/* * misc.c * * This is a collection of several routines from gzip-1.0.3 * adapted for Linux. * * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994 * * Modified for ARM Linux by Russell King * * Nicolas Pitre 1999/04/14 : * For this code to run directly from Flash, all constant variables must * be marked with 'const' and all other variables initialized at run-time * only. This way all non constant variables will end up in the bss segment, * which should point to addresses in RAM and cleared to 0 on start. * This allows for a much quicker boot time. */ unsigned int __machine_arch_type; #include #include #include "uncompress.h" #ifdef STANDALONE_DEBUG #define puts printf #endif #define __ptr_t void * /* * Optimised C version of memzero for the ARM. */ void __memzero (__ptr_t s, size_t n) { union { void *vp; unsigned long *ulp; unsigned char *ucp; } u; int i; u.vp = s; for (i = n >> 5; i > 0; i--) { *u.ulp++ = 0; *u.ulp++ = 0; *u.ulp++ = 0; *u.ulp++ = 0; *u.ulp++ = 0; *u.ulp++ = 0; *u.ulp++ = 0; *u.ulp++ = 0; } if (n & 1 << 4) { *u.ulp++ = 0; *u.ulp++ = 0; *u.ulp++ = 0; *u.ulp++ = 0; } if (n & 1 << 3) { *u.ulp++ = 0; *u.ulp++ = 0; } if (n & 1 << 2) *u.ulp++ = 0; if (n & 1 << 1) { *u.ucp++ = 0; *u.ucp++ = 0; } if (n & 1) *u.ucp++ = 0; } static inline __ptr_t memcpy(__ptr_t __dest, __const __ptr_t __src, size_t __n) { int i = 0; unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src; for (i = __n >> 3; i > 0; i--) { *d++ = *s++; *d++ = *s++; *d++ = *s++; *d++ = *s++; *d++ = *s++; *d++ = *s++; *d++ = *s++; *d++ = *s++; } if (__n & 1 << 2) { *d++ = *s++; *d++ = *s++; *d++ = *s++; *d++ = *s++; } if (__n & 1 << 1) { *d++ = *s++; *d++ = *s++; } if (__n & 1) *d++ = *s++; return __dest; } /* * gzip delarations */ #define OF(args) args #define STATIC static typedef unsigned char uch; typedef unsigned short ush; typedef unsigned long ulg; #define WSIZE 0x8000 /* Window size must be at least 32k, */ /* and a power of two */ static uch *inbuf; /* input buffer */ static uch window[WSIZE]; /* Sliding window buffer */ static unsigned insize; /* valid bytes in inbuf */ static unsigned inptr; /* index of next byte to be processed in inbuf */ static unsigned outcnt; /* bytes in output buffer */ /* gzip flag byte */ #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */ #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */ #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */ #define ORIG_NAME 0x08 /* bit 3 set: original file name present */ #define COMMENT 0x10 /* bit 4 set: file comment present */ #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */ #define RESERVED 0xC0 /* bit 6,7: reserved */ #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf()) /* Diagnostic functions */ #ifdef DEBUG # define Assert(cond,msg) {if(!(cond)) error(msg);} # define Trace(x) fprintf x # define Tracev(x) {if (verbose) fprintf x ;} # define Tracevv(x) {if (verbose>1) fprintf x ;} # define Tracec(c,x) {if (verbose && (c)) fprintf x ;} # define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;} #else # define Assert(cond,msg) # define Trace(x) # define Tracev(x) # define Tracevv(x) # define Tracec(c,x) # define Tracecv(c,x) #endif static int fill_inbuf(void); static void flush_window(void); static void error(char *m); static void gzip_mark(void **); static void gzip_release(void **); extern char input_data[]; extern char input_data_end[]; static uch *output_data; static ulg output_ptr; static ulg bytes_out; static void *malloc(int size); static void free(void *where); static void error(char *m); static void gzip_mark(void **); static void gzip_release(void **); static void puts(const char *); extern int end; static ulg free_mem_ptr; static ulg free_mem_ptr_end; #define HEAP_SIZE 0x2000 #include "../../../../lib/inflate.c" #ifndef STANDALONE_DEBUG static void *malloc(int size) { void *p; if (size <0) error("Malloc error"); if (free_mem_ptr <= 0) error("Memory error"); free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */ p = (void *)free_mem_ptr; free_mem_ptr += size; if (free_mem_ptr >= free_mem_ptr_end) error("Out of memory"); return p; } static void free(void *where) { /* gzip_mark & gzip_release do the free */ } static void gzip_mark(void **ptr) { arch_decomp_wdog(); *ptr = (void *) free_mem_ptr; } static void gzip_release(void **ptr) { arch_decomp_wdog(); free_mem_ptr = (long) *ptr; } #else static void gzip_mark(void **ptr) { } static void gzip_release(void **ptr) { } #endif /* =========================================================================== * Fill the input buffer. This is called only when the buffer is empty * and at least one byte is really needed. */ int fill_inbuf(void) { if (insize != 0) error("ran out of input data"); inbuf = input_data; insize = &input_data_end[0] - &input_data[0]; inptr = 1; return inbuf[0]; } /* =========================================================================== * Write the output window window[0..outcnt-1] and update crc and bytes_out. * (Used for the decompressed data only.) */ void flush_window(void) { ulg c = crc; unsigned n; uch *in, *out, ch; in = window; out = &output_data[output_ptr]; for (n = 0; n < outcnt; n++) { ch = *out++ = *in++; c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8); } crc = c; bytes_out += (ulg)outcnt; output_ptr += (ulg)outcnt; outcnt = 0; puts("."); } static void error(char *x) { int ptr; puts("\n\n"); puts(x); puts("\n\n -- System halted"); while(1); /* Halt */ } #ifndef STANDALONE_DEBUG ulg decompress_kernel(ulg output_start, ulg free_mem_ptr_p, ulg free_mem_ptr_end_p, int arch_id) { output_data = (uch *)output_start; /* Points to kernel start */ free_mem_ptr = free_mem_ptr_p; free_mem_ptr_end = free_mem_ptr_end_p; __machine_arch_type = arch_id; arch_decomp_setup(); makecrc(); puts("Uncompressing Linux..."); gunzip(); puts(" done, booting the kernel.\n"); return output_ptr; } #else char output_buffer[1500*1024]; int main() { output_data = output_buffer; makecrc(); puts("Uncompressing Linux..."); gunzip(); puts("done.\n"); return 0; } #endif