beagleboard: added 2.6.29 kernel from OE

tested on B7 Signed-off-by: Marcin Juszkiewicz <marcin@buglabs.net>
2026-07-16 15:57:04 +00:00 · 2009-04-27 16:41:24 +02:00
parent d65be3dd2a
commit 0adc74b062
146 changed files with 156117 additions and 1 deletions
@@ -0,0 +1,77 @@
+From: Mans Rullgard <mans@mansr.com>
+Date: Sat, 16 Aug 2008 23:03:06 +0000 (+0100)
+Subject: ARM: Workaround for erratum 451034
+X-Git-Url: http://git.mansr.com/?p=linux-omap;a=commitdiff_plain;h=b84fa87873ffb68ad23930cf6cddeea8bec43ede
+
+ARM: Workaround for erratum 451034
+
+On Cortex-A8 r1p0 and r1p1, executing a NEON store with an integer
+store in the store buffer, can cause a processor deadlock under
+certain conditions.
+
+Executing a DMB instruction before saving NEON/VFP registers and before
+return to userspace makes it safe to run code which includes similar
+counter-measures.  Userspace code can still trigger the deadlock, so
+a different workaround is required to safely run untrusted code.
+
+See ARM Cortex-A8 Errata Notice (PR120-PRDC-008070) for full details.
+
+Signed-off-by: Mans Rullgard <mans@mansr.com>
+---
+
+diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
+index aa475d9..41d536e 100644
+--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
+@@ -1117,6 +1117,22 @@ config NEON
+ 	  Say Y to include support code for NEON, the ARMv7 Advanced SIMD
+ 	  Extension.
+ 
+config ARM_ERRATUM_451034
+	bool "Enable workaround for ARM erratum 451034"
+	depends on VFPv3
+	help
+	  On Cortex-A8 r1p0 and r1p1, executing a NEON store with an integer
+	  store in the store buffer, can cause a processor deadlock under
+	  certain conditions.
+
+	  See ARM Cortex-A8 Errata Notice (PR120-PRDC-008070) for full details.
+
+	  Say Y to include a partial workaround.
+
+	  WARNING: Even with this option enabled, userspace code can trigger
+	  the deadlock.	 To safely run untrusted code, a different fix is
+	  required.
+
+ endmenu
+ 
+ menu "Userspace binary formats"
+diff --git a/arch/arm/include/asm/vfpmacros.h b/arch/arm/include/asm/vfpmacros.h
+index 422f3cc..934798b 100644
+--- a/arch/arm/include/asm/vfpmacros.h
+++ b/arch/arm/include/asm/vfpmacros.h
+@@ -32,6 +32,9 @@
+ 
+ 	@ write all the working registers out of the VFP
+ 	.macro	VFPFSTMIA, base, tmp
+#ifdef CONFIG_ARM_ERRATUM_451034
+	dmb
+#endif
+ #if __LINUX_ARM_ARCH__ < 6
+ 	STC	p11, cr0, [\base],#33*4		    @ FSTMIAX \base!, {d0-d15}
+ #else
+diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
+index 060d7e2..9799a35 100644
+--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
+@@ -69,6 +69,10 @@ no_work_pending:
+ 	/* perform architecture specific actions before user return */
+ 	arch_ret_to_user r1, lr
+ 
+#ifdef CONFIG_ARM_ERRATUM_451034
+	dmb
+#endif
+
+ 	@ slow_restore_user_regs
+ 	ldr	r1, [sp, #S_PSR]		@ get calling cpsr
+ 	ldr	lr, [sp, #S_PC]!		@ get pc