;-------------------------------------------------------------------------------
; sys_core.asm
;
; Copyright (C) 2009-2015 Texas Instruments Incorporated - www.ti.com
;
;
;  Redistribution and use in source and binary forms, with or without
;  modification, are permitted provided that the following conditions
;  are met:
;
;    Redistributions of source code must retain the above copyright
;    notice, this list of conditions and the following disclaimer.
;
;    Redistributions in binary form must reproduce the above copyright
;    notice, this list of conditions and the following disclaimer in the
;    documentation and/or other materials provided with the
;    distribution.
;
;    Neither the name of Texas Instruments Incorporated nor the names of
;    its contributors may be used to endorse or promote products derived
;    from this software without specific prior written permission.
;
;  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
;  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
;  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
;  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
;  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
;  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
;  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
;  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
;  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
;  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
;  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;
;
;

    .text
    .arm

;-------------------------------------------------------------------------------
; Initialize CPU Registers
; SourceId : CORE_SourceId_001
; DesignId : CORE_DesignId_001
; Requirements: HL_SR477, HL_SR476, HL_SR492

    .def     _coreInitRegisters_
    .asmfunc


_coreInitRegisters_


    ; After reset, the CPU is in the Supervisor mode (M = 10011)
        mov r0, lr
        mov r1, #0x0000
        mov r2, #0x0000
        mov r3, #0x0000
        mov r4, #0x0000
        mov r5, #0x0000
        mov r6, #0x0000
        mov r7, #0x0000
        mov r8, #0x0000
        mov r9, #0x0000
        mov r10, #0x0000
        mov r11, #0x0000
        mov r12, #0x0000
        mov r13, #0x0000
        mrs r1, cpsr
        msr spsr_cxsf, r1
        ; Switch to FIQ mode (M = 10001)
        cps #17
        mov lr, r0
        mov r8, #0x0000
        mov r9, #0x0000
        mov r10, #0x0000
        mov r11, #0x0000
        mov r12, #0x0000
        mrs r1, cpsr
        msr spsr_cxsf, r1
        ; Switch to IRQ mode (M = 10010)
        cps #18
        mov lr, r0
        mrs r1,cpsr
        msr spsr_cxsf, r1
        ; Switch to Abort mode (M = 10111)
        cps #23
        mov lr, r0
        mrs r1,cpsr
        msr spsr_cxsf, r1
        ; Switch to Undefined Instruction Mode (M = 11011)
        cps #27
        mov lr, r0
        mrs r1,cpsr
        msr spsr_cxsf, r1
        ; Switch to System Mode ( Shares User Mode registers ) (M = 11111)
        cps #31
        mov lr, r0
        mrs r1,cpsr
        msr spsr_cxsf, r1

        bl    next1
next1
        bl    next2
next2
        bl    next3
next3
        bl    next4
next4
        bx    r0

    .endasmfunc


;-------------------------------------------------------------------------------
; Initialize Stack Pointers
; SourceId : CORE_SourceId_002
; DesignId : CORE_DesignId_002
; Requirements: HL_SR478

    .def     _coreInitStackPointer_
    .asmfunc

_coreInitStackPointer_

        cps   #17
        ldr   sp,       fiqSp
        cps   #18
        ldr   sp,       irqSp
        cps   #19
        ldr   sp,       svcSp
        cps   #23
        ldr   sp,       abortSp
        cps   #27
        ldr   sp,       undefSp
        cps   #31
        ldr   sp,       userSp
        bx    lr

userSp  .word 0x08000000+0x00001000
svcSp   .word 0x08000000+0x00001000+0x00000100
fiqSp   .word 0x08000000+0x00001000+0x00000100+0x00000100
irqSp   .word 0x08000000+0x00001000+0x00000100+0x00000100+0x00000100
abortSp .word 0x08000000+0x00001000+0x00000100+0x00000100+0x00000100+0x00000100
undefSp .word 0x08000000+0x00001000+0x00000100+0x00000100+0x00000100+0x00000100+0x00000100

    .endasmfunc

;-------------------------------------------------------------------------------
; Get CPSR Value
; SourceId : CORE_SourceId_003
; DesignId : CORE_DesignId_003
; Requirements:

    .def     _getCPSRValue_
    .asmfunc

_getCPSRValue_

        mrs   r0, CPSR
        bx    lr

    .endasmfunc

;-------------------------------------------------------------------------------
; Take CPU to IDLE state
; SourceId : CORE_SourceId_004
; DesignId : CORE_DesignId_004
; Requirements: HL_SR493

