/****************************************************************************
* arch/avr/include/avr32/irq.h
*
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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_AVR32_IRQ_H
#define __ARCH_AVR_INCLUDE_AVR32_IRQ_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/irq.h>
#include <arch/avr32/avr32.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/* General notes about the AVR32 ABI:
*
* Scratch/Volatile Registers: r8-r12
* Preserved/Static Registers: r0-r7
* Parameter Passing: r12-R8 (in that order)
*/
/* Register state save array indices.
*
* The following registers are saved by the AVR32 hardware (for the case of
* interrupts only). Note the registers are order in the opposite order the
* they appear in memory (i.e., in the order of increasing address) because
* this makes it easier to following the ordering of pushing on a push-down
* stack.
*/
#define REG_R8 16
#define REG_R9 15
#define REG_R10 14
#define REG_R11 13
#define REG_R12 12
#define REG_R14 11
#define REG_R15 10
#define REG_SR 9
#define REG_LR REG_R14
#define REG_PC REG_R15
/* Additional registers saved in order have the full CPU context */
#define REG_R13 8
#define REG_SP REG_R13
#define REG_R0 7
#define REG_R1 6
#define REG_R2 5
#define REG_R3 4
#define REG_R4 3
#define REG_R5 2
#define REG_R6 1
#define REG_R7 0
/* Size of the register state save array (in 32-bit words) */
#define INTCONTEXT_REGS 8 /* r8-r12, lr, pc, sr */
#define XCPTCONTEXT_REGS 17 /* Plus r0-r7, sp */
/****************************************************************************
* Public Types
****************************************************************************/
/* This struct defines the way the registers are stored. */
#ifndef __ASSEMBLY__
struct xcptcontext
{
/* The following function pointer is non-zero if there are pending signals
* to be processed.
*/
#ifndef CONFIG_DISABLE_SIGNALS
void *sigdeliver; /* Actual type is sig_deliver_t */
/* These are saved copies of PC and SR used during signal processing.*/
uint32_t saved_pc;
uint32_t saved_sr;
#endif
/* Register save area */
uint32_t regs[XCPTCONTEXT_REGS];
};
#endif
/****************************************************************************
* Inline functions
****************************************************************************/
#ifndef __ASSEMBLY__
/* Read the AVR32 status register */
static inline uint32_t avr32_sr(void)
{
uint32_t sr;
__asm__ __volatile__ (
"mfsr\t%0,%1\n\t"
: "=r" (sr)
: "i" (AVR32_SR)
);
return sr;
}
/* Read the interrupt vector base address */
static inline uint32_t avr32_evba(void)
{
uint32_t evba;
__asm__ __volatile__ (
"mfsr\t%0,%1\n\t"
: "=r" (evba)
: "i" (AVR32_EVBA)
);
return evba;
}
/* Save the current interrupt enable state & disable all interrupts */
static inline irqstate_t irqsave(void)
{
irqstate_t sr = (irqstate_t)avr32_sr();
__asm__ __volatile__ (
"ssrf\t%0\n\t"
"nop\n\t"
"nop"
:
: "i" (AVR32_SR_GM_SHIFT)
);
return sr;
}
/* Restore saved interrupt state */
static inline void irqrestore(irqstate_t flags)
{
if ((flags & AVR32_SR_GM_MASK) == 0)
{
__asm__ __volatile__ (
"csrf\t%0\n\t"
"nop\n\t"
"nop"
:
: "i" (AVR32_SR_GM_SHIFT)
);
}
}
#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_AVR32_IRQ_H */
