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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/bitops.h> |
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5 | #include <linux/delay.h> |
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6 | #include <linux/pci.h> |
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7 | #include <asm/dma.h> |
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8 | #include <asm/io.h> |
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9 | #include <asm/processor.h> |
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10 | #include <asm/timer.h> |
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11 | |||
12 | #include "cpu.h" |
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13 | |||
14 | /* |
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15 | * Read NSC/Cyrix DEVID registers (DIR) to get more detailed info. about the CPU |
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16 | */ |
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17 | void __init do_cyrix_devid(unsigned char *dir0, unsigned char *dir1) |
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18 | { |
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19 | unsigned char ccr2, ccr3; |
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20 | unsigned long flags; |
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21 | |||
22 | /* we test for DEVID by checking whether CCR3 is writable */ |
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23 | local_irq_save(flags); |
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24 | ccr3 = getCx86(CX86_CCR3); |
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25 | setCx86(CX86_CCR3, ccr3 ^ 0x80); |
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26 | getCx86(0xc0); /* dummy to change bus */ |
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27 | |||
28 | if (getCx86(CX86_CCR3) == ccr3) { /* no DEVID regs. */ |
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29 | ccr2 = getCx86(CX86_CCR2); |
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30 | setCx86(CX86_CCR2, ccr2 ^ 0x04); |
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31 | getCx86(0xc0); /* dummy */ |
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32 | |||
33 | if (getCx86(CX86_CCR2) == ccr2) /* old Cx486SLC/DLC */ |
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34 | *dir0 = 0xfd; |
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35 | else { /* Cx486S A step */ |
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36 | setCx86(CX86_CCR2, ccr2); |
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37 | *dir0 = 0xfe; |
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38 | } |
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39 | } |
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40 | else { |
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41 | setCx86(CX86_CCR3, ccr3); /* restore CCR3 */ |
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42 | |||
43 | /* read DIR0 and DIR1 CPU registers */ |
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44 | *dir0 = getCx86(CX86_DIR0); |
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45 | *dir1 = getCx86(CX86_DIR1); |
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46 | } |
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47 | local_irq_restore(flags); |
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48 | } |
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49 | |||
50 | /* |
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51 | * Cx86_dir0_msb is a HACK needed by check_cx686_cpuid/slop in bugs.h in |
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52 | * order to identify the Cyrix CPU model after we're out of setup.c |
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53 | * |
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54 | * Actually since bugs.h doesn't even reference this perhaps someone should |
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55 | * fix the documentation ??? |
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56 | */ |
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57 | static unsigned char Cx86_dir0_msb __initdata = 0; |
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58 | |||
59 | static char Cx86_model[][9] __initdata = { |
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60 | "Cx486", "Cx486", "5x86 ", "6x86", "MediaGX ", "6x86MX ", |
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61 | "M II ", "Unknown" |
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62 | }; |
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63 | static char Cx486_name[][5] __initdata = { |
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64 | "SLC", "DLC", "SLC2", "DLC2", "SRx", "DRx", |
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65 | "SRx2", "DRx2" |
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66 | }; |
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67 | static char Cx486S_name[][4] __initdata = { |
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68 | "S", "S2", "Se", "S2e" |
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69 | }; |
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70 | static char Cx486D_name[][4] __initdata = { |
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71 | "DX", "DX2", "?", "?", "?", "DX4" |
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72 | }; |
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73 | static char Cx86_cb[] __initdata = "?.5x Core/Bus Clock"; |
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74 | static char cyrix_model_mult1[] __initdata = "12??43"; |
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75 | static char cyrix_model_mult2[] __initdata = "12233445"; |
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76 | |||
77 | /* |
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78 | * Reset the slow-loop (SLOP) bit on the 686(L) which is set by some old |
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79 | * BIOSes for compatibility with DOS games. This makes the udelay loop |
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80 | * work correctly, and improves performance. |
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81 | * |
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82 | * FIXME: our newer udelay uses the tsc. We don't need to frob with SLOP |
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83 | */ |
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84 | |||
