2007-06-12 22:52:54 -06:00
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/*
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* Copyright (C) Paul Mackerras 1997.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <stddef.h>
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#include "types.h"
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#include "elf.h"
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#include "string.h"
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#include "stdio.h"
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#include "page.h"
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#include "ops.h"
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#include "of.h"
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2014-04-24 01:23:27 -06:00
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typedef u32 prom_arg_t;
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2014-04-24 01:23:26 -06:00
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/* The following structure is used to communicate with open firmware.
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* All arguments in and out are in big endian format. */
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struct prom_args {
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__be32 service; /* Address of service name string. */
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__be32 nargs; /* Number of input arguments. */
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__be32 nret; /* Number of output arguments. */
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__be32 args[10]; /* Input/output arguments. */
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};
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2014-04-24 01:23:36 -06:00
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#ifdef __powerpc64__
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extern int prom(void *);
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#else
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2007-06-12 22:52:54 -06:00
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static int (*prom) (void *);
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2014-04-24 01:23:36 -06:00
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#endif
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2007-06-12 22:52:54 -06:00
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void of_init(void *promptr)
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{
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2014-04-24 01:23:36 -06:00
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#ifndef __powerpc64__
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2007-06-12 22:52:54 -06:00
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prom = (int (*)(void *))promptr;
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2014-04-24 01:23:36 -06:00
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#endif
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2007-06-12 22:52:54 -06:00
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}
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2014-04-24 01:23:26 -06:00
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#define ADDR(x) (u32)(unsigned long)(x)
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2007-06-12 22:52:54 -06:00
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int of_call_prom(const char *service, int nargs, int nret, ...)
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{
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int i;
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2014-04-24 01:23:26 -06:00
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struct prom_args args;
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2007-06-12 22:52:54 -06:00
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va_list list;
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2014-04-24 01:23:28 -06:00
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args.service = cpu_to_be32(ADDR(service));
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args.nargs = cpu_to_be32(nargs);
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args.nret = cpu_to_be32(nret);
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2007-06-12 22:52:54 -06:00
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va_start(list, nret);
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for (i = 0; i < nargs; i++)
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2014-04-24 01:23:28 -06:00
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args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
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2007-06-12 22:52:54 -06:00
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va_end(list);
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for (i = 0; i < nret; i++)
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args.args[nargs+i] = 0;
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if (prom(&args) < 0)
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2014-04-24 01:23:29 -06:00
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return PROM_ERROR;
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2007-06-12 22:52:54 -06:00
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2014-04-24 01:23:28 -06:00
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return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
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2007-06-12 22:52:54 -06:00
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}
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static int of_call_prom_ret(const char *service, int nargs, int nret,
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2014-04-24 01:23:27 -06:00
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prom_arg_t *rets, ...)
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2007-06-12 22:52:54 -06:00
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{
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int i;
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2014-04-24 01:23:26 -06:00
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struct prom_args args;
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2007-06-12 22:52:54 -06:00
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va_list list;
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2014-04-24 01:23:28 -06:00
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args.service = cpu_to_be32(ADDR(service));
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args.nargs = cpu_to_be32(nargs);
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args.nret = cpu_to_be32(nret);
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2007-06-12 22:52:54 -06:00
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va_start(list, rets);
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for (i = 0; i < nargs; i++)
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2014-04-24 01:23:28 -06:00
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args.args[i] = cpu_to_be32(va_arg(list, prom_arg_t));
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2007-06-12 22:52:54 -06:00
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va_end(list);
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for (i = 0; i < nret; i++)
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args.args[nargs+i] = 0;
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if (prom(&args) < 0)
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2014-04-24 01:23:29 -06:00
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return PROM_ERROR;
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2007-06-12 22:52:54 -06:00
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2014-04-24 01:23:29 -06:00
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if (rets != NULL)
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2007-06-12 22:52:54 -06:00
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for (i = 1; i < nret; ++i)
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2014-04-24 01:23:28 -06:00
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rets[i-1] = be32_to_cpu(args.args[nargs+i]);
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2007-06-12 22:52:54 -06:00
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2014-04-24 01:23:28 -06:00
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return (nret > 0) ? be32_to_cpu(args.args[nargs]) : 0;
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2007-06-12 22:52:54 -06:00
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}
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/* returns true if s2 is a prefix of s1 */
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static int string_match(const char *s1, const char *s2)
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{
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for (; *s2; ++s2)
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if (*s1++ != *s2)
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return 0;
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return 1;
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}
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/*
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* Older OF's require that when claiming a specific range of addresses,
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* we claim the physical space in the /memory node and the virtual
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* space in the chosen mmu node, and then do a map operation to
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* map virtual to physical.
