Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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 "ppc32-types.h"
12#include "zlib.h"
13#include <linux/elf.h>
14#include <linux/string.h>
15#include <asm/processor.h>
16#include <asm/page.h>
17
18extern void *finddevice(const char *);
19extern int getprop(void *, const char *, void *, int);
20extern void printk(char *fmt, ...);
21extern void printf(const char *fmt, ...);
22extern int sprintf(char *buf, const char *fmt, ...);
23void gunzip(void *, int, unsigned char *, int *);
24void *claim(unsigned int, unsigned int, unsigned int);
25void flush_cache(void *, unsigned long);
26void pause(void);
27extern void exit(void);
28
29unsigned long strlen(const char *s);
30void *memmove(void *dest, const void *src, unsigned long n);
31void *memcpy(void *dest, const void *src, unsigned long n);
32
33/* Value picked to match that used by yaboot */
34#define PROG_START 0x01400000
35#define RAM_END (256<<20) // Fixme: use OF */
36
37char *avail_ram;
38char *begin_avail, *end_avail;
39char *avail_high;
40unsigned int heap_use;
41unsigned int heap_max;
42
43extern char _start[];
44extern char _vmlinux_start[];
45extern char _vmlinux_end[];
46extern char _initrd_start[];
47extern char _initrd_end[];
48extern unsigned long vmlinux_filesize;
49extern unsigned long vmlinux_memsize;
50
51struct addr_range {
52 unsigned long addr;
53 unsigned long size;
54 unsigned long memsize;
55};
56struct addr_range vmlinux = {0, 0, 0};
57struct addr_range vmlinuz = {0, 0, 0};
58struct addr_range initrd = {0, 0, 0};
59
60static char scratch[128<<10]; /* 128kB of scratch space for gunzip */
61
62typedef void (*kernel_entry_t)( unsigned long,
63 unsigned long,
64 void *,
65 void *);
66
67
68int (*prom)(void *);
69
70void *chosen_handle;
71void *stdin;
72void *stdout;
73void *stderr;
74
75#undef DEBUG
76
77static unsigned long claim_base = PROG_START;
78
79static unsigned long try_claim(unsigned long size)
80{
81 unsigned long addr = 0;
82
83 for(; claim_base < RAM_END; claim_base += 0x100000) {
84#ifdef DEBUG
85 printf(" trying: 0x%08lx\n\r", claim_base);
86#endif
87 addr = (unsigned long)claim(claim_base, size, 0);
88 if ((void *)addr != (void *)-1)
89 break;
90 }
91 if (addr == 0)
92 return 0;
93 claim_base = PAGE_ALIGN(claim_base + size);
94 return addr;
95}
96
97void start(unsigned long a1, unsigned long a2, void *promptr)
98{
99 unsigned long i;
100 kernel_entry_t kernel_entry;
101 Elf64_Ehdr *elf64;
102 Elf64_Phdr *elf64ph;
103
104 prom = (int (*)(void *)) promptr;
105 chosen_handle = finddevice("/chosen");
106 if (chosen_handle == (void *) -1)
107 exit();
108 if (getprop(chosen_handle, "stdout", &stdout, sizeof(stdout)) != 4)
109 exit();
110 stderr = stdout;
111 if (getprop(chosen_handle, "stdin", &stdin, sizeof(stdin)) != 4)
112 exit();
113
114 printf("\n\rzImage starting: loaded at 0x%x\n\r", (unsigned)_start);
115
116 /*
117 * Now we try to claim some memory for the kernel itself
118 * our "vmlinux_memsize" is the memory footprint in RAM, _HOWEVER_, what
119 * our Makefile stuffs in is an image containing all sort of junk including
120 * an ELF header. We need to do some calculations here to find the right
121 * size... In practice we add 1Mb, that is enough, but we should really
122 * consider fixing the Makefile to put a _raw_ kernel in there !
123 */
124 vmlinux_memsize += 0x100000;
125 printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux_memsize);
126 vmlinux.addr = try_claim(vmlinux_memsize);
127 if (vmlinux.addr == 0) {
128 printf("Can't allocate memory for kernel image !\n\r");
129 exit();
130 }
131 vmlinuz.addr = (unsigned long)_vmlinux_start;
132 vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
133 vmlinux.size = PAGE_ALIGN(vmlinux_filesize);
134 vmlinux.memsize = vmlinux_memsize;
135
136 /*
137 * Now we try to claim memory for the initrd (and copy it there)
138 */
139 initrd.size = (unsigned long)(_initrd_end - _initrd_start);
140 initrd.memsize = initrd.size;
141 if ( initrd.size > 0 ) {
142 printf("Allocating 0x%lx bytes for initrd ...\n\r", initrd.size);
143 initrd.addr = try_claim(initrd.size);
144 if (initrd.addr == 0) {
145 printf("Can't allocate memory for initial ramdisk !\n\r");
146 exit();
147 }
148 a1 = initrd.addr;
149 a2 = initrd.size;
150 printf("initial ramdisk moving 0x%lx <- 0x%lx (%lx bytes)\n\r",
151 initrd.addr, (unsigned long)_initrd_start, initrd.size);
152 memmove((void *)initrd.addr, (void *)_initrd_start, initrd.size);
153 printf("initrd head: 0x%lx\n\r", *((u32 *)initrd.addr));
154 }
155
