[PATCH 2/8] mmu: add getters for pte cache flags

[Alexander Aring <alex.aring@xxxxxxxxx>]

Currently only arm architecture provide to change pte flags.
Cache pte flags are configured at boottime.

Adding getters to get this pte flags at runtime. In additional
of remap_range you can disable or enable caching in commands, for
example memtest.

Signed-off-by: Alexander Aring <alex.aring@xxxxxxxxx>
---
 arch/arm/cpu/mmu.c              | 14 ++++++++++++++
 arch/arm/include/asm/mmu.h      | 12 ++++++++++++
 arch/blackfin/include/asm/mmu.h | 10 ++++++++++
 arch/mips/include/asm/mmu.h     | 10 ++++++++++
 arch/nios2/include/asm/mmu.h    | 10 ++++++++++
 arch/openrisc/include/asm/mmu.h | 10 ++++++++++
 arch/ppc/include/asm/mmu.h      | 10 ++++++++++
 arch/sandbox/include/asm/mmu.h  | 10 ++++++++++
 arch/x86/include/asm/mmu.h      | 10 ++++++++++
 9 files changed, 96 insertions(+)

diff --git a/arch/arm/cpu/mmu.c b/arch/arm/cpu/mmu.c
index b5c9c60..6e2ecca 100644
--- a/arch/arm/cpu/mmu.c
+++ b/arch/arm/cpu/mmu.c
@@ -52,11 +52,25 @@ extern int arm_architecture;
 #define PTE_FLAGS_CACHED_V4 (PTE_SMALL_AP_UNO_SRW | PTE_BUFFERABLE | PTE_CACHEABLE)
 #define PTE_FLAGS_UNCACHED_V4 PTE_SMALL_AP_UNO_SRW
 
+/*
+ * PTE flags to set cached and uncached areas.
+ * This will be determined at runtime.
+ */
 static uint32_t PTE_FLAGS_CACHED;
 static uint32_t PTE_FLAGS_UNCACHED;
 
 #define PTE_MASK ((1 << 12) - 1)
 
+uint32_t mmu_get_pte_cached_flags()
+{
+	return PTE_FLAGS_CACHED;
+}
+
+uint32_t mmu_get_pte_uncached_flags()
+{
+	return PTE_FLAGS_UNCACHED;
+}
+
 /*
  * Create a second level translation table for the given virtual address.
  * We initially create a flat uncached mapping on it.
diff --git a/arch/arm/include/asm/mmu.h b/arch/arm/include/asm/mmu.h
index ae1686b..f32cea6 100644
--- a/arch/arm/include/asm/mmu.h
+++ b/arch/arm/include/asm/mmu.h
@@ -43,6 +43,8 @@ unsigned long virt_to_phys(void *virt);
 void *phys_to_virt(unsigned long phys);
 void remap_range(void *_start, size_t size, uint32_t flags);
 void *map_io_sections(unsigned long physaddr, void *start, size_t size);
+uint32_t mmu_get_pte_cached_flags(void);
+uint32_t mmu_get_pte_uncached_flags(void);
 
 #else
 static inline void *dma_alloc_coherent(size_t size)
@@ -86,6 +88,16 @@ static inline void *map_io_sections(unsigned long phys, void *start, size_t size
 	return (void *)phys;
 }
 
+static inline uint32_t mmu_get_pte_cached_flags(void)
+{
+	return 0;
+}
+
+static inline uint32_t mmu_get_pte_uncached_flags(void)
+{
+	return 0;
+}
+
 #endif
 
 #ifdef CONFIG_CACHE_L2X0
diff --git a/arch/blackfin/include/asm/mmu.h b/arch/blackfin/include/asm/mmu.h
index 0485a43..eed4c33 100644
--- a/arch/blackfin/include/asm/mmu.h
+++ b/arch/blackfin/include/asm/mmu.h
@@ -5,5 +5,15 @@ static inline void remap_range(void *_start, size_t size, uint32_t flags)
 {
 }
 
