mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 10:06:48 +07:00
58834eecde
The ThumbEE probe code uses inline assembly to read ID_PFR0 in order to detect whether ThumbEE is implemented by the processor. This patch replaces the inline asm with the read_cpuid_ext macro. Reviewed-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Jonathan Austin <jonathan.austin@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/*
|
|
* 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/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:
|
|
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;
|
|
|
|
pfr0 = read_cpuid_ext(CPUID_EXT_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);
|