Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * Copyright (C) Paul Mackerras 1997.

 *

 * Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner.

 *

 * 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 <stdarg.h>

#include <stddef.h>

#include "elf.h"

#include "page.h"

#include "string.h"

#include "stdio.h"

#include "ops.h"

#include "gunzip_util.h"

#include "flatdevtree.h"

#include "reg.h"

static struct gunzip_state gzstate;

struct addr_range {

        void *addr;

        unsigned long size;

};

#undef DEBUG

static struct addr_range prep_kernel(void)

{

        char elfheader[256];

        void *vmlinuz_addr = _vmlinux_start;

        unsigned long vmlinuz_size = _vmlinux_end - _vmlinux_start;

        void *addr = 0;

        struct elf_info ei;

        int len;

        /* gunzip the ELF header of the kernel */

        gunzip_start(&gzstate, vmlinuz_addr, vmlinuz_size);

        gunzip_exactly(&gzstate, elfheader, sizeof(elfheader));

        if (!parse_elf64(elfheader, &ei) && !parse_elf32(elfheader, &ei))

                fatal("Error: not a valid PPC32 or PPC64 ELF file!\n\r");

        if (platform_ops.image_hdr)

                platform_ops.image_hdr(elfheader);

        /* We need to alloc the memsize: gzip will expand the kernel

         * text/data, then possible rubbish we don't care about. But

         * the kernel bss must be claimed (it will be zero'd by the

         * kernel itself)

         */

        printf("Allocating 0x%lx bytes for kernel ...\n\r", ei.memsize);

        if (platform_ops.vmlinux_alloc) {

                addr = platform_ops.vmlinux_alloc(ei.memsize);

        } else {

                if ((unsigned long)_start < ei.memsize)

                        fatal("Insufficient memory for kernel at address 0!"

                               " (_start=%p)\n\r", _start);

        }

        /* Finally, gunzip the kernel */

        printf("gunzipping (0x%p <- 0x%p:0x%p)...", addr,

               vmlinuz_addr, vmlinuz_addr+vmlinuz_size);

        /* discard up to the actual load data */

        gunzip_discard(&gzstate, ei.elfoffset - sizeof(elfheader));

        len = gunzip_finish(&gzstate, addr, ei.loadsize);

        if (len != ei.loadsize)

                fatal("ran out of data!  only got 0x%x of 0x%lx bytes.\n\r",

                                len, ei.loadsize);

        printf("done 0x%x bytes\n\r", len);

        flush_cache(addr, ei.loadsize);

        return (struct addr_range){addr, ei.memsize};

}

static struct addr_range prep_initrd(struct addr_range vmlinux, void *chosen,

                                     unsigned long initrd_addr,

                                     unsigned long initrd_size)

{

        /* If we have an image attached to us, it overrides anything

         * supplied by the loader. */

        if (_initrd_end > _initrd_start) {

                printf("Attached initrd image at 0x%p-0x%p\n\r",

                       _initrd_start, _initrd_end);

                initrd_addr = (unsigned long)_initrd_start;

                initrd_size = _initrd_end - _initrd_start;

        } else if (initrd_size > 0) {

                printf("Using loader supplied ramdisk at 0x%lx-0x%lx\n\r",

                       initrd_addr, initrd_addr + initrd_size);

        }

        /* If there's no initrd at all, we're done */

        if (! initrd_size)

                return (struct addr_range){0, 0};

        /*

         * If the initrd is too low it will be clobbered when the

         * kernel relocates to its final location.  In this case,

         * allocate a safer place and move it.

         */

        if (initrd_addr < vmlinux.size) {

                void *old_addr = (void *)initrd_addr;

                printf("Allocating 0x%lx bytes for initrd ...\n\r",

                       initrd_size);

                initrd_addr = (unsigned long)malloc(initrd_size);

                if (! initrd_addr)

                        fatal("Can't allocate memory for initial "

                               "ramdisk !\n\r");

                printf("Relocating initrd 0x%lx <- 0x%p (0x%lx bytes)\n\r",

                       initrd_addr, old_addr, initrd_size);

                memmove((void *)initrd_addr, old_addr, initrd_size);

        }

        printf("initrd head: 0x%lx\n\r", *((unsigned long *)initrd_addr));

        /* Tell the kernel initrd address via device tree */

        setprop_val(chosen, "linux,initrd-start", (u32)(initrd_addr));

        setprop_val(chosen, "linux,initrd-end", (u32)(initrd_addr+initrd_size));

        return (struct addr_range){(void *)initrd_addr, initrd_size};

}

/* A buffer that may be edited by tools operating on a zImage binary so as to

 * edit the command line passed to vmlinux (by setting /chosen/bootargs).

 * The buffer is put in it's own section so that tools may locate it easier.

 */

static char cmdline[COMMAND_LINE_SIZE]

        __attribute__((__section__("__builtin_cmdline")));

static void prep_cmdline(void *chosen)

{

        if (cmdline[0] == '\0')

                getprop(chosen, "bootargs", cmdline, COMMAND_LINE_SIZE-1);

        printf("\n\rLinux/PowerPC load: %s", cmdline);

        /* If possible, edit the command line */

        if (console_ops.edit_cmdline)

                console_ops.edit_cmdline(cmdline, COMMAND_LINE_SIZE);

        printf("\n\r");

        /* Put the command line back into the devtree for the kernel */

        setprop_str(chosen, "bootargs", cmdline);

}

struct platform_ops platform_ops;

struct dt_ops dt_ops;

struct console_ops console_ops;

struct loader_info loader_info;

void start(void)

{

        struct addr_range vmlinux, initrd;

        kernel_entry_t kentry;

        unsigned long ft_addr = 0;

        void *chosen;

        /* Do this first, because malloc() could clobber the loader's

         * command line.  Only use the loader command line if a

         * built-in command line wasn't set by an external tool */

        if ((loader_info.cmdline_len > 0) && (cmdline[0] == '\0'))

                memmove(cmdline, loader_info.cmdline,

                        min(loader_info.cmdline_len, COMMAND_LINE_SIZE-1));

        if (console_ops.open && (console_ops.open() < 0))

                exit();

        if (platform_ops.fixups)

                platform_ops.fixups();

        printf("\n\rzImage starting: loaded at 0x%p (sp: 0x%p)\n\r",

               _start, get_sp());

        /* Ensure that the device tree has a /chosen node */

        chosen = finddevice("/chosen");

        if (!chosen)

                chosen = create_node(NULL, "chosen");

        vmlinux = prep_kernel();

        initrd = prep_initrd(vmlinux, chosen,

                             loader_info.initrd_addr, loader_info.initrd_size);

        prep_cmdline(chosen);

        printf("Finalizing device tree...");

        if (dt_ops.finalize)

                ft_addr = dt_ops.finalize();

        if (ft_addr)

                printf(" flat tree at 0x%lx\n\r", ft_addr);

        else

                printf(" using OF tree (promptr=%p)\n\r", loader_info.promptr);

        if (console_ops.close)

                console_ops.close();

        kentry = (kernel_entry_t) vmlinux.addr;

        if (ft_addr)

                kentry(ft_addr, 0, NULL);

        else

                kentry((unsigned long)initrd.addr, initrd.size,

                       loader_info.promptr);

        /* console closed so printf in fatal below may not work */

        fatal("Error: Linux kernel returned to zImage boot wrapper!\n\r");

}