arch/arm/boot/compressed/misc.c

   1 /*
   2  * misc.c
   3  *
   4  * This is a collection of several routines from gzip-1.0.3
   5  * adapted for Linux.
   6  *
   7  * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
   8  *
   9  * Modified for ARM Linux by Russell King
  10  *
  11  * Nicolas Pitre <nico@visuaide.com>  1999/04/14 :
  12  *  For this code to run directly from Flash, all constant variables must
  13  *  be marked with 'const' and all other variables initialized at run-time
  14  *  only.  This way all non constant variables will end up in the bss segment,
  15  *  which should point to addresses in RAM and cleared to 0 on start.
  16  *  This allows for a much quicker boot time.
  17  */
  18
  19 unsigned int __machine_arch_type;
  20
  21 #define _LINUX_STRING_H_
  22
  23 #include <linux/compiler.h>     /* for inline */
  24 #include <linux/types.h>        /* for size_t */
  25 #include <linux/stddef.h>       /* for NULL */
  26 #include <asm/string.h>
  27 #include <linux/linkage.h>
  28
  29 #include <asm/unaligned.h>
  30
  31 #ifdef STANDALONE_DEBUG
  32 #define putstr printf
  33 #else
  34
  35 static void putstr(const char *ptr);
  36
  37 #include <mach/uncompress.h>
  38
  39 #ifdef CONFIG_DEBUG_ICEDCC
  40
  41 #ifdef CONFIG_CPU_V6
  42
  43 static void icedcc_putc(int ch)
  44 {
  45         int status, i = 0x4000000;
  46
  47         do {
  48                 if (--i < 0)
  49                         return;
  50
  51                 asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status));
  52         } while (status & (1 << 29));
  53
  54         asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch));
  55 }
  56 #elif defined(CONFIG_CPU_XSCALE)
  57
  58 static void icedcc_putc(int ch)
  59 {
  60         int status, i = 0x4000000;
  61
  62         do {
  63                 if (--i < 0)
  64                         return;
  65
  66                 asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status));
  67         } while (status & (1 << 28));
  68
  69         asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch));
  70 }
  71
  72 #else
  73
  74 static void icedcc_putc(int ch)
  75 {
  76         int status, i = 0x4000000;
  77
  78         do {
  79                 if (--i < 0)
  80                         return;
  81
  82                 asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status));
  83         } while (status & 2);
  84
  85         asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch));
  86 }
  87
  88 #endif
  89
  90 #define putc(ch)        icedcc_putc(ch)
  91 #define flush() do { } while (0)
  92 #endif
  93
  94 static void putstr(const char *ptr)
  95 {
  96         char c;
  97
  98         while ((c = *ptr++) != '\0') {
  99                 if (c == '\n')
 100                         putc('\r');
 101                 putc(c);
 102         }
 103
 104         flush();
 105 }
 106
 107 #endif
 108
 109 #define __ptr_t void *
 110
 111 #define memzero(s,n) __memzero(s,n)
 112
 113 /*
 114  * Optimised C version of memzero for the ARM.
 115  */
 116 void __memzero (__ptr_t s, size_t n)
 117 {
 118         union { void *vp; unsigned long *ulp; unsigned char *ucp; } u;
 119         int i;
 120
 121         u.vp = s;
 122
 123         for (i = n >> 5; i > 0; i--) {
 124                 *u.ulp++ = 0;
 125                 *u.ulp++ = 0;
 126                 *u.ulp++ = 0;
 127                 *u.ulp++ = 0;
 128                 *u.ulp++ = 0;
 129                 *u.ulp++ = 0;
 130                 *u.ulp++ = 0;
 131                 *u.ulp++ = 0;
 132         }
 133
 134         if (n & 1 << 4) {
 135                 *u.ulp++ = 0;
 136                 *u.ulp++ = 0;
 137                 *u.ulp++ = 0;
 138                 *u.ulp++ = 0;
 139         }
 140
 141         if (n & 1 << 3) {
 142                 *u.ulp++ = 0;
 143                 *u.ulp++ = 0;
 144         }
 145
 146         if (n & 1 << 2)
 147                 *u.ulp++ = 0;
 148
 149         if (n & 1 << 1) {
 150                 *u.ucp++ = 0;
 151                 *u.ucp++ = 0;
