Add AT90USB support and AVR vector/startup logic

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3677 42af7a65-404d-4744-a932-0658087f49c3

8 files changed, 1181 insertions, 0 deletions

diff --git a/nuttx/arch/avr/include/at90usb/irq.h b/nuttx/arch/avr/include/at90usb/irq.h
new file mode 100644
index 000000000..6d2b9166c
--- /dev/null
+++ b/nuttx/arch/avr/include/at90usb/irq.h
@@ -0,0 +1,149 @@
+/****************************************************************************
+ * arch/avr/include/avr/at90usb/irq.h
+ *
+ *   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.
+ *
+ ****************************************************************************/
+
+/* This file should never be included directed but, rather, only indirectly
+ * through nuttx/irq.h
+ */
+
+#ifndef __ARCH_AVR_INCLUDE_AT90USB_IRQ_H
+#define __ARCH_AVR_INCLUDE_AT90USB_IRQ_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/irq.h>
+#include <arch/avr/avr.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/* The AT90USB has 38 interrupt vectors including vector 0, the reset
+ * vector.  The remaining 37 are assigned IRQ numbers here:
+ */
+
+#define AT90USB_IRQ_INT0     0  /* 0x0002 External Interrupt Request 0 */
+#define AT90USB_IRQ_INT1     1  /* 0x0004 External Interrupt Request 1 */
+#define AT90USB_IRQ_INT2     2  /* 0x0006 External Interrupt Request 2 */
+#define AT90USB_IRQ_INT3     3  /* 0x0008 External Interrupt Request 3 */
+#define AT90USB_IRQ_INT4     4  /* 0x000a External Interrupt Request 4 */
+#define AT90USB_IRQ_INT5     5  /* 0x000c External Interrupt Request 5 */
+#define AT90USB_IRQ_INT6     6  /* 0x000e External Interrupt Request 6 */
+#define AT90USB_IRQ_INT7     7  /* 0x0010 External Interrupt Request 7 */
+#define AT90USB_IRQ_PCINT0   8  /* 0x0012 PCINT0 Pin Change Interrupt Request 0 */
+#define AT90USB_IRQ_USBGEN   9  /* 0x0014 USB General USB General Interrupt request */
+#define AT90USB_IRQ_USBEP   10  /* 0x0016 USB Endpoint/Pipe USB ENdpoint/Pipe Interrupt request */
+#define AT90USB_IRQ_WDT     11  /* 0x0018 Watchdog Time-out Interrupt */
+#define AT90USB_IRQ_T2COMPA 12  /* 0x001a TIMER2 COMPA Timer/Counter2 Compare Match A */
+#define AT90USB_IRQ_T2COMPB 13  /* 0x001c TIMER2 COMPB Timer/Counter2 Compare Match B */
+#define AT90USB_IRQ_T2OVF   14  /* 0x001e TIMER2 OVF Timer/Counter2 Overflow */
+#define AT90USB_IRQ_T1CAPT  15  /* 0x0020 TIMER1 CAPT Timer/Counter1 Capture Event */
+#define AT90USB_IRQ_T1COMPA 16  /* 0x0022 TIMER1 COMPA Timer/Counter1 Compare Match A */
+#define AT90USB_IRQ_T1COMPB 17  /* 0x0024 TIMER1 COMPB Timer/Counter1 Compare Match B */
+#define AT90USB_IRQ_T1COMPC 18  /* 0x0026 TIMER1 COMPC Timer/Counter1 Compare Match c */
+#define AT90USB_IRQ_T1OVF   19  /* 0x0028 TIMER1 OVF Timer/Counter1 Overflow */
+#define AT90USB_IRQ_T0COMPA 20  /* 0x002a TIMER0 COMPA Timer/Counter0 Compare Match A */
+#define AT90USB_IRQ_T0COMPB 21  /* 0x002c TIMER0 COMPB Timer/Counter0 Compare Match B */
+#define AT90USB_IRQ_T0OVF   22  /* 0x002e TIMER0 OVF Timer/Counter0 Overflow */
+#define AT90USB_IRQ_SPI     23  /* 0x0030 STC SPI Serial Transfer Complete */
+#define AT90USB_IRQ_U1RX    24  /* 0x0032 USART1 Rx Complete */
+#define AT90USB_IRQ_U1DRE   25  /* 0x0034 USART1 Data Register Empty */
+#define AT90USB_IRQ_U1TX    26  /* 0x0036 USART1 Tx Complete */
+#define AT90USB_IRQ_ANACOMP 27  /* 0x0038 ANALOG COMP Analog Comparator */
+#define AT90USB_IRQ_ADC     28  /* 0x003a ADC Conversion Complete */
+#define AT90USB_IRQ_EE      29  /* 0x003c EEPROM Ready */
+#define AT90USB_IRQ_T3CAPT  30  /* 0x003e TIMER3 CAPT Timer/Counter3 Capture Event */
