second/prom.c - yaboot - Rivoreo Source Code Repositories

 /*
  *  prom.c - Routines for talking to the Open Firmware PROM
  *
  *  Copyright (C) 2001, 2002 Ethan Benson
  *
  *  Copyright (C) 1999 Benjamin Herrenschmidt
  *
  *  Copyright (C) 1999 Marius Vollmer
  *
  *  Copyright (C) 1996 Paul Mackerras.
  *
  *  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.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  */

 #include "prom.h"
 #include "stdarg.h"
 #include "stddef.h"
 #include "stdlib.h"
 #include "types.h"
 #include "ctype.h"
 #include "asm/processor.h"
 #include "errors.h"
 #include "debug.h"

 #define READ_BLOCKS_USE_READ	1

 prom_entry prom;

 ihandle prom_stdin, prom_stdout;

 //extern int vsprintf(char *buf, const char *fmt, va_list args);

 static ihandle prom_mem, prom_mmu;
 static ihandle prom_chosen, prom_options;

 struct prom_args {
      const char *service;
      int nargs;
      int nret;
      void *args[10];
 };

 void *
 call_prom (const char *service, int nargs, int nret, ...)
 {
      va_list list;
      int i;
      struct prom_args prom_args;

      prom_args.service = service;
      prom_args.nargs = nargs;
      prom_args.nret = nret;
      va_start (list, nret);
      for (i = 0; i < nargs; ++i)
 	  prom_args.args[i] = va_arg(list, void *);
      va_end(list);
      for (i = 0; i < nret; ++i)
 	  prom_args.args[i + nargs] = 0;
      prom (&prom_args);
      if (nret > 0)
 	  return prom_args.args[nargs];
      else
 	  return 0;
 }

 void *
 call_prom_return (const char *service, int nargs, int nret, ...)
 {
      va_list list;
      int i;
      void* result;
      struct prom_args prom_args;

      prom_args.service = service;
      prom_args.nargs = nargs;
      prom_args.nret = nret;
      va_start (list, nret);
      for (i = 0; i < nargs; ++i)
 	  prom_args.args[i] = va_arg(list, void *);
      for (i = 0; i < nret; ++i)
 	  prom_args.args[i + nargs] = 0;
      if (prom (&prom_args) != 0)
 	  return PROM_INVALID_HANDLE;
      if (nret > 0) {
 	  result = prom_args.args[nargs];
 	  for (i=1; i<nret; i++) {
 	       void** rp = va_arg(list, void**);
 	       *rp = prom_args.args[i+nargs];
 	  }
      } else
 	  result = 0;
      va_end(list);
      return result;
 }

 static void *
 call_method_1 (char *method, prom_handle h, int nargs, ...)
 {
      va_list list;
      int i;
      struct prom_args prom_args;

      prom_args.service = "call-method";
      prom_args.nargs = nargs+2;
      prom_args.nret = 2;
      prom_args.args[0] = method;
      prom_args.args[1] = h;
      va_start (list, nargs);
      for (i = 0; i < nargs; ++i)
 	  prom_args.args[2+i] = va_arg(list, void *);
      va_end(list);
      prom_args.args[2+nargs] = 0;
      prom_args.args[2+nargs+1] = 0;

      prom (&prom_args);

      if (prom_args.args[2+nargs] != 0)
      {
 	  prom_printf ("method '%s' failed %p\n", method, prom_args.args[2+nargs]);
 	  return 0;
      }
      return prom_args.args[2+nargs+1];
 }


 prom_handle
 prom_finddevice (char *name)
 {
      return call_prom ("finddevice", 1, 1, name);
 }

 prom_handle
 prom_findpackage(char *path)
 {
      return call_prom ("find-package", 1, 1, path);
 }

 int
 prom_getprop (prom_handle pack, char *name, void *mem, int len)
 {
      return (int)call_prom ("getprop", 4, 1, pack, name, mem, len);
 }

 int
 prom_getproplen(prom_handle pack, const char *name)
 {
      return (int)call_prom("getproplen", 2, 1, pack, name);
 }

 int
 prom_setprop (prom_handle pack, char *name, void *mem, int len)
 {
      return (int)call_prom ("setprop", 4, 1, pack, name, mem, len);
 }

 int
 prom_get_chosen (char *name, void *mem, int len)
 {
      return prom_getprop (prom_chosen, name, mem, len);
 }

 int
 prom_get_options (char *name, void *mem, int len)
 {
      if (prom_options == (void *)-1)
 	  return -1;
      return prom_getprop (prom_options, name, mem, len);
 }

 int
 prom_set_options (char *name, void *mem, int len)
 {
      if (prom_options == (void *)-1)
 	  return -1;
      return prom_setprop (prom_options, name, mem, len);
 }

 int
 prom_get_devtype (char *device)
 {
      phandle    dev;
      int        result;
      char       tmp[64];

      if (strstr(device, TOK_ISCSI))
 	  device = strcpy(tmp, "/vdevice/gscsi/disk");

