/************************************************************ * arch/irq.h * * Copyright (C) 2007 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include /************************************************************ * Definitions ************************************************************/ /* IRQ Stack Frame Format: * * Context is always saved/restored in the same way: * * (1) stmia rx, {r0-r14} * (2) then the PC and CPSR * * This results in the following set of indices that * can be used to access individual registers in the * xcp.regs array: */ #define REG_R0 (0) #define REG_R1 (1) #define REG_R2 (2) #define REG_R3 (3) #define REG_R4 (4) #define REG_R5 (5) #define REG_R6 (6) #define REG_R7 (7) #define REG_R8 (8) #define REG_R9 (9) #define REG_R10 (10) #define REG_R11 (11) #define REG_R12 (12) #define REG_R13 (13) #define REG_R14 (14) #define REG_R15 (15) #define REG_CPSR (16) #define XCPTCONTEXT_REGS (17) #define XCPTCONTEXT_SIZE (4 * XCPTCONTEXT_REGS) #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 /************************************************************ * Public Types ************************************************************/ /* This struct defines the way the registers are stored. We * need to save: * * 1 CPSR * 7 Static registers, v1-v7 (aka r4-r10) * 1 Frame pointer, fp (aka r11) * 1 Stack pointer, sp (aka r13) * 1 Return address, lr (aka r14) * --- * 11 (XCPTCONTEXT_USER_REG) * * On interrupts, we also need to save: * 4 Volatile registers, a1-a4 (aka r0-r3) * 1 Scratch Register, ip (aka r12) *--- * 5 (XCPTCONTEXT_IRQ_REGS) * * For a total of 17 (XCPTCONTEXT_REGS) */ #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 */ #endif /* These are saved copies of LR and CPSR used during * signal processing. */ uint32 saved_pc; uint32 saved_cpsr; /* Register save area */ uint32 regs[XCPTCONTEXT_REGS]; }; #endif /************************************************************ * Inline functions ************************************************************/ #ifndef __ASSEMBLY__ /* Save the current interrupt enable state & disable IRQs */ static inline irqstate_t irqsave(void) { unsigned int flags; unsigned int temp; __asm__ __volatile__ ( "\tmrs %0, cpsr\n" "\torr %1, %0, #128\n" "\tmsr cpsr_c, %1" : "=r" (flags), "=r" (temp) : : "memory"); return flags; } /* Restore saved IRQ & FIQ state */ static inline void irqrestore(irqstate_t flags) { __asm__ __volatile__ ( "msr cpsr_c, %0" : : "r" (flags) : "memory"); } static inline void system_call(swint_t func, int parm1, int parm2, int parm3) { __asm__ __volatile__ ( "mov\tr0,%0\n\t" "mov\tr1,%1\n\t" "mov\tr2,%2\n\t" "mov\tr3,%3\n\t" "swi\t0x900001\n\t" : : "r" ((long)(func)), "r" ((long)(parm1)), "r" ((long)(parm2)), "r" ((long)(parm3)) : "r0", "r1", "r2", "r3", "lr"); } #endif /************************************************************ * 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_IRQ_H */