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-rw-r--r--sim/ppc/hw_disk.c557
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diff --git a/sim/ppc/hw_disk.c b/sim/ppc/hw_disk.c
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--- a/sim/ppc/hw_disk.c
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-/* This file is part of the program psim.
-
- Copyright (C) 1994-1997, Andrew Cagney <cagney@highland.com.au>
-
- 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.
-
- */
-
-
-#ifndef _HW_DISK_C_
-#define _HW_DISK_C_
-
-#include "device_table.h"
-
-#include "pk.h"
-
-#include <stdio.h>
-
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-
-#ifndef SEEK_SET
-#define SEEK_SET 0
-#endif
-
-/* DEVICE
-
-
- cdrom - read-only removable mass storage device
-
- disk - mass storage device
-
- floppy - removable mass storage device
-
-
- DESCRIPTION
-
-
- Mass storage devices such as a hard-disk or cdrom-drive are not
- normally directly connected to the processor. Instead, these
- devices are attached to a logical bus, such as SCSI or IDE, and
- then a controller of that bus is made accessible to the processor.
-
- Reflecting this, within a device tree, mass storage devices such as
- a <<cdrom>>, <<disk>> or <<floppy>> are created as children of of a
- logical bus controller node (such as a SCSI or IDE interface).
- That controller, in turn, would be made the child of a physical bus
- node that is directly accessible to the processor.
-
- The above mass storage devices provide two interfaces - a logical
- and a physical.
-
- At the physical level the <<device_io_...>> functions can be used
- perform reads and writes of the raw media. The address being
- interpreted as an offset from the start of the disk.
-
- At the logical level, it is possible to create an instance of the
- disk that provides access to any of the physical media, a disk
- partition, or even a file within a partition. The <<disk-label>>
- package, which implements this functionality, is described
- elsewhere. Both the Open Firmware and Moto BUG rom emulations
- support this interface.
-
- Block devices such as the <<floppy>> and <<cdrom>> have removable
- media. At the programmer level, the media can be changed using the
- <<change_media>> ioctl. From within GDB, a <<change-media>>
- operation can be initated by using the command.
-
- | (gdb) sim
-
-
- PROPERTIES
-
-
- file = <file-name> (required)
-
- The name of the file that contains an image of the disk. For
- <<disk>> and <<floppy>> devices, the image will be opened for both
- reading and writing. Multiple image files may be specified, the
- second and later files being opened when <<change-media>> (with a
- NULL file name) being specified.
-
-
- block-size = <nr-bytes> (optional)
-
- The value is returned by the block-size method. The default value
- is 512 bytes.
-
-
- max-transfer = <nr-bytes> (optional)
-
- The value is returned by the max-transfer method. The default value
- is 512 bytes.
-
-
- #blocks = <nr-blocks> (optional)
-
- The value is returned by the #blocks method. If no value is
- present then -1 is returned.
-
-
- read-only = <anything> (optional)
-
- If this property is present, the disk file image is always opened
- read-only.
-
- EXAMPLES
-
-
- Enable tracing
-
- | $ psim -t 'disk-device' \
-
-
- Add a CDROM and disk to an IDE bus. Specify the host operating
- system's cd drive as the CD-ROM image.
-
- | -o '/pci/ide/disk@0/file "disk-image' \
- | -o '/pci/ide/cdrom@1/file "/dev/cd0a' \
-
-
- As part of the code implementing a logical bus device (for instance
- the IDE controller), locate the CDROM device and then read block
- 47.
-
- | device *cdrom = device_tree_find_device(me, "cdrom");
- | char block[512];
- | device_io_read_buffer(cdrom, buf, 0,
- 0, 47 * sizeof(block), // space, address
- sizeof(block), NULL, 0);
-
-
- Use the device instance interface to read block 47 of the file
- called <<netbsd.elf>> on the disks default partition. Similar code
- would be used in an operating systems pre-boot loader.
-
- | device_instance *netbsd =
- | device_create_instance(root, "/pci/ide/disk:,\netbsd.elf");
- | char block[512];
- | device_instance_seek(netbsd, 0, 47 * sizeof(block));
- | device_instance_read(netbsd, block, sizeof(block));
-
-
- BUGS
-
-
- The block device specification includes mechanisms for determining
- the physical device characteristics - such as the disks size.
