/*
* Copyright (C) 2005 Martin Decky
* 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.
*/
#include "ofw.h"
#include "asm.h"
#include "printf.h"
#define MAX_OFW_ARGS 10
#define BUF_SIZE 1024
typedef unsigned int ofw_arg_t;
typedef unsigned int ihandle;
typedef unsigned int phandle;
/** OpenFirmware command structure
*
*/
typedef struct {
const char *service; /**< Command name */
unsigned int nargs; /**< Number of in arguments */
unsigned int nret; /**< Number of out arguments */
ofw_arg_t args[MAX_OFW_ARGS]; /**< List of arguments */
} ofw_args_t;
typedef void (*ofw_entry)(ofw_args_t *);
ofw_entry ofw;
phandle ofw_chosen;
ihandle ofw_stdout;
phandle ofw_root;
ihandle ofw_mmu;
phandle ofw_memory;
phandle ofw_aliases;
static int ofw_call(const char *service, const int nargs, const int nret, ofw_arg_t *rets, ...)
{
va_list list;
ofw_args_t args;
int i;
args.service = service;
args.nargs = nargs;
args.nret = nret;
for (i = 0; i < nargs; i++)
args.
args[i
] = va_arg(list
, ofw_arg_t
);
for (i = 0; i < nret; i++)
args.args[i + nargs] = 0;
ofw(&args);
for (i = 1; i < nret; i++)
rets[i - 1] = args.args[i + nargs];
return args.args[nargs];
}
static phandle ofw_find_device(const char *name)
{
return ofw_call("finddevice", 1, 1, NULL, name);
}
static int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)
{
return ofw_call("getprop", 4, 1, NULL, device, name, buf, buflen);
}
static unsigned int ofw_get_address_cells(const phandle device)
{
unsigned int ret;
if (ofw_get_property(device, "#address-cells", &ret, sizeof(ret)) <= 0)
if (ofw_get_property(ofw_root, "#address-cells", &ret, sizeof(ret)) <= 0)
ret = 1;
return ret;
}
static unsigned int ofw_get_size_cells(const phandle device)
{
unsigned int ret;
if (ofw_get_property(device, "#size-cells", &ret, sizeof(ret)) <= 0)
if (ofw_get_property(ofw_root, "#size-cells", &ret, sizeof(ret)) <= 0)
ret = 1;
return ret;
}
static ihandle ofw_open(const char *name)
{
return ofw_call("open", 1, 1, NULL, name);
}
void init(void)
{
ofw_chosen = ofw_find_device("/chosen");
if (ofw_chosen == -1)
halt();
if (ofw_get_property(ofw_chosen, "stdout", &ofw_stdout, sizeof(ofw_stdout)) <= 0)
ofw_stdout = 0;
ofw_root = ofw_find_device("/");
if (ofw_root == -1) {
puts("\r\nError: Unable to find / device, halted.\r\n"); halt();
}
if (ofw_get_property(ofw_chosen, "mmu", &ofw_mmu, sizeof(ofw_mmu)) <= 0) {
puts("\r\nError: Unable to get mmu property, halted.\r\n"); halt();
}
ofw_memory = ofw_find_device("/memory");
if (ofw_memory == -1) {
puts("\r\nError: Unable to find /memory device, halted.\r\n"); halt();
}
ofw_aliases = ofw_find_device("/aliases");
if (ofw_aliases == -1) {
puts("\r\nError: Unable to find /aliases device, halted.\r\n"); halt();
}
}
void ofw_write(const char *str, const int len)
{
if (ofw_stdout == 0)
return;
ofw_call("write", 3, 1, NULL, ofw_stdout, str, len);
}
void *ofw_translate(const void *virt)
{
ofw_arg_t result[3];
if (ofw_call("call-method", 4, 4, result, "translate", ofw_mmu, virt, 1) != 0) {
puts("Error: MMU method translate() failed, halting.\n"); halt();
}
return (void *) result[2];
}
int ofw_map(const void *phys, const void *virt, const int size, const int mode)
{
return ofw_call("call-method", 6, 1, NULL, "map", ofw_mmu, mode, size, virt, phys);
}
int ofw_memmap(memmap_t *map)
{
unsigned int buf[BUF_SIZE];
int ret = ofw_get_property(ofw_memory, "reg", buf, sizeof(unsigned int) * BUF_SIZE);
if (ret <= 0)
return false;
unsigned int ac = ofw_get_address_cells(ofw_memory);
unsigned int sc = ofw_get_size_cells(ofw_memory);
int pos;
map->total = 0;
map->count = 0;
for (pos = 0; (pos < ret / sizeof(unsigned int)) && (map->count < MEMMAP_MAX_RECORDS); pos += ac + sc) {
void * start = (void *) buf[pos + ac - 1];
unsigned int size = buf[pos + ac + sc - 1];
if (size > 0) {
map->zones[map->count].start = start;
map->zones[map->count].size = size;
map->count++;
map->total += size;
}
}
}
int ofw_screen(screen_t *screen)
{
char device_name[BUF_SIZE];
if (ofw_get_property(ofw_aliases, "screen", device_name, sizeof(char) * BUF_SIZE) <= 0)
return false;
phandle device = ofw_find_device(device_name);
if (device == -1)
return false;
if (ofw_get_property(device, "address", &screen->addr, sizeof(screen->addr)) <= 0)
return false;
if (ofw_get_property(device, "width", &screen->width, sizeof(screen->width)) <= 0)
return false;
if (ofw_get_property(device, "height", &screen->height, sizeof(screen->height)) <= 0)
return false;
if (ofw_get_property(device, "depth", &screen->bpp, sizeof(screen->bpp)) <= 0)
return false;
if (ofw_get_property(device, "linebytes", &screen->scanline, sizeof(screen->scanline)) <= 0)
return false;
return true;
}