[fio.git] / arch / arch-ppc.h

#ifndef ARCH_PPC_H
#define ARCH_PPC_H

#include <unistd.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>

#define FIO_ARCH	(arch_ppc)

#ifndef __NR_ioprio_set
#define __NR_ioprio_set		273
#define __NR_ioprio_get		274
#endif

#ifndef __NR_fadvise64
#define __NR_fadvise64		233
#endif

#ifndef __NR_sys_splice
#define __NR_sys_splice		283
#define __NR_sys_tee		284
#define __NR_sys_vmsplice	285
#endif

#define nop	do { } while (0)

#ifdef __powerpc64__
#define read_barrier()	__asm__ __volatile__ ("lwsync" : : : "memory")
#else
#define read_barrier()	__asm__ __volatile__ ("sync" : : : "memory")
#endif

#define write_barrier()	__asm__ __volatile__ ("sync" : : : "memory")

static inline int __ilog2(unsigned long bitmask)
{
	int lz;

	asm ("cntlzw %0,%1" : "=r" (lz) : "r" (bitmask));
	return 31 - lz;
}

static inline int arch_ffz(unsigned long bitmask)
{
	if ((bitmask = ~bitmask) == 0)
		return 32;
	return  __ilog2(bitmask & -bitmask);
}

static inline unsigned int mfspr(unsigned int reg)
{
	unsigned int val;

	asm volatile("mfspr %0,%1": "=r" (val) : "K" (reg));
	return val;
}

#define SPRN_TBRL  0x10C /* Time Base Register Lower */
#define SPRN_TBRU  0x10D /* Time Base Register Upper */
#define SPRN_ATBL  0x20E /* Alternate Time Base Lower */
#define SPRN_ATBU  0x20F /* Alternate Time Base Upper */

static inline unsigned long long get_cpu_clock(void)
{
	unsigned int tbl, tbu0, tbu1;
	unsigned long long ret;

	do {
		if (arch_flags & ARCH_FLAG_1) {
			tbu0 = mfspr(SPRN_ATBU);
			tbl = mfspr(SPRN_ATBL);
			tbu1 = mfspr(SPRN_ATBU);
		} else {
			tbu0 = mfspr(SPRN_TBRU);
			tbl = mfspr(SPRN_TBRL);
			tbu1 = mfspr(SPRN_TBRU);
		}
	} while (tbu0 != tbu1);

	ret = (((unsigned long long)tbu0) << 32) | tbl;
	return ret;
}

static void atb_child(void)
{
	arch_flags |= ARCH_FLAG_1;
	get_cpu_clock();
	_exit(0);
}

static void atb_clocktest(void)
{
	pid_t pid;

	pid = fork();
	if (!pid)
		atb_child();
	else if (pid != -1) {
		int status;

		pid = wait(&status);
		if (pid == -1 || !WIFEXITED(status))
			arch_flags &= ~ARCH_FLAG_1;
		else
			arch_flags |= ARCH_FLAG_1;
	}
}

#define ARCH_HAVE_INIT
extern int tsc_reliable;

static inline int arch_init(char *envp[])
{
#if 0
	tsc_reliable = 1;
	atb_clocktest();
#endif
	return 0;
}

#define ARCH_HAVE_FFZ

/*
 * We don't have it on all platforms, lets comment this out until we
 * can handle it more intelligently.
 *
 * #define ARCH_HAVE_CPU_CLOCK
 */

