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.
20 extern void flush_cache(void *, unsigned long);
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
29 extern char __bss_start[];
31 extern char _vmlinux_start[];
32 extern char _vmlinux_end[];
33 extern char _initrd_start[];
34 extern char _initrd_end[];
39 unsigned long memsize;
41 static struct addr_range vmlinux;
42 static struct addr_range vmlinuz;
43 static struct addr_range initrd;
45 static char scratch[46912]; /* scratch space for gunzip, from zlib_inflate_workspacesize() */
46 static char elfheader[256];
49 typedef void (*kernel_entry_t)( unsigned long,
57 static unsigned long claim_base;
65 static void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
73 if (src[2] != Z_DEFLATED || (flags & RESERVED) != 0) {
74 printf("bad gzipped data\n\r");
77 if ((flags & EXTRA_FIELD) != 0)
78 i = 12 + src[10] + (src[11] << 8);
79 if ((flags & ORIG_NAME) != 0)
82 if ((flags & COMMENT) != 0)
85 if ((flags & HEAD_CRC) != 0)
88 printf("gunzip: ran out of data in header\n\r");
92 if (zlib_inflate_workspacesize() > sizeof(scratch)) {
93 printf("gunzip needs more mem\n");
96 memset(&s, 0, sizeof(s));
97 s.workspace = scratch;
98 r = zlib_inflateInit2(&s, -MAX_WBITS);
100 printf("inflateInit2 returned %d\n\r", r);
104 s.avail_in = *lenp - i;
106 s.avail_out = dstlen;
107 r = zlib_inflate(&s, Z_FULL_FLUSH);
108 if (r != Z_OK && r != Z_STREAM_END) {
109 printf("inflate returned %d msg: %s\n\r", r, s.msg);
112 *lenp = s.next_out - (unsigned char *) dst;
116 static unsigned long try_claim(unsigned long size)
118 unsigned long addr = 0;
120 for(; claim_base < RAM_END; claim_base += ONE_MB) {
122 printf(" trying: 0x%08lx\n\r", claim_base);
124 addr = (unsigned long)claim(claim_base, size, 0);
125 if ((void *)addr != (void *)-1)
130 claim_base = PAGE_ALIGN(claim_base + size);
134 void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
138 kernel_entry_t kernel_entry;
142 memset(__bss_start, 0, _end - __bss_start);
144 prom = (int (*)(void *)) promptr;
145 chosen_handle = finddevice("/chosen");
146 if (chosen_handle == (void *) -1)
148 if (getprop(chosen_handle, "stdout", &stdout, sizeof(stdout)) != 4)
151 if (getprop(chosen_handle, "stdin", &stdin, sizeof(stdin)) != 4)
154 printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r", _start, sp);
157 * The first available claim_base must be above the end of the
158 * the loaded kernel wrapper file (_start to _end includes the
159 * initrd image if it is present) and rounded up to a nice
160 * 1 MB boundary for good measure.
163 claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);
165 #if defined(PROG_START)
167 * Maintain a "magic" minimum address. This keeps some older
168 * firmware platforms running.
171 if (claim_base < PROG_START)
172 claim_base = PROG_START;
175 vmlinuz.addr = (unsigned long)_vmlinux_start;
176 vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
178 /* gunzip the ELF header of the kernel */
179 if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
181 gunzip(elfheader, sizeof(elfheader),
182 (unsigned char *)vmlinuz.addr, &len);
184 memcpy(elfheader, (const void *)vmlinuz.addr, sizeof(elfheader));
186 elf64 = (Elf64_Ehdr *)elfheader;
187 if ( elf64->e_ident[EI_MAG0] != ELFMAG0 ||
188 elf64->e_ident[EI_MAG1] != ELFMAG1 ||
189 elf64->e_ident[EI_MAG2] != ELFMAG2 ||
190 elf64->e_ident[EI_MAG3] != ELFMAG3 ||
191 elf64->e_ident[EI_CLASS] != ELFCLASS64 ||
192 elf64->e_ident[EI_DATA] != ELFDATA2MSB ||
193 elf64->e_type != ET_EXEC ||
194 elf64->e_machine != EM_PPC64 )
196 printf("Error: not a valid PPC64 ELF file!\n\r");
200 elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
201 (unsigned long)elf64->e_phoff);
202 for(i=0; i < (unsigned int)elf64->e_phnum ;i++,elf64ph++) {
203 if (elf64ph->p_type == PT_LOAD && elf64ph->p_offset != 0)
206 vmlinux.size = (unsigned long)elf64ph->p_filesz;
207 vmlinux.memsize = (unsigned long)elf64ph->p_memsz;
208 printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux.memsize);
209 vmlinux.addr = try_claim(vmlinux.memsize);
210 if (vmlinux.addr == 0) {
211 printf("Can't allocate memory for kernel image !\n\r");
216 * Now we try to claim memory for the initrd (and copy it there)
218 initrd.size = (unsigned long)(_initrd_end - _initrd_start);
219 initrd.memsize = initrd.size;
220 if ( initrd.size > 0 ) {
221 printf("Allocating 0x%lx bytes for initrd ...\n\r", initrd.size);
222 initrd.addr = try_claim(initrd.size);
223 if (initrd.addr == 0) {
224 printf("Can't allocate memory for initial ramdisk !\n\r");
229 printf("initial ramdisk moving 0x%lx <- 0x%lx (0x%lx bytes)\n\r",
230 initrd.addr, (unsigned long)_initrd_start, initrd.size);
231 memmove((void *)initrd.addr, (void *)_initrd_start, initrd.size);
232 printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd.addr));
235 /* Eventually gunzip the kernel */
236 if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
237 printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
238 vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
240 gunzip((void *)vmlinux.addr, vmlinux.memsize,
241 (unsigned char *)vmlinuz.addr, &len);
242 printf("done 0x%lx bytes\n\r", len);
244 memmove((void *)vmlinux.addr,(void *)vmlinuz.addr,vmlinuz.size);
247 /* Skip over the ELF header */
249 printf("... skipping 0x%lx bytes of ELF header\n\r",
250 (unsigned long)elf64ph->p_offset);
252 vmlinux.addr += (unsigned long)elf64ph->p_offset;
254 flush_cache((void *)vmlinux.addr, vmlinux.size);
256 kernel_entry = (kernel_entry_t)vmlinux.addr;
258 printf( "kernel:\n\r"
259 " entry addr = 0x%lx\n\r"
263 " bi_recs = 0x%lx,\n\r",
264 (unsigned long)kernel_entry, a1, a2,
265 (unsigned long)prom, NULL);
268 kernel_entry( a1, a2, prom, NULL );
270 printf("Error: Linux kernel returned to zImage bootloader!\n\r");