7b9978883c
The current context save implementation saves registers of each task to xcp context, which is unnecessary because most of the arm registers are already saved in the task stack, this commit replace the xcp context with stack context to improve context switching performance and reduce the tcb space occupation of tcb instance. Signed-off-by: chao.an <anchao@xiaomi.com>
367 lines
9.6 KiB
C
367 lines
9.6 KiB
C
/****************************************************************************
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* arch/arm/include/armv6-m/irq.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/* This file should never be included directly but, rather, only indirectly
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* through nuttx/irq.h
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*/
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#ifndef __ARCH_ARM_INCLUDE_ARMV6_M_IRQ_H
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#define __ARCH_ARM_INCLUDE_ARMV6_M_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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#include <nuttx/irq.h>
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#ifndef __ASSEMBLY__
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# include <nuttx/compiler.h>
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# include <stdint.h>
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#endif
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#include <arch/chip/chip.h>
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/****************************************************************************
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* Pre-processor Prototypes
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****************************************************************************/
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/* Configuration ************************************************************/
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/* If this is a kernel build,
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* how many nested system calls should we support?
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*/
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#ifndef CONFIG_SYS_NNEST
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# define CONFIG_SYS_NNEST 2
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#endif
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/* IRQ Stack Frame Format ***************************************************
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*
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* The following additional registers are stored by the interrupt handling
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* logic.
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*/
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#define REG_R13 (0) /* R13 = SP at time of interrupt */
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#define REG_PRIMASK (1) /* PRIMASK */
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#define REG_R4 (2) /* R4 */
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#define REG_R5 (3) /* R5 */
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#define REG_R6 (4) /* R6 */
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#define REG_R7 (5) /* R7 */
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#define REG_R8 (6) /* R8 */
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#define REG_R9 (7) /* R9 */
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#define REG_R10 (8) /* R10 */
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#define REG_R11 (9) /* R11 */
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/* In the kernel build, we may return to either privileged or unprivileged
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* modes.
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*/
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#ifdef CONFIG_BUILD_PROTECTED
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# define REG_EXC_RETURN (10) /* EXC_RETURN */
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# define SW_XCPT_REGS (11)
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#else
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# define SW_XCPT_REGS (10)
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#endif
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/* The total number of registers saved by software */
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#define SW_XCPT_SIZE (4 * SW_XCPT_REGS)
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/* On entry into an IRQ, the hardware automatically saves the following
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* registers on the stack in this (address) order:
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*/
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#define REG_R0 (SW_XCPT_REGS+0) /* R0 */
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#define REG_R1 (SW_XCPT_REGS+1) /* R1 */
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#define REG_R2 (SW_XCPT_REGS+2) /* R2 */
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#define REG_R3 (SW_XCPT_REGS+3) /* R3 */
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#define REG_R12 (SW_XCPT_REGS+4) /* R12 */
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#define REG_R14 (SW_XCPT_REGS+5) /* R14 = LR */
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#define REG_R15 (SW_XCPT_REGS+6) /* R15 = PC */
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#define REG_XPSR (SW_XCPT_REGS+7) /* xPSR */
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#define HW_XCPT_REGS (8)
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#define HW_XCPT_SIZE (4 * HW_XCPT_REGS)
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#define XCPTCONTEXT_REGS (HW_XCPT_REGS + SW_XCPT_REGS)
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#define XCPTCONTEXT_SIZE (4 * XCPTCONTEXT_REGS)
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/* Alternate register names */
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#define REG_A1 REG_R0
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#define REG_A2 REG_R1
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#define REG_A3 REG_R2
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#define REG_A4 REG_R3
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#define REG_V1 REG_R4
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#define REG_V2 REG_R5
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#define REG_V3 REG_R6
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#define REG_V4 REG_R7
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#define REG_V5 REG_R8
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#define REG_V6 REG_R9
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#define REG_V7 REG_R10
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#define REG_SB REG_R9
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#define REG_SL REG_R10
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#define REG_FP REG_R7
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#define REG_IP REG_R12
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#define REG_SP REG_R13
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#define REG_LR REG_R14
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#define REG_PC REG_R15
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/* The PIC register is usually R10. It can be R9 is stack checking is enabled
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* or if the user changes it with -mpic-register on the GCC command line.
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*/
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#define REG_PIC REG_R10
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/* CONTROL register */
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#define CONTROL_FPCA (1 << 2) /* Bit 2: Floating-point context active */
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#define CONTROL_SPSEL (1 << 1) /* Bit 1: Stack-pointer select */
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#define CONTROL_NPRIV (1 << 0) /* Bit 0: Not privileged */
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/****************************************************************************
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* Public Types
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****************************************************************************/
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#ifndef __ASSEMBLY__
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/* This structure represents the return state from a system call */
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#ifdef CONFIG_LIB_SYSCALL
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struct xcpt_syscall_s
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{
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uint32_t excreturn; /* The EXC_RETURN value */
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uint32_t sysreturn; /* The return PC */
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};
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#endif
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/* The following structure is included in the TCB and defines the complete
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* state of the thread.