- Currently this mechanism is not implemented.
-
- The functionality of this device (in particular the device instance
- interface) depends on the implementation of <<disk-label>> package.
- That package may not be fully implemented.
-
- The disk does not know its size. Hence it relies on the failure of
- fread(), fwrite() and fseek() calls to detect errors.
-
- The disk size is limited by the addressable range covered by
- unsigned_word (addr). An extension would be to instead use the
- concatenated value space:addr.
-
- The method #blocks should `stat' the disk to determine the number
- of blocks if there is no #blocks property.
-
- It would appear that OpenFirmware does not define a client call for
- changing (ejecting) the media of a device.
-
- */
-
-typedef struct _hw_disk_device {
- int name_index;
- int nr_names;
- char *name;
- int read_only;
- /* unsigned_word size; */
- FILE *image;
-} hw_disk_device;
-
-typedef struct _hw_disk_instance {
- unsigned_word pos;
- hw_disk_device *disk;
-} hw_disk_instance;
-
-
-static void
-open_disk_image(device *me,
- hw_disk_device *disk,
- const char *name)
-{
- if (disk->image != NULL)
- fclose(disk->image);
- if (disk->name != NULL)
- zfree(disk->name);
- disk->name = strdup(name);
- disk->image = fopen(disk->name, disk->read_only ? "r" : "r+");
- if (disk->image == NULL) {
- perror(device_name(me));
- device_error(me, "open %s failed\n", disk->name);
- }
-
- DTRACE(disk, ("image %s (%s)\n",
- disk->name,
- (disk->read_only ? "read-only" : "read-write")));
-}
-
-static void
-hw_disk_init_address(device *me)
-{
- hw_disk_device *disk = device_data(me);
- unsigned_word address;
- int space;
- const char *name;
-
- /* attach to the parent. Since the bus is logical, attach using just
- the unit-address (size must be zero) */
- device_address_to_attach_address(device_parent(me), device_unit_address(me),
- &space, &address, me);
- device_attach_address(device_parent(me), attach_callback,
- space, address, 0/*size*/, access_read_write_exec,
- me);
-
- /* get the name of the file specifying the disk image */
- disk->name_index = 0;
- disk->nr_names = device_find_string_array_property(me, "file",
- disk->name_index, &name);
- if (!disk->nr_names)
- device_error(me, "invalid file property");
-
- /* is it a RO device? */
- disk->read_only =
- (strcmp(device_name(me), "disk") != 0
- && strcmp(device_name(me), "floppy") != 0
- && device_find_property(me, "read-only") == NULL);
-
- /* now open it */
- open_disk_image(me, disk, name);
-}
-
-static int
-hw_disk_ioctl(device *me,
- cpu *processor,
- unsigned_word cia,
- device_ioctl_request request,
- va_list ap)
-{
- switch (request) {
- case device_ioctl_change_media:
- {
- hw_disk_device *disk = device_data(me);
- const char *name = va_arg(ap, const char *);
- if (name != NULL) {
- disk->name_index = -1;
- }
- else {
- disk->name_index = (disk->name_index + 1) % disk->nr_names;
- if (!device_find_string_array_property(me, "file",
- disk->name_index, &name))
- device_error(me, "invalid file property");
- }
- open_disk_image(me, disk, name);
- }
- break;
- default:
- device_error(me, "insupported ioctl request");
- break;
- }
- return 0;
-}
-
-
-
-
-
-static unsigned
-hw_disk_io_read_buffer(device *me,
- void *dest,
- int space,
- unsigned_word addr,
- unsigned nr_bytes,
- cpu *processor,
- unsigned_word cia)
-{
- hw_disk_device *disk = device_data(me);
- unsigned nr_bytes_read;
- if (space != 0)
- device_error(me, "read - extended disk addressing unimplemented");
- if (nr_bytes == 0)
- nr_bytes_read = 0;
