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Fix bug in L2 cache size detection code for CPU which supports CPUID

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function 8000_0006h.

Tested on: Pentum-M 750
This commit is contained in:
David Xu 2006-02-02 11:54:40 +00:00
parent 92cb1c3210
commit ec4275eefa
1 changed files with 8 additions and 3 deletions
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11
sys/i386/i386/identcpu.c
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@ -1443,6 +1443,7 @@ setPQL2_INTEL(int *const size, int *const ways)
{
u_int rounds, regnum;
u_int regs[4];
u_int nwaycode;
do_cpuid(0x2, regs);
rounds = (regs[0] & 0xff) - 1;
@ -1483,9 +1484,13 @@ setPQL2_INTEL(int *const size, int *const ways)
if (cpu_exthigh >= 0x80000006) {
do_cpuid(0x80000006, regs);
if (*size < (regs[2] & 0xffff)) {
*size = regs[2] & 0xffff;
*ways = (regs[2] >> 16) & 0xff;
if (*size < ((regs[2] >> 16) & 0xffff)) {
*size = (regs[2] >> 16) & 0xffff;
nwaycode = (regs[2] >> 12) & 0x0f;
if (nwaycode >= 0x02 && nwaycode <= 0x08)
*ways = 1 << (nwaycode / 2);
else
*ways = 0;
}
}
}