patch-2.4.5 linux/arch/ppc/boot/tree/main.c
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- Lines: 249
- Date:
Thu May 24 15:02:07 2001
- Orig file:
v2.4.4/linux/arch/ppc/boot/tree/main.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.4/linux/arch/ppc/boot/tree/main.c linux/arch/ppc/boot/tree/main.c
@@ -0,0 +1,248 @@
+/*
+ * BK Id: SCCS/s.main.c 1.7 05/18/01 06:20:29 patch
+ */
+/*
+ * Copyright (c) 1997 Paul Mackerras <paulus@cs.anu.edu.au>
+ * Initial Power Macintosh COFF version.
+ * Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu>
+ * Modifications for an ELF-based IBM evaluation board version.
+ * Copyright 2000-2001 MontaVista Software Inc.
+ * PPC405GP modifications
+ * Author: MontaVista Software, Inc.
+ * frank_rowand@mvista.com or source@mvista.com
+ * debbie_chu@mvista.com
+ *
+ * Module name: main.c
+ *
+ * Description:
+ * This module does most of the real work for the boot loader. It
+ * checks the variables holding the absolute start address and size
+ * of the Linux kernel "image" and initial RAM disk "initrd" sections
+ * and if they are present, moves them to their "proper" locations.
+ *
+ * For the Linux kernel, "proper" is physical address 0x00000000.
+ * For the RAM disk, "proper" is the image's size below the top
+ * of physical memory. The Linux kernel may be in either raw
+ * binary form or compressed with GNU zip (aka gzip).
+ *
+ * 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/config.h>
+#include <asm/ppc4xx.h>
+
+#include "nonstdio.h"
+#include "irSect.h"
+#if defined(CONFIG_SERIAL_CONSOLE)
+#include "ns16550.h"
+#endif /* CONFIG_SERIAL_CONSOLE */
+
+
+/* Preprocessor Defines */
+
+/*
+ * Location of the IBM boot ROM function pointer address for retrieving
+ * the board information structure.
+ */
+
+#define BOARD_INFO_VECTOR 0xFFFE0B50
+
+/*
+ * Warning: the board_info doesn't contain valid data until get_board_info()
+ * gets called in start().
+ */
+#define RAM_SIZE board_info.bi_memsize
+
+#define RAM_PBASE 0x00000000
+#define RAM_PEND (RAM_PBASE + RAM_SIZE)
+
+#define RAM_VBASE 0xC0000000
+#define RAM_VEND (RAM_VBASE + RAM_SIZE)
+
+#define RAM_START RAM_PBASE
+#define RAM_END RAM_PEND
+#define RAM_FREE (imageSect_start + imageSect_size + initrdSect_size)
+
+#define PROG_START RAM_START
+
+
+/* Function Macros */
+
+#define ALIGN_UP(x, align) (((x) + ((align) - 1)) & ~((align) - 1))
+
+#define stringify(s) tostring(s)
+#define tostring(s) #s
+
+#define mtdcr(rn, v) asm volatile("mtdcr " stringify(rn) ",%0" : : "r" (v))
+#define mfdcr(rn) ({unsigned int rval; \
+ asm volatile("mfdcr %0," stringify(rn) \
+ : "=r" (rval)); rval;})
+#define DCRN_MALCR 0x180 /* MAL Configuration */
+#define MALCR_SR 0x80000000 /* Software Reset */
+
+/* Global Variables */
+
+/* Needed by zalloc and zfree for allocating memory */
+
+char *avail_ram; /* Indicates start of RAM available for heap */
+char *end_avail; /* Indicates end of RAM available for heap */
+
+bd_t board_info;
+
+/*
+ * XXX - Until either the IBM boot ROM provides a way of passing arguments to
+ * the program it launches or until I/O is working in the boot loader,
+ * this is a good spot to pass in command line arguments to the kernel
+ * (e.g. console=tty0).
+ */
+
+
+/*
+** The bootrom may change bootrom_cmdline to point to a buffer in the
+** bootrom.
+*/
+char *bootrom_cmdline = "";
+char treeboot_bootrom_cmdline[512];
+
+#ifdef CONFIG_CMDLINE
+char *cmdline = CONFIG_CMDLINE;
+#else
+char *cmdline = "";
+#endif
+
+/* Function Prototypes */
+
+extern void *zalloc(void *x, unsigned items, unsigned size);
+
+/* serial I/O functions.
