/*      $OpenBSD: openfirm.c,v 1.13 2020/04/02 19:27:51 gkoehler Exp $  */
/*      $NetBSD: openfirm.c,v 1.1 1996/09/30 16:34:52 ws Exp $  */

/*
 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
 * Copyright (C) 1995, 1996 TooLs GmbH.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
 */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/stdarg.h>
#include <machine/cpu.h>
#include <machine/psl.h>

#include <dev/ofw/openfirm.h>
#include "ofw_machdep.h"

extern void ofbcopy(const void *, void *, size_t);

int
OF_peer(int phandle)
{
        static struct {
                char *name;
                int nargs;
                int nreturns;
                int phandle;
                int sibling;
        } args = {
                "peer",
                1,
                1,
        };
        uint32_t s;
        int ret;

        s = ofw_msr();
        args.phandle = phandle;
        if (openfirmware(&args) == -1)
                ret = 0;
        else
                ret = args.sibling;
        ppc_mtmsr(s);
        return ret;
}

int
OF_child(int phandle)
{
        static struct {
                char *name;
                int nargs;
                int nreturns;
                int phandle;
                int child;
        } args = {
                "child",
                1,
                1,
        };
        uint32_t s;
        int ret;

        s = ofw_msr();
        args.phandle = phandle;
        if (openfirmware(&args) == -1)
                ret = 0;
        else
                ret = args.child;
        ppc_mtmsr(s);
        return ret;
}

int
OF_parent(int phandle)
{
        static struct {
                char *name;
                int nargs;
                int nreturns;
                int phandle;
                int parent;
        } args = {
                "parent",
                1,
                1,
        };
        uint32_t s;
        int ret;

        s = ofw_msr();
        args.phandle = phandle;
        if (openfirmware(&args) == -1)
                ret = 0;
        else
                ret = args.parent;
        ppc_mtmsr(s);
        return ret;
}

int
OF_getproplen(int handle, char *prop)
{
        static struct {
                char *name;
                int nargs;
                int nreturns;
                int phandle;
                char *prop;
                int size;
        } args = {
                "getproplen",
                2,
                1,
        };
        uint32_t s;
        int ret;

        s = ofw_msr();
        args.phandle = handle;
        args.prop = prop;
        if (openfirmware(&args) == -1)
                ret = -1;
        else
                ret = args.size;
        ppc_mtmsr(s);
        return ret;
}

int
OF_getprop(int handle, char *prop, void *buf, int buflen)
{
        static struct {
                char *name;
                int nargs;
                int nreturns;
                int phandle;
                char *prop;
                void *buf;
                int buflen;
                int size;
        } args = {
                "getprop",
                4,
                1,
        };
        uint32_t s;
        int ret;

        if (buflen > NBPG)
                return -1;
        s = ofw_msr();
        args.phandle = handle;
        args.prop = prop;
        args.buf = OF_buf;
        args.buflen = buflen;
        if (openfirmware(&args) == -1)
                ret = -1;
        else {
                if (args.size > 0)
                        ofbcopy(OF_buf, buf, args.size);
                ret = args.size;
        }
        ppc_mtmsr(s);
        return ret;
}

int
OF_setprop(int handle, char *prop, const void *buf, int buflen)
{
        static struct {
                char *name;
                int nargs;
                int nreturns;
                int phandle;
                char *prop;
                void *buf;
                int buflen;
                int size;
        } args = {
                "setprop",
                4,
                1,
        };
        uint32_t s;
        int ret;
        
        if (buflen > NBPG)
                return -1;
        s = ofw_msr();
        args.phandle = handle;
        args.prop = prop;
        ofbcopy(buf, OF_buf, buflen);
        args.buf = OF_buf;
        args.buflen = buflen;
        if (openfirmware(&args) == -1)
                ret = -1;
        else
                ret = args.size;
        ppc_mtmsr(s);
        return ret;
}

