X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=arch%2Farch-ppc.h;h=0cc0cbda7d69890e10ff41816d836b4189684963;hp=4839122e9328688a486aaff57b83ddcbcfbbafa5;hb=3ba1ba7f3d0fde62817e3e0c2aa284759de96ec8;hpb=69ebbd397e80b23ec4281c99e9f7242a089cc771

diff --git a/arch/arch-ppc.h b/arch/arch-ppc.h
index 4839122e..0cc0cbda 100644
--- a/arch/arch-ppc.h
+++ b/arch/arch-ppc.h
@@ -1,7 +1,12 @@
 #ifndef ARCH_PPC_H
 #define ARCH_PPH_H
 
-#define ARCH	(arch_ppc)
+#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
@@ -42,40 +47,77 @@ static inline int arch_ffz(unsigned long bitmask)
 		return 32;
 	return  __ilog2(bitmask & -bitmask);
 }
-#define ARCH_HAVE_FFZ
 
-typedef struct {
-	volatile unsigned int lock;
-} spinlock_t;
+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 void spin_trylock(spinlock_t *lock)
+static inline unsigned long long get_cpu_clock(void)
 {
-	unsigned long tmp;
-
-	__asm__ __volatile__(
-		"1:     lwarx           %0,0,%2\n\
-		cmpwi           0,%0,0\n\
-		bne-            2f\n\
-		stwcx.          1,0,%2\n\
-		bne-            1b\n\
-		isync\n\
-		2:"     : "=&r" (tmp)
-		: (&lock->lock)
-		: "cr0", "memory");
-
-	return tmp;
+	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 {
+			__asm__ __volatile__("mftbu %0" : "=r"(tbu0));
+			__asm__ __volatile__("mftb %0"  : "=r"(tbl) );
+			__asm__ __volatile__("mftbu %0" : "=r"(tbu1));
+		}
+	} while (tbu0 != tbu1);
+
+	ret = (((unsigned long long)tbu0) << 32) | tbl;
+	return ret;
 }
 
-static inline void spin_lock(spinlock_t *lock)
+static void atb_child(void)
 {
-	while (spin_trylock(lock))
-		;
+	arch_flags |= ARCH_FLAG_1;
+	get_cpu_clock();
+	_exit(0);
 }
 
-static inline void spin_unlock(spinlock_t *lock)
+static void atb_clocktest(void)
 {
-	read_barrier();
-	lock->lock = 0;
+	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[])
+{
+	tsc_reliable = 1;
+	atb_clocktest();
+	return 0;
+}
+
+#define ARCH_HAVE_FFZ
+#define ARCH_HAVE_CPU_CLOCK
+
 #endif