85 | extern void calibrate_delay(void) __init; |
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86 | |||
87 | static void __init check_cx686_slop(struct cpuinfo_x86 *c) |
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88 | { |
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89 | unsigned long flags; |
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90 | |||
91 | if (Cx86_dir0_msb == 3) { |
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92 | unsigned char ccr3, ccr5; |
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93 | |||
94 | local_irq_save(flags); |
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95 | ccr3 = getCx86(CX86_CCR3); |
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96 | setCx86(CX86_CCR3, (ccr3 & 0x0f) | 0x10); /* enable MAPEN */ |
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97 | ccr5 = getCx86(CX86_CCR5); |
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98 | if (ccr5 & 2) |
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99 | setCx86(CX86_CCR5, ccr5 & 0xfd); /* reset SLOP */ |
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100 | setCx86(CX86_CCR3, ccr3); /* disable MAPEN */ |
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101 | local_irq_restore(flags); |
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102 | |||
103 | /*if (ccr5 & 2) { // possible wrong calibration done |
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104 | printk(KERN_INFO "Recalibrating delay loop with SLOP bit reset\n"); |
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105 | //!!!calibrate_delay(); |
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106 | c->loops_per_jiffy = loops_per_jiffy; |
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107 | }*/ |
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108 | } |
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109 | } |
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110 | |||
111 | |||
112 | static void __init set_cx86_reorder(void) |
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113 | { |
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114 | u8 ccr3; |
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115 | |||
116 | printk(KERN_INFO "Enable Memory access reorder on Cyrix/NSC processor.\n"); |
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117 | ccr3 = getCx86(CX86_CCR3); |
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118 | setCx86(CX86_CCR3, (ccr3 & 0x0f) | 0x10); /* enable MAPEN */ |
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119 | |||
120 | /* Load/Store Serialize to mem access disable (=reorder it) */ |
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121 | setCx86(CX86_PCR0, getCx86(CX86_PCR0) & ~0x80); |
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122 | /* set load/store serialize from 1GB to 4GB */ |
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123 | ccr3 |= 0xe0; |
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124 | setCx86(CX86_CCR3, ccr3); |
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125 | } |
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126 | |||
127 | static void __init set_cx86_memwb(void) |
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128 | { |
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129 | u32 cr0; |
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130 | |||
131 | printk(KERN_INFO "Enable Memory-Write-back mode on Cyrix/NSC processor.\n"); |
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132 | |||
133 | /* CCR2 bit 2: unlock NW bit */ |
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134 | setCx86(CX86_CCR2, getCx86(CX86_CCR2) & ~0x04); |
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135 | /* set 'Not Write-through' */ |
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136 | cr0 = 0x20000000; |
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137 | __asm__("movl %%cr0,%%eax\n\t" |
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138 | "orl %0,%%eax\n\t" |
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139 | "movl %%eax,%%cr0\n" |
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140 | : : "r" (cr0) |
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141 | :"ax"); |
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142 | /* CCR2 bit 2: lock NW bit and set WT1 */ |
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143 | setCx86(CX86_CCR2, getCx86(CX86_CCR2) | 0x14 ); |
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144 | } |
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145 | |||
146 | static void __init set_cx86_inc(void) |
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147 | { |
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148 | unsigned char ccr3; |
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149 | |||
150 | printk(KERN_INFO "Enable Incrementor on Cyrix/NSC processor.\n"); |
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151 | |||
152 | ccr3 = getCx86(CX86_CCR3); |
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153 | setCx86(CX86_CCR3, (ccr3 & 0x0f) | 0x10); /* enable MAPEN */ |
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154 | /* PCR1 -- Performance Control */ |
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155 | /* Incrementor on, whatever that is */ |
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156 | setCx86(CX86_PCR1, getCx86(CX86_PCR1) | 0x02); |
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157 | /* PCR0 -- Performance Control */ |
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158 | /* Incrementor Margin 10 */ |
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159 | setCx86(CX86_PCR0, getCx86(CX86_PCR0) | 0x04); |
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160 | setCx86(CX86_CCR3, ccr3); /* disable MAPEN */ |
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161 | } |
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162 | |||
163 | /* |
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164 | * Configure later MediaGX and/or Geode processor. |
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165 | */ |
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166 | |||
167 | static void __init geode_configure(void) |
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168 | { |
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169 | unsigned long flags; |
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170 | u8 ccr3, ccr4; |
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171 | local_irq_save(flags); |
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172 | |||
