510 lines
14 KiB
C
510 lines
14 KiB
C
/* This file is part of the program psim.
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Copyright (C) 1994-1995, 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 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 _DEVICE_TREE_C_
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#define _DEVICE_TREE_C_
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#ifndef STATIC_INLINE_DEVICE_TREE
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#define STATIC_INLINE_DEVICE_TREE STATIC_INLINE
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#endif
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#include <string.h>
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#include "basics.h"
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#include "device_tree.h"
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#include "devices.h"
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#include "bfd.h"
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/* Any starting address less than this is assumed to be an OEA program
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rather than VEA. */
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#ifndef OEA_START_ADDRESS
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#define OEA_START_ADDRESS 4096
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#endif
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enum { clayton_memory_size = 0x100000 };
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/* insert the address into the device_nodes sorted list of addresses */
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INLINE_DEVICE_TREE void
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device_node_add_address(device_node *node,
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unsigned_word lower_bound,
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unsigned size,
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device_access access,
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void *init)
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{
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unsigned_word upper_bound = lower_bound + size;
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device_address *new_address;
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device_address **current_address;
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/* find the insertion point */
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current_address = &node->addresses;
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while (*current_address != NULL
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&& (*current_address)->upper_bound >= upper_bound) {
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current_address = &(*current_address)->next_address;
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}
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/* insert */
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new_address = ZALLOC(device_address);
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new_address->lower_bound = lower_bound;
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new_address->upper_bound = lower_bound + size;
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new_address->size = size;
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new_address->access = access;
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new_address->init = init;
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new_address->next_address = *current_address;
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*current_address = new_address;
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}
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/* create a new device tree optionally making it a child of the parent
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node */
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INLINE_DEVICE_TREE device_node *
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device_node_create(device_node *parent,
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char *name,
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device_type type,
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device_callbacks *callbacks,
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void *data)
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{
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device_node *new_node;
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new_node = ZALLOC(device_node);
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new_node->parent = parent;
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new_node->name = name;
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new_node->type = type;
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new_node->callbacks = callbacks;
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new_node->data = data;
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if (parent != NULL) {
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new_node->sibling = parent->children;
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parent->children = new_node;
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}
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return new_node;
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}
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/* Binary file:
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The specified file is a binary, assume VEA is required, construct a
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fake device tree based on the addresses of the text / data segments
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requested by the binary */
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/* Update the fake device tree so that memory is allocated for this
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section */
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STATIC_INLINE_DEVICE_TREE void
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update_memory_node_for_section(bfd *abfd,
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asection *the_section,
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PTR obj)
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{
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unsigned_word section_vma;
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unsigned_word section_size;
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device_access section_access;
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void *section_init;
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device_node *memory = (device_node*)obj;
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/* skip the section if no memory to allocate */
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if (! (bfd_get_section_flags(abfd, the_section) & SEC_ALLOC))
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return;
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/* check/ignore any sections of size zero */
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section_size = bfd_get_section_size_before_reloc(the_section);
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if (section_size == 0)
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return;
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/* find where it is to go */
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section_vma = bfd_get_section_vma(abfd, the_section);
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TRACE(trace_device_tree,
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("name=%-7s, vma=0x%.8x, size=%6d, flags=%3x(%s%s%s%s )\n",
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bfd_get_section_name(abfd, the_section),
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section_vma, section_size,
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bfd_get_section_flags(abfd, the_section),
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bfd_get_section_flags(abfd, the_section) & SEC_LOAD ? " LOAD" : "",
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bfd_get_section_flags(abfd, the_section) & SEC_CODE ? " CODE" : "",
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bfd_get_section_flags(abfd, the_section) & SEC_DATA ? " DATA" : "",
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bfd_get_section_flags(abfd, the_section) & SEC_ALLOC ? " ALLOC" : "",
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bfd_get_section_flags(abfd, the_section) & SEC_READONLY ? " READONLY" : ""
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));
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if (bfd_get_section_flags(abfd, the_section) & SEC_LOAD) {
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section_init = zalloc(section_size);
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if (!bfd_get_section_contents(abfd,
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the_section,
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section_init, 0,
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section_size)) {
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bfd_perror("core:load_section()");
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error("load of data failed");
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return;
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}
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}
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else {
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section_init = NULL;
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}
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/* determine the devices access */
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if (bfd_get_section_flags(abfd, the_section) & SEC_CODE)
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section_access = (device_is_readable | device_is_executable);
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else if (bfd_get_section_flags(abfd, the_section) & SEC_READONLY)
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section_access = device_is_readable;
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else
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section_access = (device_is_readable | device_is_writeable);
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/* find our memory and add this section to its list of addresses */
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device_node_add_address(memory,
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section_vma,
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section_size,
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section_access,
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section_init);
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}
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/* construct the device tree from the executable */
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STATIC_INLINE_DEVICE_TREE device_node *
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create_option_device_node(device_node *root,
