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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT 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/RT 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 <http://www.gnu.org/licenses/>.
*/
/**
* @file RC/STM8/chcore.h
* @brief STM8 architecture port macros and structures.
*
* @addtogroup STM8_CORE
* @{
*/
#ifndef _CHCORE_H_
#define _CHCORE_H_
#include <intrins.h>
/**
* @brief Unique macro for the implemented architecture.
*/
#define CH_ARCHITECTURE_STM8
/**
* @brief Name of the implemented architecture.
*/
#define CH_ARCHITECTURE_NAME "STM8"
/**
* @brief Base type for stack alignment.
* @note No alignment constraints so uint8_t.
*/
typedef uint8_t stkalign_t;
/**
* @brief Generic STM8 function pointer.
* @note It is used to allocate the proper size for return addresses in
* context-related structures.
*/
typedef void (*stm8func_t)(void);
/**
* @brief Interrupt saved context.
* @details This structure represents the stack frame saved during a
* preemption-capable interrupt handler.
* @note The structure requires one dummy field at its start because the
* stack is handled as preincremented/postdecremented.
*/
struct extctx {
uint8_t _next;
uint16_t cx;
uint16_t bx;
uint8_t cc;
uint8_t a;
uint16_t x;
uint16_t y;
uint8_t pce;
uint8_t pch;
uint8_t pcl;
};
/**
* @brief System saved context.
* @details This structure represents the inner stack frame during a context
* switching..
* @note The structure requires one dummy field at its start because the
* stack is handled as preincremented/postdecremented.
*/
struct intctx {
uint8_t _next;
stm8func_t pc; /* Function pointer sized return address. */
};
/**
* @brief Start context.
* @details This context is the stack organization for the trampoline code
* @p _port_thread_start().
*/
struct startctx {
uint8_t _next;
stm8func_t ts; /* Trampoline address. */
void *arg; /* Thread argument. */
stm8func_t pc; /* Thread function address. */
stm8func_t ret; /* chThdExit() address. */
};
/**
* @brief Platform dependent part of the @p Thread structure.
* @details This structure usually contains just the saved stack pointer
* defined as a pointer to a @p intctx structure.
*/
struct context {
struct intctx *sp;
};
/**
* @brief Platform dependent part of the @p chThdInit() API.
* @details This code usually setup the context switching frame represented
* by an @p intctx structure.
*/
#define SETUP_CONTEXT(workspace, wsize, pf, arg) { \
struct startctx *scp; \
scp = (struct startctx *)((uint8_t *)workspace + wsize - \
sizeof(struct startctx)); \
scp->ts = _port_thread_start; \
scp->arg = arg; \
scp->pc = (stm8func_t)pf; \
scp->ret = (stm8func_t)chThdExit; \
tp->p_ctx.sp = (struct intctx *)scp; \
}
/**
* @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 INT_REQUIRED_STACK.
*/
#ifndef IDLE_THREAD_STACK_SIZE
#define IDLE_THREAD_STACK_SIZE 0
#endif
/**
* @brief Per-thread stack overhead for interrupts servicing.
* @details This constant is used in the calculation of the correct working
* area size.
* This value can be zero on those architecture where there is a
* separate interrupt stack and the stack space between @p intctx and
* @p extctx is known to be zero.
*/
#ifndef INT_REQUIRED_STACK
#define INT_REQUIRED_STACK 32
#endif
/**
* @brief Enforces a correct alignment for a stack area size value.
*/
#define STACK_ALIGN(n) ((((n) - 1) | (sizeof(stkalign_t) - 1)) + 1)
/**
* @brief Computes the thread working area global size.
*/
#define THD_WA_SIZE(n) STACK_ALIGN(sizeof(Thread) + \
(sizeof(struct intctx) - 1) + \
(sizeof(struct extctx) - 1) + \
(n) + (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.
*/
#define WORKING_AREA(s, n) stkalign_t s[THD_WA_SIZE(n) / sizeof(stkalign_t)]
/**
* @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() { \
if (chSchIsRescRequiredExI()) \
chSchDoRescheduleI(); \
}
/**
* @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 irq##id(void) interrupt id
/**
* @brief Port-related initialization code.
* @note None in this port.
*/
#define port_init()
/**
* @brief Kernel-lock action.
* @note Implemented as global interrupts disable.
*/
#define port_lock() _sim_()
/**
* @brief Kernel-unlock action.
* @note Implemented as global interrupts enable.
*/
#define port_unlock() _rim_()
/**
* @brief Kernel-lock action from an interrupt handler.
* @note This function is empty in this port.
*/
#define port_lock_from_isr()
/**
* @brief Kernel-unlock action from an interrupt handler.
* @note This function is empty in this port.
*/
#define port_unlock_from_isr()
/**
* @brief Disables all the interrupt sources.
* @note Implemented as global interrupts disable.
* @note Of course non maskable interrupt sources are not included.
*/
#define port_disable() _sim_()
/**
* @brief Disables the interrupt sources that are not supposed to preempt
* the kernel.
* @note Same as @p port_disable() in this port, there is no difference
* between the two states.
*/
#define port_suspend() _sim_()
/**
* @brief Enables all the interrupt sources.
* @note Implemented as global interrupt enable.
*/
#define port_enable() _rim_()
/**
* @brief Enters an architecture-dependent halt mode.
* @note Implemented with the specific "wfi" instruction.
*/
#define port_wait_for_interrupt() _wfi_()
/**
* @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 Implemented as a call to a low level assembler routine.
*
* @param otp the thread to be switched out
* @param ntp the thread to be switched in
*/
#define port_switch(otp, ntp) _port_switch(otp)
#ifdef __cplusplus
extern "C" {
#endif
void port_halt(void);
void _port_switch(Thread *otp);
void _port_thread_start(void);
#ifdef __cplusplus
}
#endif
#endif /* _CHCORE_H_ */
/** @} */
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