      /* Find OF device phandle */
      dev = prom_finddevice(device);
      if (dev == PROM_INVALID_HANDLE) {
 	  return FILE_ERR_BADDEV;
      }

      /* Check the kind of device */
      result = prom_getprop(dev, "device_type", tmp, 63);
      if (result == -1) {
 	  prom_printf("can't get <device_type> for device: %s\n", device);
 	  return FILE_ERR_BADDEV;
      }
      tmp[result] = 0;
      if (!strcmp(tmp, "block"))
 	  return FILE_DEVICE_BLOCK;
      else if (!strcmp(tmp, "network"))
 	  return FILE_DEVICE_NET;
      else {
 	  prom_printf("Unkown device type <%s>\n", tmp);
 	  return FILE_ERR_BADDEV;
      }
 }

 void
 prom_init (prom_entry pp)
 {
      prom = pp;

      prom_chosen = prom_finddevice ("/chosen");
      if (prom_chosen == (void *)-1)
 	  prom_exit ();
      prom_options = prom_finddevice ("/options");
      if (prom_get_chosen ("stdout", &prom_stdout, sizeof(prom_stdout)) <= 0)
 	  prom_exit();
      if (prom_get_chosen ("stdin", &prom_stdin, sizeof(prom_stdin)) <= 0)
 	  prom_abort ("\nCan't open stdin");
      if (prom_get_chosen ("memory", &prom_mem, sizeof(prom_mem)) <= 0)
 	  prom_abort ("\nCan't get mem handle");
      if (prom_get_chosen ("mmu", &prom_mmu, sizeof(prom_mmu)) <= 0)
 	  prom_abort ("\nCan't get mmu handle");

   // move cursor to fresh line
      prom_printf ("\n");

      /* Add a few OF methods (thanks Darwin) */
 #if DEBUG
      prom_printf ("Adding OF methods...\n");
 #endif

      prom_interpret (
 	  /* All values in this forth code are in hex */
 	  "hex "
 	  /* Those are a few utilities ripped from Apple */
 	  ": D2NIP decode-int nip nip ;\r"	// A useful function to save space
 	  ": GPP$ get-package-property 0= ;\r"	// Another useful function to save space
 	  ": ^on0 0= if -1 throw then ;\r"	// Bail if result zero
 	  ": $CM $call-method ;\r"
 	  );

      /* Some forth words used by the release method */
      prom_interpret (
 	  " \" /chosen\" find-package if "
 		 "dup \" memory\" rot GPP$ if "
 			 "D2NIP swap "				 // ( MEMORY-ihandle "/chosen"-phandle )
 			 "\" mmu\" rot GPP$ if "
 				 "D2NIP "				 // ( MEMORY-ihandle MMU-ihandle )
 			 "else "
 				 "0 "					 // ( MEMORY-ihandle 0 )
 			 "then "
 		 "else "
 			 "0 0 "						 // ( 0 0 )
 		 "then "
 	  "else "
 		 "0 0 "							 // ( 0 0 )
 	  "then\r"
 	  "value mmu# "
 	  "value mem# "
 	  );

      prom_interpret (
 	  ": ^mem mem# $CM ; "
 	  ": ^mmu mmu# $CM ; "
 	  );

      DEBUG_F("OF interface initialized.\n");
 }

 prom_handle
 prom_open (char *spec)
 {
      return call_prom ("open", 1, 1, spec, strlen(spec));
 }

 void
 prom_close (prom_handle file)
 {
      call_prom ("close", 1, 0, file);
 }

 int
 prom_read (prom_handle file, void *buf, int n)
 {
      int result = 0;
      int retries = 10;

      if (n == 0)
 	  return 0;
      while(--retries) {
 	  result = (int)call_prom ("read", 3, 1, file, buf, n);
 	  if (result != 0)
 	       break;
 	  call_prom("interpret", 1, 1, " 10 ms");
      }

      return result;
 }

 int
 prom_write (prom_handle file, void *buf, int n)
 {
      return (int)call_prom ("write", 3, 1, file, buf, n);
 }

 int
 prom_seek (prom_handle file, int pos)
 {
      int status = (int)call_prom ("seek", 3, 1, file, 0, pos);
      return status == 0 || status == 1;
 }

