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#ifndef __RTL_ARCH_TIME_H__
#define __RTL_ARCH_TIME_H__
/*
* rtl_time.h
*
* x86 hardware clock interface
*
* Copyright (C) 1999 Michael Barabanov
* Released under the terms of the GPL
*
*/
/* begin of what each arch should declare */
typedef long long hrtime_t; /* high-resolution time type (signed 64-bit) */
extern inline hrtime_t timespec_to_ns (const struct timespec *ts)
{
long long t;
__asm__("imull %%edx\n"
"add %%ebx, %%eax\n\t"
"adc $0, %%edx\n\t"
:"=A" (t)
: "a" (ts->tv_sec), "d" (NSECS_PER_SEC), "b" (ts->tv_nsec)
);
return t;
}
extern inline struct timespec timespec_from_ns (hrtime_t t)
{
struct timespec ts;
__asm__("idivl %%ecx\n\t"
:"=a" (ts.tv_sec), "=d" (ts.tv_nsec)
: "A" (t), "c" (NSECS_PER_SEC)
);
if (ts.tv_nsec < 0) {
ts.tv_nsec += NSECS_PER_SEC;
ts.tv_sec --;
}
return ts;
}
#ifdef __KERNEL__
#include <linux/time.h>
#include <rtl_core.h>
#include <asm/ptrace.h>
extern inline hrtime_t hrt_to_8254 (hrtime_t t)
{
__asm__("mov %%eax, %%ecx\n\t"
"mov %%edx, %%eax\n\t"
"xorl %%edx, %%edx\n\t"
"idivl %%ebx\n\t"
"xchg %%eax, %%ecx\n\t"
"divl %%ebx\n\t"
"mov %%ecx, %%edx\n\t"
:"=A" (t) :"0" (t), "b" (838)
:"cx");
return t;
}
extern inline hrtime_t _8254_to_hrt (hrtime_t t)
{
__asm__(
"mov %%eax, %%ecx\n\t"
"mov %%edx, %%eax\n\t"
"mul %%ebx\n\t"
"xchg %%eax, %%ecx\n\t"
"mul %%ebx\n\t"
"add %%ecx, %%edx\n\t"
:"=A" (t) : "b" (838), "0" (t): "cx");
return t;
}
#define HRT_FROM_8254(x) (_8254_to_hrt(x))
#define HRT_TO_8254(x) (hrt_to_8254(x))
extern hrtime_t gethrtime(void); /* time in nanoseconds since bootup */
extern hrtime_t gethrtimeres(void); /* resolution of gethrtime() in ns */
struct rtl_clock_arch {
int istimerset;
int count_irqs;
int apic_cpu;
hrtime_t linux_time;
};
#define RTL_CLOCK_ARCH_INITIALIZER { 0, 0, 0, 0 }
/* end of public arch declarations */
extern struct rtl_clock _i8254_clock __attribute__ ((aligned (64)));
#define CLOCK_8254 (&_i8254_clock)
#ifdef CONFIG_X86_LOCAL_APIC
extern struct rtl_clock _apic_clock[NR_CPUS] __attribute__ ((aligned (64)));
#define CLOCK_APIC (&_apic_clock[rtl_getcpuid()])
#endif
/* TODO
extern clockid_t CLOCK_RTC;
*/
#include <linux/delay.h>
extern __inline__ unsigned long muldiv(unsigned long a, unsigned long mul, unsigned long div)
{
int temp;
__asm__("mull %2 ; divl %3"
:"=a" (a), "=d" (temp)
:"1" (mul),
"c" (div),
"0" (a)
);
return a;
}
static inline void rtl_delay(long delay)
{
hrtime_t t = gethrtime() + delay;
while (gethrtime() < t);
}
extern int I8253_channel2_free(void);
#endif
#endif
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