    .def     _gotoCPUIdle_
    .asmfunc

_gotoCPUIdle_

        WFI
        nop
        nop
        nop
        nop
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Enable Event Bus Export
; SourceId : CORE_SourceId_006
; DesignId : CORE_DesignId_007
; Requirements: HL_SR479

    .def     _coreEnableEventBusExport_
    .asmfunc

_coreEnableEventBusExport_

        stmfd sp!, {r0}
        mrc   p15, #0x00, r0,         c9, c12, #0x00
        orr   r0,  r0,    #0x10
        mcr   p15, #0x00, r0,         c9, c12, #0x00
        ldmfd sp!, {r0}
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Disable Event Bus Export
; SourceId : CORE_SourceId_007
; DesignId : CORE_DesignId_008
; Requirements: HL_SR481


    .def     _coreDisableEventBusExport_
    .asmfunc

_coreDisableEventBusExport_

        stmfd sp!, {r0}
        mrc   p15, #0x00, r0,         c9, c12, #0x00
        bic   r0,  r0,    #0x10
        mcr   p15, #0x00, r0,         c9, c12, #0x00
        ldmfd sp!, {r0}
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Enable RAM ECC Support
; SourceId : CORE_SourceId_008
; DesignId : CORE_DesignId_009
; Requirements: HL_SR480

    .def     _coreEnableRamEcc_
    .asmfunc

_coreEnableRamEcc_

        stmfd sp!, {r0}
        mrc   p15, #0x00, r0,         c1, c0,  #0x01
        orr   r0,  r0,    #0x0C000000
        mcr   p15, #0x00, r0,         c1, c0,  #0x01
        ldmfd sp!, {r0}
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Disable RAM ECC Support
; SourceId : CORE_SourceId_009
; DesignId : CORE_DesignId_010
; Requirements: HL_SR482

    .def     _coreDisableRamEcc_
    .asmfunc

_coreDisableRamEcc_

        stmfd sp!, {r0}
        mrc   p15, #0x00, r0,         c1, c0,  #0x01
        bic   r0,  r0,    #0x0C000000
        mcr   p15, #0x00, r0,         c1, c0,  #0x01
        ldmfd sp!, {r0}
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Enable Flash ECC Support
; SourceId : CORE_SourceId_010
; DesignId : CORE_DesignId_011
; Requirements: HL_SR480, HL_SR458

    .def     _coreEnableFlashEcc_
    .asmfunc

_coreEnableFlashEcc_

        stmfd sp!, {r0}
        mrc   p15, #0x00, r0,         c1, c0,  #0x01
        orr   r0,  r0,    #0x02000000
        dmb
        mcr   p15, #0x00, r0,         c1, c0,  #0x01
        ldmfd sp!, {r0}
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Disable Flash ECC Support
; SourceId : CORE_SourceId_011
; DesignId : CORE_DesignId_012
; Requirements: HL_SR482

    .def     _coreDisableFlashEcc_
    .asmfunc

_coreDisableFlashEcc_

        stmfd sp!, {r0}
        mrc   p15, #0x00, r0,         c1, c0,  #0x01
        bic   r0,  r0,    #0x02000000
        mcr   p15, #0x00, r0,         c1, c0,  #0x01
        ldmfd sp!, {r0}
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Enable Offset via Vic controller
; SourceId : CORE_SourceId_012
; DesignId : CORE_DesignId_005
; Requirements: HL_SR483, HL_SR491

    .def     _coreEnableIrqVicOffset_
    .asmfunc

_coreEnableIrqVicOffset_

        stmfd sp!, {r0}
        mrc   p15, #0, r0,         c1, c0,  #0
        orr   r0,  r0,    #0x01000000
        mcr   p15, #0, r0,         c1, c0,  #0
        ldmfd sp!, {r0}
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Get data fault status register
; SourceId : CORE_SourceId_013
; DesignId : CORE_DesignId_013
; Requirements: HL_SR495

    .def     _coreGetDataFault_
    .asmfunc

_coreGetDataFault_

        mrc   p15, #0, r0, c5, c0,  #0
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Clear data fault status register
; SourceId : CORE_SourceId_014
; DesignId : CORE_DesignId_014
; Requirements: HL_SR495

