kernel/spinlock.c


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#define FOOLOS_MODULE_NAME "spinlock"
#include "spinlock.h"

#include "kernel.h"

#include "asm/x86.h"

// https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html

static volatile uint32_t spinlocks[NUMBER_SPINLOCKS];

void check_spinlocks()
{
    log(FOOLOS_MODULE_NAME,5,"Spinlocks at 0x%08X ",spinlocks);
    for(int i=0;i<NUMBER_SPINLOCKS;i++)
    log(FOOLOS_MODULE_NAME,5,"%d",spinlocks[i]);
}

/*
void lock_spin(uint32_t i)
{
    uint32_t *addr=spinlocks+i;
    while(x86_xchg(addr,1));
}
*/

void lock_release(uint32_t i)
{
    uint32_t *addr=spinlocks+i;
    asm("movb $0,%0"::"m"(*addr));
}