~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/powerpc/boot/main.c

Version: ~ [ linux-5.1-rc5 ] ~ [ linux-5.0.7 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.34 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.111 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.168 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.178 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.138 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.65 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  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  */
 11 #include <stdarg.h>
 12 #include <stddef.h>
 13 #include "elf.h"
 14 #include "page.h"
 15 #include "string.h"
 16 #include "stdio.h"
 17 #include "ops.h"
 18 #include "reg.h"
 19 
 20 struct addr_range {
 21         void *addr;
 22         unsigned long size;
 23 };
 24 
 25 #undef DEBUG
 26 
 27 static struct addr_range prep_kernel(void)
 28 {
 29         char elfheader[256];
 30         unsigned char *vmlinuz_addr = (unsigned char *)_vmlinux_start;
 31         unsigned long vmlinuz_size = _vmlinux_end - _vmlinux_start;
 32         void *addr = 0;
 33         struct elf_info ei;
 34         long len;
 35         int uncompressed_image = 0;
 36 
 37         len = partial_decompress(vmlinuz_addr, vmlinuz_size,
 38                 elfheader, sizeof(elfheader), 0);
 39         /* assume uncompressed data if -1 is returned */
 40         if (len == -1) {
 41                 uncompressed_image = 1;
 42                 memcpy(elfheader, vmlinuz_addr, sizeof(elfheader));
 43                 printf("No valid compressed data found, assume uncompressed data\n\r");
 44         }
 45 
 46         if (!parse_elf64(elfheader, &ei) && !parse_elf32(elfheader, &ei))
 47                 fatal("Error: not a valid PPC32 or PPC64 ELF file!\n\r");
 48 
 49         if (platform_ops.image_hdr)
 50                 platform_ops.image_hdr(elfheader);
 51 
 52         /* We need to alloc the memsize: gzip will expand the kernel
 53          * text/data, then possible rubbish we don't care about. But
 54          * the kernel bss must be claimed (it will be zero'd by the
 55          * kernel itself)
 56          */
 57         printf("Allocating 0x%lx bytes for kernel...\n\r", ei.memsize);
 58 
 59         if (platform_ops.vmlinux_alloc) {
 60                 addr = platform_ops.vmlinux_alloc(ei.memsize);
 61         } else {
 62                 /*
 63                  * Check if the kernel image (without bss) would overwrite the
 64                  * bootwrapper. The device tree has been moved in fdt_init()
 65                  * to an area allocated with malloc() (somewhere past _end).
 66                  */
 67                 if ((unsigned long)_start < ei.loadsize)
 68                         fatal("Insufficient memory for kernel at address 0!"
 69                                " (_start=%p, uncompressed size=%08lx)\n\r",
 70                                _start, ei.loadsize);
 71 
 72                 if ((unsigned long)_end < ei.memsize)
 73                         fatal("The final kernel image would overwrite the "
 74                                         "device tree\n\r");
 75         }
 76 
 77         if (uncompressed_image) {
 78                 memcpy(addr, vmlinuz_addr + ei.elfoffset, ei.loadsize);
 79                 printf("0x%lx bytes of uncompressed data copied\n\r",
 80                        ei.loadsize);
 81                 goto out;
 82         }
 83 
 84         /* Finally, decompress the kernel */
 85         printf("Decompressing (0x%p <- 0x%p:0x%p)...\n\r", addr,
 86                vmlinuz_addr, vmlinuz_addr+vmlinuz_size);
 87 
 88         len = partial_decompress(vmlinuz_addr, vmlinuz_size,
 89                 addr, ei.loadsize, ei.elfoffset);
 90 
 91         if (len < 0)
 92                 fatal("Decompression failed with error code %ld\n\r", len);
 93 
 94         if (len != ei.loadsize)
 95                  fatal("Decompression error: got 0x%lx bytes, expected 0x%lx.\n\r",
 96                          len, ei.loadsize);
 97 
 98         printf("Done! Decompressed 0x%lx bytes\n\r", len);
 99 out:
100         flush_cache(addr, ei.loadsize);
101 
102         return (struct addr_range){addr, ei.memsize};
103 }
104 
105 static struct addr_range prep_initrd(struct addr_range vmlinux, void *chosen,
106                                      unsigned long initrd_addr,
107                                      unsigned long initrd_size)
108 {
109         /* If we have an image attached to us, it overrides anything
110          * supplied by the loader. */
111         if (_initrd_end > _initrd_start) {
112                 printf("Attached initrd image at 0x%p-0x%p\n\r",
113                        _initrd_start, _initrd_end);
114                 initrd_addr = (unsigned long)_initrd_start;
115                 initrd_size = _initrd_end - _initrd_start;
116         } else if (initrd_size > 0) {
117                 printf("Using loader supplied ramdisk at 0x%lx-0x%lx\n\r",
118                        initrd_addr, initrd_addr + initrd_size);
119         }
120 
121         /* If there's no initrd at all, we're done */
122         if (! initrd_size)
123                 return (struct addr_range){0, 0};
124 
125         /*
126          * If the initrd is too low it will be clobbered when the
127          * kernel relocates to its final location.  In this case,
128          * allocate a safer place and move it.