 int
 prom_lseek (prom_handle file, unsigned long long pos)
 {
      int status = (int)call_prom ("seek", 3, 1, file,
 				  (unsigned int)(pos >> 32), (unsigned int)(pos & 0xffffffffUL));
      return status == 0 || status == 1;
 }

 int
 prom_loadmethod (prom_handle device, void* addr)
 {
      return (int)call_method_1 ("load", device, 1, addr);
 }

 int
 prom_getblksize (prom_handle file)
 {
      return (int)call_method_1 ("block-size", file, 0);
 }

 int
 prom_readblocks (prom_handle dev, int blockNum, int blockCount, void *buffer)
 {
 #if READ_BLOCKS_USE_READ
      int status;
      unsigned int blksize;

      blksize = prom_getblksize(dev);
      if (blksize <= 1)
 	  blksize = 512;
      status = prom_seek(dev, blockNum * blksize);
      if (status != 1) {
 	  return 0;
 	  prom_printf("Can't seek to 0x%x\n", blockNum * blksize);
      }

      status = prom_read(dev, buffer, blockCount * blksize);
 //  prom_printf("prom_readblocks, bl: %d, cnt: %d, status: %d\n",
 //  	blockNum, blockCount, status);

      return status == (blockCount * blksize);
 #else
      int result;
      int retries = 10;

      if (blockCount == 0)
 	  return blockCount;
      while(--retries) {
 	  result = call_method_1 ("read-blocks", dev, 3, buffer, blockNum, blockCount);
 	  if (result != 0)
 	       break;
 	  call_prom("interpret", 1, 1, " 10 ms");
      }

      return result;
 #endif
 }

 int
 prom_getchar ()
 {
      char c[4];
      int a;

      while ((a = (int)call_prom ("read", 3, 1, prom_stdin, c, 4)) == 0)
 	  ;
      if (a == -1)
 	  prom_abort ("EOF on console\n");
      if (a == 3 && c[0] == '\e' && c[1] == '[')
 	  return 0x100 | c[2];
      return c[0];
 }

 int
 prom_nbgetchar()
 {
      char ch;

      return (int) call_prom("read", 3, 1, prom_stdin, &ch, 1) > 0? ch: -1;
 }

 void
 prom_putchar (char c)
 {
      if (c == '\n')
 	  call_prom ("write", 3, 1, prom_stdout, "\r\n", 2);
      else
 	  call_prom ("write", 3, 1, prom_stdout, &c, 1);
 }

 void
 prom_puts (prom_handle file, char *s)
 {
      const char *p, *q;

      for (p = s; *p != 0; p = q)
      {
 	  for (q = p; *q != 0 && *q != '\n'; ++q)
 	       ;
 	  if (q > p)
 	       call_prom ("write", 3, 1, file, p, q - p);
 	  if (*q != 0)
 	  {
 	       ++q;
 	       call_prom ("write", 3, 1, file, "\r\n", 2);
 	  }
      }
 }

 void
 prom_vfprintf (prom_handle file, char *fmt, va_list ap)
 {
      static char printf_buf[2048];
      vsprintf (printf_buf, fmt, ap);
      prom_puts (file, printf_buf);
 }

 void
 prom_vprintf (char *fmt, va_list ap)
 {
      static char printf_buf[2048];
      vsprintf (printf_buf, fmt, ap);
      prom_puts (prom_stdout, printf_buf);
 }

 void
 prom_fprintf (prom_handle file, char *fmt, ...)
 {
      va_list ap;
      va_start (ap, fmt);
      prom_vfprintf (file, fmt, ap);
      va_end (ap);
 }

 void
 prom_printf (char *fmt, ...)
 {
      va_list ap;
      va_start (ap, fmt);
      prom_vfprintf (prom_stdout, fmt, ap);
      va_end (ap);
 }

