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Root/branches/meklort/i386/boot2/ramdisk.c

Source at commit 252 created 2 years 9 months ago.
By meklort, Make md0 image user selectable. Falls back to Postboot.img, take 2
1/*␊
2 * Supplemental ramdisk functions for the multiboot ramdisk driver.␊
3 * Copyright 2009 Tamas Kosarszky. All rights reserved.␊
4 *␊
5 */␊
6␊
7#include "boot.h"␊
8#include "bootstruct.h"␊
9#include "multiboot.h"␊
10#include "ramdisk.h"␊
11␊
12struct multiboot_info * gRAMDiskMI = NULL;␊
13␊
14// gRAMDiskVolume holds the bvr for the mounted ramdisk image.␊
15BVRef gRAMDiskVolume = NULL;␊
16bool gRAMDiskBTAliased = false;␊
17char gRAMDiskFile[512];␊
18␊
19␊
20// Notify OS X that a ramdisk has been setup. XNU with attach this to /dev/md0␊
21void md0Ramdisk()␊
22{␊
23␉RAMDiskParam ramdiskPtr;␊
24␉char filename[512];␊
25␉const char* override_filename = 0;␊
26␉int fh = -1;␊
27␉int len;␊
28␉␊
29␉if(getValueForKey(kMD0Image, &override_filename, &len, ␊
30␉␉␉␉ &bootInfo->bootConfig))␊
31␉{␊
32␉␉// Use user specified md0 file␊
33␉␉sprintf(filename, "%s", override_filename);␊
34␉␉fh = open(filename, 0);␊
35␉␉␊
36␉␉if(fh < 0)␊
37␉␉{␊
38␉␉␉sprintf(filename, "rd(0,0)/Extra/%s", override_filename);␊
39␉␉␉if((fh = open(filename, 0)) < 0)␊
40␉␉␉{␊
41␉␉␉␉sprintf(filename, "/Extra/%s", override_filename);␊
42␉␉␉␉fh = open(filename, 0);␊
43␉␉␉␉␊
44␉␉␉}␊
45␉␉}␉␉␊
46␉}␊
47␉␊
48␉␊
49␉if(fh < 0)␊
50␉{␊
51␉␉// Fallback to Postboot.img␊
52␉␉sprintf(filename, "rd(0,0)/Extra/Postboot.img");␊
53␉␉fh = open(filename, 0);␊
54␉␉if(fh < 0)␊
55␉␉{␊
56␉␉␉sprintf(filename, "/Extra/Postboot.img");␉// Check /Extra if not in rd(0,0)␊
57␉␉␉fh = open(filename, 0);␊
58␉␉␉␊
59␉␉}␊
60␉}␉␉␊
61␉␊
62␉if (fh >= 0)␊
63␉{␊
64␉␉verbose("Enabling ramdisk %s\n", filename);␊
65␊
66␉␉ramdiskPtr.size = file_size(fh);␊
67␉␉ramdiskPtr.base = AllocateKernelMemory(ramdiskPtr.size);␊
68␉␉␊
69␉␉if(ramdiskPtr.size && ramdiskPtr.base)␊
70␉␉{␊
71␉␉␉// Read new ramdisk image contents in kernel memory.␊
72␉␉␉if (read(fh, (char*) ramdiskPtr.base, ramdiskPtr.size) == ramdiskPtr.size)␊
73␉␉␉{␊
74␉␉␉␉AllocateMemoryRange("RAMDisk", ramdiskPtr.base, ramdiskPtr.size, kBootDriverTypeInvalid);␊
75␉␉␉␉Node* node = DT__FindNode("/chosen/memory-map", false);␊
76␉␉␉␉if(node != NULL)␊
77␉␉␉␉{␊
78␉␉␉␉␉DT__AddProperty(node, "RAMDisk", sizeof(RAMDiskParam), (void*)&ramdiskPtr);␉␉␊
79␉␉␉␉␉␊
80␉␉␉␉}␊
81␉␉␉␉else␊
82␉␉␉␉{␊
83␉␉␉␉␉verbose("Unable to notify Mac OS X of the ramdisk %s.\n", filename);␊
84␉␉␉␉}␊
85␉␉␉␉␊
86␉␉␉}␊
87␉␉␉else {␊
88␉␉␉␉verbose("Unable to read md0 image %s.\n", filename);␊
89␉␉␉}␊
90␉␉␉␊
91␉␉} else {␊
92␉␉␉verbose("md0 image %s is empty.\n", filename);␊
