https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 568035b01cfb107af8d2e4bd2fb9aea22cf5b868 authored by Linus Torvalds on 14 August 2022, 22:50:18 UTC
Linux 6.0-rc1
Linux 6.0-rc1
Tip revision: 568035b
thumbee.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* arch/arm/kernel/thumbee.c
*
* Copyright (C) 2008 ARM Limited
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <asm/cputype.h>
#include <asm/system_info.h>
#include <asm/thread_notify.h>
/*
* Access to the ThumbEE Handler Base register
*/
static inline unsigned long teehbr_read(void)
{
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:
teehbr_write(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;
pfr0 = read_cpuid_ext(CPUID_EXT_PFR0);
if ((pfr0 & 0x0000f000) != 0x00001000)
return 0;
pr_info("ThumbEE CPU extension supported.\n");
elf_hwcap |= HWCAP_THUMBEE;
thread_register_notifier(&thumbee_notifier_block);
return 0;
}
late_initcall(thumbee_init);