patch-2.4.5 linux/arch/ppc/boot/common/misc-simple.c

• Lines: 183
• Date: Thu May 24 15:02:06 2001
• Orig file: v2.4.4/linux/arch/ppc/boot/common/misc-simple.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.4/linux/arch/ppc/boot/common/misc-simple.c linux/arch/ppc/boot/common/misc-simple.c
@@ -0,0 +1,182 @@
+/*
+ * arch/ppc/common/misc-simple.c
+ *
+ * Misc. bootloader code for many machines.  This assumes you have are using
+ * a 6xx/7xx/74xx CPU in your machine.  This assumes the chunk of memory
+ * below 8MB is free.  Finally, it assumes you have a NS16550-style uart for 
+ * your serial console.  If a machine meets these requirements, it can quite
+ * likely use this code during boot.
+ * 
+ * Author: Matt Porter <mporter@mvista.com>
+ * Derived from arch/ppc/boot/prep/misc.c
+ *
+ * Copyright 2001 MontaVista Software Inc.
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/types.h>
+#include <linux/elf.h>
+#include <linux/config.h>
+
+#include <asm/page.h>
+#include <asm/processor.h>
+#include <asm/mmu.h>
+
+#include "zlib.h"
+
+unsigned long com_port;
+
+char *avail_ram;
+char *end_avail;
+extern char _end[];
+
+#ifdef CONFIG_CMDLINE
+#define CMDLINE CONFIG_CMDLINE
+#else
+#define CMDLINE ""
+#endif
+char cmd_preset[] = CMDLINE;
+char cmd_buf[256];
+char *cmd_line = cmd_buf;
+
+unsigned long initrd_start = 0, initrd_end = 0;
+char *zimage_start;
+int zimage_size;
+
+extern void puts(const char *);
+extern void putc(const char c);
+extern void puthex(unsigned long val);
+extern void *memcpy(void * __dest, __const void * __src,
+			    __kernel_size_t __n);
+extern void gunzip(void *, int, unsigned char *, int *);
+extern void udelay(long delay);
+extern int tstc(void);
+extern int getc(void);
+extern volatile unsigned long serial_init(int chan);
+
+void
+decompress_kernel(unsigned long load_addr, int num_words, unsigned long cksum)
+{
+
+	int timer = 0;
+	extern unsigned long start;
+	char *cp, ch;
+
+	com_port = serial_init(0);
+
+	/* assume the chunk below 8M is free */
+	end_avail = (char *)0x00800000;
+
+	/*
+	 * Reveal where we were loaded at and where we
+	 * were relocated to.
+	 */
+	puts("loaded at:     "); puthex(load_addr);
+	puts(" "); puthex((unsigned long)(load_addr + (4*num_words))); puts("\n");
+	if ( (unsigned long)load_addr != (unsigned long)&start )
+	{
+		puts("relocated to:  "); puthex((unsigned long)&start);
+		puts(" ");
+		puthex((unsigned long)((unsigned long)&start + (4*num_words)));
+		puts("\n");
+	}
+
+	/* we have to subtract 0x10000 here to correct for objdump including
+	   the size of the elf header which we strip -- Cort */
+	zimage_start = (char *)(load_addr - 0x10000 + ZIMAGE_OFFSET);
+	zimage_size = ZIMAGE_SIZE;
+
+	if ( INITRD_OFFSET )
+		initrd_start = load_addr - 0x10000 + INITRD_OFFSET;
+	else
+		initrd_start = 0;
+	initrd_end = INITRD_SIZE + initrd_start;
+
+	/*
+	 * Find a place to stick the zimage and initrd and 
+	 * relocate them if we have to. -- Cort
+	 */
+	avail_ram = (char *)PAGE_ALIGN((unsigned long)_end);
+	puts("zimage at:     "); puthex((unsigned long)zimage_start);
+	puts(" "); puthex((unsigned long)(zimage_size+zimage_start)); puts("\n");
+	if ( (unsigned long)zimage_start <= 0x00800000 )
+	{
+		memcpy( (void *)avail_ram, (void *)zimage_start, zimage_size );
+		zimage_start = (char *)avail_ram;
+		puts("relocated to:  "); puthex((unsigned long)zimage_start);
+		puts(" ");
+		puthex((unsigned long)zimage_size+(unsigned long)zimage_start);
+		puts("\n");
+
+		/* relocate initrd */
+		if ( initrd_start )
+		{
+			puts("initrd at:     "); puthex(initrd_start);
+			puts(" "); puthex(initrd_end); puts("\n");
+			avail_ram = (char *)PAGE_ALIGN(
+				(unsigned long)zimage_size+(unsigned long)zimage_start);
+			memcpy ((void *)avail_ram, (void *)initrd_start, INITRD_SIZE );
+			initrd_start = (unsigned long)avail_ram;
+			initrd_end = initrd_start + INITRD_SIZE;
+			puts("relocated to:  "); puthex(initrd_start);
+			puts(" "); puthex(initrd_end); puts("\n");
+		}
+	} else if ( initrd_start ) {
+		puts("initrd at:     "); puthex(initrd_start);
+		puts(" "); puthex(initrd_end); puts("\n");
+	}
+
+	avail_ram = (char *)0x00400000;
+	end_avail = (char *)0x00800000;
+	puts("avail ram:     "); puthex((unsigned long)avail_ram); puts(" ");
+	puthex((unsigned long)end_avail); puts("\n");
+
+	/* Display standard Linux/PPC boot prompt for kernel args */
+	puts("\nLinux/PPC load: ");
+	cp = cmd_line;
+	memcpy (cmd_line, cmd_preset, sizeof(cmd_preset));
+	while ( *cp ) putc(*cp++);
+	while (timer++ < 5*1000) {
+		if (tstc()) {
+			while ((ch = getc()) != '\n' && ch != '\r') {
+				/* Test for backspace/delete */
+				if (ch == '\b' || ch == '\177') {
+					if (cp != cmd_line) {
+						cp--;
+						puts("\b \b");
+					}
+				/* Test for ^x/^u (and wipe the line) */
+				} else if (ch == '\030' || ch == '\025') {
+					while (cp != cmd_line) {
+						cp--;
+						puts("\b \b");
+					}
+				} else {
+					*cp++ = ch;
+					putc(ch);
+				}
+			}
+			break;  /* Exit 'timer' loop */
+		}
+		udelay(1000);  /* 1 msec */
+	}
+	*cp = 0;
+	puts("\n");
+
+	/* mappings on early boot can only handle 16M */
+	if ( (int)(cmd_line[0]) > (16<<20))
+		puts("cmd_line located > 16M\n");
+	if ( initrd_start > (16<<20))
+		puts("initrd_start located > 16M\n");
+       
+	puts("Uncompressing Linux...");
+
+	gunzip(0, 0x400000, zimage_start, &zimage_size);
+	puts("done.\n");
+
+	puts("Now booting the kernel\n");
+}