linux/arch/parisc/boot/compressed/misc.c
<<
>>
Prefs
   1/*
   2 * Definitions and wrapper functions for kernel decompressor
   3 *
   4 *   (C) 2017 Helge Deller <deller@gmx.de>
   5 */
   6
   7#include <linux/uaccess.h>
   8#include <linux/elf.h>
   9#include <asm/unaligned.h>
  10#include <asm/page.h>
  11#include "sizes.h"
  12
  13/*
  14 * gzip declarations
  15 */
  16#define STATIC static
  17
  18#undef memmove
  19#define memmove memmove
  20#define memzero(s, n) memset((s), 0, (n))
  21
  22#define malloc  malloc_gzip
  23#define free    free_gzip
  24
  25/* Symbols defined by linker scripts */
  26extern char input_data[];
  27extern int input_len;
  28/* output_len is inserted by the linker possibly at an unaligned address */
  29extern __le32 output_len __aligned(1);
  30extern char _text, _end;
  31extern char _bss, _ebss;
  32extern char _startcode_end;
  33extern void startup_continue(void *entry, unsigned long cmdline,
  34        unsigned long rd_start, unsigned long rd_end) __noreturn;
  35
  36void error(char *m) __noreturn;
  37
  38static unsigned long free_mem_ptr;
  39static unsigned long free_mem_end_ptr;
  40
  41#ifdef CONFIG_KERNEL_GZIP
  42#include "../../../../lib/decompress_inflate.c"
  43#endif
  44
  45#ifdef CONFIG_KERNEL_BZIP2
  46#include "../../../../lib/decompress_bunzip2.c"
  47#endif
  48
  49#ifdef CONFIG_KERNEL_LZ4
  50#include "../../../../lib/decompress_unlz4.c"
  51#endif
  52
  53#ifdef CONFIG_KERNEL_LZMA
  54#include "../../../../lib/decompress_unlzma.c"
  55#endif
  56
  57#ifdef CONFIG_KERNEL_LZO
  58#include "../../../../lib/decompress_unlzo.c"
  59#endif
  60
  61#ifdef CONFIG_KERNEL_XZ
  62#include "../../../../lib/decompress_unxz.c"
  63#endif
  64
  65void *memmove(void *dest, const void *src, size_t n)
  66{
  67        const char *s = src;
  68        char *d = dest;
  69
  70        if (d <= s) {
  71                while (n--)
  72                        *d++ = *s++;
  73        } else {
  74                d += n;
  75                s += n;
  76                while (n--)
  77                        *--d = *--s;
  78        }
  79        return dest;
  80}
  81
  82void *memset(void *s, int c, size_t count)
  83{
  84        char *xs = (char *)s;
  85
  86        while (count--)
  87                *xs++ = c;
  88        return s;
  89}
  90
  91void *memcpy(void *d, const void *s, size_t len)
  92{
  93        char *dest = (char *)d;
  94        const char *source = (const char *)s;
  95
  96        while (len--)
  97                *dest++ = *source++;
  98        return d;
  99}
 100
 101size_t strlen(const char *s)
 102{
 103        const char *sc;
 104
 105        for (sc = s; *sc != '\0'; ++sc)
 106                ;
 107        return sc - s;
 108}
 109
 110char *strchr(const char *s, int c)
 111{
 112        while (*s) {
 113                if (*s == (char)c)
 114                        return (char *)s;
 115                ++s;
 116        }
 117        return NULL;
 118}
 119
 120int puts(const char *s)
 121{
 122        const char *nuline = s;
 123
 124        while ((nuline = strchr(s, '\n')) != NULL) {
 125                if (nuline != s)
 126                        pdc_iodc_print(s, nuline - s);
 127                pdc_iodc_print("\r\n", 2);
 128                s = nuline + 1;
 129        }
 130        if (*s != '\0')
 131                pdc_iodc_print(s, strlen(s));
 132
 133        return 0;
 134}
 135
 136static int putchar(int c)
 137{
 138        char buf[2];
 139
 140        buf[0] = c;
 141        buf[1] = '\0';
 142        puts(buf);
 143        return c;
 144}
 145
 146void __noreturn error(char *x)
 147{
 148        puts("\n\n");
 149        puts(x);
 150        puts("\n\n -- System halted");
 151        while (1)       /* wait forever */
 152                ;
 153}
 154
 155static int print_hex(unsigned long num)
 156{
 157        const char hex[] = "0123456789abcdef";
 158        char str[40];
 159        int i = sizeof(str)-1;
 160
 161        str[i--] = '\0';
 162        do {
 163                str[i--] = hex[num & 0x0f];
 164                num >>= 4;
 165        } while (num);
 166
 167        str[i--] = 'x';
 168        str[i] = '0';
 169        puts(&str[i]);
 170
 171        return 0;
 172}
 173
 174int printf(const char *fmt, ...)
