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-rw-r--r--arch/powerpc/boot/main.c321
1 files changed, 321 insertions, 0 deletions
diff --git a/arch/powerpc/boot/main.c b/arch/powerpc/boot/main.c
new file mode 100644
index 000000000000..64ec93116fa6
--- /dev/null
+++ b/arch/powerpc/boot/main.c
@@ -0,0 +1,321 @@
1/*
2 * Copyright (C) Paul Mackerras 1997.
3 *
4 * Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11#include <stdarg.h>
12#include <stddef.h>
13#include "elf.h"
14#include "page.h"
15#include "string.h"
16#include "stdio.h"
17#include "prom.h"
18#include "zlib.h"
19
20extern void flush_cache(void *, unsigned long);
21
22
23/* Value picked to match that used by yaboot */
24#define PROG_START 0x01400000
25#define RAM_END (512<<20) // Fixme: use OF */
26#define ONE_MB 0x100000
27
28extern char _start[];
29extern char __bss_start[];
30extern char _end[];
31extern char _vmlinux_start[];
32extern char _vmlinux_end[];
33extern char _initrd_start[];
34extern char _initrd_end[];
35
36struct addr_range {
37 unsigned long addr;
38 unsigned long size;
39 unsigned long memsize;
40};
41static struct addr_range vmlinux;
42static struct addr_range vmlinuz;
43static struct addr_range initrd;
44
45static unsigned long elfoffset;
46
47static char scratch[46912]; /* scratch space for gunzip, from zlib_inflate_workspacesize() */
48static char elfheader[256];
49
50
51typedef void (*kernel_entry_t)( unsigned long,
52 unsigned long,
53 void *,
54 void *);
55
56
57#undef DEBUG
58
59static unsigned long claim_base;
60
61#define HEAD_CRC 2
62#define EXTRA_FIELD 4
63#define ORIG_NAME 8
64#define COMMENT 0x10
65#define RESERVED 0xe0
66
67static void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
68{
69 z_stream s;
70 int r, i, flags;
71
72 /* skip header */
73 i = 10;
74 flags = src[3];
75 if (src[2] != Z_DEFLATED || (flags & RESERVED) != 0) {
76 printf("bad gzipped data\n\r");
77 exit();
78 }
79 if ((flags & EXTRA_FIELD) != 0)
80 i = 12 + src[10] + (src[11] << 8);
81 if ((flags & ORIG_NAME) != 0)
82 while (src[i++] != 0)
83 ;
84 if ((flags & COMMENT) != 0)
85 while (src[i++] != 0)
86 ;
87 if ((flags & HEAD_CRC) != 0)
88 i += 2;
89 if (i >= *lenp) {
90 printf("gunzip: ran out of data in header\n\r");
91 exit();
92 }
93
94 if (zlib_inflate_workspacesize() > sizeof(scratch)) {
95 printf("gunzip needs more mem\n");
96 exit();
97 }
98 memset(&s, 0, sizeof(s));
99 s.workspace = scratch;
100 r = zlib_inflateInit2(&s, -MAX_WBITS);
101 if (r != Z_OK) {
102 printf("inflateInit2 returned %d\n\r", r);
103 exit();
104 }
105 s.next_in = src + i;
106 s.avail_in = *lenp - i;
107 s.next_out = dst;
108 s.avail_out = dstlen;
109 r = zlib_inflate(&s, Z_FULL_FLUSH);
110 if (r != Z_OK && r != Z_STREAM_END) {
111 printf("inflate returned %d msg: %s\n\r", r, s.msg);
112 exit();
113 }
114 *lenp = s.next_out - (unsigned char *) dst;
115 zlib_inflateEnd(&s);
116}
117
118static unsigned long try_claim(unsigned long size)
119{
120 unsigned long addr = 0;
121
122 for(; claim_base < RAM_END; claim_base += ONE_MB) {
123#ifdef DEBUG
124 printf(" trying: 0x%08lx\n\r", claim_base);
125#endif
126 addr = (unsigned long)claim(claim_base, size, 0);
127 if ((void *)addr != (void *)-1)
128 break;
129 }
130 if (addr == 0)
131 return 0;
132 claim_base = PAGE_ALIGN(claim_base + size);
