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1 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved. | 1 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved. |
2 // | 2 // |
3 // This program is free software: you can redistribute it and/or modify | 3 // This program is free software: you can redistribute it and/or modify |
4 // it under the terms of the GNU General Public License as published by | 4 // it under the terms of the GNU General Public License as published by |
5 // the Free Software Foundation, either version 3 of the License, or | 5 // the Free Software Foundation, either version 3 of the License, or |
6 // (at your option) any later version. | 6 // (at your option) any later version. |
7 // | 7 // |
8 // This program is distributed in the hope that it will be useful, | 8 // This program is distributed in the hope that it will be useful, |
9 // but WITHOUT ANY WARRANTY; without even the implied warranty of | 9 // but WITHOUT ANY WARRANTY; without even the implied warranty of |
10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | 10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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37 | 37 |
38 | 38 |
39 // Find where the preloaded params struct is located in RAM. At the moment | 39 // Find where the preloaded params struct is located in RAM. At the moment |
40 // we're assuming that it immediately precedes the start of the bootstub, | 40 // we're assuming that it immediately precedes the start of the bootstub, |
41 // aligned to a 4K boundary, because that's where our build system puts it. | 41 // aligned to a 4K boundary, because that's where our build system puts it. |
42 struct hacked_params *find_params_struct(UINTN bootstub_location) | 42 struct hacked_params *find_params_struct(UINTN bootstub_location) |
43 { | 43 { |
44 return (struct hacked_params *)(bootstub_location - 0x1000); | 44 return (struct hacked_params *)(bootstub_location - 0x1000); |
45 } | 45 } |
46 | 46 |
| 47 // Copy a string to the right within a buffer. |
| 48 static void shove_over(char *src, char *dst) |
| 49 { |
| 50 int i = 0; |
| 51 for (i=0; src[i]; i++) |
| 52 ; // find strlen(src) |
| 53 dst += i; |
| 54 src += i; |
| 55 i++; // also terminating '\0'; |
| 56 while (i--) |
| 57 *dst-- = *src--; |
| 58 } |
| 59 |
| 60 // sprintf(dst,"%02x",val) |
| 61 static void one_byte(char *dst, uint8_t val) |
| 62 { |
| 63 dst[0] = "0123456789abcdef"[(val >> 4) & 0x0F]; |
| 64 dst[1] = "0123456789abcdef"[val & 0x0F]; |
| 65 } |
| 66 |
| 67 // Display a GUID in canonical form |
| 68 static void emit_guid(char *dst, uint8_t *guid) |
| 69 { |
| 70 one_byte(dst, guid[3]); dst += 2; |
| 71 one_byte(dst, guid[2]); dst += 2; |
| 72 one_byte(dst, guid[1]); dst += 2; |
| 73 one_byte(dst, guid[0]); dst += 2; |
| 74 *dst++ = '-'; |
| 75 one_byte(dst, guid[5]); dst += 2; |
| 76 one_byte(dst, guid[4]); dst += 2; |
| 77 *dst++ = '-'; |
| 78 one_byte(dst, guid[7]); dst += 2; |
| 79 one_byte(dst, guid[6]); dst += 2; |
| 80 *dst++ = '-'; |
| 81 one_byte(dst, guid[8]); dst += 2; |
| 82 one_byte(dst, guid[9]); dst += 2; |
| 83 *dst++ = '-'; |
| 84 one_byte(dst, guid[10]); dst += 2; |
| 85 one_byte(dst, guid[11]); dst += 2; |
| 86 one_byte(dst, guid[12]); dst += 2; |
| 87 one_byte(dst, guid[13]); dst += 2; |
| 88 one_byte(dst, guid[14]); dst += 2; |
| 89 one_byte(dst, guid[15]); dst += 2; |
| 90 } |
| 91 |
| 92 |
47 // Replace any %D with the device letter, and replace any %P with the partition | 93 // Replace any %D with the device letter, and replace any %P with the partition |
48 // number. For example, ("root=/dev/sd%D%P",2,3) gives "root=/dev/sdc3". The | 94 // number. For example, ("root=/dev/sd%D%P",2,3) gives "root=/dev/sdc3". |
49 // input string must be mutable and end with a trailing '\0'. | 95 // Replace any %U with the human-readable form of the GUID (if provided). The |
