linux/arch/powerpc/include/asm/page_32.h
FUJITA Tomonori a6eb9fe105 dma-mapping: rename ARCH_KMALLOC_MINALIGN to ARCH_DMA_MINALIGN
Now each architecture has the own dma_get_cache_alignment implementation.

dma_get_cache_alignment returns the minimum DMA alignment.  Architectures
define it as ARCH_KMALLOC_MINALIGN (it's used to make sure that malloc'ed
buffer is DMA-safe; the buffer doesn't share a cache with the others).  So
we can unify dma_get_cache_alignment implementations.

This patch:

dma_get_cache_alignment() needs to know if an architecture defines
ARCH_KMALLOC_MINALIGN or not (needs to know if architecture has DMA
alignment restriction).  However, slab.h define ARCH_KMALLOC_MINALIGN if
architectures doesn't define it.

Let's rename ARCH_KMALLOC_MINALIGN to ARCH_DMA_MINALIGN.
ARCH_KMALLOC_MINALIGN is used only in the internals of slab/slob/slub
(except for crypto).

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-08-11 08:59:21 -07:00

51 lines
1.3 KiB
C

#ifndef _ASM_POWERPC_PAGE_32_H
#define _ASM_POWERPC_PAGE_32_H
#if defined(CONFIG_PHYSICAL_ALIGN) && (CONFIG_PHYSICAL_START != 0)
#if (CONFIG_PHYSICAL_START % CONFIG_PHYSICAL_ALIGN) != 0
#error "CONFIG_PHYSICAL_START must be a multiple of CONFIG_PHYSICAL_ALIGN"
#endif
#endif
#define VM_DATA_DEFAULT_FLAGS VM_DATA_DEFAULT_FLAGS32
#ifdef CONFIG_NOT_COHERENT_CACHE
#define ARCH_DMA_MINALIGN L1_CACHE_BYTES
#endif
#ifdef CONFIG_PTE_64BIT
#define PTE_FLAGS_OFFSET 4 /* offset of PTE flags, in bytes */
#else
#define PTE_FLAGS_OFFSET 0
#endif
#ifdef CONFIG_PPC_256K_PAGES
#define PTE_SHIFT (PAGE_SHIFT - PTE_T_LOG2 - 2) /* 1/4 of a page */
#else
#define PTE_SHIFT (PAGE_SHIFT - PTE_T_LOG2) /* full page */
#endif
#ifndef __ASSEMBLY__
/*
* The basic type of a PTE - 64 bits for those CPUs with > 32 bit
* physical addressing.
*/
#ifdef CONFIG_PTE_64BIT
typedef unsigned long long pte_basic_t;
#else
typedef unsigned long pte_basic_t;
#endif
struct page;
extern void clear_pages(void *page, int order);
static inline void clear_page(void *page) { clear_pages(page, 0); }
extern void copy_page(void *to, void *from);
#include <asm-generic/getorder.h>
#define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
#define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
#endif /* __ASSEMBLY__ */
#endif /* _ASM_POWERPC_PAGE_32_H */