+++ /dev/null
-/*
- * Originally adapted by Gary Thomas. Much additional work by
- * Cort Dougan <cort@fsmlabs.com>. On top of that still more work by
- * Dan Malek <dmalek@jlc.net>.
- *
- * Currently maintained by: Tom Rini <trini@kernel.crashing.org>
- */
-
-#include <linux/types.h>
-#include <linux/string.h>
-#include <asm/bootinfo.h>
-#include <asm/mmu.h>
-#include <asm/page.h>
-#include <asm/residual.h>
-#if defined(CONFIG_4xx)
-#include <asm/ibm4xx.h>
-#elif defined(CONFIG_8xx)
-#include <asm/mpc8xx.h>
-#elif defined(CONFIG_8260)
-#include <asm/mpc8260.h>
-#endif
-
-#include "nonstdio.h"
-
-/* The linker tells us where the image is. */
-extern char __image_begin, __image_end;
-extern char __ramdisk_begin, __ramdisk_end;
-extern char _end[];
-
-/* Because of the limited amount of memory on embedded, it presents
- * loading problems. The biggest is that we load this boot program
- * into a relatively low memory address, and the Linux kernel Bss often
- * extends into this space when it get loaded. When the kernel starts
- * and zeros the BSS space, it also writes over the information we
- * save here and pass to the kernel (usually board info).
- * On these boards, we grab some known memory holes to hold this information.
- */
-char cmd_buf[256];
-char *cmd_line = cmd_buf;
-char *avail_ram;
-char *end_avail;
-char *zimage_start;
-
-/* This is for 4xx treeboot. It provides a place for the bootrom
- * give us a pointer to a rom environment command line.
- */
-char *bootrom_cmdline = "";
-
-/* This is the default cmdline that will be given to the user at boot time..
- * If none was specified at compile time, we'll give it one that should work.
- * -- Tom */
-#ifdef CONFIG_CMDLINE_BOOL
-char compiled_string[] = CONFIG_CMDLINE;
-#endif
-char ramroot_string[] = "root=/dev/ram";
-char netroot_string[] = "root=/dev/nfs rw ip=on";
-
-/* Serial port to use. */
-unsigned long com_port;
-
-/* We need to make sure that this is before the images to ensure
- * that it's in a mapped location. - Tom */
-bd_t hold_resid_buf __attribute__ ((__section__ (".data.boot")));
-bd_t *hold_residual = &hold_resid_buf;
-
-extern unsigned long serial_init(int chan, bd_t *bp);
-extern void serial_close(unsigned long com_port);
-extern unsigned long start;
-extern void flush_instruction_cache(void);
-extern void gunzip(void *, int, unsigned char *, int *);
-extern void embed_config(bd_t **bp);
-
-/* Weak function for boards which don't need to build the
- * board info struct because they are using PPCBoot/U-Boot.
- */
-void __attribute__ ((weak))
-embed_config(bd_t **bdp)
-{
-}
-
-unsigned long
-load_kernel(unsigned long load_addr, int num_words, unsigned long cksum, bd_t *bp)
-{
- char *cp, ch;
- int timer = 0, zimage_size;
- unsigned long initrd_size;
-
- /* First, capture the embedded board information. Then
- * initialize the serial console port.
- */
- embed_config(&bp);
-#if defined(CONFIG_SERIAL_CPM_CONSOLE) || \
- defined(CONFIG_SERIAL_8250_CONSOLE) || \
- defined(CONFIG_SERIAL_UARTLITE_CONSOLE)
- com_port = serial_init(0, bp);
-#endif
-
- /* Grab some space for the command line and board info. Since
- * we no longer use the ELF header, but it was loaded, grab
- * that space.
- */
-#ifdef CONFIG_MBX
- /* Because of the way the MBX loads the ELF image, we can't
- * tell where we started. We read a magic variable from the NVRAM
- * that gives us the intermediate buffer load address.
- */
- load_addr = *(uint *)0xfa000020;
- load_addr += 0x10000; /* Skip ELF header */
-#endif
- /* copy board data */
- if (bp)
- memcpy(hold_residual,bp,sizeof(bd_t));
-
- /* Set end of memory available to us. It is always the highest
- * memory address provided by the board information.