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*/
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struct xcptcontext
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{
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/* The following function pointer is non-zero if there
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* are pending signals to be processed.
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*/
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void *sigdeliver; /* Actual type is sig_deliver_t */
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/* These are saved copies of the context used during
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* signal processing.
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*/
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uint32_t *saved_regs;
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#ifdef CONFIG_BUILD_PROTECTED
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/* This is the saved address to use when returning from a user-space
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* signal handler.
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*/
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uint32_t sigreturn;
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#endif
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#ifdef CONFIG_LIB_SYSCALL
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/* The following array holds the return address and the exc_return value
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* needed to return from each nested system call.
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*/
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uint8_t nsyscalls;
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struct xcpt_syscall_s syscall[CONFIG_SYS_NNEST];
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#endif
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/* Register save area with XCPTCONTEXT_SIZE, only valid when:
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* 1.The task isn't running or
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* 2.The task is interrupted
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* otherwise task is running, and regs contain the stale value.
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*/
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uint32_t *regs;
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};
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#endif
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/****************************************************************************
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* Inline functions
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****************************************************************************/
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#ifndef __ASSEMBLY__
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/* Name: up_irq_save, up_irq_restore, and friends.
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*
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* NOTE: This function should never be called from application code and,
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* as a general rule unless you really know what you are doing, this
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* function should not be called directly from operation system code either:
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* Typically, the wrapper functions, enter_critical_section() and
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* leave_critical section(), are probably what you really want.
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*/
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/* Get/set the PRIMASK register */
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static inline uint8_t getprimask(void) inline_function;
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static inline uint8_t getprimask(void)
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{
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uint32_t primask;
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__asm__ __volatile__
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(
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"\tmrs %0, primask\n"
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: "=r" (primask)
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:
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: "memory");
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return (uint8_t)primask;
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}
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static inline void setprimask(uint32_t primask) inline_function;
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static inline void setprimask(uint32_t primask)
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{
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__asm__ __volatile__
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(
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"\tmsr primask, %0\n"
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:
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: "r" (primask)
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: "memory");
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}
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/* Disable IRQs */
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static inline void up_irq_disable(void) inline_function;
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static inline void up_irq_disable(void)
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{
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__asm__ __volatile__ ("\tcpsid i\n");
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}
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/* Save the current primask state & disable IRQs */
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static inline irqstate_t up_irq_save(void) inline_function;
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static inline irqstate_t up_irq_save(void)
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{
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unsigned short primask;
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/* Return the current value of primask register and set
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* bit 0 of the primask register to disable interrupts
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*/
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__asm__ __volatile__
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(
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"\tmrs %0, primask\n"
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"\tcpsid i\n"
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: "=r" (primask)
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:
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: "memory");
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return primask;
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}
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/* Enable IRQs */
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static inline void up_irq_enable(void) inline_function;
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static inline void up_irq_enable(void)
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{
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__asm__ __volatile__ ("\tcpsie i\n");
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}
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/* Restore saved primask state */
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static inline void up_irq_restore(irqstate_t flags) inline_function;
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static inline void up_irq_restore(irqstate_t flags)
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{
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/* If bit 0 of the primask is 0, then we need to restore
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* interrupts.
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*/
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__asm__ __volatile__
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(
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"\tmsr primask, %0\n"
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:
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: "r" (flags)
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: "memory");
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}
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/* Get/set IPSR */
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static inline uint32_t getipsr(void) inline_function;
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static inline uint32_t getipsr(void)
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{
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uint32_t ipsr;
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__asm__ __volatile__
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(
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"\tmrs %0, ipsr\n"
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: "=r" (ipsr)
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:
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: "memory");
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return ipsr;
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}
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/* Get/set CONTROL */
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static inline uint32_t getcontrol(void) inline_function;
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static inline uint32_t getcontrol(void)
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{
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uint32_t control;
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__asm__ __volatile__
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(
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"\tmrs %0, control\n"
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: "=r" (control)
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:
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: "memory");
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return control;
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}
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static inline void setcontrol(uint32_t control) inline_function;
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static inline void setcontrol(uint32_t control)
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{
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__asm__ __volatile__
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(
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"\tmsr control, %0\n"
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:
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: "r" (control)
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: "memory");
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}
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#endif /* __ASSEMBLY__ */
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/****************************************************************************
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* Public Data
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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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{
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#else
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#define EXTERN extern
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#endif
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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
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#endif /* __ARCH_ARM_INCLUDE_ARMV6_M_IRQ_H */
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