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178 | palkovsky | 1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | #include <arch/pm.h> |
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30 | #include <arch/mm/page.h> |
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31 | #include <arch/types.h> |
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32 | |||
33 | |||
34 | /* |
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35 | * There is no segmentation in long mode so we set up flat mode. In this |
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36 | * mode, we use, for each privilege level, two segments spanning the |
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37 | * whole memory. One is for code and one is for data. |
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38 | */ |
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39 | |||
40 | struct descriptor gdt[GDT_ITEMS] = { |
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41 | /* NULL descriptor */ |
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42 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, |
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43 | /* KTEXT descriptor */ |
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44 | { .limit_0_15 = 0xffff, |
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45 | .base_0_15 = 0, |
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46 | .base_16_23 = 0, |
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47 | .access = AR_PRESENT | AR_CODE | DPL_KERNEL, |
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48 | .limit_16_19 = 0xf, |
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49 | .available = 0, |
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50 | .longmode = 1, |
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51 | .special = 0, |
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52 | .granularity = 1, |
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53 | .base_24_31 = 0 }, |
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54 | /* KDATA descriptor */ |
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55 | { .limit_0_15 = 0xffff, |
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56 | .base_0_15 = 0, |
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57 | .base_16_23 = 0, |
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58 | .access = AR_PRESENT | AR_DATA | AR_WRITABLE | DPL_KERNEL, |
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59 | .limit_16_19 = 0xf, |
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60 | .available = 0, |
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61 | .longmode = 0, |
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62 | .special = 0, |
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63 | .granularity = 0, |
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64 | .base_24_31 = 0 }, |
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65 | /* UTEXT descriptor */ |
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66 | { .limit_0_15 = 0xffff, |
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67 | .base_0_15 = 0, |
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68 | .base_16_23 = 0, |
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69 | .access = AR_PRESENT | AR_CODE | DPL_USER, |
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70 | .limit_16_19 = 0xf, |
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71 | .available = 0, |
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72 | .longmode = 1, |
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73 | .special = 0, |
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74 | .granularity = 0, |
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75 | .base_24_31 = 0 }, |
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76 | /* UDATA descriptor */ |
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77 | { .limit_0_15 = 0xffff, |
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78 | .base_0_15 = 0, |
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79 | .base_16_23 = 0, |
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80 | .access = AR_PRESENT | AR_DATA | AR_WRITABLE | DPL_USER, |
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81 | .limit_16_19 = 0xf, |
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82 | .available = 0, |
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83 | .longmode = 0, |
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84 | .special = 1, |
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85 | .granularity = 1, |
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86 | .base_24_31 = 0 }, |
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87 | /* TSS descriptor - set up will be completed later */ |
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88 | { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } |
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89 | }; |
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90 | |||
91 | struct idescriptor idt[IDT_ITEMS]; |
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92 | |||
93 | static struct tss tss; |
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94 | |||
95 | /* gdtr is changed by kmp before next CPU is initialized */ |
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96 | struct ptr_16_32 gdtr __attribute__ ((section ("K_DATA_START"))) = { .limit = sizeof(gdt) }; |
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97 | //struct ptr_16_32 gdtr __attribute__ ((section ("K_DATA_START"))) = { .limit = sizeof(gdt), .base = KA2PA((__address) gdt) }; |
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98 | struct ptr_16_32 idtr __attribute__ ((section ("K_DATA_START"))) = { .limit = sizeof(idt) }; |