2 * Copyright (C) Paul Mackerras 1997.
4 * Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner.
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.
11 #include "ppc32-types.h"
13 #include <linux/elf.h>
14 #include <linux/string.h>
15 #include <asm/processor.h>
18 extern void *finddevice(const char *);
19 extern int getprop(void *, const char *, void *, int);
20 extern void printf(const char *fmt, ...);
21 extern int sprintf(char *buf, const char *fmt, ...);
22 void gunzip(void *, int, unsigned char *, int *);
23 void *claim(unsigned int, unsigned int, unsigned int);
24 void flush_cache(void *, unsigned long);
26 extern void exit(void);
28 unsigned long strlen(const char *s);
29 void *memmove(void *dest, const void *src, unsigned long n);
30 void *memcpy(void *dest, const void *src, unsigned long n);
32 /* Value picked to match that used by yaboot */
33 #define PROG_START 0x01400000
34 #define RAM_END (256<<20) // Fixme: use OF */
37 char *begin_avail, *end_avail;
39 unsigned int heap_use;
40 unsigned int heap_max;
43 extern char _vmlinux_start[];
44 extern char _vmlinux_end[];
45 extern char _initrd_start[];
46 extern char _initrd_end[];
47 extern unsigned long vmlinux_filesize;
48 extern unsigned long vmlinux_memsize;
53 unsigned long memsize;
55 struct addr_range vmlinux = {0, 0, 0};
56 struct addr_range vmlinuz = {0, 0, 0};
57 struct addr_range initrd = {0, 0, 0};
59 static char scratch[128<<10]; /* 128kB of scratch space for gunzip */
61 typedef void (*kernel_entry_t)( unsigned long,
76 static unsigned long claim_base = PROG_START;
78 static unsigned long try_claim(unsigned long size)
80 unsigned long addr = 0;
82 for(; claim_base < RAM_END; claim_base += 0x100000) {
84 printf(" trying: 0x%08lx\n\r", claim_base);
86 addr = (unsigned long)claim(claim_base, size, 0);
87 if ((void *)addr != (void *)-1)
92 claim_base = PAGE_ALIGN(claim_base + size);
96 void start(unsigned long a1, unsigned long a2, void *promptr)
99 kernel_entry_t kernel_entry;
103 prom = (int (*)(void *)) promptr;
104 chosen_handle = finddevice("/chosen");
105 if (chosen_handle == (void *) -1)
107 if (getprop(chosen_handle, "stdout", &stdout, sizeof(stdout)) != 4)
110 if (getprop(chosen_handle, "stdin", &stdin, sizeof(stdin)) != 4)
113 printf("\n\rzImage starting: loaded at 0x%x\n\r", (unsigned)_start);
116 * Now we try to claim some memory for the kernel itself
117 * our "vmlinux_memsize" is the memory footprint in RAM, _HOWEVER_, what
118 * our Makefile stuffs in is an image containing all sort of junk including
119 * an ELF header. We need to do some calculations here to find the right
120 * size... In practice we add 1Mb, that is enough, but we should really
121 * consider fixing the Makefile to put a _raw_ kernel in there !