+static inline uint32_t mmu_get_pte_cached_flags(void)
+{
+	return 0;
+}
+
+static inline uint32_t mmu_get_pte_uncached_flags(void)
+{
+	return 0;
+}
+
 #endif /* __ASM_MMU_H */
 
diff --git a/arch/mips/include/asm/mmu.h b/arch/mips/include/asm/mmu.h
index 0485a43..eed4c33 100644
--- a/arch/mips/include/asm/mmu.h
+++ b/arch/mips/include/asm/mmu.h
@@ -5,5 +5,15 @@ static inline void remap_range(void *_start, size_t size, uint32_t flags)
 {
 }
 
+static inline uint32_t mmu_get_pte_cached_flags(void)
+{
+	return 0;
+}
+
+static inline uint32_t mmu_get_pte_uncached_flags(void)
+{
+	return 0;
+}
+
 #endif /* __ASM_MMU_H */
 
diff --git a/arch/nios2/include/asm/mmu.h b/arch/nios2/include/asm/mmu.h
index 0485a43..eed4c33 100644
--- a/arch/nios2/include/asm/mmu.h
+++ b/arch/nios2/include/asm/mmu.h
@@ -5,5 +5,15 @@ static inline void remap_range(void *_start, size_t size, uint32_t flags)
 {
 }
 
+static inline uint32_t mmu_get_pte_cached_flags(void)
+{
+	return 0;
+}
+
+static inline uint32_t mmu_get_pte_uncached_flags(void)
+{
+	return 0;
+}
+
 #endif /* __ASM_MMU_H */
 
diff --git a/arch/openrisc/include/asm/mmu.h b/arch/openrisc/include/asm/mmu.h
index 0485a43..eed4c33 100644
--- a/arch/openrisc/include/asm/mmu.h
+++ b/arch/openrisc/include/asm/mmu.h
@@ -5,5 +5,15 @@ static inline void remap_range(void *_start, size_t size, uint32_t flags)
 {
 }
 
+static inline uint32_t mmu_get_pte_cached_flags(void)
+{
+	return 0;
+}
+
+static inline uint32_t mmu_get_pte_uncached_flags(void)
+{
+	return 0;
+}
+
 #endif /* __ASM_MMU_H */
 
diff --git a/arch/ppc/include/asm/mmu.h b/arch/ppc/include/asm/mmu.h
index af263ae..050d84b 100644
--- a/arch/ppc/include/asm/mmu.h
+++ b/arch/ppc/include/asm/mmu.h
@@ -545,4 +545,14 @@ static inline void remap_range(void *_start, size_t size, uint32_t flags)
 {
 }
 
+static inline uint32_t mmu_get_pte_cached_flags(void)
+{
+	return 0;
+}
+
+static inline uint32_t mmu_get_pte_uncached_flags(void)
+{
+	return 0;
+}
+
 #endif /* _PPC_MMU_H_ */
diff --git a/arch/sandbox/include/asm/mmu.h b/arch/sandbox/include/asm/mmu.h
index 0485a43..eed4c33 100644
--- a/arch/sandbox/include/asm/mmu.h
+++ b/arch/sandbox/include/asm/mmu.h
@@ -5,5 +5,15 @@ static inline void remap_range(void *_start, size_t size, uint32_t flags)
 {
 }
 
+static inline uint32_t mmu_get_pte_cached_flags(void)
+{
+	return 0;
+}
+
+static inline uint32_t mmu_get_pte_uncached_flags(void)
+{
+	return 0;
+}
+
 #endif /* __ASM_MMU_H */
 
diff --git a/arch/x86/include/asm/mmu.h b/arch/x86/include/asm/mmu.h
index 0485a43..eed4c33 100644
--- a/arch/x86/include/asm/mmu.h
+++ b/arch/x86/include/asm/mmu.h
@@ -5,5 +5,15 @@ static inline void remap_range(void *_start, size_t size, uint32_t flags)
 {
 }
 
+static inline uint32_t mmu_get_pte_cached_flags(void)
+{
+	return 0;
+}
+
+static inline uint32_t mmu_get_pte_uncached_flags(void)
+{
+	return 0;
+}
+
 #endif /* __ASM_MMU_H */
 
-- 
1.8.1


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