arch/nios2/boot/compressed/misc.c

Source file repositories/reference/linux-study-clean/arch/nios2/boot/compressed/misc.c

File Facts

System
Linux kernel
Corpus path
arch/nios2/boot/compressed/misc.c
Extension
.c
Size
4008 bytes
Lines
175
Domain
Architecture Layer
Bucket
arch/nios2
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2009 Thomas Chou <thomas@wytron.com.tw>
 *
 * This is a collection of several routines from gzip-1.0.3
 * adapted for Linux.
 *
 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
 *
 * Adapted for SH by Stuart Menefy, Aug 1999
 *
 * Modified to use standard LinuxSH BIOS by Greg Banks 7Jul2000
 *
 * Based on arch/sh/boot/compressed/misc.c
 */

#include <linux/string.h>

/*
 * gzip declarations
 */
#define OF(args)  args
#define STATIC static

#undef memset
#undef memcpy
#define memzero(s, n)		memset((s), 0, (n))

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())

#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);

extern char input_data[];
extern int input_len;

static long bytes_out;
static uch *output_data;
static unsigned long output_ptr;

#include "console.c"

static void error(char *m);

int puts(const char *);

extern int _end;
static unsigned long free_mem_ptr;
static unsigned long free_mem_end_ptr;

#define HEAP_SIZE			0x10000

Annotation

Implementation Notes