514 lines
17 KiB
C
514 lines
17 KiB
C
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/*****************************************************************************\
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* layout.c
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* $Id: layout.c,v 1.2 2006/01/24 00:25:40 dsp_llnl Exp $
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*****************************************************************************
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* Copyright (C) 2002-2005 The Regents of the University of California.
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* Produced at the Lawrence Livermore National Laboratory.
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* Written by Dave Peterson <dsp@llnl.gov> <dave_peterson@pobox.com>.
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* UCRL-CODE-2003-012
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* All rights reserved.
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*
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* This file is part of lxbios, a utility for reading/writing LinuxBIOS
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* parameters and displaying information from the LinuxBIOS table.
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* For details, see <http://www.llnl.gov/linux/lxbios/>.
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*
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* Please also read the file DISCLAIMER which is included in this software
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* distribution.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License (as published by the
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* Free Software Foundation) version 2, dated June 1991.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the IMPLIED WARRANTY OF
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the terms and
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* conditions of the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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\*****************************************************************************/
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#include "common.h"
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#include "layout.h"
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#include "cmos_lowlevel.h"
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typedef struct cmos_entry_item_t cmos_entry_item_t;
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struct cmos_entry_item_t
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{ cmos_entry_t item;
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cmos_entry_item_t *next;
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};
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typedef struct cmos_enum_item_t cmos_enum_item_t;
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struct cmos_enum_item_t
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{ cmos_enum_t item;
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cmos_enum_item_t *next;
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};
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static void default_cmos_layout_get_fn (void);
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static int areas_overlap (unsigned area_0_start, unsigned area_0_length,
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unsigned area_1_start, unsigned area_1_length);
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static int entries_overlap (const cmos_entry_t *p, const cmos_entry_t *q);
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static const cmos_enum_item_t * find_first_cmos_enum_id (unsigned config_id);
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const char checksum_param_name[] = "check_sum";
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/* Newer versions of LinuxBIOS store the 3 pieces of information below in the
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* LinuxBIOS table so we don't have to rely on hardcoded values.
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*/
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/* This is the offset from the start of CMOS of the first byte that the
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* checksum is calculated over.
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*/
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#define CMOS_CHECKSUM_START 49
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/* This is the offset from the start of CMOS of the last byte that the
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* checksum is calculated over.
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*/
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#define CMOS_CHECKSUM_END 125
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/* This is the offset from the start of CMOS where the LinuxBIOS checksum is
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* stored.
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*/
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#define CMOS_CHECKSUM_INDEX 126
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/* index of first byte of checksummed area */
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unsigned cmos_checksum_start = CMOS_CHECKSUM_START;
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/* index of last byte of checksummed area */
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unsigned cmos_checksum_end = CMOS_CHECKSUM_END;
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/* index of first byte of CMOS checksum (a big-endian 16-bit value) */
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unsigned cmos_checksum_index = CMOS_CHECKSUM_INDEX;
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/* List is sorted in ascending order according to 'bit' field in
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* cmos_entry_t.
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*/
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static cmos_entry_item_t *cmos_entry_list = NULL;
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/* List is sorted in ascending order: first by 'config_id' and then by
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* 'value'.
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*/
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static cmos_enum_item_t *cmos_enum_list = NULL;
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static cmos_layout_get_fn_t cmos_layout_get_fn = default_cmos_layout_get_fn;
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/****************************************************************************
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* entries_overlap
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*
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* Return 1 if cmos entries 'p' and 'q' overlap. Else return 0.
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****************************************************************************/
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static inline int entries_overlap (const cmos_entry_t *p,
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const cmos_entry_t *q)
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{ return areas_overlap(p->bit, p->length, q->bit, q->length); }
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/****************************************************************************
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* cmos_entry_to_const_item
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*
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* Return a pointer to the cmos_entry_item_t that 'p' is embedded within.
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****************************************************************************/
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static inline const cmos_entry_item_t * cmos_entry_to_const_item
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(const cmos_entry_t *p)
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{ static const cmos_entry_t *pos = &((cmos_entry_item_t *) 0)->item;
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unsigned long offset, address;
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offset = (unsigned long) pos;
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address = ((unsigned long) p) - offset;
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return (const cmos_entry_item_t *) address;
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}
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/****************************************************************************
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* cmos_enum_to_const_item
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*
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* Return a pointer to the cmos_enum_item_t that 'p' is embedded within.
