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Import of OpenBSD 4.2 release kernel tree with initial code to support 
Jornada 720/728, StrongARM 1110-based handheld PC.
At this point kernel roots on NFS and boots into vfs_mountroot() and traps.
What is supported:
- glass console, Jornada framebuffer (jfb) works in 16bpp direct color mode
(needs some palette tweaks for non black/white/blue colors, i think)
- saic, SA11x0 interrupt controller (needs cleanup)
- sacom, SA11x0 UART (supported only as boot console for now)
- SA11x0 GPIO controller fully supported (but can't handle multiple interrupt
handlers on one gpio pin)
- sassp, SSP port on SA11x0 that attaches spibus
- Jornada microcontroller (jmcu) to control kbd, battery, etc throught
the SPI bus (wskbd attaches on jmcu, but not tested)
- tod functions seem work
- initial code for SA-1111 (chip companion) : this is TODO

Next important steps, i think:
- gpio and intc on sa1111
- pcmcia support for sa11x0 (and sa1111 help logic)
- REAL root on nfs when we have PCMCIA support (we may use any of supported pccard NICs)
- root on wd0! (using already supported PCMCIA-ATA)

/*	$OpenBSD: va-ppc.h,v 1.13 2006/04/09 03:07:53 deraadt Exp $	*/
/* GNU C varargs support for the PowerPC with either the V.4 or Windows NT calling sequences */

#include <sys/cdefs.h>

#ifndef _WIN32
/* System V.4 support */
/* Define __gnuc_va_list.  */

#ifndef __GNUC_VA_LIST
#define __GNUC_VA_LIST

#ifndef _SYS_VA_LIST_H
#define _SYS_VA_LIST_H		/* Solaris sys/va_list.h */

/* Solaris decided to rename overflow_arg_area to input_arg_area,
   so handle it via a macro.  */
#define __va_overflow(AP) (AP)->overflow_arg_area

/* Note that the names in this structure are in the user's namespace, but
   that the V.4 abi explicitly states that these names should be used.  */
typedef struct __va_list_tag {
  unsigned char gpr;		/* index into the array of 8 GPRs stored in the
				   register save area gpr=0 corresponds to r3,
				   gpr=1 to r4, etc. */
  unsigned char fpr;		/* index into the array of 8 FPRs stored in the
				   register save area fpr=0 corresponds to f1,
				   fpr=1 to f2, etc. */
  char *overflow_arg_area;	/* location on stack that holds the next
				   overflow argument */
  char *reg_save_area;		/* where r3:r10 and f1:f8, if saved are stored */
} __gnuc_va_list[1];

#else /* _SYS_VA_LIST */

typedef __va_list __gnuc_va_list;
#define __va_overflow(AP) (AP)->input_arg_area

#endif /* not _SYS_VA_LIST */
#endif /* not __GNUC_VA_LIST */

/* If this is for internal libc use, don't define anything but
   __gnuc_va_list.  */
#if defined (_STDARG_H) || defined (_VARARGS_H)

/* Register save area located below the frame pointer */
#ifndef __VA_PPC_H__
#define __VA_PPC_H__
typedef struct {
  long   __gp_save[8];		/* save area for GP registers */
  double __fp_save[8];		/* save area for FP registers */
} __va_regsave_t;

/* Macros to access the register save area */
/* We cast to void * and then to TYPE * because this avoids
   a warning about increasing the alignment requirement.  */
#define __VA_FP_REGSAVE(AP,OFS,TYPE)					\
  ((TYPE *) (void *) (&(((__va_regsave_t *)				\
			 (AP)->reg_save_area)->__fp_save[OFS])))

#define __VA_GP_REGSAVE(AP,OFS,TYPE)					\
  ((TYPE *) (void *) (&(((__va_regsave_t *)				\
			 (AP)->reg_save_area)->__gp_save[OFS])))

/* Common code for va_start for both varargs and stdarg.  We allow all
   the work to be done by __builtin_saveregs.  It returns a pointer to
   a va_list that was constructed on the stack; we must simply copy it
   to the user's variable.  */