50 void update_cmdline_inplace(char *src, int devnum, int partnum) | 96 // input string must be mutable and end with a trailing '\0', and have enough |
| 97 // room for all the expansion. |
| 98 static void update_cmdline_inplace(char *src, int devnum, int partnum, |
| 99 uint8_t *guid) |
51 { | 100 { |
52 char *dst; | 101 char *dst; |
53 | 102 |
54 // Use sane values (sda3) for ridiculous inputs. | 103 // Use sane values (sda3) for ridiculous inputs. |
55 if (devnum < 0 || devnum > 25 || partnum < 1 || partnum > 99) | 104 if (devnum < 0 || devnum > 25 || partnum < 1 || partnum > 99) |
56 { | 105 { |
57 devnum = 0; | 106 devnum = 0; |
58 partnum = 3; | 107 partnum = 3; |
59 } | 108 } |
60 | 109 |
61 for( dst = src; *src; src++, dst++ ) | 110 for( dst = src; *src; src++, dst++ ) |
62 { | 111 { |
63 if ( src[0] == '%' ) | 112 if ( src[0] == '%' ) |
64 { | 113 { |
65 switch (src[1]) | 114 switch (src[1]) |
66 { | 115 { |
67 case 'P': | 116 case 'P': |
68 if (partnum > 9) | 117 if (partnum > 9) |
69 *dst++ = '0' + (partnum / 10); | 118 *dst++ = '0' + (partnum / 10); |
70 *dst = '0' + partnum % 10; | 119 *dst = '0' + partnum % 10; |
71 src++; | 120 src++; |
72 break; | 121 break; |
73 case 'D': | 122 case 'D': |
74 *dst = 'a' + devnum; | 123 *dst = 'a' + devnum; |
75 src++; | 124 src++; |
76 break; | 125 break; |
| 126 case 'U': |
| 127 if (guid) { |
| 128 shove_over(src+2, dst+36); |
| 129 emit_guid(dst, guid); |
| 130 src = dst+35; |
| 131 dst += 35; |
| 132 } |
77 default: | 133 default: |
78 *dst = *src; | 134 *dst = *src; |
79 } | 135 } |
80 } | 136 } |
81 else if (dst != src) | 137 else if (dst != src) |
82 *dst = *src; | 138 *dst = *src; |
83 } | 139 } |
84 *dst = '\0'; | 140 *dst = '\0'; |
85 } | 141 } |
86 | 142 |
87 // This is handy to write status codes to the LEDs for debugging. | 143 // This is handy to write status codes to the LEDs for debugging. |
88 static __inline void port80w (unsigned short int value) | 144 static __inline void port80w (unsigned short int value) |
89 { | 145 { |
90 __asm__ __volatile__ ("outw %w0,$0x80": :"a" (value)); | 146 __asm__ __volatile__ ("outw %w0,$0x80": :"a" (value)); |
91 } | 147 } |
92 | 148 |
93 | 149 |
94 // The code to switch to 32-bit mode and start the kernel. | 150 // The code to switch to 32-bit mode and start the kernel. |
95 extern void trampoline(unsigned long, void *); | 151 extern void trampoline(unsigned long, void *); |
96 | 152 |
97 | 153 |
98 // Reserve some space for the EFI memory map. | 154 // Reserve some space for the EFI memory map. |
99 // Danger Will Robinson: this is just a guess at the size and alignment. If | 155 // Danger Will Robinson: this is just a guess at the size and alignment. If |
100 // it's too small, the EFI GetMemoryMap() call will fail. | 156 // it's too small, the EFI GetMemoryMap() call will fail. |
101 // FIXME: Make the size dynamic? Retry with larger size on failure? | 157 // FIXME: Make the size dynamic? Retry with larger size on failure? |
102 static unsigned char mmap_buf[0x2000] __attribute__ ((aligned(0x200))); | 158 static unsigned char mmap_buf[0x2000] __attribute__ ((aligned(0x200))); |
103 | 159 |
104 // Parameters that we're given by the BIOS | 160 // Parameters that we're given by the BIOS |
105 typedef struct cros_boot_info { | 161 typedef struct cros_boot_info { |
106 UINTN drive_number; // 0 - 25 | 162 UINTN drive_number; // 0 - 25 |
107 UINTN partition_number; // 1 - 99 | 163 UINTN partition_number; // 1 - 99 |
108 UINTN original_address; // our RAM address prior to execution | 164 UINTN original_address; // our RAM address prior to execution |
| 165 // The guid stuff was added later, so we need to consider it optional, at |
| 166 // least for testing. |
| 167 uint8_t partition_guid[16]; // kernel partition GUID |
109 } cros_boot_info_t; | 168 } cros_boot_info_t; |
110 | 169 |
111 | 170 |
112 // Here's the entry point. It will be loaded by the BIOS as a standard EFI | 171 // Here's the entry point. It will be loaded by the BIOS as a standard EFI |
