/*
ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio.
This file is part of ChibiOS.
ChibiOS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
ChibiOS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see .
*/
/**
* @file chcore_v7m.h
* @brief ARMv7-M architecture port macros and structures.
*
* @addtogroup ARMCMx_V7M_CORE
* @{
*/
#ifndef CHCORE_V7M_H
#define CHCORE_V7M_H
/*===========================================================================*/
/* Module constants. */
/*===========================================================================*/
/**
* @name Port Capabilities and Constants
* @{
*/
/**
* @brief This port supports a realtime counter.
*/
#define PORT_SUPPORTS_RT TRUE
/**
* @brief Natural alignment constant.
* @note It is the minimum alignment for pointer-size variables.
*/
#define PORT_NATURAL_ALIGN sizeof (void *)
/**
* @brief Stack alignment constant.
* @note It is the alignement required for the stack pointer.
*/
#define PORT_STACK_ALIGN sizeof (stkalign_t)
/**
* @brief Working Areas alignment constant.
* @note It is the alignment to be enforced for thread working areas.
*/
#define PORT_WORKING_AREA_ALIGN (PORT_ENABLE_GUARD_PAGES == TRUE ? \
32U : PORT_STACK_ALIGN)
/** @} */
/**
* @brief Disabled value for BASEPRI register.
*/
#define CORTEX_BASEPRI_DISABLED 0U
/*===========================================================================*/
/* Module pre-compile time settings. */
/*===========================================================================*/
/**
* @brief Enables stack overflow guard pages using MPU.
* @note This option can only be enabled if also option
* @p CH_DBG_ENABLE_STACK_CHECK is enabled.
* @note The use of this option has an overhead of 32 bytes for each
* thread.
*/
#if !defined(PORT_ENABLE_GUARD_PAGES) || defined(__DOXYGEN__)
#define PORT_ENABLE_GUARD_PAGES FALSE
#endif
/**
* @brief Stack size for the system idle thread.
* @details This size depends on the idle thread implementation, usually
* the idle thread should take no more space than those reserved
* by @p PORT_INT_REQUIRED_STACK.
* @note In this port it is set to 16 because the idle thread does have
* a stack frame when compiling without optimizations. You may
* reduce this value to zero when compiling with optimizations.
*/
#if !defined(PORT_IDLE_THREAD_STACK_SIZE) || defined(__DOXYGEN__)
#define PORT_IDLE_THREAD_STACK_SIZE 16
#endif
/**
* @brief Per-thread stack overhead for interrupts servicing.
* @details This constant is used in the calculation of the correct working
* area size.
* @note In this port this value is conservatively set to 64 because the
* function @p chSchDoReschedule() can have a stack frame, especially
* with compiler optimizations disabled. The value can be reduced
* when compiler optimizations are enabled.
*/
#if !defined(PORT_INT_REQUIRED_STACK) || defined(__DOXYGEN__)
#define PORT_INT_REQUIRED_STACK 64
#endif
/**
* @brief Enables the use of the WFI instruction in the idle thread loop.
*/
#if !defined(CORTEX_ENABLE_WFI_IDLE)
#define CORTEX_ENABLE_WFI_IDLE FALSE
#endif
/**
* @brief FPU support in context switch.
* @details Activating this option activates the FPU support in the kernel.
*/
#if !defined(CORTEX_USE_FPU)
#define CORTEX_USE_FPU CORTEX_HAS_FPU
#elif (CORTEX_USE_FPU == TRUE) && (CORTEX_HAS_FPU == FALSE)
/* This setting requires an FPU presence check in case it is externally
redefined.*/
#error "the selected core does not have an FPU"
#endif
/**
* @brief Simplified priority handling flag.
* @details Activating this option makes the Kernel work in compact mode.
* In compact mode interrupts are disabled globally instead of
* raising the priority mask to some intermediate level.
*/
#if !defined(CORTEX_SIMPLIFIED_PRIORITY)
#define CORTEX_SIMPLIFIED_PRIORITY FALSE
#endif
/**
* @brief SVCALL handler priority.
* @note The default SVCALL handler priority is defaulted to
* @p CORTEX_MAXIMUM_PRIORITY+1, this reserves the
* @p CORTEX_MAXIMUM_PRIORITY priority level as fast interrupts
* priority level.