93␉␉}␊
94␉␉␊
95␉␉␊
96␉␉close(fh);␊
97␉␉␊
98␉}␊
99}␊
100␊
101␊
102void umountRAMDisk()␊
103{␊
104 if (gRAMDiskMI != NULL)␊
105 {␊
106 // Release ramdisk BVRef and DiskBVMap.␊
107 struct DiskBVMap *oldMap = diskResetBootVolumes(0x100);␊
108 CacheReset();␊
109 diskFreeMap(oldMap);␊
110 ␊
111 // Free multiboot info and module structures.␊
112 if ((void *)gRAMDiskMI->mi_mods_addr != NULL) free((void *)gRAMDiskMI->mi_mods_addr);␊
113 if (gRAMDiskMI != NULL) free(gRAMDiskMI);␊
114 ␊
115 // Reset multiboot structures.␊
116 gMI = gRAMDiskMI = NULL;␊
117 *gRAMDiskFile = '\0';␊
118␊
119 // Release ramdisk driver hooks.␊
120 p_get_ramdisk_info = NULL;␊
121 p_ramdiskReadBytes = NULL;␊
122 ␊
123 printf("\nunmounting: done");␊
124 }␊
125}␊
126␊
127int mountRAMDisk(const char * param)␊
128{␊
129 int fh = 0, ramDiskSize;␊
130 int error = 0;␊
131␊
132 // Get file handle for ramdisk file.␊
133 fh = open(param, 0);␊
134 if (fh != -1)␊
135 {␊
136␉printf("\nreading ramdisk image: %s", param);␊
137␊
138␉ramDiskSize = file_size(fh);␊
139 if (ramDiskSize > 0)␊
140 {␊
141 // Unmount previously mounted image if exists.␊
142 umountRAMDisk();␊
143 ␊
144 // Read new ramdisk image contents into PREBOOT_DATA area.␊
145 if (read(fh, (char *)PREBOOT_DATA, ramDiskSize) != ramDiskSize) error = -1;␊
146 }␊
147 else error = -1;␊
148␊
149 close(fh);␊
150 }␊
151 else error = -1;␊
152 ␊
153 if (error == 0)␊
154 {␊
155 // Save filename in gRAMDiskFile to display information.␊
156 strcpy(gRAMDiskFile, param);␊
157␊
158 // Set gMI as well for the multiboot ramdisk driver hook.␊
159 gMI = gRAMDiskMI = malloc(sizeof(multiboot_info));␊
160 struct multiboot_module * ramdisk_module = malloc(sizeof(multiboot_module));␊
161 ␊
162 // Fill in multiboot info and module structures.␊
163 if (gRAMDiskMI != NULL && ramdisk_module != NULL)␊
164 {␊
165 gRAMDiskMI->mi_mods_count = 1;␊
166 gRAMDiskMI->mi_mods_addr = (uint32_t)ramdisk_module;␊
167 ramdisk_module->mm_mod_start = PREBOOT_DATA;␊
168 ramdisk_module->mm_mod_end = PREBOOT_DATA + ramDiskSize;␊
169 ␊
170 // Set ramdisk driver hooks.␊
171 p_get_ramdisk_info = &multiboot_get_ramdisk_info;␊
172 p_ramdiskReadBytes = &multibootRamdiskReadBytes;␊
173 ␊
174 int partCount; // unused␊
175 // Save bvr of the mounted image.␊
176 gRAMDiskVolume = diskScanBootVolumes(0x100, &partCount);␊
177 if(gRAMDiskVolume == NULL)␊
178 {␊
179 umountRAMDisk();␊
180 printf("\nRamdisk contains no partitions.");␊
181 }␊
182 else␊
183 {␊
184 char dirSpec[128];␊
185␊
186 // Reading ramdisk configuration.␊
187 strcpy(dirSpec, RAMDISKCONFIG_FILENAME);␊
188 ␊
189 if (loadConfigFile(dirSpec, &bootInfo->ramdiskConfig) == 0)␊