173 | ccr3 = getCx86(CX86_CCR3); |
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174 | setCx86(CX86_CCR3, (ccr3 & 0x0f) | 0x10); /* Enable */ |
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175 | |||
176 | ccr4 = getCx86(CX86_CCR4); |
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177 | ccr4 |= 0x38; /* FPU fast, DTE cache, Mem bypass */ |
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178 | |||
179 | setCx86(CX86_CCR3, ccr3); |
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180 | |||
181 | set_cx86_memwb(); |
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182 | set_cx86_reorder(); |
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183 | set_cx86_inc(); |
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184 | |||
185 | local_irq_restore(flags); |
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186 | } |
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187 | |||
188 | |||
189 | static void __init init_cyrix(struct cpuinfo_x86 *c) |
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190 | { |
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191 | unsigned char dir0, dir0_msn, dir0_lsn, dir1 = 0; |
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192 | char *buf = c->x86_model_id; |
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193 | const char *p = NULL; |
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194 | |||
195 | /* Bit 31 in normal CPUID used for nonstandard 3DNow ID; |
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196 | 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */ |
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197 | clear_bit(0*32+31, c->x86_capability); |
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198 | |||
199 | /* Cyrix used bit 24 in extended (AMD) CPUID for Cyrix MMX extensions */ |
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200 | if ( test_bit(1*32+24, c->x86_capability) ) { |
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201 | clear_bit(1*32+24, c->x86_capability); |
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202 | set_bit(X86_FEATURE_CXMMX, c->x86_capability); |
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203 | } |
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204 | |||
205 | do_cyrix_devid(&dir0, &dir1); |
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206 | |||
207 | check_cx686_slop(c); |
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208 | |||
209 | Cx86_dir0_msb = dir0_msn = dir0 >> 4; /* identifies CPU "family" */ |
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210 | dir0_lsn = dir0 & 0xf; /* model or clock multiplier */ |
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211 | |||
212 | /* common case step number/rev -- exceptions handled below */ |
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213 | c->x86_model = (dir1 >> 4) + 1; |
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214 | c->x86_mask = dir1 & 0xf; |
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215 | |||
216 | /* Now cook; the original recipe is by Channing Corn, from Cyrix. |
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217 | * We do the same thing for each generation: we work out |
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218 | * the model, multiplier and stepping. Black magic included, |
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219 | * to make the silicon step/rev numbers match the printed ones. |
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220 | */ |
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221 | |||
222 | switch (dir0_msn) { |
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223 | unsigned char tmp; |
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224 | |||
225 | case 0: /* Cx486SLC/DLC/SRx/DRx */ |
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226 | p = Cx486_name[dir0_lsn & 7]; |
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227 | break; |
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228 | |||
229 | case 1: /* Cx486S/DX/DX2/DX4 */ |
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230 | p = (dir0_lsn & 8) ? Cx486D_name[dir0_lsn & 5] |
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231 | : Cx486S_name[dir0_lsn & 3]; |
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232 | break; |
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233 | |||
234 | case 2: /* 5x86 */ |
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235 | Cx86_cb[2] = cyrix_model_mult1[dir0_lsn & 5]; |
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236 | p = Cx86_cb+2; |
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237 | break; |
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238 | |||
239 | case 3: /* 6x86/6x86L */ |
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240 | Cx86_cb[1] = ' '; |
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241 | Cx86_cb[2] = cyrix_model_mult1[dir0_lsn & 5]; |
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242 | if (dir1 > 0x21) { /* 686L */ |
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243 | Cx86_cb[0] = 'L'; |
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244 | p = Cx86_cb; |
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245 | (c->x86_model)++; |
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246 | } else /* 686 */ |
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247 | p = Cx86_cb+1; |
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248 | /* Emulate MTRRs using Cyrix's ARRs. */ |
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249 | set_bit(X86_FEATURE_CYRIX_ARR, c->x86_capability); |
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250 | /* 6x86's contain this bug */ |
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251 | c->coma_bug = 1; |
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252 | break; |
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253 | |||
254 | case 4: /* MediaGX/GXm or Geode GXM/GXLV/GX1 */ |
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255 | #ifdef CONFIG_PCI |
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256 | /* It isn't really a PCI quirk directly, but the cure is the |
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257 | same. The MediaGX has deep magic SMM stuff that handles the |
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258 | SB emulation. It thows away the fifo on disable_dma() which |
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259 | is wrong and ruins the audio. |
