text: /*
   * 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
   * puts by Nick Holloway 1993, better puts by Martin Mares 1995
   * adaptation for Linux/CRIS Axis Communications AB, 1999
   *
   */
  
  /* where the piggybacked kernel image expects itself to live.
   * it is the same address we use when we network load an uncompressed
   * image into DRAM, and it is the address the kernel is linked to live
   * at by vmlinux.lds.S
   */
  
  #define KERNEL_LOAD_ADR 0x40004000
  
  #include <linux/types.h>
  
  #ifdef CONFIG_ETRAX_ARCH_V32
  #include <hwregs/reg_rdwr.h>
  #include <hwregs/reg_map.h>
  #include <hwregs/ser_defs.h>
  #include <hwregs/pinmux_defs.h>
  #ifdef CONFIG_CRIS_MACH_ARTPEC3
  #include <hwregs/clkgen_defs.h>
  #endif
  #else
  #include <arch/svinto.h>
  #endif
  
  /*
   * gzip declarations
   */
  
  #define OF(args)  args
  #define STATIC static
  
  void *memset(void *s, int c, size_t n);
  void *memcpy(void *__dest, __const void *__src, size_t __n);
  
  #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 */
  
  unsigned inptr = 0;	/* index of next byte to be processed in inbuf
  			 * After decompression it will contain the
  			 * compressed size, and head.S will read it.
  			 */
  
  static unsigned outcnt = 0;  /* 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() (inbuf[inptr++])
  
  /* Diagnostic functions */
  #ifdef DEBUG
  #  define Assert(cond, msg) do { \
  		if (!(cond)) \
  			error(msg); \
  	} while (0)
  #  define Trace(x) fprintf x
  #  define Tracev(x) do { \
  		if (verbose) \
  			fprintf x; \
  	} while (0)
  #  define Tracevv(x) do { \
  		if (verbose > 1) \
  			fprintf x; \
  	} while (0)
  #  define Tracec(c, x) do { \
  		if (verbose && (c)) \
  			fprintf x; \
  	} while (0)
  #  define Tracecv(c, x) do { \
  		if (verbose > 1 && (c)) \
  			fprintf x; \
  	} while (0)
  #else
  #  define Assert(cond, msg)
  #  define Trace(x)
  #  define Tracev(x)
  #  define Tracevv(x)
  #  define Tracec(c, x)
  #  define Tracecv(c, x)
  #endif
  
  static void flush_window(void);
  static void error(char *m);
  static void aputs(const char *s);
  
  extern char *input_data;  /* lives in head.S */
  
  static long bytes_out;
  static uch *output_data;
  static unsigned long output_ptr;
  
  /* the "heap" is put directly after the BSS ends, at end */
  
  extern int _end;
  static long free_mem_ptr = (long)&_end;
  static long free_mem_end_ptr;
  
  #include "../../../../../lib/inflate.c"
  
  /* decompressor info and error messages to serial console */
  
  #ifdef CONFIG_ETRAX_ARCH_V32
  static inline void serout(const char *s, reg_scope_instances regi_ser)
  {
  	reg_ser_rs_stat_din rs;
  	reg_ser_rw_dout dout = {.data = *s};
  
  	do {
  		rs = REG_RD(ser, regi_ser, rs_stat_din);
  	}
  	while (!rs.tr_rdy);/* Wait for transceiver. */
  
  	REG_WR(ser, regi_ser, rw_dout, dout);
  }
  #define SEROUT(S, N) \
  	do { \
  		serout(S, regi_ser ## N); \
  		s++; \
  	} while (0)
  #else
  #define SEROUT(S, N) do { \
  		while (!(*R_SERIAL ## N ## _STATUS & (1 << 5))) \
  			; \
  		*R_SERIAL ## N ## _TR_DATA = *s++; \
  	} while (0)
  #endif
  