123 vmlinux_memsize += 0x100000;
124 printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux_memsize);
125 vmlinux.addr = try_claim(vmlinux_memsize);
126 if (vmlinux.addr == 0) {
127 printf("Can't allocate memory for kernel image !\n\r");
130 vmlinuz.addr = (unsigned long)_vmlinux_start;
131 vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
132 vmlinux.size = PAGE_ALIGN(vmlinux_filesize);
133 vmlinux.memsize = vmlinux_memsize;
136 * Now we try to claim memory for the initrd (and copy it there)
138 initrd.size = (unsigned long)(_initrd_end - _initrd_start);
139 initrd.memsize = initrd.size;
140 if ( initrd.size > 0 ) {
141 printf("Allocating 0x%lx bytes for initrd ...\n\r", initrd.size);
142 initrd.addr = try_claim(initrd.size);
143 if (initrd.addr == 0) {
144 printf("Can't allocate memory for initial ramdisk !\n\r");
149 printf("initial ramdisk moving 0x%lx <- 0x%lx (0x%lx bytes)\n\r",
150 initrd.addr, (unsigned long)_initrd_start, initrd.size);
151 memmove((void *)initrd.addr, (void *)_initrd_start, initrd.size);
152 printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd.addr));
155 /* Eventually gunzip the kernel */
156 if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
159 begin_avail = avail_high = avail_ram;
160 end_avail = scratch + sizeof(scratch);
161 printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
162 vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
164 gunzip((void *)vmlinux.addr, vmlinux.size,
165 (unsigned char *)vmlinuz.addr, &len);
166 printf("done 0x%lx bytes\n\r", len);
167 printf("0x%x bytes of heap consumed, max in use 0x%x\n\r",
168 (unsigned)(avail_high - begin_avail), heap_max);
170 memmove((void *)vmlinux.addr,(void *)vmlinuz.addr,vmlinuz.size);
173 /* Skip over the ELF header */
174 elf64 = (Elf64_Ehdr *)vmlinux.addr;
175 if ( elf64->e_ident[EI_MAG0] != ELFMAG0 ||
176 elf64->e_ident[EI_MAG1] != ELFMAG1 ||
177 elf64->e_ident[EI_MAG2] != ELFMAG2 ||
178 elf64->e_ident[EI_MAG3] != ELFMAG3 ||
179 elf64->e_ident[EI_CLASS] != ELFCLASS64 ||
180 elf64->e_ident[EI_DATA] != ELFDATA2MSB ||
181 elf64->e_type != ET_EXEC ||
182 elf64->e_machine != EM_PPC64 )
184 printf("Error: not a valid PPC64 ELF file!\n\r");
188 elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
189 (unsigned long)elf64->e_phoff);
190 for(i=0; i < (unsigned int)elf64->e_phnum ;i++,elf64ph++) {
191 if (elf64ph->p_type == PT_LOAD && elf64ph->p_offset != 0)
195 printf("... skipping 0x%lx bytes of ELF header\n\r",
196 (unsigned long)elf64ph->p_offset);
198 vmlinux.addr += (unsigned long)elf64ph->p_offset;
199 vmlinux.size -= (unsigned long)elf64ph->p_offset;
201 flush_cache((void *)vmlinux.addr, vmlinux.size);
203 kernel_entry = (kernel_entry_t)vmlinux.addr;
205 printf( "kernel:\n\r"
206 " entry addr = 0x%lx\n\r"
210 " bi_recs = 0x%lx,\n\r",
211 (unsigned long)kernel_entry, a1, a2,
212 (unsigned long)prom, NULL);
215 kernel_entry( a1, a2, prom, NULL );
217 printf("Error: Linux kernel returned to zImage bootloader!\n\r");
225 struct memchunk *next;
228 static struct memchunk *freechunks;
230 void *zalloc(void *x, unsigned items, unsigned size)
233 struct memchunk **mpp, *mp;
236 size = _ALIGN(size, sizeof(struct memchunk));
238 if (heap_use > heap_max)
240 for (mpp = &freechunks; (mp = *mpp) != 0; mpp = &mp->next) {
241 if (mp->size == size) {
248 if (avail_ram > avail_high)
249 avail_high = avail_ram;
250 if (avail_ram > end_avail) {
251 printf("oops... out of memory\n\r");
257 void zfree(void *x, void *addr, unsigned nb)
259 struct memchunk *mp = addr;
261 nb = _ALIGN(nb, sizeof(struct memchunk));
263 if (avail_ram == addr + nb) {
268 mp->next = freechunks;
273 #define EXTRA_FIELD 4
276 #define RESERVED 0xe0
280 void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
288 if (src[2] != DEFLATED || (flags & RESERVED) != 0) {
289 printf("bad gzipped data\n\r");
292 if ((flags & EXTRA_FIELD) != 0)
293 i = 12 + src[10] + (src[11] << 8);
294 if ((flags & ORIG_NAME) != 0)
295 while (src[i++] != 0)
297 if ((flags & COMMENT) != 0)
298 while (src[i++] != 0)
300 if ((flags & HEAD_CRC) != 0)
303 printf("gunzip: ran out of data in header\n\r");
309 r = inflateInit2(&s, -MAX_WBITS);
311 printf("inflateInit2 returned %d\n\r", r);
315 s.avail_in = *lenp - i;
317 s.avail_out = dstlen;
318 r = inflate(&s, Z_FINISH);
319 if (r != Z_OK && r != Z_STREAM_END) {
320 printf("inflate returned %d msg: %s\n\r", r, s.msg);
323 *lenp = s.next_out - (unsigned char *) dst;