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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>
1782 jermar 32
#include <types.h>
885 decky 33
 
1783 jermar 34
uintptr_t ofw_cif;
964 decky 35
 
885 decky 36
phandle ofw_chosen;
1146 decky 37
ihandle ofw_stdout;
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phandle ofw_root;
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ihandle ofw_mmu;
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phandle ofw_memory;
1130 decky 41
phandle ofw_aliases;
885 decky 42
 
1772 jermar 43
static unsigned long ofw_call(const char *service, const int nargs, const int nret, ofw_arg_t *rets, ...)
885 decky 44
{
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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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49
    args.service = service;
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    args.nargs = nargs;
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    args.nret = nret;
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1146 decky 53
    va_start(list, rets);
885 decky 54
    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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58
    for (i = 0; i < nret; i++)
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        args.args[i + nargs] = 0;
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1783 jermar 61
    (void) ofw(&args);
62
 
1146 decky 63
    for (i = 1; i < nret; i++)
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        rets[i - 1] = args.args[i + nargs];
1783 jermar 65
 
956 decky 66
    return args.args[nargs];
885 decky 67
}
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69
 
1771 jermar 70
phandle ofw_find_device(const char *name)
953 decky 71
{
1146 decky 72
    return ofw_call("finddevice", 1, 1, NULL, name);
964 decky 73
}
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75
 
1771 jermar 76
int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)
964 decky 77
{
1146 decky 78
    return ofw_call("getprop", 4, 1, NULL, device, name, buf, buflen);
964 decky 79
}
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1146 decky 81
 
82
static unsigned int ofw_get_address_cells(const phandle device)
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{
84
    unsigned int ret;
85
 
86
    if (ofw_get_property(device, "#address-cells", &ret, sizeof(ret)) <= 0)
87
        if (ofw_get_property(ofw_root, "#address-cells", &ret, sizeof(ret)) <= 0)
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            ret = 1;
89
 
90
    return ret;
91
}
92
 
93
 
94
static unsigned int ofw_get_size_cells(const phandle device)
95
{
96
    unsigned int ret;
97
 
98
    if (ofw_get_property(device, "#size-cells", &ret, sizeof(ret)) <= 0)
99
        if (ofw_get_property(ofw_root, "#size-cells", &ret, sizeof(ret)) <= 0)
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            ret = 1;
101
 
102
    return ret;
103
}
104
 
105
 
964 decky 106
static ihandle ofw_open(const char *name)
107
{
1146 decky 108
    return ofw_call("open", 1, 1, NULL, name);
953 decky 109
}
110
 
111
 
964 decky 112
void init(void)
885 decky 113
{
964 decky 114
    ofw_chosen = ofw_find_device("/chosen");
115
    if (ofw_chosen == -1)
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        halt();
885 decky 117
 
1146 decky 118
    if (ofw_get_property(ofw_chosen, "stdout",  &ofw_stdout, sizeof(ofw_stdout)) <= 0)
964 decky 119
        ofw_stdout = 0;
120
 
1146 decky 121
    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");
1130 decky 124
        halt();
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    }
126
 
1146 decky 127
    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");
964 decky 129
        halt();
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    }
1146 decky 131
 
132
    ofw_memory = ofw_find_device("/memory");
133
    if (ofw_memory == -1) {
134
        puts("\r\nError: Unable to find /memory device, halted.\r\n");
135
        halt();
136
    }
137
 
138
    ofw_aliases = ofw_find_device("/aliases");
139
    if (ofw_aliases == -1) {
140
        puts("\r\nError: Unable to find /aliases device, halted.\r\n");
141
        halt();
142
    }
885 decky 143
}
144
 
145
 
964 decky 146
void ofw_write(const char *str, const int len)
885 decky 147
{
964 decky 148
    if (ofw_stdout == 0)
149
        return;
150
 
1146 decky 151
    ofw_call("write", 3, 1, NULL, ofw_stdout, str, len);
885 decky 152
}
153
 
154
 
956 decky 155
void *ofw_translate(const void *virt)
885 decky 156
{
1782 jermar 157
    ofw_arg_t result[4];
158
    int shift;
159
 
