/****************************************************************************
* arch/avr32/src/at90usb/at90usb_head.S
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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 NuttX 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#define __AVR_ATmega128__
#include <avr/io.h>
#include <avr/sfr_defs.h>
/****************************************************************************
* Pre-processor definitions
****************************************************************************/
/* Stack is allocated just after .bss and before the heap */
#define STACKBASE (_ebss+CONFIG_IDLETHREAD_STACKSIZE-1)
/* The RAMPZ register is only available for CPUs with more than 64Kb of FLASH.
* Only the AT90USB646, 647, 1286, and 1287 are supported by this file.
*
* - Support for the EPLMX instructions is assumed if RAMPZ is present
* - If RAMPZ is not present, support for LPMX is assumed
*/
#if defined(CONFIG_ARCH_CHIP_AT90USB1286) || defined(CONFIG_ARCH_CHIP_AT90USB1286)
# define HAVE_RAMPZ 1
#endif
/****************************************************************************
* External Symbols
****************************************************************************/
.file "up_nommuhead.S"
.global _sbss /* Start of .bss. Defined by ld.script */
.global _ebss /* End of .bss. Defined by ld.script */
.global _sdata /* Start of .data section in RAM */
.global _edata /* End of .data section in RAM */
.global _eronly /* Start of .data section in FLASH */
.global up_lowinit /* Perform low level initialization */
.global os_start /* NuttX entry point */
.global vectortab
.global at90usb_int0 /* External interrupt request 0 */
.global at90usb_int1 /* External interrupt request 1 */
.global at90usb_int2 /* External interrupt request 2 */
.global at90usb_int3 /* External interrupt request 3 */
.global at90usb_int4 /* External interrupt request 4 */
.global at90usb_int5 /* External interrupt request 5 */
.global at90usb_int6 /* External interrupt request 6 */
.global at90usb_int7 /* External interrupt request 7 */
.global at90usb_pcint0 /* PCINT0 Pin Change Interrupt Request 0 */
.global at90usb_usbgen /* USB General USB General Interrupt request */
.global at90usb_usbep /* USB Endpoint/Pipe USB ENdpoint/Pipe Interrupt request */
.global at90usb_wdt /* Watchdog Time-out Interrupt */
.global at90usb_t2compa /* TIMER2 COMPA Timer/Counter2 Compare Match A */
.global at90usb_t2compb /* TIMER2 COMPB Timer/Counter2 Compare Match B */
.global at90usb_t2ovf /* TIMER2 OVF Timer/Counter2 Overflow */
.global at90usb_t1capt /* TIMER1 CAPT Timer/Counter1 Capture Event */
.global at90usb_t1compa /* TIMER1 COMPA Timer/Counter1 Compare Match A */
.global at90usb_t1compb /* TIMER1 COMPB Timer/Counter1 Compare Match B */
.global at90usb_t1compc /* TIMER1 COMPC Timer/Counter1 Compare Match c */
.global at90usb_t1ovf /* TIMER1 OVF Timer/Counter1 Overflow */
.global at90usb_t0compa /* TIMER0 COMPA Timer/Counter0 Compare Match A */
.global at90usb_t0compb /* TIMER0 COMPB Timer/Counter0 Compare Match B */
.global at90usb_t0ovf /* TIMER0 OVF Timer/Counter0 Overflow */
.global at90usb_spi /* STC SPI Serial Transfer Complete */
.global at90usb_u1rx /* USART1 Rx Complete */
.global at90usb_u1dre /* USART1 Data Register Empty */
.global at90usb_u1tx /* USART1 Tx Complete */
.global at90usb_anacomp /* ANALOG COMP Analog Comparator */
.global at90usb_adc /* ADC Conversion Complete */
.global at90usb_ee /* EEPROM Ready */
.global at90usb_t3capt /* TIMER3 CAPT Timer/Counter3 Capture Event */
.global at90usb_t3compa /* TIMER3 COMPA Timer/Counter3 Compare Match A */
.global at90usb_t3compb /* TIMER3 COMPB Timer/Counter3 Compare Match B */
.global at90usb_t3compc /* TIMER3 COMPC Timer/Counter3 Compare Match C */
.global at90usb_t3ovf /* TIMER3 OVF Timer/Counter3 Overflow */
.global at90usb_twi /* TWI Two-wire Serial Interface */
.global at90usb_spmrdy /* Store Program Memory Ready */
/****************************************************************************
* Macros
****************************************************************************/
.macro vector name
jmp \name
.endm
/****************************************************************************
* Vector Table
****************************************************************************/
/* The AT90USB has 38 interrupt vectors including vector 0, the reset
* vector.
