Messages in this thread |  | | Date | Thu, 14 Dec 2000 14:10:57 +0000 (GMT) | From | John Levon <> | Subject | x86 cpu_data |
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Hi, I need to check for *only* Intel P6 processors, so no Classic Pentium, and no Pentium 4. setup.c is a bit obscure; is this check correct :
if (current_cpu_data.x86_vendor != X86_VENDOR_INTEL || current_cpu_data.x86 != 6) return NOT_P6; if (current_cpu_data.x86_model > 5) return PENTIUM_III; if (current_cpu_data.x86_model > 2) return PENTIUM_II; return PENTIUM_PRO;
??
(I need this check as I make use of the P6 performance counters).
Also, I found a weird bit of code in setup.c (2.4.0test12) :
1567 case 4: 1568 if ( c->x86 > 6 && dl ) { 1569 /* P4 family */ 1570 if ( dl ) { 1571 /* L3 cache */ 1572 cs = 128 << (dl-1); 1573 l3 += cs; 1574 break; 1575 } 1576 } 1577 /* else same as 8 - fall through */ 1578 case 8: 1579 if ( dl ) {
in particular, the check on line 1570 seems redundant, or a typo.
thanks john
-- "Kaa's Law: In any sufficiently large group of people most are idiots." "Adams' Corollary: "sufficiently large" is around 1."
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