src/commonlib/mem_pool.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /* This file is part of the coreboot project. */
   3
   4 #include <commonlib/helpers.h>
   5 #include <commonlib/mem_pool.h>
   6
   7 void *mem_pool_alloc(struct mem_pool *mp, size_t sz)
   8 {
   9         void *p;
  10
  11         /* Make all allocations be at least 8 byte aligned. */
  12         sz = ALIGN_UP(sz, 8);
  13
  14         /* Determine if any space available. */
  15         if ((mp->size - mp->free_offset) < sz)
  16                 return NULL;
  17
  18         p = &mp->buf[mp->free_offset];
  19
  20         mp->free_offset += sz;
  21         mp->last_alloc = p;
  22
  23         return p;
  24 }
  25
  26 void mem_pool_free(struct mem_pool *mp, void *p)
  27 {
  28         /* Determine if p was the most recent allocation. */
  29         if (p == NULL || mp->last_alloc != p)
  30                 return;
  31
  32         mp->free_offset = mp->last_alloc - mp->buf;
  33         /* No way to track allocation before this one. */
  34         mp->last_alloc = NULL;
  35 }