+#define AT90USB_IRQ_T3COMPA 31  /* 0x0034 TIMER3 COMPA Timer/Counter3 Compare Match A */
+#define AT90USB_IRQ_T3COMPB 32  /* 0x0042 TIMER3 COMPB Timer/Counter3 Compare Match B */
+#define AT90USB_IRQ_T3COMPC 33  /* 0x0044 TIMER3 COMPC Timer/Counter3 Compare Match C */
+#define AT90USB_IRQ_T3OVF   34  /* 0x0046 TIMER3 OVF Timer/Counter3 Overflow */
+#define AT90USB_IRQ_TWI     35  /* 0x0048 TWI Two-wire Serial Interface */
+#define AT90USB_IRQ_SPMRDY  36  /* 0x004a Store Program Memory Ready */
+
+#define NR_IRQS             37
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Inline functions
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/* Save the current interrupt enable state & disable all interrupts */
+
+static inline irqstate_t irqsave(void)
+{
+  /* Needs to return the current interrupt state, then disable interrupts */
+#warning "Not implemented"
+  return 0
+}
+
+/* Restore saved interrupt state */
+
+static inline void irqrestore(irqstate_t flags)
+{
+  /* Based on the provided interrupt flags, conditionally enable interrupts */
+#warning "Not implemented"
+}
+#endif /* __ASSEMBLY__ */
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+#endif
+
+#endif /* __ARCH_AVR_INCLUDE_AT90USB_IRQ_H */
+
diff --git a/nuttx/arch/avr/include/atmega/irq.h b/nuttx/arch/avr/include/atmega/irq.h
new file mode 100644
index 000000000..ea5b02060
--- /dev/null
+++ b/nuttx/arch/avr/include/atmega/irq.h
@@ -0,0 +1,146 @@
+/****************************************************************************
+ * arch/avr/include/avr/atmega/irq.h
+ *
+ *   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.
+ *
+ ****************************************************************************/
+
+/* This file should never be included directed but, rather, only indirectly
+ * through nuttx/irq.h
+ */
+
+#ifndef __ARCH_AVR_INCLUDE_ATMEGA_IRQ_H
+#define __ARCH_AVR_INCLUDE_ATMEGA_IRQ_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/irq.h>
+#include <arch/avr/avr.h>
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/* The ATmega128 has 35 interrupt vectors including vector 0, the reset
+ * vector.  The remaining 34 are assigned IRQ numbers here:
+ */
+
+#define ATMEGA_IRQ_INT0     0  /* 0x0002 External Interrupt Request 0 */
+#define ATMEGA_IRQ_INT1     1  /* 0x0004 External Interrupt Request 1 */
+#define ATMEGA_IRQ_INT2     2  /* 0x0006 External Interrupt Request 2 */
+#define ATMEGA_IRQ_INT3     3  /* 0x0008 External Interrupt Request 3 */
+#define ATMEGA_IRQ_INT4     4  /* 0x000a External Interrupt Request 4 */
+#define ATMEGA_IRQ_INT5     5  /* 0x000c External Interrupt Request 5 */
+#define ATMEGA_IRQ_INT6     6  /* 0x000e External Interrupt Request 6 */
+#define ATMEGA_IRQ_INT7     7  /* 0x0010 External Interrupt Request 7 */
+#define ATMEGA_IRQ_T2COMP   8  /* 0x0012 TIMER2 COMP Timer/Counter2 Compare Match */
+#define ATMEGA_IRQ_T2OVF    9  /* 0x0014 TIMER2 OVF Timer/Counter2 Overflow */
+#define ATMEGA_IRQ_T1CAPT  10  /* 0x0016 TIMER1 CAPT Timer/Counter1 Capture Event */
+#define ATMEGA_IRQ_T1COMPA 11  /* 0x0018 TIMER1 COMPA Timer/Counter1 Compare Match A */
+#define ATMEGA_IRQ_T1COMPB 12  /* 0x001a TIMER1 COMPB Timer/Counter1 Compare Match B */
+#define ATMEGA_IRQ_T1OVF   13  /* 0x001c TIMER1 OVF Timer/Counter1 Overflow */
+#define ATMEGA_IRQ_T0COMP  14  /* 0x001e TIMER0 COMP Timer/Counter0 Compare Match */
+#define ATMEGA_IRQ_T0OVF   15  /* 0x0020 TIMER0 OVF Timer/Counter0 Overflow */
+#define ATMEGA_IRQ_SPI     16  /* 0x0022 STC SPI Serial Transfer Complete */
+#define ATMEGA_IRQ_U0RX    17  /* 0x0024 USART0 Rx Complete */