 void
 prom_perror (int error, char *filename)
 {
      if (error == FILE_ERR_EOF)
 	  prom_printf("%s: Unexpected End Of File\n", filename);
      else if (error == FILE_ERR_NOTFOUND)
 	  prom_printf("%s: No such file or directory\n", filename);
      else if (error == FILE_CANT_SEEK)
 	  prom_printf("%s: Seek error\n", filename);
      else if (error == FILE_IOERR)
 	  prom_printf("%s: Input/output error\n", filename);
      else if (error == FILE_BAD_PATH)
 	  prom_printf("%s: Path too long\n", filename);
      else if (error == FILE_ERR_BAD_TYPE)
 	  prom_printf("%s: Not a regular file\n", filename);
      else if (error == FILE_ERR_NOTDIR)
 	  prom_printf("%s: Not a directory\n", filename);
      else if (error == FILE_ERR_BAD_FSYS)
 	  prom_printf("%s: Unknown or corrupt filesystem\n", filename);
      else if (error == FILE_ERR_SYMLINK_LOOP)
 	  prom_printf("%s: Too many levels of symbolic links\n", filename);
      else if (error == FILE_ERR_LENGTH)
 	  prom_printf("%s: File too large\n", filename);
      else if (error == FILE_ERR_FSBUSY)
 	  prom_printf("%s: Filesystem busy\n", filename);
      else if (error == FILE_ERR_BADDEV)
 	  prom_printf("%s: Unable to open file, Invalid device\n", filename);
      else
 	  prom_printf("%s: Unknown error\n", filename);
 }

 void
 prom_readline (char *prompt, char *buf, int len)
 {
      int i = 0;
      int c;

      if (prompt)
 	  prom_puts (prom_stdout, prompt);

      while (i < len-1 && (c = prom_getchar ()) != '\r')
      {
 	  if (c >= 0x100)
 	       continue;
 	  if (c == 8)
 	  {
 	       if (i > 0)
 	       {
 		    prom_puts (prom_stdout, "\b \b");
 		    i--;
 	       }
 	       else
 		    prom_putchar ('\a');
 	  }
 	  else if (isprint (c))
 	  {
 	       prom_putchar (c);
 	       buf[i++] = c;
 	  }
 	  else
 	       prom_putchar ('\a');
      }
      prom_putchar ('\n');
      buf[i] = 0;
 }

 #ifdef CONFIG_SET_COLORMAP
 int prom_set_color(prom_handle device, int color, int r, int g, int b)
 {
      return (int)call_prom( "call-method", 6, 1, "color!", device, color, b, g, r );
 }
 #endif /* CONFIG_SET_COLORMAP */

 void
 prom_exit ()
 {
      call_prom ("exit", 0, 0);
 }

 void
 prom_abort (char *fmt, ...)
 {
      va_list ap;
      va_start (ap, fmt);
      prom_vfprintf (prom_stdout, fmt, ap);
      va_end (ap);
      prom_exit ();
 }

 void
 prom_sleep (int seconds)
 {
      int end;
      end = (prom_getms() + (seconds * 1000));
      while (prom_getms() <= end);
 }

 void *
 prom_claim (void *virt, unsigned int size, unsigned int align)
 {
      return call_prom ("claim", 3, 1, virt, size, align);
 }

 void
 prom_release(void *virt, unsigned int size)
 {
      call_prom ("release", 2, 0, virt, size);
 #if 0 /* this is bullshit, newworld OF RELEASE method works fine. */

      /* release in not enough, it needs also an unmap call. This bit of forth
       * code inspired from Darwin's bootloader but could be replaced by direct
       * calls to the MMU package if needed
       */
      call_prom ("interpret", 3, 1,
 #if DEBUG
 		".\" ReleaseMem:\" 2dup . . cr "
 #endif
 		"over \" translate\" ^mmu "		// Find out physical base
 		"^on0 "					// Bail if translation failed
 		"drop "					// Leaving phys on top of stack
 		"2dup \" unmap\" ^mmu "			// Unmap the space first
 		"2dup \" release\" ^mmu "		// Then free the virtual pages
 		"\" release\" ^mem "			// Then free the physical pages
 		,size, virt
 	  );
 #endif /* bullshit */
 }

 void
 prom_map (void *phys, void *virt, int size)
 {
      unsigned long msr = mfmsr();

      /* Only create a mapping if we're running with relocation enabled. */
      if ( (msr & MSR_IR) && (msr & MSR_DR) )
 	  call_method_1 ("map", prom_mmu, 4, -1, size, virt, phys);
 }

 void
 prom_unmap (void *phys, void *virt, int size)
 {
      unsigned long msr = mfmsr();

