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kernel: locks: add spin lock/unlock function that don't change interrupt state

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This commit is contained in:
max 🍓
2026-02-23 18:24:49 +00:00
parent b2d04c5983
commit fe107fbad3
4 changed files with 53 additions and 9 deletions
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2
arch/user/hwlock.c
View File

@@ -1,5 +1,5 @@
#include <kernel/machine/hwlock.h>
#include <kernel/compiler.h>
#include <kernel/machine/hwlock.h>
void ml_hwlock_lock(ml_hwlock_t *lck)
{

43
arch/x86_64/hwlock.S
View File

@@ -11,6 +11,41 @@ ml_hwlock_lock:
mov $1, %ecx
mfence
1: mov $0, %eax
lock cmpxchg %ecx, (%rdi)
jne 1b
pop %rbp
ret
.global ml_hwlock_unlock
.type ml_hwlock_unlock, @function
/* %rdi = pointer to ml_hwlock_t (int) */
ml_hwlock_unlock:
push %rbp
mov %rsp, %rbp
movl $0, (%rdi)
mfence
pop %rbp
ret
.global ml_hwlock_lock_irq
.type ml_hwlock_lock_irq, @function
/* %rdi = pointer to ml_hwlock_t (int) */
ml_hwlock_lock_irq:
push %rbp
mov %rsp, %rbp
mov $1, %ecx
cli
mfence
@@ -21,11 +56,12 @@ ml_hwlock_lock:
pop %rbp
ret
.global ml_hwlock_unlock
.type ml_hwlock_unlock, @function
.global ml_hwlock_unlock_irq
.type ml_hwlock_unlock_irq, @function
/* %rdi = pointer to ml_hwlock_t (int) */
ml_hwlock_unlock:
ml_hwlock_unlock_irq:
push %rbp
mov %rsp, %rbp
@@ -62,6 +98,7 @@ ml_hwlock_lock_irqsave:
pop %rbp
ret
.global ml_hwlock_unlock_irqrestore
.type ml_hwlock_unlock_irqrestore, @function

3
arch/x86_64/include/kernel/machine/hwlock.h
View File

@@ -12,6 +12,9 @@ typedef int ml_hwlock_t;
extern void ml_hwlock_lock(ml_hwlock_t *lck);
extern void ml_hwlock_unlock(ml_hwlock_t *lck);
extern void ml_hwlock_lock_irq(ml_hwlock_t *lck);
extern void ml_hwlock_unlock_irq(ml_hwlock_t *lck);
extern void ml_hwlock_lock_irqsave(ml_hwlock_t *lck, unsigned long *flags);
extern void ml_hwlock_unlock_irqrestore(ml_hwlock_t *lck, unsigned long flags);

12
include/kernel/locks.h
View File

@@ -10,13 +10,17 @@ extern "C" {
typedef __aligned(8) ml_hwlock_t spin_lock_t;
#define SPIN_LOCK_INIT ML_HWLOCK_INIT
#define SPIN_LOCK_INIT ML_HWLOCK_INIT
#define spin_lock(lck) ml_hwlock_lock(lck);
#define spin_unlock(lck) ml_hwlock_unlock(lck);
#define spin_lock(lck) ml_hwlock_lock(lck);
#define spin_unlock(lck) ml_hwlock_unlock(lck);
#define spin_lock_irq(lck) ml_hwlock_lock_irq(lck);
#define spin_unlock_irq(lck) ml_hwlock_unlock_irq(lck);
#define spin_lock_irqsave(lck, flags) ml_hwlock_lock_irqsave(lck, flags);
#define spin_unlock_irqrestore(lck, flags) ml_hwlock_unlock_irqrestore(lck, flags);
#define spin_unlock_irqrestore(lck, flags) \
ml_hwlock_unlock_irqrestore(lck, flags);
#ifdef __cplusplus
}