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1157 decky 1
/*
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 * Copyright (C) 2005 Martin Decky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include "ofw.h"
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#include "asm.h"
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#include "printf.h"
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#define MAX_OFW_ARGS    10
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#define BUF_SIZE        1024
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1166 decky 36
typedef unsigned long ofw_arg_t;
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typedef unsigned long ihandle;
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typedef unsigned long phandle;
1157 decky 39
 
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/** OpenFirmware command structure
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 *
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 */
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typedef struct {
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    const char *service;          /**< Command name */
1166 decky 45
    unsigned long nargs;           /**< Number of in arguments */
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    unsigned long nret;            /**< Number of out arguments */
1157 decky 47
    ofw_arg_t args[MAX_OFW_ARGS]; /**< List of arguments */
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} ofw_args_t;
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typedef void (*ofw_entry)(ofw_args_t *);
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ofw_entry ofw;
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phandle ofw_chosen;
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ihandle ofw_stdout;
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phandle ofw_root;
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ihandle ofw_mmu;
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phandle ofw_memory;
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phandle ofw_aliases;
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1166 decky 63
static long ofw_call(const char *service, const long nargs, const long nret, ofw_arg_t *rets, ...)
1157 decky 64
{
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    va_list list;
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    ofw_args_t args;
1166 decky 67
    long i;
1157 decky 68
 
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    args.service = service;
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    args.nargs = nargs;
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    args.nret = nret;
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    va_start(list, rets);
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    for (i = 0; i < nargs; i++)
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        args.args[i] = va_arg(list, ofw_arg_t);
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    va_end(list);
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    for (i = 0; i < nret; i++)
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        args.args[i + nargs] = 0;
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    ofw(&args);
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    for (i = 1; i < nret; i++)
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        rets[i - 1] = args.args[i + nargs];
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    return args.args[nargs];
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}
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static phandle ofw_find_device(const char *name)
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{
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    return ofw_call("finddevice", 1, 1, NULL, name);
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}
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1166 decky 96
static long ofw_get_property(const phandle device, const char *name, const void *buf, const long buflen)
1157 decky 97
{
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    return ofw_call("getprop", 4, 1, NULL, device, name, buf, buflen);
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}
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1166 decky 102
static unsigned long ofw_get_address_cells(const phandle device)
1157 decky 103
{
1166 decky 104
    unsigned long ret;
1157 decky 105
 
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    if (ofw_get_property(device, "#address-cells", &ret, sizeof(ret)) <= 0)
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        if (ofw_get_property(ofw_root, "#address-cells", &ret, sizeof(ret)) <= 0)
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            ret = 1;
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    return ret;
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}
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1166 decky 114
static unsigned long ofw_get_size_cells(const phandle device)
1157 decky 115
{
1166 decky 116
    unsigned long ret;
1157 decky 117
 
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    if (ofw_get_property(device, "#size-cells", &ret, sizeof(ret)) <= 0)
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        if (ofw_get_property(ofw_root, "#size-cells", &ret, sizeof(ret)) <= 0)
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            ret = 1;
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    return ret;
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}
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static ihandle ofw_open(const char *name)
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{
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    return ofw_call("open", 1, 1, NULL, name);
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}
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void init(void)
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{
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    ofw_chosen = ofw_find_device("/chosen");
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    if (ofw_chosen == -1)
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        halt();
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    if (ofw_get_property(ofw_chosen, "stdout",  &ofw_stdout, sizeof(ofw_stdout)) <= 0)
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        ofw_stdout = 0;
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    ofw_root = ofw_find_device("/");
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    if (ofw_root == -1) {
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        puts("\r\nError: Unable to find / device, halted.\r\n");
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        halt();
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    }
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    if (ofw_get_property(ofw_chosen, "mmu",  &ofw_mmu, sizeof(ofw_mmu)) <= 0) {
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        puts("\r\nError: Unable to get mmu property, halted.\r\n");
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        halt();
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    }
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    ofw_memory = ofw_find_device("/memory");
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    if (ofw_memory == -1) {
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        puts("\r\nError: Unable to find /memory device, halted.\r\n");
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        halt();
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    }
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    ofw_aliases = ofw_find_device("/aliases");
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    if (ofw_aliases == -1) {
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        puts("\r\nError: Unable to find /aliases device, halted.\r\n");
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        halt();
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    }
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}
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1166 decky 166
void ofw_write(const char *str, const long len)
1157 decky 167
{
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    if (ofw_stdout == 0)
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        return;
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    ofw_call("write", 3, 1, NULL, ofw_stdout, str, len);
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}
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void *ofw_translate(const void *virt)
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{
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    ofw_arg_t result[3];
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    if (ofw_call("call-method", 4, 4, result, "translate", ofw_mmu, virt, 1) != 0) {
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        puts("Error: MMU method translate() failed, halting.\n");
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        halt();
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    }
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    return (void *) result[2];
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}
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1166 decky 187
long ofw_map(const void *phys, const void *virt, const long size, const long mode)
1157 decky 188
{
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    return ofw_call("call-method", 6, 1, NULL, "map", ofw_mmu, mode, size, virt, phys);
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}
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1166 decky 193
long ofw_memmap(memmap_t *map)
1157 decky 194
{
1166 decky 195
    unsigned long buf[BUF_SIZE];
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    long ret = ofw_get_property(ofw_memory, "reg", buf, sizeof(unsigned long) * BUF_SIZE);
1157 decky 197
    if (ret <= 0)
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        return false;
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1166 decky 200
    unsigned long ac = ofw_get_address_cells(ofw_memory);
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    unsigned long sc = ofw_get_size_cells(ofw_memory);
1157 decky 202
 
1166 decky 203
    long pos;
1157 decky 204
    map->total = 0;
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    map->count = 0;
1166 decky 206
    for (pos = 0; (pos < ret / sizeof(unsigned long)) && (map->count < MEMMAP_MAX_RECORDS); pos += ac + sc) {
1157 decky 207
        void * start = (void *) buf[pos + ac - 1];
1166 decky 208
        unsigned long size = buf[pos + ac + sc - 1];
1157 decky 209
 
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        if (size > 0) {
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            map->zones[map->count].start = start;
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            map->zones[map->count].size = size;
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            map->count++;
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            map->total += size;
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        }
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    }
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}
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219
 
1166 decky 220
long ofw_screen(screen_t *screen)
1157 decky 221
{
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    char device_name[BUF_SIZE];
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224
    if (ofw_get_property(ofw_aliases, "screen", device_name, sizeof(char) * BUF_SIZE) <= 0)
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        return false;
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227
    phandle device = ofw_find_device(device_name);
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    if (device == -1)
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        return false;
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231
    if (ofw_get_property(device, "address", &screen->addr, sizeof(screen->addr)) <= 0)
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        return false;
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    if (ofw_get_property(device, "width", &screen->width, sizeof(screen->width)) <= 0)
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        return false;
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    if (ofw_get_property(device, "height", &screen->height, sizeof(screen->height)) <= 0)
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        return false;
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    if (ofw_get_property(device, "depth", &screen->bpp, sizeof(screen->bpp)) <= 0)
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        return false;
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243
    if (ofw_get_property(device, "linebytes", &screen->scanline, sizeof(screen->scanline)) <= 0)
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        return false;
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    return true;
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}