- else if (fseek(disk->image, addr, SEEK_SET) < 0)
- nr_bytes_read = 0;
- else if (fread(dest, nr_bytes, 1, disk->image) != 1)
- nr_bytes_read = 0;
- else
- nr_bytes_read = nr_bytes;
- DTRACE(disk, ("io-read - address 0x%lx, nr-bytes-read %d, requested %d\n",
- (unsigned long) addr, (int)nr_bytes_read, (int)nr_bytes));
- return nr_bytes_read;
-}
-
-
-static unsigned
-hw_disk_io_write_buffer(device *me,
- const void *source,
- int space,
- unsigned_word addr,
- unsigned nr_bytes,
- cpu *processor,
- unsigned_word cia)
-{
- hw_disk_device *disk = device_data(me);
- unsigned nr_bytes_written;
- if (space != 0)
- device_error(me, "write - extended disk addressing unimplemented");
- if (disk->read_only)
- nr_bytes_written = 0;
- else if (nr_bytes == 0)
- nr_bytes_written = 0;
- else if (fseek(disk->image, addr, SEEK_SET) < 0)
- nr_bytes_written = 0;
- else if (fwrite(source, nr_bytes, 1, disk->image) != 1)
- nr_bytes_written = 0;
- else
- nr_bytes_written = nr_bytes;
- DTRACE(disk, ("io-write - address 0x%lx, nr-bytes-written %d, requested %d\n",
- (unsigned long) addr, (int)nr_bytes_written, (int)nr_bytes));
- return nr_bytes_written;
-}
-
-
-/* instances of the hw_disk device */
-
-static void
-hw_disk_instance_delete(device_instance *instance)
-{
- hw_disk_instance *data = device_instance_data(instance);
- DITRACE(disk, ("delete - instance=%ld\n",
- (unsigned long)device_instance_to_external(instance)));
- zfree(data);
-}
-
-static int
-hw_disk_instance_read(device_instance *instance,
- void *buf,
- unsigned_word len)
-{
- hw_disk_instance *data = device_instance_data(instance);
- DITRACE(disk, ("read - instance=%ld len=%ld\n",
- (unsigned long)device_instance_to_external(instance),
- (long)len));
- if ((data->pos + len) < data->pos)
- return -1; /* overflow */
- if (fseek(data->disk->image, data->pos, SEEK_SET) < 0)
- return -1;
- if (fread(buf, len, 1, data->disk->image) != 1)
- return -1;
- data->pos = ftell(data->disk->image);
- return len;
-}
-
-static int
-hw_disk_instance_write(device_instance *instance,
- const void *buf,
- unsigned_word len)
-{
- hw_disk_instance *data = device_instance_data(instance);
- DITRACE(disk, ("write - instance=%ld len=%ld\n",
- (unsigned long)device_instance_to_external(instance),
- (long)len));
- if ((data->pos + len) < data->pos)
- return -1; /* overflow */
- if (data->disk->read_only)
- return -1;
- if (fseek(data->disk->image, data->pos, SEEK_SET) < 0)
- return -1;
- if (fwrite(buf, len, 1, data->disk->image) != 1)
- return -1;
- data->pos = ftell(data->disk->image);
- return len;
-}
-
-static int
-hw_disk_instance_seek(device_instance *instance,
- unsigned_word pos_hi,
- unsigned_word pos_lo)
-{
- hw_disk_instance *data = device_instance_data(instance);
- if (pos_hi != 0)
- device_error(device_instance_device(instance),
- "seek - extended addressing unimplemented");
- DITRACE(disk, ("seek - instance=%ld pos_hi=%ld pos_lo=%ld\n",
- (unsigned long)device_instance_to_external(instance),
- (long)pos_hi, (long)pos_lo));
- data->pos = pos_lo;
- return 0;
-}
-
-static int
-hw_disk_max_transfer(device_instance *instance,
- int n_stack_args,
- unsigned32 stack_args[/*n_stack_args*/],
- int n_stack_returns,
- unsigned32 stack_returns[/*n_stack_returns*/])
-{
- device *me = device_instance_device(instance);
- if ((n_stack_args != 0)
- || (n_stack_returns != 1)) {
- device_error(me, "Incorrect number of arguments for max-transfer method\n");
- return -1;
- }
- else {
- unsigned_cell max_transfer;
- if (device_find_property(me, "max-transfer"))
- max_transfer = device_find_integer_property(me, "max-transfer");
