectors 2:1 for the remaining tracks and have a skew
* 6 sectors at the end of a track.
*/
#define RX0xNSECT 26 /* 26 sectors/track */
#define RX0xINTER 2 /* 2 sector interleave */
#define RX0xISKEW 6 /* 6 sectors interleave per track */
static t_stat _DEC_rdsect (UNIT *uptr, t_lba lba, uint8 *buf, t_seccnt *sectsread, t_seccnt sects, uint32 physsectsz)
{
if (physsectsz == 0) /* Use device natural sector size */
return sim_disk_rdsect(uptr, lba, buf, sectsread, sects);
return _sim_disk_rdsect_interleave(uptr, lba, buf, sectsread, sects, RX0xNSECT, RX0xINTER, RX0xISKEW, RX0xNSECT);
}
#pragma pack(push,1)
typedef struct _ODS1_HomeBlock
{
uint16 hm1_w_ibmapsize;
uint32 hm1_l_ibmaplbn;
uint16 hm1_w_maxfiles;
uint16 hm1_w_cluster;
uint16 hm1_w_devtype;
uint16 hm1_w_structlev;
#define HM1_C_LEVEL1 0401
#define HM1_C_LEVEL2 0402
uint8 hm1_t_volname[12];
uint8 hm1_b_fill_1[4];
uint16 hm1_w_volowner;
uint16 hm1_w_protect;
uint16 hm1_w_volchar;
uint16 hm1_w_fileprot;
uint8 hm1_b_fill_2[6];
uint8 hm1_b_window;
uint8 hm1_b_extend;
uint8 hm1_b_lru_lim;
uint8 hm1_b_fill_3[11];
uint16 hm1_w_checksum1;
uint8 hm1_t_credate[14];
uint8 hm1_b_fill_4[382];
uint32 hm1_l_serialnum;
uint8 hm1_b_fill_5[12];
uint8 hm1_t_volname2[12];
uint8 hm1_t_ownername[12];
uint8 hm1_t_format[12];
uint8 hm1_t_fill_6[2];
uint16 hm1_w_checksum2;
} ODS1_HomeBlock;
typedef struct _ODS2_HomeBlock
{
uint32 hm2_l_homelbn;
uint32 hm2_l_alhomelbn;
uint32 hm2_l_altidxlbn;
uint8 hm2_b_strucver;
uint8 hm2_b_struclev;