[ARM] 4394/1: ARMv7: Add the TLB range operations

We are currently using the ARMv6 operations but need to duplicate some
of the code because of the introduction of the new CPU barrier
instructions in ARMv7.

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 5f472a8..e7904bc 100644 (file)
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -379,7 +379,7 @@ config CPU_V7
        select CPU_CP15_MMU
        select CPU_HAS_ASID
        select CPU_COPY_V6 if MMU
-       select CPU_TLB_V6 if MMU
+       select CPU_TLB_V7 if MMU
 
 # Figure out what processor architecture version we should be using.
 # This defines the compiler instruction set which depends on the machine type.
@@ -498,6 +498,9 @@ config CPU_TLB_V4WBI
 config CPU_TLB_V6
        bool
 
+config CPU_TLB_V7
+       bool
+
 endif
 
 config CPU_HAS_ASID

diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile
index b5bd335..7627027 100644 (file)
--- a/arch/arm/mm/Makefile
+++ b/arch/arm/mm/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_CPU_TLB_V4WT)    += tlb-v4.o
 obj-$(CONFIG_CPU_TLB_V4WB)     += tlb-v4wb.o
 obj-$(CONFIG_CPU_TLB_V4WBI)    += tlb-v4wbi.o
 obj-$(CONFIG_CPU_TLB_V6)       += tlb-v6.o
+obj-$(CONFIG_CPU_TLB_V7)       += tlb-v7.o
 
 obj-$(CONFIG_CPU_ARM610)       += proc-arm6_7.o
 obj-$(CONFIG_CPU_ARM710)       += proc-arm6_7.o

diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
index dd823dd..718f478 100644 (file)
--- a/arch/arm/mm/proc-v7.S
+++ b/arch/arm/mm/proc-v7.S
@@ -256,7 +256,7 @@ __v7_proc_info:
        .long   HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
        .long   cpu_v7_name
        .long   v7_processor_functions
-       .long   v6wbi_tlb_fns
+       .long   v7wbi_tlb_fns
        .long   v6_user_fns
        .long   v7_cache_fns
        .size   __v7_proc_info, . - __v7_proc_info

diff --git a/arch/arm/mm/tlb-v7.S b/arch/arm/mm/tlb-v7.S
new file mode 100644 (file)
index 0000000..b56dda8
--- /dev/null
+++ b/arch/arm/mm/tlb-v7.S
@@ -0,0 +1,88 @@
+/*
+ *  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/linkage.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
+       mov     r0, r0, lsr #PAGE_SHIFT         @ align address
+       mov     r1, r1, lsr #PAGE_SHIFT
+       asid    r3, r3                          @ mask ASID
+       orr     r0, r3, r0, lsl #PAGE_SHIFT     @ Create initial MVA
+       mov     r1, r1, lsl #PAGE_SHIFT
+       vma_vm_flags r2, r2                     @ get vma->vm_flags
+1:
+       mcr     p15, 0, r0, c8, c6, 1           @ TLB invalidate D MVA (was 1)
+       tst     r2, #VM_EXEC                    @ Executable area ?
+       mcrne   p15, 0, r0, c8, c5, 1           @ TLB invalidate I MVA (was 1)
+       add     r0, r0, #PAGE_SZ
+       cmp     r0, r1
+       blo     1b
+       mov     ip, #0
+       mcr     p15, 0, ip, c7, c5, 6           @ flush BTAC/BTB
+       dsb
+       mov     pc, lr
+
+/*
+ *     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
+       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:
+       mcr     p15, 0, r0, c8, c6, 1           @ TLB invalidate D MVA
+       mcr     p15, 0, r0, c8, c5, 1           @ TLB invalidate I MVA
+       add     r0, r0, #PAGE_SZ
+       cmp     r0, r1
+       blo     1b
+       mov     r2, #0
+       mcr     p15, 0, r2, c7, c5, 6           @ flush BTAC/BTB
+       dsb
+       isb
+       mov     pc, lr
+
+       .section ".text.init", #alloc, #execinstr
+
+       .type   v7wbi_tlb_fns, #object
+ENTRY(v7wbi_tlb_fns)
+       .long   v7wbi_flush_user_tlb_range
+       .long   v7wbi_flush_kern_tlb_range
+       .long   v6wbi_tlb_flags
+       .size   v7wbi_tlb_fns, . - v7wbi_tlb_fns

diff --git a/include/asm-arm/tlbflush.h b/include/asm-arm/tlbflush.h
index ccd0de0..71be4fd 100644 (file)
--- a/include/asm-arm/tlbflush.h
+++ b/include/asm-arm/tlbflush.h
@@ -138,6 +138,19 @@
 # define v6wbi_always_flags    (-1UL)
 #endif
 
+#ifdef CONFIG_CPU_TLB_V7
+# define v7wbi_possible_flags  v6wbi_tlb_flags
+# define v7wbi_always_flags    v6wbi_tlb_flags
+# ifdef _TLB
+#  define MULTI_TLB 1
+# else
+#  define _TLB v7wbi
+# endif
+#else
+# define v7wbi_possible_flags  0
+# define v7wbi_always_flags    (-1UL)
+#endif
+
 #ifndef _TLB
 #error Unknown TLB model
 #endif