diff options
Diffstat (limited to 'nuttx/arch/8051/include/irq.h')
-rw-r--r-- | nuttx/arch/8051/include/irq.h | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/nuttx/arch/8051/include/irq.h b/nuttx/arch/8051/include/irq.h new file mode 100644 index 000000000..29b19d280 --- /dev/null +++ b/nuttx/arch/8051/include/irq.h @@ -0,0 +1,206 @@ +/************************************************************************ + * irq.h + * + * Copyright (C) 2007, 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_IRQ_H +#define __ARCH_IRQ_H + +/************************************************************************ + * Included Files + ************************************************************************/ + +#include <nuttx/config.h> +#ifndef __ASSEMBLY__ +# include <stdint.h> +#endif + +/************************************************************************ + * 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. + */ + + uint8_t nbytes; + + /* This is the saved stack. Space is allocated for the + * entire 256 byte IRAM (minus register and bit usage at + * the beginning). + */ + + uint8_t stack[STACK_SIZE]; + + /* These are save 8051/2 registers. These are saved + * separately from the stack to increase the effective + * stack size. + */ + + uint8_t 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 */ + |