279 lines
7.2 KiB
C
279 lines
7.2 KiB
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
|
|
*
|
|
* 2001 (c) MontaVista, Software, Inc. This file is licensed under
|
|
* the terms of the GNU General Public License version 2. This program
|
|
* is licensed "as is" without any warranty of any kind, whether express
|
|
* or implied.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
|
|
#include <asm/page.h>
|
|
#include <asm/mmu.h>
|
|
#include <asm/bootinfo.h>
|
|
#ifdef CONFIG_4xx
|
|
#include <asm/ibm4xx.h>
|
|
#endif
|
|
#include <asm/reg.h>
|
|
|
|
#include "nonstdio.h"
|
|
|
|
/* Default cmdline */
|
|
#ifdef CONFIG_CMDLINE
|
|
#define CMDLINE CONFIG_CMDLINE
|
|
#else
|
|
#define CMDLINE ""
|
|
#endif
|
|
|
|
/* Keyboard (and VGA console)? */
|
|
#ifdef CONFIG_VGA_CONSOLE
|
|
#define HAS_KEYB 1
|
|
#else
|
|
#define HAS_KEYB 0
|
|
#endif
|
|
|
|
/* Will / Can the user give input?
|
|
*/
|
|
#if (defined(CONFIG_SERIAL_8250_CONSOLE) \
|
|
|| defined(CONFIG_VGA_CONSOLE) \
|
|
|| defined(CONFIG_SERIAL_MPC52xx_CONSOLE) \
|
|
|| defined(CONFIG_SERIAL_MPSC_CONSOLE))
|
|
#define INTERACTIVE_CONSOLE 1
|
|
#endif
|
|
|
|
char *avail_ram;
|
|
char *end_avail;
|
|
char *zimage_start;
|
|
char cmd_preset[] = CMDLINE;
|
|
char cmd_buf[256];
|
|
char *cmd_line = cmd_buf;
|
|
int keyb_present = HAS_KEYB;
|
|
int zimage_size;
|
|
|
|
unsigned long com_port;
|
|
unsigned long initrd_size = 0;
|
|
|
|
/* The linker tells us various locations in the image */
|
|
extern char __image_begin, __image_end;
|
|
extern char __ramdisk_begin, __ramdisk_end;
|
|
extern char _end[];
|
|
/* Original location */
|
|
extern unsigned long start;
|
|
|
|
extern int CRT_tstc(void);
|
|
extern unsigned long serial_init(int chan, void *ignored);
|
|
extern void serial_close(unsigned long com_port);
|
|
extern void gunzip(void *, int, unsigned char *, int *);
|
|
extern void serial_fixups(void);
|
|
|
|
/* Allow get_mem_size to be hooked into. This is the default. */
|
|
unsigned long __attribute__ ((weak))
|
|
get_mem_size(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#if defined(CONFIG_40x)
|
|
#define PPC4xx_EMAC0_MR0 EMAC0_BASE
|
|
#endif
|
|
|
|
#if defined(CONFIG_44x) && defined(PPC44x_EMAC0_MR0)
|
|
#define PPC4xx_EMAC0_MR0 PPC44x_EMAC0_MR0
|
|
#endif
|
|
|
|
struct bi_record *
|
|
decompress_kernel(unsigned long load_addr, int num_words, unsigned long cksum)
|
|
{
|
|
#ifdef INTERACTIVE_CONSOLE
|
|
int timer = 0;
|
|
char ch;
|
|
#endif
|
|
char *cp;
|
|
struct bi_record *rec;
|
|
unsigned long initrd_loc = 0, TotalMemory = 0;
|
|
|
|
#if defined(CONFIG_SERIAL_8250_CONSOLE) || defined(CONFIG_SERIAL_MPSC_CONSOLE)
|
|
com_port = serial_init(0, NULL);
|
|
#endif
|
|
|
|
#if defined(PPC4xx_EMAC0_MR0)
|
|
/* Reset MAL */
|
|
mtdcr(DCRN_MALCR(DCRN_MAL_BASE), MALCR_MMSR);
|
|
/* Wait for reset */
|
|
while (mfdcr(DCRN_MALCR(DCRN_MAL_BASE)) & MALCR_MMSR) {};
|
|
/* Reset EMAC */
|
|
*(volatile unsigned long *)PPC4xx_EMAC0_MR0 = 0x20000000;
|
|
__asm__ __volatile__("eieio");
|
|
#endif
|
|
|
|
/*
|
|
* Call get_mem_size(), which is memory controller dependent,
|
|
* and we must have the correct file linked in here.
