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#ifndef _CPU_H
#define _CPU_H
#include <stdbool.h>
#include <stdint.h>
#include <klibc/compiler.h>
#if __SIZEOF_POINTER__ == 4
#include <i386/cpu.h>
#elif __SIZEOF_POINTER__ == 8
#include <x86_64/cpu.h>
#else
#error "unsupported architecture"
#endif
typedef unsigned long irq_state_t;
static inline irq_state_t irq_state(void)
{
irq_state_t __st;
asm volatile("pushf ; pop %0" : "=rm" (__st) : : "memory");
return __st;
}
static inline irq_state_t irq_save(void)
{
irq_state_t __st = irq_state();
cli();
return __st;
}
static inline void irq_restore(irq_state_t __st)
{
asm volatile("push %0 ; popf" : : "rm" (__st) : "memory");
}
/* Standard macro to see if a specific flag is changeable */
static inline __constfunc bool cpu_has_eflag(unsigned long flag)
{
unsigned long f0, f1;
asm("pushf ; "
"pushf ; "
"pop %0 ; "
"mov %0,%1 ; "
"xor %2,%1 ; "
"push %1 ; "
"popf ; "
"pushf ; "
"pop %1 ; "
"popf"
: "=&r" (f0), "=&r" (f1)
: "ri" (flag));
return !!((f0^f1) & flag);
}
#endif
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