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.
23 extern void flush_cache(void *, unsigned long);
26 /* Value picked to match that used by yaboot */
27 #define PROG_START 0x01400000 /* only used on 64-bit systems */
28 #define RAM_END (512<<20) /* Fixme: use OF */
29 #define ONE_MB 0x100000
32 extern char __bss_start[];
34 extern char _vmlinux_start[];
35 extern char _vmlinux_end[];
36 extern char _initrd_start[];
37 extern char _initrd_end[];
42 unsigned long memsize;
44 static struct addr_range vmlinux;
45 static struct addr_range vmlinuz;
46 static struct addr_range initrd;
48 static unsigned long elfoffset;
50 static char scratch[46912]; /* scratch space for gunzip, from zlib_inflate_workspacesize() */
51 static char elfheader[256];
54 typedef void (*kernel_entry_t)( unsigned long,
62 static unsigned long claim_base;
70 static void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
78 if (src[2] != Z_DEFLATED || (flags & RESERVED) != 0) {
79 printf("bad gzipped data\n\r");
82 if ((flags & EXTRA_FIELD) != 0)
83 i = 12 + src[10] + (src[11] << 8);
84 if ((flags & ORIG_NAME) != 0)
87 if ((flags & COMMENT) != 0)
90 if ((flags & HEAD_CRC) != 0)
93 printf("gunzip: ran out of data in header\n\r");
97 if (zlib_inflate_workspacesize() > sizeof(scratch)) {
98 printf("gunzip needs more mem\n");
101 memset(&s, 0, sizeof(s));
102 s.workspace = scratch;
103 r = zlib_inflateInit2(&s, -MAX_WBITS);
105 printf("inflateInit2 returned %d\n\r", r);
109 s.avail_in = *lenp - i;
111 s.avail_out = dstlen;
112 r = zlib_inflate(&s, Z_FULL_FLUSH);
113 if (r != Z_OK && r != Z_STREAM_END) {
114 printf("inflate returned %d msg: %s\n\r", r, s.msg);
117 *lenp = s.next_out - (unsigned char *) dst;
121 static unsigned long try_claim(unsigned long size)
123 unsigned long addr = 0;
125 for(; claim_base < RAM_END; claim_base += ONE_MB) {
127 printf(" trying: 0x%08lx\n\r", claim_base);
129 addr = (unsigned long)claim(claim_base, size, 0);
130 if ((void *)addr != (void *)-1)
135 claim_base = PAGE_ALIGN(claim_base + size);
139 static int is_elf64(void *hdr)
141 Elf64_Ehdr *elf64 = hdr;
145 if (!(elf64->e_ident[EI_MAG0] == ELFMAG0 &&
146 elf64->e_ident[EI_MAG1] == ELFMAG1 &&
147 elf64->e_ident[EI_MAG2] == ELFMAG2 &&
148 elf64->e_ident[EI_MAG3] == ELFMAG3 &&
149 elf64->e_ident[EI_CLASS] == ELFCLASS64 &&
150 elf64->e_ident[EI_DATA] == ELFDATA2MSB &&
151 elf64->e_type == ET_EXEC &&
152 elf64->e_machine == EM_PPC64))
155 elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
156 (unsigned long)elf64->e_phoff);
157 for (i = 0; i < (unsigned int)elf64->e_phnum; i++, elf64ph++)
158 if (elf64ph->p_type == PT_LOAD)
160 if (i >= (unsigned int)elf64->e_phnum)
163 elfoffset = (unsigned long)elf64ph->p_offset;
164 vmlinux.size = (unsigned long)elf64ph->p_filesz + elfoffset;
165 vmlinux.memsize = (unsigned long)elf64ph->p_memsz + elfoffset;
167 #if defined(PROG_START)
169 * Maintain a "magic" minimum address. This keeps some older
170 * firmware platforms running.
