1 | /* |
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2 | * machine_kexec.c - handle transition of Linux booting another kernel |
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3 | * Copyright (C) 2002-2005 Eric Biederman <ebiederm@xmission.com> |
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4 | * |
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5 | * This source code is licensed under the GNU General Public License, |
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6 | * Version 2. See the file COPYING for more details. |
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7 | */ |
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8 | |
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9 | #include <linux/mm.h> |
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10 | #include <linux/kexec.h> |
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11 | #include <linux/delay.h> |
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12 | #include <asm/pgtable.h> |
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13 | #include <asm/pgalloc.h> |
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14 | #include <asm/tlbflush.h> |
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15 | #include <asm/mmu_context.h> |
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16 | #include <asm/io.h> |
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17 | #include <asm/apic.h> |
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18 | #include <asm/cpufeature.h> |
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19 | #include <asm/desc.h> |
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20 | #include <asm/system.h> |
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21 | |
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22 | #ifdef CONFIG_XEN |
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23 | #include <xen/interface/kexec.h> |
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24 | #endif |
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25 | |
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26 | #define PAGE_ALIGNED __attribute__ ((__aligned__(PAGE_SIZE))) |
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27 | static u32 kexec_pgd[1024] PAGE_ALIGNED; |
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28 | #ifdef CONFIG_X86_PAE |
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29 | static u32 kexec_pmd0[1024] PAGE_ALIGNED; |
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30 | static u32 kexec_pmd1[1024] PAGE_ALIGNED; |
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31 | #endif |
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32 | static u32 kexec_pte0[1024] PAGE_ALIGNED; |
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33 | static u32 kexec_pte1[1024] PAGE_ALIGNED; |
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34 | |
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35 | #ifdef CONFIG_XEN |
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36 | |
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37 | #define __ma(x) (pfn_to_mfn(__pa((x)) >> PAGE_SHIFT) << PAGE_SHIFT) |
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38 | |
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39 | #if PAGES_NR > KEXEC_XEN_NO_PAGES |
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40 | #error PAGES_NR is greater than KEXEC_XEN_NO_PAGES - Xen support will break |
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41 | #endif |
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42 | |
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43 | #if PA_CONTROL_PAGE != 0 |
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44 | #error PA_CONTROL_PAGE is non zero - Xen support will break |
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45 | #endif |
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46 | |
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47 | void machine_kexec_setup_load_arg(xen_kexec_image_t *xki, struct kimage *image) |
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48 | { |
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49 | void *control_page; |
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50 | |
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51 | memset(xki->page_list, 0, sizeof(xki->page_list)); |
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52 | |
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53 | control_page = page_address(image->control_code_page); |
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54 | memcpy(control_page, relocate_kernel, PAGE_SIZE); |
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55 | |
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56 | xki->page_list[PA_CONTROL_PAGE] = __ma(control_page); |
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57 | xki->page_list[PA_PGD] = __ma(kexec_pgd); |
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58 | #ifdef CONFIG_X86_PAE |
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59 | xki->page_list[PA_PMD_0] = __ma(kexec_pmd0); |
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60 | xki->page_list[PA_PMD_1] = __ma(kexec_pmd1); |
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61 | #endif |
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62 | xki->page_list[PA_PTE_0] = __ma(kexec_pte0); |
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63 | xki->page_list[PA_PTE_1] = __ma(kexec_pte1); |
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64 | |
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65 | } |
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66 | |
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67 | #endif /* CONFIG_XEN */ |
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68 | |
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69 | /* |
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70 | * A architecture hook called to validate the |
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71 | * proposed image and prepare the control pages |
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72 | * as needed. The pages for KEXEC_CONTROL_CODE_SIZE |
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73 | * have been allocated, but the segments have yet |
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74 | * been copied into the kernel. |
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75 | * |
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76 | * Do what every setup is needed on image and the |
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77 | * reboot code buffer to allow us to avoid allocations |
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78 | * later. |
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79 | * |
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80 | * Currently nothing. |
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81 | */ |
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82 | int machine_kexec_prepare(struct kimage *image) |
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83 | { |
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84 | return 0; |
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85 | } |
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86 | |
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87 | /* |
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88 | * Undo anything leftover by machine_kexec_prepare |
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89 | * when an image is freed. |
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90 | */ |
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91 | void machine_kexec_cleanup(struct kimage *image) |
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92 | { |
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93 | } |
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94 | |
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95 | #ifndef CONFIG_XEN |
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96 | /* |
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97 | * Do not allocate memory (or fail in any way) in machine_kexec(). |
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98 | * We are past the point of no return, committed to rebooting now. |
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99 | */ |
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100 | NORET_TYPE void machine_kexec(struct kimage *image) |
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101 | { |
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102 | unsigned long page_list[PAGES_NR]; |
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103 | void *control_page; |
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104 | |
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105 | /* Interrupts aren't acceptable while we reboot */ |
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106 | local_irq_disable(); |
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107 | |
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108 | control_page = page_address(image->control_code_page); |
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109 | memcpy(control_page, relocate_kernel, PAGE_SIZE); |
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110 | |
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111 | page_list[PA_CONTROL_PAGE] = __pa(control_page); |
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112 | page_list[VA_CONTROL_PAGE] = (unsigned long)relocate_kernel; |
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113 | page_list[PA_PGD] = __pa(kexec_pgd); |
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114 | page_list[VA_PGD] = (unsigned long)kexec_pgd; |
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115 | #ifdef CONFIG_X86_PAE |
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116 | page_list[PA_PMD_0] = __pa(kexec_pmd0); |
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117 | page_list[VA_PMD_0] = (unsigned long)kexec_pmd0; |
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118 | page_list[PA_PMD_1] = __pa(kexec_pmd1); |
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119 | page_list[VA_PMD_1] = (unsigned long)kexec_pmd1; |
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120 | #endif |
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121 | page_list[PA_PTE_0] = __pa(kexec_pte0); |
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122 | page_list[VA_PTE_0] = (unsigned long)kexec_pte0; |
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123 | page_list[PA_PTE_1] = __pa(kexec_pte1); |
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124 | page_list[VA_PTE_1] = (unsigned long)kexec_pte1; |
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125 | |
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126 | relocate_kernel((unsigned long)image->head, (unsigned long)page_list, |
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127 | image->start, cpu_has_pae); |
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128 | } |
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129 | #endif |
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