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 "gunzip_util.h" 19 #include "reg.h" 20 21 static struct gunzip_state gzstate; 22 23 struct addr_range { 24 void *addr; 25 unsigned long size; 26 }; 27 28 #undef DEBUG 29 30 static struct addr_range prep_kernel(void) 31 { 32 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; 37 int len; 38 39 /* gunzip the ELF header of the kernel */ 40 gunzip_start(&gzstate, vmlinuz_addr, vmlinuz_size); 41 gunzip_exactly(&gzstate, elfheader, sizeof(elfheader)); 42 43 if (!parse_elf64(elfheader, &ei) && !parse_elf32(elfheader, &ei)) 44 fatal("Error: not a valid PPC32 or PPC64 ELF file!\n\r"); 45 46 if (platform_ops.image_hdr) 47 platform_ops.image_hdr(elfheader); 48 49 /* 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) 53 */ 54 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 { 59 if ((unsigned long)_start < ei.memsize) 60 fatal("Insufficient memory for kernel at address 0!" 61 " (_start=%p)\n\r", _start); 62 } 63 64 /* Finally, gunzip the kernel */ 65 printf("gunzipping (0x%p <- 0x%p:0x%p)...", addr, 66 vmlinuz_addr, vmlinuz_addr+vmlinuz_size); 67 /* discard up to the actual load data */ 68 gunzip_discard(&gzstate, ei.elfoffset - sizeof(elfheader)); 69 len = gunzip_finish(&gzstate, addr, ei.loadsize); 70 if (len != ei.loadsize) 71 fatal("ran out of data! only got 0x%x of 0x%lx bytes.\n\r", 72 len, ei.loadsize); 73 printf("done 0x%x bytes\n\r", len); 74 75 flush_cache(addr, ei.loadsize); 76 77 return (struct addr_range){addr, ei.memsize}; 78 } 79 80 static struct addr_range prep_initrd(struct addr_range vmlinux, void *chosen, 81 unsigned long initrd_addr, 82 unsigned long initrd_size) 83 { 84 /* If we have an image attached to us, it overrides anything 85 * supplied by the loader. */ 86 if (_initrd_end > _initrd_start) { 87 printf("Attached initrd image at 0x%p-0x%p\n\r", 88 _initrd_start, _initrd_end); 89 initrd_addr = (unsigned long)_initrd_start; 90 initrd_size = _initrd_end - _initrd_start; 91 } else if (initrd_size > 0) { 92 printf("Using loader supplied ramdisk at 0x%lx-0x%lx\n\r", 93 initrd_addr, initrd_addr + initrd_size); 94 } 95 96 /* If there's no initrd at all, we're done */ 97 if (! initrd_size) 98 return (struct addr_range){0, 0}; 99 100 /* 101 * If the initrd is too low it will be clobbered when the 102 * kernel relocates to its final location. In this case, 103 * allocate a safer place and move it. 104 */ 105 if (initrd_addr < vmlinux.size) { 106 void *old_addr = (void *)initrd_addr; 107 108 printf("Allocating 0x%lx bytes for initrd ...\n\r", 109 initrd_size); 110 initrd_addr = (unsigned long)malloc(initrd_size); 111 if (! initrd_addr) 112 fatal("Can't allocate memory for initial " 113 "ramdisk !\n\r"); 114 printf("Relocating initrd 0x%lx <- 0x%p (0x%lx bytes)\n\r", 115 initrd_addr, old_addr, initrd_size); 116 memmove((void *)initrd_addr, old_addr, initrd_size); 117 } 118 119 printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd_addr)); 120 121 /* Tell the kernel initrd address via device tree */ 122 setprop_val(chosen, "linux,initrd-start", (u32)(initrd_addr)); 123 setprop_val(chosen, "linux,initrd-end", (u32)(initrd_addr+initrd_size)); 124 125 return (struct addr_range){(void *)initrd_addr, initrd_size}; 126 } 127 128 /* A buffer that may be edited by tools operating on a zImage binary so as to 129 * edit the command line passed to vmlinux (by setting /chosen/bootargs). 130 * The buffer is put in it's own section so that tools may locate it easier. 131 */ 132 static char cmdline[COMMAND_LINE_SIZE] 133 __attribute__((__section__("__builtin_cmdline"))); 134 135 static void prep_cmdline(void *chosen) 136 { 137 if (cmdline[0] == '\0') 138 getprop(chosen, "bootargs", cmdline, COMMAND_LINE_SIZE-1); 139 140 printf("\n\rLinux/PowerPC load: %s", cmdline); 141 /* If possible, edit the command line */ 142 if (console_ops.edit_cmdline) 143 console_ops.edit_cmdline(cmdline, COMMAND_LINE_SIZE); 144 printf("\n\r"); 145 146 /* Put the command line back into the devtree for the kernel */ 147 setprop_str(chosen, "bootargs", cmdline); 148 } 149 150 struct platform_ops platform_ops; 151 struct dt_ops dt_ops; 152 struct console_ops console_ops; 153 struct loader_info loader_info; 154 155 void start(void) 156 { 157 struct addr_range vmlinux, initrd; 158 kernel_entry_t kentry; 159 unsigned long ft_addr = 0; 160 void *chosen; 161 162 /* Do this first, because malloc() could clobber the loader's 163 * command line. Only use the loader command line if a 164 * built-in command line wasn't set by an external tool */ 165 if ((loader_info.cmdline_len > 0) && (cmdline[0] == '\0')) 166 memmove(cmdline, loader_info.cmdline, 167 min(loader_info.cmdline_len, COMMAND_LINE_SIZE-1)); 168 169 if (console_ops.open && (console_ops.open() < 0)) 170 exit(); 171 if (platform_ops.fixups) 172 platform_ops.fixups(); 173 174 printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r", 175 _start, get_sp()); 176 177 /* Ensure that the device tree has a /chosen node */ 178 chosen = finddevice("/chosen"); 179 if (!chosen) 180 chosen = create_node(NULL, "chosen"); 181 182 vmlinux = prep_kernel(); 183 initrd = prep_initrd(vmlinux, chosen, 184 loader_info.initrd_addr, loader_info.initrd_size); 185 prep_cmdline(chosen); 186 187 printf("Finalizing device tree..."); 188 if (dt_ops.finalize) 189 ft_addr = dt_ops.finalize(); 190 if (ft_addr) 191 printf(" flat tree at 0x%lx\n\r", ft_addr); 192 else 193 printf(" using OF tree (promptr=%p)\n\r", loader_info.promptr); 194 195 if (console_ops.close) 196 console_ops.close(); 197 198 kentry = (kernel_entry_t) vmlinux.addr; 199 if (ft_addr) 200 kentry(ft_addr, 0, NULL); 201 else 202 kentry((unsigned long)initrd.addr, initrd.size, 203 loader_info.promptr); 204 205 /* console closed so printf in fatal below may not work */ 206 fatal("Error: Linux kernel returned to zImage boot wrapper!\n\r"); 207 } 208