1 files changed, 325 insertions, 0 deletions

diff --git a/arch/arm/mm/proc-macros.S b/arch/arm/mm/proc-macros.S
new file mode 100644
index 00000000..2d8ff3ad
--- /dev/null
+++ b/arch/arm/mm/proc-macros.S
@@ -0,0 +1,325 @@
+/*
+ * We need constants.h for:
+ *  VMA_VM_MM
+ *  VMA_VM_FLAGS
+ *  VM_EXEC
+ */
+#include <asm/asm-offsets.h>
+#include <asm/thread_info.h>
+
+/*
+ * vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
+ */
+	.macro	vma_vm_mm, rd, rn
+	ldr	\rd, [\rn, #VMA_VM_MM]
+	.endm
+
+/*
+ * vma_vm_flags - get vma->vm_flags
+ */
+	.macro	vma_vm_flags, rd, rn
+	ldr	\rd, [\rn, #VMA_VM_FLAGS]
+	.endm
+
+	.macro	tsk_mm, rd, rn
+	ldr	\rd, [\rn, #TI_TASK]
+	ldr	\rd, [\rd, #TSK_ACTIVE_MM]
+	.endm
+
+/*
+ * act_mm - get current->active_mm
+ */
+	.macro	act_mm, rd
+	bic	\rd, sp, #8128
+	bic	\rd, \rd, #63
+	ldr	\rd, [\rd, #TI_TASK]
+	ldr	\rd, [\rd, #TSK_ACTIVE_MM]
+	.endm
+
+/*
+ * mmid - get context id from mm pointer (mm->context.id)
+ */
+	.macro	mmid, rd, rn
+	ldr	\rd, [\rn, #MM_CONTEXT_ID]
+	.endm
+
+/*
+ * mask_asid - mask the ASID from the context ID
+ */
+	.macro	asid, rd, rn
+	and	\rd, \rn, #255
+	.endm
+
+	.macro	crval, clear, mmuset, ucset
+#ifdef CONFIG_MMU
+	.word	\clear
+	.word	\mmuset
+#else
+	.word	\clear
+	.word	\ucset
+#endif
+	.endm
+
+/*
+ * dcache_line_size - get the minimum D-cache line size from the CTR register
+ * on ARMv7.
+ */
+	.macro	dcache_line_size, reg, tmp
+	mrc	p15, 0, \tmp, c0, c0, 1		@ read ctr
+	lsr	\tmp, \tmp, #16
+	and	\tmp, \tmp, #0xf		@ cache line size encoding
+	mov	\reg, #4			@ bytes per word
+	mov	\reg, \reg, lsl \tmp		@ actual cache line size
+	.endm
+
+/*
+ * icache_line_size - get the minimum I-cache line size from the CTR register
+ * on ARMv7.
+ */
+	.macro	icache_line_size, reg, tmp
+	mrc	p15, 0, \tmp, c0, c0, 1		@ read ctr
+	and	\tmp, \tmp, #0xf		@ cache line size encoding
+	mov	\reg, #4			@ bytes per word
+	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 laid out.
+ */
+#ifdef CONFIG_MMU
+#if L_PTE_SHARED != PTE_EXT_SHARED
+#error PTE shared bit mismatch
+#endif
+#if !defined (CONFIG_ARM_LPAE) && \
+	(L_PTE_XN+L_PTE_USER+L_PTE_RDONLY+L_PTE_DIRTY+L_PTE_YOUNG+\
+	 L_PTE_FILE+L_PTE_PRESENT) > L_PTE_SHARED
+#error Invalid Linux PTE bit settings
+#endif
+#endif	/* CONFIG_MMU */
+
+/*
+ * 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
+ *
+ * If !CONFIG_CPU_USE_DOMAINS, the following permissions are changed:
+ *  110x   1   1   1	r/o	r/o
+ *  11x0   1   1   1	r/o	r/o
+ */
+	.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]
+
+	eor	r1, r1, #L_PTE_DIRTY
+	tst	r1, #L_PTE_DIRTY|L_PTE_RDONLY
+	orrne	r3, r3, #PTE_EXT_APX
+
+	tst	r1, #L_PTE_USER
+	orrne	r3, r3, #PTE_EXT_AP1
+#ifdef CONFIG_CPU_USE_DOMAINS
+	@ allow kernel read/write access to read-only user pages
+	tstne	r3, #PTE_EXT_APX
+	bicne	r3, r3, #PTE_EXT_APX | PTE_EXT_AP0
+#endif
+
+	tst	r1, #L_PTE_XN
+	orrne	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_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_RDONLY | 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]			@ linux version
+
+	eor	r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | 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_RDONLY | 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, #2048]!		@ 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
+
+.macro define_processor_functions name:req, dabort:req, pabort:req, nommu=0, suspend=0
+	.type	\name\()_processor_functions, #object
+	.align 2
+ENTRY(\name\()_processor_functions)
+	.word	\dabort
+	.word	\pabort
+	.word	cpu_\name\()_proc_init
+	.word	cpu_\name\()_proc_fin
+	.word	cpu_\name\()_reset
+	.word	cpu_\name\()_do_idle
+	.word	cpu_\name\()_dcache_clean_area
+	.word	cpu_\name\()_switch_mm
+
+	.if \nommu
+	.word	0
+	.else
+	.word	cpu_\name\()_set_pte_ext
+	.endif
+
+	.if \suspend
+	.word	cpu_\name\()_suspend_size
+#ifdef CONFIG_PM_SLEEP
+	.word	cpu_\name\()_do_suspend
+	.word	cpu_\name\()_do_resume
+#else
+	.word	0
+	.word	0
+#endif
+	.else
+	.word	0
+	.word	0
+	.word	0
+	.endif
+
+	.size	\name\()_processor_functions, . - \name\()_processor_functions
+.endm
+
+.macro define_cache_functions name:req
+	.align 2
+	.type	\name\()_cache_fns, #object
+ENTRY(\name\()_cache_fns)
+	.long	\name\()_flush_icache_all
+	.long	\name\()_flush_kern_cache_all
+	.long	\name\()_flush_user_cache_all
+	.long	\name\()_flush_user_cache_range
+	.long	\name\()_coherent_kern_range
+	.long	\name\()_coherent_user_range
+	.long	\name\()_flush_kern_dcache_area
+	.long	\name\()_dma_map_area
+	.long	\name\()_dma_unmap_area
+	.long	\name\()_dma_flush_range
+	.size	\name\()_cache_fns, . - \name\()_cache_fns
+.endm
+
+.macro define_tlb_functions name:req, flags_up:req, flags_smp
+	.type	\name\()_tlb_fns, #object
+ENTRY(\name\()_tlb_fns)
+	.long	\name\()_flush_user_tlb_range
+	.long	\name\()_flush_kern_tlb_range
+	.ifnb \flags_smp
+		ALT_SMP(.long	\flags_smp )
+		ALT_UP(.long	\flags_up )
+	.else
+		.long	\flags_up
+	.endif
+	.size	\name\()_tlb_fns, . - \name\()_tlb_fns
+.endm