      /* Only unmap if we're running with relocation enabled. */
      if ( (msr & MSR_IR) && (msr & MSR_DR) )
 	  call_method_1 ("map", prom_mmu, 4, -1, size, virt, phys);
 }

 char *
 prom_getargs ()
 {
      static char args[256];
      int l;

      l = prom_get_chosen ("bootargs", args, 255);
      args[l] = '\0';
      return args;
 }

 void
 prom_setargs (char *args)
 {
      int l = strlen (args)+1;
      if ((int)call_prom ("setprop", 4, 1, prom_chosen, "bootargs", args, l) != l)
 	  prom_printf ("can't set args\n");
 }

 int prom_interpret (char *forth)
 {
      return (int)call_prom("interpret", 1, 1, forth);
 }

 int
 prom_getms(void)
 {
      return (int) call_prom("milliseconds", 0, 1);
 }

 void
 prom_pause(void)
 {
      call_prom("enter", 0, 0);
 }

 /*
  * Local variables:
  * c-file-style: "k&r"
  * c-basic-offset: 5
  * End:
  */
	/*
	* prom.c - Routines for talking to the Open Firmware PROM
	*
	* Copyright (C) 2001, 2002 Ethan Benson
	*
	* Copyright (C) 1999 Benjamin Herrenschmidt
	*
	* Copyright (C) 1999 Marius Vollmer
	*
	* Copyright (C) 1996 Paul Mackerras.
	*
	* 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.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	*/

	#include "prom.h"
	#include "stdarg.h"
	#include "stddef.h"
	#include "stdlib.h"
	#include "types.h"
	#include "ctype.h"
	#include "asm/processor.h"
	#include "errors.h"
	#include "debug.h"

	#define READ_BLOCKS_USE_READ 1

	prom_entry prom;

	ihandle prom_stdin, prom_stdout;

	//extern int vsprintf(char buf, const char fmt, va_list args);

	static ihandle prom_mem, prom_mmu;
	static ihandle prom_chosen, prom_options;

	struct prom_args {
	const char *service;
	int nargs;
	int nret;
	void *args[10];
	};

	void *
	call_prom (const char *service, int nargs, int nret, ...)
	{
	va_list list;
	int i;
	struct prom_args prom_args;

	prom_args.service = service;
	prom_args.nargs = nargs;
	prom_args.nret = nret;
	va_start (list, nret);
	for (i = 0; i < nargs; ++i)
	prom_args.args[i] = va_arg(list, void *);
	va_end(list);
	for (i = 0; i < nret; ++i)
	prom_args.args[i + nargs] = 0;
	prom (&prom_args);
	if (nret > 0)
	return prom_args.args[nargs];
	else
	return 0;
	}

	void *
	call_prom_return (const char *service, int nargs, int nret, ...)
	{
	va_list list;
	int i;
	void* result;
	struct prom_args prom_args;

	prom_args.service = service;
	prom_args.nargs = nargs;
	prom_args.nret = nret;
	va_start (list, nret);
	for (i = 0; i < nargs; ++i)
	prom_args.args[i] = va_arg(list, void *);
	for (i = 0; i < nret; ++i)
	prom_args.args[i + nargs] = 0;
	if (prom (&prom_args) != 0)
	return PROM_INVALID_HANDLE;
	if (nret > 0) {
	result = prom_args.args[nargs];
	for (i=1; i<nret; i++) {
	void rp = va_arg(list, void);
	*rp = prom_args.args[i+nargs];
	}
	} else
	result = 0;
	va_end(list);
	return result;
	}

	static void *
	call_method_1 (char *method, prom_handle h, int nargs, ...)
	{
	va_list list;
	int i;
	struct prom_args prom_args;

	prom_args.service = "call-method";
	prom_args.nargs = nargs+2;
	prom_args.nret = 2;
	prom_args.args[0] = method;
	prom_args.args[1] = h;
	va_start (list, nargs);
	for (i = 0; i < nargs; ++i)
	prom_args.args[2+i] = va_arg(list, void *);
	va_end(list);
	prom_args.args[2+nargs] = 0;
	prom_args.args[2+nargs+1] = 0;

	prom (&prom_args);

	if (prom_args.args[2+nargs] != 0)
	{
	prom_printf ("method '%s' failed %p\n", method, prom_args.args[2+nargs]);
	return 0;
	}
	return prom_args.args[2+nargs+1];
	}


	prom_handle
	prom_finddevice (char *name)
	{
	return call_prom ("finddevice", 1, 1, name);
	}

	prom_handle
	prom_findpackage(char *path)
	{
	return call_prom ("find-package", 1, 1, path);
	}

	int
	prom_getprop (prom_handle pack, char name, void mem, int len)
	{
	return (int)call_prom ("getprop", 4, 1, pack, name, mem, len);
	}

	int
	prom_getproplen(prom_handle pack, const char *name)
	{
	return (int)call_prom("getproplen", 2, 1, pack, name);
	}

	int
	prom_setprop (prom_handle pack, char name, void mem, int len)
	{
	return (int)call_prom ("setprop", 4, 1, pack, name, mem, len);
	}

	int
	prom_get_chosen (char name, void mem, int len)
	{
	return prom_getprop (prom_chosen, name, mem, len);
	}

	int
	prom_get_options (char name, void mem, int len)
	{
	if (prom_options == (void *)-1)
	return -1;
	return prom_getprop (prom_options, name, mem, len);
	}

	int
	prom_set_options (char name, void mem, int len)
	{
	if (prom_options == (void *)-1)
	return -1;
	return prom_setprop (prom_options, name, mem, len);
	}

	int
	prom_get_devtype (char *device)
	{
	phandle dev;
	int result;
	char tmp[64];

	if (strstr(device, TOK_ISCSI))
	device = strcpy(tmp, "/vdevice/gscsi/disk");

