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Subject[patch 2.4 1/2] backport 2.6 x86 cpu capabilities

(hopefully destined for 2.4.23-pre1)

#
# include/asm-i386/msr.h 1.8 -> 1.9
# include/asm-i386/cpufeature.h 1.5 -> 1.6
# arch/i386/kernel/setup.c 1.70 -> 1.71
#
# --------------------------------------------
# 03/08/07 jgarzik@redhat.com 1.1066
# [ia32] Via, Intel cpu capabilities update
#
# * /proc/cpuinfo support for Intel Prescott New Instructions (PNI)
# * /proc/cpuinfo support for Centuar Extended Feature Flags
# (including "xstore", Via RNG support)
# * at boot time, input x86 capability data for the two featuresets
# * sync include/asm-i386/cpufeature.h definitions with 2.6.x
# --------------------------------------------
#
diff -Nru a/arch/i386/kernel/setup.c b/arch/i386/kernel/setup.c
--- a/arch/i386/kernel/setup.c Thu Aug 7 22:51:33 2003
+++ b/arch/i386/kernel/setup.c Thu Aug 7 22:51:33 2003
@@ -1965,6 +1965,37 @@

#endif

+static void __init init_c3(struct cpuinfo_x86 *c)
+{
+ u32 lo, hi;
+
+ /* Test for Centaur Extended Feature Flags presence */
+ if (cpuid_eax(0xC0000000) >= 0xC0000001) {
+ /* store Centaur Extended Feature Flags as
+ * word 5 of the CPU capability bit array
+ */
+ c->x86_capability[5] = cpuid_edx(0xC0000001);
+ }
+
+ switch (c->x86_model) {
+ case 6 ... 8: /* Cyrix III family */
+ rdmsr (MSR_VIA_FCR, lo, hi);
+ lo |= (1<<1 | 1<<7); /* Report CX8 & enable PGE */
+ wrmsr (MSR_VIA_FCR, lo, hi);
+
+ set_bit(X86_FEATURE_CX8, c->x86_capability);
+ set_bit(X86_FEATURE_3DNOW, c->x86_capability);
+
+ /* fall through */
+
+ case 9: /* Nehemiah */
+ default:
+ get_model_name(c);
+ display_cacheinfo(c);
+ break;
+ }
+}
+
static void __init init_centaur(struct cpuinfo_x86 *c)
{
enum {
@@ -2103,23 +2134,7 @@
break;

case 6:
- switch (c->x86_model) {
- case 6 ... 8: /* Cyrix III family */
- rdmsr (MSR_VIA_FCR, lo, hi);
- lo |= (1<<1 | 1<<7); /* Report CX8 & enable PGE */
- wrmsr (MSR_VIA_FCR, lo, hi);
-
- set_bit(X86_FEATURE_CX8, &c->x86_capability);
- set_bit(X86_FEATURE_3DNOW, &c->x86_capability);
-
- /* fall through */
-
- case 9: /* Nehemiah */
- default:
- get_model_name(c);
- display_cacheinfo(c);
- break;
- }
+ init_c3(c);
break;
}
}
@@ -2754,10 +2769,16 @@

/* Intel-defined flags: level 0x00000001 */
if ( c->cpuid_level >= 0x00000001 ) {
- cpuid(0x00000001, &tfms, &junk, &junk,
- &c->x86_capability[0]);
+ u32 capability, excap;
+ cpuid(0x00000001, &tfms, &junk, &excap, &capability);
+ c->x86_capability[0] = capability;
+ c->x86_capability[4] = excap;
c->x86 = (tfms >> 8) & 15;
c->x86_model = (tfms >> 4) & 15;
+ if (c->x86 == 0xf) {
+ c->x86 += (tfms >> 20) & 0xff;
+ c->x86_model += ((tfms >> 16) & 0xF) << 4;
+ }
c->x86_mask = tfms & 15;
} else {
/* Have CPUID level 0 only - unheard of */
@@ -2961,12 +2982,12 @@
"fpu", "vme", "de", "pse", "tsc", "msr", "pae", "mce",
"cx8", "apic", NULL, "sep", "mtrr", "pge", "mca", "cmov",
"pat", "pse36", "pn", "clflush", NULL, "dts", "acpi", "mmx",
- "fxsr", "sse", "sse2", "ss", "ht", "tm", "ia64", NULL,
+ "fxsr", "sse", "sse2", "ss", "ht", "tm", "ia64", "pbe",

/* AMD-defined */
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, "syscall", NULL, NULL, NULL, NULL,
- NULL, NULL, NULL, NULL, NULL, NULL, "mmxext", NULL,
+ NULL, NULL, NULL, "mp", NULL, NULL, "mmxext", NULL,
NULL, NULL, NULL, NULL, NULL, "lm", "3dnowext", "3dnow",

/* Transmeta-defined */
@@ -2976,7 +2997,20 @@
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,

