166 lines
3.7 KiB
C
166 lines
3.7 KiB
C
/*
|
|
* Copyright (C) Paul Mackerras 1997.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
#include <stdarg.h>
|
|
#include <stddef.h>
|
|
#include "string.h"
|
|
#include "stdio.h"
|
|
#include "prom.h"
|
|
|
|
int (*prom)(void *);
|
|
phandle chosen_handle;
|
|
ihandle stdout;
|
|
|
|
int call_prom(const char *service, int nargs, int nret, ...)
|
|
{
|
|
int i;
|
|
struct prom_args {
|
|
const char *service;
|
|
int nargs;
|
|
int nret;
|
|
unsigned int args[12];
|
|
} args;
|
|
va_list list;
|
|
|
|
args.service = service;
|
|
args.nargs = nargs;
|
|
args.nret = nret;
|
|
|
|
va_start(list, nret);
|
|
for (i = 0; i < nargs; i++)
|
|
args.args[i] = va_arg(list, unsigned int);
|
|
va_end(list);
|
|
|
|
for (i = 0; i < nret; i++)
|
|
args.args[nargs+i] = 0;
|
|
|
|
if (prom(&args) < 0)
|
|
return -1;
|
|
|
|
return (nret > 0)? args.args[nargs]: 0;
|
|
}
|
|
|
|
int call_prom_ret(const char *service, int nargs, int nret,
|
|
unsigned int *rets, ...)
|
|
{
|
|
int i;
|
|
struct prom_args {
|
|
const char *service;
|
|
int nargs;
|
|
int nret;
|
|
unsigned int args[12];
|
|
} args;
|
|
va_list list;
|
|
|
|
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, unsigned int);
|
|
va_end(list);
|
|
|
|
for (i = 0; i < nret; i++)
|
|
args.args[nargs+i] = 0;
|
|
|
|
if (prom(&args) < 0)
|
|
return -1;
|
|
|
|
if (rets != (void *) 0)
|
|
for (i = 1; i < nret; ++i)
|
|
rets[i-1] = args.args[nargs+i];
|
|
|
|
return (nret > 0)? args.args[nargs]: 0;
|
|
}
|
|
|
|
int write(void *handle, void *ptr, int nb)
|
|
{
|
|
return call_prom("write", 3, 1, handle, ptr, nb);
|
|
}
|
|
|
|
/*
|
|
* Older OF's require that when claiming a specific range of addresses,
|
|
* we claim the physical space in the /memory node and the virtual
|
|
* space in the chosen mmu node, and then do a map operation to
|
|
* map virtual to physical.
|
|
*/
|
|
static int need_map = -1;
|
|
static ihandle chosen_mmu;
|
|
static phandle memory;
|
|
|
|
/* returns true if s2 is a prefix of s1 */
|
|
static int string_match(const char *s1, const char *s2)
|
|
{
|
|
for (; *s2; ++s2)
|
|
if (*s1++ != *s2)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
static int check_of_version(void)
|
|
{
|
|
phandle oprom, chosen;
|
|
char version[64];
|
|
|
|
oprom = finddevice("/openprom");
|
|
if (oprom == (phandle) -1)
|
|
return 0;
|
|
if (getprop(oprom, "model", version, sizeof(version)) <= 0)
|
|
return 0;
|
|
version[sizeof(version)-1] = 0;
|
|
printf("OF version = '%s'\r\n", version);
|
|
if (!string_match(version, "Open Firmware, 1.")
|
|
&& !string_match(version, "FirmWorks,3."))
|
|
return 0;
|
|
chosen = finddevice("/chosen");
|
|
if (chosen == (phandle) -1) {
|
|
chosen = finddevice("/chosen@0");
|
|
if (chosen == (phandle) -1) {
|
|
printf("no chosen\n");
|
|
return 0;
|
|
}
|
|
}
|
|
if (getprop(chosen, "mmu", &chosen_mmu, sizeof(chosen_mmu)) <= 0) {
|
|
printf("no mmu\n");
|
|
return 0;
|
|
}
|
|
memory = (ihandle) call_prom("open", 1, 1, "/memory");
|
|
if (memory == (ihandle) -1) {
|
|
memory = (ihandle) call_prom("open", 1, 1, "/memory@0");
|
|
if (memory == (ihandle) -1) {
|
|
printf("no memory node\n");
|
|
return 0;
|
|
}
|
|
}
|
|
printf("old OF detected\r\n");
|
|
return 1;
|
|
}
|
|
|
|
void *claim(unsigned long virt, unsigned long size, unsigned long align)
|
|
{
|
|
int ret;
|
|
unsigned int result;
|
|
|
|
if (need_map < 0)
|
|
need_map = check_of_version();
|
|
if (align || !need_map)
|
|
return (void *) call_prom("claim", 3, 1, virt, size, align);
|
|
|
|
ret = call_prom_ret("call-method", 5, 2, &result, "claim", memory,
|
|
align, size, virt);
|
|
if (ret != 0 || result == -1)
|
|
return (void *) -1;
|
|
ret = call_prom_ret("call-method", 5, 2, &result, "claim", chosen_mmu,
|
|
align, size, virt);
|
|
/* 0x12 == coherent + read/write */
|
|
ret = call_prom("call-method", 6, 1, "map", chosen_mmu,
|
|
0x12, size, virt, virt);
|
|
return (void *) virt;
|
|
}
|