int
OF_nextprop(int handle, char *prop, void *nextprop)
{
        static struct {
                const char *name;
                int nargs;
                int nreturns;
                int phandle;
                const char *prop;
                char *buf;
                int flag;
        } args = {
                "nextprop",
                3,
                1,
        };
        uint32_t s;
        int ret;

        s = ofw_msr();
        args.phandle = handle;
        args.prop = prop;
        args.buf = OF_buf;
        if (openfirmware(&args) == -1)
                ret = -1;
        else {
                strlcpy(nextprop, OF_buf, 32);
                ret = args.flag;
        }
        ppc_mtmsr(s);
        return ret;
}

int
OF_interpret(char *cmd, int nreturns, ...)
{
        va_list ap;
        static struct {
                char *name;
                int nargs;
                int nreturns;
                char *cmd;
                int status;
                int results[8];
        } args = {
                "interpret",
                1,
                2,
        };
        uint32_t s;
        int i, ret;

        if (nreturns > 8)
                return -1;
        if ((i = strlen(cmd)) >= NBPG)
                return -1;
        s = ofw_msr();
        ofbcopy(cmd, OF_buf, i + 1);
        args.cmd = OF_buf;
        args.nargs = 1;
        args.nreturns = nreturns + 1;
        if (openfirmware(&args) == -1)
                ret = -1;
        else {
                va_start(ap, nreturns);
                for (i = 0; i < nreturns; i++)
                        *va_arg(ap, int *) = args.results[i];
                va_end(ap);
                ret = args.status;
        }
        ppc_mtmsr(s);
        return ret;
}


int
OF_finddevice(char *name)
{
        static struct {
                char *name;
                int nargs;
                int nreturns;
                char *device;
                int phandle;
        } args = {
                "finddevice",
                1,
                1,
        };
        uint32_t s;
        int ret;

        s = ofw_msr();
        args.device = name;
        if (openfirmware(&args) == -1)
                ret = -1;
        else
                ret = args.phandle;
        ppc_mtmsr(s);
        return ret;
}
static void OF_rboot(char *bootspec);

static void
OF_rboot(char *bootspec)
{
        static struct {
                char *name;
                int nargs;
                int nreturns;
        } args = {
                "reset-all",
                0,
                0,
        };
        uint32_t s;
        int l;

        if ((l = strlen(bootspec)) >= NBPG)
                panic("OF_boot");
        s = ofw_msr();
        openfirmware(&args);
        ppc_mtmsr(s);
        /* will attempt exit in OF_boot */
}


void
OF_boot(char *bootspec)
{
        OF_rboot(bootspec);
        printf ("OF_boot returned!");           /* just in case */
        OF_exit();
        while(1);
}

void
OF_exit(void)
{
        static struct {
                char *name;
                int nargs;
                int nreturns;
        } args = {
                "exit",
                0,
                0,
        };

        ofw_msr();
        openfirmware(&args);
        panic ("OF_exit returned!");            /* just in case */
        while (1);
}

void
OF_quiesce(void)
{
        static struct {
                const char *name;
                int nargs;
                int nreturns;
        } args = {
                "quiesce",
                0,
                0,
        };
        uint32_t s;

        s = ofw_msr();
        openfirmware(&args);
        ppc_mtmsr(s);
}

/* XXX What is the reason to have this instead of bcopy/memcpy? */
void
ofbcopy(const void *src, void *dst, size_t len)
{
        const char *sp = src;
        char *dp = dst;

        if (src == dst)
                return;

        while (len-- > 0)
                *dp++ = *sp++;
}

int
OF_getnodebyname(int start, const char *name)
{
        char nname[32];
        int len;
        int node = 0;
        int next;

        if (start == 0)
                start = OF_peer(0);

        for (node = start; node; node = next) {
                len = OF_getprop(node, "name", nname, sizeof(nname));
                nname[len] = 0;
                if (strcmp(nname, name) == 0) {
                        return node;
                }
                if ((next = OF_child(node)) != 0)
                        continue;
                while (node) {
                        if ((next = OF_peer(node)) != 0)
                                break;
                        node = OF_parent(node);
                }
        }
        return node;
}