- */
- end_avail = (char *)(bp->bi_memsize);
-
- puts("\nloaded 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");
- }
-
- if ( bp ) {
- puts("board data at: "); puthex((unsigned long)bp);
- puts(" ");
- puthex((unsigned long)((unsigned long)bp + sizeof(bd_t)));
- puts("\nrelocated to: ");
- puthex((unsigned long)hold_residual);
- puts(" ");
- puthex((unsigned long)((unsigned long)hold_residual + sizeof(bd_t)));
- puts("\n");
- }
-
- /*
- * We link ourself to an arbitrary low address. When we run, we
- * relocate ourself to that address. __image_being points to
- * the part of the image where the zImage is. -- 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
- */
- 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");
- }
-
- /*
- * setup avail_ram - this is the first part of ram usable
- * by the uncompress code. Anything after this program in RAM
- * is now fair game. -- Tom
- */
- avail_ram = (char *)PAGE_ALIGN((unsigned long)_end);
-
- puts("avail ram: "); puthex((unsigned long)avail_ram); puts(" ");
- puthex((unsigned long)end_avail); puts("\n");
- puts("\nLinux/PPC load: ");
- cp = cmd_line;
- /* This is where we try and pick the right command line for booting.
- * If we were given one at compile time, use it. It Is Right.
- * If we weren't, see if we have a ramdisk. If so, thats root.
- * When in doubt, give them the netroot (root=/dev/nfs rw) -- Tom
- */
-#ifdef CONFIG_CMDLINE_BOOL
- memcpy (cmd_line, compiled_string, sizeof(compiled_string));
-#else
- if ( initrd_size )
- memcpy (cmd_line, ramroot_string, sizeof(ramroot_string));
- else
- memcpy (cmd_line, netroot_string, sizeof(netroot_string));
-#endif
- while ( *cp )
- putc(*cp++);
- while (timer++ < 5*1000) {
- if (tstc()) {
- while ((ch = getc()) != '\n' && ch != '\r') {
- if (ch == '\b' || ch == '\177') {
- if (cp != cmd_line) {
- cp--;
- puts("\b \b");
- }
- } else if (ch == '\030' /* ^x */
- || ch == '\025') { /* ^u */
- while (cp != cmd_line) {
- cp--;
- puts("\b \b");
- }
- } else {
- *cp++ = ch;
- putc(ch);
- }
- }
- break; /* Exit 'timer' loop */
- }
- udelay(1000); /* 1 msec */
- }
- *cp = 0;
- puts("\nUncompressing Linux...");
-
- gunzip(0, 0x400000, zimage_start, &zimage_size);
- flush_instruction_cache();
- puts("done.\n");
- {
- struct bi_record *rec;
- unsigned long initrd_loc = 0;
- unsigned long rec_loc = _ALIGN((unsigned long)(zimage_size) +
- (1 << 20) - 1, (1 << 20));
- rec = (struct bi_record *)rec_loc;
-
- /* We need to make sure that the initrd and bi_recs do not
- * overlap. */
- if ( initrd_size ) {
- 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");
- }
- }
-
- rec->tag = BI_FIRST;
- rec->size = sizeof(struct bi_record);
- rec = (struct bi_record *)((unsigned long)rec + rec->size);
-
- rec->tag = BI_CMD_LINE;
- memcpy( (char *)rec->data, cmd_line, strlen(cmd_line)+1);
- rec->size = sizeof(struct bi_record) + strlen(cmd_line) + 1;
- rec = (struct bi_record *)((unsigned long)rec + rec->size);
-
- if ( initrd_size ) {
- rec->tag = BI_INITRD;
- rec->data[0] = initrd_loc;
- rec->data[1] = initrd_size;
- rec->size = sizeof(struct bi_record) + 2 *
- sizeof(unsigned long);
- rec = (struct bi_record *)((unsigned long)rec +
- rec->size);
- }
-
- rec->tag = BI_LAST;
- rec->size = sizeof(struct bi_record);
- rec = (struct bi_record *)((unsigned long)rec + rec->size);
- }
- puts("Now booting the kernel\n");
-#if defined(CONFIG_SERIAL_CPM_CONSOLE) || defined(CONFIG_SERIAL_8250_CONSOLE)
- serial_close(com_port);
-#endif
-
- return (unsigned long)hold_residual;
-}
git.samba.org / sfrench / cifs-2.6.git / blobdiff