Date: Mon, 02 Jan 2006 20:03:47 +0100 From: Alexander Leidinger <Alexander@Leidinger.net> To: Divacky Roman <xdivac02@stud.fit.vutbr.cz> Cc: current@freebsd.org Subject: Re: AMD cache values for page colouring Message-ID: <20060102200347.2bumr7okkkgossww@netchild.homeip.net> In-Reply-To: <20060102101653.GA65178@stud.fit.vutbr.cz> References: <20060102101653.GA65178@stud.fit.vutbr.cz>
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Divacky Roman <xdivac02@stud.fit.vutbr.cz> wrote:
[no cachesize detection]
> my CPU is:
> CPU: AMD Athlon(tm) XP 2500+ (1834.88-MHz 686-class CPU)
> Origin = "AuthenticAMD" Id = 0x6a0 Stepping = 0
> Features=0x383fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE>
> AMD Features=0xc0400800<SYSCALL,MMX+,3DNow+,3DNow>
So the AMD64 code works (on AMD processors) but the IA32 (on AMD) fails.
Either I did something completely wrong, or it's a small typo I do overlook
(tomatoes on the eyes...). Can someone with a little bit of AMD feature
detection knowledge have a look at:
---snip---
static void
setPQL2_AMD(int *const size, int *const ways) {
if (cpu_exthigh >= 0x80000006) {
u_int regs[4];
do_cpuid(0x80000006, regs);
*size = regs[2] >> 16;
*ways = (regs[2] >> 12) & 0x0f;
if(*ways == 255) /* fully associative */
*ways = 1;
}
}
void
setPQL2(int *const size, int *const ways)
{
if (strcmp(cpu_vendor, "AuthenticAMD") == 0)
setPQL2_AMD(size, ways);
else if (strcmp(cpu_vendor, "GenuineIntel") == 0)
setPQL2_INTEL(size, ways);
}
---snip---
This is from sys/i386/i386/identcpu.c.
Bye,
Alexander.
--
http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7
http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
When we are planning for posterity, we ought to remember that virtue is
not hereditary.
-- Thomas Paine
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