#endif
Commit	Line	Data
	1	#ifndef ARCH_PPC_H
	2	#define ARCH_PPC_H
	3
	4	#include <unistd.h>
	5	#include <stdlib.h>
	6	#include <sys/types.h>
	7	#include <sys/wait.h>
	8
	9	#define FIO_ARCH (arch_ppc)
	10
	11	#ifndef __NR_ioprio_set
	12	#define __NR_ioprio_set 273
	13	#define __NR_ioprio_get 274
	14	#endif
	15
	16	#ifndef __NR_fadvise64
	17	#define __NR_fadvise64 233
	18	#endif
	19
	20	#ifndef __NR_sys_splice
	21	#define __NR_sys_splice 283
	22	#define __NR_sys_tee 284
	23	#define __NR_sys_vmsplice 285
	24	#endif
	25
	26	#define nop do { } while (0)
	27
	28	#ifdef __powerpc64__
	29	#define read_barrier() __asm__ __volatile__ ("lwsync" : : : "memory")
	30	#else
	31	#define read_barrier() __asm__ __volatile__ ("sync" : : : "memory")
	32	#endif
	33
	34	#define write_barrier() __asm__ __volatile__ ("sync" : : : "memory")
	35
	36	static inline int __ilog2(unsigned long bitmask)
	37	{
	38	int lz;
	39
	40	asm ("cntlzw %0,%1" : "=r" (lz) : "r" (bitmask));
	41	return 31 - lz;
	42	}
	43
	44	static inline int arch_ffz(unsigned long bitmask)
	45	{
	46	if ((bitmask = ~bitmask) == 0)
	47	return 32;
	48	return __ilog2(bitmask & -bitmask);
	49	}
	50
	51	static inline unsigned int mfspr(unsigned int reg)
	52	{
	53	unsigned int val;
	54
	55	asm volatile("mfspr %0,%1": "=r" (val) : "K" (reg));
	56	return val;
	57	}
	58
	59	#define SPRN_TBRL 0x10C /* Time Base Register Lower */
	60	#define SPRN_TBRU 0x10D /* Time Base Register Upper */
	61	#define SPRN_ATBL 0x20E /* Alternate Time Base Lower */
	62	#define SPRN_ATBU 0x20F /* Alternate Time Base Upper */
	63
	64	static inline unsigned long long get_cpu_clock(void)
	65	{
	66	unsigned int tbl, tbu0, tbu1;
	67	unsigned long long ret;
	68
	69	do {
	70	if (arch_flags & ARCH_FLAG_1) {
	71	tbu0 = mfspr(SPRN_ATBU);
	72	tbl = mfspr(SPRN_ATBL);
	73	tbu1 = mfspr(SPRN_ATBU);
	74	} else {
	75	tbu0 = mfspr(SPRN_TBRU);
	76	tbl = mfspr(SPRN_TBRL);
	77	tbu1 = mfspr(SPRN_TBRU);
	78	}
	79	} while (tbu0 != tbu1);
	80
	81	ret = (((unsigned long long)tbu0) << 32) \| tbl;
	82	return ret;
	83	}
	84
	85	static void atb_child(void)
	86	{
	87	arch_flags \|= ARCH_FLAG_1;
	88	get_cpu_clock();
	89	_exit(0);
	90	}
	91
	92	static void atb_clocktest(void)
	93	{
	94	pid_t pid;
	95
	96	pid = fork();
	97	if (!pid)
	98	atb_child();
	99	else if (pid != -1) {
	100	int status;
	101
	102	pid = wait(&status);
	103	if (pid == -1 \|\| !WIFEXITED(status))
	104	arch_flags &= ~ARCH_FLAG_1;
	105	else
	106	arch_flags \|= ARCH_FLAG_1;
	107	}
	108	}
	109
	110	#define ARCH_HAVE_INIT
	111	extern int tsc_reliable;
	112
	113	static inline int arch_init(char *envp[])
	114	{
	115	#if 0
	116	tsc_reliable = 1;
	117	atb_clocktest();
	118	#endif
	119	return 0;
	120	}
	121
	122	#define ARCH_HAVE_FFZ
	123
	124	/*
	125	* We don't have it on all platforms, lets comment this out until we
	126	* can handle it more intelligently.
	127	*
	128	* #define ARCH_HAVE_CPU_CLOCK
	129	*/
	130
	131	#endif