+#define ATMEGA_IRQ_U0DRE   18  /* 0x0026 USART0 Data Register Empty */
+#define ATMEGA_IRQ_U0TX    19  /* 0x0028 USART0 Tx Complete */
+#define ATMEGA_IRQ_ADC     20  /* 0x002a ADC Conversion Complete */
+#define ATMEGA_IRQ_EE      21  /* 0x002c EEPROM Ready */
+#define ATMEGA_IRQ_ANACOMP 22  /* 0x002e ANALOG COMP Analog Comparator */
+#define ATMEGA_IRQ_T1COMPC 23  /* 0x0030 TIMER1 COMPC Timer/Countre1 Compare Match C */
+#define ATMEGA_IRQ_T3CAPT  24  /* 0x0032 TIMER3 CAPT Timer/Counter3 Capture Event */
+#define ATMEGA_IRQ_T3COMPA 25  /* 0x0034 TIMER3 COMPA Timer/Counter3 Compare Match A */
+#define ATMEGA_IRQ_T3COMPB 26  /* 0x0036 TIMER3 COMPB Timer/Counter3 Compare Match B */
+#define ATMEGA_IRQ_T3COMPC 27  /* 0x0038 TIMER3 COMPC Timer/Counter3 Compare Match C */
+#define ATMEGA_IRQ_T3OVF   28  /* 0x003a TIMER3 OVF Timer/Counter3 Overflow */
+#define ATMEGA_IRQ_U1RX    29  /* 0x003c USART1 Rx Complete */
+#define ATMEGA_IRQ_U1DRE   30  /* 0x003e USART1 Data Register Empty */
+#define ATMEGA_IRQ_U1TX    31  /* 0x0040 USART1 Tx Complete */
+#define ATMEGA_IRQ_TWI     32  /* 0x0042 TWI Two-wire Serial Interface */
+#define ATMEGA_IRQ_SPMRDY  33  /* 0x0044 Store Program Memory Ready */
+
+#define NR_IRQS            34
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Inline functions
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/* Save the current interrupt enable state & disable all interrupts */
+
+static inline irqstate_t irqsave(void)
+{
+  /* Needs to return the current interrupt state, then disable interrupts */
+#warning "Not implemented"
+  return 0
+}
+
+/* Restore saved interrupt state */
+
+static inline void irqrestore(irqstate_t flags)
+{
+  /* Based on the provided interrupt flags, conditionally enable interrupts */
+#warning "Not implemented"
+}
+#endif /* __ASSEMBLY__ */
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+#endif
+
+#endif /* __ARCH_AVR_INCLUDE_ATMEGA_IRQ_H */
+
diff --git a/nuttx/arch/avr/src/at90usb/Make.defs b/nuttx/arch/avr/src/at90usb/Make.defs
new file mode 100644
index 000000000..48973c898
--- /dev/null
+++ b/nuttx/arch/avr/src/at90usb/Make.defs
@@ -0,0 +1,64 @@
+############################################################################
+# arch/avr/src/at90usb/Make.defs
+#
+#   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.
+#
+############################################################################
+
+# The start-up, "head", file
+
+HEAD_ASRC	= at90usb_head.S
+
+# Common AVR files
+
+CMN_ASRCS	= up_exceptions.S up_fullcontextrestore.S up_switchcontext.S
+CMN_CSRCS	= up_assert.c up_allocateheap.c up_blocktask.c up_copystate.c \
+		  up_createstack.c up_mdelay.c up_udelay.c up_exit.c up_idle.c \
+		  up_initialize.c up_initialstate.c up_interruptcontext.c \
+		  up_modifyreg8.c up_modifyreg16.c up_modifyreg32.c \
+		  up_releasepending.c up_releasestack.c up_reprioritizertr.c \
+		  up_schedulesigaction.c up_sigdeliver.c up_unblocktask.c \
+		  up_usestack.c up_doirq.c
+
+# Required ATMEGA files
+
+CHIP_ASRCS	=
+CHIP_CSRCS	= at90usb_clkinit.c at90usb_gpio.c at90usb_irq.c \
+		  at90usb_lowconsole.c at90usb_lowinit.c at90usb_serial.c \
+		  at90usb_timerisr.c
+
+# Configuration-dependent ATMEGA files
+
+ifeq ($(CONFIG_AVR_GPIOIRQ),y)
+CHIP_CSRCS	+= at90usb_gpioirq.c
+endif
+
+
diff --git a/nuttx/arch/avr/src/at90usb/at90usb_head.S b/nuttx/arch/avr/src/at90usb/at90usb_head.S
new file mode 100755
index 000000000..a6745d866
--- /dev/null
+++ b/nuttx/arch/avr/src/at90usb/at90usb_head.S
@@ -0,0 +1,220 @@
+/****************************************************************************

