ARMv7: Add support for the ThumbEE state saving/restoring (d7f864be) · Commits · e / devices / android_kernel_teracube_emerald

arch/arm/kernel/Makefile

+1 −0

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		@@ -22,6 +22,7 @@ obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o
		obj-$(CONFIG_KPROBES) += kprobes.o kprobes-decode.o
		obj-$(CONFIG_ATAGS_PROC) += atags.o
		obj-$(CONFIG_OABI_COMPAT) += sys_oabi-compat.o
		obj-$(CONFIG_ARM_THUMBEE) += thumbee.o

		obj-$(CONFIG_CRUNCH) += crunch.o crunch-bits.o
		AFLAGS_crunch-bits.o := -Wa,-mcpu=ep9312

arch/arm/kernel/asm-offsets.c

+3 −0

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		@@ -58,6 +58,9 @@ int main(void)
		DEFINE(TI_TP_VALUE, offsetof(struct thread_info, tp_value));
		DEFINE(TI_FPSTATE, offsetof(struct thread_info, fpstate));
		DEFINE(TI_VFPSTATE, offsetof(struct thread_info, vfpstate));
		#ifdef CONFIG_ARM_THUMBEE
		DEFINE(TI_THUMBEE_STATE, offsetof(struct thread_info, thumbee_state));
		#endif
		#ifdef CONFIG_IWMMXT
		DEFINE(TI_IWMMXT_STATE, offsetof(struct thread_info, fpstate.iwmmxt));
		#endif

arch/arm/kernel/thumbee.c

0 → 100644

+81 −0

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		/*
		* arch/arm/kernel/thumbee.c
		*
		* Copyright (C) 2008 ARM Limited
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*
		* You should have received a copy of the GNU General Public License
		* along with this program; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		*/

		#include <linux/kernel.h>
		#include <linux/init.h>

		#include <asm/thread_notify.h>

		/*
		* Access to the ThumbEE Handler Base register
		*/
		static inline unsigned long teehbr_read()
		{
		unsigned long v;
		asm("mrc p14, 6, %0, c1, c0, 0\n" : "=r" (v));
		return v;
		}

		static inline void teehbr_write(unsigned long v)
		{
		asm("mcr p14, 6, %0, c1, c0, 0\n" : : "r" (v));
		}

		static int thumbee_notifier(struct notifier_block self, unsigned long cmd, void t)
		{
		struct thread_info *thread = t;

		switch (cmd) {
		case THREAD_NOTIFY_FLUSH:
		thread->thumbee_state = 0;
		break;
		case THREAD_NOTIFY_SWITCH:
		current_thread_info()->thumbee_state = teehbr_read();
		teehbr_write(thread->thumbee_state);
		break;
		}

		return NOTIFY_DONE;
		}

		static struct notifier_block thumbee_notifier_block = {
		.notifier_call = thumbee_notifier,
		};

		static int __init thumbee_init(void)
		{
		unsigned long pfr0;
		unsigned int cpu_arch = cpu_architecture();

		if (cpu_arch < CPU_ARCH_ARMv7)
		return 0;

		/* processor feature register 0 */
		asm("mrc p15, 0, %0, c0, c1, 0\n" : "=r" (pfr0));
		if ((pfr0 & 0x0000f000) != 0x00001000)
		return 0;

		printk(KERN_INFO "ThumbEE CPU extension supported.\n");
		elf_hwcap \|= HWCAP_THUMBEE;
		thread_register_notifier(&thumbee_notifier_block);

		return 0;
		}

		late_initcall(thumbee_init);

arch/arm/mm/Kconfig

+7 −0

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		@@ -572,6 +572,13 @@ config ARM_THUMB

		If you don't know what this all is, saying Y is a safe choice.

		config ARM_THUMBEE
		bool "Enable ThumbEE CPU extension"
		depends on CPU_V7
		help
		Say Y here if you have a CPU with the ThumbEE extension and code to
		make use of it. Say N for code that can run on CPUs without ThumbEE.

		config CPU_BIG_ENDIAN
		bool "Build big-endian kernel"
		depends on ARCH_SUPPORTS_BIG_ENDIAN

include/asm-arm/hwcap.h

+1 −0

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		@@ -15,6 +15,7 @@
		#define HWCAP_JAVA 256
		#define HWCAP_IWMMXT 512
		#define HWCAP_CRUNCH 1024
		#define HWCAP_THUMBEE 2048

		#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
		/*