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On 162 and up, get the CPU speed from the firmware and only fall back 

to calculating it on the fly if the firmware's value is bogus.

This fixes problems caused by rounding errors on some board/speed
combinations.
This commit is contained in:
scw 2001-06-10 16:48:19 +00:00
parent aab2376d45
commit 8aad61265b
1 changed files with 38 additions and 10 deletions
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48
sys/arch/mvme68k/mvme68k/machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.82 2001/06/02 18:09:16 chs Exp $ */
/* $NetBSD: machdep.c,v 1.83 2001/06/10 16:48:19 scw Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -180,14 +180,11 @@ phys_ram_seg_t mem_clusters[VM_PHYSSEG_MAX];
int mem_cluster_cnt;
/*
* On the 68020/68030, the value of delay_divisor is roughly
* On the 68020/68030 (mvme14x), the value of delay_divisor is roughly
* 8192 / cpuspeed (where cpuspeed is in MHz).
*
* On the 68040, the value of delay_divisor is roughly
* 3072 / cpuspeed (where cpuspeed is in MHz).
*
* On the 68060, the value of delay_divisor is roughly
* 1024 / cpuspeed (where cpuspeed is in MHz).
* On the other boards (mvme162 and up), the cpuspeed is passed
* in from the firmware.
*/
int cpuspeed; /* only used for printing later */
int delay_divisor = 512; /* assume some reasonable value to start */
@ -328,10 +325,13 @@ mvme147_init()
/* calculate cpuspeed */
cpuspeed = 8192 / delay_divisor;
cpuspeed *= 100;
}
#endif /* MVME147 */
#if defined(MVME162) || defined(MVME167) || defined(MVME172) || defined(MVME177)
int get_cpuspeed __P((void));
/*
* MVME-1[67]x specific initializaion.
*/
@ -363,7 +363,33 @@ mvme1xx_init()
bus_space_unmap(bt, bh, PCC2REG_SIZE);
/* calculate cpuspeed */
cpuspeed = ((cputype == CPU_68060) ? 1024 : 3072) / delay_divisor;
cpuspeed = get_cpuspeed();
if (cpuspeed < 1250 || cpuspeed > 6000) {
printf("mvme1xx_init: Warning! Firmware has " \
"bogus CPU speed: `%s'\n", boardid.speed);
cpuspeed = ((cputype == CPU_68060) ? 1000 : 3072) /
delay_divisor;
cpuspeed *= 100;
printf("mvme1xx_init: Approximating speed using "\
"delay_divisor\n");
}
}
/*
* Parse the `speed' field of Bug's boardid structure.
*/
int
get_cpuspeed()
{
int rv, i;
for (i = 0, rv = 0; i < sizeof(boardid.speed); i++) {
if (boardid.speed[i] < '0' || boardid.speed[i] > '9')
return (0);
rv = (rv * 10) + (boardid.speed[i] - '0');
}
return (rv);
}
#endif
@ -685,8 +711,10 @@ identifycpu()
panic("startup");
}
len = sprintf(cpu_model, "Motorola MVME-%s: %dMHz %s", board_str,
cpuspeed, cpu_str);
len = sprintf(cpu_model, "Motorola MVME-%s: %d.%dMHz %s", board_str,
cpuspeed / 100, (cpuspeed % 100) / 10, cpu_str);
cpuspeed /= 100;
if (mmu_str[0] != '\0')
len += sprintf(cpu_model + len, ", %s", mmu_str);