977169ea7a
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@10128 a1c6a512-1295-4272-9138-f99709370657
911 lines
22 KiB
ArmAsm
911 lines
22 KiB
ArmAsm
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by Linus Nielsen Feltzing
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "cpu.h"
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#if defined(CPU_ARM)
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.section .init.text,"ax",%progbits
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#else
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.section .init.text,"ax",@progbits
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#endif
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.global start
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start:
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#if defined(CPU_ARM)
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/* iPod bootloader and startup code based on startup.s from the iPodLinux loader
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*
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* Copyright (c) 2003, Daniel Palffy (dpalffy (at) rainstorm.org)
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* Copyright (c) 2005, Bernard Leach <leachbj@bouncycastle.org>
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*
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*/
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msr cpsr_c, #0xd3 /* enter supervisor mode, disable IRQ */
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#ifndef BOOTLOADER
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#if CONFIG_CPU == PP5002 || CONFIG_CPU == PP5020
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b pad_skip
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.space 50*4 /* (more than enough) space for exception vectors */
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pad_skip:
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/* We need to remap memory from wherever SDRAM is mapped natively, to
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base address 0, so we can put our exception vectors there. We don't
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want to do this remapping while executing from SDRAM, so we copy the
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remapping code to IRAM, then execute from there. Hence, the following
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code is compiled for address 0, but is currently executing at either
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0x28000000 or 0x10000000, depending on chipset version. Do not use any
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absolute addresses until remapping has been done. */
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ldr r1, =0x40000000
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ldr r2, =remap_start
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ldr r3, =remap_end
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and r5, pc, #0xff000000 /* adjust for execute address */
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orr r2, r2, r5
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orr r3, r3, r5
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/* copy the code to 0x40000000 */
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1:
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ldr r4, [r2], #4
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str r4, [r1], #4
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cmp r2, r3
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ble 1b
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ldr r3, =0x3f84 /* r3 and r1 values here are magic, don't touch */
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orr r3, r3, r5 /* adjust for execute address */
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ldr r2, =0xf000f014
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mov r1, #0x3a00
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ldr r0, =0xf000f010
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mov pc, #0x40000000
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remap_start:
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str r1, [r0]
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str r3, [r2]
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ldr r0, L_post_remap
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mov pc, r0
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L_post_remap: .word remap_end
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remap_end:
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#elif CONFIG_CPU == PNX0101
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#ifndef DEBUG
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ldr r0, =0x80105000
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mov r1, #1
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str r1, [r0, #4]
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mov r1, #0
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str r1, [r0, #4]
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1: ldr r1, [r0]
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cmp r1, #0
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bne 1b
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mov r1, #0x74
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str r1, [r0, #8]
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mov r1, #2
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str r1, [r0, #0x18]
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mov r1, #0x120
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str r1, [r0, #0x30]
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mov r1, #6
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str r1, [r0, #4]
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ldr r0, =1f
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mov r15, r0
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1:
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#endif /* !DEBUG */
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#endif /* chipset specific */
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#ifndef DEBUG
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/* Copy exception handler code to address 0 */
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ldr r2, =_vectorsstart
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ldr r3, =_vectorsend
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ldr r4, =_vectorscopy
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1:
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cmp r3, r2
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ldrhi r5, [r4], #4
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strhi r5, [r2], #4
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bhi 1b
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#else
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ldr r1, =vectors
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ldr r0, =irq_handler
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str r0, [r1, #24]
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ldr r0, =fiq_handler
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str r0, [r1, #28]
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#endif
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#ifndef STUB
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/* Zero out IBSS */
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ldr r2, =_iedata
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ldr r3, =_iend
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mov r4, #0
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1:
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cmp r3, r2
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strhi r4, [r2], #4
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bhi 1b
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/* Copy the IRAM */
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ldr r2, =_iramcopy
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ldr r3, =_iramstart
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ldr r4, =_iramend
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1:
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cmp r4, r3
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ldrhi r5, [r2], #4
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strhi r5, [r3], #4
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bhi 1b
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#endif /* !STUB */
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#endif /* !BOOTLOADER */
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/* Initialise bss section to zero */
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ldr r2, =_edata
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ldr r3, =_end
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mov r4, #0
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1:
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cmp r3, r2
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strhi r4, [r2], #4
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bhi 1b
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/* Set up some stack and munge it with 0xdeadbeef */
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ldr sp, =stackend
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mov r3, sp
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ldr r2, =stackbegin
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ldr r4, =0xdeadbeef
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1:
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cmp r3, r2
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strhi r4, [r2], #4
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bhi 1b
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#ifdef BOOTLOADER
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#if CONFIG_CPU == PP5002 || CONFIG_CPU == PP5020
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.equ PP5002_PROC_ID, 0xc4000000
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.equ PP5002_COP_CTRL, 0xcf004058
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.equ PP5020_PROC_ID, 0x60000000
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.equ PP5020_COP_CTRL, 0x60007004
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/* TODO: the high part of the address is probably dependent on CONFIG_CPU.
