spinlock.c File Reference

#include <miniOS/arch/x86_64/spinlock.h>

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Functions
static uint16_t	atomic_xadd_u16 (volatile uint16_t *ptr, uint16_t val)
static void	atomic_inc_u8_low (volatile uint16_t *ptr)
static void	save_flags_and_cli (unsigned long *flags)
static void	restore_flags (unsigned long flags)
void	spinlock_lock (spinlock_t *lock)
void	spinlock_unlock (spinlock_t *lock)
void	spinlock_irqsave (spinlock_t *lock, unsigned long *flags)
void	spinlock_irqrestore (spinlock_t *lock, unsigned long flags)
void	spinlock_irq (spinlock_t *lock)
void	spinlock_irq_unlock (spinlock_t *lock)

Function Documentation

atomic_inc_u8_low()

void atomic_inc_u8_low ( volatile uint16_t * ptr )

inlinestatic

atomic_inc_u8_low — atomically increment low byte of *ptr (owner field). Must NOT use incw: incw increments the full 16-bit value, so when the owner byte overflows 0xFF→0x00 the carry corrupts the next-ticket byte. incb on the low byte increments only bits [7:0] without carry.

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atomic_xadd_u16()

uint16_t atomic_xadd_u16 ( volatile uint16_t * ptr, uint16_t val )

inlinestatic

atomic_xadd_u16 — atomically: tmp = *ptr; *ptr += val; return tmp

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restore_flags()

void restore_flags ( unsigned long flags )

inlinestatic

restore_flags — push saved value onto stack, popf restores RFLAGS.IF

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save_flags_and_cli()

void save_flags_and_cli ( unsigned long * flags )

inlinestatic

save_flags_and_cli — push RFLAGS to *flags, then cli

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