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-rw-r--r--arch/arm/mm/proc-macros.S170
1 files changed, 170 insertions, 0 deletions
diff --git a/arch/arm/mm/proc-macros.S b/arch/arm/mm/proc-macros.S
index b131500..54b1f72 100644
--- a/arch/arm/mm/proc-macros.S
+++ b/arch/arm/mm/proc-macros.S
@@ -71,3 +71,173 @@
mov \reg, #16 @ size offset
mov \reg, \reg, lsl \tmp @ actual cache line size
.endm
+
+
+/*
+ * Sanity check the PTE configuration for the code below - which makes
+ * certain assumptions about how these bits are layed out.
+ */
+#if L_PTE_SHARED != PTE_EXT_SHARED
+#error PTE shared bit mismatch
+#endif
+#if L_PTE_BUFFERABLE != PTE_BUFFERABLE
+#error PTE bufferable bit mismatch
+#endif
+#if L_PTE_CACHEABLE != PTE_CACHEABLE
+#error PTE cacheable bit mismatch
+#endif
+#if (L_PTE_EXEC+L_PTE_USER+L_PTE_WRITE+L_PTE_DIRTY+L_PTE_YOUNG+\
+ L_PTE_FILE+L_PTE_PRESENT) > L_PTE_SHARED
+#error Invalid Linux PTE bit settings
+#endif
+
+/*
+ * The ARMv6 and ARMv7 set_pte_ext translation function.
+ *
+ * Permission translation:
+ * YUWD APX AP1 AP0 SVC User
+ * 0xxx 0 0 0 no acc no acc
+ * 100x 1 0 1 r/o no acc
+ * 10x0 1 0 1 r/o no acc
+ * 1011 0 0 1 r/w no acc
+ * 110x 0 1 0 r/w r/o
+ * 11x0 0 1 0 r/w r/o
+ * 1111 0 1 1 r/w r/w
+ */
+ .macro armv6_mt_table pfx
+\pfx\()_mt_table:
+ .long 0x00 @ L_PTE_MT_UNCACHED
+ .long PTE_EXT_TEX(1) @ L_PTE_MT_BUFFERABLE
+ .long PTE_CACHEABLE @ L_PTE_MT_WRITETHROUGH
+ .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEBACK
+ .long PTE_BUFFERABLE @ L_PTE_MT_DEV_SHARED
+ .long 0x00 @ unused
+ .long 0x00 @ L_PTE_MT_MINICACHE (not present)
+ .long PTE_EXT_TEX(1) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEALLOC
+ .long 0x00 @ unused
+ .long PTE_EXT_TEX(1) @ L_PTE_MT_DEV_WC
+ .long 0x00 @ unused
+ .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_DEV_CACHED
+ .long PTE_EXT_TEX(2) @ L_PTE_MT_DEV_NONSHARED
+ .long 0x00 @ unused
+ .long 0x00 @ unused
+ .long 0x00 @ unused
+ .endm
+
+ .macro armv6_set_pte_ext pfx
+ str r1, [r0], #-2048 @ linux version
+
+ bic r3, r1, #0x000003fc
+ bic r3, r3, #PTE_TYPE_MASK
+ orr r3, r3, r2
+ orr r3, r3, #PTE_EXT_AP0 | 2
+
+ adr ip, \pfx\()_mt_table
+ and r2, r1, #L_PTE_MT_MASK
+ ldr r2, [ip, r2]
+
+ tst r1, #L_PTE_WRITE
+ tstne r1, #L_PTE_DIRTY
+ orreq r3, r3, #PTE_EXT_APX
+
+ tst r1, #L_PTE_USER
+ orrne r3, r3, #PTE_EXT_AP1
+ tstne r3, #PTE_EXT_APX
+ bicne r3, r3, #PTE_EXT_APX | PTE_EXT_AP0
+
+ tst r1, #L_PTE_EXEC
+ orreq r3, r3, #PTE_EXT_XN
+
+ orr r3, r3, r2
+
+ tst r1, #L_PTE_YOUNG
+ tstne r1, #L_PTE_PRESENT
+ moveq r3, #0
+
+ str r3, [r0]
+ mcr p15, 0, r0, c7, c10, 1 @ flush_pte
+ .endm
+
+
+/*
+ * The ARMv3, ARMv4 and ARMv5 set_pte_ext translation function,
+ * covering most CPUs except Xscale and Xscale 3.
+ *
+ * Permission translation:
+ * YUWD AP SVC User
+ * 0xxx 0x00 no acc no acc
+ * 100x 0x00 r/o no acc
+ * 10x0 0x00 r/o no acc
+ * 1011 0x55 r/w no acc
+ * 110x 0xaa r/w r/o
+ * 11x0 0xaa r/w r/o
+ * 1111 0xff r/w r/w
+ */
+ .macro armv3_set_pte_ext wc_disable=1
+ str r1, [r0], #-2048 @ linux version
+
+ eor r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
+
+ bic r2, r1, #PTE_SMALL_AP_MASK @ keep C, B bits
+ bic r2, r2, #PTE_TYPE_MASK
+ orr r2, r2, #PTE_TYPE_SMALL
+
+ tst r3, #L_PTE_USER @ user?
+ orrne r2, r2, #PTE_SMALL_AP_URO_SRW
+
+ tst r3, #L_PTE_WRITE | L_PTE_DIRTY @ write and dirty?
+ orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
+
+ tst r3, #L_PTE_PRESENT | L_PTE_YOUNG @ present and young?
+ movne r2, #0
+
+ .if \wc_disable
+#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
+ tst r2, #PTE_CACHEABLE
+ bicne r2, r2, #PTE_BUFFERABLE
+#endif
+ .endif
+ str r2, [r0] @ hardware version
+ .endm
+
+
+/*
+ * Xscale set_pte_ext translation, split into two halves to cope
+ * with work-arounds. r3 must be preserved by code between these
+ * two macros.
+ *
+ * Permission translation:
+ * YUWD AP SVC User
+ * 0xxx 00 no acc no acc
+ * 100x 00 r/o no acc
+ * 10x0 00 r/o no acc
+ * 1011 01 r/w no acc
+ * 110x 10 r/w r/o
+ * 11x0 10 r/w r/o
+ * 1111 11 r/w r/w
+ */
+ .macro xscale_set_pte_ext_prologue
+ str r1, [r0], #-2048 @ linux version
+
+ eor r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_WRITE | L_PTE_DIRTY
+
+ bic r2, r1, #PTE_SMALL_AP_MASK @ keep C, B bits
+ orr r2, r2, #PTE_TYPE_EXT @ extended page
+
+ tst r3, #L_PTE_USER @ user?
+ orrne r2, r2, #PTE_EXT_AP_URO_SRW @ yes -> user r/o, system r/w
+
+ tst r3, #L_PTE_WRITE | L_PTE_DIRTY @ write and dirty?
+ orreq r2, r2, #PTE_EXT_AP_UNO_SRW @ yes -> user n/a, system r/w
+ @ combined with user -> user r/w
+ .endm
+
+ .macro xscale_set_pte_ext_epilogue
+ tst r3, #L_PTE_PRESENT | L_PTE_YOUNG @ present and young?
+ movne r2, #0 @ no -> fault
+
+ str r2, [r0] @ hardware version
+ mov ip, #0
+ mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
+ mcr p15, 0, ip, c7, c10, 4 @ data write barrier
+ .endm
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