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Since we tend to use ifdefs for each chipset target
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anyway, we might as well just hardcode it here.
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*/
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/* get the high part of our execute address */
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ldr r0, =0xff000000
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and r8, pc, r0 @ r8 is used later
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#if CONFIG_CPU==PP5002
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mov r0, #PP5002_PROC_ID
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#else
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mov r0, #PP5020_PROC_ID
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#endif
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ldr r0, [r0]
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and r0, r0, #0xff
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cmp r0, #0x55
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beq 1f
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/* put us (co-processor) to sleep */
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#if CONFIG_CPU==PP5002
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ldr r4, =PP5002_COP_CTRL
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mov r3, #0xca
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#else
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ldr r4, =PP5020_COP_CTRL
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mov r3, #0x80000000
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#endif
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str r3, [r4]
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ldr pc, =cop_wake_start
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cop_wake_start:
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/* jump the COP to startup */
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ldr r0, =startup_loc
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ldr pc, [r0]
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1:
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/* get the high part of our execute address */
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ldr r2, =0xffffff00
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and r4, pc, r2
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/* Copy bootloader to safe area - 0x40000000 */
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mov r5, #0x40000000
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ldr r6, = _dataend
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sub r0, r6, r5 /* length of loader */
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add r0, r4, r0 /* r0 points to start of loader */
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1:
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cmp r5, r6
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ldrcc r2, [r4], #4
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strcc r2, [r5], #4
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bcc 1b
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ldr pc, =start_loc /* jump to the relocated start_loc: */
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start_loc:
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/* execute the loader - this will load an image to 0x10000000 */
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bl main
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/* The loader only returns if it is loading the Apple firmware or Linux -
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the following code isn't executed when starting Rockbox */
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/* save the startup address for the COP */
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ldr r1, =startup_loc
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str r0, [r1]
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#if CONFIG_CPU==PP5002
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/* make sure COP is sleeping */
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ldr r4, =0xcf004050
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1:
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ldr r3, [r4]
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ands r3, r3, #0x4000
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beq 1b
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/* wake up COP */
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ldr r4, =PP5002_COP_CTRL
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mov r3, #0xce
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strh r3, [r4]
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#else
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/* make sure COP is sleeping */
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ldr r4, =PP5020_COP_CTRL
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1:
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ldr r3, [r4]
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ands r3, r3, #0x80000000
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beq 1b
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/* wake up COP */
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@ldr r4, =PP5020_COP_CTRL
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mov r3, #0x0
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str r3, [r4]
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#endif
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/* jump to start location */
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mov pc, r0
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startup_loc:
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.word 0x0
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.align 8 /* starts at 0x100 */
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.global boot_table
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boot_table:
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/* here comes the boot table, don't move its offset */
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.space 400
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#endif /* PP specific */
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/* Code for ARM bootloader targets other than iPod go here */
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#else /* BOOTLOADER */
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/* Set up stack for IRQ mode */
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msr cpsr_c, #0xd2
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ldr sp, =irq_stack
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/* Set up stack for FIQ mode */
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msr cpsr_c, #0xd1
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ldr sp, =fiq_stack
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#if CONFIG_CPU == PP5020 || CONFIG_CPU == PP5002
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/* We'll load the banked FIQ mode registers with useful values here.
