mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-25 20:14:25 +08:00
b8c6453aaf
The __cpuinit type of throwaway sections might have made sense
some time ago when RAM was more constrained, but now the savings
do not offset the cost and complications. For example, the fix in
commit 5e427ec2d0 ("x86: Fix bit corruption at CPU resume time")
is a good example of the nasty type of bugs that can be created
with improper use of the various __init prefixes.
After a discussion on LKML[1] it was decided that cpuinit should go
the way of devinit and be phased out. Once all the users are gone,
we can then finally remove the macros themselves from linux/init.h.
Note that some harmless section mismatch warnings may result, since
notify_cpu_starting() and cpu_up() are arch independent (kernel/cpu.c)
are flagged as __cpuinit -- so if we remove the __cpuinit from
arch specific callers, we will also get section mismatch warnings.
As an intermediate step, we intend to turn the linux/init.h cpuinit
content into no-ops as early as possible, since that will get rid
of these warnings. In any case, they are temporary and harmless.
This removes all the arch/arm64 uses of the __cpuinit macros from
all C files. Currently arm64 does not have any __CPUINIT used in
assembly files.
[1] https://lkml.org/lkml/2013/5/20/589
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
129 lines
2.9 KiB
C
129 lines
2.9 KiB
C
/*
|
|
* arch/arm64/include/asm/arch_timer.h
|
|
*
|
|
* Copyright (C) 2012 ARM Ltd.
|
|
* Author: Marc Zyngier <marc.zyngier@arm.com>
|
|
*
|
|
* 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, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#ifndef __ASM_ARCH_TIMER_H
|
|
#define __ASM_ARCH_TIMER_H
|
|
|
|
#include <asm/barrier.h>
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <clocksource/arm_arch_timer.h>
|
|
|
|
static inline void arch_timer_reg_write(int access, int reg, u32 val)
|
|
{
|
|
if (access == ARCH_TIMER_PHYS_ACCESS) {
|
|
switch (reg) {
|
|
case ARCH_TIMER_REG_CTRL:
|
|
asm volatile("msr cntp_ctl_el0, %0" : : "r" (val));
|
|
break;
|
|
case ARCH_TIMER_REG_TVAL:
|
|
asm volatile("msr cntp_tval_el0, %0" : : "r" (val));
|
|
break;
|
|
default:
|
|
BUILD_BUG();
|
|
}
|
|
} else if (access == ARCH_TIMER_VIRT_ACCESS) {
|
|
switch (reg) {
|
|
case ARCH_TIMER_REG_CTRL:
|
|
asm volatile("msr cntv_ctl_el0, %0" : : "r" (val));
|
|
break;
|
|
case ARCH_TIMER_REG_TVAL:
|
|
asm volatile("msr cntv_tval_el0, %0" : : "r" (val));
|
|
break;
|
|
default:
|
|
BUILD_BUG();
|
|
}
|
|
} else {
|
|
BUILD_BUG();
|
|
}
|
|
|
|
isb();
|
|
}
|
|
|
|
static inline u32 arch_timer_reg_read(int access, int reg)
|
|
{
|
|
u32 val;
|
|
|
|
if (access == ARCH_TIMER_PHYS_ACCESS) {
|
|
switch (reg) {
|
|
case ARCH_TIMER_REG_CTRL:
|
|
asm volatile("mrs %0, cntp_ctl_el0" : "=r" (val));
|
|
break;
|
|
case ARCH_TIMER_REG_TVAL:
|
|
asm volatile("mrs %0, cntp_tval_el0" : "=r" (val));
|
|
break;
|
|
default:
|
|
BUILD_BUG();
|
|
}
|
|
} else if (access == ARCH_TIMER_VIRT_ACCESS) {
|
|
switch (reg) {
|
|
case ARCH_TIMER_REG_CTRL:
|
|
asm volatile("mrs %0, cntv_ctl_el0" : "=r" (val));
|
|
break;
|
|
case ARCH_TIMER_REG_TVAL:
|
|
asm volatile("mrs %0, cntv_tval_el0" : "=r" (val));
|
|
break;
|
|
default:
|
|
BUILD_BUG();
|
|
}
|
|
} else {
|
|
BUILD_BUG();
|
|
}
|
|
|
|
return val;
|
|
}
|
|
|
|
static inline u32 arch_timer_get_cntfrq(void)
|
|
{
|
|
u32 val;
|
|
asm volatile("mrs %0, cntfrq_el0" : "=r" (val));
|
|
return val;
|
|
}
|
|
|
|
static inline void arch_counter_set_user_access(void)
|
|
{
|
|
u32 cntkctl;
|
|
|
|
/* Disable user access to the timers and the physical counter. */
|
|
asm volatile("mrs %0, cntkctl_el1" : "=r" (cntkctl));
|
|
cntkctl &= ~((3 << 8) | (1 << 0));
|
|
|
|
/* Enable user access to the virtual counter and frequency. */
|
|
cntkctl |= (1 << 1);
|
|
asm volatile("msr cntkctl_el1, %0" : : "r" (cntkctl));
|
|
}
|
|
|
|
static inline u64 arch_counter_get_cntvct(void)
|
|
{
|
|
u64 cval;
|
|
|
|
isb();
|
|
asm volatile("mrs %0, cntvct_el0" : "=r" (cval));
|
|
|
|
return cval;
|
|
}
|
|
|
|
static inline int arch_timer_arch_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif
|