*/
#if !defined(CORTEX_PRIORITY_SVCALL)
#define CORTEX_PRIORITY_SVCALL (CORTEX_MAXIMUM_PRIORITY + 1U)
#elif !PORT_IRQ_IS_VALID_PRIORITY(CORTEX_PRIORITY_SVCALL)
/* If it is externally redefined then better perform a validity check on it.*/
#error "invalid priority level specified for CORTEX_PRIORITY_SVCALL"
#endif
/**
* @brief NVIC VTOR initialization expression.
*/
#if !defined(CORTEX_VTOR_INIT) || defined(__DOXYGEN__)
#define CORTEX_VTOR_INIT 0x00000000U
#endif
/**
* @brief NVIC PRIGROUP initialization expression.
* @details The default assigns all available priority bits as preemption
* priority with no sub-priority.
*/
#if !defined(CORTEX_PRIGROUP_INIT) || defined(__DOXYGEN__)
#define CORTEX_PRIGROUP_INIT (7 - CORTEX_PRIORITY_BITS)
#endif
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
#if !defined(_FROM_ASM_)
/**
* @brief MPU guard page size.
*/
#if (PORT_ENABLE_GUARD_PAGES == TRUE) || defined(__DOXYGEN__)
#if CH_DBG_ENABLE_STACK_CHECK == FALSE
#error "PORT_ENABLE_GUARD_PAGES requires CH_DBG_ENABLE_STACK_CHECK"
#endif
#if __MPU_PRESENT == 0
#error "MPU not present in current device"
#endif
#define PORT_GUARD_PAGE_SIZE 32U
#else
#define PORT_GUARD_PAGE_SIZE 0U
#endif
#endif /* !defined(_FROM_ASM_) */
/**
* @name Architecture and Compiler
* @{
*/
#if (CORTEX_MODEL == 3) || defined(__DOXYGEN__)
/**
* @brief Macro defining the specific ARM architecture.
*/
#define PORT_ARCHITECTURE_ARM_v7M
/**
* @brief Name of the implemented architecture.
*/
#define PORT_ARCHITECTURE_NAME "ARMv7-M"
/**
* @brief Name of the architecture variant.
*/
#if (PORT_ENABLE_GUARD_PAGES == FALSE) || defined(__DOXYGEN__)
#define PORT_CORE_VARIANT_NAME "Cortex-M3"
#else
#define PORT_CORE_VARIANT_NAME "Cortex-M3 (MPU)"
#endif
#elif (CORTEX_MODEL == 4)
#define PORT_ARCHITECTURE_ARM_v7ME
#define PORT_ARCHITECTURE_NAME "ARMv7E-M"
#if CORTEX_USE_FPU
#if PORT_ENABLE_GUARD_PAGES == FALSE
#define PORT_CORE_VARIANT_NAME "Cortex-M4F"
#else
#define PORT_CORE_VARIANT_NAME "Cortex-M4F (MPU)"
#endif
#else
#if PORT_ENABLE_GUARD_PAGES == FALSE
#define PORT_CORE_VARIANT_NAME "Cortex-M4"
#else
#define PORT_CORE_VARIANT_NAME "Cortex-M4 (MPU)"
#endif
#endif
#elif (CORTEX_MODEL == 7)
#define PORT_ARCHITECTURE_ARM_v7ME
#define PORT_ARCHITECTURE_NAME "ARMv7E-M"
#if CORTEX_USE_FPU
#if PORT_ENABLE_GUARD_PAGES == FALSE
#define PORT_CORE_VARIANT_NAME "Cortex-M7F"
#else
#define PORT_CORE_VARIANT_NAME "Cortex-M7F (MPU)"
#endif
#else
#if PORT_ENABLE_GUARD_PAGES == FALSE
#define PORT_CORE_VARIANT_NAME "Cortex-M7"
#else
#define PORT_CORE_VARIANT_NAME "Cortex-M7 (MPU)"
#endif
#endif
#endif
/**
* @brief Port-specific information string.
*/
#if (CORTEX_SIMPLIFIED_PRIORITY == FALSE) || defined(__DOXYGEN__)
#define PORT_INFO "Advanced kernel mode"
#else
#define PORT_INFO "Compact kernel mode"
#endif
/** @} */
#if (CORTEX_SIMPLIFIED_PRIORITY == FALSE) || defined(__DOXYGEN__)
/**
* @brief Maximum usable priority for normal ISRs.
*/
#define CORTEX_MAX_KERNEL_PRIORITY (CORTEX_PRIORITY_SVCALL + 1U)
/**
* @brief BASEPRI level within kernel lock.