  static void aputs(const char *s)
  {
  #ifndef CONFIG_ETRAX_DEBUG_PORT_NULL
  	while (*s) {
  #ifdef CONFIG_ETRAX_DEBUG_PORT0
  		SEROUT(s, 0);
  #endif
  #ifdef CONFIG_ETRAX_DEBUG_PORT1
  		SEROUT(s, 1);
  #endif
  #ifdef CONFIG_ETRAX_DEBUG_PORT2
  		SEROUT(s, 2);
  #endif
  #ifdef CONFIG_ETRAX_DEBUG_PORT3
  		SEROUT(s, 3);
  #endif
  	}
  #endif /* CONFIG_ETRAX_DEBUG_PORT_NULL */
  }
  
  void *memset(void *s, int c, size_t n)
  {
  	int i;
  	char *ss = (char*)s;
  
  	for (i=0;i<n;i++) ss[i] = c;
  
  	return s;
  }
  
  void *memcpy(void *__dest, __const void *__src, size_t __n)
  {
  	int i;
  	char *d = (char *)__dest, *s = (char *)__src;
  
  	for (i = 0; i < __n; i++)
  		d[i] = s[i];
  
  	return __dest;
  }
  
  /* ===========================================================================
   * Write the output window window[0..outcnt-1] and update crc and bytes_out.
   * (Used for the decompressed data only.)
   */
  
  static void flush_window(void)
  {
  	ulg c = crc;         /* temporary variable */
  	unsigned n;
  	uch *in, *out, ch;
  
  	in = window;
  	out = &output_data[output_ptr];
  	for (n = 0; n < outcnt; n++) {
  		ch = *out = *in;
  		out++;
  		in++;
  		c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
  	}
  	crc = c;
  	bytes_out += (ulg)outcnt;
  	output_ptr += (ulg)outcnt;
  	outcnt = 0;
  }
  
  static void error(char *x)
  {
  	aputs("\n\n");
  	aputs(x);
  	aputs("\n\n -- System halted\n");
  
  	while(1);	/* Halt */
  }
  
  void setup_normal_output_buffer(void)
  {
  	output_data = (char *)KERNEL_LOAD_ADR;
  }
  
  #ifdef CONFIG_ETRAX_ARCH_V32
  static inline void serial_setup(reg_scope_instances regi_ser)
  {
  	reg_ser_rw_xoff xoff;
  	reg_ser_rw_tr_ctrl tr_ctrl;
  	reg_ser_rw_rec_ctrl rec_ctrl;
  	reg_ser_rw_tr_baud_div tr_baud;
  	reg_ser_rw_rec_baud_div rec_baud;
  
  	/* Turn off XOFF. */
  	xoff = REG_RD(ser, regi_ser, rw_xoff);
  
  	xoff.chr = 0;
  	xoff.automatic = regk_ser_no;
  
  	REG_WR(ser, regi_ser, rw_xoff, xoff);
  
  	/* Set baudrate and stopbits. */
  	tr_ctrl = REG_RD(ser, regi_ser, rw_tr_ctrl);
  	rec_ctrl = REG_RD(ser, regi_ser, rw_rec_ctrl);
  	tr_baud = REG_RD(ser, regi_ser, rw_tr_baud_div);
  	rec_baud = REG_RD(ser, regi_ser, rw_rec_baud_div);
  
  	tr_ctrl.stop_bits = 1;	/* 2 stop bits. */
  	tr_ctrl.en = 1; /* enable transmitter */
  	rec_ctrl.en = 1; /* enabler receiver */
  
  	/*
  	 * The baudrate setup used to be a bit fishy, but now transmitter and
  	 * receiver are both set to the intended baud rate, 115200.
  	 * The magic value is 29.493 MHz.
  	 */
  	tr_ctrl.base_freq = regk_ser_f29_493;
  	rec_ctrl.base_freq = regk_ser_f29_493;
  	tr_baud.div = (29493000 / 8) / 115200;
  	rec_baud.div = (29493000 / 8) / 115200;
  
  	REG_WR(ser, regi_ser, rw_tr_ctrl, tr_ctrl);
  	REG_WR(ser, regi_ser, rw_tr_baud_div, tr_baud);
  	REG_WR(ser, regi_ser, rw_rec_ctrl, rec_ctrl);
  	REG_WR(ser, regi_ser, rw_rec_baud_div, rec_baud);
  }
  #endif
  
  void decompress_kernel(void)
  {
  	char revision;
  	char compile_rev;
  