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****************************************************************************/
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static inline const cmos_enum_item_t * cmos_enum_to_const_item
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(const cmos_enum_t *p)
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{ static const cmos_enum_t *pos = &((cmos_enum_item_t *) 0)->item;
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unsigned long offset, address;
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offset = (unsigned long) pos;
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address = ((unsigned long) p) - offset;
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return (const cmos_enum_item_t *) address;
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}
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/****************************************************************************
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* register_cmos_layout_get_fn
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*
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* Set 'fn' as the function that will be called to retrieve CMOS layout
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* information.
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****************************************************************************/
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void register_cmos_layout_get_fn (cmos_layout_get_fn_t fn)
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{ cmos_layout_get_fn = fn; }
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/****************************************************************************
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* get_cmos_layout
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*
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* Retrieve CMOS layout information and store it in our internal repository.
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****************************************************************************/
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void get_cmos_layout (void)
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{ cmos_layout_get_fn(); }
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/****************************************************************************
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* add_cmos_entry
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*
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* Attempt to add CMOS entry 'e' to our internal repository of layout
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* information. Return OK on success or an error code on failure. If
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* operation fails because 'e' overlaps an existing CMOS entry, '*conflict'
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* will be set to point to the overlapping entry.
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****************************************************************************/
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int add_cmos_entry (const cmos_entry_t *e, const cmos_entry_t **conflict)
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{ cmos_entry_item_t *item, *prev, *new_entry;
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*conflict = NULL;
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if (e->length < 1)
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return LAYOUT_ENTRY_BAD_LENGTH;
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if ((new_entry = (cmos_entry_item_t *) malloc(sizeof(*new_entry))) == NULL)
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out_of_memory();
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new_entry->item = *e;
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if (cmos_entry_list == NULL)
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{ new_entry->next = NULL;
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cmos_entry_list = new_entry;
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return OK;
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}
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/* Find place in list to insert new entry. List is sorted in ascending
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* order.
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*/
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for (item = cmos_entry_list, prev = NULL;
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(item != NULL) && (item->item.bit < e->bit);
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prev = item, item = item->next);
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if (prev == NULL)
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{ if (entries_overlap(e, &cmos_entry_list->item))
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{ *conflict = &cmos_entry_list->item;
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goto fail;
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}
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new_entry->next = cmos_entry_list;
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cmos_entry_list = new_entry;
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return OK;
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}
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if (entries_overlap(&prev->item, e))
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{ *conflict = &prev->item;
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goto fail;
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}
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if ((item != NULL) && entries_overlap(e, &item->item))
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{ *conflict = &item->item;
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goto fail;
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}
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new_entry->next = item;
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prev->next = new_entry;
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return OK;
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fail:
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free(new_entry);
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return LAYOUT_ENTRY_OVERLAP;
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}
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/****************************************************************************
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* find_cmos_entry
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*
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* Search for a CMOS entry whose name is 'name'. Return pointer to matching
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* entry or NULL if entry not found.
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****************************************************************************/
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const cmos_entry_t * find_cmos_entry (const char name[])
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{ cmos_entry_item_t *item;
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for (item = cmos_entry_list; item != NULL; item = item->next)
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{ if (!strcmp(item->item.name, name))
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return &item->item;
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}
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return NULL;
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}
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/****************************************************************************
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* first_cmos_entry
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*
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* Return a pointer to the first CMOS entry in our list or NULL if list is
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* empty.
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****************************************************************************/
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const cmos_entry_t * first_cmos_entry (void)
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{ return (cmos_entry_list == NULL) ? NULL : &cmos_entry_list->item; }
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/****************************************************************************
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* next_cmos_entry
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*
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* Return a pointer to next entry in list after 'last' or NULL if no more
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* entries.
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****************************************************************************/
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const cmos_entry_t * next_cmos_entry (const cmos_entry_t *last)
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{ const cmos_entry_item_t *last_item, *next_item;
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last_item = cmos_entry_to_const_item(last);
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next_item = last_item->next;
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return (next_item == NULL) ? NULL : &next_item->item;
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}
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/****************************************************************************
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* add_cmos_enum
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*
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* Attempt to add CMOS enum 'e' to our internal repository of layout
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* information. Return OK on success or an error code on failure.
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****************************************************************************/
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int add_cmos_enum (const cmos_enum_t *e)
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{ cmos_enum_item_t *item, *prev, *new_enum;
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if ((new_enum = (cmos_enum_item_t *) malloc(sizeof(*new_enum))) == NULL)
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out_of_memory();
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new_enum->item = *e;
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if (cmos_enum_list == NULL)
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{ new_enum->next = NULL;
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cmos_enum_list = new_enum;
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return OK;
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}
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/* The list of enums is sorted in ascending order, first by 'config_id' and
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* then by 'value'. Look for the first enum whose 'config_id' field
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* matches 'e'.