*/
.section .vectors, "ax", @progbits
.func vectortab
vectortab:
jmp __start /* 0: Vector 0 is the reset vector */
vector at90usb_int0 /* 1: External interrupt request 0 */
vector at90usb_int1 /* 2: External interrupt request 1 */
vector at90usb_int2 /* 3: External interrupt request 2 */
vector at90usb_int3 /* 4: External interrupt request 3 */
vector at90usb_int4 /* 5: External interrupt request 4 */
vector at90usb_int5 /* 6: External interrupt request 5 */
vector at90usb_int6 /* 7: External interrupt request 6 */
vector at90usb_int7 /* 8: External interrupt request 7 */
vector at90usb_pcint0 /* 9: PCINT0 Pin Change Interrupt Request 0 */
vector at90usb_usbgen /* 10: USB General USB General Interrupt request */
vector at90usb_usbep /* 11: USB Endpoint/Pipe USB ENdpoint/Pipe Interrupt request */
vector at90usb_wdt /* 12: Watchdog Time-out Interrupt */
vector at90usb_t2compa /* 13: TIMER2 COMPA Timer/Counter2 Compare Match A */
vector at90usb_t2compb /* 14: TIMER2 COMPB Timer/Counter2 Compare Match B */
vector at90usb_t2ovf /* 15: TIMER2 OVF Timer/Counter2 Overflow */
vector at90usb_t1capt /* 16: TIMER1 CAPT Timer/Counter1 Capture Event */
vector at90usb_t1compa /* 17: TIMER1 COMPA Timer/Counter1 Compare Match A */
vector at90usb_t1compb /* 18: TIMER1 COMPB Timer/Counter1 Compare Match B */
vector at90usb_t1compc /* 19: TIMER1 COMPC Timer/Counter1 Compare Match c */
vector at90usb_t1ovf /* 20: TIMER1 OVF Timer/Counter1 Overflow */
vector at90usb_t0compa /* 21: TIMER0 COMPA Timer/Counter0 Compare Match A */
vector at90usb_t0compb /* 22: TIMER0 COMPB Timer/Counter0 Compare Match B */
vector at90usb_t0ovf /* 23: TIMER0 OVF Timer/Counter0 Overflow */
vector at90usb_spi /* 24: STC SPI Serial Transfer Complete */
vector at90usb_u1rx /* 25: USART1 Rx Complete */
vector at90usb_u1dre /* 26: USART1 Data Register Empty */
vector at90usb_u1tx /* 27: USART1 Tx Complete */
vector at90usb_anacomp /* 28: ANALOG COMP Analog Comparator */
vector at90usb_adc /* 29: ADC Conversion Complete */
vector at90usb_ee /* 30: EEPROM Ready */
vector at90usb_t3capt /* 31: TIMER3 CAPT Timer/Counter3 Capture Event */
vector at90usb_t3compa /* 32: TIMER3 COMPA Timer/Counter3 Compare Match A */
vector at90usb_t3compb /* 33: TIMER3 COMPB Timer/Counter3 Compare Match B */
vector at90usb_t3compc /* 34: TIMER3 COMPC Timer/Counter3 Compare Match C */
vector at90usb_t3ovf /* 35: TIMER3 OVF Timer/Counter3 Overflow */
vector at90usb_twi /* 36: TWI Two-wire Serial Interface */
vector at90usb_spmrdy /* 37: Store Program Memory Ready */
.endfunc
/****************************************************************************
* Reset Entry Point
****************************************************************************/
.section .init, "ax", @progbits
.func __start
__start:
/* Clear the zero register, clear the status register and initialize the
* IDLE thread stack
*/
clr r1
out _SFR_IO_ADDR(SREG), r1
ldi r28, lo8(STACKBASE)
ldi r29, hi8(STACKBASE)
out _SFR_IO_ADDR(SPH), r29
out _SFR_IO_ADDR(SPL), r28
/* Copy initial global data values from FLASH into RAM */
#ifdef HAVE_RAMPZ
ldi r17, hi8(_edata)
ldi r26, lo8(_sdata)
ldi r27, hi8(_sdata)
ldi r30, lo8(_eronly)
ldi r31, hi8(_eronly)
ldi r16, hh8(_eronly)
out _SFR_IO_ADDR(RAMPZ), r16
rjmp .Lcopystart
.Lcopyloop:
elpm r0, Z+
st X+, r0
.Lcopystart:
cpi r26, lo8(_edata)
cpc r27, r17
brne .Lcopyloop
#else
ldi r17, hi8(_edata)
ldi r26, lo8(_sdata)
ldi r27, hi8(_sdata)
ldi r30, lo8(_eronly)
ldi r31, hi8(_eronly)
rjmp .Lcopystart
.Lcopyloop:
lpm r0, Z+
st X+, r0
.Lcopystart:
cpi r26, lo8(_edata)
cpc r27, r17
brne .Lcopyloop
#endif
/* Clear uninitialized data */
ldi r17, hi8(_ebss)
ldi r26, lo8(_sbss)
ldi r27, hi8(_sbss)
rjmp .Lclearstart
.Lclearloop:
st X+, r1
.Lclearstart:
cpi r26, lo8(_ebss)
cpc r27, r17
brne .Lclearloop
/* Now start NuttX */
call os_start /* Start NuttX */
jmp exit
.endfunc
/****************************************************************************
* Heap Base
****************************************************************************/
/* This global variable is unsigned long g_heapbase and is
* exported from here only because of its coupling to other
* uses of _ebss in this file
*/
.data
.globl g_heapbase
.type g_heapbase, object
g_heapbase:
.word _ebss+CONFIG_IDLETHREAD_STACKSIZE
.size g_heapbase, .-g_heapbase
.end
