Patch from "John M. Mills" <jmills@tga.com> with subsequent cleanup from

Ralf Corsepius <corsepiu@faw.uni-ulm.de> that adds initial Hitachi SH-2
support to RTEMS.  Ralf's comments are:

    Changes:
    ------
    1. SH-Port:
    * Many files renamed.
    * CONSOLE_DEVNAME  and MHZ defines removed from libcpu.
    * console.c moved to libbsp/sh/shared, build in libbsp/sh/<BSP>/console
      applying VPATH.
    * CONSOLE_DEVNAME made BSP-specific, replacement is defined in bsp.h
    * MHZ define replaced with HZ (extendent resolution) in custom/*.cfg
    * -DHZ=HZ  used in bspstart.c, only
    * Makefile variable HZ used in bsp-dependent directories only.

    2. SH1-Port
    * clock-driver rewritten to provide better resolution for odd CPU
      frequencies. This driver is only partially tested on hardware, ie.
      sightly experimental, but I don't expect severe problems with it.
    * Polling SCI-driver added. This driver is experimental and completly
      untested yet. Therefore it is not yet used for the console (/dev/console
      is still pointing to /dev/null, cf. gensh1/bsp.h).
    * minor changes to the timer driver
    * SH1 specific delay()/CPU_delay() now is implemented as a function

    3. SH2-Port
    * Merged
    * IMO, the code is still in its infancy. Therefore I have interspersed
      comments (FIXME) it for items which I think John should look after.
    * sci and console drivers partially rewritten and extended (John, I hope
      you don't mind).
    * Copyright notices are not yet adapted

1 files changed, 94 insertions, 0 deletions

diff --git a/c/src/lib/libbsp/sh/gensh2/start/start.rom b/c/src/lib/libbsp/sh/gensh2/start/start.rom
new file mode 100644
index 0000000000..9deeb53fed
--- /dev/null
+++ b/c/src/lib/libbsp/sh/gensh2/start/start.rom
@@ -0,0 +1,94 @@
+/*
+ *  Authors: Ralf Corsepius (corsepiu@faw.uni-ulm.de) and
+ *           Bernd Becker (becker@faw.uni-ulm.de)
+ *
+ *  COPYRIGHT (c) 1997-1998, FAW Ulm, Germany
+ *
+ *  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.
+ *
+ *
+ *  COPYRIGHT (c) 1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id$
+ */
+
+#include "asm.h"
+
+	BEGIN_CODE
+	PUBLIC(start)
+SYM (start):
+        ! install the stack pointer
+	mov.l	stack_k,r15
+
+	! zero out bss
+	mov.l	edata_k,r0
+	mov.l	end_k,r1
+	mov	#0,r2
+0:
+	mov.l	r2,@r0
+	add	#4,r0
+	cmp/ge	r0,r1
+	bt	0b
+
+	! copy the vector table from rom to ram
+	mov.l   vects_k,r0   	! vectab
+	mov	#0,r1		! address of boot vector table
+	mov     #0,r2		| number of bytes copied
+	mov.w   vects_size,r3   ! size of entries in vectab
+1:
+	mov.l   @r1+,r4
+	mov.l   r4,@r0
+	add     #4,r0
+	add     #1,r2
+	cmp/hi  r3,r2
+	bf      1b
+
+	mov.l   vects_k,r0   	! update vbr to point to vectab
+	ldc     r0,vbr
+
+	! call the mainline	
+	mov #0,r4		! argc
+	mov.l main_k,r0
+	jsr @r0
+	mov #0,r5		! argv
+
+	! call exit
+	mov	r0,r4
+	mov.l	exit_k,r0
+	jsr	@r0
+	or	r0,r0
+
+	END_CODE
+
+	.align 2
+stack_k:
+	.long	SYM(stack)	
+edata_k:
+	.long	SYM(edata)
+end_k:
+	.long	SYM(end)
+main_k:
+	.long	SYM(boot_card)
+exit_k:
+	.long	SYM(exit)
+
+vects_k:
+	.long	SYM(vectab)
+vects_size:
+	.word	255
+
+#ifdef __ELF__
+	.section .stack,"aw"
+#else
+	.section .stack
+#endif
+SYM(stack):
+	.long	0xdeaddead