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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright (C) Paul Mackerras 1997.
3 *
4 * Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner.
5 *
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.
10 */
Olaf Heringdecd3002005-08-08 13:24:38 +100011#include <stdarg.h>
12#include <stddef.h>
13#include "elf.h"
14#include "page.h"
15#include "string.h"
16#include "stdio.h"
Mark A. Greerb2c5f612006-09-19 14:05:08 +100017#include "ops.h"
David Gibsonad9d2712007-03-05 14:24:52 +110018#include "gunzip_util.h"
David Gibsone5a2072b2007-03-22 17:02:21 +110019#include "reg.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
David Gibsonad9d2712007-03-05 14:24:52 +110021static struct gunzip_state gzstate;
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023struct addr_range {
David Gibson79c85412007-03-05 14:24:52 +110024 void *addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 unsigned long size;
Linus Torvalds1da177e2005-04-16 15:20:36 -070026};
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#undef DEBUG
29
David Gibson79c85412007-03-05 14:24:52 +110030static struct addr_range prep_kernel(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070031{
David Gibson79c85412007-03-05 14:24:52 +110032 char elfheader[256];
33 void *vmlinuz_addr = _vmlinux_start;
34 unsigned long vmlinuz_size = _vmlinux_end - _vmlinux_start;
35 void *addr = 0;
36 struct elf_info ei;
Olaf Hering8a76baf2005-10-28 17:46:40 -070037 int len;
Paul Mackerras66a45dd2006-01-14 15:04:06 +110038
Paul Mackerras94b212c2005-11-16 13:38:21 +110039 /* gunzip the ELF header of the kernel */
David Gibson79c85412007-03-05 14:24:52 +110040 gunzip_start(&gzstate, vmlinuz_addr, vmlinuz_size);
David Gibsonad9d2712007-03-05 14:24:52 +110041 gunzip_exactly(&gzstate, elfheader, sizeof(elfheader));
Paul Mackerras94b212c2005-11-16 13:38:21 +110042
Milton Miller6a923212007-03-21 09:02:44 -060043 if (!parse_elf64(elfheader, &ei) && !parse_elf32(elfheader, &ei))
44 fatal("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
45
Mark A. Greerb2c5f612006-09-19 14:05:08 +100046 if (platform_ops.image_hdr)
47 platform_ops.image_hdr(elfheader);
Paul Mackerras94b212c2005-11-16 13:38:21 +110048
David Gibsonad9d2712007-03-05 14:24:52 +110049 /* We need to alloc the memsize: gzip will expand the kernel
50 * text/data, then possible rubbish we don't care about. But
51 * the kernel bss must be claimed (it will be zero'd by the
52 * kernel itself)
Benjamin Herrenschmidtc8e3c8b2005-11-07 00:57:58 -080053 */
David Gibson79c85412007-03-05 14:24:52 +110054 printf("Allocating 0x%lx bytes for kernel ...\n\r", ei.memsize);
55
56 if (platform_ops.vmlinux_alloc) {
57 addr = platform_ops.vmlinux_alloc(ei.memsize);
58 } else {
Sebastian Siewiorc10c1782008-10-12 23:15:26 +000059 /*
60 * Check if the kernel image (without bss) would overwrite the
61 * bootwrapper. The device tree has been moved in fdt_init()
62 * to an area allocated with malloc() (somewhere past _end).
63 */
64 if ((unsigned long)_start < ei.loadsize)
Milton Miller6a923212007-03-21 09:02:44 -060065 fatal("Insufficient memory for kernel at address 0!"
