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/*
* 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);
}
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