 152         }
 153
 154         if (n & 1)
 155                 *u.ucp++ = 0;
 156 }
 157
 158 static inline __ptr_t memcpy(__ptr_t __dest, __const __ptr_t __src,
 159                             size_t __n)
 160 {
 161         int i = 0;
 162         unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src;
 163
 164         for (i = __n >> 3; i > 0; i--) {
 165                 *d++ = *s++;
 166                 *d++ = *s++;
 167                 *d++ = *s++;
 168                 *d++ = *s++;
 169                 *d++ = *s++;
 170                 *d++ = *s++;
 171                 *d++ = *s++;
 172                 *d++ = *s++;
 173         }
 174
 175         if (__n & 1 << 2) {
 176                 *d++ = *s++;
 177                 *d++ = *s++;
 178                 *d++ = *s++;
 179                 *d++ = *s++;
 180         }
 181
 182         if (__n & 1 << 1) {
 183                 *d++ = *s++;
 184                 *d++ = *s++;
 185         }
 186
 187         if (__n & 1)
 188                 *d++ = *s++;
 189
 190         return __dest;
 191 }
 192
 193 /*
 194  * gzip delarations
 195  */
 196 #define STATIC static
 197
 198 /* Diagnostic functions */
 199 #ifdef DEBUG
 200 #  define Assert(cond,msg) {if(!(cond)) error(msg);}
 201 #  define Trace(x) fprintf x
 202 #  define Tracev(x) {if (verbose) fprintf x ;}
 203 #  define Tracevv(x) {if (verbose>1) fprintf x ;}
 204 #  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
 205 #  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
 206 #else
 207 #  define Assert(cond,msg)
 208 #  define Trace(x)
 209 #  define Tracev(x)
 210 #  define Tracevv(x)
 211 #  define Tracec(c,x)
 212 #  define Tracecv(c,x)
 213 #endif
 214
 215 static void error(char *m);
 216
 217 extern char input_data[];
 218 extern char input_data_end[];
 219
 220 static unsigned char *output_data;
 221 static unsigned long output_ptr;
 222
 223 static void error(char *m);
 224
 225 static void putstr(const char *);
 226
 227 static unsigned long free_mem_ptr;
 228 static unsigned long free_mem_end_ptr;
 229
 230 #ifdef STANDALONE_DEBUG
 231 #define NO_INFLATE_MALLOC
 232 #endif
 233
 234 #define ARCH_HAS_DECOMP_WDOG
 235
 236 #ifdef CONFIG_KERNEL_GZIP
 237 #include "../../../../lib/decompress_inflate.c"
 238 #endif
 239
 240 #ifdef CONFIG_KERNEL_LZO
 241 #include "../../../../lib/decompress_unlzo.c"
 242 #endif
 243
 244 #ifndef arch_error
 245 #define arch_error(x)
 246 #endif
 247
 248 static void error(char *x)
 249 {
 250         arch_error(x);
 251
 252         putstr("\n\n");
 253         putstr(x);
 254         putstr("\n\n -- System halted");
 255
 256         while(1);       /* Halt */
 257 }
 258
 259 asmlinkage void __div0(void)
 260 {
 261         error("Attempting division by 0!");
 262 }
 263
 264 #ifndef STANDALONE_DEBUG
 265
 266 unsigned long
 267 decompress_kernel(unsigned long output_start, unsigned long free_mem_ptr_p,
 268                 unsigned long free_mem_ptr_end_p,
 269                 int arch_id)
 270 {
 271         unsigned char *tmp;
 272
 273         output_data             = (unsigned char *)output_start;
 274         free_mem_ptr            = free_mem_ptr_p;
 275         free_mem_end_ptr        = free_mem_ptr_end_p;
 276         __machine_arch_type     = arch_id;
 277
 278         arch_decomp_setup();
 279
 280         tmp = (unsigned char *) (((unsigned long)input_data_end) - 4);
 281         output_ptr = get_unaligned_le32(tmp);
 282
 283         putstr("Uncompressing Linux...");
 284         decompress(input_data, input_data_end - input_data,
 285                         NULL, NULL, output_data, NULL, error);
 286         putstr(" done, booting the kernel.\n");
 287         return output_ptr;
 288 }
 289 #else
 290
 291 char output_buffer[1500*1024];
 292
 293 int main()
 294 {
 295         output_data = output_buffer;
 296
 297         putstr("Uncompressing Linux...");
 298         decompress(input_data, input_data_end - input_data,
 299                         NULL, NULL, output_data, NULL, error);
 300         putstr("done.\n");
 301         return 0;
 302 }
 303 #endif