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Rev | Author | Line No. | Line |
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582 | mauro | 1 | #include <linuxcomp.h> |
2 | |||
3 | #include <linux/init.h> |
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4 | #include <linux/kernel.h> |
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5 | #include <linux/string.h> |
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6 | #include <linux/bitops.h> |
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7 | #include <linux/smp.h> |
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8 | #include <linux/thread_info.h> |
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9 | |||
10 | #include <asm/processor.h> |
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11 | #include <asm/msr.h> |
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12 | #include <asm/uaccess.h> |
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13 | |||
14 | #include "cpu.h" |
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15 | |||
16 | extern int trap_init_f00f_bug(void); |
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17 | |||
18 | #ifdef CONFIG_X86_INTEL_USERCOPY |
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19 | /* |
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20 | * Alignment at which movsl is preferred for bulk memory copies. |
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21 | */ |
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22 | struct movsl_mask movsl_mask; |
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23 | #endif |
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24 | |||
25 | /* |
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26 | * Early probe support logic for ppro memory erratum #50 |
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27 | * |
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28 | * This is called before we do cpu ident work |
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29 | */ |
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30 | |||
31 | int __init ppro_with_ram_bug(void) |
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32 | { |
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33 | char vendor_id[16]; |
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34 | int ident; |
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35 | |||
36 | /* Must have CPUID */ |
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37 | if(!have_cpuid_p()) |
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38 | return 0; |
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39 | if(cpuid_eax(0)<1) |
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40 | return 0; |
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41 | |||
42 | /* Must be Intel */ |
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43 | cpuid(0, &ident, |
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44 | (int *)&vendor_id[0], |
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45 | (int *)&vendor_id[8], |
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46 | (int *)&vendor_id[4]); |
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47 | |||
48 | if(memcmp(vendor_id, "IntelInside", 12)) |
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49 | return 0; |
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50 | |||
51 | ident = cpuid_eax(1); |
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52 | |||
53 | /* Model 6 */ |
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54 | |||
55 | if(((ident>>8)&15)!=6) |
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56 | return 0; |
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57 | |||
58 | /* Pentium Pro */ |
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59 | |||
60 | if(((ident>>4)&15)!=1) |
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61 | return 0; |
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62 | |||
63 | if((ident&15) < 8) |
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64 | { |
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65 | printk(KERN_INFO "Pentium Pro with Errata#50 detected. Taking evasive action.\n"); |
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66 | return 1; |
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67 | } |
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68 | printk(KERN_INFO "Your Pentium Pro seems ok.\n"); |
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69 | return 0; |
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70 | } |
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71 | |||
72 | #define LVL_1_INST 1 |
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73 | #define LVL_1_DATA 2 |
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74 | #define LVL_2 3 |
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75 | #define LVL_3 4 |
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76 | #define LVL_TRACE 5 |
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77 | |||
78 | struct _cache_table |
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79 | { |
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80 | unsigned char descriptor; |
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81 | char cache_type; |
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82 | short size; |
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83 | }; |
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84 | |||
85 | /* all the cache descriptor types we care about (no TLB or trace cache entries) */ |
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86 | static struct _cache_table cache_table[] __initdata = |
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87 | { |
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88 | { 0x06, LVL_1_INST, 8 }, |
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89 | { 0x08, LVL_1_INST, 16 }, |
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90 | { 0x0a, LVL_1_DATA, 8 }, |
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91 | { 0x0c, LVL_1_DATA, 16 }, |
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92 | { 0x22, LVL_3, 512 }, |
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93 | { 0x23, LVL_3, 1024 }, |
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94 | { 0x25, LVL_3, 2048 }, |
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95 | { 0x29, LVL_3, 4096 }, |
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96 | { 0x2c, LVL_1_DATA, 32 }, |
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97 | { 0x30, LVL_1_INST, 32 }, |
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98 | { 0x39, LVL_2, 128 }, |
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99 | { 0x3b, LVL_2, 128 }, |
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100 | { 0x3c, LVL_2, 256 }, |
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101 | { 0x41, LVL_2, 128 }, |
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102 | { 0x42, LVL_2, 256 }, |
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103 | { 0x43, LVL_2, 512 }, |
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104 | { 0x44, LVL_2, 1024 }, |
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105 | { 0x45, LVL_2, 2048 }, |
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106 | { 0x66, LVL_1_DATA, 8 }, |
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107 | { 0x67, LVL_1_DATA, 16 }, |
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108 | { 0x68, LVL_1_DATA, 32 }, |
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109 | { 0x70, LVL_TRACE, 12 }, |
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110 | { 0x71, LVL_TRACE, 16 }, |
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111 | { 0x72, LVL_TRACE, 32 }, |
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112 | { 0x79, LVL_2, 128 }, |
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113 | { 0x7a, LVL_2, 256 }, |