+ * 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

+ ****************************************************************************/

+

+#define STACKBASE (_ebss+CONFIG_IDLETHREAD_STACKSIZE-4)

+

+/****************************************************************************

+ * 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:

+

+	/* 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 */

+

+	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(__data_end)

+	cpc			r27, r17

+	brne		.Lcopyloop

+

+	/* 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

diff --git a/nuttx/arch/avr/src/at90usb/at90usb_internal.h b/nuttx/arch/avr/src/at90usb/at90usb_internal.h
new file mode 100644
index 000000000..3d7c4e7dc
--- /dev/null
+++ b/nuttx/arch/avr/src/at90usb/at90usb_internal.h
@@ -0,0 +1,245 @@
+/****************************************************************************
+ * arch/avr/src/at90usb/at90usb_internal.h
+ *
+ *   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.
+ *
+ ****************************************************************************/
+
+#ifndef __ARCH_AVR_SRC_ATMEGA_ATMEGA_INTERNAL_H
+#define __ARCH_AVR_SRC_ATMEGA_ATMEGA_INTERNAL_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include "at90usb_config.h"
+
+#ifdef CONFIG_AVR_GPIOIRQ
+#  include <nuttx/irq.h>
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Bit-encoded input to at90usb_configgpio() ********************************/
+# warning "Missing definitions"
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+#ifndef __ASSEMBLY__
+
+/****************************************************************************
+ * Inline Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#undef EXTERN
+#if defined(__cplusplus)
+#define EXTERN extern "C"
+extern "C" {
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_clkinit
+ *
+ * Description:
+ *   Initialiaze clock/PLL settings per the definitions in the board.h file.
+ *
+ ****************************************************************************/
+
+EXTERN void up_clkinitialize(void);
+
+/****************************************************************************
+ * Name: usart_reset
+ *
+ * Description:
+ *   Reset a USART.
+ *
+ ****************************************************************************/
+
+EXTERN void usart_reset(uintptr_t usart_base);
+
+/****************************************************************************
+ * Name: usart_configure
+ *
+ * Description:
+ *   Configure a USART as a RS-232 UART.
+ *
+ ****************************************************************************/
+
+void usart_configure(uintptr_t usart_base, uint32_t baud, unsigned int parity,
+                     unsigned int nbits, bool stop2);
+
+/****************************************************************************
+ * Name: up_consoleinit
+ *
+ * Description:
+ *   Initialize a console for debug output.  This function is called very
+ *   early in the intialization sequence to configure the serial console
+ *   uart (only).
+ *
+ ****************************************************************************/
+
+EXTERN void up_consoleinit(void);
+
+/****************************************************************************
+ * Name: up_boardinit
+ *
+ * Description:
+ *   This function must be provided by the board-specific logic in the
+ *   directory configs/<board-name>/up_boot.c.
+ *
+ ****************************************************************************/
+
+EXTERN void up_boardinitialize(void);
+
+/****************************************************************************
+ * Name: at90usb_configgpio
+ *
+ * Description:
+ *   Configure a GPIO pin based on bit-encoded description of the pin.
+ *
+ ****************************************************************************/
+
+EXTERN int at90usb_configgpio(uint16_t cfgset);
+
+/****************************************************************************
+ * Name: at90usb_gpiowrite
+ *
+ * Description:
+ *   Write one or zero to the selected GPIO pin
+ *
+ ****************************************************************************/
+
+EXTERN void at90usb_gpiowrite(uint16_t pinset, bool value);
+
+/****************************************************************************
+ * Name: at90usb_gpioread
+ *
+ * Description:
+ *   Read one or zero from the selected GPIO pin
+ *
+ ****************************************************************************/
+
+EXTERN bool at90usb_gpioread(uint16_t pinset);
+