#define __va_start_common(AP, FAKE) \
__extension__ ({							\
   (AP) = (struct __va_list_tag *)__builtin_alloca(sizeof(__gnuc_va_list));   \
  __builtin_memcpy ((AP), __builtin_saveregs (), sizeof(__gnuc_va_list)); \
  })

#ifdef _STDARG_H /* stdarg.h support */

/* Calling __builtin_next_arg gives the proper error message if LASTARG is
   not indeed the last argument.  */
#ifdef lint
#define va_start(AP,LASTARG)	((AP) = (AP))
#else
#define va_start(AP,LASTARG) \
  (__builtin_next_arg (LASTARG), __va_start_common (AP, 0))
#endif /* lint */

#else /* varargs.h support */

#define va_start(AP) __va_start_common (AP, 1)
#define va_alist __va_1st_arg
#define va_dcl register int va_alist; ...

#endif /* _STDARG_H */

#ifdef _SOFT_FLOAT
#define __va_float_p(TYPE)	0
#else
#define __va_float_p(TYPE)	(__builtin_classify_type(*(TYPE *)0) == 8)
#endif

#define __va_aggregate_p(TYPE)	(__builtin_classify_type(*(TYPE *)0) >= 12)
#define __va_size(TYPE)		((sizeof(TYPE) + sizeof (long) - 1) / sizeof (long))

/* This symbol isn't defined.  It is used to flag type promotion violations
   at link time.  We can only do this when optimizing.  Use __builtin_trap
   instead of abort so that we don't require a prototype for abort.

   __builtin_trap stuff is not available on the gcc-2.95 branch, so we just
   avoid calling it for now.  */

#ifdef __OPTIMIZE__
extern void __va_arg_type_violation(void) __attribute__((__noreturn__));
#else
#define __va_arg_type_violation()
#endif

#define va_arg(AP,TYPE)							   \
__extension__ (*({							   \
  register TYPE *__ptr;							   \
									   \
  if (__va_float_p (TYPE) && sizeof (TYPE) < 16)			   \
    {									   \
      unsigned char __fpr = (AP)->fpr;					   \
      if (__fpr < 8)							   \
	{								   \
	  __ptr = __VA_FP_REGSAVE (AP, __fpr, TYPE);			   \
	  (AP)->fpr = __fpr + 1;					   \
	}								   \
      else if (sizeof (TYPE) == 8)					   \
	{								   \
	  unsigned long __addr = (unsigned long) (__va_overflow (AP));	   \
	  __ptr = (TYPE *)((__addr + 7) & -8);				   \
	  __va_overflow (AP) = (char *)(__ptr + 1);			   \
	}								   \
      else								   \
	{								   \
	  /* float is promoted to double.  */				   \
	  __va_arg_type_violation ();					   \
	}								   \
    }									   \
									   \
  /* Aggregates and long doubles are passed by reference.  */		   \
  else if (__va_aggregate_p (TYPE) || __va_float_p (TYPE))		   \
    {									   \
      unsigned char __gpr = (AP)->gpr;					   \
      if (__gpr < 8)							   \
	{								   \
	  __ptr = * __VA_GP_REGSAVE (AP, __gpr, TYPE *);		   \
	  (AP)->gpr = __gpr + 1;					   \
	}								   \
      else								   \
	{								   \
	  TYPE **__pptr = (TYPE **) (__va_overflow (AP));		   \
	  __ptr = * __pptr;						   \
	  __va_overflow (AP) = (char *) (__pptr + 1);			   \
	}								   \
    }									   \
									   \
  /* Only integrals remaining.  */					   \
  else									   \
    {									   \
      /* longlong is aligned.  */					   \
      if (sizeof (TYPE) == 8)						   \
	{								   \
	  unsigned char __gpr = (AP)->gpr;				   \
	  if (__gpr < 7)						   \
	    {								   \
	      __gpr += __gpr & 1;					   \
	      __ptr = __VA_GP_REGSAVE (AP, __gpr, TYPE);		   \
	      (AP)->gpr = __gpr + 2;					   \
	    }								   \
	  else								   \
	    {								   \
	      unsigned long __addr = (unsigned long) (__va_overflow (AP)); \
	      __ptr = (TYPE *)((__addr + 7) & -8);			   \
	      (AP)->gpr = 8;						   \
	      __va_overflow (AP) = (char *)(__ptr + 1);			   \
	    }								   \
	}								   \
      else if (sizeof (TYPE) == 4)					   \
	{								   \
	  unsigned char __gpr = (AP)->gpr;				   \
	  if (__gpr < 8)						   \
	    {								   \
	      __ptr = __VA_GP_REGSAVE (AP, __gpr, TYPE);		   \
	      (AP)->gpr = __gpr + 1;					   \
	    }								   \
	  else								   \
	    {								   \
	      __ptr = (TYPE *) __va_overflow (AP);			   \
	      __va_overflow (AP) = (char *)(__ptr + 1);			   \
	    }								   \
	}								   \
      else								   \
	{								   \
	  /* Everything else was promoted to int.  */			   \
	  __va_arg_type_violation ();					   \
	}								   \
    }									   \
  __ptr;								   \
}))