	/* Find OF device phandle */
	dev = prom_finddevice(device);
	if (dev == PROM_INVALID_HANDLE) {
	return FILE_ERR_BADDEV;
	}

	/* Check the kind of device */
	result = prom_getprop(dev, "device_type", tmp, 63);
	if (result == -1) {
	prom_printf("can't get <device_type> for device: %s\n", device);
	return FILE_ERR_BADDEV;
	}
	tmp[result] = 0;
	if (!strcmp(tmp, "block"))
	return FILE_DEVICE_BLOCK;
	else if (!strcmp(tmp, "network"))
	return FILE_DEVICE_NET;
	else {
	prom_printf("Unkown device type <%s>\n", tmp);
	return FILE_ERR_BADDEV;
	}
	}

	void
	prom_init (prom_entry pp)
	{
	prom = pp;

	prom_chosen = prom_finddevice ("/chosen");
	if (prom_chosen == (void *)-1)
	prom_exit ();
	prom_options = prom_finddevice ("/options");
	if (prom_get_chosen ("stdout", &prom_stdout, sizeof(prom_stdout)) <= 0)
	prom_exit();
	if (prom_get_chosen ("stdin", &prom_stdin, sizeof(prom_stdin)) <= 0)
	prom_abort ("\nCan't open stdin");
	if (prom_get_chosen ("memory", &prom_mem, sizeof(prom_mem)) <= 0)
	prom_abort ("\nCan't get mem handle");
	if (prom_get_chosen ("mmu", &prom_mmu, sizeof(prom_mmu)) <= 0)
	prom_abort ("\nCan't get mmu handle");

	// move cursor to fresh line
	prom_printf ("\n");

	/* Add a few OF methods (thanks Darwin) */
	#if DEBUG
	prom_printf ("Adding OF methods...\n");
	#endif

	prom_interpret (
	/* All values in this forth code are in hex */
	"hex "
	/* Those are a few utilities ripped from Apple */
	": D2NIP decode-int nip nip ;\r" // A useful function to save space
	": GPP$ get-package-property 0= ;\r" // Another useful function to save space
	": ^on0 0= if -1 throw then ;\r" // Bail if result zero
	": $CM $call-method ;\r"
	);

	/* Some forth words used by the release method */
	prom_interpret (
	" \" /chosen\" find-package if "
	"dup \" memory\" rot GPP$ if "
	"D2NIP swap " // ( MEMORY-ihandle "/chosen"-phandle )
	"\" mmu\" rot GPP$ if "
	"D2NIP " // ( MEMORY-ihandle MMU-ihandle )
	"else "
	"0 " // ( MEMORY-ihandle 0 )
	"then "
	"else "
	"0 0 " // ( 0 0 )
	"then "
	"else "
	"0 0 " // ( 0 0 )
	"then\r"
	"value mmu# "
	"value mem# "
	);

	prom_interpret (
	": ^mem mem# $CM ; "
	": ^mmu mmu# $CM ; "
	);

	DEBUG_F("OF interface initialized.\n");
	}

	prom_handle
	prom_open (char *spec)
	{
	return call_prom ("open", 1, 1, spec, strlen(spec));
	}

	void
	prom_close (prom_handle file)
	{
	call_prom ("close", 1, 0, file);
	}

	int
	prom_read (prom_handle file, void *buf, int n)
	{
	int result = 0;
	int retries = 10;

	if (n == 0)
	return 0;
	while(--retries) {
	result = (int)call_prom ("read", 3, 1, file, buf, n);
	if (result != 0)
	break;
	call_prom("interpret", 1, 1, " 10 ms");
	}

	return result;
	}

	int
	prom_write (prom_handle file, void *buf, int n)
	{
	return (int)call_prom ("write", 3, 1, file, buf, n);
	}

	int
	prom_seek (prom_handle file, int pos)
	{
	int status = (int)call_prom ("seek", 3, 1, file, 0, pos);
	return status == 0 \|\| status == 1;
	}

