From d675d0bc47f28c5414fbbe17fcc801f69c45b960 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Tue, 22 Nov 2011 17:30:28 +0000 Subject: [PATCH] ARM: LPAE: add ISBs around MMU enabling code Before we enable the MMU, we must ensure that the TTBR registers contain sane values. After the MMU has been enabled, we jump to the *virtual* address of the following function, so we also need to ensure that the SCTLR write has taken effect. This patch adds ISB instructions around the SCTLR write to ensure the visibility of the above. Signed-off-by: Will Deacon Signed-off-by: Catalin Marinas --- arch/arm/boot/compressed/head.S | 1 + arch/arm/include/asm/assembler.h | 11 +++++++++++ arch/arm/kernel/head.S | 2 ++ arch/arm/kernel/sleep.S | 2 ++ 4 files changed, 16 insertions(+) diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S index c2effc9..c5d6025 100644 --- a/arch/arm/boot/compressed/head.S +++ b/arch/arm/boot/compressed/head.S @@ -659,6 +659,7 @@ __armv7_mmu_cache_on: mcrne p15, 0, r3, c2, c0, 0 @ load page table pointer mcrne p15, 0, r1, c3, c0, 0 @ load domain access control #endif + mcr p15, 0, r0, c7, c5, 4 @ ISB mcr p15, 0, r0, c1, c0, 0 @ load control register mrc p15, 0, r0, c1, c0, 0 @ and read it back mov r0, #0 diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h index 29035e8..b6e65de 100644 --- a/arch/arm/include/asm/assembler.h +++ b/arch/arm/include/asm/assembler.h @@ -187,6 +187,17 @@ #endif /* + * Instruction barrier + */ + .macro instr_sync +#if __LINUX_ARM_ARCH__ >= 7 + isb +#elif __LINUX_ARM_ARCH__ == 6 + mcr p15, 0, r0, c7, c5, 4 +#endif + .endm + +/* * SMP data memory barrier */ .macro smp_dmb mode diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S index 64e9943..54eb94a 100644 --- a/arch/arm/kernel/head.S +++ b/arch/arm/kernel/head.S @@ -401,8 +401,10 @@ ENDPROC(__enable_mmu) .pushsection .idmap.text, "ax" ENTRY(__turn_mmu_on) mov r0, r0 + instr_sync mcr p15, 0, r0, c1, c0, 0 @ write control reg mrc p15, 0, r3, c0, c0, 0 @ read id reg + instr_sync mov r3, r3 mov r3, r13 mov pc, r3 diff --git a/arch/arm/kernel/sleep.S b/arch/arm/kernel/sleep.S index 9e64231..1f268bd 100644 --- a/arch/arm/kernel/sleep.S +++ b/arch/arm/kernel/sleep.S @@ -57,8 +57,10 @@ ENDPROC(cpu_suspend_abort) .pushsection .idmap.text,"ax" ENTRY(cpu_resume_mmu) ldr r3, =cpu_resume_after_mmu + instr_sync mcr p15, 0, r0, c1, c0, 0 @ turn on MMU, I-cache, etc mrc p15, 0, r0, c0, c0, 0 @ read id reg + instr_sync mov r0, r0 mov r0, r0 mov pc, r3 @ jump to virtual address -- 2.7.4