/**************************************************************************** * arch/arm/include/armv6-m/irq.h * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /* This file should never be included directly but, rather, only indirectly * through nuttx/irq.h */ #ifndef __ARCH_ARM_INCLUDE_ARMV6_M_IRQ_H #define __ARCH_ARM_INCLUDE_ARMV6_M_IRQ_H /**************************************************************************** * Included Files ****************************************************************************/ #include #include #ifndef __ASSEMBLY__ # include # include #endif #include /**************************************************************************** * Pre-processor Prototypes ****************************************************************************/ /* Configuration ************************************************************/ /* If this is a kernel build, * how many nested system calls should we support? */ #ifndef CONFIG_SYS_NNEST # define CONFIG_SYS_NNEST 2 #endif /* IRQ Stack Frame Format *************************************************** * * The following additional registers are stored by the interrupt handling * logic. */ #define REG_R13 (0) /* R13 = SP at time of interrupt */ #define REG_PRIMASK (1) /* PRIMASK */ #define REG_R4 (2) /* R4 */ #define REG_R5 (3) /* R5 */ #define REG_R6 (4) /* R6 */ #define REG_R7 (5) /* R7 */ #define REG_R8 (6) /* R8 */ #define REG_R9 (7) /* R9 */ #define REG_R10 (8) /* R10 */ #define REG_R11 (9) /* R11 */ /* In the kernel build, we may return to either privileged or unprivileged * modes. */ #ifdef CONFIG_BUILD_PROTECTED # define REG_EXC_RETURN (10) /* EXC_RETURN */ # define SW_XCPT_REGS (11) #else # define SW_XCPT_REGS (10) #endif /* The total number of registers saved by software */ #define SW_XCPT_SIZE (4 * SW_XCPT_REGS) /* On entry into an IRQ, the hardware automatically saves the following * registers on the stack in this (address) order: */ #define REG_R0 (SW_XCPT_REGS+0) /* R0 */ #define REG_R1 (SW_XCPT_REGS+1) /* R1 */ #define REG_R2 (SW_XCPT_REGS+2) /* R2 */ #define REG_R3 (SW_XCPT_REGS+3) /* R3 */ #define REG_R12 (SW_XCPT_REGS+4) /* R12 */ #define REG_R14 (SW_XCPT_REGS+5) /* R14 = LR */ #define REG_R15 (SW_XCPT_REGS+6) /* R15 = PC */ #define REG_XPSR (SW_XCPT_REGS+7) /* xPSR */ #define HW_XCPT_REGS (8) #define HW_XCPT_SIZE (4 * HW_XCPT_REGS) #define XCPTCONTEXT_REGS (HW_XCPT_REGS + SW_XCPT_REGS) #define XCPTCONTEXT_SIZE (4 * XCPTCONTEXT_REGS) /* Alternate register names */ #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_R7 #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 /* CONTROL register */ #define CONTROL_FPCA (1 << 2) /* Bit 2: Floating-point context active */ #define CONTROL_SPSEL (1 << 1) /* Bit 1: Stack-pointer select */ #define CONTROL_NPRIV (1 << 0) /* Bit 0: Not privileged */ /**************************************************************************** * Public Types ****************************************************************************/ #ifndef __ASSEMBLY__ /* This structure represents the return state from a system call */ #ifdef CONFIG_LIB_SYSCALL struct xcpt_syscall_s { uint32_t excreturn; /* The EXC_RETURN value */ uint32_t sysreturn; /* The return PC */ }; #endif /* The following structure is included in the TCB and defines the complete * state of the thread. */ struct xcptcontext { /* The following function pointer is non-zero if there * are pending signals to be processed. */ void *sigdeliver; /* Actual type is sig_deliver_t */ /* These are saved copies of the context used during * signal processing. */ uint32_t *saved_regs; #ifdef CONFIG_BUILD_PROTECTED /* This is the saved address to use when returning from a user-space * signal handler. */ uint32_t sigreturn; #endif #ifdef CONFIG_LIB_SYSCALL /* The following array holds the return address and the exc_return value * needed to return from each nested system call. */ uint8_t nsyscalls; struct xcpt_syscall_s syscall[CONFIG_SYS_NNEST]; #endif /* Register save area with XCPTCONTEXT_SIZE, only valid when: * 1.The task isn't running or * 2.The task is interrupted * otherwise task is running, and regs contain the stale value. */ uint32_t *regs; }; #endif /**************************************************************************** * Inline functions ****************************************************************************/ #ifndef __ASSEMBLY__ /* Name: up_irq_save, up_irq_restore, and friends. * * NOTE: This function should never be called from application code and, * as a general rule unless you really know what you are doing, this * function should not be called directly from operation system code either: * Typically, the wrapper functions, enter_critical_section() and * leave_critical section(), are probably what you really want. */ /* Get/set the PRIMASK register */ static inline uint8_t getprimask(void) always_inline_function; 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) always_inline_function; static inline void setprimask(uint32_t primask) { __asm__ __volatile__ ( "\tmsr primask, %0\n" : : "r" (primask) : "memory"); } /* Disable IRQs */ static inline void up_irq_disable(void) always_inline_function; static inline void up_irq_disable(void) { __asm__ __volatile__ ("\tcpsid i\n"); } /* Save the current primask state & disable IRQs */ static inline irqstate_t up_irq_save(void) always_inline_function; static inline irqstate_t up_irq_save(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; } /* Enable IRQs */ static inline void up_irq_enable(void) always_inline_function; static inline void up_irq_enable(void) { __asm__ __volatile__ ("\tcpsie i\n"); } /* Restore saved primask state */ static inline void up_irq_restore(irqstate_t flags) always_inline_function; static inline void up_irq_restore(irqstate_t flags) { /* If bit 0 of the primask is 0, then we need to restore * interrupts. */ __asm__ __volatile__ ( "\tmsr primask, %0\n" : : "r" (flags) : "memory"); } /* Get/set IPSR */ static inline uint32_t getipsr(void) always_inline_function; static inline uint32_t getipsr(void) { uint32_t ipsr; __asm__ __volatile__ ( "\tmrs %0, ipsr\n" : "=r" (ipsr) : : "memory"); return ipsr; } /* Get/set CONTROL */ static inline uint32_t getcontrol(void) always_inline_function; static inline uint32_t getcontrol(void) { uint32_t control; __asm__ __volatile__ ( "\tmrs %0, control\n" : "=r" (control) : : "memory"); return control; } static inline void setcontrol(uint32_t control) always_inline_function; static inline void setcontrol(uint32_t control) { __asm__ __volatile__ ( "\tmsr control, %0\n" : : "r" (control) : "memory"); } #endif /* __ASSEMBLY__ */ /**************************************************************************** * Public Data ****************************************************************************/ /**************************************************************************** * 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_ARMV6_M_IRQ_H */