/************************************************************
* irq.h
*
* Copyright (C) 2007 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 Gregory Nutt 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_IRQ_H
#define __ARCH_IRQ_H
/************************************************************
* Included Files
************************************************************/
#include <nuttx/config.h>
/************************************************************
* Definitions
************************************************************/
#define EXT_INT0_IRQ 0
#define TIMER0_IRQ 1
#define EXT_INT1_IRQ 2
#define TIMER1_IRQ 3
#define UART_IRQ 4
#define TIMER2_IRQ 5
#define NR_IRQS 6
/* The stack for all tasks/threads lie at the same position
* in IRAM. On context switches, the STACK contents will be
* copied into the TCB.
*/
#define IRAM_BASE 0x0000
#ifdef CONFIG_ARCH_8052
# define IRAM_SIZE 0x0100
#else
# define IRAM_SIZE 0x0080
#endif
#define STACK_BASE 0x0024
#define STACK_SIZE (IRAM_SIZE - STACK_BASE)
/* This is the form of initial stack frame
*
* This initial stack frame will be configured to hold.
* (1) The 16-bit return address of either:
*
* void task_start(void);
* void pthread_start(void)
*
* The return address is stored at the top of stack.
* so that the RETI instruction will work:
*
* PC15-8 <- ((SP))
* (SP) <- (SP) -1
* PC7-0 <- ((SP))
* (SP) <- (SP) -1
*/
#define FRAME_RETLS 0
#define FRAME_RETMS 1
/* Then a partial context context save area that can be
* indexed with the following definitions (relative to the
* beginning of the initial frame.
*/
#define FRAME_ACC 2
#define FRAME_IE 3
#define FRAME_DPL 4
#define FRAME_DPH 5
#define FRAME_SIZE 6
/* The remaining registers are not saved on the stack (due
* to the limited stack size of the 8051/2) but in an array
* in the TCB:
*/
#define REGS_B 0
#define REGS_R2 1
#define REGS_R3 2
#define REGS_R4 3
#define REGS_R5 4
#define REGS_R6 5
#define REGS_R7 6
#define REGS_R0 7
#define REGS_R1 8
#define REGS_PSW 9
#define REGS_BP 10
#define REGS_SIZE 11
/* Note that the stack pointer is not saved. Rather, the
* size of the saved stack frame is saved in the 'nbytes'
* field. Since that stack begins at a fixed location, the
* top-of-stack pointer can be derived from the saved size.
*/
/* These are offsets into struct xcptcontext that can be
* used from assembly language to access the structure.
*/
#define XCPT_NBYTES 0
#define XCPT_STACK 1
#define XCPT_REGS (STACK_SIZE+1)
#define XCPT_SIZE (STACK_SIZE+REGS_SIZE+1)
/************************************************************
* Public Types
************************************************************/
/* This struct defines the way the registers are stored */
#ifndef __ASSEMBLY__
struct xcptcontext
{
/* This is the number of valid bytes currently saved in
* stack[]. Since that stack begins at a fixed location,
* the top-of-stack pointer can be derived from this size.
*/
ubyte nbytes;
/* This is the saved stack. Space is allocated for the
* entire 256 byte IRAM (minus register and bit usage at
* the beginning).
*/
ubyte stack[STACK_SIZE];
/* These are save 8051/2 registers. These are saved
* separately from the stack to increase the effective
* stack size.
*/
ubyte regs[REGS_SIZE];
};
#endif /* __ASSEMBLY */
/************************************************************
* Public Variables
************************************************************/
/************************************************************
* Public Function Prototypes
************************************************************/
#ifndef __ASSEMBLY__
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C" {
#else
#define EXTERN extern
#endif
EXTERN irqstate_t irqsave(void);
EXTERN void irqrestore(irqstate_t flags);
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __ASSEMBLY */
#endif /* __ARCH_IRQ_H */
