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armv7-a/armv7-r/armv8-r: percpu reg store this_task

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This is continue work of https://github.com/apache/nuttx/pull/13726

We can utilize percpu storage to hold information about the
current running task. If we intend to implement this feature, we would
need to define two macros that help us manage this percpu information
effectively.

up_this_task: This macro is designed to read the contents of the percpu
register to retrieve information about the current
running task.This allows us to quickly access
task-specific data without having to disable interrupts,
access global variables and obtain the current cpu index.

up_update_task: This macro is responsible for updating the contents of
the percpu register.It is typically called during
initialization or when a context switch occurs to ensure
that the percpu register reflects the information of the
newly running task.

Signed-off-by: hujun5 <hujun5@xiaomi.com>
This commit is contained in:
hujun5 2024-12-05 16:58:17 +08:00 committed by Xiang Xiao
parent 344968b8c2
commit 1e49cb4828
8 changed files with 39 additions and 21 deletions
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2
arch/arm/include/armv7-a/cp15.h
View file

@ -275,4 +275,6 @@
value; \
}) \
#define CP15_MODIFY(v,m,a) CP15_SET(a, ((CP15_GET(a) & ~(m)) | ((uintptr_t)(v) & (m))))
#endif /* __ARCH_ARM_SRC_ARMV7_A_CP15_H */

12
arch/arm/include/armv7-a/irq.h
View file

@ -472,18 +472,16 @@ static inline_function uint32_t up_getsp(void)
return sp;
}
noinstrument_function
static inline_function bool up_interrupt_context(void)
{
return (bool)CP15_GET(TPIDRPRW);
}
noinstrument_function
static inline_function void up_set_interrupt_context(bool flag)
{
CP15_SET(TPIDRPRW, flag);
CP15_MODIFY(flag, 1ul, TPIDRPRW);
}
#define up_this_task() ((struct tcb_s *)(CP15_GET(TPIDRPRW) & ~1ul))
#define up_update_task(t) CP15_MODIFY(t, ~1ul, TPIDRPRW)
#define up_interrupt_context() (CP15_GET(TPIDRPRW) & 1)
/****************************************************************************
* Public Data
****************************************************************************/

2
arch/arm/include/armv7-r/cp15.h
View file

@ -218,4 +218,6 @@
value; \
}) \
#define CP15_MODIFY(v,m,a) CP15_SET(a, ((CP15_GET(a) & ~(m)) | ((uintptr_t)(v) & (m))))
#endif /* __ARCH_ARM_SRC_ARMV7_R_CP15_H */

12
arch/arm/include/armv7-r/irq.h
View file

@ -467,18 +467,16 @@ static inline_function uint32_t up_getsp(void)
return sp;
}
noinstrument_function
static inline_function bool up_interrupt_context(void)
{
return (bool)CP15_GET(TPIDRPRW);
}
noinstrument_function
static inline_function void up_set_interrupt_context(bool flag)
{
CP15_SET(TPIDRPRW, flag);
CP15_MODIFY(flag, 1ul, TPIDRPRW);
}
#define up_this_task() ((struct tcb_s *)(CP15_GET(TPIDRPRW) & ~1ul))
#define up_update_task(t) CP15_MODIFY(t, ~1ul, TPIDRPRW)
#define up_interrupt_context() (CP15_GET(TPIDRPRW) & 1)
/****************************************************************************
* Public Data
****************************************************************************/

2
arch/arm/include/armv8-r/cp15.h
View file

@ -237,4 +237,6 @@
_value; \
}) \
#define CP15_MODIFY(v,m,a) CP15_SET(a, ((CP15_GET(a) & ~(m)) | ((uintptr_t)(v) & (m))))
#endif /* __ARCH_ARM_SRC_ARMV8_R_CP15_H */

12
arch/arm/include/armv8-r/irq.h
View file

@ -467,18 +467,16 @@ static inline_function uint32_t up_getsp(void)
return sp;
}
noinstrument_function
static inline_function bool up_interrupt_context(void)
{
return (bool)CP15_GET(TPIDRPRW);
}
noinstrument_function
static inline_function void up_set_interrupt_context(bool flag)
{
CP15_SET(TPIDRPRW, flag);
CP15_MODIFY(flag, 1ul, TPIDRPRW);
}
#define up_this_task() ((struct tcb_s *)(CP15_GET(TPIDRPRW) & ~1ul))
#define up_update_task(t) CP15_MODIFY(t, ~1ul, TPIDRPRW)
#define up_interrupt_context() (CP15_GET(TPIDRPRW) & 1)
/****************************************************************************
* Public Data
****************************************************************************/

9
arch/arm/src/armv7-a/arm_scu.c
View file

@ -29,6 +29,7 @@
#include <stdint.h>
#include <arch/irq.h>
#include <sched/sched.h>
#include "arm_internal.h"
#include "cp15_cacheops.h"
@ -57,6 +58,14 @@ void arm_enable_smp(int cpu)
{
uint32_t regval;
/* We need to confirm that current_task has been initialized. */
while (!current_task(this_cpu()));
/* Init idle task to percpu reg */
up_update_task(current_task(cpu));
/* Handle actions unique to CPU0 which comes up first */
if (cpu == 0)

9
arch/arm/src/armv7-r/arm_scu.c
View file

@ -29,6 +29,7 @@
#include <stdint.h>
#include <arch/irq.h>
#include <sched/sched.h>
#include "arm_internal.h"
#include "cp15_cacheops.h"
@ -57,6 +58,14 @@ void arm_enable_smp(int cpu)
{
uint32_t regval;
/* We need to confirm that current_task has been initialized. */
while (!current_task(this_cpu()));
/* Init idle task to percpu reg */
up_update_task(current_task(cpu));
/* Handle actions unique to CPU0 which comes up first */
if (cpu == 0)