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These values will be used in the FIQ handler in pcm_playback.c */
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ldr r12, =0x70002800 /* IISCONFIG */
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ldr r11, =p
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#endif
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/* Let abort and undefined modes use IRQ stack */
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msr cpsr_c, #0xd7
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ldr sp, =irq_stack
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msr cpsr_c, #0xdb
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ldr sp, =irq_stack
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/* Switch to supervisor mode */
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msr cpsr_c, #0xd3
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ldr sp, =stackend
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bl main
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/* main() should never return */
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/* Exception handlers. Will be copied to address 0 after memory remapping */
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.section .vectors,"aw"
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ldr pc, [pc, #24]
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ldr pc, [pc, #24]
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ldr pc, [pc, #24]
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ldr pc, [pc, #24]
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ldr pc, [pc, #24]
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ldr pc, [pc, #24]
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ldr pc, [pc, #24]
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ldr pc, [pc, #24]
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/* Exception vectors */
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.global vectors
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vectors:
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.word start
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.word undef_instr_handler
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.word software_int_handler
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.word prefetch_abort_handler
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.word data_abort_handler
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.word reserved_handler
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.word irq_handler
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.word fiq_handler
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.text
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#ifndef STUB
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.global irq
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.global fiq
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.global UIE
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#endif
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/* All illegal exceptions call into UIE with exception address as first
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parameter. This is calculated differently depending on which exception
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we're in. Second parameter is exception number, used for a string lookup
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in UIE.
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*/
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undef_instr_handler:
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mov r0, lr
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mov r1, #0
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b UIE
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/* We run supervisor mode most of the time, and should never see a software
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exception being thrown. Perhaps make it illegal and call UIE?
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*/
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software_int_handler:
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reserved_handler:
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movs pc, lr
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prefetch_abort_handler:
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sub r0, lr, #4
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mov r1, #1
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b UIE
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fiq_handler:
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#if CONFIG_CPU == PP5020
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@ Branch straight to FIQ handler in pcm_playback.c. This also handles the
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@ the correct return sequence.
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ldr pc, =fiq
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#else
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stmfd sp!, {r0-r3, r12, lr}
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mov lr, pc
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ldr pc, =fiq
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ldmfd sp!, {r0-r3, r12, lr}
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subs pc, lr, #4
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#endif
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data_abort_handler:
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sub r0, lr, #8
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mov r1, #2
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b UIE
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irq_handler:
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#ifndef STUB
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stmfd sp!, {r0-r3, r12, lr}
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bl irq
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ldmfd sp!, {r0-r3, r12, lr}
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#endif
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subs pc, lr, #4
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#ifdef STUB
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UIE:
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b UIE
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#endif
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/* 256 words of IRQ stack */
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.space 256*4
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irq_stack:
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/* 256 words of FIQ stack */
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.space 256*4
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fiq_stack:
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#endif /* BOOTLOADER */
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#elif CONFIG_CPU == TCC730
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/* Platform: Gmini 120/SP */
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;; disable all interrupts
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clrsr fe
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clrsr ie
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clrsr te
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ld a14, #0x3F0000
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ld r5, 0xA5
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ldb @[a14 + 6], r5 ; disable watchdog
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ld a11, #(_datacopy) ; where the data section is in the flash
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ld a8, #(_datastart) ; destination
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;; copy data section from flash to ram.
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ld a9, #_datasize
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ld r6, e9
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cmp eq, r6, #0
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brf .data_copy_loop
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cmp eq, r9, #0
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brt .data_copy_end
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.data_copy_loop:
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ldc r2, @a11
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ldw @[a8 + 0], r2
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add a11, #0x2
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add a8, #0x2
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sub r9, #0x2
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sbc r6, #0
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cmp ugt, r6, #0
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brt .data_copy_loop
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cmp ugt, r9, #0
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brt .data_copy_loop
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.data_copy_end:
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;; zero out bss
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ld r2, #0
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ld a8, #(_bssstart) ; destination
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ld a9, #_bsssize
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ld r6, e9
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cmp eq, r6, #0
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brf .bss_init_loop
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cmp eq, r9, #0
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brt .bss_init_end
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.bss_init_loop:
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ldw @[a8 + 0], r2
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add a8, #0x2
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sub r9, #0x2
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sbc r6, #0
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cmp ugt, r6, #0
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brt .bss_init_loop
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cmp ugt, r9, #0
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brt .bss_init_loop
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.bss_init_end:
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;; set stack pointer
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ld a15, _stackend
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;; go!
