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