    .def     _coreClearDataFault_
    .asmfunc

_coreClearDataFault_

        stmfd sp!, {r0}
        mov   r0,  #0
        mcr   p15, #0, r0, c5, c0,  #0
        ldmfd sp!, {r0}
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Get instruction fault status register
; SourceId : CORE_SourceId_015
; DesignId : CORE_DesignId_015
; Requirements: HL_SR495

    .def     _coreGetInstructionFault_
    .asmfunc

_coreGetInstructionFault_

        mrc   p15, #0, r0, c5, c0, #1
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Clear instruction fault status register
; SourceId : CORE_SourceId_016
; DesignId : CORE_DesignId_016
; Requirements: HL_SR495

    .def     _coreClearInstructionFault_
    .asmfunc

_coreClearInstructionFault_

        stmfd sp!, {r0}
        mov   r0,  #0
        mcr   p15, #0, r0, c5, c0, #1
        ldmfd sp!, {r0}
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Get data fault address register
; SourceId : CORE_SourceId_017
; DesignId : CORE_DesignId_017
; Requirements: HL_SR495

    .def     _coreGetDataFaultAddress_
    .asmfunc

_coreGetDataFaultAddress_

        mrc   p15, #0, r0, c6, c0,  #0
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Clear data fault address register
; SourceId : CORE_SourceId_018
; DesignId : CORE_DesignId_018
; Requirements: HL_SR495

    .def     _coreClearDataFaultAddress_
    .asmfunc

_coreClearDataFaultAddress_

        stmfd sp!, {r0}
        mov   r0,  #0
        mcr   p15, #0, r0, c6, c0,  #0
        ldmfd sp!, {r0}
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Get instruction fault address register
; SourceId : CORE_SourceId_019
; DesignId : CORE_DesignId_019
; Requirements: HL_SR495

    .def     _coreGetInstructionFaultAddress_
    .asmfunc

_coreGetInstructionFaultAddress_

        mrc   p15, #0, r0, c6, c0, #2
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Clear instruction fault address register
; SourceId : CORE_SourceId_020
; DesignId : CORE_DesignId_020
; Requirements: HL_SR495

    .def     _coreClearInstructionFaultAddress_
    .asmfunc

_coreClearInstructionFaultAddress_

        stmfd sp!, {r0}
        mov   r0,  #0
        mcr   p15, #0, r0, c6, c0, #2
        ldmfd sp!, {r0}
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Get auxiliary data fault status register
; SourceId : CORE_SourceId_021
; DesignId : CORE_DesignId_021
; Requirements: HL_SR496

    .def     _coreGetAuxiliaryDataFault_
    .asmfunc

_coreGetAuxiliaryDataFault_

        mrc   p15, #0, r0, c5, c1, #0
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Clear auxiliary data fault status register
; SourceId : CORE_SourceId_022
; DesignId : CORE_DesignId_022
; Requirements: HL_SR496

    .def     _coreClearAuxiliaryDataFault_
    .asmfunc

_coreClearAuxiliaryDataFault_

        stmfd sp!, {r0}
        mov   r0,  #0
        mcr   p15, #0, r0, c5, c1, #0
        ldmfd sp!, {r0}
        bx    lr

    .endasmfunc


;-------------------------------------------------------------------------------
; Get auxiliary instruction fault status register
; SourceId : CORE_SourceId_023
; DesignId : CORE_DesignId_023
; Requirements: HL_SR496

    .def     _coreGetAuxiliaryInstructionFault_
    .asmfunc

_coreGetAuxiliaryInstructionFault_

        mrc   p15, #0, r0, c5, c1, #1
        bx    lr

    .endasmfunc

;-------------------------------------------------------------------------------
; Clear auxiliary instruction fault status register
; SourceId : CORE_SourceId_024
; DesignId : CORE_DesignId_024
; Requirements: HL_SR496

    .def     _coreClearAuxiliaryInstructionFault_
    .asmfunc

_coreClearAuxiliaryInstructionFault_

        stmfd sp!, {r0}
        mov   r0,  #0
        mrc   p15, #0, r0, c5, c1, #1
        ldmfd sp!, {r0}
        bx    lr

    .endasmfunc

;-------------------------------------------------------------------------------
; Disable interrupts - R4 IRQ & FIQ
; SourceId : CORE_SourceId_025
; DesignId : CORE_DesignId_025
; Requirements: HL_SR494