  #ifdef CONFIG_ETRAX_ARCH_V32
  	/* Need at least a CRISv32 to run. */
  	compile_rev = 32;
  #if defined(CONFIG_ETRAX_DEBUG_PORT1) || defined(CONFIG_ETRAX_DEBUG_PORT2) || \
  	defined(CONFIG_ETRAX_DEBUG_PORT3)
  	reg_pinmux_rw_hwprot hwprot;
  
  #ifdef CONFIG_CRIS_MACH_ARTPEC3
  	reg_clkgen_rw_clk_ctrl clk_ctrl;
  
  	/* Enable corresponding clock region when serial 1..3 selected */
  
  	clk_ctrl = REG_RD(clkgen, regi_clkgen, rw_clk_ctrl);
  	clk_ctrl.sser_ser_dma6_7 = regk_clkgen_yes;
  	REG_WR(clkgen, regi_clkgen, rw_clk_ctrl, clk_ctrl);
  #endif
  
  	/* pinmux setup for ports 1..3 */
  	hwprot = REG_RD(pinmux, regi_pinmux, rw_hwprot);
  #endif
  
  
  #ifdef CONFIG_ETRAX_DEBUG_PORT0
  	serial_setup(regi_ser0);
  #endif
  #ifdef CONFIG_ETRAX_DEBUG_PORT1
  	hwprot.ser1 = regk_pinmux_yes;
  	serial_setup(regi_ser1);
  #endif
  #ifdef CONFIG_ETRAX_DEBUG_PORT2
  	hwprot.ser2 = regk_pinmux_yes;
  	serial_setup(regi_ser2);
  #endif
  #ifdef CONFIG_ETRAX_DEBUG_PORT3
  	hwprot.ser3 = regk_pinmux_yes;
  	serial_setup(regi_ser3);
  #endif
  #if defined(CONFIG_ETRAX_DEBUG_PORT1) || defined(CONFIG_ETRAX_DEBUG_PORT2) || \
  	defined(CONFIG_ETRAX_DEBUG_PORT3)
  	REG_WR(pinmux, regi_pinmux, rw_hwprot, hwprot);
  #endif
  
  	/* input_data is set in head.S */
  	inbuf = input_data;
  #else /* CRISv10 */
  	/* Need at least a crisv10 to run. */
  	compile_rev = 10;
  
  	/* input_data is set in head.S */
  	inbuf = input_data;
  
  #ifdef CONFIG_ETRAX_DEBUG_PORT0
  	*R_SERIAL0_XOFF = 0;
  	*R_SERIAL0_BAUD = 0x99;
  	*R_SERIAL0_TR_CTRL = 0x40;
  #endif
  #ifdef CONFIG_ETRAX_DEBUG_PORT1
  	*R_SERIAL1_XOFF = 0;
  	*R_SERIAL1_BAUD = 0x99;
  	*R_SERIAL1_TR_CTRL = 0x40;
  #endif
  #ifdef CONFIG_ETRAX_DEBUG_PORT2
  	*R_GEN_CONFIG = 0x08;
  	*R_SERIAL2_XOFF = 0;
  	*R_SERIAL2_BAUD = 0x99;
  	*R_SERIAL2_TR_CTRL = 0x40;
  #endif
  #ifdef CONFIG_ETRAX_DEBUG_PORT3
  	*R_GEN_CONFIG = 0x100;
  	*R_SERIAL3_XOFF = 0;
  	*R_SERIAL3_BAUD = 0x99;
  	*R_SERIAL3_TR_CTRL = 0x40;
  #endif
  #endif
  
  	setup_normal_output_buffer();
  
  	makecrc();
  
  	__asm__ volatile ("move $vr,%0" : "=rm" (revision));
  	if (revision < compile_rev) {
  #ifdef CONFIG_ETRAX_ARCH_V32
  		aputs("You need at least ETRAX FS to run Linux 2.6/crisv32\n");
  #else
  		aputs("You need an ETRAX 100LX to run linux 2.6/crisv10\n");
  #endif
  		while(1);
  	}
  
  	aputs("Uncompressing Linux...\n");
  	gunzip();
  	aputs("Done. Now booting the kernel\n");
  }
  