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260 | |||
261 | Bug2: VSA1 has a wrap bug so that using maximum sized DMA |
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262 | causes bad things. According to NatSemi VSA2 has another |
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263 | bug to do with 'hlt'. I've not seen any boards using VSA2 |
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264 | and X doesn't seem to support it either so who cares 8). |
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265 | VSA1 we work around however. |
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266 | */ |
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267 | |||
268 | printk(KERN_INFO "Working around Cyrix MediaGX virtual DMA bugs.\n"); |
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269 | isa_dma_bridge_buggy = 2; |
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270 | #endif |
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271 | c->x86_cache_size=16; /* Yep 16K integrated cache thats it */ |
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272 | |||
273 | /* |
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274 | * The 5510/5520 companion chips have a funky PIT. |
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275 | */ |
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276 | /*!!!if (pci_find_device(PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5510, NULL) || |
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277 | pci_find_device(PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5520, NULL)) |
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278 | pit_latch_buggy = 1;*/ |
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279 | |||
280 | /* GXm supports extended cpuid levels 'ala' AMD */ |
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281 | if (c->cpuid_level == 2) { |
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282 | /* Enable cxMMX extensions (GX1 Datasheet 54) */ |
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283 | setCx86(CX86_CCR7, getCx86(CX86_CCR7)|1); |
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284 | |||
285 | /* GXlv/GXm/GX1 */ |
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286 | if((dir1 >= 0x50 && dir1 <= 0x54) || dir1 >= 0x63) |
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287 | geode_configure(); |
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288 | get_model_name(c); /* get CPU marketing name */ |
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289 | |||
290 | return; |
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291 | } |
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292 | else { /* MediaGX */ |
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293 | Cx86_cb[2] = (dir0_lsn & 1) ? '3' : '4'; |
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294 | p = Cx86_cb+2; |
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295 | c->x86_model = (dir1 & 0x20) ? 1 : 2; |
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296 | } |
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297 | break; |
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298 | |||
299 | case 5: /* 6x86MX/M II */ |
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300 | if (dir1 > 7) |
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301 | { |
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302 | dir0_msn++; /* M II */ |
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303 | /* Enable MMX extensions (App note 108) */ |
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304 | setCx86(CX86_CCR7, getCx86(CX86_CCR7)|1); |
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305 | } |
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306 | else |
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307 | { |
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308 | c->coma_bug = 1; /* 6x86MX, it has the bug. */ |
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309 | } |
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310 | tmp = (!(dir0_lsn & 7) || dir0_lsn & 1) ? 2 : 0; |
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311 | Cx86_cb[tmp] = cyrix_model_mult2[dir0_lsn & 7]; |
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312 | p = Cx86_cb+tmp; |
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313 | if (((dir1 & 0x0f) > 4) || ((dir1 & 0xf0) == 0x20)) |
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314 | (c->x86_model)++; |
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315 | /* Emulate MTRRs using Cyrix's ARRs. */ |
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316 | set_bit(X86_FEATURE_CYRIX_ARR, c->x86_capability); |
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317 | break; |
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318 | |||
319 | case 0xf: /* Cyrix 486 without DEVID registers */ |
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320 | switch (dir0_lsn) { |
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321 | case 0xd: /* either a 486SLC or DLC w/o DEVID */ |
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322 | dir0_msn = 0; |
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323 | p = Cx486_name[(c->hard_math) ? 1 : 0]; |
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324 | break; |
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325 | |||
326 | case 0xe: /* a 486S A step */ |
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327 | dir0_msn = 0; |
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328 | p = Cx486S_name[0]; |
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329 | break; |
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330 | } |
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331 | break; |
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332 | |||
333 | default: /* unknown (shouldn't happen, we know everyone ;-) */ |
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334 | dir0_msn = 7; |
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335 | break; |
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336 | } |
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337 | strcpy(buf, Cx86_model[dir0_msn & 7]); |
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338 | if (p) strcat(buf, p); |
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339 | |||
340 | return; |
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341 | } |
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342 | |||
343 | /* |