+/****************************************************************************
+ * Name: gpio_irqinitialize
+ *
+ * Description:
+ *   Initialize all vectors to the unexpected interrupt handler
+ *
+ * Configuration Notes:
+ *   Configuration CONFIG_AVR_GPIOIRQ must be selected to enable the
+ *   overall GPIO IRQ feature.
+ *
+ * Assumptions:
+ *   Called during the early boot sequence before global interrupts have
+ *   been enabled.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_AVR_GPIOIRQ
+EXTERN void weak_function gpio_irqinitialize(void);
+#endif
+
+/****************************************************************************
+ * Name: gpio_irqattach
+ *
+ * Description:
+ *   Attach in GPIO interrupt to the provide 'isr'
+ *
+ * Configuration Notes:
+ *   Configuration CONFIG_AVR_GPIOIRQ must be selected to enable the
+ *   overall GPIO IRQ feature.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_AVR_GPIOIRQ
+EXTERN int gpio_irqattach(int irq, xcpt_t newisr, xcpt_t *oldisr);
+#endif
+
+/****************************************************************************
+ * Name: gpio_irqenable
+ *
+ * Description:
+ *   Enable the GPIO IRQ specified by 'irq'
+ *
+ * Configuration Notes:
+ *   Configuration CONFIG_AVR_GPIOIRQ must be selected to enable the
+ *   overall GPIO IRQ feature.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_AVR_GPIOIRQ
+EXTERN void gpio_irqenable(int irq);
+#endif
+
+/*****************************************************************************
+ * Name: gpio_irqdisable
+ *
+ * Description:
+ *   Disable the GPIO IRQ specified by 'irq'
+ *
+ * Configuration Notes:
+ *   Configuration CONFIG_AVR_GPIOIRQ must be selected to enable the
+ *   overall GPIO IRQ feature.
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_AVR_GPIOIRQ
+EXTERN void gpio_irqdisable(int irq);
+#endif
+
+#undef EXTERN
+#if defined(__cplusplus)
+}
+#endif
+
+#endif /* __ASSEMBLY__ */
+#endif /* __ARCH_AVR_SRC_ATMEGA_ATMEGA_INTERNAL_H */
+
diff --git a/nuttx/arch/avr/src/at90usb/at90usb_memorymap.h b/nuttx/arch/avr/src/at90usb/at90usb_memorymap.h
new file mode 100644
index 000000000..c312a7cca
--- /dev/null
+++ b/nuttx/arch/avr/src/at90usb/at90usb_memorymap.h
@@ -0,0 +1,68 @@
+/************************************************************************************
+ * arch/avr/src/at90usb/at90usb_memorymap.h
+ *
+ *   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.
+ *
+ ************************************************************************************/
+
+#ifndef __ARCH_AVR_SRC_ATMEGA_ATMEGA_MEMORYMAP_H
+#define __ARCH_AVR_SRC_ATMEGA_ATMEGA_MEMORYMAP_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+
+/* Physical memory map */
+# warning "Missing Definitions"
+
+/* Peripheral Address Map */
+# warning "Missing Definitions"
+
+/************************************************************************************
+ * Public Types
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Data
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+#endif /* __ARCH_AVR_SRC_ATMEGA_ATMEGA_MEMORYMAP_H */
+
diff --git a/nuttx/arch/avr/src/at90usb/chip.h b/nuttx/arch/avr/src/at90usb/chip.h
new file mode 100644
index 000000000..facc65ec1
--- /dev/null
+++ b/nuttx/arch/avr/src/at90usb/chip.h
@@ -0,0 +1,75 @@
+/************************************************************************************
+ * arch/avr/src/at90usb/chip.h
+ *
+ *   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.
+ *
+ ************************************************************************************/
+
+#ifndef __ARCH_AVR_SRC_ATMEGA_CHIP_H
+#define __ARCH_AVR_SRC_ATMEGA_CHIP_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+
+/* Define features for supported chip in the ATMEGA family */
+
+#if 0
+#else
+#  error "Unsupported AVR chip"
+#endif
+
+/* Include only the memory map.  Other chip hardware files should then include this
+ * file for the proper setup
+ */
+
+#include "at90usb_memorymap.h"
+
+/************************************************************************************
+ * Public Types
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Data
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+#endif /* __ARCH_AVR_SRC_ATMEGA_CHIP_H */
+
diff --git a/nuttx/arch/avr/src/atmega/atmega_head.S b/nuttx/arch/avr/src/atmega/atmega_head.S
new file mode 100755
index 000000000..ec11e4f7f
--- /dev/null
+++ b/nuttx/arch/avr/src/atmega/atmega_head.S
@@ -0,0 +1,214 @@
+/****************************************************************************

