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/*
 * Copyright (c) 2005 Martin Decky
 * Copyright (c) 2006 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @file
 * @brief   Architecture dependent parts of OpenFirmware interface.
 */

#include <ofwarch.h>
#include <ofw.h>
#include <printf.h>
#include <string.h>
#include <register.h>
#include "main.h"
#include "asm.h"

/* these tho variables will be set by the detect_subarchitecture function */
extern uint8_t subarchitecture;
extern uint16_t mid_mask;

void write(const char *str, const int len)
{
    int i;
    
    for (i = 0; i < len; i++) {
        if (str[i] == '\n')
            ofw_write("\r", 1);
        ofw_write(&str[i], 1);
    }
}

int ofw_translate_failed(ofw_arg_t flag)
{
    return flag != -1;
}

/**
 * Starts all CPUs represented by following siblings of the given node,
 * except for the current CPU.
 *
 * @param child     The first child of the OFW tree node whose children
 *          represent CPUs to be woken up.
 * @param current_mid   MID of the current CPU, the current CPU will
 *          (of course) not be woken up.
 * @return      Number of CPUs which have the same parent node as
 *          "child".
 */
static int wake_cpus_in_node(phandle child, uint64_t current_mid)
{
    int cpus;
    char type_name[BUF_SIZE];
    
    for (cpus = 0; child != 0 && child != -1;
        child = ofw_get_peer_node(child), cpus++) {
        if (ofw_get_property(child, "device_type", type_name,
            sizeof(type_name)) > 0) {
            if (strcmp(type_name, "cpu") == 0) {
                uint32_t mid;
                
                /*
                 * "upa-portid" for US, "portid" for US-III,
                 * "cpuid" for US-IV
                 */
                if (ofw_get_property(
                    child, "upa-portid",
                    &mid, sizeof(mid)) <= 0
                    && ofw_get_property(child, "portid",
                    &mid, sizeof(mid)) <= 0
                    && ofw_get_property(child, "cpuid",
                    &mid, sizeof(mid)) <= 0)
                    continue;
                    
                if (current_mid != mid) {
                    /*
                     * Start secondary processor.
                     */
                    (void) ofw_call("SUNW,start-cpu", 3, 1,
                        NULL, child, KERNEL_VIRTUAL_ADDRESS,
                        bootinfo.physmem_start |
                        AP_PROCESSOR);
                }
            }
        }
    }

    return cpus;
}

/**
 * Finds out the current CPU's MID and wakes up all AP processors.
 */
int ofw_cpu(void)
{
    int cpus;
    phandle node;
    phandle subnode;
    phandle cpus_parent;
    phandle cmp;
    char name[BUF_SIZE];

    /* get the current CPU MID */
    uint64_t current_mid;
    
    asm volatile ("ldxa [%1] %2, %0\n"
        : "=r" (current_mid)
        : "r" (0), "i" (ASI_ICBUS_CONFIG));
    current_mid >>= ICBUS_CONFIG_MID_SHIFT;

    current_mid &= mid_mask;

    /* wake up CPUs */
    
    cpus_parent = ofw_find_device("/ssm@0,0");
    if (cpus_parent == 0 || cpus_parent == -1) {
        cpus_parent = ofw_find_device("/");
    }

    node = ofw_get_child_node(cpus_parent);
    cpus = wake_cpus_in_node(node, current_mid);
    while (node != 0 && node != -1) {
        if (ofw_get_property(node, "name", name,
            sizeof(name)) > 0) {
            if (strcmp(name, "cmp") == 0) {
                subnode = ofw_get_child_node(node);
                cpus += wake_cpus_in_node(subnode,
                    current_mid);
            }
        }
        node = ofw_get_peer_node(node);
    }
    
    return cpus;
    
}

/** Get physical memory starting address.
 *
 * @param start     Pointer to variable where the physical memory starting
 *          address will be stored.
 *
 * @return      Non-zero on succes, zero on failure.
 */
int ofw_get_physmem_start(uintptr_t *start)
{
    uint32_t memreg[4];

    if (ofw_get_property(ofw_memory, "reg", &memreg, sizeof(memreg)) <= 0)
        return 0;

    *start = (((uint64_t) memreg[0]) << 32) | memreg[1];
    return 1;
}