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ChibiOS/os/rt/ports/SIMIA32/chcore.h

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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013,2014 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 SIMIA32/chcore.h
* @brief Simulator on IA32 port macros and structures.
*
* @addtogroup SIMIA32_GCC_CORE
* @{
*/
#ifndef _CHCORE_H_
#define _CHCORE_H_
/*===========================================================================*/
/* Module constants. */
/*===========================================================================*/
/**
* Macro defining the a simulated architecture into x86.
*/
#define PORT_ARCHITECTURE_SIMIA32
/**
* Name of the implemented architecture.
*/
#define PORT_ARCHITECTURE_NAME "Simulator"
/**
* @brief Name of the architecture variant (optional).
*/
#define PORT_CORE_VARIANT_NAME "x86 (integer only)"
/**
* @brief Name of the compiler supported by this port.
*/
#define PORT_COMPILER_NAME "GCC " __VERSION__
/**
* @brief Port-specific information string.
*/
#define PORT_INFO "No preemption"
/**
* @brief This port supports a realtime counter.
*/
#define PORT_SUPPORTS_RT FALSE
/*===========================================================================*/
/* Module pre-compile time settings. */
/*===========================================================================*/
/**
* @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.
*/
#ifndef PORT_IDLE_THREAD_STACK_SIZE
#define PORT_IDLE_THREAD_STACK_SIZE 256
#endif
/**
* @brief Per-thread stack overhead for interrupts servicing.
* @details This constant is used in the calculation of the correct working
* area size.
*/
#ifndef PORT_INT_REQUIRED_STACK
#define PORT_INT_REQUIRED_STACK 16384
#endif
/**
* @brief Enables an alternative timer implementation.
* @details Usually the port uses a timer interface defined in the file
* @p chcore_timer.h, if this option is enabled then the file
* @p chcore_timer_alt.h is included instead.
*/
#if !defined(PORT_USE_ALT_TIMER)
#define PORT_USE_ALT_TIMER FALSE
#endif
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
#if CH_DBG_ENABLE_STACK_CHECK
#error "option CH_DBG_ENABLE_STACK_CHECK not supported by this port"
#endif
/*===========================================================================*/
/* Module data structures and types. */
/*===========================================================================*/
/**
* @brief 16 bytes stack and memory alignment enforcement.
*/
typedef struct {
uint8_t a[16];
} stkalign_t __attribute__((aligned(16)));
/**
* @brief Type of a generic x86 register.
*/
typedef void *regx86;
/**
* @brief Interrupt saved context.
* @details This structure represents the stack frame saved during a
* preemption-capable interrupt handler.
*/
struct port_extctx {
};
/**
* @brief System saved context.
* @details This structure represents the inner stack frame during a context
* switch.
*/
struct port_intctx {
regx86 ebx;
regx86 edi;
regx86 esi;
regx86 ebp;
regx86 eip;
};
/**
* @brief Platform dependent part of the @p thread_t structure.
* @details In this port the structure just holds a pointer to the
* @p port_intctx structure representing the stack pointer
* at context switch time.
*/
struct context {
struct port_intctx *esp;
};
/*===========================================================================*/
/* Module macros. */
/*===========================================================================*/
#define APUSH(p, a) (p) -= sizeof(void *), *(void **)(p) = (void*)(a)
/* Darwin requires the stack to be aligned to a 16-byte boundary at
* the time of a call instruction (in case the called function needs
* to save MMX registers). This aligns to 'mod' module 16, so that we'll end
* up with the right alignment after pushing the args. */
#define AALIGN(p, mask, mod) p = (void *)((((uintptr_t)(p) - mod) & ~mask) + mod)
/**
* @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, workspace, wsize, pf, arg) { \
uint8_t *esp = (uint8_t *)workspace + wsize; \
APUSH(esp, 0); \
uint8_t *savebp = esp; \
AALIGN(esp, 15, 8); \
APUSH(esp, arg); \
APUSH(esp, pf); \
APUSH(esp, 0); \
esp -= sizeof(struct port_intctx); \
((struct port_intctx *)esp)->eip = (void *)_port_thread_start; \
((struct port_intctx *)esp)->ebx = 0; \
((struct port_intctx *)esp)->edi = 0; \
((struct port_intctx *)esp)->esi = 0; \
((struct port_intctx *)esp)->ebp = (void *)savebp; \
(tp)->p_ctx.esp = (struct port_intctx *)esp; \
}
/**
* @brief Computes the thread working area global size.
* @note There is no need to perform alignments in this macro.
*/
#define PORT_WA_SIZE(n) (sizeof(void *) * 4 + \
sizeof(struct port_intctx) + \
sizeof(struct port_extctx) + \
(n) + \
PORT_INT_REQUIRED_STACK)
/**
* @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()
/**
* @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)
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
#ifdef __cplusplus
extern "C" {
#endif
__attribute__((fastcall)) void port_switch(thread_t *ntp, thread_t *otp);
__attribute__((cdecl, noreturn)) void _port_thread_start(msg_t (*pf)(void *),
void *p);
void _sim_check_for_interrupts(void);
#ifdef __cplusplus
}
#endif
/*===========================================================================*/
/* Module inline functions. */
/*===========================================================================*/
/**
* @brief Port-related initialization code.
*/
static inline void port_init(void) {
}
/**
* @brief Returns a word encoding the current interrupts status.
*
* @return The interrupts status.
*/
static inline syssts_t port_get_irq_status(void) {
return (syssts_t)0;
}
/**
* @brief Checks the interrupt status.
*
* @param[in] sts the interrupt status word
*
* @return The interrupt status.
* @retvel false the word specified a disabled interrupts status.
* @retvel true the word specified an enabled interrupts status.
*/
static inline bool port_irq_enabled(syssts_t sts) {
return (sts & 1) == 0;
}
/**
* @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 false;
}
/**
* @brief Kernel-lock action.
* @details In this port this function disables interrupts globally.
*/
static inline void port_lock(void) {
asm volatile("nop");
}
/**
* @brief Kernel-unlock action.
* @details In this port this function enables interrupts globally.
*/
static inline void port_unlock(void) {
asm volatile("nop");
}
/**
* @brief Kernel-lock action from an interrupt handler.
* @details In this port this function disables interrupts globally.
* @note Same as @p port_lock() in this port.
*/
static inline void port_lock_from_isr(void) {
asm volatile("nop");
}
/**
* @brief Kernel-unlock action from an interrupt handler.
* @details In this port this function enables interrupts globally.
* @note Same as @p port_lock() in this port.
*/
static inline void port_unlock_from_isr(void) {
asm volatile("nop");
}
/**
* @brief Disables all the interrupt sources.
*/
static inline void port_disable(void) {
asm volatile("nop");
}
/**
* @brief Disables the interrupt sources below kernel-level priority.
*/
static inline void port_suspend(void) {
asm volatile("nop");
}
/**
* @brief Enables all the interrupt sources.
*/
static inline void port_enable(void) {
asm volatile("nop");
}
/**
* @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) {
_sim_check_for_interrupts();
}
#endif /* _CHCORE_H_ */
/** @} */
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