tinySA/os/common/ports/e200/devices/SPC560Dxx/boot.s

/*
    ChibiOS - Copyright (C) 2006..2015 Giovanni Di Sirio.

    This file is part of ChibiOS.

    ChibiOS is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    ChibiOS is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/**
 * @file    SPC560Dxx/boot.s
 * @brief   SPC560Dxx boot-related code.
 *
 * @addtogroup PPC_BOOT
 * @{
 */

#include "boot.h"

#if !defined(__DOXYGEN__)

        /* BAM record.*/
        .section    .boot, "ax"

        .long       0x015A0000
        .long       _reset_address

        .align      2
        .globl      _reset_address
        .type       _reset_address, @function
_reset_address:
#if BOOT_PERFORM_CORE_INIT
        bl          _coreinit
#endif
        bl          _ivinit

#if BOOT_RELOCATE_IN_RAM
        /*
         * Image relocation in RAM.
         */
        lis         r4, __ram_reloc_start__@h
        ori         r4, r4, __ram_reloc_start__@l
        lis         r5, __ram_reloc_dest__@h
        ori         r5, r5, __ram_reloc_dest__@l
        lis         r6, __ram_reloc_end__@h
        ori         r6, r6, __ram_reloc_end__@l
.relloop:
        cmpl        cr0, r4, r6
        bge         cr0, .relend
        lwz         r7, 0(r4)
        addi        r4, r4, 4
        stw         r7, 0(r5)
        addi        r5, r5, 4
        b           .relloop
.relend:
        lis         r3, _boot_address@h
        ori         r3, r3, _boot_address@l
        mtctr       r3
        bctrl
#else
        b           _boot_address
#endif

#if BOOT_PERFORM_CORE_INIT
        .align      2
_coreinit:
        /*
         * RAM clearing, this device requires a write to all RAM location in
         * order to initialize the ECC detection hardware, this is going to
         * slow down the startup but there is no way around.
         */
        xor         r0, r0, r0
        xor         r1, r1, r1
        xor         r2, r2, r2
        xor         r3, r3, r3
        xor         r4, r4, r4
        xor         r5, r5, r5
        xor         r6, r6, r6
        xor         r7, r7, r7
        xor         r8, r8, r8
        xor         r9, r9, r9
        xor         r10, r10, r10
        xor         r11, r11, r11
        xor         r12, r12, r12
        xor         r13, r13, r13
        xor         r14, r14, r14
        xor         r15, r15, r15
        xor         r16, r16, r16
        xor         r17, r17, r17
        xor         r18, r18, r18
        xor         r19, r19, r19
        xor         r20, r20, r20
        xor         r21, r21, r21
        xor         r22, r22, r22
        xor         r23, r23, r23
        xor         r24, r24, r24
        xor         r25, r25, r25
        xor         r26, r26, r26
        xor         r27, r27, r27
        xor         r28, r28, r28
        xor         r29, r29, r29
        xor         r30, r30, r30
        xor         r31, r31, r31
        lis         r4, __ram_start__@h
        ori         r4, r4, __ram_start__@l
        lis         r5, __ram_end__@h
        ori         r5, r5, __ram_end__@l
.cleareccloop:
        cmpl        cr0, r4, r5
        bge         cr0, .cleareccend
        stmw        r16, 0(r4)
        addi        r4, r4, 64
        b           .cleareccloop
.cleareccend:

        /*
         * Branch prediction enabled.
         */
        li          r3, BOOT_BUCSR_DEFAULT
        mtspr       1013, r3       /* BUCSR */

        blr
#endif /* BOOT_PERFORM_CORE_INIT */

        /*
         * Exception vectors initialization.
         */
        .align      2
_ivinit:
        /* MSR initialization.*/
        lis         r3, BOOT_MSR_DEFAULT@h
        ori         r3, r3, BOOT_MSR_DEFAULT@l
        mtMSR       r3

        /* IVPR initialization.*/
        lis         r3, __ivpr_base__@h
        ori         r3, r3, __ivpr_base__@l
        mtIVPR      r3

        blr

        .section    .ivors, "ax"

        .globl      IVORS
IVORS:
        b           _IVOR0
        .align      4
        b           _IVOR1
        .align      4
        b           _IVOR2
        .align      4
        b           _IVOR3
        .align      4
        b           _IVOR4
        .align      4
        b           _IVOR5
        .align      4
        b           _IVOR6
        .align      4
        b           _IVOR7
        .align      4
        b           _IVOR8
        .align      4
        b           _IVOR9
        .align      4
        b           _IVOR10
        .align      4
        b           _IVOR11
        .align      4
        b           _IVOR12
        .align      4
        b           _IVOR13
        .align      4
        b           _IVOR14
        .align      4
        b           _IVOR15

        .section    .handlers, "ax"

        /*
         * Default IVOR handlers.
         */
        .align      2
        .weak       _IVOR0,  _IVOR1,  _IVOR2,  _IVOR3,  _IVOR4,  _IVOR5
        .weak       _IVOR6,  _IVOR7,  _IVOR8,  _IVOR9,  _IVOR10, _IVOR11
        .weak       _IVOR12, _IVOR13, _IVOR14, _IVOR15
        .weak       _unhandled_exception
_IVOR0:
_IVOR1:
_IVOR2:
_IVOR3:
_IVOR5:
_IVOR6:
_IVOR7:
_IVOR8:
_IVOR9:
_IVOR11:
_IVOR12:
_IVOR13:
_IVOR14:
_IVOR15:
_unhandled_exception:
        b           _unhandled_exception

#endif /* !defined(__DOXYGEN__) */

/** @} */