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jsr _main
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;; soft reset
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ld a10, #0
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ldc r10, @a10
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jmp a10
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.section .vectors, "ax"
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irq_handler:
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push r0, r1
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push r2, r3
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push r4, r5
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push r6, r7
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push a8, a9
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push a10, a11
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push a12, a13
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push a14
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ld a13, #0x3f0000
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ldb r0, @[a13 + 0x26]
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add r0, r0
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ld a10, #_interrupt_vector
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ldw a13, @[a10 + r0]
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jsr a13
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pop a14
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pop a13, a12
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pop a11, a10
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pop a9, a8
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pop r7, r6
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pop r5, r4
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pop r3, r2
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pop r1, r0
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ret_irq
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#elif defined(CPU_COLDFIRE)
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move.w #0x2700,%sr
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move.l #vectors,%d0
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movec.l %d0,%vbr
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move.l #MBAR+1,%d0
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movec.l %d0,%mbar
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move.l #MBAR2+1,%d0
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movec.l %d0,%mbar2
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lea MBAR,%a0
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lea MBAR2,%a1
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clr.l (0x180,%a1) /* PLLCR = 0 */
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/* 64K DMA-capable SRAM at 0x10000000
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DMA is enabled and has priority in both banks
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All types of accesses are allowed
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(We might want to restrict that to save power) */
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move.l #0x10000e01,%d0
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movec.l %d0,%rambar1
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/* 32K Non-DMA SRAM at 0x10010000
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All types of accesses are allowed
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(We might want to restrict that to save power) */
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move.l #0x10010001,%d0
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movec.l %d0,%rambar0
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/* Chip select 0 - Flash ROM */
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moveq.l #0x00,%d0 /* CSAR0 - Base = 0x00000000 */
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move.l %d0,(0x080,%a0)
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move.l #FLASH_SIZE-0x10000+1,%d0 /* CSMR0 - All access */
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move.l %d0,(0x084,%a0)
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move.l #0x00000180,%d0 /* CSCR0 - no wait states, 16 bits, no bursts */
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move.l %d0,(0x088,%a0)
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/* Chip select 1 - LCD controller */
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move.l #0xf0000000,%d0 /* CSAR1 - Base = 0xf0000000 */
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move.l %d0,(0x08c,%a0)
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moveq.l #0x1,%d0 /* CSMR1 - 64K */
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move.l %d0,(0x090,%a0)
|
|
move.l #0x00000180,%d0 /* CSCR1 - no wait states, 16 bits, no bursts */
|
|
move.l %d0,(0x094,%a0)
|
|
|
|
/* Chip select 2 - ATA controller */
|
|
move.l #0x20000000,%d0 /* CSAR2 - Base = 0x20000000 */
|
|
move.l %d0,(0x098,%a0)
|
|
move.l #0x000f0001,%d0 /* CSMR2 - 64K, Only data access */
|
|
move.l %d0,(0x09c,%a0)
|
|
move.l #0x00000080,%d0 /* CSCR2 - no wait states, 16 bits, no bursts */
|
|
move.l %d0,(0x0a0,%a0) /* NOTE: I'm not sure about the wait states.
|
|
We have to be careful with the access times,
|
|
since IORDY isn't connected to the HDD. */
|
|
|
|
#if CONFIG_USBOTG == USBOTG_ISP1362
|
|
/* Chip select 3 - USBOTG controller */
|
|
move.l #0xc0000000,%d0 /* CSAR3 - Base = 0xc0000000 */
|
|
move.l %d0,(0x0a4,%a0)
|
|
moveq.l #0x1,%d0 /* CSMR3 - 64K */
|
|
move.l %d0,(0x0a8,%a0)
|
|
move.l #0x00000180,%d0 /* CSCR3 - no wait states, 16 bits, no bursts */
|
|
move.l %d0,(0x0ac,%a0)
|
|
#endif
|
|
|
|
#ifdef BOOTLOADER
|
|
/* The cookie is not reset. This must mean that the boot loader
|
|
has crashed. Let's start the original firmware immediately. */
|
|
lea 0x10017ffc,%a2
|
|
move.l (%a2),%d0
|
|
move.l #0xc0015a17,%d1
|
|
cmp.l %d0,%d1
|
|
bne.b .nocookie
|
|
/* Clear the cookie again */
|
|
clr.l (%a2)
|
|
jmp 8
|
|
|
|
.nocookie:
|
|
/* Set the cookie */
|
|
move.l %d1,(%a2)
|
|
|
|
/* Set up the DRAM controller. The refresh is based on the 11.2896MHz
|
|
clock (5.6448MHz bus frequency). We haven't yet started the PLL */
|
|
#if MEM < 32
|
|
move.w #0x8004,%d0 /* DCR - Synchronous, 80 cycle refresh */
|
|
#else
|
|
move.w #0x8001,%d0 /* DCR - Synchronous, 32 cycle refresh */
|
|
#endif
|
|
move.w %d0,(0x100,%a0)
|
|
|
|
/* Note on 32Mbyte models:
|
|
We place the SDRAM on an 0x1000000 (16M) offset because
|
|
the 5249 BGA chip has a fault which disables the use of A24. The
|
|
suggested workaround by FreeScale is to offset the base address by
|
|
half the DRAM size and increase the mask to the double.
|
|
In our case this means that we set the base address 16M ahead and
|
|
use a 64M mask.
|
|
*/
|
|
#if MEM < 32
|
|
move.l #0x31002324,%d0 /* DACR0 - Base 0x31000000, Banks on 21 and up,
|
|
CAS latency 1, Page mode, No refresh yet */
|
|
move.l %d0,(0x108,%a0)
|
|
move.l #0x00fc0001,%d0 /* Size: 16M */
|
|
move.l %d0,(0x10c,%a0) /* DMR0 - 32Mb */
|
|
#else
|
|
move.l #0x31002524,%d0 /* DACR0 - Base 0x31000000, Banks on 23 and up,
|
|
CAS latency 1, Page mode, No refresh yet */
|
|
move.l %d0,(0x108,%a0)
|
|
move.l #0x03fc0001,%d0 /* Size: 64M because of workaround above */
|
|
move.l %d0,(0x10c,%a0) /* DMR0 - 32Mb */
|
|
#endif
|
|
|
|
/* Precharge */
|
|
moveq.l #8,%d0
|
|
or.l %d0,(0x108,%a0) /* DACR0[IP] = 1, next access will issue a
|
|
Precharge command */
|
|
move.l #0xabcd1234,%d0
|
|
move.l %d0,0x31000000 /* Issue precharge command */
|
|
|
|
move.l #0x8000,%d0
|
|
or.l %d0,(0x108,%a0) /* Enable refresh */
|
|
|
|
/* Let it refresh */
|
|
move.l #500,%d0
|
|
.delayloop:
|
|
subq.l #1,%d0
|
|
bne.b .delayloop
|
|
|
|
/* Mode Register init */
|
|
moveq.l #0x40,%d0 /* DACR0[IMRS] = 1, next access will set the
|
|
Mode Register */
|
|
or.l %d0,(0x108,%a0)
|
|
|
|
move.l #0xabcd1234,%d0
|
|
move.l %d0,0x31000800 /* A12=1 means CASL=1 (a0 is not connected) */
|
|
|
|
/* DACR0[IMRS] gets deactivated by the SDRAM controller */
|
|
#endif /* BOOTLOADER */
|
|
|
|
/* Invalicate cache */
|
|
move.l #0x01000000,%d0
|
|
movec.l %d0,%cacr
|
|
|
|
/* Enable cache, default=non-cacheable,no buffered writes */
|
|
move.l #0x80000000,%d0
|
|
movec.l %d0,%cacr
|
|
|
|
/* Cache enabled in SDRAM only, buffered writes enabled */
|
|
move.l #0x3103c020,%d0
|
|
movec.l %d0,%acr0
|
|
moveq.l #0,%d0
|
|
movec.l %d0,%acr1
|
|
|
|
#ifndef BOOTLOADER
|
|
/* zero out .ibss */
|
|
lea _iedata,%a2
|
|
lea _iend,%a4
|
|
bra.b .iedatastart
|
|
.iedataloop:
|
|
clr.l (%a2)+
|
|
.iedatastart:
|
|
cmp.l %a2,%a4
|
|
bhi.b .iedataloop
|
|
|
|
/* copy the .iram section */
|
|
lea _iramcopy,%a2
|
|
lea _iramstart,%a3
|
|
lea _iramend,%a4
|
|
bra.b .iramstart
|
|
.iramloop:
|
|
move.l (%a2)+,(%a3)+
|
|
.iramstart:
|
|
cmp.l %a3,%a4
|
|
bhi.b .iramloop
|
|
#endif /* !BOOTLOADER */
|
|
|
|
#ifdef IRIVER_H300_SERIES
|
|
/* Set KEEP_ACT before doing the lengthy copy and zero-fill operations */
|
|
move.l #0x00080000,%d0
|
|
or.l %d0,(0xb4,%a1)
|
|
or.l %d0,(0xb8,%a1)
|
|
or.l %d0,(0xbc,%a1)
|
|
#endif
|
|
|
|
