diff options
Diffstat (limited to 'src/flash/ocl/at91sam7x/crt.s')
-rw-r--r-- | src/flash/ocl/at91sam7x/crt.s | 448 |
1 files changed, 223 insertions, 225 deletions
diff --git a/src/flash/ocl/at91sam7x/crt.s b/src/flash/ocl/at91sam7x/crt.s index 9ea8a7f..b0bae0d 100644 --- a/src/flash/ocl/at91sam7x/crt.s +++ b/src/flash/ocl/at91sam7x/crt.s @@ -1,225 +1,223 @@ -/****************************************************************************
-* Copyright (c) 2006 by Michael Fischer. All rights reserved.
-*
-* Redistribution and use in source and binary forms, with or without
-* modification, are permitted provided that the following conditions
-* are met:
-*
-* 1. Redistributions of source code must retain the above copyright
-* notice, this list of conditions and the following disclaimer.
-* 2. 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.
-* 3. Neither the name of the author 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.
-*
-****************************************************************************
-*
-* History:
-*
-* 18.12.06 mifi First Version
-* The hardware initialization is based on the startup file
-* crtat91sam7x256_rom.S from NutOS 4.2.1.
-* Therefore partial copyright by egnite Software GmbH.
-****************************************************************************/
-
-/*
- * Some defines for the program status registers
- */
- ARM_MODE_USER = 0x10 /* Normal User Mode */
- ARM_MODE_FIQ = 0x11 /* FIQ Fast Interrupts Mode */
- ARM_MODE_IRQ = 0x12 /* IRQ Standard Interrupts Mode */
- ARM_MODE_SVC = 0x13 /* Supervisor Interrupts Mode */
- ARM_MODE_ABORT = 0x17 /* Abort Processing memory Faults Mode */
- ARM_MODE_UNDEF = 0x1B /* Undefined Instructions Mode */
- ARM_MODE_SYS = 0x1F /* System Running in Priviledged Operating Mode */
- ARM_MODE_MASK = 0x1F
-
- I_BIT = 0x80 /* disable IRQ when I bit is set */
- F_BIT = 0x40 /* disable IRQ when I bit is set */
-
-/*
- * Register Base Address
- */
- AIC_BASE = 0xFFFFF000
- AIC_EOICR_OFF = 0x130
- AIC_IDCR_OFF = 0x124
-
- RSTC_MR = 0xFFFFFD08
- RSTC_KEY = 0xA5000000
- RSTC_URSTEN = 0x00000001
-
- WDT_BASE = 0xFFFFFD40
- WDT_MR_OFF = 0x00000004
- WDT_WDDIS = 0x00008000
-
- MC_BASE = 0xFFFFFF00
- MC_FMR_OFF = 0x00000060
- MC_FWS_1FWS = 0x00480100
-
- .section .vectors,"ax"
- .code 32
-
-/****************************************************************************/
-/* Vector table and reset entry */
-/****************************************************************************/
-_vectors:
- ldr pc, ResetAddr /* Reset */
- ldr pc, UndefAddr /* Undefined instruction */
- ldr pc, SWIAddr /* Software interrupt */
- ldr pc, PAbortAddr /* Prefetch abort */
- ldr pc, DAbortAddr /* Data abort */
- ldr pc, ReservedAddr /* Reserved */
- ldr pc, IRQAddr /* IRQ interrupt */
- ldr pc, FIQAddr /* FIQ interrupt */
-
-
-ResetAddr: .word ResetHandler
-UndefAddr: .word UndefHandler
-SWIAddr: .word SWIHandler
-PAbortAddr: .word PAbortHandler
-DAbortAddr: .word DAbortHandler
-ReservedAddr: .word 0
-IRQAddr: .word IRQHandler
-FIQAddr: .word FIQHandler
-
- .ltorg
-
- .section .init, "ax"
- .code 32
-
- .global ResetHandler
- .global ExitFunction
- .extern main
-/****************************************************************************/
-/* Reset handler */
-/****************************************************************************/
-ResetHandler:
- /*
- * The watchdog is enabled after processor reset. Disable it.
- */
- ldr r1, =WDT_BASE
- ldr r0, =WDT_WDDIS
- str r0, [r1, #WDT_MR_OFF]
-
-
- /*
- * Enable user reset: assertion length programmed to 1ms
- */
- ldr r0, =(RSTC_KEY | RSTC_URSTEN | (4 << 8))
- ldr r1, =RSTC_MR
- str r0, [r1, #0]
-
-
- /*
- * Use 2 cycles for flash access.