173 if (claim_base < PROG_START)
174 claim_base = PROG_START;
180 static int is_elf32(void *hdr)
182 Elf32_Ehdr *elf32 = hdr;
186 if (!(elf32->e_ident[EI_MAG0] == ELFMAG0 &&
187 elf32->e_ident[EI_MAG1] == ELFMAG1 &&
188 elf32->e_ident[EI_MAG2] == ELFMAG2 &&
189 elf32->e_ident[EI_MAG3] == ELFMAG3 &&
190 elf32->e_ident[EI_CLASS] == ELFCLASS32 &&
191 elf32->e_ident[EI_DATA] == ELFDATA2MSB &&
192 elf32->e_type == ET_EXEC &&
193 elf32->e_machine == EM_PPC))
196 elf32 = (Elf32_Ehdr *)elfheader;
197 elf32ph = (Elf32_Phdr *) ((unsigned long)elf32 + elf32->e_phoff);
198 for (i = 0; i < elf32->e_phnum; i++, elf32ph++)
199 if (elf32ph->p_type == PT_LOAD)
201 if (i >= elf32->e_phnum)
204 elfoffset = elf32ph->p_offset;
205 vmlinux.size = elf32ph->p_filesz + elf32ph->p_offset;
206 vmlinux.memsize = elf32ph->p_memsz + elf32ph->p_offset;
210 void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
213 kernel_entry_t kernel_entry;
215 memset(__bss_start, 0, _end - __bss_start);
217 prom = (int (*)(void *)) promptr;
218 chosen_handle = finddevice("/chosen");
219 if (chosen_handle == (void *) -1)
221 if (getprop(chosen_handle, "stdout", &stdout, sizeof(stdout)) != 4)
224 printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r", _start, sp);
227 * The first available claim_base must be above the end of the
228 * the loaded kernel wrapper file (_start to _end includes the
229 * initrd image if it is present) and rounded up to a nice
230 * 1 MB boundary for good measure.
233 claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
235 vmlinuz.addr = (unsigned long)_vmlinux_start;
236 vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
238 /* gunzip the ELF header of the kernel */
239 if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
241 gunzip(elfheader, sizeof(elfheader),
242 (unsigned char *)vmlinuz.addr, &len);
244 memcpy(elfheader, (const void *)vmlinuz.addr, sizeof(elfheader));
246 if (!is_elf64(elfheader) && !is_elf32(elfheader)) {
247 printf("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
251 /* We need to claim the memsize plus the file offset since gzip
252 * will expand the header (file offset), then the kernel, then
253 * possible rubbish we don't care about. But the kernel bss must
254 * be claimed (it will be zero'd by the kernel itself)
256 printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux.memsize);
257 vmlinux.addr = try_claim(vmlinux.memsize);
258 if (vmlinux.addr == 0) {
259 printf("Can't allocate memory for kernel image !\n\r");
264 * Now we try to claim memory for the initrd (and copy it there)
266 initrd.size = (unsigned long)(_initrd_end - _initrd_start);
267 initrd.memsize = initrd.size;
268 if ( initrd.size > 0 ) {
269 printf("Allocating 0x%lx bytes for initrd ...\n\r", initrd.size);
270 initrd.addr = try_claim(initrd.size);
271 if (initrd.addr == 0) {
272 printf("Can't allocate memory for initial ramdisk !\n\r");
277 printf("initial ramdisk moving 0x%lx <- 0x%lx (0x%lx bytes)\n\r",
278 initrd.addr, (unsigned long)_initrd_start, initrd.size);
279 memmove((void *)initrd.addr, (void *)_initrd_start, initrd.size);
280 printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd.addr));
283 /* Eventually gunzip the kernel */
284 if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
285 printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
286 vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
288 gunzip((void *)vmlinux.addr, vmlinux.memsize,
289 (unsigned char *)vmlinuz.addr, &len);
290 printf("done 0x%lx bytes\n\r", len);
292 memmove((void *)vmlinux.addr,(void *)vmlinuz.addr,vmlinuz.size);
295 /* Skip over the ELF header */
297 printf("... skipping 0x%lx bytes of ELF header\n\r",
300 vmlinux.addr += elfoffset;
302 flush_cache((void *)vmlinux.addr, vmlinux.size);
304 kernel_entry = (kernel_entry_t)vmlinux.addr;
306 printf( "kernel:\n\r"
307 " entry addr = 0x%lx\n\r"
311 " bi_recs = 0x%lx,\n\r",
312 (unsigned long)kernel_entry, a1, a2,
313 (unsigned long)prom, NULL);
316 kernel_entry(a1, a2, prom, NULL);
318 printf("Error: Linux kernel returned to zImage bootloader!\n\r");