129          */
130         if (initrd_addr < vmlinux.size) {
131                 void *old_addr = (void *)initrd_addr;
132 
133                 printf("Allocating 0x%lx bytes for initrd ...\n\r",
134                        initrd_size);
135                 initrd_addr = (unsigned long)malloc(initrd_size);
136                 if (! initrd_addr)
137                         fatal("Can't allocate memory for initial "
138                                "ramdisk !\n\r");
139                 printf("Relocating initrd 0x%lx <- 0x%p (0x%lx bytes)\n\r",
140                        initrd_addr, old_addr, initrd_size);
141                 memmove((void *)initrd_addr, old_addr, initrd_size);
142         }
143 
144         printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd_addr));
145 
146         /* Tell the kernel initrd address via device tree */
147         setprop_val(chosen, "linux,initrd-start", (u32)(initrd_addr));
148         setprop_val(chosen, "linux,initrd-end", (u32)(initrd_addr+initrd_size));
149 
150         return (struct addr_range){(void *)initrd_addr, initrd_size};
151 }
152 
153 /* A buffer that may be edited by tools operating on a zImage binary so as to
154  * edit the command line passed to vmlinux (by setting /chosen/bootargs).
155  * The buffer is put in it's own section so that tools may locate it easier.
156  */
157 static char cmdline[BOOT_COMMAND_LINE_SIZE]
158         __attribute__((__section__("__builtin_cmdline")));
159 
160 static void prep_cmdline(void *chosen)
161 {
162         unsigned int getline_timeout = 5000;
163         int v;
164         int n;
165 
166         /* Wait-for-input time */
167         n = getprop(chosen, "linux,cmdline-timeout", &v, sizeof(v));
168         if (n == sizeof(v))
169                 getline_timeout = v;
170 
171         if (cmdline[0] == '\0')
172                 getprop(chosen, "bootargs", cmdline, BOOT_COMMAND_LINE_SIZE-1);
173 
174         printf("\n\rLinux/PowerPC load: %s", cmdline);
175 
176         /* If possible, edit the command line */
177         if (console_ops.edit_cmdline && getline_timeout)
178                 console_ops.edit_cmdline(cmdline, BOOT_COMMAND_LINE_SIZE, getline_timeout);
179 
180         printf("\n\r");
181 
182         /* Put the command line back into the devtree for the kernel */
183         setprop_str(chosen, "bootargs", cmdline);
184 }
185 
186 struct platform_ops platform_ops;
187 struct dt_ops dt_ops;
188 struct console_ops console_ops;
189 struct loader_info loader_info;
190 
191 void start(void)
192 {
193         struct addr_range vmlinux, initrd;
194         kernel_entry_t kentry;
195         unsigned long ft_addr = 0;
196         void *chosen;
197 
198         /* Do this first, because malloc() could clobber the loader's
199          * command line.  Only use the loader command line if a
200          * built-in command line wasn't set by an external tool */
201         if ((loader_info.cmdline_len > 0) && (cmdline[0] == '\0'))
202                 memmove(cmdline, loader_info.cmdline,
203                         min(loader_info.cmdline_len, BOOT_COMMAND_LINE_SIZE-1));
204 
205         if (console_ops.open && (console_ops.open() < 0))
206                 exit();
207         if (platform_ops.fixups)
208                 platform_ops.fixups();
209 
210         printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r",
211                _start, get_sp());
212 
213         /* Ensure that the device tree has a /chosen node */
214         chosen = finddevice("/chosen");
215         if (!chosen)
216                 chosen = create_node(NULL, "chosen");
217 
218         vmlinux = prep_kernel();
219         initrd = prep_initrd(vmlinux, chosen,
220                              loader_info.initrd_addr, loader_info.initrd_size);
221         prep_cmdline(chosen);
222 
223         printf("Finalizing device tree...");
224         if (dt_ops.finalize)
225                 ft_addr = dt_ops.finalize();
226         if (ft_addr)
227                 printf(" flat tree at 0x%lx\n\r", ft_addr);
228         else
229                 printf(" using OF tree (promptr=%p)\n\r", loader_info.promptr);
230 
231         if (console_ops.close)
232                 console_ops.close();
233 
234         kentry = (kernel_entry_t) vmlinux.addr;
235         if (ft_addr) {
236                 if(platform_ops.kentry)
237                         platform_ops.kentry(ft_addr, vmlinux.addr);
238                 else
239                         kentry(ft_addr, 0, NULL);
240         }
241         else
242                 kentry((unsigned long)initrd.addr, initrd.size,
243                        loader_info.promptr);
244 
245         /* console closed so printf in fatal below may not work */
246         fatal("Error: Linux kernel returned to zImage boot wrapper!\n\r");
247 }
248 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp