/*
 * Copyright 2020-2026 Yuntu Microelectronics Co., Ltd.
 * All rights reserved.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 * 
 * @file RamInit0.S
 * @brief 
 * 
 */


   PRESERVE8
   THUMB
   AREA    |.text|, CODE, READONLY
RamInit0
   EXPORT  RamInit0
_GET_POR
    LDR     R1, =0x4007F000
    LDR     R4, [R1]
    LDR     R3, =0x1
/* R4 store POR result */
    ANDS    R4, R3
_IVT_RAM_start
/* 8bytes align */
    LDR     R1, =0x20000000
    LDR     R2, =(0x20000000+0x400)
    
    SUBS    R2, R2, R1
    SUBS    R2, #1
    BLE     _IVT_RAM_end

    LDR     R0, =0x5A5A5A5A
    LDR     R3, =0x5A5A5A5A

_IVT_RAM_loop
    STM     R1!, {R0,R3}
    SUBS    R2, #8
    BGE      _IVT_RAM_loop

_IVT_RAM_end

    CMP     R4, #0
    BEQ     _POR_end
_POR_start
/* 8bytes align */
    LDR     R1, =0x200077f0
    LDR     R2, =(0x200077f0+16)
    
    SUBS    R2, R2, R1
    SUBS    R2, #1
    BLE     _POR_end

    LDR     R0, =0x5A5A5A5A
    LDR     R3, =0x5A5A5A5A

_POR_loop
    STM     R1!, {R0,R3}
    SUBS    R2, #8
    BGE      _POR_loop

_POR_end

_STACK_start
/* 8bytes align */
    LDR     R1, =0x20007800
    LDR     R2, =(0x20007800+2048)
    
    SUBS    R2, R2, R1
    SUBS    R2, #1
    BLE     _STACK_end

    LDR     R0, =0x5A5A5A5A
    LDR     R3, =0x5A5A5A5A

_STACK_loop
    STM     R1!, {R0,R3}
    SUBS    R2, #8
    BGE      _STACK_loop

_STACK_end

_RAM_start
/* 8bytes align */
    LDR     R1, =0x20000400
    LDR     R2, =(0x20000400+0x73F0)
    
    SUBS    R2, R2, R1
    SUBS    R2, #1
    BLE     _RAM_end

    LDR     R0, =0x5A5A5A5A
    LDR     R3, =0x5A5A5A5A

_RAM_loop
    STM     R1!, {R0,R3}
    SUBS    R2, #8
    BGE      _RAM_loop

_RAM_end

   BX LR
   ALIGN 4
   END