190 {␊
191 getBoolForKey("BTAlias", &gRAMDiskBTAliased, &bootInfo->ramdiskConfig);␊
192 }␊
193 else␊
194 {␊
195 printf("\nno ramdisk config...\n");␊
196 }␊
197 ␊
198 printf("\nmounting: done");␊
199 }␊
200 }␊
201␊
202 }␊
203 ␊
204 return error;␊
205}␊
206␊
207void setRAMDiskBTHook(bool mode)␊
208{␊
209 gRAMDiskBTAliased = mode;␊
210 if (mode) {␊
211 printf("\nEnabled bt(0,0) alias.");␊
212 } else {␊
213 printf("\nDisabled bt(0,0) alias.");␊
214 }␊
215}␊
216␊
217void showInfoRAMDisk(void)␊
218{␊
219 int len;␊
220 const char *val;␊
221␊
222 if (gRAMDiskMI != NULL)␊
223 {␊
224 struct multiboot_module * ramdisk_module = (void *)gRAMDiskMI->mi_mods_addr;␊
225␊
226 printf("\nfile: %s %d", gRAMDiskFile,␊
227 ramdisk_module->mm_mod_end - ramdisk_module->mm_mod_start);␊
228 printf("\nalias: %s", gRAMDiskBTAliased ? "enabled" : "disabled");␊
229␊
230 // Display ramdisk information if available.␊
231␊
232 if (getValueForKey("Info", &val, &len, &bootInfo->ramdiskConfig))␊
233 printf("\ninfo: %s", val);␊
234 else␊
235 printf("\nramdisk info not available.");␊
236␊
237 }␊
238 else␊
239 {␊
240 printf("\nNo ramdisk mounted.");␊
241 }␊
242}␊
243␊
244int loadPrebootRAMDisk()␊
245{␊
246 mountRAMDisk("bt(0,0)/Extra/Preboot.dmg");␊
247 if (gRAMDiskMI != NULL)␊
248 {␊
249 printf("\n");␊
250 return 0;␊
251 }␊
252 else␊
253 {␊
254 return -1;␊
255 }␊
256}␊
257␊
258void processRAMDiskCommand(char ** argPtr, const char * cmd)␊
259{␊
260 char * ptr = *argPtr;␊
261 char param[1024];␊
262 getNextArg(&ptr, param);␊
263 ␊
264 if (strcmp(cmd, "m") == 0)␊
265 {␊
266 mountRAMDisk(param);␊
267 sleep(2);␊
268 }␊
269 else if (strcmp(cmd, "u") == 0)␊
270 {␊
271 umountRAMDisk();␊
272 sleep(2);␊
273 }␊
274 else if (strcmp(cmd, "e") == 0)␊
275 {␊
276 setRAMDiskBTHook(1);␊
277 sleep(2);␊
278 }␊
279 else if (strcmp(cmd, "d") == 0)␊
280 {␊
281 setRAMDiskBTHook(0);␊
282 sleep(2);␊
283 }␊
284 else if (strcmp(cmd, "i") == 0)␊
285 {␊
286 setActiveDisplayPage(1);␊
287 clearScreenRows(0, 24);␊
288 setCursorPosition(0, 0, 1);␊
289 showInfoRAMDisk();␊
290 printf("\n\nPress any key to continue.\n");␊
291 getc();␊
292 setActiveDisplayPage(0);␊
293 }␊
294 else␊
295 {␊
296 setActiveDisplayPage(1);␊
297 clearScreenRows(0, 24);␊
298 setCursorPosition(0, 0, 1);␊
299 printf("\nusage:\n");␊
300 printf("\n?rd i - display ramdisk information");␊
301 printf("\n?rd m <filename> - mount ramdisk image\n?rd u - unmount ramdisk image");␊
302 printf("\n?rd e - enable bt(0,0) alias\n?rd d - disable bt(0,0) alias");␊
303 printf("\n\nPress any key to continue.\n");␊
304 getc();␊
305 setActiveDisplayPage(0);␊
306 }␊
307}␊
308

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