/* zero out bss */
|
|
lea _edata,%a2
|
|
lea _end,%a4
|
|
bra.b .edatastart
|
|
.edataloop:
|
|
clr.l (%a2)+
|
|
.edatastart:
|
|
cmp.l %a2,%a4
|
|
bhi.b .edataloop
|
|
|
|
/* copy the .data section */
|
|
lea _datacopy,%a2
|
|
lea _datastart,%a3
|
|
cmp.l %a2,%a3
|
|
beq.b .nodatacopy /* Don't copy if src and dest are equal */
|
|
lea _dataend,%a4
|
|
bra.b .datastart
|
|
.dataloop:
|
|
move.l (%a2)+,(%a3)+
|
|
.datastart:
|
|
cmp.l %a3,%a4
|
|
bhi.b .dataloop
|
|
.nodatacopy:
|
|
|
|
/* Munge the main stack */
|
|
lea stackbegin,%a2
|
|
lea stackend,%a4
|
|
move.l %a4,%sp
|
|
move.l #0xdeadbeef,%d0
|
|
.mungeloop:
|
|
move.l %d0,(%a2)+
|
|
cmp.l %a2,%a4
|
|
bhi.b .mungeloop
|
|
|
|
jsr main
|
|
.hoo:
|
|
bra.b .hoo
|
|
|
|
.section .resetvectors
|
|
vectors:
|
|
.long stackend
|
|
.long start
|
|
#else
|
|
/* Platform: Archos Jukebox */
|
|
|
|
mov.l .vbr_k,r1
|
|
#ifdef DEBUG
|
|
/* If we have built our code to be loaded via the standalone GDB
|
|
* stub, we will have out VBR at some other location than 0x9000000.
|
|
* We must copy the trap vectors for the GDB stub to our vector table. */
|
|
mov.l .orig_vbr_k,r2
|
|
|
|
/* Move the invalid instruction vector (4) */
|
|
mov #4,r0
|
|
shll2 r0
|
|
mov.l @(r0,r2),r3
|
|
mov.l r3,@(r0,r1)
|
|
|
|
/* Move the invalid slot vector (6) */
|
|
mov #6,r0
|
|
shll2 r0
|
|
mov.l @(r0,r2),r3
|
|
mov.l r3,@(r0,r1)
|
|
|
|
/* Move the bus error vector (9) */
|
|
mov #9,r0
|
|
shll2 r0
|
|
mov.l @(r0,r2),r3
|
|
mov.l r3,@(r0,r1)
|
|
|
|
/* Move the DMA bus error vector (10) */
|
|
mov #10,r0
|
|
shll2 r0
|
|
mov.l @(r0,r2),r3
|
|
mov.l r3,@(r0,r1)
|
|
|
|
/* Move the NMI vector as well (11) */
|
|
mov #11,r0
|
|
shll2 r0
|
|
mov.l @(r0,r2),r3
|
|
mov.l r3,@(r0,r1)
|
|
|
|
/* Move the UserBreak vector as well (12) */
|
|
mov #12,r0
|
|
shll2 r0
|
|
mov.l @(r0,r2),r3
|
|
mov.l r3,@(r0,r1)
|
|
|
|
/* Move the breakpoint trap vector (32) */
|
|
mov #32,r0
|
|
shll2 r0
|
|
mov.l @(r0,r2),r3
|
|
mov.l r3,@(r0,r1)
|
|
|
|
/* Move the IO trap vector (33) */
|
|
mov #33,r0
|
|
shll2 r0
|
|
mov.l @(r0,r2),r3
|
|
mov.l r3,@(r0,r1)
|
|
|
|
/* Move the serial Rx interrupt vector (105) */
|
|
mov #105,r0
|
|
shll2 r0
|
|
mov.l @(r0,r2),r3
|
|
mov.l r3,@(r0,r1)
|
|
|
|
/* Move the single step trap vector (127) */
|
|
mov #127,r0
|
|
shll2 r0
|
|
mov.l @(r0,r2),r3
|
|
mov.l r3,@(r0,r1)
|
|
#endif /* DEBUG */
|
|
ldc r1,vbr
|
|
|
|
mov #0,r0
|
|
ldc r0,gbr
|
