wok view linld/stuff/src/TAZBOOT.CPP @ rev 20534

Add util-linux-losetup
author Pascal Bellard <pascal.bellard@slitaz.org>
date Mon Nov 26 09:46:23 2018 +0100 (2018-11-26)
parents f0d71e920c5a
children ab907169f156
line source
1 // This file is distributed under GPL
2 //
3 // TAZBOOT main() lives here
4
5 #include "crtl.h"
6 #include "crtlx.h"
7 #include "common.h"
8 #include "iso9660.h"
9
10 struct initrd_info {
11 u32 ofs;
12 u32 size;
13 };
14 #define MAXINITRD 10
15 static struct initrd_state {
16 struct initrd_info info[MAXINITRD];
17 u16 cnt;
18 } initrd_state;
19
20 static void next_chunk(struct image_himem *m)
21 {
22 struct initrd_info *i = &initrd_state.info[m->state];
23 m->chunk_size = 0;
24 if (m->state >= initrd_state.cnt) return;
25 lseekset(m->fd,i->ofs);
26 m->chunk_size = i->size;
27 m->state++;
28 }
29
30 static u32 isofilesize4round()
31 {
32 return (isofilesize+3)&-4;
33 }
34
35 static void addinitrd()
36 {
37 u16 *pcnt = &initrd_state.cnt;
38 struct initrd_info *i = &initrd_state.info[*pcnt];
39 if (*pcnt >= MAXINITRD) return;
40 ++*pcnt;
41 i->size = isofilesize;
42 i->ofs = isofileofs;
43 initrd.size += isofilesize4round();
44 }
45
46 static void load_initrds()
47 {
48 struct image_himem *m = &initrd;
49 if (!m->size) return;
50 m->next_chunk = next_chunk;
51 m->fd = isofd;
52 m->state = 0;
53 next_chunk(m);
54 load_initrd();
55 }
56
57 static char *isokernel()
58 {
59 struct image_himem *m = &pm;
60 m->chunk_size = m->size = isofilesize4round();
61 m->fd = isofd;
62 return load_kernel();
63 }
64
65 static char buf_cmdline[4096];
66 const char *cmdline = (const char *) buf_cmdline+1;
67 static void bootiso(char **iso)
68 {
69 const char *init = " rdinit=/init.exe", *mode="menu";
70 char c;
71 static char rootfs[16], fallback[16], isknoppix, noauto;
72 int restart;
73 unsigned long magic;
74 struct isostate *x=&isostate;
75
76 if (!*iso || isoreset(*iso) < 0) return;
77 skip_alloc++;
78 base_himem = memtop() /2;
79 //if (base_himem >= _64m) base_himem = _64m;
80 if (* ((char *) &base_himem +3) >= 4) base_himem = _64m;
81 isoopen("boot") >= 0 ||
82 isoopen("live") >= 0 || // debian
83 isoopen("casper") >= 0; // ubuntu
84 if (iso[1] && !strcmp(mode = iso[1], "text"))
85 init = "";
86 do {
87 if ((isoopen(mode) >= 0 && ++noauto != 0) || // custom
88 isoopen("bzImage") >= 0 || // SliTaz
89 isoopen("vmlinuz") >= 0 || // misc
90 (isoopen("linux") >= 0 && ++isknoppix != 0)) {
91 magic = kver2ul(isokernel());
92 break;
93 }
94 } while (isoopen("isolinux") >= 0); // Knoppix
95 for (c = 0, restart = 1; isoreaddir(restart) == 0; restart = 0) {
96 if (strstr(x->filename, ".gz"))
97 strcpy(fallback, x->filename);
98 if (strhead(x->filename, "rootfs")
99 || c > x->filename[6]) continue;
100 strcpy(rootfs, x->filename);
101 c = x->filename[6];
102 }
103
104 strcatb(buf_cmdline,"rw root=/dev/null autologin bootfrom=");
105 strcat(buf_cmdline,*iso);
106 if (magic < 0x20630)
107 init = ""; // Does not support multiple initramfs
108
109 if (noauto) {
110 char *s;
111 * (int *) buf_cmdline = 0;
112 iso++;
113 while ((s = *++iso) != NULL) {
114 if (strhead(s,"initrd="))
115 strcatb(buf_cmdline,s);
116 else if (isoopen(s+7) >= 0)
117 addinitrd();
118 }
119 }
120 else if (magic > 0) {
121 char *initrdfilename = fallback;
122 static const unsigned long initrddesc = 18L;
123
124 if (rootfs[0]) {
125 initrdfilename = rootfs;
126 if (rootfs[6] != '.' && isoopen("rootfs.gz") >= 0)
127 addinitrd(); // for loram
128 }
129 if (isoopen(initrdfilename) >= 0) {
130 addinitrd();
131 }
132 if (*init && isolseek(&initrddesc) != 0) {
133 read(x->fd, &x->filemod, 10); // + x->fileofs & x->filesize
134 magic = x->filemod;
135 x->fileofs &= 0xFFFFL;
136 x->fileofs -= 0xC0L + (x->filesize &= 0xFFFF);
137 if (((short *) &x->fileofs)[1] == 0) addinitrd();
138 else init="";
139 }
140 strcat(buf_cmdline,init);
141 strcatb(buf_cmdline,"mode=");
142 strcat(buf_cmdline,mode);
143 strcatb(buf_cmdline,"magic=");
144 strcat(buf_cmdline,(char *)ultoa(magic));
145 }
146 load_initrds();
147 if (isknoppix) {
148 char *s = *iso;
149 if (s[1] == ':')
150 s += 2;
151 for (; *s; s++)
152 if (*s == '\\') *s = '/';
153 }
154 close(x->fd);
155 boot_kernel();
156 }
157
158 u32 root_dev;
159 u32 vid_mode;
160 u32 topmem;
161 const char* kernel_name = "bzImage";
162 const char* initrd_name;
163 char* iso;
164
165 int main(int argc, char *argv[])
166 {
167 argv[0] = progname();
168 bootiso(argv); // iso ? parsing is /init.exe stuff !
