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incubator-nuttx/arch/arm/include/cortexm3/irq.h

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/****************************************************************************
* arch/arm/include/cortexm3/irq.h
*
* Copyright (C) 2009 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_ARM_INCLUDE_CORTEXM3_IRQ_H
#define __ARCH_ARM_INCLUDE_CORTEXM3_IRQ_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/irq.h>
#ifndef __ASSEMBLY__
# include <stdint.h>
#endif
/****************************************************************************
* Definitions
****************************************************************************/
/* IRQ Stack Frame Format: */
/* On entry into an IRQ, the hardware automatically saves the following
* registers on the stack in this (address) order:
*/
#define REG_XPSR (17) /* xPSR */
#define REG_R15 (16) /* R15 = PC */
#define REG_R14 (15) /* R14 = LR */
#define REG_R12 (14) /* R12 */
#define REG_R3 (13) /* R3 */
#define REG_R2 (12) /* R2 */
#define REG_R1 (11) /* R1 */
#define REG_R0 (10) /* R0 */
#define HW_XCPT_REGS (8)
#define HW_XCPT_SIZE (4 * HW_XCPT_REGS)
/* The following additional registers are stored by the interrupt handling
* logic.
*/
#define REG_R11 (9) /* R11 */
#define REG_R10 (8) /* R10 */
#define REG_R9 (7) /* R9 */
#define REG_R8 (6) /* R8 */
#define REG_R7 (5) /* R7 */
#define REG_R6 (4) /* R6 */
#define REG_R5 (3) /* R5 */
#define REG_R4 (2) /* R4 */
#define REG_PRIMASK (1) /* PRIMASK */
#define REG_R13 (0) /* R13 = SP at time of interrupt */
#define SW_XCPT_REGS (10)
#define SW_XCPT_SIZE (4 * SW_XCPT_REGS)
#define XCPTCONTEXT_REGS (HW_XCPT_REGS + SW_XCPT_REGS)
#define XCPTCONTEXT_SIZE (HW_XCPT_SIZE + SW_XCPT_SIZE)
#define REG_A1 REG_R0
#define REG_A2 REG_R1
#define REG_A3 REG_R2
#define REG_A4 REG_R3
#define REG_V1 REG_R4
#define REG_V2 REG_R5
#define REG_V3 REG_R6
#define REG_V4 REG_R7
#define REG_V5 REG_R8
#define REG_V6 REG_R9
#define REG_V7 REG_R10
#define REG_SB REG_R9
#define REG_SL REG_R10
#define REG_FP REG_R11
#define REG_IP REG_R12
#define REG_SP REG_R13
#define REG_LR REG_R14
#define REG_PC REG_R15
/* The PIC register is usually R10. It can be R9 is stack checking is enabled
* or if the user changes it with -mpic-register on the GCC command line.
*/
#define REG_PIC REG_R10
/****************************************************************************
* Public Types
****************************************************************************/
/* The following structure is included in the TCB and defines the complete
* state of the thread.
*/
#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 LR, PRIMASK, and xPSR used during
* signal processing.
*/
uint32_t saved_pc;
uint32_t saved_primask;
uint32_t saved_xpsr;
#endif
/* Register save area */
uint32_t regs[XCPTCONTEXT_REGS];
};
#endif
/****************************************************************************
* Inline functions
****************************************************************************/
#ifndef __ASSEMBLY__
/* Save the current primask state & disable IRQs */
static inline irqstate_t irqsave(void)
{
unsigned short primask;
/* Return the current value of primask register and set
* bit 0 of the primask register to disable interrupts
*/
__asm__ __volatile__
(
"\tmrs %0, primask\n"
"\tcpsid i\n"
: "=r" (primask)
:
: "memory");
return primask;
}
/* Restore saved primask state */
static inline void irqrestore(irqstate_t primask)
{
/* If bit 0 of the primask is 0, then we need to restore
* interupts.
*/
__asm__ __volatile__
(
"\ttst %0, #1\n"
"\tbne 1f\n"
"\tcpsie i\n"
"1:\n"
:
: "r" (primask)
: "memory");
}
/* Get/set the primask register */
static inline uint8_t getprimask(void)
{
uint32_t primask;
__asm__ __volatile__
(
"\tmrs %0, primask\n"
: "=r" (primask)
:
: "memory");
return (uint8_t)primask;
}
static inline void setprimask(uint32_t primask)
{
__asm__ __volatile__
(
"\tmsr primask, %0\n"
:
: "r" (primask)
: "memory");
}
/* Get/set the basepri register */
static inline uint8_t getbasepri(void)
{
uint32_t basepri;
__asm__ __volatile__
(
"\tmrs %0, basepri\n"
: "=r" (basepri)
:
: "memory");
return (uint8_t)basepri;
}
static inline void setbasepri(uint32_t basepri)
{
__asm__ __volatile__
(
"\tmsr basepri, %0\n"
:
: "r" (basepri)
: "memory");
}
/* Get IPSR */
static inline uint32_t getipsr(void)
{
uint32_t ipsr;
__asm__ __volatile__
(
"\tmrs %0, ipsr\n"
: "=r" (ipsr)
:
: "memory");
return ipsr;
}
/* SVC system call */
static inline void svcall(uint32_t cmd, uint32_t arg)
{
__asm__ __volatile__
(
"\tmov r0, %0\n"
"\tmov r1, %1\n"
"\tsvc 0\n"
:
: "r" (cmd), "r" (arg)
: "memory");
}
#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_ARM_INCLUDE_CORTEXM3_IRQ_H */
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