156 /* Eventually gunzip the kernel */
157 if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
158 int len;
159 avail_ram = scratch;
160 begin_avail = avail_high = avail_ram;
161 end_avail = scratch + sizeof(scratch);
162 printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
163 vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
164 len = vmlinuz.size;
165 gunzip((void *)vmlinux.addr, vmlinux.size,
166 (unsigned char *)vmlinuz.addr, &len);
167 printf("done 0x%lx bytes\n\r", len);
168 printf("0x%x bytes of heap consumed, max in use 0x%x\n\r",
169 (unsigned)(avail_high - begin_avail), heap_max);
170 } else {
171 memmove((void *)vmlinux.addr,(void *)vmlinuz.addr,vmlinuz.size);
172 }
173
174 /* Skip over the ELF header */
175 elf64 = (Elf64_Ehdr *)vmlinux.addr;
176 if ( elf64->e_ident[EI_MAG0] != ELFMAG0 ||
177 elf64->e_ident[EI_MAG1] != ELFMAG1 ||
178 elf64->e_ident[EI_MAG2] != ELFMAG2 ||
179 elf64->e_ident[EI_MAG3] != ELFMAG3 ||
180 elf64->e_ident[EI_CLASS] != ELFCLASS64 ||
181 elf64->e_ident[EI_DATA] != ELFDATA2MSB ||
182 elf64->e_type != ET_EXEC ||
183 elf64->e_machine != EM_PPC64 )
184 {
185 printf("Error: not a valid PPC64 ELF file!\n\r");
186 exit();
187 }
188
189 elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
190 (unsigned long)elf64->e_phoff);
191 for(i=0; i < (unsigned int)elf64->e_phnum ;i++,elf64ph++) {
192 if (elf64ph->p_type == PT_LOAD && elf64ph->p_offset != 0)
193 break;
194 }
195#ifdef DEBUG
196 printf("... skipping 0x%lx bytes of ELF header\n\r",
197 (unsigned long)elf64ph->p_offset);
198#endif
199 vmlinux.addr += (unsigned long)elf64ph->p_offset;
200 vmlinux.size -= (unsigned long)elf64ph->p_offset;
201
202 flush_cache((void *)vmlinux.addr, vmlinux.size);
203
204 if (a1)
205 printf("initrd head: 0x%lx\n\r", *((u32 *)initrd.addr));
206
207 kernel_entry = (kernel_entry_t)vmlinux.addr;
208#ifdef DEBUG
209 printf( "kernel:\n\r"
210 " entry addr = 0x%lx\n\r"
211 " a1 = 0x%lx,\n\r"
212 " a2 = 0x%lx,\n\r"
213 " prom = 0x%lx,\n\r"
214 " bi_recs = 0x%lx,\n\r",
215 (unsigned long)kernel_entry, a1, a2,
216 (unsigned long)prom, NULL);
217#endif
218
219 kernel_entry( a1, a2, prom, NULL );
220
221 printf("Error: Linux kernel returned to zImage bootloader!\n\r");
222
223 exit();
224}
225
226struct memchunk {
227 unsigned int size;
228 unsigned int pad;
229 struct memchunk *next;
230};
231
232static struct memchunk *freechunks;
233
234void *zalloc(void *x, unsigned items, unsigned size)
235{
236 void *p;
237 struct memchunk **mpp, *mp;
238
239 size *= items;
240 size = _ALIGN(size, sizeof(struct memchunk));
241 heap_use += size;
242 if (heap_use > heap_max)
243 heap_max = heap_use;
244 for (mpp = &freechunks; (mp = *mpp) != 0; mpp = &mp->next) {
245 if (mp->size == size) {
246 *mpp = mp->next;
247 return mp;
248 }
249 }
250 p = avail_ram;
251 avail_ram += size;
252 if (avail_ram > avail_high)
253 avail_high = avail_ram;
254 if (avail_ram > end_avail) {
255 printf("oops... out of memory\n\r");
256 pause();
257 }
258 return p;
259}
260
261void zfree(void *x, void *addr, unsigned nb)
262{
263 struct memchunk *mp = addr;
264
265 nb = _ALIGN(nb, sizeof(struct memchunk));
266 heap_use -= nb;
267 if (avail_ram == addr + nb) {
268 avail_ram = addr;
269 return;
270 }
271 mp->size = nb;
272 mp->next = freechunks;
273 freechunks = mp;
274}
275
276#define HEAD_CRC 2
277#define EXTRA_FIELD 4
278#define ORIG_NAME 8
279#define COMMENT 0x10
280#define RESERVED 0xe0
281
282#define DEFLATED 8
283
284void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
285{
286 z_stream s;
287 int r, i, flags;
288
289 /* skip header */
290 i = 10;
291 flags = src[3];
292 if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
293 printf("bad gzipped data\n\r");
294 exit();
295 }
296 if ((flags & EXTRA_FIELD) != 0)
297 i = 12 + src[10] + (src[11] << 8);
298 if ((flags & ORIG_NAME) != 0)
299 while (src[i++] != 0)
300 ;
301 if ((flags & COMMENT) != 0)
302 while (src[i++] != 0)
303 ;
304 if ((flags & HEAD_CRC) != 0)
305 i += 2;
306 if (i >= *lenp) {
307 printf("gunzip: ran out of data in header\n\r");
308 exit();
309 }
310
311 s.zalloc = zalloc;
312 s.zfree = zfree;
313 r = inflateInit2(&s, -MAX_WBITS);
314 if (r != Z_OK) {
315 printf("inflateInit2 returned %d\n\r", r);
316 exit();
317 }
318 s.next_in = src + i;
319 s.avail_in = *lenp - i;
320 s.next_out = dst;
321 s.avail_out = dstlen;
322 r = inflate(&s, Z_FINISH);
323 if (r != Z_OK && r != Z_STREAM_END) {
324 printf("inflate returned %d msg: %s\n\r", r, s.msg);
325 exit();
326 }
327 *lenp = s.next_out - (unsigned char *) dst;
328 inflateEnd(&s);
329}
330