178 lines
6.9 KiB
C
178 lines
6.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef MEMRANGE_H_
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#define MEMRANGE_H_
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#include <device/resource.h>
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#include <stdbool.h>
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#include <stddef.h>
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/* A memranges structure consists of a list of range_entry(s). The structure
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* is exposed so that a memranges can be used on the stack if needed. */
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struct memranges {
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struct range_entry *entries;
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/* coreboot doesn't have a free() function. Therefore, keep a cache of
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* free'd entries. */
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struct range_entry *free_list;
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/* Alignment(log 2) for base and end addresses of the range. */
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unsigned char align;
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};
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/* Each region within a memranges structure is represented by a
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* range_entry structure. Use the associated range_entry_(base|end|size|tag)
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* functions to interrogate its properties. i.e. don't rely on one's own
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* interpretation of the fields. */
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struct range_entry {
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resource_t begin;
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resource_t end;
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unsigned long tag;
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struct range_entry *next;
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};
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/* Initialize a range_entry with inclusive beginning address and exclusive
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* end address along with the appropriate tag. */
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static inline void range_entry_init(struct range_entry *re,
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resource_t incl_begin, resource_t excl_end,
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unsigned long tag)
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{
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re->begin = incl_begin;
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re->end = excl_end - 1;
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re->tag = tag;
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re->next = NULL;
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}
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/* Return inclusive base address of memory range. */
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static inline resource_t range_entry_base(const struct range_entry *r)
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{
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return r->begin;
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}
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/* Return exclusive end address of memory range. */
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static inline resource_t range_entry_end(const struct range_entry *r)
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{
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return r->end + 1;
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}
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/* Return size of memory range. */
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static inline resource_t range_entry_size(const struct range_entry *r)
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{
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return r->end - r->begin + 1;
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}
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static inline unsigned long range_entry_tag(const struct range_entry *r)
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{
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return r->tag;
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}
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static inline void range_entry_update_tag(struct range_entry *r,
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unsigned long new_tag)
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{
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r->tag = new_tag;
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}
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static inline bool memranges_is_empty(const struct memranges *ranges)
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{
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return ranges->entries == NULL;
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}
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/* Iterate over each entry in a memranges structure. Ranges cannot
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* be deleted while processing each entry as the list cannot be safely
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* traversed after such an operation.
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* r - range_entry pointer.
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* ranges - memranges pointer */
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#define memranges_each_entry(r, ranges) \
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for (r = (ranges)->entries; r != NULL; r = r->next)
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/* Initialize memranges structure providing an optional array of range_entry
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* to use as the free list. Additionally, it accepts an align parameter that
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* represents the required alignment(log 2) of addresses. */
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void memranges_init_empty_with_alignment(struct memranges *ranges,
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struct range_entry *free,
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size_t num_free, unsigned char align);
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/* Initialize and fill a memranges structure according to the
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* mask and match type for all memory resources. Tag each entry with the
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* specified type. Additionally, it accepts an align parameter that
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* represents the required alignment(log 2) of addresses. */
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void memranges_init_with_alignment(struct memranges *ranges,
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unsigned long mask, unsigned long match,
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unsigned long tag, unsigned char align);
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/* Initialize memranges structure providing an optional array of range_entry
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* to use as the free list. Addresses are default aligned to 4KiB(2^12). */
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#define memranges_init_empty(__ranges, __free, __num_free) \
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memranges_init_empty_with_alignment(__ranges, __free, __num_free, 12)
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/* Initialize and fill a memranges structure according to the
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* mask and match type for all memory resources. Tag each entry with the
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* specified type. Addresses are default aligned to 4KiB(2^12). */
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#define memranges_init(__ranges, __mask, __match, __tag) \
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memranges_init_with_alignment(__ranges, __mask, __match, __tag, 12)
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/* Clone a memrange. The new memrange has the same entries as the old one. */
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void memranges_clone(struct memranges *newranges, struct memranges *oldranges);
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/* Remove and free all entries within the memranges structure. */
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void memranges_teardown(struct memranges *ranges);
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/* Add memory resources that match with the corresponding mask and match.
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* Each entry will be tagged with the provided tag. e.g. To populate
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* all cacheable memory resources in the range:
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* memranges_add_resources(range, IORESOURCE_CACHEABLE,
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* IORESROUCE_CACHEABLE, my_cacheable_tag); */
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void memranges_add_resources(struct memranges *ranges,
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unsigned long mask, unsigned long match,
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unsigned long tag);
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/* Add memory resources that match with the corresponding mask and match but
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* also provide filter as additional check. The filter will return non-zero
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* to add the resource or zero to not add the resource. Each entry will be
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* tagged with the provided tag. e.g. To populate all cacheable memory
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* resources in the range with a filter:
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* memranges_add_resources_filter(range, IORESOURCE_CACHEABLE,
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* IORESROUCE_CACHEABLE, my_cacheable_tag, filter); */
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typedef int (*memrange_filter_t)(struct device *dev, struct resource *res);
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void memranges_add_resources_filter(struct memranges *ranges,
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unsigned long mask, unsigned long match,
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unsigned long tag,
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memrange_filter_t filter);
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/* Fill all address ranges up to limit (exclusive) not covered by an entry by
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* inserting new entries with the provided tag. */
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void memranges_fill_holes_up_to(struct memranges *ranges,
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resource_t limit, unsigned long tag);
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/* Create a hole in the range by deleting/modifying entries that overlap with
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* the region specified by base and size. */
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void memranges_create_hole(struct memranges *ranges,
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resource_t base, resource_t size);
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/* Insert a resource to the given memranges. All existing ranges
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* covered by range specified by base and size will be removed before a
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* new one is added. */
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void memranges_insert(struct memranges *ranges,
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resource_t base, resource_t size, unsigned long tag);
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/* Update all entries with old_tag to new_tag. */
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void memranges_update_tag(struct memranges *ranges, unsigned long old_tag,
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unsigned long new_tag);
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/* Returns next entry after the provided entry. NULL if r is last. */
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struct range_entry *memranges_next_entry(struct memranges *ranges,
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const struct range_entry *r);
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/* Steals memory from the available list in given ranges as per the constraints:
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* limit = Upper bound for the memory range to steal (Inclusive).
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* size = Requested size for the stolen memory.
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* align = Required alignment(log 2) for the starting address of the stolen memory.
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* tag = Use a range that matches the given tag.
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* from_top = Steal the highest possible range.
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*
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* If the constraints can be satisfied, this function creates a hole in the memrange,
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* writes the base address of that hole to stolen_base and returns true. Otherwise it returns
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* false. */
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bool memranges_steal(struct memranges *ranges, resource_t limit, resource_t size,
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unsigned char align, unsigned long tag, resource_t *stolen_base,
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bool from_top);
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#endif /* MEMRANGE_H_ */
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