133 return addr;
134}
135
136static int is_elf64(void *hdr)
137{
138 Elf64_Ehdr *elf64 = hdr;
139 Elf64_Phdr *elf64ph;
140 unsigned int i;
141
142 if (!(elf64->e_ident[EI_MAG0] == ELFMAG0 &&
143 elf64->e_ident[EI_MAG1] == ELFMAG1 &&
144 elf64->e_ident[EI_MAG2] == ELFMAG2 &&
145 elf64->e_ident[EI_MAG3] == ELFMAG3 &&
146 elf64->e_ident[EI_CLASS] == ELFCLASS64 &&
147 elf64->e_ident[EI_DATA] == ELFDATA2MSB &&
148 elf64->e_type == ET_EXEC &&
149 elf64->e_machine == EM_PPC64))
150 return 0;
151
152 elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
153 (unsigned long)elf64->e_phoff);
154 for (i = 0; i < (unsigned int)elf64->e_phnum; i++, elf64ph++)
155 if (elf64ph->p_type == PT_LOAD && elf64ph->p_offset != 0)
156 break;
157 if (i >= (unsigned int)elf64->e_phnum)
158 return 0;
159
160 elfoffset = (unsigned long)elf64ph->p_offset;
161 vmlinux.size = (unsigned long)elf64ph->p_filesz + elfoffset;
162 vmlinux.memsize = (unsigned long)elf64ph->p_memsz + elfoffset;
163 return 1;
164}
165
166static int is_elf32(void *hdr)
167{
168 Elf32_Ehdr *elf32 = hdr;
169 Elf32_Phdr *elf32ph;
170 unsigned int i;
171
172 if (!(elf32->e_ident[EI_MAG0] == ELFMAG0 &&
173 elf32->e_ident[EI_MAG1] == ELFMAG1 &&
174 elf32->e_ident[EI_MAG2] == ELFMAG2 &&
175 elf32->e_ident[EI_MAG3] == ELFMAG3 &&
176 elf32->e_ident[EI_CLASS] == ELFCLASS32 &&
177 elf32->e_ident[EI_DATA] == ELFDATA2MSB &&
178 elf32->e_type == ET_EXEC &&
179 elf32->e_machine == EM_PPC))
180 return 0;
181
182 elf32 = (Elf32_Ehdr *)elfheader;
183 elf32ph = (Elf32_Phdr *) ((unsigned long)elf32 + elf32->e_phoff);
184 for (i = 0; i < elf32->e_phnum; i++, elf32ph++)
185 if (elf32ph->p_type == PT_LOAD && elf32ph->p_offset != 0)
186 break;
187 if (i >= elf32->e_phnum)
188 return 0;
189
190 elfoffset = elf32ph->p_offset;
191 vmlinux.size = elf32ph->p_filesz + elf32ph->p_offset;
192 vmlinux.memsize = elf32ph->p_memsz + elf32ph->p_offset;
193 return 1;
194}
195
196void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
197{
198 int len;
199 kernel_entry_t kernel_entry;
200
201 memset(__bss_start, 0, _end - __bss_start);
202
203 prom = (int (*)(void *)) promptr;
204 chosen_handle = finddevice("/chosen");
205 if (chosen_handle == (void *) -1)
206 exit();
207 if (getprop(chosen_handle, "stdout", &stdout, sizeof(stdout)) != 4)
208 exit();
209 stderr = stdout;
210 if (getprop(chosen_handle, "stdin", &stdin, sizeof(stdin)) != 4)
211 exit();
212
213 printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r", _start, sp);
214
215 vmlinuz.addr = (unsigned long)_vmlinux_start;
216 vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
217
218 /* gunzip the ELF header of the kernel */
219 if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
220 len = vmlinuz.size;
221 gunzip(elfheader, sizeof(elfheader),
222 (unsigned char *)vmlinuz.addr, &len);
223 } else
224 memcpy(elfheader, (const void *)vmlinuz.addr, sizeof(elfheader));
225
226 if (!is_elf64(elfheader) && !is_elf32(elfheader)) {
227 printf("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
228 exit();
229 }
230
231 /*
232 * The first available claim_base must be above the end of the
233 * the loaded kernel wrapper file (_start to _end includes the
234 * initrd image if it is present) and rounded up to a nice
235 * 1 MB boundary for good measure.
