diff options
Diffstat (limited to 'recipes/linux/linux-omap-psp-2.6.32/0039-ARM-Add-option-to-allow-userspace-PLE-access.patch')
| -rw-r--r-- | recipes/linux/linux-omap-psp-2.6.32/0039-ARM-Add-option-to-allow-userspace-PLE-access.patch | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/recipes/linux/linux-omap-psp-2.6.32/0039-ARM-Add-option-to-allow-userspace-PLE-access.patch b/recipes/linux/linux-omap-psp-2.6.32/0039-ARM-Add-option-to-allow-userspace-PLE-access.patch new file mode 100644 index 0000000000..a3af530ab8 --- /dev/null +++ b/recipes/linux/linux-omap-psp-2.6.32/0039-ARM-Add-option-to-allow-userspace-PLE-access.patch @@ -0,0 +1,48 @@ +From 85392359bd3a2002b72d65d1637598c2f1e398b3 Mon Sep 17 00:00:00 2001 +From: Mans Rullgard <mans@mansr.com> +Date: Tue, 10 Nov 2009 00:41:54 +0000 +Subject: [PATCH 39/42] ARM: Add option to allow userspace PLE access + +This adds a Kconfig option to allow userspace to access the L2 preload +engine (PLE) found in Cortex-A8. + +Signed-off-by: Mans Rullgard <mans@mansr.com> +--- + arch/arm/kernel/head.S | 4 ++++ + arch/arm/mm/Kconfig | 8 ++++++++ + 2 files changed, 12 insertions(+), 0 deletions(-) + +diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S +index eb62bf9..659ec9e 100644 +--- a/arch/arm/kernel/head.S ++++ b/arch/arm/kernel/head.S +@@ -172,6 +172,10 @@ __enable_mmu: + #ifdef CONFIG_CPU_ICACHE_DISABLE + bic r0, r0, #CR_I + #endif ++#ifdef CONFIG_USER_L2_PLE ++ mov r5, #3 ++ mcr p15, 0, r5, c11, c1, 0 ++#endif + mov r5, #(domain_val(DOMAIN_USER, DOMAIN_MANAGER) | \ + domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) | \ + domain_val(DOMAIN_TABLE, DOMAIN_MANAGER) | \ +diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig +index dd4698c..564ff7d 100644 +--- a/arch/arm/mm/Kconfig ++++ b/arch/arm/mm/Kconfig +@@ -785,3 +785,11 @@ config ARM_L1_CACHE_SHIFT + int + default 6 if ARCH_OMAP3 || ARCH_S5PC1XX + default 5 ++ ++config USER_L2_PLE ++ bool "Enable userspace access to the L2 PLE" ++ depends on CPU_V7 ++ default n ++ help ++ Enable userspace access to the L2 preload engine (PLE) available ++ in Cortex-A series ARM processors. +-- +1.6.6.1 + |