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/*
* 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.
*/
/** @addtogroup genarch
* @{
*/
/** @file
*/
#include <genarch/ofw/ofw.h>
#include <arch/asm.h>
#include <stdarg.h>
#include <cpu.h>
#include <arch/types.h>
uintptr_t ofw_cif; /**< OpenFirmware Client Interface address. */
phandle ofw_chosen;
ihandle ofw_stdout;
ihandle ofw_mmu;
void ofw_init(void)
{
ofw_chosen = ofw_find_device("/chosen");
if (ofw_chosen == -1)
ofw_done();
if (ofw_get_property(ofw_chosen, "stdout", &ofw_stdout, sizeof(ofw_stdout)) <= 0)
ofw_stdout = 0;
if (ofw_get_property(ofw_chosen, "mmu", &ofw_mmu, sizeof(ofw_mmu)) <= 0)
ofw_mmu = 0;
}
void ofw_done(void)
{
(void) ofw_call("exit", 0, 1, NULL);
cpu_halt();
}
/** Perform a call to OpenFirmware client interface.
*
* @param service String identifying the service requested.
* @param nargs Number of input arguments.
* @param nret Number of output arguments. This includes the return value.
* @param rets Buffer for output arguments or NULL. The buffer must accomodate nret - 1 items.
*
* @return Return value returned by the client interface.
*/
ofw_arg_t 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;
va_start(list, rets);
for (i = 0; i < nargs; i++)
args.args[i] = va_arg(list, ofw_arg_t);
va_end(list);
for (i = 0; i < nret; i++)
args.args[i + nargs] = 0;
(void) ofw(&args);
for (i = 1; i < nret; i++)
rets[i - 1] = args.args[i + nargs];
return args.args[nargs];
}
void ofw_putchar(const char ch)
{
if (ofw_stdout == 0)
return;
(void) ofw_call("write", 3, 1, NULL, ofw_stdout, &ch, 1);
}
phandle ofw_find_device(const char *name)
{
return (phandle) ofw_call("finddevice", 1, 1, NULL, name);
}
int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)
{
return (int) ofw_call("getprop", 4, 1, NULL, device, name, buf, buflen);
}
/** Translate virtual address to physical address using OpenFirmware.
*
* Use this function only when OpenFirmware is in charge.
*
* @param virt Virtual address.
* @return NULL on failure or physical address on success.
*/
void *ofw_translate(const void *virt)
{
ofw_arg_t result[4];
int shift;
if (!ofw_mmu)
return NULL;
if (ofw_call("call-method", 3, 5, result, "translate", ofw_mmu, virt) != 0)
return NULL;
if (result[0] != -1)
return NULL;
if (sizeof(unative_t) == 8)
shift = 32;
else
shift = 0;
return (void *) ((result[2]<<shift)|result[3]);
}
void *ofw_claim(const void *addr, const int size, const int align)
{
return (void *) ofw_call("claim", 3, 1, NULL, addr, size, align);
}
/** @}
*/