mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-17 15:38:51 +09:00
![Masahiro Yamada](/assets/img/avatar_default.png)
In Linux, the memory returned by kmalloc() is DMA-capable. However, it is not true in U-Boot. At a glance, kmalloc() in U-Boot returns address aligned with ARCH_DMA_MINALIGN. However, it never pads the allocated memory. This half-way house is completely useless because calling kmalloc() and malloc() in this order causes a cache sharing problem. Change the implementation to call malloc_cache_aligned(), which allocates really DMA-capable memory. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
43 lines
724 B
C
43 lines
724 B
C
|
|
#include <common.h>
|
|
#include <memalign.h>
|
|
#include <linux/compat.h>
|
|
|
|
struct p_current cur = {
|
|
.pid = 1,
|
|
};
|
|
__maybe_unused struct p_current *current = &cur;
|
|
|
|
unsigned long copy_from_user(void *dest, const void *src,
|
|
unsigned long count)
|
|
{
|
|
memcpy((void *)dest, (void *)src, count);
|
|
return 0;
|
|
}
|
|
|
|
void *kmalloc(size_t size, int flags)
|
|
{
|
|
void *p;
|
|
|
|
p = malloc_cache_aligned(size);
|
|
if (flags & __GFP_ZERO)
|
|
memset(p, 0, size);
|
|
|
|
return p;
|
|
}
|
|
|
|
struct kmem_cache *get_mem(int element_sz)
|
|
{
|
|
struct kmem_cache *ret;
|
|
|
|
ret = memalign(ARCH_DMA_MINALIGN, sizeof(struct kmem_cache));
|
|
ret->sz = element_sz;
|
|
|
|
return ret;
|
|
}
|
|
|
|
void *kmem_cache_alloc(struct kmem_cache *obj, int flag)
|
|
{
|
|
return malloc_cache_aligned(obj->sz);
|
|
}
|