From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/arm/mm/tlb-v7.S | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 95 insertions(+)
 create mode 100644 arch/arm/mm/tlb-v7.S

(limited to 'arch/arm/mm/tlb-v7.S')

diff --git a/arch/arm/mm/tlb-v7.S b/arch/arm/mm/tlb-v7.S
new file mode 100644
index 000000000..e5101a3bc
--- /dev/null
+++ b/arch/arm/mm/tlb-v7.S
@@ -0,0 +1,95 @@
+/*
+ *  linux/arch/arm/mm/tlb-v7.S
+ *
+ *  Copyright (C) 1997-2002 Russell King
+ *  Modified for ARMv7 by Catalin Marinas
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  ARM architecture version 6 TLB handling functions.
+ *  These assume a split I/D TLB.
+ */
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+#include <asm/asm-offsets.h>
+#include <asm/page.h>
+#include <asm/tlbflush.h>
+#include "proc-macros.S"
+
+/*
+ *	v7wbi_flush_user_tlb_range(start, end, vma)
+ *
+ *	Invalidate a range of TLB entries in the specified address space.
+ *
+ *	- start - start address (may not be aligned)
+ *	- end   - end address (exclusive, may not be aligned)
+ *	- vma   - vma_struct describing address range
+ *
+ *	It is assumed that:
+ *	- the "Invalidate single entry" instruction will invalidate
+ *	  both the I and the D TLBs on Harvard-style TLBs
+ */
+ENTRY(v7wbi_flush_user_tlb_range)
+	vma_vm_mm r3, r2			@ get vma->vm_mm
+	mmid	r3, r3				@ get vm_mm->context.id
+	dsb	ish
+	mov	r0, r0, lsr #PAGE_SHIFT		@ align address
+	mov	r1, r1, lsr #PAGE_SHIFT
+	asid	r3, r3				@ mask ASID
+#ifdef CONFIG_ARM_ERRATA_720789
+	ALT_SMP(W(mov)	r3, #0	)
+	ALT_UP(W(nop)		)
+#endif
+	orr	r0, r3, r0, lsl #PAGE_SHIFT	@ Create initial MVA
+	mov	r1, r1, lsl #PAGE_SHIFT
+1:
+#ifdef CONFIG_ARM_ERRATA_720789
+	ALT_SMP(mcr	p15, 0, r0, c8, c3, 3)	@ TLB invalidate U MVA all ASID (shareable)
+#else
+	ALT_SMP(mcr	p15, 0, r0, c8, c3, 1)	@ TLB invalidate U MVA (shareable)
+#endif
+	ALT_UP(mcr	p15, 0, r0, c8, c7, 1)	@ TLB invalidate U MVA
+
+	add	r0, r0, #PAGE_SZ
+	cmp	r0, r1
+	blo	1b
+	dsb	ish
+	ret	lr
+ENDPROC(v7wbi_flush_user_tlb_range)
+
+/*
+ *	v7wbi_flush_kern_tlb_range(start,end)
+ *
+ *	Invalidate a range of kernel TLB entries
+ *
+ *	- start - start address (may not be aligned)
+ *	- end   - end address (exclusive, may not be aligned)
+ */
+ENTRY(v7wbi_flush_kern_tlb_range)
+	dsb	ish
+	mov	r0, r0, lsr #PAGE_SHIFT		@ align address
+	mov	r1, r1, lsr #PAGE_SHIFT
+	mov	r0, r0, lsl #PAGE_SHIFT
+	mov	r1, r1, lsl #PAGE_SHIFT
+1:
+#ifdef CONFIG_ARM_ERRATA_720789
+	ALT_SMP(mcr	p15, 0, r0, c8, c3, 3)	@ TLB invalidate U MVA all ASID (shareable)
+#else
+	ALT_SMP(mcr	p15, 0, r0, c8, c3, 1)	@ TLB invalidate U MVA (shareable)
+#endif
+	ALT_UP(mcr	p15, 0, r0, c8, c7, 1)	@ TLB invalidate U MVA
+	add	r0, r0, #PAGE_SZ
+	cmp	r0, r1
+	blo	1b
+	dsb	ish
+	isb
+	ret	lr
+ENDPROC(v7wbi_flush_kern_tlb_range)
+
+	__INIT
+
+	/* define struct cpu_tlb_fns (see <asm/tlbflush.h> and proc-macros.S) */
+	define_tlb_functions v7wbi, v7wbi_tlb_flags_up, flags_smp=v7wbi_tlb_flags_smp
-- 
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