Jon Smirl8ba47732008-10-30 16:51:32 +000066 " (_start=%p, uncompressed size=%08lx)\n\r",
Sebastian Siewiorc10c1782008-10-12 23:15:26 +000067 _start, ei.loadsize);
68
69 if ((unsigned long)_end < ei.memsize)
70 fatal("The final kernel image would overwrite the "
71 "device tree\n\r");
David Gibson79c85412007-03-05 14:24:52 +110072 }
73
74 /* Finally, gunzip the kernel */
75 printf("gunzipping (0x%p <- 0x%p:0x%p)...", addr,
76 vmlinuz_addr, vmlinuz_addr+vmlinuz_size);
77 /* discard up to the actual load data */
78 gunzip_discard(&gzstate, ei.elfoffset - sizeof(elfheader));
Milton Miller02cc5112007-03-29 07:31:41 -060079 len = gunzip_finish(&gzstate, addr, ei.loadsize);
80 if (len != ei.loadsize)
81 fatal("ran out of data! only got 0x%x of 0x%lx bytes.\n\r",
82 len, ei.loadsize);
David Gibsonfae59c32007-03-22 16:59:13 +110083 printf("done 0x%x bytes\n\r", len);
David Gibson79c85412007-03-05 14:24:52 +110084
85 flush_cache(addr, ei.loadsize);
86
87 return (struct addr_range){addr, ei.memsize};
88}
89
David Gibson27fbaa92007-03-22 17:02:21 +110090static struct addr_range prep_initrd(struct addr_range vmlinux, void *chosen,
David Gibson79c85412007-03-05 14:24:52 +110091 unsigned long initrd_addr,
92 unsigned long initrd_size)
93{
David Gibson79c85412007-03-05 14:24:52 +110094 /* If we have an image attached to us, it overrides anything
95 * supplied by the loader. */
96 if (_initrd_end > _initrd_start) {
97 printf("Attached initrd image at 0x%p-0x%p\n\r",
98 _initrd_start, _initrd_end);
99 initrd_addr = (unsigned long)_initrd_start;
100 initrd_size = _initrd_end - _initrd_start;
101 } else if (initrd_size > 0) {
102 printf("Using loader supplied ramdisk at 0x%lx-0x%lx\n\r",
103 initrd_addr, initrd_addr + initrd_size);
104 }
105
106 /* If there's no initrd at all, we're done */
107 if (! initrd_size)
108 return (struct addr_range){0, 0};
109
110 /*
111 * If the initrd is too low it will be clobbered when the
112 * kernel relocates to its final location. In this case,
113 * allocate a safer place and move it.
114 */
115 if (initrd_addr < vmlinux.size) {
116 void *old_addr = (void *)initrd_addr;
117
118 printf("Allocating 0x%lx bytes for initrd ...\n\r",
119 initrd_size);
120 initrd_addr = (unsigned long)malloc(initrd_size);
Milton Miller6a923212007-03-21 09:02:44 -0600121 if (! initrd_addr)
122 fatal("Can't allocate memory for initial "
David Gibson79c85412007-03-05 14:24:52 +1100123 "ramdisk !\n\r");
David Gibsonfae59c32007-03-22 16:59:13 +1100124 printf("Relocating initrd 0x%lx <- 0x%p (0x%lx bytes)\n\r",
David Gibson79c85412007-03-05 14:24:52 +1100125 initrd_addr, old_addr, initrd_size);
126 memmove((void *)initrd_addr, old_addr, initrd_size);
127 }
128
129 printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd_addr));
130
131 /* Tell the kernel initrd address via device tree */
David Gibson27fbaa92007-03-22 17:02:21 +1100132 setprop_val(chosen, "linux,initrd-start", (u32)(initrd_addr));
133 setprop_val(chosen, "linux,initrd-end", (u32)(initrd_addr+initrd_size));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
David Gibson79c85412007-03-05 14:24:52 +1100135 return (struct addr_range){(void *)initrd_addr, initrd_size};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136}
137
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000138/* A buffer that may be edited by tools operating on a zImage binary so as to
139 * edit the command line passed to vmlinux (by setting /chosen/bootargs).
140 * The buffer is put in it's own section so that tools may locate it easier.
