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206 lines
5.8 KiB
206 lines
5.8 KiB
/************************************************************************ |
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* irq.h |
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* |
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* Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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************************************************************************/ |
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/* This file should never be included directed but, rather, |
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* only indirectly through nuttx/irq.h |
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*/ |
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#ifndef __ARCH_IRQ_H |
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#define __ARCH_IRQ_H |
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/************************************************************************ |
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* Included Files |
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************************************************************************/ |
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#include <nuttx/config.h> |
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#ifndef __ASSEMBLY__ |
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# include <stdint.h> |
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#endif |
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/************************************************************************ |
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* Definitions |
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************************************************************************/ |
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#define EXT_INT0_IRQ 0 |
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#define TIMER0_IRQ 1 |
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#define EXT_INT1_IRQ 2 |
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#define TIMER1_IRQ 3 |
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#define UART_IRQ 4 |
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#define TIMER2_IRQ 5 |
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#define NR_IRQS 6 |
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/* The stack for all tasks/threads lie at the same position |
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* in IRAM. On context switches, the STACK contents will be |
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* copied into the TCB. |
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*/ |
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#define IRAM_BASE 0x0000 |
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#ifdef CONFIG_ARCH_CHIP_8052 |
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# define IRAM_SIZE 0x0100 |
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#else |
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# define IRAM_SIZE 0x0080 |
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#endif |
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#define STACK_BASE 0x0024 |
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#define STACK_SIZE (IRAM_SIZE - STACK_BASE) |
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/* This is the form of initial stack frame |
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* |
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* This initial stack frame will be configured to hold. |
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* (1) The 16-bit return address of either: |
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* |
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* void task_start(void); |
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* void pthread_start(void) |
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* |
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* The return address is stored at the top of stack. |
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* so that the RETI instruction will work: |
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* |
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* PC15-8 <- ((SP)) |
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* (SP) <- (SP) -1 |
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* PC7-0 <- ((SP)) |
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* (SP) <- (SP) -1 |
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*/ |
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#define FRAME_RETLS 0 |
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#define FRAME_RETMS 1 |
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/* Then a partial context context save area that can be |
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* indexed with the following definitions (relative to the |
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* beginning of the initial frame. |
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*/ |
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#define FRAME_ACC 2 |
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#define FRAME_IE 3 |
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#define FRAME_DPL 4 |
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#define FRAME_DPH 5 |
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#define FRAME_SIZE 6 |
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/* The remaining registers are not saved on the stack (due |
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* to the limited stack size of the 8051/2) but in an array |
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* in the TCB: |
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*/ |
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#define REGS_B 0 |
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#define REGS_R2 1 |
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#define REGS_R3 2 |
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#define REGS_R4 3 |
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#define REGS_R5 4 |
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#define REGS_R6 5 |
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#define REGS_R7 6 |
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#define REGS_R0 7 |
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#define REGS_R1 8 |
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#define REGS_PSW 9 |
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#define REGS_BP 10 |
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#define REGS_SIZE 11 |
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/* Note that the stack pointer is not saved. Rather, the |
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* size of the saved stack frame is saved in the 'nbytes' |
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* field. Since that stack begins at a fixed location, the |
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* top-of-stack pointer can be derived from the saved size. |
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*/ |
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/* These are offsets into struct xcptcontext that can be |
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* used from assembly language to access the structure. |
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*/ |
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#define XCPT_NBYTES 0 |
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#define XCPT_STACK 1 |
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#define XCPT_REGS (STACK_SIZE+1) |
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#define XCPT_SIZE (STACK_SIZE+REGS_SIZE+1) |
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/************************************************************************ |
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* Public Types |
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************************************************************************/ |
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/* This struct defines the way the registers are stored */ |
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#ifndef __ASSEMBLY__ |
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struct xcptcontext |
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{ |
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/* This is the number of valid bytes currently saved in |
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* stack[]. Since that stack begins at a fixed location, |
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* the top-of-stack pointer can be derived from this size. |
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*/ |
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uint8_t nbytes; |
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/* This is the saved stack. Space is allocated for the |
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* entire 256 byte IRAM (minus register and bit usage at |
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* the beginning). |
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*/ |
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uint8_t stack[STACK_SIZE]; |
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/* These are save 8051/2 registers. These are saved |
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* separately from the stack to increase the effective |
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* stack size. |
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*/ |
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uint8_t regs[REGS_SIZE]; |
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}; |
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#endif /* __ASSEMBLY */ |
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/************************************************************************ |
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* Public Variables |
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************************************************************************/ |
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/************************************************************************ |
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* Public Function Prototypes |
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************************************************************************/ |
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#ifndef __ASSEMBLY__ |
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#ifdef __cplusplus |
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#define EXTERN extern "C" |
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extern "C" { |
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#else |
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#define EXTERN extern |
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#endif |
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EXTERN irqstate_t irqsave(void); |
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EXTERN void irqrestore(irqstate_t flags); |
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#undef EXTERN |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* __ASSEMBLY */ |
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#endif /* __ARCH_IRQ_H */ |
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