*/
#define CORTEX_BASEPRI_KERNEL \
CORTEX_PRIO_MASK(CORTEX_MAX_KERNEL_PRIORITY)
#else
#define CORTEX_MAX_KERNEL_PRIORITY 0U
#endif
/**
* @brief PendSV priority level.
* @note This priority is enforced to be equal to
* @p CORTEX_MAX_KERNEL_PRIORITY, this handler always have the
* highest priority that cannot preempt the kernel.
*/
#define CORTEX_PRIORITY_PENDSV CORTEX_MAX_KERNEL_PRIORITY
/*===========================================================================*/
/* Module data structures and types. */
/*===========================================================================*/
/* The following code is not processed when the file is included from an
asm module.*/
#if !defined(_FROM_ASM_)
/* The documentation of the following declarations is in chconf.h in order
to not have duplicated structure names into the documentation.*/
#if !defined(__DOXYGEN__)
struct port_extctx {
regarm_t r0;
regarm_t r1;
regarm_t r2;
regarm_t r3;
regarm_t r12;
regarm_t lr_thd;
regarm_t pc;
regarm_t xpsr;
#if CORTEX_USE_FPU
regarm_t s0;
regarm_t s1;
regarm_t s2;
regarm_t s3;
regarm_t s4;
regarm_t s5;
regarm_t s6;
regarm_t s7;
regarm_t s8;
regarm_t s9;
regarm_t s10;
regarm_t s11;
regarm_t s12;
regarm_t s13;
regarm_t s14;
regarm_t s15;
regarm_t fpscr;
regarm_t reserved;
#endif /* CORTEX_USE_FPU */
};
struct port_intctx {
#if CORTEX_USE_FPU
regarm_t s16;
regarm_t s17;
regarm_t s18;
regarm_t s19;
regarm_t s20;
regarm_t s21;
regarm_t s22;
regarm_t s23;
regarm_t s24;
regarm_t s25;
regarm_t s26;
regarm_t s27;
regarm_t s28;
regarm_t s29;
regarm_t s30;
regarm_t s31;
#endif /* CORTEX_USE_FPU */
regarm_t r4;
regarm_t r5;
regarm_t r6;
regarm_t r7;
regarm_t r8;
regarm_t r9;
regarm_t r10;
regarm_t r11;
regarm_t lr;
};
#endif /* !defined(__DOXYGEN__) */
/*===========================================================================*/
/* Module macros. */
/*===========================================================================*/
/**
* @brief Platform dependent part of the @p chThdCreateI() API.
* @details This code usually setup the context switching frame represented
* by an @p port_intctx structure.
*/
#define PORT_SETUP_CONTEXT(tp, wbase, wtop, pf, arg) { \
(tp)->ctx.sp = (struct port_intctx *)((uint8_t *)(wtop) - \
sizeof (struct port_intctx)); \
(tp)->ctx.sp->r4 = (regarm_t)(pf); \
(tp)->ctx.sp->r5 = (regarm_t)(arg); \
(tp)->ctx.sp->lr = (regarm_t)_port_thread_start; \
}
/**
* @brief Computes the thread working area global size.
* @note There is no need to perform alignments in this macro.
*/
#define PORT_WA_SIZE(n) ((size_t)PORT_GUARD_PAGE_SIZE + \
sizeof (struct port_intctx) + \
sizeof (struct port_extctx) + \
(size_t)(n) + \
(size_t)PORT_INT_REQUIRED_STACK)
/**
* @brief Static working area allocation.
* @details This macro is used to allocate a static thread working area
* aligned as both position and size.
*
* @param[in] s the name to be assigned to the stack array
* @param[in] n the stack size to be assigned to the thread
*/
#if (PORT_ENABLE_GUARD_PAGES == FALSE) || defined(__DOXYGEN__)
#define PORT_WORKING_AREA(s, n) \
stkalign_t s[THD_WORKING_AREA_SIZE(n) / sizeof (stkalign_t)]
#else
#define PORT_WORKING_AREA(s, n) \
ALIGNED_VAR(32) stkalign_t s[THD_WORKING_AREA_SIZE(n) / sizeof (stkalign_t)]
#endif
/**
* @brief IRQ prologue code.
* @details This macro must be inserted at the start of all IRQ handlers
* enabled to invoke system APIs.
*/
#define PORT_IRQ_PROLOGUE()
/**
* @brief IRQ epilogue code.