- */
- ldr r1, =MC_BASE
- ldr r0, =MC_FWS_1FWS
- str r0, [r1, #MC_FMR_OFF]
-
-
- /*
- * Disable all interrupts. Useful for debugging w/o target reset.
- */
- ldr r1, =AIC_BASE
- mvn r0, #0
- str r0, [r1, #AIC_EOICR_OFF]
- str r0, [r1, #AIC_IDCR_OFF]
-
-
- /*
- * Setup a stack for each mode
- */
- msr CPSR_c, #ARM_MODE_UNDEF | I_BIT | F_BIT /* Undefined Instruction Mode */
- ldr sp, =__stack_und_end
-
- msr CPSR_c, #ARM_MODE_ABORT | I_BIT | F_BIT /* Abort Mode */
- ldr sp, =__stack_abt_end
-
- msr CPSR_c, #ARM_MODE_FIQ | I_BIT | F_BIT /* FIQ Mode */
- ldr sp, =__stack_fiq_end
-
- msr CPSR_c, #ARM_MODE_IRQ | I_BIT | F_BIT /* IRQ Mode */
- ldr sp, =__stack_irq_end
-
- msr CPSR_c, #ARM_MODE_SVC | I_BIT | F_BIT /* Supervisor Mode */
- ldr sp, =__stack_svc_end
-
-
- /*
- * Clear .bss section
- */
- ldr r1, =__bss_start
- ldr r2, =__bss_end
- ldr r3, =0
-bss_clear_loop:
- cmp r1, r2
- strne r3, [r1], #+4
- bne bss_clear_loop
-
-
- /*
- * Jump to main
- */
- mrs r0, cpsr
- bic r0, r0, #I_BIT | F_BIT /* Enable FIQ and IRQ interrupt */
- msr cpsr, r0
-
- mov r0, #0 /* No arguments */
- mov r1, #0 /* No arguments */
- ldr r2, =main
- mov lr, pc
- bx r2 /* And jump... */
-
-ExitFunction:
- nop
- nop
- nop
- b ExitFunction
-
-
-/****************************************************************************/
-/* Default interrupt handler */
-/****************************************************************************/
-
-UndefHandler:
- b UndefHandler
-
-SWIHandler:
- b SWIHandler
-
-PAbortHandler:
- b PAbortHandler
-
-DAbortHandler:
- b DAbortHandler
-
-IRQHandler:
- b IRQHandler
-
-FIQHandler:
- b FIQHandler
-
- .weak ExitFunction
- .weak UndefHandler, PAbortHandler, DAbortHandler
- .weak IRQHandler, FIQHandler
-
- .ltorg
-/*** EOF ***/
-
-
Index: src/flash/ocl/at91sam7x/dcc.c
+/**************************************************************************** +* Copyright (c) 2006 by Michael Fischer. All rights reserved. +* +* Redistribution and use in source and binary forms, with or without +* modification, are permitted provided that the following conditions +* are met: +* +* 1. Redistributions of source code must retain the above copyright +* notice, this list of conditions and the following disclaimer. +* 2. 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. +* 3. Neither the name of the author 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. +* +**************************************************************************** +* +* History: +* +* 18.12.06 mifi First Version +* The hardware initialization is based on the startup file +* crtat91sam7x256_rom.S from NutOS 4.2.1. +* Therefore partial copyright by egnite Software GmbH. +****************************************************************************/ + +/* + * Some defines for the program status registers + */ + ARM_MODE_USER = 0x10 /* Normal User Mode */ + ARM_MODE_FIQ = 0x11 /* FIQ Fast Interrupts Mode */ + ARM_MODE_IRQ = 0x12 /* IRQ Standard Interrupts Mode */ + ARM_MODE_SVC = 0x13 /* Supervisor Interrupts Mode */ + ARM_MODE_ABORT = 0x17 /* Abort Processing memory Faults Mode */ + ARM_MODE_UNDEF = 0x1B /* Undefined Instructions Mode */ + ARM_MODE_SYS = 0x1F /* System Running in Priviledged Operating Mode */ + ARM_MODE_MASK = 0x1F + + I_BIT = 0x80 /* disable IRQ when I bit is set */ + F_BIT = 0x40 /* disable IRQ when I bit is set */ + +/* + * Register Base Address + */ + AIC_BASE = 0xFFFFF000 + AIC_EOICR_OFF = 0x130 + AIC_IDCR_OFF = 0x124 + + RSTC_MR = 0xFFFFFD08 + RSTC_KEY = 0xA5000000 + RSTC_URSTEN = 0x00000001 + + WDT_BASE = 0xFFFFFD40 + WDT_MR_OFF = 0x00000004 + WDT_WDDIS = 0x00008000 + + MC_BASE = 0xFFFFFF00 + MC_FMR_OFF = 0x00000060 + MC_FWS_1FWS = 0x00480100 + + .section .vectors,"ax" + .code 32 + +/****************************************************************************/ +/* Vector table and reset entry */ +/****************************************************************************/ +_vectors: + ldr pc, ResetAddr /* Reset */ + ldr pc, UndefAddr /* Undefined instruction */ + ldr pc, SWIAddr /* Software interrupt */ + ldr pc, PAbortAddr /* Prefetch abort */ + ldr pc, DAbortAddr /* Data abort */ + ldr pc, ReservedAddr /* Reserved */ + ldr pc, IRQAddr /* IRQ interrupt */ + ldr pc, FIQAddr /* FIQ interrupt */ + + +ResetAddr: .word ResetHandler +UndefAddr: .word UndefHandler +SWIAddr: .word SWIHandler +PAbortAddr: .word PAbortHandler +DAbortAddr: .word DAbortHandler +ReservedAddr: .word 0 +IRQAddr: .word IRQHandler +FIQAddr: .word FIQHandler + + .ltorg + + .section .init, "ax" + .code 32 + + .global ResetHandler + .global ExitFunction + .extern main +/****************************************************************************/ +/* Reset handler */ +/****************************************************************************/ +ResetHandler: + /* + * The watchdog is enabled after processor reset. Disable it. + */ + ldr r1, =WDT_BASE + ldr r0, =WDT_WDDIS + str r0, [r1, #WDT_MR_OFF] + + + /* + * Enable user reset: assertion length programmed to 1ms + */ + ldr r0, =(RSTC_KEY | RSTC_URSTEN | (4 << 8)) + ldr r1, =RSTC_MR + str r0, [r1, #0] + + + /* + * Use 2 cycles for flash access. + */ + ldr r1, =MC_BASE + ldr r0, =MC_FWS_1FWS + str r0, [r1, #MC_FMR_OFF] + + + /* + * Disable all interrupts. Useful for debugging w/o target reset. + */ + ldr r1, =AIC_BASE + mvn r0, #0 + str r0, [r1, #AIC_EOICR_OFF] + str r0, [r1, #AIC_IDCR_OFF] + + + /* + * Setup a stack for each mode + */ + msr CPSR_c, #ARM_MODE_UNDEF | I_BIT | F_BIT /* Undefined Instruction Mode */ + ldr sp, =__stack_und_end + + msr CPSR_c, #ARM_MODE_ABORT | I_BIT | F_BIT /* Abort Mode */ + ldr sp, =__stack_abt_end + + msr CPSR_c, #ARM_MODE_FIQ | I_BIT | F_BIT /* FIQ Mode */ + ldr sp, =__stack_fiq_end + + msr CPSR_c, #ARM_MODE_IRQ | I_BIT | F_BIT /* IRQ Mode */ + ldr sp, =__stack_irq_end + + msr CPSR_c, #ARM_MODE_SVC | I_BIT | F_BIT /* Supervisor Mode */ + ldr sp, =__stack_svc_end + + + /* + * Clear .bss section + */ + ldr r1, =__bss_start + ldr r2, =__bss_end + ldr r3, =0 +bss_clear_loop: + cmp r1, r2 + strne r3, [r1], #+4 + bne bss_clear_loop + + + /* + * Jump to main + */ + mrs r0, cpsr + bic r0, r0, #I_BIT | F_BIT /* Enable FIQ and IRQ interrupt */ + msr cpsr, r0 + + mov r0, #0 /* No arguments */ + mov r1, #0 /* No arguments */ + ldr r2, =main + mov lr, pc + bx r2 /* And jump... */ + +ExitFunction: + nop + nop + nop + b ExitFunction + + +/****************************************************************************/ +/* Default interrupt handler */ +/****************************************************************************/ + +UndefHandler: + b UndefHandler + +SWIHandler: + b SWIHandler + +PAbortHandler: + b PAbortHandler + +DAbortHandler: + b DAbortHandler + +IRQHandler: + b IRQHandler + +FIQHandler: + b FIQHandler + + .weak ExitFunction + .weak UndefHandler, PAbortHandler, DAbortHandler + .weak IRQHandler, FIQHandler + + .ltorg +/*** EOF ***/ |