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bfd *image)
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{
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int oea = (bfd_get_start_address(image) < OEA_START_ADDRESS);
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int elf = (image->xvec->flavour == bfd_target_elf_flavour);
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device_node *option_node;
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/* the option node and than its members */
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option_node = device_node_create(root, "options", options_device,
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NULL, NULL);
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/* which endian are we ? */
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device_node_create(option_node,
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"little-endian?",
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boolean_type_device,
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NULL,
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(void*)(image->xvec->byteorder_big_p ? 0 : -1));
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/* what is the initial entry point */
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device_node_create(option_node,
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"program-counter",
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integer_type_device,
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NULL,
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(void*)(bfd_get_start_address(image)));
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/* address of top of boot stack */
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TRACE(trace_tbd, ("create_optioin_device_node() - TBD - NT/OpenBoot?\n"));
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device_node_create(option_node,
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"stack-pointer",
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integer_type_device,
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NULL,
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(void *)((oea)
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? clayton_memory_size /* OEA */
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: ((elf)
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? 0xe0000000 /* elf */
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: 0x20000000 /* xcoff */)));
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/* execution environment */
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device_node_create(option_node,
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"vea?",
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boolean_type_device,
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NULL,
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(void *)((oea) ? 0 : -1));
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/* what type of binary */
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TRACE(trace_tbd, ("create_optioin_device_node() - TBD - NT/OpenBoot?\n"));
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device_node_create(option_node,
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"elf?",
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boolean_type_device,
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NULL,
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(void *)((elf) ? -1 : 0));
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/* must all memory transfers be naturally aligned? */
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device_node_create(option_node,
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"aligned?",
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boolean_type_device,
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NULL,
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(void*)((WITH_ALIGNMENT == NONSTRICT_ALIGNMENT
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|| image->xvec->byteorder_big_p
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|| !oea)
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? 0
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: -1));
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return option_node;
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}
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/* clatyon is a simple machine that does not require interrupts or any
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thing else */
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STATIC_INLINE_DEVICE_TREE device_node *
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create_clayton_device_tree(bfd *image)
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{
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device_node *root;
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device_node *io_node;
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device_node *data_node;
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device_node *memory_node;
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/* the root */
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root = ZALLOC(device_node);
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/* memory - clayton has 2mb of RAM at location 0 */
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memory_node = device_node_create(root,
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"memory",
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memory_device,
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NULL,
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NULL);
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device_node_add_address(memory_node, 0x0, clayton_memory_size,
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(device_is_readable
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| device_is_writeable
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| device_is_executable),
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NULL);
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/* io address space */
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io_node = device_node_create(root, "io", bus_device, NULL, NULL);
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/* and IO devices */
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find_device_descriptor("console")
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->creator(io_node, "console@0x400000,0");
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find_device_descriptor("halt")
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->creator(io_node, "halt@0x500000,0");
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find_device_descriptor("icu")
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->creator(io_node, "icu@0x600000,0");
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/* data to load */
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data_node = device_node_create(root, "image", data_device, NULL, NULL);
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bfd_map_over_sections(image,
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update_memory_node_for_section,
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(PTR)data_node);
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/* options */
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create_option_device_node(root, image);
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return root;
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}
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/* user mode executable build up a device tree that reflects this */
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STATIC_INLINE_DEVICE_TREE device_node *
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create_vea_device_tree(bfd *image)
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{
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device_node *root;
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device_node *memory_node;
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device_node *option_node;
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/* the root */
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root = ZALLOC(device_node);
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/* memory */
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memory_node = device_node_create(root, "memory", memory_device,
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NULL, NULL);
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bfd_map_over_sections(image,
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update_memory_node_for_section,
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(PTR)memory_node);
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/* options - only endian so far */
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option_node = create_option_device_node(root, image);
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return root;
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}
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/* create a device tree from the specified file */
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INLINE_DEVICE_TREE device_node *
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device_tree_create(const char *file_name)
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{
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bfd *image;
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device_node *tree;
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bfd_init(); /* could be redundant but ... */
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/* open the file */
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image = bfd_openr(file_name, NULL);
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if (image == NULL) {
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bfd_perror("open failed:");
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error("nothing loaded\n");
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return NULL;
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}
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/* check it is valid */
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if (!bfd_check_format(image, bfd_object)) {
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printf_filtered("create_device_tree() - FIXME - should check more bfd bits\n");
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printf_filtered("create_device_tree() - %s not an executable, assume device file\n", file_name);
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bfd_close(image);
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image = NULL;
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}
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/* depending on what was found about the file, load it */
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if (image != NULL) {
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if (bfd_get_start_address(image) == 0) {
