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143 lines
3.4 KiB
C
143 lines
3.4 KiB
C
/* This file is part of the program psim.
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Copyright (C) 1994-1996, Andrew Cagney <cagney@highland.com.au>
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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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _HW_CORE_C_
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#define _HW_CORE_C_
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#include "device_table.h"
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#include "corefile.h"
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/* DEVICE
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core - root of the device tree
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DESCRIPTION
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The core device positioned at the root of the device tree appears
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to its child devices as a normal device just like every other
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device in the tree.
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Internally it is implemented using a core object. Requests to
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attach (or detach) address spaces are passed to that core object.
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Requests to transfer (DMA) data are reflected back down the device
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tree using the core_map data transfer methods.
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PROPERTIES
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None.
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*/
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static void
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hw_core_init_address_callback(device *me)
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{
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core *memory = (core*)device_data(me);
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core_init(memory);
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}
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static void
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hw_core_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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core *memory = (core*)device_data(me);
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if (space != 0)
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error("core_attach_address_callback() invalid address space\n");
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core_attach(memory,
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attach,
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space,
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access,
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addr,
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nr_bytes,
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client);
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}
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static unsigned
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hw_core_dma_read_buffer_callback(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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{
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core *memory = (core*)device_data(me);
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return core_map_read_buffer(core_readable(memory),
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dest,
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addr,
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nr_bytes);
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}
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static unsigned
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hw_core_dma_write_buffer_callback(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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int violate_read_only_section)
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{
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core *memory = (core*)device_data(me);
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core_map *map = (violate_read_only_section
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? core_readable(memory)
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: core_writeable(memory));
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return core_map_write_buffer(map,
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source,
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addr,
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nr_bytes);
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}
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static device_callbacks const hw_core_callbacks = {
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{ hw_core_init_address_callback, },
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{ hw_core_attach_address_callback, },
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{ NULL, }, /* IO */
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{ hw_core_dma_read_buffer_callback,
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hw_core_dma_write_buffer_callback, },
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{ NULL, }, /* interrupt */
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{ generic_device_unit_decode,
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generic_device_unit_encode,
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generic_device_address_to_attach_address,
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generic_device_size_to_attach_size, },
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};
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static void *
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hw_core_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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core *memory = core_create();
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return memory;
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}
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const device_descriptor hw_core_device_descriptor[] = {
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{ "core", hw_core_create, &hw_core_callbacks },
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{ NULL },
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};
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#endif /* _HW_CORE_C_ */
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