        .def _disable_interrupt_
        .asmfunc

_disable_interrupt_

        cpsid if
        bx    lr

        .endasmfunc

;-------------------------------------------------------------------------------
; Disable FIQ interrupt
; SourceId : CORE_SourceId_026
; DesignId : CORE_DesignId_026
; Requirements: HL_SR494

        .def _disable_FIQ_interrupt_
        .asmfunc

_disable_FIQ_interrupt_

        cpsid f
        bx    lr

        .endasmfunc

;-------------------------------------------------------------------------------
; Disable FIQ interrupt

        .def _disable_IRQ_interrupt_
        .asmfunc

_disable_IRQ_interrupt_

        cpsid i
        bx    lr

        .endasmfunc

;-------------------------------------------------------------------------------
; Enable interrupts - R4 IRQ & FIQ

       .def _enable_interrupt_
       .asmfunc

_enable_interrupt_

        cpsie if
        bx    lr

        .endasmfunc


;-------------------------------------------------------------------------------
; Clear ESM CCM errorss

       .def _esmCcmErrorsClear_
       .asmfunc

_esmCcmErrorsClear_

        stmfd sp!, {r0-r2}
        ldr   r0, ESMSR1_REG    ; load the ESMSR1 status register address
        ldr   r2, ESMSR1_ERR_CLR
        str   r2, [r0]         ; clear the ESMSR1 register

        ldr   r0, ESMSR2_REG    ; load the ESMSR2 status register address
        ldr   r2, ESMSR2_ERR_CLR
        str   r2, [r0]         ; clear the ESMSR2 register

        ldr   r0, ESMSSR2_REG    ; load the ESMSSR2 status register address
        ldr   r2, ESMSSR2_ERR_CLR
        str   r2, [r0]             ; clear the ESMSSR2 register

        ldr   r0, ESMKEY_REG    ; load the ESMKEY register address
        mov   r2, #0x5             ; load R2 with 0x5
        str   r2, [r0]             ; clear the ESMKEY register

        ldr   r0, VIM_INTREQ    ; load the INTREQ register address
        ldr   r2, VIM_INT_CLR
        str   r2, [r0]         ; clear the INTREQ register
        ldr   r0, CCMR4_STAT_REG    ; load the CCMR4 status register address
        ldr   r2, CCMR4_ERR_CLR
        str   r2, [r0]         ; clear the CCMR4 status register
        ldmfd sp!, {r0-r2}
        bx    lr

ESMSR1_REG        .word 0xFFFFF518
ESMSR2_REG        .word 0xFFFFF51C
ESMSR3_REG        .word 0xFFFFF520
ESMKEY_REG        .word 0xFFFFF538
ESMSSR2_REG       .word 0xFFFFF53C
CCMR4_STAT_REG    .word 0xFFFFF600
ERR_CLR_WRD       .word 0xFFFFFFFF
CCMR4_ERR_CLR     .word 0x00010000
ESMSR1_ERR_CLR    .word 0x80000000
ESMSR2_ERR_CLR    .word 0x00000004
ESMSSR2_ERR_CLR   .word 0x00000004
VIM_INT_CLR       .word 0x00000001
VIM_INTREQ        .word 0xFFFFFE20

        .endasmfunc


;-------------------------------------------------------------------------------
; Work Around for Errata CORTEX-R4#66:
;
; Errata Description:
;            Register Corruption During A Load-Multiple Instruction At
;            an Exception Vector
; Workaround:
;            Disable out-of-order completion for divide instructions in
;            Auxiliary Control register

        .def     _errata_CORTEXR4_66_
        .asmfunc

_errata_CORTEXR4_66_

        push {r0}
        mrc p15, #0, r0, c1, c0, #1 ; Read Auxiliary Control register
          orr r0, r0, #0x80           ; Set BIT 7 (Disable out-of-order completion
                                    ; for divide instructions.)
           mcr p15, #0, r0, c1, c0, #1 ; Write Auxiliary Control register
        pop {r0}
        bx lr
    .endasmfunc
;-------------------------------------------------------------------------------
; C++ construct table pointers

    .def    __TI_PINIT_Base, __TI_PINIT_Limit
    .weak   SHT$$INIT_ARRAY$$Base, SHT$$INIT_ARRAY$$Limit

__TI_PINIT_Base  .long SHT$$INIT_ARRAY$$Base
__TI_PINIT_Limit .long SHT$$INIT_ARRAY$$Limit


    
;-------------------------------------------------------------------------------

