cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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misc.c (4544B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * misc.c
      4 * 
      5 * This is a collection of several routines from gzip-1.0.3 
      6 * adapted for Linux.
      7 *
      8 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
      9 *
     10 * Modified for ARM Linux by Russell King
     11 *
     12 * Nicolas Pitre <nico@visuaide.com>  1999/04/14 :
     13 *  For this code to run directly from Flash, all constant variables must
     14 *  be marked with 'const' and all other variables initialized at run-time 
     15 *  only.  This way all non constant variables will end up in the bss segment,
     16 *  which should point to addresses in RAM and cleared to 0 on start.
     17 *  This allows for a much quicker boot time.
     18 *
     19 * Modified for Alpha, from the ARM version, by Jay Estabrook 2003.
     20 */
     21
     22#include <linux/kernel.h>
     23#include <linux/slab.h>
     24
     25#include <linux/uaccess.h>
     26
     27#define memzero(s,n)	memset ((s),0,(n))
     28#define puts		srm_printk
     29extern long srm_printk(const char *, ...)
     30     __attribute__ ((format (printf, 1, 2)));
     31
     32/*
     33 * gzip declarations
     34 */
     35#define OF(args)  args
     36#define STATIC static
     37
     38typedef unsigned char  uch;
     39typedef unsigned short ush;
     40typedef unsigned long  ulg;
     41
     42#define WSIZE 0x8000		/* Window size must be at least 32k, */
     43				/* and a power of two */
     44
     45static uch *inbuf;		/* input buffer */
     46static uch *window;		/* Sliding window buffer */
     47
     48static unsigned insize;		/* valid bytes in inbuf */
     49static unsigned inptr;		/* index of next byte to be processed in inbuf */
     50static unsigned outcnt;		/* bytes in output buffer */
     51
     52/* gzip flag byte */
     53#define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
     54#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
     55#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
     56#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
     57#define COMMENT      0x10 /* bit 4 set: file comment present */
     58#define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
     59#define RESERVED     0xC0 /* bit 6,7:   reserved */
     60
     61#define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
     62
     63/* Diagnostic functions */
     64#ifdef DEBUG
     65#  define Assert(cond,msg) {if(!(cond)) error(msg);}
     66#  define Trace(x) fprintf x
     67#  define Tracev(x) {if (verbose) fprintf x ;}
     68#  define Tracevv(x) {if (verbose>1) fprintf x ;}
     69#  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
     70#  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
     71#else
     72#  define Assert(cond,msg)
     73#  define Trace(x)
     74#  define Tracev(x)
     75#  define Tracevv(x)
     76#  define Tracec(c,x)
     77#  define Tracecv(c,x)
     78#endif
     79
     80static int  fill_inbuf(void);
     81static void flush_window(void);
     82static void error(char *m);
     83
     84static char *input_data;
     85static int  input_data_size;
     86
     87static uch *output_data;
     88static ulg output_ptr;
     89static ulg bytes_out;
     90
     91static void error(char *m);
     92static void gzip_mark(void **);
     93static void gzip_release(void **);
     94
     95extern int end;
     96static ulg free_mem_ptr;
     97static ulg free_mem_end_ptr;
     98
     99#define HEAP_SIZE 0x3000
    100
    101#include "../../../lib/inflate.c"
    102
    103/* ===========================================================================
    104 * Fill the input buffer. This is called only when the buffer is empty
    105 * and at least one byte is really needed.
    106 */
    107int fill_inbuf(void)
    108{
    109	if (insize != 0)
    110		error("ran out of input data");
    111
    112	inbuf = input_data;
    113	insize = input_data_size;
    114
    115	inptr = 1;
    116	return inbuf[0];
    117}
    118
    119/* ===========================================================================
    120 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
    121 * (Used for the decompressed data only.)
    122 */
    123void flush_window(void)
    124{
    125	ulg c = crc;
    126	unsigned n;
    127	uch *in, *out, ch;
    128
    129	in = window;
    130	out = &output_data[output_ptr];
    131	for (n = 0; n < outcnt; n++) {
    132		ch = *out++ = *in++;
    133		c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
    134	}
    135	crc = c;
    136	bytes_out += (ulg)outcnt;
    137	output_ptr += (ulg)outcnt;
    138	outcnt = 0;
    139/*	puts("."); */
    140}
    141
    142static void error(char *x)
    143{
    144	puts("\n\n");
    145	puts(x);
    146	puts("\n\n -- System halted");
    147
    148	while(1);	/* Halt */
    149}
    150
    151unsigned int
    152decompress_kernel(void *output_start,
    153		  void *input_start,
    154		  size_t ksize,
    155		  size_t kzsize)
    156{
    157	output_data		= (uch *)output_start;
    158	input_data		= (uch *)input_start;
    159	input_data_size		= kzsize; /* use compressed size */
    160
    161	/* FIXME FIXME FIXME */
    162	free_mem_ptr		= (ulg)output_start + ksize;
    163	free_mem_end_ptr	= (ulg)output_start + ksize + 0x200000;
    164	/* FIXME FIXME FIXME */
    165
    166	/* put in temp area to reduce initial footprint */
    167	window = malloc(WSIZE);
    168
    169	makecrc();
    170/*	puts("Uncompressing Linux..."); */
    171	gunzip();
    172/*	puts(" done, booting the kernel.\n"); */
    173	return output_ptr;
    174}