+ * These should have generic names, although this is similar to 16550....
+ */
+static volatile unsigned char *uart0_lsr = (unsigned char *)0xef600305;
+static volatile unsigned char *uart0_xcvr = (unsigned char *)0xef600300;
+
+void
+serial_putc(void *unused, unsigned char c)
+{
+ while ((*uart0_lsr & LSR_THRE) == 0);
+ *uart0_xcvr = c;
+}
+
+unsigned char
+serial_getc(void *unused)
+{
+ while ((*uart0_lsr & LSR_DR) == 0);
+ return (*uart0_xcvr);
+}
+
+int
+serial_tstc(void *unused)
+{
+ return ((*uart0_lsr & LSR_DR) != 0);
+}
+
+
+void start(void)
+{
+ void *options;
+ int ns, oh, i;
+ unsigned long sa, len;
+ void *dst;
+ unsigned char *im;
+ unsigned long initrd_start, initrd_size;
+ bd_t *(*get_board_info)(void) =
+ (bd_t *(*)(void))(*(unsigned long *)BOARD_INFO_VECTOR);
+ bd_t *bip = NULL;
+ volatile unsigned long *em0mr0 = (long *)0xEF600800; /* ftr fixup */
+
+
+
+#if defined(CONFIG_WALNUT)
+ /* turn off ethernet */
+ /* This is to fix a problem with early walnut bootrom. */
+
+ mtdcr(DCRN_MALCR, MALCR_SR); /* 1st reset MAL */
+
+ while (mfdcr(DCRN_MALCR) & MALCR_SR) {}; /* wait for the reset */
+
+ *em0mr0 = 0x20000000; /* then reset EMAC */
+#endif
+
+
+#if 0
+ /* ftr revisit - remove printf()s */
+
+ printf("\n\nbootrom_cmdline = >%s<\n\n", bootrom_cmdline);
+ if (*bootrom_cmdline != '\0') {
+ printf("bootrom_cmdline != NULL, copying it into cmdline\n\n");
+ *treeboot_bootrom_cmdline = '\0';
+ strcat(treeboot_bootrom_cmdline, bootrom_cmdline);
+ cmdline = treeboot_bootrom_cmdline;
+ }
+#endif
+
+
+ if ((bip = get_board_info()) != NULL)
+ memcpy(&board_info, bip, sizeof(bd_t));
+
+ /* Init RAM disk (initrd) section */
+
+ if (initrdSect_start != 0 && (initrd_size = initrdSect_size) != 0) {
+ initrd_start = (RAM_END - initrd_size) & ~0xFFF;
+
+ _printk("Initial RAM disk at 0x%08x (%u bytes)\n",
+ initrd_start, initrd_size);
+
+ memcpy((char *)initrd_start,
+ (char *)(initrdSect_start),
+ initrdSect_size);
+
+ end_avail = (char *)initrd_start;
+ } else {
+ initrd_start = initrd_size = 0;
+ end_avail = (char *)RAM_END;
+ }
+
+ /* Linux kernel image section */
+
+ im = (unsigned char *)(imageSect_start);
+ len = imageSect_size;
+ dst = (void *)PROG_START;
+
+ /* Check for the gzip archive magic numbers */
+
+ if (im[0] == 0x1f && im[1] == 0x8b) {
+
+ /* The gunzip routine needs everything nice and aligned */
+
+ void *cp = (void *)ALIGN_UP(RAM_FREE, 8);
+ avail_ram = (void *)(cp + ALIGN_UP(len, 8)); /* used by zalloc() */
+ memcpy(cp, im, len);
+
+ /* I'm not sure what the 0x200000 parameter is for, but it works. */
+ /* It tells gzip the end of the area you wish to reserve, and it
+ * can use data past that point....unfortunately, this value
+ * isn't big enough (luck ran out). -- Dan
+ */
+
+ gunzip(dst, 0x400000, cp, (int *)&len);
+ } else {
+ memmove(dst, im, len);
+ }
+
+
+ flush_cache(dst, len);
+
+ sa = (unsigned long)dst;
+
+ (*(void (*)())sa)(&board_info,
+ initrd_start,
+ initrd_start + initrd_size,
+ cmdline,
+ cmdline + strlen(cmdline));
+
+ pause();
+}
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