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TRACE(trace_device_tree, ("create_device_tree() - clayton image\n"));
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tree = create_clayton_device_tree(image);
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}
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else if (bfd_get_start_address(image) > 0) {
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TRACE(trace_device_tree, ("create_device_tree() - vea image\n"));
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tree = create_vea_device_tree(image);
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}
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bfd_close(image);
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}
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else {
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error("TBD - create_device_tree() text file defining device tree\n");
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tree = NULL;
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}
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return tree;
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}
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/* traverse a device tree applying prefix/postfix functions to it */
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INLINE_DEVICE_TREE void
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device_tree_traverse(device_node *root,
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device_tree_traverse_function *prefix,
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device_tree_traverse_function *postfix,
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void *data)
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{
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device_node *child;
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if (prefix != NULL)
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prefix(root, data);
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for (child = root->children; child != NULL; child = child->sibling) {
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device_tree_traverse(child, prefix, postfix, data);
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}
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if (postfix != NULL)
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postfix(root, data);
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}
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/* query the device tree */
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INLINE_DEVICE_TREE device_node *
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device_tree_find_node(device_node *root,
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const char *path)
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{
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char *chp;
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int name_len;
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device_node *child;
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/* strip off any leading `/', `../' or `./' */
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while (1) {
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if (strncmp(path, "/", strlen("/")) == 0) {
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while (root->parent != NULL)
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root = root->parent;
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path += strlen("/");
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}
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else if (strncmp(path, "./", strlen("./")) == 0) {
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root = root;
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path += strlen("./");
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}
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else if (strncmp(path, "../", strlen("../")) == 0) {
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if (root->parent != NULL)
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root = root->parent;
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path += strlen("../");
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}
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else {
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break;
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}
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}
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/* find the qualified (with @) and unqualified names in the path */
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chp = strchr(path, '/');
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name_len = (chp == NULL
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? strlen(path)
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: chp - path);
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/* search through children for a match */
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for (child = root->children;
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child != NULL;
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child = child->sibling) {
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if (strncmp(path, child->name, name_len) == 0
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&& (strlen(child->name) == name_len
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|| strchr(child->name, '@') == child->name + name_len)) {
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if (path[name_len] == '\0')
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return child;
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else
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return device_tree_find_node(child, path + name_len + 1);
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}
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}
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return NULL;
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}
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INLINE_DEVICE_TREE device_node *device_tree_find_next_node
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(device_node *root,
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const char *path,
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device_node *last);
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INLINE_DEVICE_TREE signed_word
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device_tree_find_int(device_node *root,
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const char *path)
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{
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device_node *int_node = device_tree_find_node(root, path);
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if (int_node == NULL) {
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error("device_tree_find_int() - node %s does not exist\n", path);
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return 0;
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}
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else if (int_node->type != integer_type_device) {
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error("device_tree_find_int() - node %s is not an int\n", path);
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return 0;
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}
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else {
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return (signed_word)(int_node->data);
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}
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}
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INLINE_DEVICE_TREE const char *device_tree_find_string
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(device_node *root,
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const char *path);
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INLINE_DEVICE_TREE int
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device_tree_find_boolean(device_node *root,
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const char *path)
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{
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device_node *int_node = device_tree_find_node(root, path);
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if (int_node == NULL) {
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error("device_tree_find_boolean() - node %s does not exist\n", path);
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return 0;
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}
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else if (int_node->type != boolean_type_device) {
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error("device_tree_find_boolean() - node %s is not a boolean\n", path);
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return 0;
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}
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else {
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return (signed_word)(int_node->data);
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}
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}
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INLINE_DEVICE_TREE void *device_tree_find_bytes
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(device_node *root,
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const char *path);
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/* dump out a device node and addresses */
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INLINE_DEVICE_TREE void
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device_tree_dump(device_node *device,
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void *ignore_data_argument)
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{
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printf_filtered("(device_node@0x%x\n", device);
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printf_filtered(" (parent 0x%x)\n", device->parent);
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printf_filtered(" (children 0x%x)\n", device->children);
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printf_filtered(" (sibling 0x%x)\n", device->sibling);
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printf_filtered(" (name %s)\n", device->name ? device->name : "(null)");
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printf_filtered(" (type %d)\n", device->type);
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printf_filtered(" (handlers 0x%x)\n", device->callbacks);
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printf_filtered(" (addresses %d)\n", device->addresses);
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printf_filtered(" (data %d)\n", device->data);
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printf_filtered(")\n");
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}
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#endif /* _DEVICE_TREE_C_ */
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