xen/arch/powerpc/boot_of.c


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/*
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (C) IBM Corp. 2005
 *
 * Authors: Jimi Xenidis <jimix@watson.ibm.com>
 */

#include <xen/config.h>
#include <xen/init.h>
#include <xen/lib.h>
#include <xen/multiboot.h>
#include <xen/compile.h>
#include <xen/spinlock.h>
#include <xen/serial.h>
#include <xen/time.h>
#include <asm/page.h>
#include <asm/io.h>
#include "exceptions.h"
#include "of-devtree.h"

static ulong of_vec;
static ulong of_msr;
static int of_out;
static ofdn_t boot_cpu;
static char bootargs[256];

extern struct ns16550_defaults ns16550;

#undef OF_DEBUG

#ifdef OF_DEBUG
#define DBG(args...) of_printf(args)
#else
#define DBG(args...)
#endif

#define of_panic(MSG...) \
    do { of_printf(MSG); of_printf("\nHANG\n"); for (;;); } while (0)

struct of_service {
    u32 ofs_service;
    u32 ofs_nargs;
    u32 ofs_nrets;
    u32 ofs_args[10];
};

static int bof_chosen;

static struct of_service s;
extern s32 prom_call(void *arg, ulong rtas_base, ulong func, ulong msr);

static int __init of_call(
    const char *service, u32 nargs, u32 nrets, s32 rets[], ...)
{
    int rc;

    if (of_vec != 0) {
        va_list args;
        int i;

        memset(&s, 0, sizeof (s));
        s.ofs_service = (ulong)service;
        s.ofs_nargs = nargs;
        s.ofs_nrets = nrets;
        s.ofs_nargs = nargs;

        /* copy all the params into the args array */
        va_start(args, rets);

        for (i = 0; i < nargs; i++) {
            s.ofs_args[i] = va_arg(args, u32);
        }

        va_end(args);

        rc = prom_call(&s, 0, of_vec, of_msr);

        /* yes always to the copy, just in case */
        for (i = 0; i < nrets; i++) {
            rets[i] = s.ofs_args[i + nargs];
        }
    } else {
        rc = OF_FAILURE;
    }
    return rc;
}

/* popular OF methods */
static int __init _of_write(int ih, const char *addr, u32 len)
{
    int rets[1] = { OF_FAILURE };
    if (of_call("write", 3, 1, rets, ih, addr, len) == OF_FAILURE) {
        return OF_FAILURE;
    }
    return rets[0];