Initial import

1 files changed, 393 insertions, 0 deletions

diff --git a/arch/mn10300/boot/compressed/misc.c b/arch/mn10300/boot/compressed/misc.c
new file mode 100644
index 000000000..42cbd77bd
--- /dev/null
+++ b/arch/mn10300/boot/compressed/misc.c
@@ -0,0 +1,393 @@
+/* MN10300 Miscellaneous helper routines for kernel decompressor
+ *
+ * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Modified by David Howells (dhowells@redhat.com)
+ * - Derived from arch/x86/boot/compressed/misc_32.c
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public Licence
+ * as published by the Free Software Foundation; either version
+ * 2 of the Licence, or (at your option) any later version.
+ */
+#include <linux/compiler.h>
+#include <asm/serial-regs.h>
+#include "misc.h"
+
+#ifndef CONFIG_GDBSTUB_ON_TTYSx
+/* display 'Uncompressing Linux... ' messages on ttyS0 or ttyS1 */
+#if 1	/* ttyS0 */
+#define CYG_DEV_BASE	0xA6FB0000
+#else   /* ttyS1 */
+#define CYG_DEV_BASE	0xA6FC0000
+#endif
+
+#define CYG_DEV_THR	(*((volatile __u8*)(CYG_DEV_BASE + 0x00)))
+#define CYG_DEV_MCR	(*((volatile __u8*)(CYG_DEV_BASE + 0x10)))
+#define SIO_MCR_DTR	0x01
+#define SIO_MCR_RTS	0x02
+#define CYG_DEV_LSR	(*((volatile __u8*)(CYG_DEV_BASE + 0x14)))
+#define SIO_LSR_THRE	0x20		/* transmitter holding register empty */
+#define SIO_LSR_TEMT	0x40		/* transmitter register empty */
+#define CYG_DEV_MSR	(*((volatile __u8*)(CYG_DEV_BASE + 0x18)))
+#define SIO_MSR_CTS	0x10		/* clear to send */
+#define SIO_MSR_DSR	0x20		/* data set ready */
+
+#define LSR_WAIT_FOR(STATE) \
+	do { while (!(CYG_DEV_LSR & SIO_LSR_##STATE)) {} } while (0)
+#define FLOWCTL_QUERY(LINE) \
+	({ CYG_DEV_MSR & SIO_MSR_##LINE; })
+#define FLOWCTL_WAIT_FOR(LINE) \
+	do { while (!(CYG_DEV_MSR & SIO_MSR_##LINE)) {} } while (0)
+#define FLOWCTL_CLEAR(LINE) \
+	do { CYG_DEV_MCR &= ~SIO_MCR_##LINE; } while (0)
+#define FLOWCTL_SET(LINE) \
+	do { CYG_DEV_MCR |= SIO_MCR_##LINE; } while (0)
+#endif
+
+/*
+ * gzip declarations
+ */
+
+#define OF(args)  args
+#define STATIC static
+
+#undef memset
+#undef memcpy
+
+static inline void *memset(const void *s, int c, size_t n)
+{
+	int i;
+	char *ss = (char *) s;
+
+	for (i = 0; i < n; i++)
+		ss[i] = c;
+	return (void *)s;
+}
+
+#define memzero(s, n) memset((s), 0, (n))
+
+static inline void *memcpy(void *__dest, const void *__src, size_t __n)
+{
+	int i;
+	const char *s = __src;
+	char *d = __dest;
+
+	for (i = 0; i < __n; i++)
+		d[i] = s[i];
+	return __dest;
+}
+
+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 */
+
+/* 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(const char *) __attribute__((noreturn));
+static void kputs(const char *);
+
+static inline unsigned char get_byte(void)
+{
+	unsigned char ch = inptr < insize ? inbuf[inptr++] : fill_inbuf();
+
+#if 0
+	char hex[3];
+	hex[0] = ((ch & 0x0f) > 9) ?
