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237 lines
5.8 KiB
C
237 lines
5.8 KiB
C
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/* This file is part of the program psim.
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Copyright (C) 1997,2008, Joel Sherrill <joel@OARcorp.com>
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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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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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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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#ifndef _HW_SHM_C_
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#define _HW_SHM_C_
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#include "device_table.h"
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#ifdef HAVE_STRING_H
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#include <string.h>
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#else
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#ifdef HAVE_STRINGS_H
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#include <strings.h>
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#endif
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#endif
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#include <sys/ipc.h>
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#include <sys/shm.h>
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/* DEVICE
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shm - map unix shared memory into psim address space
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DESCRIPTION
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This device implements an area of memory which is mapped into UNIX
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shared memory.
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PROPERTIES
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reg = <address> <size> (required)
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Determine where the memory lives in the parents address space.
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The SHM area is assumed to be of the same length.
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key = <integer> (required)
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This is the key of the unix shared memory area.
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EXAMPLES
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Enable tracing of the shm:
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Configure a 512 kilobytes of UNIX shared memory with the key 0x12345678
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mapped into psim address space at 0x0c000000.
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| -o '/shm@0x0c000000/reg 0x0c000000 0x80000' \
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| -o '/shm@0x0c000000/key 0x12345678' \
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sim/ppc/run -o '/#address-cells 1' \
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-o '/shm@0x0c000000/reg 0x0c000000 0x80000' \
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-o '/shm@0x0c000000/key 0x12345678' ../psim-hello/hello
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BUGS
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None known.
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*/
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typedef struct _hw_shm_device {
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unsigned_word physical_address;
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char *shm_address;
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unsigned sizeof_memory;
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key_t key;
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int id;
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} hw_shm_device;
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static void
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hw_shm_init_data(device *me)
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{
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hw_shm_device *shm = (hw_shm_device*)device_data(me);
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const device_unit *d;
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reg_property_spec reg;
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int i;
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/* Obtain the Key Value */
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if (device_find_property(me, "key") == NULL)
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error("shm_init_data() required key property is missing\n");
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shm->key = (key_t) device_find_integer_property(me, "key");
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DTRACE(shm, ("shm key (0x%08x)\n", shm->key) );
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/* Figure out where this memory is in address space and how long it is */
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if ( !device_find_reg_array_property(me, "reg", 0, ®) )
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error("hw_shm_init_data() no address registered\n");
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/* Determine the address and length being as paranoid as possible */
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shm->physical_address = 0xffffffff;
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shm->sizeof_memory = 0xffffffff;
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for ( i=0 ; i<reg.address.nr_cells; i++ ) {
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if (reg.address.cells[0] == 0 && reg.size.cells[0] == 0)
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continue;
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if ( shm->physical_address != 0xffffffff )
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device_error(me, "Only single celled address ranges supported\n");
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shm->physical_address = reg.address.cells[i];
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DTRACE(shm, ("shm physical_address=0x%x\n", shm->physical_address));
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shm->sizeof_memory = reg.size.cells[i];
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DTRACE(shm, ("shm length=0x%x\n", shm->sizeof_memory));
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}
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if ( shm->physical_address == 0xffffffff )
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device_error(me, "Address not specified\n" );
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if ( shm->sizeof_memory == 0xffffffff )
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device_error(me, "Length not specified\n" );
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/* Now actually attach to or create the shared memory area */
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shm->id = shmget(shm->key, shm->sizeof_memory, IPC_CREAT | 0660);
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if (shm->id == -1)
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error("hw_shm_init_data() shmget failed\n");
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shm->shm_address = shmat(shm->id, (char *)0, SHM_RND);
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if (shm->shm_address == (void *)-1)
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error("hw_shm_init_data() shmat failed\n");
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}
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static void
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hw_shm_attach_address_callback(device *me,
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attach_type attach,
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int space,
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unsigned_word addr,
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unsigned nr_bytes,
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access_type access,
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device *client) /*callback/default*/
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{
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hw_shm_device *shm = (hw_shm_device*)device_data(me);
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if (space != 0)
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error("shm_attach_address_callback() invalid address space\n");
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if (nr_bytes == 0)
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error("shm_attach_address_callback() invalid size\n");
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}
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static unsigned
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hw_shm_io_read_buffer(device *me,
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void *dest,
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int space,
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unsigned_word addr,
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unsigned nr_bytes,
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cpu *processor,
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unsigned_word cia)
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{
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hw_shm_device *shm = (hw_shm_device*)device_data(me);
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/* do we need to worry about out of range addresses? */
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DTRACE(shm, ("read %p %x %x %x\n", \
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shm->shm_address, shm->physical_address, addr, nr_bytes) );
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memcpy(dest, &shm->shm_address[addr - shm->physical_address], nr_bytes);
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return nr_bytes;
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}
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static unsigned
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hw_shm_io_write_buffer(device *me,
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const void *source,
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int space,
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unsigned_word addr,
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unsigned nr_bytes,
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cpu *processor,
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unsigned_word cia)
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{
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hw_shm_device *shm = (hw_shm_device*)device_data(me);
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/* do we need to worry about out of range addresses? */
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DTRACE(shm, ("write %p %x %x %x\n", \
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shm->shm_address, shm->physical_address, addr, nr_bytes) );
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memcpy(&shm->shm_address[addr - shm->physical_address], source, nr_bytes);
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return nr_bytes;
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}
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static device_callbacks const hw_shm_callbacks = {
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{ generic_device_init_address, hw_shm_init_data },
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{ hw_shm_attach_address_callback, }, /* address */
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{ hw_shm_io_read_buffer,
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hw_shm_io_write_buffer }, /* IO */
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{ NULL, }, /* DMA */
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{ NULL, }, /* interrupt */
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{ NULL, }, /* unit */
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NULL,
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};
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static void *
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hw_shm_create(const char *name,
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const device_unit *unit_address,
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const char *args)
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{
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hw_shm_device *shm = ZALLOC(hw_shm_device);
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return shm;
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}
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const device_descriptor hw_shm_device_descriptor[] = {
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{ "shm", hw_shm_create, &hw_shm_callbacks },
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{ NULL },
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};
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#endif /* _HW_SHM_C_ */
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