+ * arch/avr32/src/atmega/atmega_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

+ ****************************************************************************/

+

+#define STACKBASE (_ebss+CONFIG_IDLETHREAD_STACKSIZE-4)

+

+/****************************************************************************

+ * 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		atmega_int0		/* External interrupt request 0 */

+	.global		atmega_int1		/* External interrupt request 1 */

+	.global		atmega_int2		/* External interrupt request 2 */

+	.global		atmega_int3		/* External interrupt request 3 */

+	.global		atmega_int4		/* External interrupt request 4 */

+	.global		atmega_int5		/* External interrupt request 5 */

+	.global		atmega_int6		/* External interrupt request 6 */

+	.global		atmega_int7		/* External interrupt request 7 */

+	.global		atmega_t2comp	/* TIMER2 COMP timer/counter2 compare match */

+	.global		atmega_t2ovf	/* TIMER2 OVF timer/counter2 overflow */

+	.global		atmega_t1capt	/* TIMER1 CAPT timer/counter1 capture event */

+	.global		atmega_t1compa	/* TIMER1 COMPA timer/counter1 compare match a */

+	.global		atmega_t1compb	/* TIMER1 COMPB timer/counter1 compare match b */

+	.global		atmega_t1ovf	/* TIMER1 OVF timer/counter1 overflow */

+	.global		atmega_t0comp	/* TIMER0 COMP timer/counter0 compare match */

+	.global		atmega_t0ovf	/* TIMER0 OVF timer/counter0 overflow */

+	.global		atmega_spi		/* STC SPI serial transfer complete */

+	.global		atmega_u0rx		/* USART0 RX complete */

+	.global		atmega_u0dre	/* USART0 data register empty */

+	.global		atmega_u0tx		/* USART0 TX complete */

+	.global		atmega_adc		/* ADC conversion complete */

+	.global		atmega_ee		/* EEPROM ready */

+	.global		atmega_anacomp	/* ANALOG COMP analog comparator */

+	.global		atmega_t1compc	/* TIMER1 COMPC timer/countre1 compare match c */

+	.global		atmega_t3capt	/* TIMER3 CAPT timer/counter3 capture event */

+	.global		atmega_t3compa	/* TIMER3 COMPA timer/counter3 compare match a */

+	.global		atmega_t3compb	/* TIMER3 COMPB timer/counter3 compare match b */

+	.global		atmega_t3compc	/* TIMER3 COMPC timer/counter3 compare match c */

+	.global		atmega_t3ovf	/* TIMER3 OVF timer/counter3 overflow */

+	.global		atmega_u1rx		/* USART1 RX complete */

+	.global		atmega_u1dre	/* USART1 data register empty */

+	.global		atmega_u1tx		/* USART1 TX complete */

+	.global		atmega_twi		/* TWI two-wire serial interface */

+	.global		atmega_spmrdy	/* Store program memory ready */

+

+/****************************************************************************

+ * Macros

+ ****************************************************************************/

+

+	.macro		vector name

+	jmp			\name

+	.endm

+

+/****************************************************************************

+ * Vector Table