+		((ch & 0x0f) + 'A' - 0xa) : ((ch & 0x0f) + '0');
+	hex[1] = ((ch >> 4) > 9) ?
+		((ch >> 4) + 'A' - 0xa) : ((ch >> 4) + '0');
+	hex[2] = 0;
+	kputs(hex);
+#endif
+	return ch;
+}
+
+/*
+ * This is set up by the setup-routine at boot-time
+ */
+#define EXT_MEM_K (*(unsigned short *)0x90002)
+#ifndef STANDARD_MEMORY_BIOS_CALL
+#define ALT_MEM_K (*(unsigned long *) 0x901e0)
+#endif
+#define SCREEN_INFO (*(struct screen_info *)0x90000)
+
+static long bytes_out;
+static uch *output_data;
+static unsigned long output_ptr;
+
+
+static unsigned long free_mem_ptr = (unsigned long) &end;
+static unsigned long free_mem_end_ptr = (unsigned long) &end + 0x90000;
+
+#define INPLACE_MOVE_ROUTINE	0x1000
+#define LOW_BUFFER_START	0x2000
+#define LOW_BUFFER_END		0x90000
+#define LOW_BUFFER_SIZE		(LOW_BUFFER_END - LOW_BUFFER_START)
+#define HEAP_SIZE		0x3000
+static int high_loaded;
+static uch *high_buffer_start /* = (uch *)(((ulg)&end) + HEAP_SIZE)*/;
+
+static char *vidmem = (char *)0xb8000;
+static int lines, cols;
+
+#define BOOTLOADER_INFLATE
+#include "../../../../lib/inflate.c"
+
+static inline void scroll(void)
+{
+	int i;
+
+	memcpy(vidmem, vidmem + cols * 2, (lines - 1) * cols * 2);
+	for (i = (lines - 1) * cols * 2; i < lines * cols * 2; i += 2)
+		vidmem[i] = ' ';
+}
+
+static inline void kputchar(unsigned char ch)
+{
+#ifdef CONFIG_MN10300_UNIT_ASB2305
+	while (SC0STR & SC01STR_TBF)
+		continue;
+
+	if (ch == 0x0a) {
+		SC0TXB = 0x0d;
+		while (SC0STR & SC01STR_TBF)
+			continue;
+	}
+
+	SC0TXB = ch;
+
+#else
+	while (SC1STR & SC01STR_TBF)
+		continue;
+
+	if (ch == 0x0a) {
+		SC1TXB = 0x0d;
+		while (SC1STR & SC01STR_TBF)
+			continue;
+	}
+
+	SC1TXB = ch;
+
+#endif
+}
+
+static void kputs(const char *s)
+{
+#ifdef CONFIG_DEBUG_DECOMPRESS_KERNEL
+#ifndef CONFIG_GDBSTUB_ON_TTYSx
+	char ch;
+
+	FLOWCTL_SET(DTR);
+
+	while (*s) {
+		LSR_WAIT_FOR(THRE);
+
+		ch = *s++;
+		if (ch == 0x0a) {
+			CYG_DEV_THR = 0x0d;
+			LSR_WAIT_FOR(THRE);
+		}
+		CYG_DEV_THR = ch;
+	}
+
+	FLOWCTL_CLEAR(DTR);
+#else
+
+	for (; *s; s++)
+		kputchar(*s);
+
+#endif
+#endif /* CONFIG_DEBUG_DECOMPRESS_KERNEL */
+}
+
+/* ===========================================================================
+ * Fill the input buffer. This is called only when the buffer is empty
+ * and at least one byte is really needed.
+ */
+static int fill_inbuf()
+{
+	if (insize != 0)
+		error("ran out of input data\n");
+
+	inbuf = input_data;
+	insize = input_len;
+	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.)
