#ifndef CYGONCE_HAL_VARIANT_INC
#define CYGONCE_HAL_VARIANT_INC
##=============================================================================
##
##	variant.inc
##
##	PPC40x family assembler header file
##
##=============================================================================
#####COPYRIGHTBEGIN####
#                                                                          
# -------------------------------------------                              
# The contents of this file are subject to the Red Hat eCos Public License 
# Version 1.1 (the "License"); you may not use this file except in         
# compliance with the License.  You may obtain a copy of the License at    
# http://www.redhat.com/                                                   
#                                                                          
# Software distributed under the License is distributed on an "AS IS"      
# basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
# License for the specific language governing rights and limitations under 
# the License.                                                             
#                                                                          
# The Original Code is eCos - Embedded Configurable Operating System,      
# released September 30, 1998.                                             
#                                                                          
# The Initial Developer of the Original Code is Red Hat.                   
# Portions created by Red Hat are                                          
# Copyright (C) 1998, 1999, 2000, 2001 Red Hat, Inc.                             
# All Rights Reserved.                                                     
# -------------------------------------------                              
#                                                                          
#####COPYRIGHTEND####
##=============================================================================
#######DESCRIPTIONBEGIN####
##
## Author(s): 	jskov
## Contributors:jskov, gthomas
## Date:	2000-08-27
## Purpose:	MPCxxx family definitions.
## Description:	This file contains various definitions and macros that are
##              useful for writing assembly code for the PPC40x CPU family.
## Usage:
##		#include <cyg/hal/variant.inc>
##		...
##		
##
######DESCRIPTIONEND####
##
##=============================================================================

#include <pkgconf/hal.h>
	
#undef CYG_MSR_COMMON
#define CYG_MSR_COMMON (MSR_ME | MSR_RI)

#include <cyg/hal/arch.inc>
#include <cyg/hal/plf.inc>

##-----------------------------------------------------------------------------
## PPC40x defined vectors
                
## Special code to handle the various timers which generate non-standard
## interrupts.  There are really three VSRs here, each 0x10 apart.
        .macro  timer_vector name
        .p2align 8
        .globl  __exception_\name
__exception_\name:
	# Variable timer interrupt
        mtspr   SPRG1,r3                     # stash some work registers away
        mtspr   SPRG2,r4                    
        li      r4,0x1000                    # vector offset
	b	0f
	# Fixed timer interrupt
        mtspr   SPRG1,r3                     # stash some work registers away
        mtspr   SPRG2,r4                    
        li      r4,0x1010                    # vector offset
	b	0f
	# Watchdog timer interrupt
        mtspr   SPRG1,r3                     # stash some work registers away
        mtspr   SPRG2,r4                    
        li      r4,0x1020                    # vector offset
0:      mtspr   SPRG3,r5
        lwi     r3,hal_vsr_table+(0x1000>>6) # table base
        lwz     r3,0(r3)                     # address of vsr
        mflr    r5                           # save link register
        mtlr    r3                           # put vsr address into it
	mr	r3,r4			     # original vector
        mfcr    r4                           # stash CR
        blr                                  # go to common code
        .endm

        .macro hal_extra_vectors
	timer_vector		ppc40x_timers
	exception_vector	data_TLB_miss
	exception_vector	instr_TLB_miss
	exception_vector	reserved_01300
	exception_vector	reserved_01400
	exception_vector	reserved_01500
	exception_vector	reserved_01600
	exception_vector	reserved_01700
	exception_vector	reserved_01800
	exception_vector	reserved_01900
	exception_vector	reserved_01A00
	exception_vector	reserved_01B00
	exception_vector	reserved_01C00
	exception_vector	reserved_01D00
	exception_vector	reserved_01E00
	exception_vector	reserved_01F00
	exception_vector	ppc40x_debug
        .endm

##-----------------------------------------------------------------------------
## PPC40x CPU initialization
##
## Initialize CPU to a post-reset state, ensuring the ground doesn''t
## shift under us while we try to set things up.
        