160
    if (ofw_call("call-method", 3, 5, result, "translate", ofw_mmu, virt) != 0) {
1146 decky 161
        puts("Error: MMU method translate() failed, halting.\n");
162
        halt();
163
    }
1782 jermar 164
 
1783 jermar 165
    if (ofw_translate_failed(result[0]))
166
        return NULL;
167
 
1782 jermar 168
    if (sizeof(unative_t) == 8)
169
        shift = 32;
170
    else
171
        shift = 0;
172
 
1783 jermar 173
    return (void *) ((result[2]<<shift)|result[3]);
885 decky 174
}
953 decky 175
 
1783 jermar 176
void *ofw_claim(const void *virt, const int len)
177
{
178
    ofw_arg_t retaddr;
179
    int shift;
953 decky 180
 
1783 jermar 181
    if (ofw_call("call-method", 5, 2, &retaddr, "claim", ofw_mmu, 0, len, virt) != 0) {
182
        puts("Error: MMU method claim() failed, halting.\n");
183
        halt();
184
    }
185
 
186
    return (void *) retaddr;
187
}
188
 
1075 decky 189
int ofw_map(const void *phys, const void *virt, const int size, const int mode)
190
{
1782 jermar 191
    uintptr_t phys_hi, phys_lo;
192
 
193
    if (sizeof(unative_t) == 8) {
194
        int shift = 32;
195
        phys_hi = (uintptr_t) phys >> shift;
196
        phys_lo = (uintptr_t) phys & 0xffffffff;
197
    } else {
198
        phys_hi = 0;
199
        phys_lo = (uintptr_t) phys;
200
    }
201
 
202
    return ofw_call("call-method", 7, 1, NULL, "map", ofw_mmu, mode, size, virt,
203
        phys_hi, phys_lo);
1075 decky 204
}
205
 
206
 
964 decky 207
int ofw_memmap(memmap_t *map)
208
{
1771 jermar 209
    unsigned long buf[BUF_SIZE];
210
    int ret = ofw_get_property(ofw_memory, "reg", buf, sizeof(buf));
1146 decky 211
    if (ret <= 0)
964 decky 212
        return false;
1146 decky 213
 
214
    unsigned int ac = ofw_get_address_cells(ofw_memory);
215
    unsigned int sc = ofw_get_size_cells(ofw_memory);
964 decky 216
 
1146 decky 217
    int pos;
964 decky 218
    map->total = 0;
219
    map->count = 0;
1771 jermar 220
    for (pos = 0; (pos < ret / sizeof(unsigned long)) && (map->count < MEMMAP_MAX_RECORDS); pos += ac + sc) {
1146 decky 221
        void * start = (void *) buf[pos + ac - 1];
222
        unsigned int size = buf[pos + ac + sc - 1];
223
 
224
        if (size > 0) {
225
            map->zones[map->count].start = start;
226
            map->zones[map->count].size = size;
227
            map->count++;
228
            map->total += size;
229
        }
964 decky 230
    }
231
}
1130 decky 232
 
233
 
234
int ofw_screen(screen_t *screen)
235
{
1146 decky 236
    char device_name[BUF_SIZE];
1130 decky 237
 
1771 jermar 238
    if (ofw_get_property(ofw_aliases, "screen", device_name, sizeof(device_name)) <= 0)
1130 decky 239
        return false;
240
 
241
    phandle device = ofw_find_device(device_name);
242
    if (device == -1)
243
        return false;
244
 
245
    if (ofw_get_property(device, "address", &screen->addr, sizeof(screen->addr)) <= 0)
246
        return false;
247
 
248
    if (ofw_get_property(device, "width", &screen->width, sizeof(screen->width)) <= 0)
249
        return false;
250
 
251
    if (ofw_get_property(device, "height", &screen->height, sizeof(screen->height)) <= 0)
252
        return false;
253
 
254
    if (ofw_get_property(device, "depth", &screen->bpp, sizeof(screen->bpp)) <= 0)
255
        return false;
256
 
257
    if (ofw_get_property(device, "linebytes", &screen->scanline, sizeof(screen->scanline)) <= 0)
258
        return false;
259
 
260
    return true;
261
}