mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-19 18:53:52 +08:00
844b43adba
In the do_execve() path, argument page handling used to explicitly call flush_dcache_page() for each page, this has since been reworked and uses flush_kernel_dcache_page() instead, which is presently a nop. Doing a simple modprobe/rmmod in a loop under busybox consistently manages to crash without providing a sane flush_kernel_dcache_page() implementation, so, plug in a simple implementation. Signed-off-by: Carmelo Amoroso <carmelo73@gmail.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
82 lines
2.9 KiB
C
82 lines
2.9 KiB
C
#ifndef __ASM_SH_CACHEFLUSH_H
|
|
#define __ASM_SH_CACHEFLUSH_H
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
#ifdef CONFIG_CACHE_OFF
|
|
/*
|
|
* Nothing to do when the cache is disabled, initial flush and explicit
|
|
* disabling is handled at CPU init time.
|
|
*
|
|
* See arch/sh/kernel/cpu/init.c:cache_init().
|
|
*/
|
|
#define p3_cache_init() do { } while (0)
|
|
#define flush_cache_all() do { } while (0)
|
|
#define flush_cache_mm(mm) do { } while (0)
|
|
#define flush_cache_dup_mm(mm) do { } while (0)
|
|
#define flush_cache_range(vma, start, end) do { } while (0)
|
|
#define flush_cache_page(vma, vmaddr, pfn) do { } while (0)
|
|
#define flush_dcache_page(page) do { } while (0)
|
|
#define flush_icache_range(start, end) do { } while (0)
|
|
#define flush_icache_page(vma,pg) do { } while (0)
|
|
#define flush_dcache_mmap_lock(mapping) do { } while (0)
|
|
#define flush_dcache_mmap_unlock(mapping) do { } while (0)
|
|
#define flush_cache_sigtramp(vaddr) do { } while (0)
|
|
#define flush_icache_user_range(vma,pg,adr,len) do { } while (0)
|
|
#define __flush_wback_region(start, size) do { (void)(start); } while (0)
|
|
#define __flush_purge_region(start, size) do { (void)(start); } while (0)
|
|
#define __flush_invalidate_region(start, size) do { (void)(start); } while (0)
|
|
#else
|
|
#include <asm/cpu/cacheflush.h>
|
|
|
|
/*
|
|
* Consistent DMA requires that the __flush_xxx() primitives must be set
|
|
* for any of the enabled non-coherent caches (most of the UP CPUs),
|
|
* regardless of PIPT or VIPT cache configurations.
|
|
*/
|
|
|
|
/* Flush (write-back only) a region (smaller than a page) */
|
|
extern void __flush_wback_region(void *start, int size);
|
|
/* Flush (write-back & invalidate) a region (smaller than a page) */
|
|
extern void __flush_purge_region(void *start, int size);
|
|
/* Flush (invalidate only) a region (smaller than a page) */
|
|
extern void __flush_invalidate_region(void *start, int size);
|
|
#endif
|
|
|
|
#define ARCH_HAS_FLUSH_KERNEL_DCACHE_PAGE
|
|
static inline void flush_kernel_dcache_page(struct page *page)
|
|
{
|
|
flush_dcache_page(page);
|
|
}
|
|
|
|
#if defined(CONFIG_CPU_SH4) && !defined(CONFIG_CACHE_OFF)
|
|
extern void copy_to_user_page(struct vm_area_struct *vma,
|
|
struct page *page, unsigned long vaddr, void *dst, const void *src,
|
|
unsigned long len);
|
|
|
|
extern void copy_from_user_page(struct vm_area_struct *vma,
|
|
struct page *page, unsigned long vaddr, void *dst, const void *src,
|
|
unsigned long len);
|
|
#else
|
|
#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
|
|
do { \
|
|
flush_cache_page(vma, vaddr, page_to_pfn(page));\
|
|
memcpy(dst, src, len); \
|
|
flush_icache_user_range(vma, page, vaddr, len); \
|
|
} while (0)
|
|
|
|
#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
|
|
do { \
|
|
flush_cache_page(vma, vaddr, page_to_pfn(page));\
|
|
memcpy(dst, src, len); \
|
|
} while (0)
|
|
#endif
|
|
|
|
#define flush_cache_vmap(start, end) flush_cache_all()
|
|
#define flush_cache_vunmap(start, end) flush_cache_all()
|
|
|
|
#define HAVE_ARCH_UNMAPPED_AREA
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* __ASM_SH_CACHEFLUSH_H */
|