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344 | * Cyrix CPUs without cpuid or with cpuid not yet enabled can be detected |
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345 | * by the fact that they preserve the flags across the division of 5/2. |
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346 | * PII and PPro exhibit this behavior too, but they have cpuid available. |
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347 | */ |
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348 | |||
349 | /* |
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350 | * Perform the Cyrix 5/2 test. A Cyrix won't change |
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351 | * the flags, while other 486 chips will. |
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352 | */ |
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353 | static inline int test_cyrix_52div(void) |
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354 | { |
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355 | unsigned int test; |
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356 | |||
357 | __asm__ __volatile__( |
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358 | "sahf\n\t" /* clear flags (%eax = 0x0005) */ |
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359 | "div %b2\n\t" /* divide 5 by 2 */ |
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360 | "lahf" /* store flags into %ah */ |
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361 | : "=a" (test) |
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362 | : "0" (5), "q" (2) |
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363 | : "cc"); |
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364 | |||
365 | /* AH is 0x02 on Cyrix after the divide.. */ |
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366 | return (unsigned char) (test >> 8) == 0x02; |
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367 | } |
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368 | |||
369 | static void cyrix_identify(struct cpuinfo_x86 * c) |
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370 | { |
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371 | /* Detect Cyrix with disabled CPUID */ |
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372 | if ( c->x86 == 4 && test_cyrix_52div() ) { |
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373 | unsigned char dir0, dir1; |
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374 | |||
375 | strcpy(c->x86_vendor_id, "CyrixInstead"); |
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376 | c->x86_vendor = X86_VENDOR_CYRIX; |
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377 | |||
378 | /* Actually enable cpuid on the older cyrix */ |
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379 | |||
380 | /* Retrieve CPU revisions */ |
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381 | |||
382 | do_cyrix_devid(&dir0, &dir1); |
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383 | |||
384 | dir0>>=4; |
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385 | |||
386 | /* Check it is an affected model */ |
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387 | |||
388 | if (dir0 == 5 || dir0 == 3) |
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389 | { |
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390 | unsigned char ccr3, ccr4; |
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391 | unsigned long flags; |
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392 | printk(KERN_INFO "Enabling CPUID on Cyrix processor.\n"); |
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393 | local_irq_save(flags); |
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394 | ccr3 = getCx86(CX86_CCR3); |
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395 | setCx86(CX86_CCR3, (ccr3 & 0x0f) | 0x10); /* enable MAPEN */ |
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396 | ccr4 = getCx86(CX86_CCR4); |
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397 | setCx86(CX86_CCR4, ccr4 | 0x80); /* enable cpuid */ |
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398 | setCx86(CX86_CCR3, ccr3); /* disable MAPEN */ |
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399 | local_irq_restore(flags); |
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400 | } |
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401 | } |
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402 | generic_identify(c); |
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403 | } |
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404 | |||
405 | static struct cpu_dev cyrix_cpu_dev __initdata = { |
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406 | .c_vendor = "Cyrix", |
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407 | .c_ident = { "CyrixInstead" }, |
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408 | .c_init = init_cyrix, |
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409 | .c_identify = cyrix_identify, |
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410 | }; |
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411 | |||
412 | int __init cyrix_init_cpu(void) |
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413 | { |
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414 | cpu_devs[X86_VENDOR_CYRIX] = &cyrix_cpu_dev; |
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415 | return 0; |
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416 | } |
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417 | |||
418 | //early_arch_initcall(cyrix_init_cpu); |
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419 | |||
420 | static struct cpu_dev nsc_cpu_dev __initdata = { |
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421 | .c_vendor = "NSC", |
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422 | .c_ident = { "Geode by NSC" }, |
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423 | .c_init = init_cyrix, |
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424 | .c_identify = generic_identify, |
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425 | }; |
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426 | |||
427 | int __init nsc_init_cpu(void) |
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428 | { |
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429 | cpu_devs[X86_VENDOR_NSC] = &nsc_cpu_dev; |
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430 | return 0; |
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431 | } |
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432 | |||
433 | //early_arch_initcall(nsc_init_cpu); |