1 #include <linux/config.h>
2 #include <linux/init.h>
3 #include <linux/kernel.h>
5 #include <linux/string.h>
6 #include <linux/bitops.h>
8 #include <linux/thread_info.h>
10 #include <asm/processor.h>
12 #include <asm/uaccess.h>
16 #ifdef CONFIG_X86_LOCAL_APIC
17 #include <asm/mpspec.h>
19 #include <mach_apic.h>
22 extern int trap_init_f00f_bug(void);
24 #ifdef CONFIG_X86_INTEL_USERCOPY
26 * Alignment at which movsl is preferred for bulk memory copies.
28 struct movsl_mask movsl_mask;
31 void __init early_intel_workaround(struct cpuinfo_x86 *c)
33 if (c->x86_vendor != X86_VENDOR_INTEL)
35 /* Netburst reports 64 bytes clflush size, but does IO in 128 bytes */
36 if (c->x86 == 15 && c->x86_cache_alignment == 64)
37 c->x86_cache_alignment = 128;
41 * Early probe support logic for ppro memory erratum #50
43 * This is called before we do cpu ident work
46 int __init ppro_with_ram_bug(void)
48 /* Uses data from early_cpu_detect now */
49 if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL &&
50 boot_cpu_data.x86 == 6 &&
51 boot_cpu_data.x86_model == 1 &&
52 boot_cpu_data.x86_mask < 8) {
53 printk(KERN_INFO "Pentium Pro with Errata#50 detected. Taking evasive action.\n");
61 * P4 Xeon errata 037 workaround.
62 * Hardware prefetcher may cause stale data to be loaded into the cache.
64 static void __init Intel_errata_workarounds(struct cpuinfo_x86 *c)
68 if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) {
69 rdmsr (MSR_IA32_MISC_ENABLE, lo, hi);
70 if ((lo & (1<<9)) == 0) {
71 printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n");
72 printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n");
73 lo |= (1<<9); /* Disable hw prefetching */
74 wrmsr (MSR_IA32_MISC_ENABLE, lo, hi);
81 * find out the number of processor cores on the die
83 static int __init num_cpu_cores(struct cpuinfo_x86 *c)
87 if (c->cpuid_level < 4)
96 return ((eax >> 26) + 1);
101 static void __init init_intel(struct cpuinfo_x86 *c)
106 #ifdef CONFIG_X86_F00F_BUG
108 * All current models of Pentium and Pentium with MMX technology CPUs
109 * have the F0 0F bug, which lets nonprivileged users lock up the system.
110 * Note that the workaround only should be initialized once...
114 static int f00f_workaround_enabled = 0;
117 if ( !f00f_workaround_enabled ) {
118 trap_init_f00f_bug();
119 printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n");
120 f00f_workaround_enabled = 1;
125 select_idle_routine(c);
126 l2 = init_intel_cacheinfo(c);
128 /* SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until model 3 mask 3 */
129 if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633)
130 clear_bit(X86_FEATURE_SEP, c->x86_capability);
132 /* Names for the Pentium II/Celeron processors
133 detectable only by also checking the cache size.
134 Dixon is NOT a Celeron. */
136 switch (c->x86_model) {
138 if (c->x86_mask == 0) {
140 p = "Celeron (Covington)";
142 p = "Mobile Pentium II (Dixon)";
148 p = "Celeron (Mendocino)";
149 else if (c->x86_mask == 0 || c->x86_mask == 5)
155 p = "Celeron (Coppermine)";
161 strcpy(c->x86_model_id, p);
163 c->x86_num_cores = num_cpu_cores(c);
167 /* Work around errata */
168 Intel_errata_workarounds(c);
170 #ifdef CONFIG_X86_INTEL_USERCOPY
172 * Set up the preferred alignment for movsl bulk memory moves
175 case 4: /* 486: untested */
177 case 5: /* Old Pentia: untested */
179 case 6: /* PII/PIII only like movsl with 8-byte alignment */
182 case 15: /* P4 is OK down to 8-byte alignment */
189 set_bit(X86_FEATURE_P4, c->x86_capability);
191 set_bit(X86_FEATURE_P3, c->x86_capability);
195 static unsigned int intel_size_cache(struct cpuinfo_x86 * c, unsigned int size)
197 /* Intel PIII Tualatin. This comes in two flavours.
198 * One has 256kb of cache, the other 512. We have no way
199 * to determine which, so we use a boottime override
200 * for the 512kb model, and assume 256 otherwise.
202 if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0))
207 static struct cpu_dev intel_cpu_dev __initdata = {
209 .c_ident = { "GenuineIntel" },
211 { .vendor = X86_VENDOR_INTEL, .family = 4, .model_names =
213 [0] = "486 DX-25/33",
224 { .vendor = X86_VENDOR_INTEL, .family = 5, .model_names =
226 [0] = "Pentium 60/66 A-step",
227 [1] = "Pentium 60/66",
228 [2] = "Pentium 75 - 200",
229 [3] = "OverDrive PODP5V83",
231 [7] = "Mobile Pentium 75 - 200",
232 [8] = "Mobile Pentium MMX"
235 { .vendor = X86_VENDOR_INTEL, .family = 6, .model_names =
237 [0] = "Pentium Pro A-step",
239 [3] = "Pentium II (Klamath)",
240 [4] = "Pentium II (Deschutes)",
241 [5] = "Pentium II (Deschutes)",
242 [6] = "Mobile Pentium II",
243 [7] = "Pentium III (Katmai)",
244 [8] = "Pentium III (Coppermine)",
245 [10] = "Pentium III (Cascades)",
246 [11] = "Pentium III (Tualatin)",
249 { .vendor = X86_VENDOR_INTEL, .family = 15, .model_names =
251 [0] = "Pentium 4 (Unknown)",
252 [1] = "Pentium 4 (Willamette)",
253 [2] = "Pentium 4 (Northwood)",
254 [4] = "Pentium 4 (Foster)",
255 [5] = "Pentium 4 (Foster)",
259 .c_init = init_intel,
260 .c_identify = generic_identify,
261 .c_size_cache = intel_size_cache,
264 __init int intel_cpu_init(void)
266 cpu_devs[X86_VENDOR_INTEL] = &intel_cpu_dev;
270 // arch_initcall(intel_cpu_init);