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*/
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static int need_map = -1;
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static ihandle chosen_mmu;
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2014-04-24 01:23:31 -06:00
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static ihandle memory;
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2007-06-12 22:52:54 -06:00
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static int check_of_version(void)
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{
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phandle oprom, chosen;
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char version[64];
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2007-06-27 00:54:58 -06:00
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oprom = of_finddevice("/openprom");
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2007-06-12 22:52:54 -06:00
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if (oprom == (phandle) -1)
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return 0;
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2007-06-27 00:54:58 -06:00
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if (of_getprop(oprom, "model", version, sizeof(version)) <= 0)
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2007-06-12 22:52:54 -06:00
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return 0;
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version[sizeof(version)-1] = 0;
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printf("OF version = '%s'\r\n", version);
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if (!string_match(version, "Open Firmware, 1.")
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&& !string_match(version, "FirmWorks,3."))
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return 0;
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2007-06-27 00:54:58 -06:00
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chosen = of_finddevice("/chosen");
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2007-06-12 22:52:54 -06:00
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if (chosen == (phandle) -1) {
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2007-06-27 00:54:58 -06:00
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chosen = of_finddevice("/chosen@0");
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2007-06-12 22:52:54 -06:00
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if (chosen == (phandle) -1) {
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printf("no chosen\n");
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return 0;
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}
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}
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2007-06-27 00:54:58 -06:00
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if (of_getprop(chosen, "mmu", &chosen_mmu, sizeof(chosen_mmu)) <= 0) {
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2007-06-12 22:52:54 -06:00
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printf("no mmu\n");
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return 0;
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}
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2014-04-24 01:23:31 -06:00
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memory = of_call_prom("open", 1, 1, "/memory");
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if (memory == PROM_ERROR) {
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memory = of_call_prom("open", 1, 1, "/memory@0");
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if (memory == PROM_ERROR) {
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2007-06-12 22:52:54 -06:00
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printf("no memory node\n");
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return 0;
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}
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}
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printf("old OF detected\r\n");
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return 1;
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}
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2014-04-24 01:23:30 -06:00
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unsigned int of_claim(unsigned long virt, unsigned long size,
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unsigned long align)
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2007-06-12 22:52:54 -06:00
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{
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int ret;
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2014-04-24 01:23:27 -06:00
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prom_arg_t result;
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2007-06-12 22:52:54 -06:00
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if (need_map < 0)
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need_map = check_of_version();
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if (align || !need_map)
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2014-04-24 01:23:30 -06:00
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return of_call_prom("claim", 3, 1, virt, size, align);
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2007-06-12 22:52:54 -06:00
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ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", memory,
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align, size, virt);
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if (ret != 0 || result == -1)
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2014-04-24 01:23:30 -06:00
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return -1;
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2007-06-12 22:52:54 -06:00
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ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", chosen_mmu,
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align, size, virt);
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/* 0x12 == coherent + read/write */
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ret = of_call_prom("call-method", 6, 1, "map", chosen_mmu,
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0x12, size, virt, virt);
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2014-04-24 01:23:30 -06:00
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return virt;
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2007-06-12 22:52:54 -06:00
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}
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2007-06-27 00:54:58 -06:00
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void *of_vmlinux_alloc(unsigned long size)
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{
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2008-06-23 22:20:29 -06:00
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unsigned long start = (unsigned long)_start, end = (unsigned long)_end;
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2014-04-24 01:23:30 -06:00
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unsigned long addr;
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2008-06-23 22:20:29 -06:00
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void *p;
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/* With some older POWER4 firmware we need to claim the area the kernel
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* will reside in. Newer firmwares don't need this so we just ignore
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* the return value.
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*/
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2014-04-24 01:23:30 -06:00
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addr = (unsigned long) of_claim(start, end - start, 0);
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printf("Trying to claim from 0x%lx to 0x%lx (0x%lx) got %lx\r\n",
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2008-06-23 22:20:29 -06:00
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start, end, end - start, addr);
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p = malloc(size);
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2007-06-27 00:54:58 -06:00
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if (!p)
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fatal("Can't allocate memory for kernel image!\n\r");
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return p;
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}
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2007-06-12 22:52:54 -06:00
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void of_exit(void)
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{
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of_call_prom("exit", 0, 0);
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}
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2007-06-27 00:54:58 -06:00
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/*
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* OF device tree routines
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*/
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void *of_finddevice(const char *name)
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{
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2014-04-24 01:23:32 -06:00
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return (void *) (unsigned long) of_call_prom("finddevice", 1, 1, name);
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2007-06-27 00:54:58 -06:00
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}
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int of_getprop(const void *phandle, const char *name, void *buf,
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const int buflen)
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{
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return of_call_prom("getprop", 4, 1, phandle, name, buf, buflen);
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}
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int of_setprop(const void *phandle, const char *name, const void *buf,
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const int buflen)
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{
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return of_call_prom("setprop", 4, 1, phandle, name, buf, buflen);
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}
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