+ */
+static void flush_window_low(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++;
+	    c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
+    }
+    crc = c;
+    bytes_out += (ulg)outcnt;
+    output_ptr += (ulg)outcnt;
+    outcnt = 0;
+}
+
+static void flush_window_high(void)
+{
+    ulg c = crc;         /* temporary variable */
+    unsigned n;
+    uch *in,  ch;
+    in = window;
+    for (n = 0; n < outcnt; n++) {
+	ch = *output_data++ = *in++;
+	if ((ulg) output_data == LOW_BUFFER_END)
+		output_data = high_buffer_start;
+	c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
+    }
+    crc = c;
+    bytes_out += (ulg)outcnt;
+    outcnt = 0;
+}
+
+static void flush_window(void)
+{
+	if (high_loaded)
+		flush_window_high();
+	else
+		flush_window_low();
+}
+
+static void error(const char *x)
+{
+	kputs("\n\n");
+	kputs(x);
+	kputs("\n\n -- System halted");
+
+	while (1)
+		/* Halt */;
+}
+
+#define STACK_SIZE (4096)
+
+long user_stack[STACK_SIZE];
+
+struct {
+	long *a;
+	short b;
+} stack_start = { &user_stack[STACK_SIZE], 0 };
+
+void setup_normal_output_buffer(void)
+{
+#ifdef STANDARD_MEMORY_BIOS_CALL
+	if (EXT_MEM_K < 1024)
+		error("Less than 2MB of memory.\n");
+#else
+	if ((ALT_MEM_K > EXT_MEM_K ? ALT_MEM_K : EXT_MEM_K) < 1024)
+		error("Less than 2MB of memory.\n");
+#endif
+	output_data = (char *) 0x100000; /* Points to 1M */
+}
+
+struct moveparams {
+	uch *low_buffer_start;
+	int lcount;
+	uch *high_buffer_start;
+	int hcount;
+};
+
+void setup_output_buffer_if_we_run_high(struct moveparams *mv)
+{
+	high_buffer_start = (uch *)(((ulg) &end) + HEAP_SIZE);
+#ifdef STANDARD_MEMORY_BIOS_CALL
+	if (EXT_MEM_K < (3 * 1024))
+		error("Less than 4MB of memory.\n");
+#else
+	if ((ALT_MEM_K > EXT_MEM_K ? ALT_MEM_K : EXT_MEM_K) < (3 * 1024))
+		error("Less than 4MB of memory.\n");
+#endif
+	mv->low_buffer_start = output_data = (char *) LOW_BUFFER_START;
+	high_loaded = 1;
+	free_mem_end_ptr = (long) high_buffer_start;
+	if (0x100000 + LOW_BUFFER_SIZE > (ulg) high_buffer_start) {
+		high_buffer_start = (uch *)(0x100000 + LOW_BUFFER_SIZE);
+		mv->hcount = 0; /* say: we need not to move high_buffer */
+	} else {
+		mv->hcount = -1;
+	}
+	mv->high_buffer_start = high_buffer_start;
+}
+
+void close_output_buffer_if_we_run_high(struct moveparams *mv)
+{
+	mv->lcount = bytes_out;
+	if (bytes_out > LOW_BUFFER_SIZE) {
+		mv->lcount = LOW_BUFFER_SIZE;
+		if (mv->hcount)
+			mv->hcount = bytes_out - LOW_BUFFER_SIZE;
+	} else {
+		mv->hcount = 0;
+	}
+}
+
+#undef DEBUGFLAG
+#ifdef DEBUGFLAG
+int debugflag;
+#endif
+
+int decompress_kernel(struct moveparams *mv)
+{
+#ifdef DEBUGFLAG
+	while (!debugflag)
+		barrier();
+#endif
+
+	output_data = (char *) CONFIG_KERNEL_TEXT_ADDRESS;
+
+	makecrc();
+	kputs("Uncompressing Linux... ");
+	gunzip();
+	kputs("Ok, booting the kernel.\n");
+	return 0;
+}