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885 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"
1764 jermar 30
#include <printf.h>
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#include <asm.h>
885 decky 32
 
1764 jermar 33
#define MAX_OFW_ARGS        10
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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 */
1772 jermar 40
    unsigned long nargs;          /**< Number of in arguments */
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    unsigned long nret;           /**< Number of out arguments */
964 decky 42
    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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885 decky 47
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;
885 decky 55
 
1772 jermar 56
static unsigned long ofw_call(const char *service, const int nargs, const int nret, ofw_arg_t *rets, ...)
885 decky 57
{
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    va_list list;
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    ofw_args_t args;
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    int i;
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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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1146 decky 66
    va_start(list, rets);
885 decky 67
    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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1146 decky 76
    for (i = 1; i < nret; i++)
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        rets[i - 1] = args.args[i + nargs];
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956 decky 79
    return args.args[nargs];
885 decky 80
}
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1771 jermar 83
phandle ofw_find_device(const char *name)
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{
1146 decky 85
    return ofw_call("finddevice", 1, 1, NULL, name);
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}
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1771 jermar 89
int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)
964 decky 90
{
1146 decky 91
    return ofw_call("getprop", 4, 1, NULL, device, name, buf, buflen);
964 decky 92
}
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1146 decky 94
 
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static unsigned int ofw_get_address_cells(const phandle device)
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{
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    unsigned int ret;
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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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103
    return ret;
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}
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static unsigned int ofw_get_size_cells(const phandle device)
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{
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    unsigned int ret;
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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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964 decky 119
static ihandle ofw_open(const char *name)
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{
1146 decky 121
    return ofw_call("open", 1, 1, NULL, name);
953 decky 122
}
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void init(void)
885 decky 126
{
964 decky 127
    ofw_chosen = ofw_find_device("/chosen");
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    if (ofw_chosen == -1)
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        halt();
885 decky 130
 
1146 decky 131
    if (ofw_get_property(ofw_chosen, "stdout",  &ofw_stdout, sizeof(ofw_stdout)) <= 0)
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        ofw_stdout = 0;
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1146 decky 134
    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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1146 decky 140
    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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    }
1146 decky 144
 
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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();
149
    }
150
 
151
    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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    }
885 decky 156
}
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964 decky 159
void ofw_write(const char *str, const int len)
885 decky 160
{
964 decky 161
    if (ofw_stdout == 0)
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        return;
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1146 decky 164
    ofw_call("write", 3, 1, NULL, ofw_stdout, str, len);
885 decky 165
}
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void *ofw_translate(const void *virt)
885 decky 169
{
1146 decky 170
    ofw_arg_t result[3];
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172
    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();
175
    }
176
    return (void *) result[2];
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}
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int ofw_map(const void *phys, const void *virt, const int size, const int mode)
181
{
1146 decky 182
    return ofw_call("call-method", 6, 1, NULL, "map", ofw_mmu, mode, size, virt, phys);
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}
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185
 
964 decky 186
int ofw_memmap(memmap_t *map)
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{
1771 jermar 188
    unsigned long buf[BUF_SIZE];
189
    int ret = ofw_get_property(ofw_memory, "reg", buf, sizeof(buf));
1146 decky 190
    if (ret <= 0)
964 decky 191
        return false;
1146 decky 192
 
193
    unsigned int ac = ofw_get_address_cells(ofw_memory);
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    unsigned int sc = ofw_get_size_cells(ofw_memory);
964 decky 195
 
1146 decky 196
    int pos;
964 decky 197
    map->total = 0;
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    map->count = 0;
1771 jermar 199
    for (pos = 0; (pos < ret / sizeof(unsigned long)) && (map->count < MEMMAP_MAX_RECORDS); pos += ac + sc) {
1146 decky 200
        void * start = (void *) buf[pos + ac - 1];
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        unsigned int size = buf[pos + ac + sc - 1];
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203
        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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        }
964 decky 209
    }
210
}
1130 decky 211
 
212
 
213
int ofw_screen(screen_t *screen)
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{
1146 decky 215
    char device_name[BUF_SIZE];
1130 decky 216
 
1771 jermar 217
    if (ofw_get_property(ofw_aliases, "screen", device_name, sizeof(device_name)) <= 0)
1130 decky 218
        return false;
219
 
220
    phandle device = ofw_find_device(device_name);
221
    if (device == -1)
222
        return false;
223
 
224
    if (ofw_get_property(device, "address", &screen->addr, sizeof(screen->addr)) <= 0)
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        return false;
226
 
227
    if (ofw_get_property(device, "width", &screen->width, sizeof(screen->width)) <= 0)
228
        return false;
229
 
230
    if (ofw_get_property(device, "height", &screen->height, sizeof(screen->height)) <= 0)
231
        return false;
232
 
233
    if (ofw_get_property(device, "depth", &screen->bpp, sizeof(screen->bpp)) <= 0)
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        return false;
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236
    if (ofw_get_property(device, "linebytes", &screen->scanline, sizeof(screen->scanline)) <= 0)
237
        return false;
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239
    return true;
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}
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