diff options
Diffstat (limited to 'meta/recipes-kernel/linux/linux-omap2-git/beagleboard/no-cortex-deadlock.patch')
| -rw-r--r-- | meta/recipes-kernel/linux/linux-omap2-git/beagleboard/no-cortex-deadlock.patch | 75 |
1 files changed, 0 insertions, 75 deletions
diff --git a/meta/recipes-kernel/linux/linux-omap2-git/beagleboard/no-cortex-deadlock.patch b/meta/recipes-kernel/linux/linux-omap2-git/beagleboard/no-cortex-deadlock.patch deleted file mode 100644 index 32ec4c2d3..000000000 --- a/meta/recipes-kernel/linux/linux-omap2-git/beagleboard/no-cortex-deadlock.patch +++ /dev/null @@ -1,75 +0,0 @@ -From: Mans Rullgard <mans@mansr.com> -Date: Wed, 30 Jul 2008 08:25:51 +0000 (+0100) -Subject: ARM: NEON L1 cache bug workaround (erratum 451034) -X-Git-Url: http://git.mansr.com/?p=linux-omap;a=commitdiff_plain;h=26023493baf13e0a67fd6cf08d87be5ff6f7c56d - -ARM: NEON L1 cache bug workaround (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. ---- - -diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig -index 8c75840..1172e14 100644 ---- a/arch/arm/Kconfig -+++ b/arch/arm/Kconfig -@@ -1071,6 +1071,22 @@ config NEON - Say Y to include support code for NEON, the ARMv7 Advanced SIMD - Extension. - -+config NEON_CACHE_BUG -+ bool "NEON L1 cache bug workaround (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 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/kernel/entry-common.S b/arch/arm/kernel/entry-common.S -index 597ed00..e50094e 100644 ---- a/arch/arm/kernel/entry-common.S -+++ b/arch/arm/kernel/entry-common.S -@@ -68,6 +68,10 @@ no_work_pending: - /* perform architecture specific actions before user return */ - arch_ret_to_user r1, lr - -+#ifdef CONFIG_NEON_CACHE_BUG -+ dmb -+#endif -+ - @ slow_restore_user_regs - ldr r1, [sp, #S_PSR] @ get calling cpsr - ldr lr, [sp, #S_PC]! @ get pc -diff --git a/include/asm-arm/vfpmacros.h b/include/asm-arm/vfpmacros.h -index cccb389..c9d2976 100644 ---- a/include/asm-arm/vfpmacros.h -+++ b/include/asm-arm/vfpmacros.h -@@ -32,6 +32,9 @@ - - @ write all the working registers out of the VFP - .macro VFPFSTMIA, base, tmp -+#ifdef CONFIG_NEON_CACHE_BUG -+ dmb -+#endif - #if __LINUX_ARM_ARCH__ < 6 - STC p11, cr0, [\base],#33*4 @ FSTMIAX \base!, {d0-d15} - #else |