From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 2/9] ARM: proc: add definition of cpu_reset for ARMv6 and ARMv7 cores
Date: Wed, 15 Jun 2011 18:23:13 +0100 [thread overview]
Message-ID: <1308158600-7169-3-git-send-email-will.deacon@arm.com> (raw)
In-Reply-To: <1308158600-7169-1-git-send-email-will.deacon@arm.com>
This patch adds simple definitions of cpu_reset for ARMv6 and ARMv7
cores, which disable the MMU via the SCTLR.
Signed-off-by: Will Deacon <will.deacon@arm.com>
---
arch/arm/mm/proc-v6.S | 5 +++++
arch/arm/mm/proc-v7.S | 7 +++++++
2 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mm/proc-v6.S b/arch/arm/mm/proc-v6.S
index 1d2b845..f3b5232 100644
--- a/arch/arm/mm/proc-v6.S
+++ b/arch/arm/mm/proc-v6.S
@@ -56,6 +56,11 @@ ENTRY(cpu_v6_proc_fin)
*/
.align 5
ENTRY(cpu_v6_reset)
+ mrc p15, 0, r1, c1, c0, 0 @ ctrl register
+ bic r1, r1, #0x1 @ ...............m
+ mcr p15, 0, r1, c1, c0, 0 @ disable MMU
+ mov r1, #0
+ mcr p15, 0, r1, c7, c5, 4 @ ISB
mov pc, r0
/*
diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
index b3b566e..776443a 100644
--- a/arch/arm/mm/proc-v7.S
+++ b/arch/arm/mm/proc-v7.S
@@ -58,9 +58,16 @@ ENDPROC(cpu_v7_proc_fin)
* to what would be the reset vector.
*
* - loc - location to jump to for soft reset
+ *
+ * This code must be executed using a flat identity mapping with
+ * caches disabled.
*/
.align 5
ENTRY(cpu_v7_reset)
+ mrc p15, 0, r1, c1, c0, 0 @ ctrl register
+ bic r1, r1, #0x1 @ ...............m
+ mcr p15, 0, r1, c1, c0, 0 @ disable MMU
+ isb
mov pc, r0
ENDPROC(cpu_v7_reset)
--
1.7.0.4
next prev parent reply other threads:[~2011-06-15 17:23 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-15 17:23 [PATCH v3 0/9] MMU disabling code and kexec fixes Will Deacon
2011-06-15 17:23 ` [PATCH v3 1/9] ARM: l2x0: fix disabling function to avoid deadlock Will Deacon
2011-06-16 14:53 ` Catalin Marinas
2011-06-15 17:23 ` Will Deacon [this message]
2011-06-15 17:23 ` [PATCH v3 3/9] ARM: lib: add switch_stack function for safely changing stack Will Deacon
2011-06-15 17:23 ` [PATCH v3 4/9] ARM: idmap: add header file for identity mapping functions Will Deacon
2011-06-15 17:23 ` [PATCH v3 5/9] ARM: reset: allow kernelspace mappings to be flat mapped during reset Will Deacon
2011-06-15 17:23 ` [PATCH v3 6/9] ARM: multi-cpu: remove arguments from CPU proc macros Will Deacon
2011-06-15 17:23 ` [PATCH v3 7/9] ARM: reset: add reset functionality for jumping to a physical address Will Deacon
2011-06-15 17:23 ` [PATCH v3 8/9] ARM: kexec: use arm_machine_reset for branching to the reboot buffer Will Deacon
2011-06-15 17:23 ` [PATCH v3 9/9] ARM: stop: execute platform callback from cpu_stop code Will Deacon
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