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114 | { 0x7b, LVL_2, 512 }, |
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115 | { 0x7c, LVL_2, 1024 }, |
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116 | { 0x82, LVL_2, 256 }, |
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117 | { 0x83, LVL_2, 512 }, |
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118 | { 0x84, LVL_2, 1024 }, |
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119 | { 0x85, LVL_2, 2048 }, |
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120 | { 0x86, LVL_2, 512 }, |
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121 | { 0x87, LVL_2, 1024 }, |
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122 | { 0x00, 0, 0} |
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123 | }; |
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124 | |||
125 | /* |
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126 | * P4 Xeon errata 037 workaround. |
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127 | * Hardware prefetcher may cause stale data to be loaded into the cache. |
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128 | */ |
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129 | static void __init Intel_errata_workarounds(struct cpuinfo_x86 *c) |
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130 | { |
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131 | unsigned long lo, hi; |
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132 | |||
133 | if ((c->x86 == 15) && (c->x86_model == 1) && (c->x86_mask == 1)) { |
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134 | rdmsr (MSR_IA32_MISC_ENABLE, lo, hi); |
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135 | if ((lo & (1<<9)) == 0) { |
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136 | printk (KERN_INFO "CPU: C0 stepping P4 Xeon detected.\n"); |
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137 | printk (KERN_INFO "CPU: Disabling hardware prefetching (Errata 037)\n"); |
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138 | lo |= (1<<9); /* Disable hw prefetching */ |
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139 | wrmsr (MSR_IA32_MISC_ENABLE, lo, hi); |
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140 | } |
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141 | } |
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142 | } |
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143 | |||
144 | |||
145 | static void __init init_intel(struct cpuinfo_x86 *c) |
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146 | { |
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147 | char *p = NULL; |
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148 | unsigned int trace = 0, l1i = 0, l1d = 0, l2 = 0, l3 = 0; /* Cache sizes */ |
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149 | |||
150 | #ifdef CONFIG_X86_F00F_BUG |
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151 | /* |
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152 | * All current models of Pentium and Pentium with MMX technology CPUs |
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153 | * have the F0 0F bug, which lets nonprivileged users lock up the system. |
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154 | * Note that the workaround only should be initialized once... |
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155 | */ |
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156 | c->f00f_bug = 0; |
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157 | if ( c->x86 == 5 ) { |
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158 | static int f00f_workaround_enabled = 0; |
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159 | |||
160 | c->f00f_bug = 1; |
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161 | if ( !f00f_workaround_enabled ) { |
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162 | trap_init_f00f_bug(); |
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163 | printk(KERN_NOTICE "Intel Pentium with F0 0F bug - workaround enabled.\n"); |
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164 | f00f_workaround_enabled = 1; |
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165 | } |
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166 | } |
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167 | #endif |
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168 | |||
169 | //!!!select_idle_routine(c); |
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170 | if (c->cpuid_level > 1) { |
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171 | /* supports eax=2 call */ |
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172 | int i, j, n; |
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173 | int regs[4]; |
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174 | unsigned char *dp = (unsigned char *)regs; |
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175 | |||
176 | /* Number of times to iterate */ |
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177 | n = cpuid_eax(2) & 0xFF; |
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178 | |||
179 | for ( i = 0 ; i < n ; i++ ) { |
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180 | cpuid(2, ®s[0], ®s[1], ®s[2], ®s[3]); |
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181 | |||
182 | /* If bit 31 is set, this is an unknown format */ |
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183 | for ( j = 0 ; j < 3 ; j++ ) { |
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184 | if ( regs[j] < 0 ) regs[j] = 0; |
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185 | } |
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186 | |||
187 | /* Byte 0 is level count, not a descriptor */ |
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188 | for ( j = 1 ; j < 16 ; j++ ) { |
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189 | unsigned char des = dp[j]; |
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190 | unsigned char k = 0; |
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191 | |||
192 | /* look up this descriptor in the table */ |
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193 | while (cache_table[k].descriptor != 0) |
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194 | { |
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195 | if (cache_table[k].descriptor == des) { |
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196 | switch (cache_table[k].cache_type) { |
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197 | case LVL_1_INST: |
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198 | l1i += cache_table[k].size; |
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199 | break; |
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200 | case LVL_1_DATA: |
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201 | l1d += cache_table[k].size; |
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202 | break; |
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203 | case LVL_2: |
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204 | l2 += cache_table[k].size; |
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205 | break; |
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206 | case LVL_3: |
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207 | l3 += cache_table[k].size; |
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208 | break; |
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209 | case LVL_TRACE: |
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210 | trace += cache_table[k].size; |
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211 | break; |
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212 | } |
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213 | |||
214 | break; |
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215 | } |
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216 | |||
217 | k++; |
