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authorMike Frysinger <vapier@gentoo.org>2009-06-07 16:31:52 -0400
committerMike Frysinger <vapier@gentoo.org>2009-06-22 21:15:34 -0400
commite56e03b0cfeb997a4be9ad874c193824364942e0 (patch)
tree5a49f9a42d1577c13ee59d016bd0630c60de58d1 /arch/blackfin/include
parentac1b7c378ef26fba6694d5f118fe7fc16fee2fe2 (diff)
downloadlinux-2.6.38-lt-ux500-e56e03b0cfeb997a4be9ad874c193824364942e0.tar.gz
Blackfin: unify memory region checks between kgdb and traps
The kgdb (in multiple places) and traps code developed pretty much identical checks for how to access different regions of the Blackfin memory map, but each wasn't 100%, so unify them to avoid duplication, bitrot, and bugs with edge cases. Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin/include')
-rw-r--r--arch/blackfin/include/asm/uaccess.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/uaccess.h b/arch/blackfin/include/asm/uaccess.h
index 8894e9ffbb5..2f469a1f80f 100644
--- a/arch/blackfin/include/asm/uaccess.h
+++ b/arch/blackfin/include/asm/uaccess.h
@@ -265,4 +265,26 @@ __clear_user(void *to, unsigned long n)
#define clear_user(to, n) __clear_user(to, n)
+/* How to interpret these return values:
+ * CORE: can be accessed by core load or dma memcpy
+ * CORE_ONLY: can only be accessed by core load
+ * DMA: can only be accessed by dma memcpy
+ * IDMA: can only be accessed by interprocessor dma memcpy (BF561)
+ * ITEST: can be accessed by isram memcpy or dma memcpy
+ */
+enum {
+ BFIN_MEM_ACCESS_CORE = 0,
+ BFIN_MEM_ACCESS_CORE_ONLY,
+ BFIN_MEM_ACCESS_DMA,
+ BFIN_MEM_ACCESS_IDMA,
+ BFIN_MEM_ACCESS_ITEST,
+};
+/**
+ * bfin_mem_access_type() - what kind of memory access is required
+ * @addr: the address to check
+ * @size: number of bytes needed
+ * @return: <0 is error, >=0 is BFIN_MEM_ACCESS_xxx enum (see above)
+ */
+int bfin_mem_access_type(unsigned long addr, unsigned long size);
+
#endif /* _BLACKFIN_UACCESS_H */