/* Other (Linux-defined) */
- "cxmmx", "k6_mtrr", "cyrix_arr", "centaur_mcr", NULL, NULL, NULL, NULL,
+ "cxmmx", "k6_mtrr", "cyrix_arr", "centaur_mcr",
+ NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+
+ /* Intel-defined (#2) */
+ "pni", NULL, NULL, "monitor", "ds_cpl", NULL, NULL, "tm2",
+ "est", NULL, "cid", NULL, NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+
+ /* VIA/Cyrix/Centaur-defined */
+ NULL, NULL, "xstore", NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
diff -Nru a/include/asm-i386/cpufeature.h b/include/asm-i386/cpufeature.h
--- a/include/asm-i386/cpufeature.h Thu Aug 7 22:51:33 2003
+++ b/include/asm-i386/cpufeature.h Thu Aug 7 22:51:33 2003
@@ -10,9 +10,9 @@
/* Sample usage: CPU_FEATURE_P(cpu.x86_capability, FPU) */
#define CPU_FEATURE_P(CAP, FEATURE) test_bit(CAP, X86_FEATURE_##FEATURE ##_BIT)

-#define NCAPINTS 4 /* Currently we have 4 32-bit words worth of info */
+#define NCAPINTS 6 /* Currently we have 6 32-bit words worth of info */

-/* Intel-defined CPU features, CPUID level 0x00000001, word 0 */
+/* Intel-defined CPU features, CPUID level 0x00000001 (edx), word 0 */
#define X86_FEATURE_FPU (0*32+ 0) /* Onboard FPU */
#define X86_FEATURE_VME (0*32+ 1) /* Virtual Mode Extensions */
#define X86_FEATURE_DE (0*32+ 2) /* Debugging Extensions */
@@ -47,6 +47,7 @@
/* AMD-defined CPU features, CPUID level 0x80000001, word 1 */
/* Don't duplicate feature flags which are redundant with Intel! */
#define X86_FEATURE_SYSCALL (1*32+11) /* SYSCALL/SYSRET */
+#define X86_FEATURE_MP (1*32+19) /* MP Capable. */
#define X86_FEATURE_MMXEXT (1*32+22) /* AMD MMX extensions */
#define X86_FEATURE_LM (1*32+29) /* Long Mode (x86-64) */
#define X86_FEATURE_3DNOWEXT (1*32+30) /* AMD 3DNow! extensions */
@@ -63,10 +64,19 @@
#define X86_FEATURE_K6_MTRR (3*32+ 1) /* AMD K6 nonstandard MTRRs */
#define X86_FEATURE_CYRIX_ARR (3*32+ 2) /* Cyrix ARRs (= MTRRs) */
#define X86_FEATURE_CENTAUR_MCR (3*32+ 3) /* Centaur MCRs (= MTRRs) */
+/* cpu types for specific tunings: */
+#define X86_FEATURE_K8 (3*32+ 4) /* Opteron, Athlon64 */
+#define X86_FEATURE_K7 (3*32+ 5) /* Athlon */
+#define X86_FEATURE_P3 (3*32+ 6) /* P3 */
+#define X86_FEATURE_P4 (3*32+ 7) /* P4 */

-/* Intel defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
+/* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
#define X86_FEATURE_EST (4*32+ 7) /* Enhanced SpeedStep */

+/* VIA/Cyrix/Centaur-defined CPU features, CPUID level 0xC0000001, word 5 */
+#define X86_FEATURE_XSTORE (5*32+ 2) /* on-CPU RNG present (xstore insn) */
+
+
#define cpu_has(c, bit) test_bit(bit, (c)->x86_capability)
#define boot_cpu_has(bit) test_bit(bit, boot_cpu_data.x86_capability)

@@ -77,7 +87,9 @@
#define cpu_has_tsc boot_cpu_has(X86_FEATURE_TSC)
#define cpu_has_pae boot_cpu_has(X86_FEATURE_PAE)
#define cpu_has_pge boot_cpu_has(X86_FEATURE_PGE)
+#define cpu_has_sse2 boot_cpu_has(X86_FEATURE_XMM2)
#define cpu_has_apic boot_cpu_has(X86_FEATURE_APIC)
+#define cpu_has_sep boot_cpu_has(X86_FEATURE_SEP)
#define cpu_has_mtrr boot_cpu_has(X86_FEATURE_MTRR)
#define cpu_has_mmx boot_cpu_has(X86_FEATURE_MMX)
#define cpu_has_fxsr boot_cpu_has(X86_FEATURE_FXSR)
@@ -87,6 +99,7 @@
#define cpu_has_k6_mtrr boot_cpu_has(X86_FEATURE_K6_MTRR)
#define cpu_has_cyrix_arr boot_cpu_has(X86_FEATURE_CYRIX_ARR)
#define cpu_has_centaur_mcr boot_cpu_has(X86_FEATURE_CENTAUR_MCR)
+#define cpu_has_xstore boot_cpu_has(X86_FEATURE_XSTORE)

#endif /* __ASM_I386_CPUFEATURE_H */

diff -Nru a/include/asm-i386/msr.h b/include/asm-i386/msr.h
--- a/include/asm-i386/msr.h Thu Aug 7 22:51:33 2003
+++ b/include/asm-i386/msr.h Thu Aug 7 22:51:33 2003
@@ -113,6 +113,7 @@
/* VIA Cyrix defined MSRs*/
#define MSR_VIA_FCR 0x1107
#define MSR_VIA_LONGHAUL 0x110a
+#define MSR_VIA_RNG 0x110b
#define MSR_VIA_BCR2 0x1147

/* Transmeta defined MSRs */
-
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