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178 | palkovsky | 1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
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799 | palkovsky | 3 | * Copyright (C) 2005-2006 Ondrej Palkovsky |
178 | palkovsky | 4 | * All rights reserved. |
5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions |
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8 | * are met: |
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9 | * |
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10 | * - Redistributions of source code must retain the above copyright |
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11 | * notice, this list of conditions and the following disclaimer. |
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12 | * - Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * - The name of the author may not be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | */ |
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29 | |||
30 | #include <arch/pm.h> |
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31 | #include <arch/mm/page.h> |
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32 | #include <arch/types.h> |
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206 | palkovsky | 33 | #include <arch/interrupt.h> |
34 | #include <arch/asm.h> |
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576 | palkovsky | 35 | #include <interrupt.h> |
178 | palkovsky | 36 | |
206 | palkovsky | 37 | #include <config.h> |
178 | palkovsky | 38 | |
206 | palkovsky | 39 | #include <memstr.h> |
814 | palkovsky | 40 | #include <mm/slab.h> |
206 | palkovsky | 41 | #include <debug.h> |
42 | |||
178 | palkovsky | 43 | /* |
44 | * There is no segmentation in long mode so we set up flat mode. In this |
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45 | * mode, we use, for each privilege level, two segments spanning the |
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46 | * whole memory. One is for code and one is for data. |
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47 | */ |
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48 | |||
49 | struct descriptor gdt[GDT_ITEMS] = { |
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50 | /* NULL descriptor */ |
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51 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
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52 | /* KTEXT descriptor */ |
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53 | { .limit_0_15 = 0xffff, |
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54 | .base_0_15 = 0, |
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55 | .base_16_23 = 0, |
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188 | palkovsky | 56 | .access = AR_PRESENT | AR_CODE | DPL_KERNEL | AR_READABLE , |
178 | palkovsky | 57 | .limit_16_19 = 0xf, |
58 | .available = 0, |
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59 | .longmode = 1, |
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188 | palkovsky | 60 | .special = 0, |
178 | palkovsky | 61 | .granularity = 1, |
62 | .base_24_31 = 0 }, |
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63 | /* KDATA descriptor */ |
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64 | { .limit_0_15 = 0xffff, |
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65 | .base_0_15 = 0, |
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66 | .base_16_23 = 0, |
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67 | .access = AR_PRESENT | AR_DATA | AR_WRITABLE | DPL_KERNEL, |
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68 | .limit_16_19 = 0xf, |
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69 | .available = 0, |
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70 | .longmode = 0, |
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71 | .special = 0, |
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188 | palkovsky | 72 | .granularity = 1, |
178 | palkovsky | 73 | .base_24_31 = 0 }, |
803 | palkovsky | 74 | /* UDATA descriptor */ |
178 | palkovsky | 75 | { .limit_0_15 = 0xffff, |
76 | .base_0_15 = 0, |
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77 | .base_16_23 = 0, |
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803 | palkovsky | 78 | .access = AR_PRESENT | AR_DATA | AR_WRITABLE | DPL_USER, |
178 | palkovsky | 79 | .limit_16_19 = 0xf, |
80 | .available = 0, |
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803 | palkovsky | 81 | .longmode = 0, |
82 | .special = 1, |
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206 | palkovsky | 83 | .granularity = 1, |
178 | palkovsky | 84 | .base_24_31 = 0 }, |
803 | palkovsky | 85 | /* UTEXT descriptor */ |
178 | palkovsky | 86 | { .limit_0_15 = 0xffff, |
87 | .base_0_15 = 0, |
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88 | .base_16_23 = 0, |
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803 | palkovsky | 89 | .access = AR_PRESENT | AR_CODE | DPL_USER, |
178 | palkovsky | 90 | .limit_16_19 = 0xf, |
91 | .available = 0, |
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803 | palkovsky | 92 | .longmode = 1, |
93 | .special = 0, |
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178 | palkovsky | 94 | .granularity = 1, |
95 | .base_24_31 = 0 }, |
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332 | palkovsky | 96 | /* KTEXT 32-bit protected, for protected mode before long mode */ |
188 | palkovsky | 97 | { .limit_0_15 = 0xffff, |
98 | .base_0_15 = 0, |
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99 | .base_16_23 = 0, |
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100 | .access = AR_PRESENT | AR_CODE | DPL_KERNEL | AR_READABLE, |
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101 | .limit_16_19 = 0xf, |
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102 | .available = 0, |
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103 | .longmode = 0, |
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277 | palkovsky | 104 | .special = 1, |
188 | palkovsky | 105 | .granularity = 1, |
106 | .base_24_31 = 0 }, |
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206 | palkovsky | 107 | /* TSS descriptor - set up will be completed later, |
108 | * on AMD64 it is 64-bit - 2 items in table */ |
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109 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
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178 | palkovsky | 110 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } |
111 | }; |
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112 | |||
113 | struct idescriptor idt[IDT_ITEMS]; |
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114 | |||
231 | palkovsky | 115 | struct ptr_16_64 gdtr = {.limit = sizeof(gdt), .base= (__u64) gdt }; |
116 | struct ptr_16_64 idtr = {.limit = sizeof(idt), .base= (__u64) idt }; |
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229 | palkovsky | 117 | |
178 | palkovsky | 118 | static struct tss tss; |
208 | palkovsky | 119 | struct tss *tss_p = NULL; |
178 | palkovsky | 120 | |
206 | palkovsky | 121 | void gdt_tss_setbase(struct descriptor *d, __address base) |
