/*---------------------------------------------------------------------------*
  Project:  CtrBrom - library - init
  File:     crt0_app.c

  Copyright 2008 Nintendo.  All rights reserved.

  These coded instructions, statements, and computer programs contain
  proprietary information of Nintendo of America Inc. and/or Nintendo
  Company Ltd., and are protected by Federal copyright law.  They may
  not be disclosed to third parties or copied or duplicated in any form,
  in whole or in part, without the prior written consent of Nintendo.

  $Date::            $
  $Rev$
  $Author$
 *---------------------------------------------------------------------------*/
#include <brom/code32.h>
#include <brom/os.h>

#undef  BROM_TARGET_BROM
#define BROM_TARGET_APP

#define STUPi_HW_DTCM   |Image$$DTCM$$Base|

void    _start(void);

/*---------------------------------------------------------------------------*
  Name:         _start

  Description:  Start up

  Arguments:    None

  Returns:      None.
 *---------------------------------------------------------------------------*/
asm void _start( void )
{
        PRESERVE8

        INASM_EXTERN( STUPi_HW_DTCM )
        INASM_EXTERN( BromSpMain )
        INASM_EXTERN( main )

        //---- initialize stack pointer
        // SVC mode
        mov             r0, #HW_PSR_SVC_MODE | HW_PSR_IRQ_DISABLE | HW_PSR_FIQ_DISABLE
        msr             cpsr_fsxc, r0
        ldr             sp, =HW_BROM_SVC_STACK_END

        // IRQ mode
        mov             r0, #HW_PSR_IRQ_MODE | HW_PSR_IRQ_DISABLE | HW_PSR_FIQ_DISABLE
        msr             cpsr_fsxc, r0
        ldr             r0, =HW_BROM_IRQ_STACK_END
        mov             sp, r0

        // System mode
        mov             r0, #HW_PSR_SYS_MODE | HW_PSR_IRQ_DISABLE | HW_PSR_FIQ_DISABLE
        msr             cpsr_fsxc, r0
        ldr             r0, =HW_BROM_SYS_STACK_END
        mov             sp, r0

        //---- initialize cp15
        bl              i_stupInitCP15

        //---- clear wram
        // DTCM (16KB)
        mov             r0, #0
        ldr             r1, =STUPi_HW_DTCM
        mov             r2, #HW_DTCM_SIZE
        bl              i_stupCpuClear32

        // 64B
        mov             r0, #0
        ldr             r1, =HW_PRV_WRAM_SYSRV
        ldr             r2, =HW_EXCP_VENEER_BUF
        sub             r2, r2, r1
        bl              i_stupCpuClear32

        ldr             r1, =HW_EXCP_VENEER_BUF_END
        ldr             r2, =HW_PRV_WRAM_SYSRV_END
        sub             r2, r2, r1
        bl              i_stupCpuClear32

        //---- lnitialize sections
        bl              stupInitSections

        //---- start (to 16bit code)
        ldr             r1, =BromSpMain
        adr             lr, terminate

        bx              r1

terminate
        b               terminate
}

#include <./crt0_pu.c>
#include <./crt0_misc_sp.c>