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9dc51afa2c
Add a facility allowing cached data to be discarded in order to satisfy memory allocations that would otherwise fail. Signed-off-by: Michael Brown <mcb30@ipxe.org>
77 lines
1.8 KiB
C
77 lines
1.8 KiB
C
#ifndef _IPXE_MALLOC_H
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#define _IPXE_MALLOC_H
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#include <stdint.h>
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/** @file
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*
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* Dynamic memory allocation
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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/*
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* Prototypes for the standard functions (malloc() et al) are in
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* stdlib.h. Include <ipxe/malloc.h> only if you need the
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* non-standard functions, such as malloc_dma().
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*
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*/
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#include <stdlib.h>
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#include <ipxe/tables.h>
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extern size_t freemem;
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extern void * __malloc alloc_memblock ( size_t size, size_t align );
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extern void free_memblock ( void *ptr, size_t size );
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extern void mpopulate ( void *start, size_t len );
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extern void mdumpfree ( void );
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/**
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* Allocate memory for DMA
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*
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* @v size Requested size
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* @v align Physical alignment
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* @ret ptr Memory, or NULL
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*
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* Allocates physically-aligned memory for DMA.
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*
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* @c align must be a power of two. @c size may not be zero.
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*/
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static inline void * __malloc malloc_dma ( size_t size, size_t phys_align ) {
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return alloc_memblock ( size, phys_align );
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}
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/**
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* Free memory allocated with malloc_dma()
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*
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* @v ptr Memory allocated by malloc_dma(), or NULL
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* @v size Size of memory, as passed to malloc_dma()
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*
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* Memory allocated with malloc_dma() can only be freed with
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* free_dma(); it cannot be freed with the standard free().
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*
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* If @c ptr is NULL, no action is taken.
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*/
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static inline void free_dma ( void *ptr, size_t size ) {
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free_memblock ( ptr, size );
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}
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/** A cache discarder */
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struct cache_discarder {
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/**
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* Discard some cached data
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*
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* @ret discarded Number of cached items discarded
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*/
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unsigned int ( * discard ) ( void );
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};
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/** Cache discarder table */
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#define CACHE_DISCARDERS __table ( struct cache_discarder, "cache_discarders" )
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/** Declare a cache discarder */
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#define __cache_discarder __table_entry ( CACHE_DISCARDERS, 01 )
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#endif /* _IPXE_MALLOC_H */
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