of.c

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/*
 * Copyright (C) Paul Mackerras 1997.
 *
 * 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 "types.h"
#include "elf.h"
#include "string.h"
#include "stdio.h"
#include "page.h"
#include "ops.h"

#include "of.h"

/* Value picked to match that used by yaboot */
#define PROG_START  0x01400000  /* only used on 64-bit systems */
#define RAM_END     (512<<20)   /* Fixme: use OF */
#define ONE_MB      0x100000



static unsigned long claim_base;

static void *of_try_claim(unsigned long size)
{
    unsigned long addr = 0;

    if (claim_base == 0)
        claim_base = _ALIGN_UP((unsigned long)_end, ONE_MB);

    for(; claim_base < RAM_END; claim_base += ONE_MB) {
#ifdef DEBUG
        printf("    trying: 0x%08lx\n\r", claim_base);
#endif
        addr = (unsigned long)of_claim(claim_base, size, 0);
        if ((void *)addr != (void *)-1)
            break;
    }
    if (addr == 0)
        return NULL;
    claim_base = PAGE_ALIGN(claim_base + size);
    return (void *)addr;
}

static void of_image_hdr(const void *hdr)
{
    const Elf64_Ehdr *elf64 = hdr;

    if (elf64->e_ident[EI_CLASS] == ELFCLASS64) {
        /*
         * Maintain a "magic" minimum address. This keeps some older
         * firmware platforms running.
         */
        if (claim_base < PROG_START)
            claim_base = PROG_START;
    }
}

void platform_init(unsigned long a1, unsigned long a2, void *promptr)
{
    platform_ops.image_hdr = of_image_hdr;
    platform_ops.malloc = of_try_claim;
    platform_ops.exit = of_exit;
    platform_ops.vmlinux_alloc = of_vmlinux_alloc;

    dt_ops.finddevice = of_finddevice;
    dt_ops.getprop = of_getprop;
    dt_ops.setprop = of_setprop;

    of_console_init();

    of_init(promptr);
    loader_info.promptr = promptr;
    if (a1 && a2 && a2 != 0xdeadbeef) {
        loader_info.initrd_addr = a1;
        loader_info.initrd_size = a2;
    }
}