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218 | } |
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219 | } |
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220 | } |
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221 | |||
222 | if ( trace ) |
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223 | printk (KERN_INFO "CPU: Trace cache: %dK uops", trace); |
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224 | else if ( l1i ) |
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225 | printk (KERN_INFO "CPU: L1 I cache: %dK", l1i); |
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226 | if ( l1d ) |
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227 | printk(", L1 D cache: %dK\n", l1d); |
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228 | if ( l2 ) |
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229 | printk(KERN_INFO "CPU: L2 cache: %dK\n", l2); |
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230 | if ( l3 ) |
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231 | printk(KERN_INFO "CPU: L3 cache: %dK\n", l3); |
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232 | |||
233 | /* |
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234 | * This assumes the L3 cache is shared; it typically lives in |
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235 | * the northbridge. The L1 caches are included by the L2 |
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236 | * cache, and so should not be included for the purpose of |
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237 | * SMP switching weights. |
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238 | */ |
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239 | c->x86_cache_size = l2 ? l2 : (l1i+l1d); |
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240 | } |
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241 | |||
242 | /* SEP CPUID bug: Pentium Pro reports SEP but doesn't have it until model 3 mask 3 */ |
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243 | if ((c->x86<<8 | c->x86_model<<4 | c->x86_mask) < 0x633) |
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244 | clear_bit(X86_FEATURE_SEP, c->x86_capability); |
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245 | |||
246 | /* Names for the Pentium II/Celeron processors |
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247 | detectable only by also checking the cache size. |
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248 | Dixon is NOT a Celeron. */ |
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249 | if (c->x86 == 6) { |
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250 | switch (c->x86_model) { |
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251 | case 5: |
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252 | if (c->x86_mask == 0) { |
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253 | if (l2 == 0) |
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254 | p = "Celeron (Covington)"; |
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255 | else if (l2 == 256) |
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256 | p = "Mobile Pentium II (Dixon)"; |
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257 | } |
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258 | break; |
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259 | |||
260 | case 6: |
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261 | if (l2 == 128) |
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262 | p = "Celeron (Mendocino)"; |
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263 | else if (c->x86_mask == 0 || c->x86_mask == 5) |
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264 | p = "Celeron-A"; |
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265 | break; |
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266 | |||
267 | case 8: |
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268 | if (l2 == 128) |
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269 | p = "Celeron (Coppermine)"; |
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270 | break; |
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271 | } |
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272 | } |
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273 | |||
274 | if ( p ) |
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275 | strcpy(c->x86_model_id, p); |
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276 | |||
277 | #ifdef CONFIG_X86_HT |
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278 | if (cpu_has(c, X86_FEATURE_HT)) { |
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279 | extern int phys_proc_id[NR_CPUS]; |
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280 | |||
281 | u32 eax, ebx, ecx, edx; |
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282 | int cpu = smp_processor_id(); |
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283 | |||
284 | cpuid(1, &eax, &ebx, &ecx, &edx); |
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285 | smp_num_siblings = (ebx & 0xff0000) >> 16; |
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286 | |||
287 | if (smp_num_siblings == 1) { |
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288 | printk(KERN_INFO "CPU: Hyper-Threading is disabled\n"); |
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289 | } else if (smp_num_siblings > 1 ) { |
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290 | /* |
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291 | * At this point we only support two siblings per |
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292 | * processor package. |
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293 | */ |
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294 | #define NR_SIBLINGS 2 |
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295 | if (smp_num_siblings != NR_SIBLINGS) { |
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296 | printk(KERN_WARNING "CPU: Unsupported number of the siblings %d", smp_num_siblings); |
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297 | smp_num_siblings = 1; |
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298 | goto too_many_siblings; |
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299 | } |
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300 | /* cpuid returns the value latched in the HW at reset, |
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301 | * not the APIC ID register's value. For any box |
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302 | * whose BIOS changes APIC IDs, like clustered APIC |
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303 | * systems, we must use hard_smp_processor_id. |
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304 | * See Intel's IA-32 SW Dev's Manual Vol2 under CPUID. |
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305 | */ |
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306 | phys_proc_id[cpu] = hard_smp_processor_id() & ~(smp_num_siblings - 1); |
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307 | |||
308 | printk(KERN_INFO "CPU: Physical Processor ID: %d\n", |
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309 | phys_proc_id[cpu]); |
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310 | } |
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311 | |||
312 | } |
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313 | too_many_siblings: |
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314 | |||
315 | #endif |
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316 | |||
317 | /* Work around errata */ |
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318 | Intel_errata_workarounds(c); |
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319 | |||
320 | #ifdef CONFIG_X86_INTEL_USERCOPY |
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321 | /* |
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322 | * Set up the preferred alignment for movsl bulk memory moves |