#define va_end(AP)	

/* Copy __gnuc_va_list into another variable of this type.  */
#define __va_copy(dest, src) \
__extension__ ({ \
        (dest) =  \
           (struct __va_list_tag *)__builtin_alloca(sizeof(__gnuc_va_list)); \
        *(dest) = *(src);\
  })

#if __ISO_C_VISIBLE >= 1999
#define va_copy(dest, src)	__va_copy(dest, src)
#endif

#endif /* __VA_PPC_H__ */
#endif /* defined (_STDARG_H) || defined (_VARARGS_H) */


#else
/* Windows NT */
/* Define __gnuc_va_list.  */

#ifndef __GNUC_VA_LIST
#define __GNUC_VA_LIST
typedef char *__gnuc_va_list;
#endif /* not __GNUC_VA_LIST */

/* If this is for internal libc use, don't define anything but
   __gnuc_va_list.  */
#if defined (_STDARG_H) || defined (_VARARGS_H)

#define __va_start_common(AP, LASTARG, FAKE)				\
  ((__builtin_saveregs ()), ((AP) = ((char *) &LASTARG) + __va_rounded_size (AP)), 0)

#ifdef _STDARG_H /* stdarg.h support */

/* Calling __builtin_next_arg gives the proper error message if LASTARG is
   not indeed the last argument.  */
#define va_start(AP,LASTARG)						\
  (__builtin_saveregs (),						\
   (AP) = __builtin_next_arg (LASTARG),					\
   0)

#else /* varargs.h support */

#define va_start(AP)							\
  (__builtin_saveregs (),						\
   (AP) = __builtin_next_arg (__va_1st_arg) - sizeof (int),		\
   0)

#define va_alist __va_1st_arg
#define va_dcl register int __va_1st_arg; ...

#endif /* _STDARG_H */

#define __va_rounded_size(TYPE) ((sizeof (TYPE) + 3) & ~3)
#define __va_align(AP, TYPE)						\
     ((((unsigned long)(AP)) + ((sizeof (TYPE) >= 8) ? 7 : 3))		\
      & ~((sizeof (TYPE) >= 8) ? 7 : 3))

#define va_arg(AP,TYPE)							\
( *(TYPE *)((AP = (char *) (__va_align(AP, TYPE)			\
			    + __va_rounded_size(TYPE)))			\
	    - __va_rounded_size(TYPE)))

#define va_end(AP)	

/* Copy __gnuc_va_list into another variable of this type.  */
#define __va_copy(dest, src) (dest) = (src)

#endif /* defined (_STDARG_H) || defined (_VARARGS_H) */
#endif /* Windows NT */