	int
	prom_lseek (prom_handle file, unsigned long long pos)
	{
	int status = (int)call_prom ("seek", 3, 1, file,
	(unsigned int)(pos >> 32), (unsigned int)(pos & 0xffffffffUL));
	return status == 0 \|\| status == 1;
	}

	int
	prom_loadmethod (prom_handle device, void* addr)
	{
	return (int)call_method_1 ("load", device, 1, addr);
	}

	int
	prom_getblksize (prom_handle file)
	{
	return (int)call_method_1 ("block-size", file, 0);
	}

	int
	prom_readblocks (prom_handle dev, int blockNum, int blockCount, void *buffer)
	{
	#if READ_BLOCKS_USE_READ
	int status;
	unsigned int blksize;

	blksize = prom_getblksize(dev);
	if (blksize <= 1)
	blksize = 512;
	status = prom_seek(dev, blockNum * blksize);
	if (status != 1) {
	return 0;
	prom_printf("Can't seek to 0x%x\n", blockNum * blksize);
	}

	status = prom_read(dev, buffer, blockCount * blksize);
	// prom_printf("prom_readblocks, bl: %d, cnt: %d, status: %d\n",
	// blockNum, blockCount, status);

	return status == (blockCount * blksize);
	#else
	int result;
	int retries = 10;

	if (blockCount == 0)
	return blockCount;
	while(--retries) {
	result = call_method_1 ("read-blocks", dev, 3, buffer, blockNum, blockCount);
	if (result != 0)
	break;
	call_prom("interpret", 1, 1, " 10 ms");
	}

	return result;
	#endif
	}

	int
	prom_getchar ()
	{
	char c[4];
	int a;

	while ((a = (int)call_prom ("read", 3, 1, prom_stdin, c, 4)) == 0)
	;
	if (a == -1)
	prom_abort ("EOF on console\n");
	if (a == 3 && c[0] == '\e' && c[1] == '[')
	return 0x100 \| c[2];
	return c[0];
	}

	int
	prom_nbgetchar()
	{
	char ch;

	return (int) call_prom("read", 3, 1, prom_stdin, &ch, 1) > 0? ch: -1;
	}

	void
	prom_putchar (char c)
	{
	if (c == '\n')
	call_prom ("write", 3, 1, prom_stdout, "\r\n", 2);
	else
	call_prom ("write", 3, 1, prom_stdout, &c, 1);
	}

	void
	prom_puts (prom_handle file, char *s)
	{
	const char p, q;

	for (p = s; *p != 0; p = q)
	{
	for (q = p; q != 0 && q != '\n'; ++q)
	;
	if (q > p)
	call_prom ("write", 3, 1, file, p, q - p);
	if (*q != 0)
	{
	++q;
	call_prom ("write", 3, 1, file, "\r\n", 2);
	}
	}
	}

	void
	prom_vfprintf (prom_handle file, char *fmt, va_list ap)
	{
	static char printf_buf[2048];
	vsprintf (printf_buf, fmt, ap);
	prom_puts (file, printf_buf);
	}

	void
	prom_vprintf (char *fmt, va_list ap)
	{
	static char printf_buf[2048];
	vsprintf (printf_buf, fmt, ap);
	prom_puts (prom_stdout, printf_buf);
	}

	void
	prom_fprintf (prom_handle file, char *fmt, ...)
	{
	va_list ap;
	va_start (ap, fmt);
	prom_vfprintf (file, fmt, ap);
	va_end (ap);
	}

	void
	prom_printf (char *fmt, ...)
	{
	va_list ap;
	va_start (ap, fmt);
	prom_vfprintf (prom_stdout, fmt, ap);
	va_end (ap);
	}

	void
	prom_perror (int error, char *filename)
	{
	if (error == FILE_ERR_EOF)
	prom_printf("%s: Unexpected End Of File\n", filename);
	else if (error == FILE_ERR_NOTFOUND)
	prom_printf("%s: No such file or directory\n", filename);
	else if (error == FILE_CANT_SEEK)
	prom_printf("%s: Seek error\n", filename);
	else if (error == FILE_IOERR)
	prom_printf("%s: Input/output error\n", filename);
	else if (error == FILE_BAD_PATH)
	prom_printf("%s: Path too long\n", filename);
	else if (error == FILE_ERR_BAD_TYPE)
	prom_printf("%s: Not a regular file\n", filename);
	else if (error == FILE_ERR_NOTDIR)
	prom_printf("%s: Not a directory\n", filename);
	else if (error == FILE_ERR_BAD_FSYS)
	prom_printf("%s: Unknown or corrupt filesystem\n", filename);
	else if (error == FILE_ERR_SYMLINK_LOOP)
	prom_printf("%s: Too many levels of symbolic links\n", filename);
	else if (error == FILE_ERR_LENGTH)
	prom_printf("%s: File too large\n", filename);
	else if (error == FILE_ERR_FSBUSY)
	prom_printf("%s: Filesystem busy\n", filename);
	else if (error == FILE_ERR_BADDEV)
	prom_printf("%s: Unable to open file, Invalid device\n", filename);
	else
	prom_printf("%s: Unknown error\n", filename);
	}