        .macro hal_cpu_init
        # Set up MSR (disable MMU for now)
        lwi     r3,(CYG_MSR & ~(MSR_IR | MSR_DR))
        sync
	mfmsr	r4
        mtmsr   r3
        sync
        .endm

##-----------------------------------------------------------------------------
## PPC40x monitor initialization

#ifndef CYGPKG_HAL_PPC_MON_DEFINED

#if     defined(CYG_HAL_STARTUP_ROM) ||                 \
        (       defined(CYG_HAL_STARTUP_RAM) &&         \
                !defined(CYGSEM_HAL_USE_ROM_MONITOR))

        .macro  hal_mon_init
#ifdef CYGSEM_HAL_POWERPC_COPY_VECTORS
        # If we are starting up from ROM and want vectors in RAM
        # or we are starting in RAM and NOT using a ROM monitor,
        # copy exception handler code to 0.
        lwi     r3,rom_vectors          # r3 = rom start
        lwi     r4,0                    # r4 = ram start
        lwi     r5,rom_vectors_end      # r5 = rom end
        cmplw   r3,r5                   # skip if no vectors
        beq     2f

        subi    r3,r3,4
        subi    r4,r4,4
        subi    r5,r5,4
1:
        lwzu    r0,4(r3)                # get word from ROM
        stwu    r0,4(r4)                # store in RAM
        cmplw   r3,r5                   # compare
        blt     1b                      # loop if not yet done
2:

	# Ensure that the vectors will come from 0x0000
	lwi	r4,0
	mtspr	SPR_EVPR,r4
#endif

        # Next initialize the VSR table. This happens whether the
        # vectors were copied to RAM or not.

        # First fill with exception handlers
        lwi     r3,cyg_hal_default_exception_vsr
        lwi     r4,hal_vsr_table
        subi    r4,r4,4
        li      r5,CYGNUM_HAL_VSR_COUNT
1:      stwu    r3,4(r4)
        subi    r5,r5,1
        cmpwi   r5,0
        bne     1b

        # Then fill in the special vectors
        lwi     r3,cyg_hal_default_interrupt_vsr
        lwi     r4,hal_vsr_table
        stw     r3,CYGNUM_HAL_VECTOR_INTERRUPT*4(r4)
        stw     r3,CYGNUM_HAL_VECTOR_DECREMENTER*4(r4)
        stw     r3,CYGNUM_HAL_VECTOR_TIMERS*4(r4)
        .endm

#elif defined(CYG_HAL_STARTUP_RAM) && defined(CYGSEM_HAL_USE_ROM_MONITOR)

        # Initialize the VSR table entries
        # We only take control of the interrupt vectors,
        # the rest are left to the ROM for now...

        .macro  hal_mon_init
        lwi     r3,cyg_hal_default_interrupt_vsr
        lwi     r4,hal_vsr_table
        stw     r3,CYGNUM_HAL_VECTOR_INTERRUPT*4(r4)
        stw     r3,CYGNUM_HAL_VECTOR_DECREMENTER*4(r4)
        stw     r3,CYGNUM_HAL_VECTOR_TIMERS*4(r4)
        .endm


#else

        .macro  hal_mon_init

        .endm

#endif


#define CYGPKG_HAL_PPC_MON_DEFINED

#endif // CYGPKG_HAL_PPC_MON_DEFINED

##-----------------------------------------------------------------------------
## PPC40x exception state handling
        .macro	hal_variant_save regs
        .endm

        .macro	hal_variant_load regs
        .endm

##-----------------------------------------------------------------------------
## Indicate that the ISR tables are defined in variant.S

#define CYG_HAL_PPC_ISR_TABLES_DEFINED

##-----------------------------------------------------------------------------
## MPC4xx interrupt handling.

## Decode the EXISR appropriately

#define CYGPKG_HAL_POWERPC_INTC_DEFINED
        # decode the interrupt
	# the interrupt vector will be 0x500 or 0x10x0
	# 0x0500 = external, must be decoded via EXISR
	# 0x10X0 = timer, X is the timer type
	# r3 used as scratch
	.macro  hal_intc_decode dreg,state
        lwz     \dreg,CYGARC_PPCREG_VECTOR(\state) # retrieve vector number,
	extrwi.	\dreg,\dreg,1,19		# isolate bit 19
	beq	0f				# timer interrupt = 1
        lwz     \dreg,CYGARC_PPCREG_VECTOR(\state) # retrieve vector number,
	extrwi	\dreg,\dreg,2,26		# isolate bits 26-27
	addi	\dreg,\dreg,CYGNUM_HAL_INTERRUPT_VAR_TIMER # FIXME
	b	1f
0:	mfdcr	r3,DCR_EXISR			# Interrupt status register
	lwi	\dreg,0x8FF0001F		# significant bits
	and	\dreg,\dreg,r3
	cntlzw	r3,\dreg			# find highest "1" bit
	slwi	r3,r3,2
	lwi	\dreg,EXISR_TAB			# convert bit # to signal #
	lwzx	\dreg,\dreg,r3
1:      stw     \dreg,CYGARC_PPCREG_VECTOR(\state) # update vector in state frame.
        slwi    \dreg,\dreg,2                   # convert to byte offset.
        .endm                              


#------------------------------------------------------------------------------
#endif // ifndef CYGONCE_HAL_VARIANT_INC
# end of variant.inc
