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authorArnd Bergmann <arnd@arndb.de>2009-06-26 08:14:36 +0200
committerJesper Nilsson <jesper.nilsson@axis.com>2009-08-31 18:38:11 +0200
commitd8fb91e8344ff11381fc47d43e0b234065be4bd0 (patch)
tree36b72b3b6fff5f53d53cc14587dbc96f73d29ae5 /arch/cris
parentadda766193ea1cf3137484a9521972d080d0b7af (diff)
downloadop-kernel-dev-d8fb91e8344ff11381fc47d43e0b234065be4bd0.zip
op-kernel-dev-d8fb91e8344ff11381fc47d43e0b234065be4bd0.tar.gz
CRIS: add pgprot_noncached
On CRIS, the high address bit controls caching, which means that we can add a pgprot_noncached() macro that sets this bit in the address. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Diffstat (limited to 'arch/cris')
-rw-r--r--arch/cris/include/arch-v10/arch/mmu.h9
-rw-r--r--arch/cris/include/arch-v32/arch/mmu.h10
-rw-r--r--arch/cris/include/asm/pgtable.h2
3 files changed, 13 insertions, 8 deletions
diff --git a/arch/cris/include/arch-v10/arch/mmu.h b/arch/cris/include/arch-v10/arch/mmu.h
index df84f17..e829e5a 100644
--- a/arch/cris/include/arch-v10/arch/mmu.h
+++ b/arch/cris/include/arch-v10/arch/mmu.h
@@ -33,10 +33,10 @@ typedef struct
/* CRIS PTE bits (see R_TLB_LO in the register description)
*
- * Bit: 31-13 12-------4 3 2 1 0
- * ________________________________________________
- * | pfn | reserved | global | valid | kernel | we |
- * |_____|__________|________|_______|________|_____|
+ * Bit: 31 30-13 12-------4 3 2 1 0
+ * _______________________________________________________
+ * | cache |pfn | reserved | global | valid | kernel | we |
+ * |_______|____|__________|________|_______|________|_____|
*
* (pfn = physical frame number)
*/
@@ -53,6 +53,7 @@ typedef struct
#define _PAGE_VALID (1<<2) /* page is valid */
#define _PAGE_SILENT_READ (1<<2) /* synonym */
#define _PAGE_GLOBAL (1<<3) /* global page - context is ignored */
+#define _PAGE_NO_CACHE (1<<31) /* part of the uncached memory map */
/* Bits the HW doesn't care about but the kernel uses them in SW */
diff --git a/arch/cris/include/arch-v32/arch/mmu.h b/arch/cris/include/arch-v32/arch/mmu.h
index 6bcdc3f..c1a13e0 100644
--- a/arch/cris/include/arch-v32/arch/mmu.h
+++ b/arch/cris/include/arch-v32/arch/mmu.h
@@ -28,10 +28,10 @@ typedef struct
/*
* CRISv32 PTE bits:
*
- * Bit: 31-13 12-5 4 3 2 1 0
- * +-----+------+--------+-------+--------+-------+---------+
- * | pfn | zero | global | valid | kernel | write | execute |
- * +-----+------+--------+-------+--------+-------+---------+
+ * Bit: 31 30-13 12-5 4 3 2 1 0
+ * +-------+-----+------+--------+-------+--------+-------+---------+
+ * | cache | pfn | zero | global | valid | kernel | write | execute |
+ * +-------+-----+------+--------+-------+--------+-------+---------+
*/
/*
@@ -45,6 +45,8 @@ typedef struct
#define _PAGE_VALID (1 << 3) /* Page is valid. */
#define _PAGE_SILENT_READ (1 << 3) /* Same as above. */
#define _PAGE_GLOBAL (1 << 4) /* Global page. */
+#define _PAGE_NO_CACHE (1 << 31) /* part of the uncached memory map */
+
/*
* The hardware doesn't care about these bits, but the kernel uses them in
diff --git a/arch/cris/include/asm/pgtable.h b/arch/cris/include/asm/pgtable.h
index 50aa974..1fcce00 100644
--- a/arch/cris/include/asm/pgtable.h
+++ b/arch/cris/include/asm/pgtable.h
@@ -197,6 +197,8 @@ static inline pte_t __mk_pte(void * page, pgprot_t pgprot)
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{ pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; }
+#define pgprot_noncached(prot) __pgprot((pgprot_val(prot) | _PAGE_NO_CACHE))
+
/* pte_val refers to a page in the 0x4xxxxxxx physical DRAM interval
* __pte_page(pte_val) refers to the "virtual" DRAM interval
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