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*/
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for (item = cmos_enum_list, prev = NULL;
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(item != NULL) && (item->item.config_id < e->config_id);
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prev = item, item = item->next);
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if (item == NULL)
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{ new_enum->next = NULL;
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prev->next = new_enum;
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return OK;
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}
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if (item->item.config_id > e->config_id)
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{ new_enum->next = item;
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if (prev == NULL)
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cmos_enum_list = new_enum;
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else
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prev->next = new_enum;
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return OK;
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}
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/* List already contains at least one enum whose 'config_id' matches 'e'.
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* Now find proper place to insert 'e' based on 'value'.
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*/
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while (item->item.value < e->value)
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{ prev = item;
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item = item->next;
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if ((item == NULL) || (item->item.config_id != e->config_id))
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{ new_enum->next = item;
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prev->next = new_enum;
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return OK;
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}
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}
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if (item->item.value == e->value)
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{ free(new_enum);
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return LAYOUT_DUPLICATE_ENUM;
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}
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new_enum->next = item;
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if (prev == NULL)
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cmos_enum_list = new_enum;
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else
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prev->next = new_enum;
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return OK;
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}
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/****************************************************************************
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* find_cmos_enum
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*
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* Search for an enum that matches 'config_id' and 'value'. If found, return
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* a pointer to the mathcing enum. Else return NULL.
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****************************************************************************/
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const cmos_enum_t * find_cmos_enum (unsigned config_id,
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unsigned long long value)
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{ const cmos_enum_item_t *item;
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if ((item = find_first_cmos_enum_id(config_id)) == NULL)
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return NULL;
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while (item->item.value < value)
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{ item = item->next;
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if ((item == NULL) || (item->item.config_id != config_id))
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return NULL;
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}
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return (item->item.value == value) ? &item->item : NULL;
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}
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/****************************************************************************
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* first_cmos_enum
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*
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* Return a pointer to the first CMOS enum in our list or NULL if list is
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* empty.
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****************************************************************************/
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const cmos_enum_t * first_cmos_enum (void)
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{ return (cmos_enum_list == NULL) ? NULL : &cmos_enum_list->item; }
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/****************************************************************************
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* next_cmos_enum
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*
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* Return a pointer to next enum in list after 'last' or NULL if no more
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* enums.
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****************************************************************************/
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const cmos_enum_t * next_cmos_enum (const cmos_enum_t *last)
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{ const cmos_enum_item_t *last_item, *next_item;
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last_item = cmos_enum_to_const_item(last);
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next_item = last_item->next;
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return (next_item == NULL) ? NULL : &next_item->item;
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}
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||
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|
/****************************************************************************
|
||
|
|
* first_cmos_enum_id
|
||
|
|
*
|
||
|
|
* Return a pointer to the first CMOS enum in our list that matches
|
||
|
|
* 'config_id' or NULL if there are no matching enums.
|
||
|
|
****************************************************************************/
|
||
|
|
const cmos_enum_t * first_cmos_enum_id (unsigned config_id)
|
||
|
|
{ const cmos_enum_item_t *item;
|
||
|
|
|
||
|
|
item = find_first_cmos_enum_id(config_id);
|
||
|
|
return (item == NULL) ? NULL : &item->item;
|
||
|
|
}
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* next_cmos_enum_id
|
||
|
|
*
|
||
|
|
* Return a pointer to next enum in list after 'last' that matches the
|
||
|
|
* 'config_id' field of 'last' or NULL if there are no more matching enums.
|
||
|
|
****************************************************************************/
|
||
|
|
const cmos_enum_t * next_cmos_enum_id (const cmos_enum_t *last)
|
||
|
|
{ const cmos_enum_item_t *item;
|
||
|
|
|
||
|
|
item = cmos_enum_to_const_item(last)->next;
|
||
|
|
return ((item == NULL) || (item->item.config_id != last->config_id)) ?
|
||
|
|
NULL : &item->item;
|
||
|
|
}
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* is_checksum_name
|
||
|
|
*
|
||
|
|
* Return 1 if 'name' matches the name of the parameter representing the CMOS
|
||
|
|
* checksum. Else return 0.
|
||
|
|
****************************************************************************/
|
||
|
|
int is_checksum_name (const char name[])
|
||
|
|
{ return !strcmp(name, checksum_param_name); }
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* checksum_layout_to_bytes
|
||
|
|
*
|
||
|
|
* On entry, '*layout' contains checksum-related layout information expressed
|
||
|
|
* in bits. Perform sanity checking on the information and convert it from
|
||
|
|
* bit positions to byte positions. Return OK on success or an error code if
|
||
|
|
* a sanity check fails.
