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.
19 #include "flatdevtree.h"
21 extern void flush_cache(void *, unsigned long);
24 extern char __bss_start[];
26 extern char _vmlinux_start[];
27 extern char _vmlinux_end[];
28 extern char _initrd_start[];
29 extern char _initrd_end[];
34 unsigned long memsize;
36 static struct addr_range vmlinux;
37 static struct addr_range vmlinuz;
38 static struct addr_range initrd;
40 static unsigned long elfoffset;
43 /* scratch space for gunzip; 46912 is from zlib_inflate_workspacesize() */
44 static char scratch[46912];
45 static char elfheader[256];
47 typedef void (*kernel_entry_t)(unsigned long, unsigned long, void *);
57 static void gunzip(void *dst, int dstlen, unsigned char *src, int *lenp)
65 if (src[2] != Z_DEFLATED || (flags & RESERVED) != 0) {
66 printf("bad gzipped data\n\r");
69 if ((flags & EXTRA_FIELD) != 0)
70 i = 12 + src[10] + (src[11] << 8);
71 if ((flags & ORIG_NAME) != 0)
74 if ((flags & COMMENT) != 0)
77 if ((flags & HEAD_CRC) != 0)
80 printf("gunzip: ran out of data in header\n\r");
84 if (zlib_inflate_workspacesize() > sizeof(scratch)) {
85 printf("gunzip needs more mem\n");
88 memset(&s, 0, sizeof(s));
89 s.workspace = scratch;
90 r = zlib_inflateInit2(&s, -MAX_WBITS);
92 printf("inflateInit2 returned %d\n\r", r);
96 s.avail_in = *lenp - i;
99 r = zlib_inflate(&s, Z_FULL_FLUSH);
100 if (r != Z_OK && r != Z_STREAM_END) {
101 printf("inflate returned %d msg: %s\n\r", r, s.msg);
104 *lenp = s.next_out - (unsigned char *) dst;
108 static int is_elf64(void *hdr)
110 Elf64_Ehdr *elf64 = hdr;
114 if (!(elf64->e_ident[EI_MAG0] == ELFMAG0 &&
115 elf64->e_ident[EI_MAG1] == ELFMAG1 &&
116 elf64->e_ident[EI_MAG2] == ELFMAG2 &&
117 elf64->e_ident[EI_MAG3] == ELFMAG3 &&
118 elf64->e_ident[EI_CLASS] == ELFCLASS64 &&
119 elf64->e_ident[EI_DATA] == ELFDATA2MSB &&
120 elf64->e_type == ET_EXEC &&
121 elf64->e_machine == EM_PPC64))
124 elf64ph = (Elf64_Phdr *)((unsigned long)elf64 +
125 (unsigned long)elf64->e_phoff);
126 for (i = 0; i < (unsigned int)elf64->e_phnum; i++, elf64ph++)
127 if (elf64ph->p_type == PT_LOAD)
129 if (i >= (unsigned int)elf64->e_phnum)
132 elfoffset = (unsigned long)elf64ph->p_offset;
133 vmlinux.size = (unsigned long)elf64ph->p_filesz + elfoffset;
134 vmlinux.memsize = (unsigned long)elf64ph->p_memsz + elfoffset;
140 static int is_elf32(void *hdr)
142 Elf32_Ehdr *elf32 = hdr;
146 if (!(elf32->e_ident[EI_MAG0] == ELFMAG0 &&
147 elf32->e_ident[EI_MAG1] == ELFMAG1 &&
148 elf32->e_ident[EI_MAG2] == ELFMAG2 &&
149 elf32->e_ident[EI_MAG3] == ELFMAG3 &&
150 elf32->e_ident[EI_CLASS] == ELFCLASS32 &&
151 elf32->e_ident[EI_DATA] == ELFDATA2MSB &&
152 elf32->e_type == ET_EXEC &&
153 elf32->e_machine == EM_PPC))
156 elf32 = (Elf32_Ehdr *)elfheader;
157 elf32ph = (Elf32_Phdr *) ((unsigned long)elf32 + elf32->e_phoff);
158 for (i = 0; i < elf32->e_phnum; i++, elf32ph++)
159 if (elf32ph->p_type == PT_LOAD)
161 if (i >= elf32->e_phnum)
164 elfoffset = elf32ph->p_offset;
165 vmlinux.size = elf32ph->p_filesz + elf32ph->p_offset;
166 vmlinux.memsize = elf32ph->p_memsz + elf32ph->p_offset;
170 static void prep_kernel(unsigned long *a1, unsigned long *a2)
174 vmlinuz.addr = (unsigned long)_vmlinux_start;
175 vmlinuz.size = (unsigned long)(_vmlinux_end - _vmlinux_start);
177 /* gunzip the ELF header of the kernel */
178 if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
180 gunzip(elfheader, sizeof(elfheader),
181 (unsigned char *)vmlinuz.addr, &len);
183 memcpy(elfheader, (const void *)vmlinuz.addr,
186 if (!is_elf64(elfheader) && !is_elf32(elfheader)) {
187 printf("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
190 if (platform_ops.image_hdr)
191 platform_ops.image_hdr(elfheader);
193 /* We need to alloc the memsize plus the file offset since gzip
194 * will expand the header (file offset), then the kernel, then
195 * possible rubbish we don't care about. But the kernel bss must
196 * be claimed (it will be zero'd by the kernel itself)