113 // application, which means it will be relocated. | 172 // application, which means it will be relocated. |
114 EFI_STATUS efi_main (EFI_HANDLE image, EFI_SYSTEM_TABLE *systab) | 173 EFI_STATUS efi_main (EFI_HANDLE image, EFI_SYSTEM_TABLE *systab) |
115 { | 174 { |
116 UINTN mmap_size = sizeof(mmap_buf); | 175 UINTN mmap_size = sizeof(mmap_buf); |
117 UINTN mmap_key = 0; | 176 UINTN mmap_key = 0; |
118 UINTN desc_size = 0; | 177 UINTN desc_size = 0; |
119 UINT32 desc_version = 0; | 178 UINT32 desc_version = 0; |
120 EFI_LOADED_IMAGE *loaded_image; | 179 EFI_LOADED_IMAGE *loaded_image; |
121 EFI_GUID loaded_image_protocol = LOADED_IMAGE_PROTOCOL; | 180 EFI_GUID loaded_image_protocol = LOADED_IMAGE_PROTOCOL; |
| 181 EFI_GUID zero_guid = {0, 0, 0, {0, 0, 0, 0, 0, 0, 0, 0}}; |
| 182 void *guid_ptr; |
122 | 183 |
123 // I'm here. | 184 // I'm here. |
124 port80w(0xc0de); | 185 port80w(0xc0de); |
125 | 186 |
126 // Find the parameters that the BIOS has passed to us. | 187 // Find the parameters that the BIOS has passed to us. |
127 if (uefi_call_wrapper(systab->BootServices->HandleProtocol, 3, | 188 if (uefi_call_wrapper(systab->BootServices->HandleProtocol, 3, |
128 image, | 189 image, |
129 &loaded_image_protocol, | 190 &loaded_image_protocol, |
130 &loaded_image) != 0) | 191 &loaded_image) != 0) |
131 { | 192 { |
132 uefi_call_wrapper(systab->ConOut->OutputString, 3, systab->ConOut, | 193 uefi_call_wrapper(systab->ConOut->OutputString, 3, systab->ConOut, |
133 L"Can't locate protocol\r\n"); | 194 L"Can't locate protocol\r\n"); |
134 goto fail; | 195 goto fail; |
135 } | 196 } |
136 cros_boot_info_t *booting = loaded_image->LoadOptions; | 197 cros_boot_info_t *booting = loaded_image->LoadOptions; |
| 198 if (loaded_image->LoadOptionsSize < 40) // DWR: min size including guid |
| 199 guid_ptr = &zero_guid; |
| 200 else |
| 201 guid_ptr = booting->partition_guid; |
137 | 202 |
138 // Find the parameters that we're passing to the kernel. | 203 // Find the parameters that we're passing to the kernel. |
139 struct hacked_params *params = find_params_struct(booting->original_address)
; | 204 struct hacked_params *params = find_params_struct(booting->original_address)
; |
140 | 205 |
141 // Update the kernel command-line string with the correct rootfs device | 206 // Update the kernel command-line string with the correct rootfs device |
142 update_cmdline_inplace((char *)(unsigned long)(params->cmd_line_ptr), | 207 update_cmdline_inplace((char *)(unsigned long)(params->cmd_line_ptr), |
143 booting->drive_number, | 208 booting->drive_number, |
144 booting->partition_number + 1); | 209 booting->partition_number + 1, |
| 210 guid_ptr); |
145 | 211 |
146 // Obtain the EFI memory map. | 212 // Obtain the EFI memory map. |
147 if (uefi_call_wrapper(systab->BootServices->GetMemoryMap, 5, | 213 if (uefi_call_wrapper(systab->BootServices->GetMemoryMap, 5, |
148 &mmap_size, mmap_buf, &mmap_key, | 214 &mmap_size, mmap_buf, &mmap_key, |
149 &desc_size, &desc_version) != 0) | 215 &desc_size, &desc_version) != 0) |
150 { | 216 { |
151 uefi_call_wrapper(systab->ConOut->OutputString, 2, systab->ConOut, | 217 uefi_call_wrapper(systab->ConOut->OutputString, 2, systab->ConOut, |
152 L"Can't get memory map\r\n"); | 218 L"Can't get memory map\r\n"); |
153 goto fail; | 219 goto fail; |
154 } | 220 } |
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177 // Trampoline to 32-bit entry point. Should never return. | 243 // Trampoline to 32-bit entry point. Should never return. |
178 trampoline(params->code32_start, params); | 244 trampoline(params->code32_start, params); |
179 | 245 |
180 fail: | 246 fail: |
181 | 247 |
182 // Bad Things happened. | 248 // Bad Things happened. |
183 port80w(0xdead); | 249 port80w(0xdead); |
184 | 250 |
185 return EFI_LOAD_ERROR; | 251 return EFI_LOAD_ERROR; |
186 } | 252 } |
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