From: ben.dooks@codethink.co.uk (Ben Dooks)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 4/9] ARM: set BE8 if LE in head code
Date: Wed, 13 Feb 2013 10:55:22 +0000 [thread overview]
Message-ID: <1360752927-29331-5-git-send-email-ben.dooks@codethink.co.uk> (raw)
In-Reply-To: <1360752927-29331-1-git-send-email-ben.dooks@codethink.co.uk>
If we are booting in LE and compiled for BE8, then add code to
set the state to bE8. Since the instruction stream is always LE,
we do not need to do anything special to the instruction.
Also ensure that the secondary processors are started in the same mode.
Note, we do add about 20 bytes to the kernel image, but it seems easier
to do this than adding another configuration to change.
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
---
arch/arm/boot/compressed/head.S | 1 +
arch/arm/kernel/head.S | 4 ++++
arch/arm/mm/proc-v7.S | 1 +
3 files changed, 6 insertions(+)
diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
index 15ebdd6..06b0f15 100644
--- a/arch/arm/boot/compressed/head.S
+++ b/arch/arm/boot/compressed/head.S
@@ -134,6 +134,7 @@ start:
.word _edata @ zImage end address
THUMB( .thumb )
1:
+ ARM_BE8( setend be ) @ go BE8 if LE, no-op if BE8
mrs r9, cpsr
#ifdef CONFIG_ARM_VIRT_EXT
bl __hyp_stub_install @ get into SVC mode, reversibly
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index cc15384..a112994 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S
@@ -77,6 +77,7 @@
__HEAD
ENTRY(stext)
+ ARM_BE8(setend be ) @ ensure we are in BE8 mode
THUMB( adr r9, BSYM(1f) ) @ Kernel is always entered in ARM.
THUMB( bx r9 ) @ If this is a Thumb-2 kernel,
@@ -333,6 +334,9 @@ ENTRY(secondary_startup)
* the processor type - there is no need to check the machine type
* as it has already been validated by the primary processor.
*/
+
+ ARM_BE8(setend be) @ if system starts LE, go BE8
+
#ifdef CONFIG_ARM_VIRT_EXT
bl __hyp_stub_install_secondary
#endif
diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
index d17996b..28bb018 100644
--- a/arch/arm/mm/proc-v7.S
+++ b/arch/arm/mm/proc-v7.S
@@ -109,6 +109,7 @@ ENTRY(cpu_v7_do_suspend)
ENDPROC(cpu_v7_do_suspend)
ENTRY(cpu_v7_do_resume)
+ ARM_BE8(setend be ) @ ensure we are BE8
mov ip, #0
mcr p15, 0, ip, c8, c7, 0 @ invalidate TLBs
mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
--
1.7.10.4
next prev parent reply other threads:[~2013-02-13 10:55 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-13 10:55 [RFC v3] Better BE support for ARM Ben Dooks
2013-02-13 10:55 ` [PATCH 1/9] ARM: fix ARCH_IXP4xx usage of ARCH_SUPPORTS_BIG_ENDIAN Ben Dooks
2013-02-18 19:58 ` Krzysztof Halasa
2013-02-13 10:55 ` [PATCH 2/9] ARM: fixup_pv_table bug when CPU_ENDIAN_BE8 Ben Dooks
2013-02-19 12:04 ` Dave Martin
2013-02-13 10:55 ` [PATCH 3/9] ARM: asm: Add ARM_BE8() assembly helper Ben Dooks
2013-02-14 4:27 ` Nicolas Pitre
2013-02-19 12:07 ` Dave Martin
2013-02-13 10:55 ` Ben Dooks [this message]
2013-02-14 4:33 ` [PATCH 4/9] ARM: set BE8 if LE in head code Nicolas Pitre
2013-02-13 10:55 ` [PATCH 5/9] ARM: pl01x debug code endian fix Ben Dooks
2013-02-19 12:27 ` Dave Martin
2013-02-13 10:55 ` [PATCH 6/9] ARM: twd: data " Ben Dooks
2013-02-13 10:55 ` [PATCH 7/9] ARM: smp_scu: data endian fixes Ben Dooks
2013-02-13 10:55 ` [PATCH 8/9] highbank: enable big-endian Ben Dooks
2013-02-13 10:55 ` [PATCH 9/9] mvebu: support running big-endian Ben Dooks
2013-02-15 11:39 ` [RFC v3] Better BE support for ARM Ben Dooks
2013-02-19 12:00 ` Dave Martin
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