+ ****************************************************************************/

+

+/* The ATmega128 has 35 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		atmega_int0		/*  1: External interrupt request 0 */

+	vector		atmega_int1		/*  2: External interrupt request 1 */

+	vector		atmega_int2		/*  3: External interrupt request 2 */

+	vector		atmega_int3		/*  4: External interrupt request 3 */

+	vector		atmega_int4		/*  5: External interrupt request 4 */

+	vector		atmega_int5		/*  6 : External interrupt request 5 */

+	vector		atmega_int6		/*  7: External interrupt request 6 */

+	vector		atmega_int7		/*  8: External interrupt request 7 */

+	vector		atmega_t2comp	/*  9: TIMER2 COMP timer/counter2 compare match */

+	vector		atmega_t2ovf	/* 10: TIMER2 OVF timer/counter2 overflow */

+	vector		atmega_t1capt	/* 11: TIMER1 CAPT timer/counter1 capture event */

+	vector		atmega_t1compa	/* 12: TIMER1 COMPA timer/counter1 compare match a */

+	vector		atmega_t1compb	/* 13: TIMER1 COMPB timer/counter1 compare match b */

+	vector		atmega_t1ovf	/* 14: TIMER1 OVF timer/counter1 overflow */

+	vector		atmega_t0comp	/* 15: TIMER0 COMP timer/counter0 compare match */

+	vector		atmega_t0ovf	/* 16: TIMER0 OVF timer/counter0 overflow */

+	vector		atmega_spi		/* 17: STC SPI serial transfer complete */

+	vector		atmega_u0rx		/* 18: USART0 RX complete */

+	vector		atmega_u0dre	/* 19: USART0 data register empty */

+	vector		atmega_u0tx		/* 20: USART0 TX complete */

+	vector		atmega_adc		/* 21: ADC conversion complete */

+	vector		atmega_ee		/* 22: EEPROM ready */

+	vector		atmega_anacomp	/* 23: ANALOG COMP analog comparator */

+	vector		atmega_t1compc	/* 24: TIMER1 COMPC timer/countre1 compare match c */

+	vector		atmega_t3capt	/* 25: TIMER3 CAPT timer/counter3 capture event */

+	vector		atmega_t3compa	/* 26: TIMER3 COMPA timer/counter3 compare match a */

+	vector		atmega_t3compb	/* 27: TIMER3 COMPB timer/counter3 compare match b */

+	vector		atmega_t3compc	/* 28: TIMER3 COMPC timer/counter3 compare match c */

+	vector		atmega_t3ovf	/* 29: TIMER3 OVF timer/counter3 overflow */

+	vector		atmega_u1rx		/* 30: USART1 RX complete */

+	vector		atmega_u1dre	/* 31: USART1 data register empty */

+	vector		atmega_u1tx		/* 32: USART1 TX complete */

+	vector		atmega_twi		/* 33: TWI two-wire serial interface */

+	vector		atmega_spmrdy	/* 34: Store program memory ready */

+	.endfunc

+

+/****************************************************************************

+ * Reset Entry Point

+ ****************************************************************************/

+

+	.section	.init, "ax", @progbits

+	.func		__start

+__start:

+

+	/* 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 */

+

+	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(__data_end)

+	cpc			r27, r17

+	brne		.Lcopyloop

+

+	/* 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