|
|
|
/* zero out .ibss */
|
|
mov.l .iedata_k,r0
|
|
mov.l .iend_k,r1
|
|
bra .iedatastart
|
|
mov #0,r2
|
|
.iedataloop: /* backwards is faster and shorter */
|
|
mov.l r2,@-r1
|
|
.iedatastart:
|
|
cmp/hi r0,r1
|
|
bt .iedataloop
|
|
|
|
/* copy the .iram section */
|
|
mov.l .iramcopy_k,r0
|
|
mov.l .iram_k,r1
|
|
mov.l .iramend_k,r2
|
|
/* Note: We cannot put a PC relative load into the delay slot of a 'bra'
|
|
instruction (the offset would be wrong), but there is nothing else to
|
|
do before the loop, so the delay slot would be 'nop'. The cmp / bf
|
|
sequence is the same length, but more efficient. */
|
|
cmp/hi r1,r2
|
|
bf .noiramcopy
|
|
.iramloop:
|
|
mov.l @r0+,r3
|
|
mov.l r3,@r1
|
|
add #4,r1
|
|
cmp/hi r1,r2
|
|
bt .iramloop
|
|
.noiramcopy:
|
|
|
|
/* zero out bss */
|
|
mov.l .edata_k,r0
|
|
mov.l .end_k,r1
|
|
bra .edatastart
|
|
mov #0,r2
|
|
.edataloop: /* backwards is faster and shorter */
|
|
mov.l r2,@-r1
|
|
.edatastart:
|
|
cmp/hi r0,r1
|
|
bt .edataloop
|
|
|
|
/* copy the .data section, for rombased execution */
|
|
mov.l .datacopy_k,r0
|
|
mov.l .data_k,r1
|
|
cmp/eq r0,r1
|
|
bt .nodatacopy /* Don't copy if src and dest are equal */
|
|
mov.l .dataend_k,r2
|
|
cmp/hi r1,r2
|
|
bf .nodatacopy
|
|
.dataloop:
|
|
mov.l @r0+,r3
|
|
mov.l r3,@r1
|
|
add #4,r1
|
|
cmp/hi r1,r2
|
|
bt .dataloop
|
|
.nodatacopy:
|
|
|
|
/* Munge the main thread stack */
|
|
mov.l .stackbegin_k,r0
|
|
mov.l .stackend_k,r1
|
|
mov r1,r15
|
|
mov.l .deadbeef_k,r2
|
|
.mungeloop: /* backwards is faster and shorter */
|
|
mov.l r2,@-r1
|
|
cmp/hi r0,r1
|
|
bt .mungeloop
|
|
|
|
/* call the mainline */
|
|
mov.l .main_k,r0
|
|
jsr @r0
|
|
nop
|
|
.hoo:
|
|
bra .hoo
|
|
nop
|
|
|
|
.align 2
|
|
.vbr_k:
|
|
.long vectors
|
|
#ifdef DEBUG
|
|
.orig_vbr_k:
|
|
.long 0x09000000
|
|
#endif
|
|
.iedata_k:
|
|
.long _iedata
|
|
.iend_k:
|
|
.long _iend
|
|
.iramcopy_k:
|
|
.long _iramcopy
|
|
.iram_k:
|
|
.long _iramstart
|
|
.iramend_k:
|
|
.long _iramend
|
|
.edata_k:
|
|
.long _edata
|
|
.end_k:
|
|
.long _end
|
|
.datacopy_k:
|
|
.long _datacopy
|
|
.data_k:
|
|
.long _datastart
|
|
.dataend_k:
|
|
.long _dataend
|
|
.stackbegin_k:
|
|
.long _stackbegin
|
|
.stackend_k:
|
|
.long _stackend
|
|
.deadbeef_k:
|
|
.long 0xdeadbeef
|
|
.main_k:
|
|
.long _main
|
|
|
|
.section .resetvectors
|
|
vectors:
|
|
.long start
|
|
.long _stackend
|
|
.long start
|
|
.long _stackend
|
|
#endif
|