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/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef MEMRANGE_H_
#define MEMRANGE_H_
#include <device/resource.h>
#include <stdbool.h>
#include <stddef.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;
/* coreboot doesn't have a free() function. Therefore, keep a cache of
* free'd entries. */
struct range_entry *free_list;
/* Alignment(log 2) for base and end addresses of the range. */
unsigned char align;
};
/* 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;
};
/* Initialize a range_entry with inclusive beginning address and exclusive
* end address along with the appropriate tag. */
static inline void range_entry_init(struct range_entry *re,
resource_t incl_begin, resource_t excl_end,
unsigned long tag)
{
re->begin = incl_begin;
re->end = excl_end - 1;
re->tag = tag;
re->next = NULL;
}
/* 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;
}
static inline bool memranges_is_empty(const struct memranges *ranges)
{
return ranges->entries == NULL;
}
/* 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 memranges structure providing an optional array of range_entry
* to use as the free list. Additionally, it accepts an align parameter that
* represents the required alignment(log 2) of addresses. */
void memranges_init_empty_with_alignment(struct memranges *ranges,
struct range_entry *free,
size_t num_free, unsigned char align);
/* Initialize and fill a memranges structure according to the
* mask and match type for all memory resources. Tag each entry with the
* specified type. Additionally, it accepts an align parameter that
* represents the required alignment(log 2) of addresses. */
void memranges_init_with_alignment(struct memranges *ranges,
unsigned long mask, unsigned long match,
unsigned long tag, unsigned char align);
/* Initialize memranges structure providing an optional array of range_entry
* to use as the free list. Addresses are default aligned to 4KiB(2^12). */
#define memranges_init_empty(__ranges, __free, __num_free) \
memranges_init_empty_with_alignment(__ranges, __free, __num_free, 12);
/* Initialize and fill a memranges structure according to the
* mask and match type for all memory resources. Tag each entry with the
* specified type. Addresses are default aligned to 4KiB(2^12). */
#define memranges_init(__ranges, __mask, __match, __tag) \
memranges_init_with_alignment(__ranges, __mask, __match, __tag, 12);
/* Clone a memrange. The new memrange has the same entries as the old one. */
void memranges_clone(struct memranges *newranges, struct memranges *oldranges);
/* 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);
/* Add memory resources that match with the corresponding mask and match but
* also provide filter as additional check. The filter will return non-zero
* to add the resource or zero to not add the resource. Each entry will be
* tagged with the provided tag. e.g. To populate all cacheable memory
* resources in the range with a filter:
* memranges_add_resources_filter(range, IORESOURCE_CACHEABLE,
* IORESROUCE_CACHEABLE, my_cacheable_tag, filter); */
typedef int (*memrange_filter_t)(struct device *dev, struct resource *res);
void memranges_add_resources_filter(struct memranges *ranges,
unsigned long mask, unsigned long match,
unsigned long tag,
memrange_filter_t filter);
/* 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);
/* Update all entries with old_tag to new_tag. */
void memranges_update_tag(struct memranges *ranges, unsigned long old_tag,
unsigned long new_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);
/* Steals memory from the available list in given ranges as per the constraints:
* limit = Upper bound for the memory range to steal (Inclusive).
* size = Requested size for the stolen memory.
* align = Required alignment(log 2) for the starting address of the stolen memory.
* tag = Use a range that matches the given tag.
*
* If the constraints can be satisfied, this function creates a hole in the memrange,
* writes the base address of that hole to stolen_base and returns true. Otherwise it returns
* false. */
bool memranges_steal(struct memranges *ranges, resource_t limit, resource_t size,
unsigned char align, unsigned long tag, resource_t *stolen_base);
#endif /* MEMRANGE_H_ */
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