WSL2-Linux-Kernel/arch/arm64/include/asm/arch_timer.h

149 строки
3.5 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 <asm/sysreg.h>
#include <linux/bug.h>
#include <linux/init.h>
#include <linux/jump_label.h>
#include <linux/types.h>
#include <clocksource/arm_arch_timer.h>
#if IS_ENABLED(CONFIG_ARM_ARCH_TIMER_OOL_WORKAROUND)
extern struct static_key_false arch_timer_read_ool_enabled;
#define needs_unstable_timer_counter_workaround() \
static_branch_unlikely(&arch_timer_read_ool_enabled)
#else
#define needs_unstable_timer_counter_workaround() false
#endif
struct arch_timer_erratum_workaround {
const char *id; /* Indicate the Erratum ID */
u32 (*read_cntp_tval_el0)(void);
u32 (*read_cntv_tval_el0)(void);
u64 (*read_cntvct_el0)(void);
};
extern const struct arch_timer_erratum_workaround *timer_unstable_counter_workaround;
#define arch_timer_reg_read_stable(reg) \
({ \
u64 _val; \
if (needs_unstable_timer_counter_workaround()) \
_val = timer_unstable_counter_workaround->read_##reg();\
else \
_val = read_sysreg(reg); \
_val; \
})
/*
* These register accessors are marked inline so the compiler can
* nicely work out which register we want, and chuck away the rest of
* the code.
*/
static __always_inline
void arch_timer_reg_write_cp15(int access, enum arch_timer_reg reg, u32 val)
{
if (access == ARCH_TIMER_PHYS_ACCESS) {
switch (reg) {
case ARCH_TIMER_REG_CTRL:
write_sysreg(val, cntp_ctl_el0);
break;
case ARCH_TIMER_REG_TVAL:
write_sysreg(val, cntp_tval_el0);
break;
}
} else if (access == ARCH_TIMER_VIRT_ACCESS) {
switch (reg) {
case ARCH_TIMER_REG_CTRL:
write_sysreg(val, cntv_ctl_el0);
break;
case ARCH_TIMER_REG_TVAL:
write_sysreg(val, cntv_tval_el0);
break;
}
}
isb();
}
static __always_inline
u32 arch_timer_reg_read_cp15(int access, enum arch_timer_reg reg)
{
if (access == ARCH_TIMER_PHYS_ACCESS) {
switch (reg) {
case ARCH_TIMER_REG_CTRL:
return read_sysreg(cntp_ctl_el0);
case ARCH_TIMER_REG_TVAL:
return arch_timer_reg_read_stable(cntp_tval_el0);
}
} else if (access == ARCH_TIMER_VIRT_ACCESS) {
switch (reg) {
case ARCH_TIMER_REG_CTRL:
return read_sysreg(cntv_ctl_el0);
case ARCH_TIMER_REG_TVAL:
return arch_timer_reg_read_stable(cntv_tval_el0);
}
}
BUG();
}
static inline u32 arch_timer_get_cntfrq(void)
{
return read_sysreg(cntfrq_el0);
}
static inline u32 arch_timer_get_cntkctl(void)
{
return read_sysreg(cntkctl_el1);
}
static inline void arch_timer_set_cntkctl(u32 cntkctl)
{
write_sysreg(cntkctl, cntkctl_el1);
}
static inline u64 arch_counter_get_cntpct(void)
{
/*
* AArch64 kernel and user space mandate the use of CNTVCT.
*/
BUG();
return 0;
}
static inline u64 arch_counter_get_cntvct(void)
{
isb();
return arch_timer_reg_read_stable(cntvct_el0);
}
static inline int arch_timer_arch_init(void)
{
return 0;
}
#endif