* @details This macro must be inserted at the end of all IRQ handlers
* enabled to invoke system APIs.
*/
#define PORT_IRQ_EPILOGUE() _port_irq_epilogue()
/**
* @brief IRQ handler function declaration.
* @note @p id can be a function name or a vector number depending on the
* port implementation.
*/
#define PORT_IRQ_HANDLER(id) void id(void)
/**
* @brief Fast IRQ handler function declaration.
* @note @p id can be a function name or a vector number depending on the
* port implementation.
*/
#define PORT_FAST_IRQ_HANDLER(id) void id(void)
/**
* @brief Performs a context switch between two threads.
* @details This is the most critical code in any port, this function
* is responsible for the context switch between 2 threads.
* @note The implementation of this code affects directly the context
* switch performance so optimize here as much as you can.
*
* @param[in] ntp the thread to be switched in
* @param[in] otp the thread to be switched out
*/
#if (CH_DBG_ENABLE_STACK_CHECK == FALSE) || defined(__DOXYGEN__)
#define port_switch(ntp, otp) _port_switch(ntp, otp)
#else
#if PORT_ENABLE_GUARD_PAGES == FALSE
#define port_switch(ntp, otp) { \
struct port_intctx *r13 = (struct port_intctx *)__get_PSP(); \
if ((stkalign_t *)(r13 - 1) < (otp)->wabase) { \
chSysHalt("stack overflow"); \
} \
_port_switch(ntp, otp); \
}
#else
#define port_switch(ntp, otp) { \
_port_switch(ntp, otp); \
\
/* Setting up the guard page for the switched-in thread.*/ \
mpuConfigureRegion(MPU_REGION_0, \
chThdGetSelfX()->wabase, \
MPU_RASR_ATTR_AP_NA_NA | \
MPU_RASR_ATTR_NON_CACHEABLE | \
MPU_RASR_SIZE_32 | \
MPU_RASR_ENABLE); \
}
#endif
#endif
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
void _port_irq_epilogue(void);
void _port_switch(thread_t *ntp, thread_t *otp);
void _port_thread_start(void);
void _port_switch_from_isr(void);
void _port_exit_from_isr(void);
#ifdef __cplusplus
}
#endif
/*===========================================================================*/
/* Module inline functions. */
/*===========================================================================*/
/**
* @brief Port-related initialization code.
*/
static inline void port_init(void) {
/* Initialization of the vector table and priority related settings.*/
SCB->VTOR = CORTEX_VTOR_INIT;
/* Initializing priority grouping.*/
NVIC_SetPriorityGrouping(CORTEX_PRIGROUP_INIT);
/* DWT cycle counter enable, note, the M7 requires DWT unlocking.*/
CoreDebug->DEMCR |= CoreDebug_DEMCR_TRCENA_Msk;
#if CORTEX_MODEL == 7
DWT->LAR = 0xC5ACCE55U;
#endif
DWT->CTRL |= DWT_CTRL_CYCCNTENA_Msk;
/* Initialization of the system vectors used by the port.*/
#if CORTEX_SIMPLIFIED_PRIORITY == FALSE
NVIC_SetPriority(SVCall_IRQn, CORTEX_PRIORITY_SVCALL);
#endif
NVIC_SetPriority(PendSV_IRQn, CORTEX_PRIORITY_PENDSV);
#if PORT_ENABLE_GUARD_PAGES == TRUE
{
extern stkalign_t __main_thread_stack_base__;
/* Setting up the guard page on the main() function stack base
initially.*/
mpuConfigureRegion(MPU_REGION_0,
&__main_thread_stack_base__,
MPU_RASR_ATTR_AP_NA_NA |
MPU_RASR_ATTR_NON_CACHEABLE |
MPU_RASR_SIZE_32 |
MPU_RASR_ENABLE);
/* MPU is enabled.*/
mpuEnable(MPU_CTRL_PRIVDEFENA);
}
#endif
}
/**
* @brief Returns a word encoding the current interrupts status.
*
* @return The interrupts status.
*/
static inline syssts_t port_get_irq_status(void) {
syssts_t sts;
#if CORTEX_SIMPLIFIED_PRIORITY == FALSE
sts = (syssts_t)__get_BASEPRI();
#else /* CORTEX_SIMPLIFIED_PRIORITY */
sts = (syssts_t)__get_PRIMASK();
#endif /* CORTEX_SIMPLIFIED_PRIORITY */
return sts;
}
/**
* @brief Checks the interrupt status.
