u-boot/lib/linux_compat.c
Masahiro Yamada e3332e1a1a Make kmalloc'ed memory really DMA-safe
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>
2018-08-31 11:59:44 -04:00

42 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);
}