 175{
 176        va_list args;
 177        int i = 0;
 178
 179        va_start(args, fmt);
 180
 181        while (fmt[i]) {
 182                if (fmt[i] != '%') {
 183put:
 184                        putchar(fmt[i++]);
 185                        continue;
 186                }
 187
 188                if (fmt[++i] == '%')
 189                        goto put;
 190                ++i;
 191                print_hex(va_arg(args, unsigned long));
 192        }
 193
 194        va_end(args);
 195        return 0;
 196}
 197
 198/* helper functions for libgcc */
 199void abort(void)
 200{
 201        error("aborted.");
 202}
 203
 204#undef malloc
 205void *malloc(size_t size)
 206{
 207        return malloc_gzip(size);
 208}
 209
 210#undef free
 211void free(void *ptr)
 212{
 213        return free_gzip(ptr);
 214}
 215
 216
 217static void flush_data_cache(char *start, unsigned long length)
 218{
 219        char *end = start + length;
 220
 221        do {
 222                asm volatile("fdc 0(%0)" : : "r" (start));
 223                asm volatile("fic 0(%%sr0,%0)" : : "r" (start));
 224                start += 16;
 225        } while (start < end);
 226        asm volatile("fdc 0(%0)" : : "r" (end));
 227
 228        asm ("sync");
 229}
 230
 231static void parse_elf(void *output)
 232{
 233#ifdef CONFIG_64BIT
 234        Elf64_Ehdr ehdr;
 235        Elf64_Phdr *phdrs, *phdr;
 236#else
 237        Elf32_Ehdr ehdr;
 238        Elf32_Phdr *phdrs, *phdr;
 239#endif
 240        void *dest;
 241        int i;
 242
 243        memcpy(&ehdr, output, sizeof(ehdr));
 244        if (ehdr.e_ident[EI_MAG0] != ELFMAG0 ||
 245           ehdr.e_ident[EI_MAG1] != ELFMAG1 ||
 246           ehdr.e_ident[EI_MAG2] != ELFMAG2 ||
 247           ehdr.e_ident[EI_MAG3] != ELFMAG3) {
 248                error("Kernel is not a valid ELF file");
 249                return;
 250        }
 251
 252#ifdef DEBUG
 253        printf("Parsing ELF... ");
 254#endif
 255
 256        phdrs = malloc(sizeof(*phdrs) * ehdr.e_phnum);
 257        if (!phdrs)
 258                error("Failed to allocate space for phdrs");
 259
 260        memcpy(phdrs, output + ehdr.e_phoff, sizeof(*phdrs) * ehdr.e_phnum);
 261
 262        for (i = 0; i < ehdr.e_phnum; i++) {
 263                phdr = &phdrs[i];
 264
 265                switch (phdr->p_type) {
 266                case PT_LOAD:
 267                        dest = (void *)((unsigned long) phdr->p_paddr &
 268                                        (__PAGE_OFFSET_DEFAULT-1));
 269                        memmove(dest, output + phdr->p_offset, phdr->p_filesz);
 270                        break;
 271                default:
 272                        break;
 273                }
 274        }
 275
 276        free(phdrs);
 277}
 278
 279unsigned long decompress_kernel(unsigned int started_wide,
 280                unsigned int command_line,
 281                const unsigned int rd_start,
 282                const unsigned int rd_end)
 283{
 284        char *output;
 285        unsigned long vmlinux_addr, vmlinux_len;
 286        unsigned long kernel_addr, kernel_len;
 287
 288#ifdef CONFIG_64BIT
 289        parisc_narrow_firmware = 0;
 290#endif
 291
 292        set_firmware_width_unlocked();
 293
 294        putchar('D');   /* if you get this D and no more, string storage */
 295                        /* in $GLOBAL$ is wrong or %dp is wrong */
 296        puts("ecompressing Linux... ");
 297
 298        /* where the final bits are stored */
 299        kernel_addr = KERNEL_BINARY_TEXT_START;
 300        kernel_len = __pa(SZ_end) - __pa(SZparisc_kernel_start);
 301        if ((unsigned long) &_startcode_end > kernel_addr)
 302                error("Bootcode overlaps kernel code");
 303
 304        /*
 305         * Calculate addr to where the vmlinux ELF file shall be decompressed.
 306         * Assembly code in head.S positioned the stack directly behind bss, so
 307         * leave 2 MB for the stack.
 308         */
 309        vmlinux_addr = (unsigned long) &_ebss + 2*1024*1024;
 310        vmlinux_len = get_unaligned_le32(&output_len);
 311        output = (char *) vmlinux_addr;
 312
 313        /*
 314         * Initialize free_mem_ptr and free_mem_end_ptr.
 315         */
 316        free_mem_ptr = vmlinux_addr + vmlinux_len;
 317
 318        /* Limit memory for bootoader to 1GB */
 319        #define ARTIFICIAL_LIMIT (1*1024*1024*1024)
 320        free_mem_end_ptr = PAGE0->imm_max_mem;
 321        if (free_mem_end_ptr > ARTIFICIAL_LIMIT)
 322                free_mem_end_ptr = ARTIFICIAL_LIMIT;
 323
 324#ifdef CONFIG_BLK_DEV_INITRD
 325        /* if we have ramdisk this is at end of memory */
 326        if (rd_start && rd_start < free_mem_end_ptr)
 327                free_mem_end_ptr = rd_start;
 328#endif
 329
 330        if (free_mem_ptr >= free_mem_end_ptr)
 331                error("Kernel too big for machine.");
 332
 333#ifdef DEBUG
 334        printf("\n");
 335        printf("startcode_end = %x\n", &_startcode_end);
 336        printf("commandline   = %x\n", command_line);
 337        printf("rd_start      = %x\n", rd_start);
 338        printf("rd_end        = %x\n", rd_end);
 339
 340        printf("free_ptr      = %x\n", free_mem_ptr);
 341        printf("free_ptr_end  = %x\n", free_mem_end_ptr);
 342
 343        printf("input_data    = %x\n", input_data);
 344        printf("input_len     = %x\n", input_len);
 345        printf("output        = %x\n", output);
 346        printf("output_len    = %x\n", vmlinux_len);
 347        printf("kernel_addr   = %x\n", kernel_addr);
 348        printf("kernel_len    = %x\n", kernel_len);
 349#endif
 350
 351        __decompress(input_data, input_len, NULL, NULL,
 352                        output, 0, NULL, error);
 353        parse_elf(output);
 354
 355        output = (char *) kernel_addr;
 356        flush_data_cache(output, kernel_len);
 357
 358        printf("done.\nBooting the kernel.\n");
 359
 360        return (unsigned long) output;
 361}
 362