198 printf("Allocating 0x%lx bytes for kernel ...\n\r", vmlinux.memsize);
199 vmlinux.addr = (unsigned long)malloc(vmlinux.memsize);
200 if (vmlinux.addr == 0) {
201 printf("Can't allocate memory for kernel image !\n\r");
206 * Now we try to alloc memory for the initrd (and copy it there)
208 initrd.size = (unsigned long)(_initrd_end - _initrd_start);
209 initrd.memsize = initrd.size;
210 if ( initrd.size > 0 ) {
211 printf("Allocating 0x%lx bytes for initrd ...\n\r",
213 initrd.addr = (unsigned long)malloc((u32)initrd.size);
214 if (initrd.addr == 0) {
215 printf("Can't allocate memory for initial "
221 printf("initial ramdisk moving 0x%lx <- 0x%lx "
222 "(0x%lx bytes)\n\r", initrd.addr,
223 (unsigned long)_initrd_start, initrd.size);
224 memmove((void *)initrd.addr, (void *)_initrd_start,
226 printf("initrd head: 0x%lx\n\r",
227 *((unsigned long *)initrd.addr));
230 /* Eventually gunzip the kernel */
231 if (*(unsigned short *)vmlinuz.addr == 0x1f8b) {
232 printf("gunzipping (0x%lx <- 0x%lx:0x%0lx)...",
233 vmlinux.addr, vmlinuz.addr, vmlinuz.addr+vmlinuz.size);
235 gunzip((void *)vmlinux.addr, vmlinux.memsize,
236 (unsigned char *)vmlinuz.addr, &len);
237 printf("done 0x%lx bytes\n\r", len);
239 memmove((void *)vmlinux.addr,(void *)vmlinuz.addr,
243 /* Skip over the ELF header */
245 printf("... skipping 0x%lx bytes of ELF header\n\r",
248 vmlinux.addr += elfoffset;
250 flush_cache((void *)vmlinux.addr, vmlinux.size);
253 void __attribute__ ((weak)) ft_init(void *dt_blob)
257 /* A buffer that may be edited by tools operating on a zImage binary so as to
258 * edit the command line passed to vmlinux (by setting /chosen/bootargs).
259 * The buffer is put in it's own section so that tools may locate it easier.
261 static char builtin_cmdline[COMMAND_LINE_SIZE]
262 __attribute__((__section__("__builtin_cmdline")));
264 static void get_cmdline(char *buf, int size)
267 int len = strlen(builtin_cmdline);
271 if (len > 0) { /* builtin_cmdline overrides dt's /chosen/bootargs */
272 len = min(len, size-1);
273 strncpy(buf, builtin_cmdline, len);
276 else if ((devp = finddevice("/chosen")))
277 getprop(devp, "bootargs", buf, size);
280 static void set_cmdline(char *buf)
284 if ((devp = finddevice("/chosen")))
285 setprop(devp, "bootargs", buf, strlen(buf) + 1);
288 /* Section where ft can be tacked on after zImage is built */
290 struct boot_param_header hdr;
292 } dt_blob __attribute__((__section__("__builtin_ft")));
294 struct platform_ops platform_ops;
295 struct dt_ops dt_ops;
296 struct console_ops console_ops;
298 void start(unsigned long a1, unsigned long a2, void *promptr, void *sp)
301 kernel_entry_t kentry;
302 char cmdline[COMMAND_LINE_SIZE];
304 memset(__bss_start, 0, _end - __bss_start);
305 memset(&platform_ops, 0, sizeof(platform_ops));
306 memset(&dt_ops, 0, sizeof(dt_ops));
307 memset(&console_ops, 0, sizeof(console_ops));
309 /* Override the dt_ops and device tree if there was an flat dev
310 * tree attached to the zImage.
312 if (dt_blob.hdr.magic == OF_DT_HEADER) {
317 if (platform_init(promptr))
319 if (console_ops.open && (console_ops.open() < 0))
321 if (platform_ops.fixups)
322 platform_ops.fixups();
324 printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r",
327 prep_kernel(&a1, &a2);
329 /* If cmdline came from zimage wrapper or if we can edit the one
330 * in the dt, print it out and edit it, if possible.
332 if ((strlen(builtin_cmdline) > 0) || console_ops.edit_cmdline) {
333 get_cmdline(cmdline, COMMAND_LINE_SIZE);
334 printf("\n\rLinux/PowerPC load: %s", cmdline);
335 if (console_ops.edit_cmdline)
336 console_ops.edit_cmdline(cmdline, COMMAND_LINE_SIZE);
338 set_cmdline(cmdline);
341 if (console_ops.close)
344 kentry = (kernel_entry_t) vmlinux.addr;
346 kentry(dt_ops.ft_addr(), 0, NULL);
348 /* XXX initrd addr/size should be passed in properties */
349 kentry(a1, a2, promptr);
351 /* console closed so printf below may not work */
352 printf("Error: Linux kernel returned to zImage boot wrapper!\n\r");