122 | { |
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123 | struct tss_descriptor *td = (struct tss_descriptor *) d; |
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124 | |||
125 | td->base_0_15 = base & 0xffff; |
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126 | td->base_16_23 = ((base) >> 16) & 0xff; |
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127 | td->base_24_31 = ((base) >> 24) & 0xff; |
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128 | td->base_32_63 = ((base) >> 32); |
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129 | } |
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130 | |||
131 | void gdt_tss_setlimit(struct descriptor *d, __u32 limit) |
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132 | { |
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133 | struct tss_descriptor *td = (struct tss_descriptor *) d; |
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134 | |||
135 | td->limit_0_15 = limit & 0xffff; |
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136 | td->limit_16_19 = (limit >> 16) & 0xf; |
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137 | } |
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138 | |||
139 | void idt_setoffset(struct idescriptor *d, __address offset) |
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140 | { |
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141 | /* |
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142 | * Offset is a linear address. |
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143 | */ |
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144 | d->offset_0_15 = offset & 0xffff; |
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145 | d->offset_16_31 = offset >> 16 & 0xffff; |
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146 | d->offset_32_63 = offset >> 32; |
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147 | } |
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148 | |||
149 | void tss_initialize(struct tss *t) |
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150 | { |
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151 | memsetb((__address) t, sizeof(struct tss), 0); |
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152 | } |
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153 | |||
154 | /* |
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155 | * This function takes care of proper setup of IDT and IDTR. |
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156 | */ |
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157 | void idt_init(void) |
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158 | { |
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159 | struct idescriptor *d; |
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160 | int i; |
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161 | |||
162 | for (i = 0; i < IDT_ITEMS; i++) { |
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163 | d = &idt[i]; |
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164 | |||
165 | d->unused = 0; |
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211 | palkovsky | 166 | d->selector = gdtselector(KTEXT_DES); |
206 | palkovsky | 167 | |
168 | d->present = 1; |
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169 | d->type = AR_INTERRUPT; /* masking interrupt */ |
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170 | |||
171 | idt_setoffset(d, ((__address) interrupt_handlers) + i*interrupt_handler_size); |
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799 | palkovsky | 172 | exc_register(i, "undef", (iroutine)null_interrupt); |
206 | palkovsky | 173 | } |
576 | palkovsky | 174 | exc_register(13, "gp_fault", gp_fault); |
175 | exc_register( 7, "nm_fault", nm_fault); |
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176 | exc_register(12, "ss_fault", ss_fault); |
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206 | palkovsky | 177 | } |
178 | |||
799 | palkovsky | 179 | /** Initialize segmentation - code/data/idt tables |
180 | * |
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181 | */ |
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206 | palkovsky | 182 | void pm_init(void) |
183 | { |
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229 | palkovsky | 184 | struct descriptor *gdt_p = (struct descriptor *) gdtr.base; |
208 | palkovsky | 185 | struct tss_descriptor *tss_desc; |
206 | palkovsky | 186 | |
187 | /* |
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188 | * Each CPU has its private GDT and TSS. |
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189 | * All CPUs share one IDT. |
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190 | */ |
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191 | |||
192 | if (config.cpu_active == 1) { |
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193 | idt_init(); |
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194 | /* |
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195 | * NOTE: bootstrap CPU has statically allocated TSS, because |
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196 | * the heap hasn't been initialized so far. |
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197 | */ |
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198 | tss_p = &tss; |
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199 | } |
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200 | else { |
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822 | palkovsky | 201 | tss_p = (struct tss *) malloc(sizeof(struct tss),FRAME_ATOMIC); |
206 | palkovsky | 202 | if (!tss_p) |
203 | panic("could not allocate TSS\n"); |
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204 | } |
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205 | |||
206 | tss_initialize(tss_p); |
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207 | |||
208 | palkovsky | 208 | tss_desc = (struct tss_descriptor *) (&gdt_p[TSS_DES]); |
209 | tss_desc->present = 1; |
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210 | tss_desc->type = AR_TSS; |
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211 | tss_desc->dpl = PL_KERNEL; |
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206 | palkovsky | 212 | |
213 | gdt_tss_setbase(&gdt_p[TSS_DES], (__address) tss_p); |
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214 | gdt_tss_setlimit(&gdt_p[TSS_DES], sizeof(struct tss) - 1); |
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215 | |||
229 | palkovsky | 216 | __asm__("lgdt %0" : : "m"(gdtr)); |
217 | __asm__("lidt %0" : : "m"(idtr)); |
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206 | palkovsky | 218 | /* |
219 | * As of this moment, the current CPU has its own GDT pointing |
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220 | * to its own TSS. We just need to load the TR register. |
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221 | */ |
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222 | __asm__("ltr %0" : : "r" ((__u16) gdtselector(TSS_DES))); |
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223 | } |