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Set the fsb timer correctly for Netburst CPUs 

On Netburst (Pentium 4) the fsb cannot be read from
MSR_FSB_FREQ (msr 0xcd). One has to use msr 0x2c instead.

Change-Id: I0beccba2e4a8ec5cd23537b2207f9c49a040fd73
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/17832
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
This commit is contained in:
Arthur Heymans 2016-12-13 15:21:24 +01:00 committed by Martin Roth
parent 98915bb7a9
commit f3018f9def
1 changed files with 38 additions and 22 deletions
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38
src/cpu/x86/lapic/apic_timer.c
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@ -47,32 +47,48 @@ static int set_timer_fsb(void)
struct cpuinfo_x86 c;
int core_fsb[8] = { -1, 133, -1, 166, -1, 100, -1, -1 };
int core2_fsb[8] = { 266, 133, 200, 166, 333, 100, -1, -1 };
int f2x_fsb[8] = { 100, 133, 200, 166, -1, -1, -1, -1 };
get_fms(&c, cpuid_eax(1));
if (c.x86 != 6)
return -1;
switch (c.x86) {
case 0x6:
switch (c.x86_model) {
case 0xe: /* Core Solo/Duo */
case 0x1c: /* Atom */
car_set_var(g_timer_fsb, core_fsb[rdmsr(MSR_FSB_FREQ).lo & 7]);
break;
car_set_var(g_timer_fsb,
core_fsb[rdmsr(MSR_FSB_FREQ).lo & 7]);
return 0;
case 0xf: /* Core 2 or Xeon */
case 0x17: /* Enhanced Core */
car_set_var(g_timer_fsb, core2_fsb[rdmsr(MSR_FSB_FREQ).lo & 7]);
break;
car_set_var(g_timer_fsb,
core2_fsb[rdmsr(MSR_FSB_FREQ).lo & 7]);
return 0;
case 0x2a: /* SandyBridge BCLK fixed at 100MHz*/
case 0x3a: /* IvyBridge BCLK fixed at 100MHz*/
case 0x3c: /* Haswell BCLK fixed at 100MHz */
case 0x45: /* Haswell-ULT BCLK fixed at 100MHz */
car_set_var(g_timer_fsb, 100);
break;
return 0;
default:
car_set_var(g_timer_fsb, 200);
break;
}
return 0;
}
case 0xf: /* Netburst */
switch (c.x86_model) {
case 0x2:
car_set_var(g_timer_fsb,
f2x_fsb[(rdmsr(0x2c).lo >> 16) & 7]);
return 0;
case 0x3:
case 0x4:
case 0x6:
car_set_var(g_timer_fsb,
core2_fsb[(rdmsr(0x2c).lo >> 16) & 7]);
return 0;
} /* default: fallthrough */
default:
return -1;
}
}
static inline u32 get_timer_fsb(void)