169
170 if (argc < 2) {
171 try_default_args();
172 dousage:
173 die("Usage: tazboot [[@commands]|[-f][-b base_himem][kernel=<bzImage>] \
174 [initrd=<rootfs>[,<rootfs2>...]] [bootfrom=<isofile>] ...]\r\n\n\
175 Defaults: tazboot kernel=bzImage auto\r\n\n\
176 Examples for tazboot.cmd:\r\n\n\
177 bootfrom=\\isos\\slitaz-4.0.iso\r\n\
178 kernel=boot/bzImage\r\n\
179 initrd=boot/rootfs4.gz,boot/rootfs3.gz,boot/rootfs2.gz,boot/rootfs1.gz,\\slitaz\\extrafs.gz\r\n\
180 rw root=/dev/null vga=normal autologin\r\n\n\
181 kernel=\\slitaz\\elks\r\n\
182 root=/dev/bda1 ro\r\n");
183 }
184 bootiso(argv + 1);
185 chdirname(*argv);
186 for (int i=0;;) {
187 char *s;
188 next: argv++;
189 s=*argv;
190 i++;
191 if (!s) break;
192 if (strhead(s,"kernel=") == 0) {
193 s++;
194 set_kernel:
195 s += 6;
196 set_kernelz:
197 kernel_name = s;
198 }
199 else if (strhead(s,"image=") == 0) {
200 goto set_kernel;
201 }
202 else if (strhead(s,"initrd=") == 0) {
203 s += 7;
204 initrd_name = s;
205 }
206 else if (strhead(s,"bootfrom=") == 0) {
207 s += 9;
208 set_iso:
209 iso = s;
210 }
211 else if (strhead(s,"iso=") == 0) {
212 s += 4;
213 goto set_iso;
214 }
215 else if(strhead(s,"vga=") == 0) {
216 s += 4;
217 vid_mode = strtol(s); // support normal, extended & ask
218 }
219 else switch (*(u16 *)s|0x2002) {
220 case 0x662F: // -F /f
221 skip_alloc++;
222 goto next;
223 case 0x652F: // -E /e
224 argv++;
225 topmem = strtol(*argv);
226 goto next;
227 case 0x622F: // -B /b
228 argv++;
229 base_himem = strtol(*argv);
230 goto next;
231 default:
232 if(i == 1 && fileattr(s) != -1) {
233 goto set_kernelz;
234 }
235 else {
236 if(strhead(s,"root=") == 0) {
237 s += 5;
238 root_dev = strtol(s);
239 }
240 if(strhead(s,"mem=") == 0) {
241 s += 4;
242 topmem = strtol(s);
243 }
244 strcatb(buf_cmdline,*argv);
245 }}
246 }
247 if (iso && isoreset(iso) >= 0) {
248 char *s = (char *) initrd_name;
249 if (isoopen((char *) kernel_name) >= 0) {
250 isokernel();
251 }
252 if (s) {
253 while (*s) {
254 char *p, c;
255 for (p = s; *s && *s != ','; s++);
256 c = *s; *s = 0;
257 if (isoopen(p) >= 0) {
258 addinitrd();
259 }
260 *s = c;
261 if (c) s++;
262 }
263 load_initrds();
264 }
265 }
266 else {
267 load_kernel();
268 load_initrd();
269 }
270 boot_kernel();
271 return _AX;
272 }