lib/linux_compat.c

   1
   2 #include <common.h>
   3 #include <malloc.h>
   4 #include <memalign.h>
   5 #include <linux/compat.h>
   6
   7 struct p_current cur = {
   8         .pid = 1,
   9 };
  10 __maybe_unused struct p_current *current = &cur;
  11
  12 unsigned long copy_from_user(void *dest, const void *src,
  13                      unsigned long count)
  14 {
  15         memcpy((void *)dest, (void *)src, count);
  16         return 0;
  17 }
  18
  19 void *kmalloc(size_t size, int flags)
  20 {
  21         void *p;
  22
  23         p = malloc_cache_aligned(size);
  24         if (p && flags & __GFP_ZERO)
  25                 memset(p, 0, size);
  26
  27         return p;
  28 }
  29
  30 struct kmem_cache *get_mem(int element_sz)
  31 {
  32         struct kmem_cache *ret;
  33
  34         ret = memalign(ARCH_DMA_MINALIGN, sizeof(struct kmem_cache));
  35         ret->sz = element_sz;
  36
  37         return ret;
  38 }
  39
  40 void *kmem_cache_alloc(struct kmem_cache *obj, int flag)
  41 {
  42         return malloc_cache_aligned(obj->sz);
  43 }
  44
  45 /**
  46  * kmemdup - duplicate region of memory
  47  *
  48  * @src: memory region to duplicate
  49  * @len: memory region length
  50  * @gfp: GFP mask to use
  51  *
  52  * Return: newly allocated copy of @src or %NULL in case of error
  53  */
  54 void *kmemdup(const void *src, size_t len, gfp_t gfp)
  55 {
  56         void *p;
  57
  58         p = kmalloc(len, gfp);
  59         if (p)
  60                 memcpy(p, src, len);
  61         return p;
  62 }