141 */
David Gibson3af82a82007-03-22 17:02:21 +1100142static char cmdline[COMMAND_LINE_SIZE]
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000143 __attribute__((__section__("__builtin_cmdline")));
144
David Gibson3af82a82007-03-22 17:02:21 +1100145static void prep_cmdline(void *chosen)
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000146{
David Gibson3af82a82007-03-22 17:02:21 +1100147 if (cmdline[0] == '\0')
148 getprop(chosen, "bootargs", cmdline, COMMAND_LINE_SIZE-1);
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000149
David Gibson3af82a82007-03-22 17:02:21 +1100150 printf("\n\rLinux/PowerPC load: %s", cmdline);
151 /* If possible, edit the command line */
152 if (console_ops.edit_cmdline)
153 console_ops.edit_cmdline(cmdline, COMMAND_LINE_SIZE);
154 printf("\n\r");
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000155
David Gibson3af82a82007-03-22 17:02:21 +1100156 /* Put the command line back into the devtree for the kernel */
157 setprop_str(chosen, "bootargs", cmdline);
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000158}
159
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000160struct platform_ops platform_ops;
161struct dt_ops dt_ops;
162struct console_ops console_ops;
David Gibsoncd197ff2007-03-05 14:24:52 +1100163struct loader_info loader_info;
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000164
David Gibsone5a2072b2007-03-22 17:02:21 +1100165void start(void)
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000166{
David Gibson79c85412007-03-05 14:24:52 +1100167 struct addr_range vmlinux, initrd;
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000168 kernel_entry_t kentry;
David Gibson35af89e2006-11-21 11:37:37 +1100169 unsigned long ft_addr = 0;
David Gibson27fbaa92007-03-22 17:02:21 +1100170 void *chosen;
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000171
David Gibson3af82a82007-03-22 17:02:21 +1100172 /* Do this first, because malloc() could clobber the loader's
173 * command line. Only use the loader command line if a
174 * built-in command line wasn't set by an external tool */
175 if ((loader_info.cmdline_len > 0) && (cmdline[0] == '\0'))
176 memmove(cmdline, loader_info.cmdline,
177 min(loader_info.cmdline_len, COMMAND_LINE_SIZE-1));
178
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000179 if (console_ops.open && (console_ops.open() < 0))
180 exit();
181 if (platform_ops.fixups)
182 platform_ops.fixups();
183
184 printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r",
David Gibsone5a2072b2007-03-22 17:02:21 +1100185 _start, get_sp());
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000186
David Gibson27fbaa92007-03-22 17:02:21 +1100187 /* Ensure that the device tree has a /chosen node */
188 chosen = finddevice("/chosen");
189 if (!chosen)
190 chosen = create_node(NULL, "chosen");
191
David Gibson79c85412007-03-05 14:24:52 +1100192 vmlinux = prep_kernel();
David Gibson27fbaa92007-03-22 17:02:21 +1100193 initrd = prep_initrd(vmlinux, chosen,
194 loader_info.initrd_addr, loader_info.initrd_size);
David Gibson3af82a82007-03-22 17:02:21 +1100195 prep_cmdline(chosen);
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000196
David Gibson35af89e2006-11-21 11:37:37 +1100197 printf("Finalizing device tree...");
198 if (dt_ops.finalize)
199 ft_addr = dt_ops.finalize();
200 if (ft_addr)
201 printf(" flat tree at 0x%lx\n\r", ft_addr);
202 else
David Gibsoncd197ff2007-03-05 14:24:52 +1100203 printf(" using OF tree (promptr=%p)\n\r", loader_info.promptr);
David Gibson35af89e2006-11-21 11:37:37 +1100204
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000205 if (console_ops.close)
206 console_ops.close();
207
208 kentry = (kernel_entry_t) vmlinux.addr;
David Gibson35af89e2006-11-21 11:37:37 +1100209 if (ft_addr)
210 kentry(ft_addr, 0, NULL);
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000211 else
David Gibsoncd197ff2007-03-05 14:24:52 +1100212 kentry((unsigned long)initrd.addr, initrd.size,
213 loader_info.promptr);
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000214
Milton Miller6a923212007-03-21 09:02:44 -0600215 /* console closed so printf in fatal below may not work */
216 fatal("Error: Linux kernel returned to zImage boot wrapper!\n\r");
Mark A. Greerb2c5f612006-09-19 14:05:08 +1000217}