236 */
237
238 claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
239
240#if defined(PROG_START)
241 /*
242 * Maintain a "magic" minimum address. This keeps some older
243 * firmware platforms running.
244 */
245
246 if (claim_base < PROG_START)
247 claim_base = PROG_START;
248#endif
249
250 /* We need to claim the memsize plus the file offset since gzip
251 * will expand the header (file offset), then the kernel, then
252 * possible rubbish we don't care about. But the kernel bss must
253 * be claimed (it will be zero'd by the kernel itself)
254 */
255 printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux.memsize);
256 vmlinux.addr = try_claim(vmlinux.memsize);
257 if (vmlinux.addr == 0) {
258 printf("Can't allocate memory for kernel image !\n\r");
259 exit();
260 }
261
262 /*
263 * Now we try to claim memory for the initrd (and copy it there)
264 */
265 initrd.size = (unsigned long)(_initrd_end - _initrd_start);
266 initrd.memsize = initrd.size;
267 if ( initrd.size > 0 ) {
268 printf("Allocating 0x%lx bytes for initrd ...\n\r", initrd.size);
269 initrd.addr = try_claim(initrd.size);
270 if (initrd.addr == 0) {
271 printf("Can't allocate memory for initial ramdisk !\n\r");
272 exit();
273 }
274 a1 = initrd.addr;
275 a2 = initrd.size;
276 printf("initial ramdisk moving 0x%lx <- 0x%lx (0x%lx bytes)\n\r",
277 initrd.addr, (unsigned long)_initrd_start, initrd.size);
278 memmove((void *)initrd.addr, (void *)_initrd_start, initrd.size);
279 printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd.addr));
280 }
281
282 /* Eventually gunzip the kernel */
283 if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
284 printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
285 vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
286 len = vmlinuz.size;
287 gunzip((void *)vmlinux.addr, vmlinux.memsize,
288 (unsigned char *)vmlinuz.addr, &len);
289 printf("done 0x%lx bytes\n\r", len);
290 } else {
291 memmove((void *)vmlinux.addr,(void *)vmlinuz.addr,vmlinuz.size);
292 }
293
294 /* Skip over the ELF header */
295#ifdef DEBUG
296 printf("... skipping 0x%lx bytes of ELF header\n\r",
297 elfoffset);
298#endif
299 vmlinux.addr += elfoffset;
300
301 flush_cache((void *)vmlinux.addr, vmlinux.size);
302
303 kernel_entry = (kernel_entry_t)vmlinux.addr;
304#ifdef DEBUG
305 printf( "kernel:\n\r"
306 " entry addr = 0x%lx\n\r"
307 " a1 = 0x%lx,\n\r"
308 " a2 = 0x%lx,\n\r"
309 " prom = 0x%lx,\n\r"
310 " bi_recs = 0x%lx,\n\r",
311 (unsigned long)kernel_entry, a1, a2,
312 (unsigned long)prom, NULL);
313#endif
314
315 kernel_entry(a1, a2, prom, NULL);
316
317 printf("Error: Linux kernel returned to zImage bootloader!\n\r");
318
319 exit();
320}
321
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