|
|
*/
|
|
TotalMemory = get_mem_size();
|
|
|
|
/* 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 link ourself to 0x00800000. When we run, we relocate
|
|
* ourselves there. So we just need __image_begin for the
|
|
* start. -- Tom
|
|
*/
|
|
zimage_start = (char *)(unsigned long)(&__image_begin);
|
|
zimage_size = (unsigned long)(&__image_end) -
|
|
(unsigned long)(&__image_begin);
|
|
|
|
initrd_size = (unsigned long)(&__ramdisk_end) -
|
|
(unsigned long)(&__ramdisk_begin);
|
|
|
|
/*
|
|
* The zImage and initrd will be between start and _end, so they've
|
|
* already been moved once. We're good to go now. -- Tom
|
|
*/
|
|
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 ( initrd_size ) {
|
|
puts("initrd at: ");
|
|
puthex((unsigned long)(&__ramdisk_begin));
|
|
puts(" "); puthex((unsigned long)(&__ramdisk_end));puts("\n");
|
|
}
|
|
|
|
#ifndef CONFIG_40x /* don't overwrite the 40x image located at 0x00400000! */
|
|
avail_ram = (char *)0x00400000;
|
|
#endif
|
|
end_avail = (char *)0x00800000;
|
|
puts("avail ram: "); puthex((unsigned long)avail_ram); puts(" ");
|
|
puthex((unsigned long)end_avail); puts("\n");
|
|
|
|
if (keyb_present)
|
|
CRT_tstc(); /* Forces keyboard to be initialized */
|
|
|
|
/* 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++);
|
|
|
|
#ifdef INTERACTIVE_CONSOLE
|
|
/*
|
|
* If they have a console, allow them to edit the command line.
|
|
* Otherwise, don't bother wasting the five seconds.
|
|
*/
|
|
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;
|
|
#endif
|
|
puts("\n");
|
|
|
|
puts("Uncompressing Linux...");
|
|
gunzip(NULL, 0x400000, zimage_start, &zimage_size);
|
|
puts("done.\n");
|
|
|
|
/* get the bi_rec address */
|
|
rec = bootinfo_addr(zimage_size);
|
|
|
|
/* We need to make sure that the initrd and bi_recs do not
|
|
* overlap. */
|
|
if ( initrd_size ) {
|
|
unsigned long rec_loc = (unsigned long) rec;
|
|
initrd_loc = (unsigned long)(&__ramdisk_begin);
|
|
/* If the bi_recs are in the middle of the current
|
|
* initrd, move the initrd to the next MB
|
|
* boundary. */
|
|
if ((rec_loc > initrd_loc) &&
|
|
((initrd_loc + initrd_size) > rec_loc)) {
|
|
initrd_loc = _ALIGN((unsigned long)(zimage_size)
|
|
+ (2 << 20) - 1, (2 << 20));
|
|
memmove((void *)initrd_loc, &__ramdisk_begin,
|
|
initrd_size);
|
|
puts("initrd moved: "); puthex(initrd_loc);
|
|
puts(" "); puthex(initrd_loc + initrd_size);
|
|
puts("\n");
|
|
}
|
|
}
|
|
|
|
bootinfo_init(rec);
|
|
if ( TotalMemory )
|
|
bootinfo_append(BI_MEMSIZE, sizeof(int), (void*)&TotalMemory);
|
|
|
|
bootinfo_append(BI_CMD_LINE, strlen(cmd_line)+1, (void*)cmd_line);
|
|
|
|
/* add a bi_rec for the initrd if it exists */
|
|
if (initrd_size) {
|
|
unsigned long initrd[2];
|
|
|
|
initrd[0] = initrd_loc;
|
|
initrd[1] = initrd_size;
|
|
|
|
bootinfo_append(BI_INITRD, sizeof(initrd), &initrd);
|
|
}
|
|
puts("Now booting the kernel\n");
|
|
serial_close(com_port);
|
|
|
|
return rec;
|
|
}
|
|
|
|
void __attribute__ ((weak))
|
|
board_isa_init(void)
|
|
{
|
|
}
|
|
|
|
/* Allow decompress_kernel to be hooked into. This is the default. */
|
|
void * __attribute__ ((weak))
|
|
load_kernel(unsigned long load_addr, int num_words, unsigned long cksum,
|
|
void *ign1, void *ign2)
|
|
{
|
|
board_isa_init();
|
|
return decompress_kernel(load_addr, num_words, cksum);
|
|
}
|