|
||
|
|
****************************************************************************/
|
||
|
|
int checksum_layout_to_bytes (cmos_checksum_layout_t *layout)
|
||
|
|
{ unsigned start, end, index;
|
||
|
|
|
||
|
|
start = layout->summed_area_start;
|
||
|
|
end = layout->summed_area_end;
|
||
|
|
index = layout->checksum_at;
|
||
|
|
|
||
|
|
if (start % 8)
|
||
|
|
return LAYOUT_SUMMED_AREA_START_NOT_ALIGNED;
|
||
|
|
|
||
|
|
if ((end % 8) != 7)
|
||
|
|
return LAYOUT_SUMMED_AREA_END_NOT_ALIGNED;
|
||
|
|
|
||
|
|
if (index % 8)
|
||
|
|
return LAYOUT_CHECKSUM_LOCATION_NOT_ALIGNED;
|
||
|
|
|
||
|
|
if (end <= start)
|
||
|
|
return LAYOUT_INVALID_SUMMED_AREA;
|
||
|
|
|
||
|
|
/* Convert bit positions to byte positions. */
|
||
|
|
start /= 8;
|
||
|
|
end /= 8; /* equivalent to "end = ((end - 7) / 8)" */
|
||
|
|
index /= 8;
|
||
|
|
|
||
|
|
if (verify_cmos_byte_index(start) || verify_cmos_byte_index(end))
|
||
|
|
return LAYOUT_SUMMED_AREA_OUT_OF_RANGE;
|
||
|
|
|
||
|
|
if (verify_cmos_byte_index(index))
|
||
|
|
return LAYOUT_CHECKSUM_LOCATION_OUT_OF_RANGE;
|
||
|
|
|
||
|
|
/* checksum occupies 16 bits */
|
||
|
|
if (areas_overlap(start, end - start + 1, index, index + 1))
|
||
|
|
return LAYOUT_CHECKSUM_OVERLAPS_SUMMED_AREA;
|
||
|
|
|
||
|
|
layout->summed_area_start = start;
|
||
|
|
layout->summed_area_end = end;
|
||
|
|
layout->checksum_at = index;
|
||
|
|
return OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* checksum_layout_to_bits
|
||
|
|
*
|
||
|
|
* On entry, '*layout' contains checksum-related layout information expressed
|
||
|
|
* in bytes. Convert this information to bit positions.
|
||
|
|
****************************************************************************/
|
||
|
|
void checksum_layout_to_bits (cmos_checksum_layout_t *layout)
|
||
|
|
{ layout->summed_area_start *= 8;
|
||
|
|
layout->summed_area_end = (layout->summed_area_end * 8) + 7;
|
||
|
|
layout->checksum_at *= 8;
|
||
|
|
}
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* default_cmos_layout_get_fn
|
||
|
|
*
|
||
|
|
* If this function is ever called, it means that an appropriate callback for
|
||
|
|
* obtaining CMOS layout information was not set before attempting to
|
||
|
|
* retrieve layout information.
|
||
|
|
****************************************************************************/
|
||
|
|
static void default_cmos_layout_get_fn (void)
|
||
|
|
{ BUG(); }
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* areas_overlap
|
||
|
|
*
|
||
|
|
* Return 1 if the two given areas overlap. Else return 0.
|
||
|
|
****************************************************************************/
|
||
|
|
static int areas_overlap (unsigned area_0_start, unsigned area_0_length,
|
||
|
|
unsigned area_1_start, unsigned area_1_length)
|
||
|
|
{ unsigned area_0_end, area_1_end;
|
||
|
|
|
||
|
|
area_0_end = area_0_start + area_0_length - 1;
|
||
|
|
area_1_end = area_1_start + area_1_length - 1;
|
||
|
|
return ((area_1_start <= area_0_end) && (area_0_start <= area_1_end));
|
||
|
|
}
|
||
|
|
|
||
|
|
/****************************************************************************
|
||
|
|
* find_first_cmos_enum_id
|
||
|
|
*
|
||
|
|
* Return a pointer to the first item in our list of enums that matches
|
||
|
|
* 'config_id'. Return NULL if there is no matching enum.
|
||
|
|
****************************************************************************/
|
||
|
|
static const cmos_enum_item_t * find_first_cmos_enum_id (unsigned config_id)
|
||
|
|
{ cmos_enum_item_t *item;
|
||
|
|
|
||
|
|
for (item = cmos_enum_list;
|
||
|
|
(item != NULL) && (item->item.config_id < config_id);
|
||
|
|
item = item->next);
|
||
|
|
|
||
|
|
return ((item == NULL) || (item->item.config_id > config_id)) ?
|
||
|
|
NULL : item;
|
||
|
|
}
|