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.
27 static struct addr_range prep_kernel(void)
30 unsigned char *vmlinuz_addr = (unsigned char *)_vmlinux_start;
31 unsigned long vmlinuz_size = _vmlinux_end - _vmlinux_start;
36 partial_decompress(vmlinuz_addr, vmlinuz_size,
37 elfheader, sizeof(elfheader), 0);
39 if (!parse_elf64(elfheader, &ei) && !parse_elf32(elfheader, &ei))
40 fatal("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
42 if (platform_ops.image_hdr)
43 platform_ops.image_hdr(elfheader);
45 /* We need to alloc the memsize: gzip will expand the kernel
46 * text/data, then possible rubbish we don't care about. But
47 * the kernel bss must be claimed (it will be zero'd by the
50 printf("Allocating 0x%lx bytes for kernel...\n\r", ei.memsize);
52 if (platform_ops.vmlinux_alloc) {
53 addr = platform_ops.vmlinux_alloc(ei.memsize);
56 * Check if the kernel image (without bss) would overwrite the
57 * bootwrapper. The device tree has been moved in fdt_init()
58 * to an area allocated with malloc() (somewhere past _end).
60 if ((unsigned long)_start < ei.loadsize)
61 fatal("Insufficient memory for kernel at address 0!"
62 " (_start=%p, uncompressed size=%08lx)\n\r",
65 if ((unsigned long)_end < ei.memsize)
66 fatal("The final kernel image would overwrite the "
70 /* Finally, decompress the kernel */
71 printf("Decompressing (0x%p <- 0x%p:0x%p)...\n\r", addr,
72 vmlinuz_addr, vmlinuz_addr+vmlinuz_size);
74 len = partial_decompress(vmlinuz_addr, vmlinuz_size,
75 addr, ei.loadsize, ei.elfoffset);
78 fatal("Decompression failed with error code %ld\n\r", len);
80 if (len != ei.loadsize)
81 fatal("Decompression error: got 0x%lx bytes, expected 0x%lx.\n\r",
84 printf("Done! Decompressed 0x%lx bytes\n\r", len);
86 flush_cache(addr, ei.loadsize);
88 return (struct addr_range){addr, ei.memsize};
91 static struct addr_range prep_initrd(struct addr_range vmlinux, void *chosen,
92 unsigned long initrd_addr,
93 unsigned long initrd_size)
95 /* If we have an image attached to us, it overrides anything
96 * supplied by the loader. */
97 if (_initrd_end > _initrd_start) {
98 printf("Attached initrd image at 0x%p-0x%p\n\r",
99 _initrd_start, _initrd_end);
100 initrd_addr = (unsigned long)_initrd_start;
101 initrd_size = _initrd_end - _initrd_start;
102 } else if (initrd_size > 0) {
103 printf("Using loader supplied ramdisk at 0x%lx-0x%lx\n\r",
104 initrd_addr, initrd_addr + initrd_size);
107 /* If there's no initrd at all, we're done */
109 return (struct addr_range){0, 0};
112 * If the initrd is too low it will be clobbered when the
113 * kernel relocates to its final location. In this case,
114 * allocate a safer place and move it.
116 if (initrd_addr < vmlinux.size) {
117 void *old_addr = (void *)initrd_addr;
119 printf("Allocating 0x%lx bytes for initrd ...\n\r",
121 initrd_addr = (unsigned long)malloc(initrd_size);
123 fatal("Can't allocate memory for initial "
125 printf("Relocating initrd 0x%lx <- 0x%p (0x%lx bytes)\n\r",
126 initrd_addr, old_addr, initrd_size);
127 memmove((void *)initrd_addr, old_addr, initrd_size);
130 printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd_addr));
132 /* Tell the kernel initrd address via device tree */
133 setprop_val(chosen, "linux,initrd-start", (u32)(initrd_addr));
134 setprop_val(chosen, "linux,initrd-end", (u32)(initrd_addr+initrd_size));
136 return (struct addr_range){(void *)initrd_addr, initrd_size};
139 /* A buffer that may be edited by tools operating on a zImage binary so as to
140 * edit the command line passed to vmlinux (by setting /chosen/bootargs).
141 * The buffer is put in it's own section so that tools may locate it easier.
143 static char cmdline[BOOT_COMMAND_LINE_SIZE]
144 __attribute__((__section__("__builtin_cmdline")));
146 static void prep_cmdline(void *chosen)
148 unsigned int getline_timeout = 5000;
152 /* Wait-for-input time */
153 n = getprop(chosen, "linux,cmdline-timeout", &v, sizeof(v));
157 if (cmdline[0] == '\0')
158 getprop(chosen, "bootargs", cmdline, BOOT_COMMAND_LINE_SIZE-1);
160 printf("\n\rLinux/PowerPC load: %s", cmdline);
162 /* If possible, edit the command line */
163 if (console_ops.edit_cmdline && getline_timeout)
164 console_ops.edit_cmdline(cmdline, BOOT_COMMAND_LINE_SIZE, getline_timeout);
168 /* Put the command line back into the devtree for the kernel */
169 setprop_str(chosen, "bootargs", cmdline);
172 struct platform_ops platform_ops;
173 struct dt_ops dt_ops;
174 struct console_ops console_ops;
175 struct loader_info loader_info;
179 struct addr_range vmlinux, initrd;
180 kernel_entry_t kentry;
181 unsigned long ft_addr = 0;
184 /* Do this first, because malloc() could clobber the loader's
185 * command line. Only use the loader command line if a
186 * built-in command line wasn't set by an external tool */
187 if ((loader_info.cmdline_len > 0) && (cmdline[0] == '\0'))
188 memmove(cmdline, loader_info.cmdline,
189 min(loader_info.cmdline_len, BOOT_COMMAND_LINE_SIZE-1));
191 if (console_ops.open && (console_ops.open() < 0))
193 if (platform_ops.fixups)
194 platform_ops.fixups();
196 printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r",
199 /* Ensure that the device tree has a /chosen node */
200 chosen = finddevice("/chosen");
202 chosen = create_node(NULL, "chosen");
204 vmlinux = prep_kernel();
205 initrd = prep_initrd(vmlinux, chosen,
206 loader_info.initrd_addr, loader_info.initrd_size);
207 prep_cmdline(chosen);
209 printf("Finalizing device tree...");
211 ft_addr = dt_ops.finalize();
213 printf(" flat tree at 0x%lx\n\r", ft_addr);
215 printf(" using OF tree (promptr=%p)\n\r", loader_info.promptr);
217 if (console_ops.close)
220 kentry = (kernel_entry_t) vmlinux.addr;
222 kentry(ft_addr, 0, NULL);
224 kentry((unsigned long)initrd.addr, initrd.size,
225 loader_info.promptr);
227 /* console closed so printf in fatal below may not work */
228 fatal("Error: Linux kernel returned to zImage boot wrapper!\n\r");