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323 | */ |
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324 | switch (c->x86) { |
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325 | case 4: /* 486: untested */ |
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326 | break; |
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327 | case 5: /* Old Pentia: untested */ |
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328 | break; |
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329 | case 6: /* PII/PIII only like movsl with 8-byte alignment */ |
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330 | movsl_mask.mask = 7; |
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331 | break; |
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332 | case 15: /* P4 is OK down to 8-byte alignment */ |
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333 | movsl_mask.mask = 7; |
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334 | break; |
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335 | } |
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336 | #endif |
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337 | |||
338 | if (c->x86 == 15) |
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339 | set_bit(X86_FEATURE_P4, c->x86_capability); |
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340 | if (c->x86 == 6) |
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341 | set_bit(X86_FEATURE_P3, c->x86_capability); |
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342 | } |
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343 | |||
344 | |||
345 | static unsigned int intel_size_cache(struct cpuinfo_x86 * c, unsigned int size) |
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346 | { |
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347 | /* Intel PIII Tualatin. This comes in two flavours. |
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348 | * One has 256kb of cache, the other 512. We have no way |
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349 | * to determine which, so we use a boottime override |
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350 | * for the 512kb model, and assume 256 otherwise. |
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351 | */ |
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352 | if ((c->x86 == 6) && (c->x86_model == 11) && (size == 0)) |
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353 | size = 256; |
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354 | return size; |
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355 | } |
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356 | |||
357 | static struct cpu_dev intel_cpu_dev __initdata = { |
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358 | .c_vendor = "Intel", |
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359 | .c_ident = { "GenuineIntel" }, |
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360 | .c_models = { |
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361 | { .vendor = X86_VENDOR_INTEL, .family = 4, .model_names = |
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362 | { |
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363 | [0] = "486 DX-25/33", |
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364 | [1] = "486 DX-50", |
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365 | [2] = "486 SX", |
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366 | [3] = "486 DX/2", |
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367 | [4] = "486 SL", |
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368 | [5] = "486 SX/2", |
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369 | [7] = "486 DX/2-WB", |
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370 | [8] = "486 DX/4", |
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371 | [9] = "486 DX/4-WB" |
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372 | } |
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373 | }, |
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374 | { .vendor = X86_VENDOR_INTEL, .family = 5, .model_names = |
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375 | { |
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376 | [0] = "Pentium 60/66 A-step", |
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377 | [1] = "Pentium 60/66", |
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378 | [2] = "Pentium 75 - 200", |
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379 | [3] = "OverDrive PODP5V83", |
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380 | [4] = "Pentium MMX", |
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381 | [7] = "Mobile Pentium 75 - 200", |
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382 | [8] = "Mobile Pentium MMX" |
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383 | } |
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384 | }, |
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385 | { .vendor = X86_VENDOR_INTEL, .family = 6, .model_names = |
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386 | { |
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387 | [0] = "Pentium Pro A-step", |
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388 | [1] = "Pentium Pro", |
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389 | [3] = "Pentium II (Klamath)", |
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390 | [4] = "Pentium II (Deschutes)", |
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391 | [5] = "Pentium II (Deschutes)", |
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392 | [6] = "Mobile Pentium II", |
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393 | [7] = "Pentium III (Katmai)", |
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394 | [8] = "Pentium III (Coppermine)", |
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395 | [10] = "Pentium III (Cascades)", |
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396 | [11] = "Pentium III (Tualatin)", |
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397 | } |
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398 | }, |
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399 | { .vendor = X86_VENDOR_INTEL, .family = 15, .model_names = |
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400 | { |
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401 | [0] = "Pentium 4 (Unknown)", |
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402 | [1] = "Pentium 4 (Willamette)", |
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403 | [2] = "Pentium 4 (Northwood)", |
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404 | [4] = "Pentium 4 (Foster)", |
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405 | [5] = "Pentium 4 (Foster)", |
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406 | } |
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407 | }, |
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408 | }, |
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409 | .c_init = init_intel, |
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410 | .c_identify = generic_identify, |
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411 | .c_size_cache = intel_size_cache, |
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412 | }; |
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413 | |||
414 | __init int intel_cpu_init(void) |
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415 | { |
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416 | cpu_devs[X86_VENDOR_INTEL] = &intel_cpu_dev; |
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417 | return 0; |
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418 | } |
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419 | |||
420 | // arch_initcall(intel_cpu_init); |
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421 |