*
* @param[in] sts the interrupt status word
*
* @return The interrupt status.
* @retval false the word specified a disabled interrupts status.
* @retval true the word specified an enabled interrupts status.
*/
static inline bool port_irq_enabled(syssts_t sts) {
#if CORTEX_SIMPLIFIED_PRIORITY == FALSE
return sts == (syssts_t)CORTEX_BASEPRI_DISABLED;
#else /* CORTEX_SIMPLIFIED_PRIORITY */
return (sts & (syssts_t)1) == (syssts_t)0;
#endif /* CORTEX_SIMPLIFIED_PRIORITY */
}
/**
* @brief Determines the current execution context.
*
* @return The execution context.
* @retval false not running in ISR mode.
* @retval true running in ISR mode.
*/
static inline bool port_is_isr_context(void) {
return (bool)((__get_IPSR() & 0x1FFU) != 0U);
}
/**
* @brief Kernel-lock action.
* @details In this port this function raises the base priority to kernel
* level.
*/
static inline void port_lock(void) {
#if CORTEX_SIMPLIFIED_PRIORITY == FALSE
#if defined(__CM7_REV)
#if __CM7_REV <= 1
__disable_irq();
#endif
#endif
__set_BASEPRI(CORTEX_BASEPRI_KERNEL);
#if defined(__CM7_REV)
#if __CM7_REV <= 1
__enable_irq();
#endif
#endif
#else /* CORTEX_SIMPLIFIED_PRIORITY */
__disable_irq();
#endif /* CORTEX_SIMPLIFIED_PRIORITY */
}
/**
* @brief Kernel-unlock action.
* @details In this port this function lowers the base priority to user
* level.
*/
static inline void port_unlock(void) {
#if CORTEX_SIMPLIFIED_PRIORITY == FALSE
__set_BASEPRI(CORTEX_BASEPRI_DISABLED);
#else /* CORTEX_SIMPLIFIED_PRIORITY */
__enable_irq();
#endif /* CORTEX_SIMPLIFIED_PRIORITY */
}
/**
* @brief Kernel-lock action from an interrupt handler.
* @details In this port this function raises the base priority to kernel
* level.
* @note Same as @p port_lock() in this port.
*/
static inline void port_lock_from_isr(void) {
port_lock();
}
/**
* @brief Kernel-unlock action from an interrupt handler.
* @details In this port this function lowers the base priority to user
* level.
* @note Same as @p port_unlock() in this port.
*/
static inline void port_unlock_from_isr(void) {
port_unlock();
}
/**
* @brief Disables all the interrupt sources.
* @note In this port it disables all the interrupt sources by raising
* the priority mask to level 0.
*/
static inline void port_disable(void) {
__disable_irq();
}
/**
* @brief Disables the interrupt sources below kernel-level priority.
* @note Interrupt sources above kernel level remains enabled.
* @note In this port it raises/lowers the base priority to kernel level.
*/
static inline void port_suspend(void) {
#if (CORTEX_SIMPLIFIED_PRIORITY == FALSE) || defined(__DOXYGEN__)
__set_BASEPRI(CORTEX_BASEPRI_KERNEL);
__enable_irq();
#else
__disable_irq();
#endif
}
/**
* @brief Enables all the interrupt sources.
* @note In this port it lowers the base priority to user level.
*/
static inline void port_enable(void) {
#if (CORTEX_SIMPLIFIED_PRIORITY == FALSE) || defined(__DOXYGEN__)
__set_BASEPRI(CORTEX_BASEPRI_DISABLED);
#endif
__enable_irq();
}
/**
* @brief Enters an architecture-dependent IRQ-waiting mode.
* @details The function is meant to return when an interrupt becomes pending.
* The simplest implementation is an empty function or macro but this
* would not take advantage of architecture-specific power saving
* modes.
* @note Implemented as an inlined @p WFI instruction.
*/
static inline void port_wait_for_interrupt(void) {
#if CORTEX_ENABLE_WFI_IDLE == TRUE
__WFI();
#endif
}
/**
* @brief Returns the current value of the realtime counter.
*
* @return The realtime counter value.
*/
static inline rtcnt_t port_rt_get_counter_value(void) {
return DWT->CYCCNT;
}
#endif /* !defined(_FROM_ASM_) */
#endif /* CHCORE_V7M_H */
/** @} */