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oflib.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 <stddef.h>
#include "types.h"
#include "elf.h"
#include "string.h"
#include "stdio.h"
#include "page.h"
#include "ops.h"

#include "of.h"

static int (*prom) (void *);

void of_init(void *promptr)
{
      prom = (int (*)(void *))promptr;
}

int of_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;
}

static int of_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;
}

/* 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;
}

/*
 * 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;

static int check_of_version(void)
{
      phandle oprom, chosen;
      char version[64];

      oprom = of_finddevice("/openprom");
      if (oprom == (phandle) -1)
            return 0;
      if (of_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 = of_finddevice("/chosen");
      if (chosen == (phandle) -1) {
            chosen = of_finddevice("/chosen@0");
            if (chosen == (phandle) -1) {
                  printf("no chosen\n");
                  return 0;
            }
      }
      if (of_getprop(chosen, "mmu", &chosen_mmu, sizeof(chosen_mmu)) <= 0) {
            printf("no mmu\n");
            return 0;
      }
      memory = (ihandle) of_call_prom("open", 1, 1, "/memory");
      if (memory == (ihandle) -1) {
            memory = (ihandle) of_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 *of_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 *) of_call_prom("claim", 3, 1, virt, size, align);

      ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", memory,
                         align, size, virt);
      if (ret != 0 || result == -1)
            return (void *) -1;
      ret = of_call_prom_ret("call-method", 5, 2, &result, "claim", chosen_mmu,
                         align, size, virt);
      /* 0x12 == coherent + read/write */
      ret = of_call_prom("call-method", 6, 1, "map", chosen_mmu,
                     0x12, size, virt, virt);
      return (void *) virt;
}

void *of_vmlinux_alloc(unsigned long size)
{
      void *p = malloc(size);

      if (!p)
            fatal("Can't allocate memory for kernel image!\n\r");

      return p;
}

void of_exit(void)
{
      of_call_prom("exit", 0, 0);
}

/*
 * OF device tree routines
 */
void *of_finddevice(const char *name)
{
      return (phandle) of_call_prom("finddevice", 1, 1, name);
}

int of_getprop(const void *phandle, const char *name, void *buf,
             const int buflen)
{
      return of_call_prom("getprop", 4, 1, phandle, name, buf, buflen);
}

int of_setprop(const void *phandle, const char *name, const void *buf,
             const int buflen)
{
      return of_call_prom("setprop", 4, 1, phandle, name, buf, buflen);
}

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