forked from Imagelibrary/rtems
4a238002e7
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
200 lines
3.7 KiB
Plaintext
200 lines
3.7 KiB
Plaintext
/*
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* Authors: Ralf Corsepius (corsepiu@faw.uni-ulm.de) and
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* Bernd Becker (becker@faw.uni-ulm.de)
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*
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* COPYRIGHT (c) 1997-1998, FAW Ulm, Germany
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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*
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* COPYRIGHT (c) 1998.
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* On-Line Applications Research Corporation (OAR).
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* Copyright assigned to U.S. Government, 1994.
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.OARcorp.com/rtems/license.html.
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*
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* Modified to reflect Hitachi EDK SH7045F:
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* John M. Mills (jmills@tga.com)
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* TGA Technologies, Inc.
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* 100 Pinnacle Way, Suite 140
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* Norcross, GA 30071 U.S.A.
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*
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*
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* This modified file may be copied and distributed in accordance
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* the above-referenced license. It is provided for critique and
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* developmental purposes without any warranty nor representation
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* by the authors or by TGA Technologies.
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*
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* $Id$
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*/
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#include "asm.h"
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BEGIN_CODE
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PUBLIC(start)
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SYM (start):
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! install the stack pointer
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mov.l stack_k,r15
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#ifdef START_HW_INIT /* from $RTEMS_BSP.cfg */
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! Initialize minimal hardware
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mov.l hw_init_k, r0
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jsr @r0
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nop !debug dead-slot target
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#endif /* START_HW_INIT */
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! zero out bss
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mov.l edata_k,r0
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mov.l end_k,r1
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mov #0,r2
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0:
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mov.l r2,@r0
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add #4,r0
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cmp/ge r0,r1
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bt 0b
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nop !debug dead-slot target
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! copy the vector table from rom to ram
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mov.l vects_k,r0 ! vectab
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mov #0,r1 ! address of boot vector table
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mov #0,r2 ! number of bytes copied
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mov.w vects_size,r3 ! size of entries in vectab
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1:
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mov.l @r1+,r4
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mov.l r4,@r0
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add #4,r0
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add #1,r2
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cmp/hi r3,r2
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bf 1b
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nop !debug dead-slot target
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! overlay monitor vectors onto RTEMS table template
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! code adapted from Hitachi EDK7045F User Manual: "Copyvect.s"
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mova vects_k,r0
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mov.l @r0, r1 ! Shadow vect tbl addr
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stc vbr, r2 ! Original vect tbl addr
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and #0, r0
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mov r0, r4 ! 0 in r4 and r0
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!trapa #32
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or #0x80, r0
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mov.l @(r0,r2), r3
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mov.l r3, @(r0, r1)
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mov r4, r0
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!cpu addr err
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or #0x24, r0
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mov.l @(r0, r2), r3
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mov.l r3, @(r0, r1)
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mov r4, r0
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!ill slot
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or #0x18, r0
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mov.l @(r0, r2), r3
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mov.l r3, @(r0, r1)
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mov r4, r0
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!ill inst
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or #0x10, r0
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mov.l @(r0, r2), r3
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mov.l r3, @(r0, r1)
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mov r4, r0
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!nmi
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or #0x2c, r0
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mov.l @(r0, r2), r3
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mov.l r3, @(r0, r1)
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mov r4, r0
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!User brk
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or #0x30, r0
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mov.l @(r0, r2), r3
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mov.l r3, @(r0, r1)
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mov r4, r0
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!sci0 err
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or #0x80, r0
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rotl r0
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rotl r0
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mov.l @(r0, r2), r3
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mov.l r3, @(r0, r1)
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mov r4, r0
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!sci rx
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or #0x81, r0
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rotl r0
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rotl r0
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mov.l @(r0, r2), r3
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mov.l r3, @(r0, r1)
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stc vbr,r3 ! capture copy of monitor vbr
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mov.l vbrtemp_k,r0
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mov.l r3, @r0
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mov.l vects_k,r0 ! point vbr to vectab
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ldc r0,vbr
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! call the mainline
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mov #0,r4 ! argc
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mov #0,r5 ! argv - can place in dead slot
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mov.l main_k,r0
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jsr @r0
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nop !debug dead-slot target
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! call exit
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mov r0,r4
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mov.l exit_k,r0
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or r0,r0
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jsr @r0
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nop !debug dead-slot target
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mov.l vbrtemp_k,r0 ! restore original vbr
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mov.l @r0,r3
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ldc r3, vbr
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trapa #13 ! UBR capture by monitor
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nop !debug dead-slot target
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END_CODE
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.align 2
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stack_k:
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.long SYM(stack)
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edata_k:
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.long SYM(edata)
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end_k:
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.long SYM(end)
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main_k:
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.long SYM(boot_card)
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exit_k:
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.long SYM(exit)
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#ifdef START_HW_INIT /* from $RTEMS_BSP.cfg */
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hw_init_k:
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.long SYM(hw_initialize)
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#endif /* START_HW_INIT */
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vbrtemp_k:
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.long SYM(vbrtemp)
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vects_k:
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.long SYM(vectab)
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vects_size:
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.word 255
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#ifdef __ELF__
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.section .stack,"aw"
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#else
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.section .stack
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#endif
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SYM(stack):
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.long 0xdeaddead
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#ifdef __ELF__
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.section .bss,"aw"
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#else
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.section .bss
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#endif
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SYM(vbrtemp):
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.long 0x0
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