blob: 0e69b2ffebe4b8a20f7bc6d7769162a9df8195bd [file] [log] [blame]
* This file is part of the coreboot project.
* Copyright (C) 2013 Google, Inc.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
#ifndef MEMRANGE_H_
#define MEMRANGE_H_
#include <device/resource.h>
/* A memranges structure consists of a list of range_entry(s). The structure
* is exposed so that a memranges can be used on the stack if needed. */
struct memranges {
struct range_entry *entries;
/* Each region within a memranges structure is represented by a
* range_entry structure. Use the associated range_entry_(base|end|size|tag)
* functions to interrogate its properties. i.e. don't rely on one's own
* interpretation of the fields. */
struct range_entry {
resource_t begin;
resource_t end;
unsigned long tag;
struct range_entry *next;
/* Return inclusive base address of memory range. */
static inline resource_t range_entry_base(const struct range_entry *r)
return r->begin;
/* Return exclusive end address of memory range. */
static inline resource_t range_entry_end(const struct range_entry *r)
return r->end + 1;
/* Return size of of memory range. */
static inline resource_t range_entry_size(const struct range_entry *r)
return r->end - r->begin + 1;
static inline unsigned long range_entry_tag(const struct range_entry *r)
return r->tag;
static inline void range_entry_update_tag(struct range_entry *r,
unsigned long new_tag)
r->tag = new_tag;
/* Iterate over each entry in a memranges structure. Ranges cannot
* be deleted while processing each entry as the list cannot be safely
* traversed after such an operation.
* r - range_entry pointer.
* ranges - memranges pointer */
#define memranges_each_entry(r, ranges) \
for (r = (ranges)->entries; r != NULL; r = r->next)
/* Initialize and fill a memranges structure according to the
* mask and match type for all memory resources. Tag each entry with the
* specified type. */
void memranges_init(struct memranges *ranges,
unsigned long mask, unsigned long match,
unsigned long tag);
/* Remove and free all entries within the memranges structure. */
void memranges_teardown(struct memranges *ranges);
/* Add memory resources that match with the corresponding mask and match.
* Each entry will be tagged with the provided tag. e.g. To populate
* all cacheable memory resources in the range:
* memranges_add_resources(range, IORESOURCE_CACHEABLE,
* IORESROUCE_CACHEABLE, my_cacheable_tag); */
void memranges_add_resources(struct memranges *ranges,
unsigned long mask, unsigned long match,
unsigned long tag);
/* Fill all address ranges up to limit (exclusive) not covered by an entry by
* inserting new entries with the provided tag. */
void memranges_fill_holes_up_to(struct memranges *ranges,
resource_t limit, unsigned long tag);
/* Create a hole in the range by deleting/modifying entries that overlap with
* the region specified by base and size. */
void memranges_create_hole(struct memranges *ranges,
resource_t base, resource_t size);
/* Insert a resource to the given memranges. All existing ranges
* covered by range specified by base and size will be removed before a
* new one is added. */
void memranges_insert(struct memranges *ranges,
resource_t base, resource_t size, unsigned long tag);
/* Returns next entry after the provided entry. NULL if r is last. */
struct range_entry *memranges_next_entry(struct memranges *ranges,
const struct range_entry *r);
#endif /* MEMRANGE_H_ */