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If we have a working cycle counter, compute the number of CPU 

cycles in a second, and print the CPU speed.

Derived from similar code in FreeBSD.
This commit is contained in:
thorpej 2000-11-05 22:10:01 +00:00
parent 88cd122ef4
commit fa03f6e74d
1 changed files with 25 additions and 2 deletions
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27
sys/arch/i386/i386/machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.407 2000/10/28 02:29:35 enami Exp $ */
/* $NetBSD: machdep.c,v 1.408 2000/11/05 22:10:01 thorpej Exp $ */
/*-
* Copyright (c) 1996, 1997, 1998, 2000 The NetBSD Foundation, Inc.
@ -219,6 +219,11 @@ extern paddr_t avail_start, avail_end;
phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX];
int mem_cluster_cnt;
/*
* The number of CPU cycles in one second.
*/
u_int64_t cpu_tsc_freq;
int cpu_dump __P((void));
int cpu_dumpsize __P((void));
u_long cpu_dump_mempagecnt __P((void));
@ -329,7 +334,11 @@ cpu_startup()
printf("%s", version);
printf("cpu0: %s\n", cpu_model);
printf("cpu0: %s", cpu_model);
if (cpu_tsc_freq != 0)
printf(", %qd.%02qd MHz", (cpu_tsc_freq + 4999) / 1000000,
((cpu_tsc_freq + 4999) / 10000) % 100);
printf("\n");
if (cpu_icache_info != NULL || cpu_dcache_info != NULL) {
printf("cpu0:");
if (cpu_icache_info)
@ -1027,6 +1036,20 @@ identifycpu()
if (cpu_class >= CPUCLASS_486)
lcr0(rcr0() | CR0_WP);
#endif
#if defined(I586_CPU) || defined(I686_CPU)
/*
* If we have a cycle counter, compute the approximate
* CPU speed in MHz.
*/
if (cpu_feature & CPUID_TSC) {
u_int64_t last_tsc;
last_tsc = rdtsc();
delay(1000000);
cpu_tsc_freq = rdtsc() - last_tsc;
}
#endif
}
/*