	void
	prom_readline (char prompt, char buf, int len)
	{
	int i = 0;
	int c;

	if (prompt)
	prom_puts (prom_stdout, prompt);

	while (i < len-1 && (c = prom_getchar ()) != '\r')
	{
	if (c >= 0x100)
	continue;
	if (c == 8)
	{
	if (i > 0)
	{
	prom_puts (prom_stdout, "\b \b");
	i--;
	}
	else
	prom_putchar ('\a');
	}
	else if (isprint (c))
	{
	prom_putchar (c);
	buf[i++] = c;
	}
	else
	prom_putchar ('\a');
	}
	prom_putchar ('\n');
	buf[i] = 0;
	}

	#ifdef CONFIG_SET_COLORMAP
	int prom_set_color(prom_handle device, int color, int r, int g, int b)
	{
	return (int)call_prom( "call-method", 6, 1, "color!", device, color, b, g, r );
	}
	#endif /* CONFIG_SET_COLORMAP */

	void
	prom_exit ()
	{
	call_prom ("exit", 0, 0);
	}

	void
	prom_abort (char *fmt, ...)
	{
	va_list ap;
	va_start (ap, fmt);
	prom_vfprintf (prom_stdout, fmt, ap);
	va_end (ap);
	prom_exit ();
	}

	void
	prom_sleep (int seconds)
	{
	int end;
	end = (prom_getms() + (seconds * 1000));
	while (prom_getms() <= end);
	}

	void *
	prom_claim (void *virt, unsigned int size, unsigned int align)
	{
	return call_prom ("claim", 3, 1, virt, size, align);
	}

	void
	prom_release(void *virt, unsigned int size)
	{
	call_prom ("release", 2, 0, virt, size);
	#if 0 /* this is bullshit, newworld OF RELEASE method works fine. */

	/* release in not enough, it needs also an unmap call. This bit of forth
	* code inspired from Darwin's bootloader but could be replaced by direct
	* calls to the MMU package if needed
	*/
	call_prom ("interpret", 3, 1,
	#if DEBUG
	".\" ReleaseMem:\" 2dup . . cr "
	#endif
	"over \" translate\" ^mmu " // Find out physical base
	"^on0 " // Bail if translation failed
	"drop " // Leaving phys on top of stack
	"2dup \" unmap\" ^mmu " // Unmap the space first
	"2dup \" release\" ^mmu " // Then free the virtual pages
	"\" release\" ^mem " // Then free the physical pages
	,size, virt
	);
	#endif /* bullshit */
	}

	void
	prom_map (void phys, void virt, int size)
	{
	unsigned long msr = mfmsr();

	/* Only create a mapping if we're running with relocation enabled. */
	if ( (msr & MSR_IR) && (msr & MSR_DR) )
	call_method_1 ("map", prom_mmu, 4, -1, size, virt, phys);
	}

	void
	prom_unmap (void phys, void virt, int size)
	{
	unsigned long msr = mfmsr();

	/* Only unmap if we're running with relocation enabled. */
	if ( (msr & MSR_IR) && (msr & MSR_DR) )
	call_method_1 ("map", prom_mmu, 4, -1, size, virt, phys);
	}

	char *
	prom_getargs ()
	{
	static char args[256];
	int l;

	l = prom_get_chosen ("bootargs", args, 255);
	args[l] = '\0';
	return args;
	}

	void
	prom_setargs (char *args)
	{
	int l = strlen (args)+1;
	if ((int)call_prom ("setprop", 4, 1, prom_chosen, "bootargs", args, l) != l)
	prom_printf ("can't set args\n");
	}

	int prom_interpret (char *forth)
	{
	return (int)call_prom("interpret", 1, 1, forth);
	}

	int
	prom_getms(void)
	{
	return (int) call_prom("milliseconds", 0, 1);
	}

	void
	prom_pause(void)
	{
	call_prom("enter", 0, 0);
	}

	/*
	* Local variables:
	* c-file-style: "k&r"
	* c-basic-offset: 5
	* End:
	*/