- else
- max_transfer = 512;
- DITRACE(disk, ("max-transfer - instance=%ld max-transfer=%ld\n",
- (unsigned long)device_instance_to_external(instance),
- (long int)max_transfer));
- stack_returns[0] = max_transfer;
- return 0;
- }
-}
-
-static int
-hw_disk_block_size(device_instance *instance,
- int n_stack_args,
- unsigned32 stack_args[/*n_stack_args*/],
- int n_stack_returns,
- unsigned32 stack_returns[/*n_stack_returns*/])
-{
- device *me = device_instance_device(instance);
- if ((n_stack_args != 0)
- || (n_stack_returns != 1)) {
- device_error(me, "Incorrect number of arguments for block-size method\n");
- return -1;
- }
- else {
- unsigned_cell block_size;
- if (device_find_property(me, "block-size"))
- block_size = device_find_integer_property(me, "block-size");
- else
- block_size = 512;
- DITRACE(disk, ("block-size - instance=%ld block-size=%ld\n",
- (unsigned long)device_instance_to_external(instance),
- (long int)block_size));
- stack_returns[0] = block_size;
- return 0;
- }
-}
-
-static int
-hw_disk_nr_blocks(device_instance *instance,
- int n_stack_args,
- unsigned32 stack_args[/*n_stack_args*/],
- int n_stack_returns,
- unsigned32 stack_returns[/*n_stack_returns*/])
-{
- device *me = device_instance_device(instance);
- if ((n_stack_args != 0)
- || (n_stack_returns != 1)) {
- device_error(me, "Incorrect number of arguments for block-size method\n");
- return -1;
- }
- else {
- unsigned_word nr_blocks;
- if (device_find_property(me, "#blocks"))
- nr_blocks = device_find_integer_property(me, "#blocks");
- else
- nr_blocks = -1;
- DITRACE(disk, ("#blocks - instance=%ld #blocks=%ld\n",
- (unsigned long)device_instance_to_external(instance),
- (long int)nr_blocks));
- stack_returns[0] = nr_blocks;
- return 0;
- }
-}
-
-static device_instance_methods hw_disk_instance_methods[] = {
- { "max-transfer", hw_disk_max_transfer },
- { "block-size", hw_disk_block_size },
- { "#blocks", hw_disk_nr_blocks },
- { NULL, },
-};
-
-static const device_instance_callbacks hw_disk_instance_callbacks = {
- hw_disk_instance_delete,
- hw_disk_instance_read,
- hw_disk_instance_write,
- hw_disk_instance_seek,
- hw_disk_instance_methods,
-};
-
-static device_instance *
-hw_disk_create_instance(device *me,
- const char *path,
- const char *args)
-{
- device_instance *instance;
- hw_disk_device *disk = device_data(me);
- hw_disk_instance *data = ZALLOC(hw_disk_instance);
- data->disk = disk;
- data->pos = 0;
- instance = device_create_instance_from(me, NULL,
- data,
- path, args,
- &hw_disk_instance_callbacks);
- DITRACE(disk, ("create - path=%s(%s) instance=%ld\n",
- path, args,
- (unsigned long)device_instance_to_external(instance)));
- return pk_disklabel_create_instance(instance, args);
-}
-
-static device_callbacks const hw_disk_callbacks = {
- { hw_disk_init_address, NULL },
- { NULL, }, /* address */
- { hw_disk_io_read_buffer,
- hw_disk_io_write_buffer, },
- { NULL, }, /* DMA */
- { NULL, }, /* interrupt */
- { NULL, }, /* unit */
- hw_disk_create_instance,
- hw_disk_ioctl,
-};
-
-
-static void *
-hw_disk_create(const char *name,
- const device_unit *unit_address,
- const char *args)
-{
- /* create the descriptor */
- hw_disk_device *hw_disk = ZALLOC(hw_disk_device);
- return hw_disk;
-}
-
-
-const device_descriptor hw_disk_device_descriptor[] = {
- { "disk", hw_disk_create, &hw_disk_callbacks },
- { "cdrom", hw_disk_create, &hw_disk_callbacks },
- { "floppy", hw_disk_create, &hw_disk_callbacks },
- { NULL },
-};
-
-#endif /* _HW_DISK_C_ */
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