366 lines
12 KiB
C
366 lines
12 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012,2013,2014 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file SIMIA32/chcore.h
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* @brief Simulator on IA32 port macros and structures.
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*
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* @addtogroup SIMIA32_GCC_CORE
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* @{
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*/
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#ifndef _CHCORE_H_
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#define _CHCORE_H_
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/*===========================================================================*/
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/* Module constants. */
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/*===========================================================================*/
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/**
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* Macro defining the a simulated architecture into x86.
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*/
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#define PORT_ARCHITECTURE_SIMIA32
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/**
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* Name of the implemented architecture.
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*/
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#define PORT_ARCHITECTURE_NAME "Simulator"
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/**
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* @brief Name of the architecture variant (optional).
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*/
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#define PORT_CORE_VARIANT_NAME "x86 (integer only)"
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/**
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* @brief Name of the compiler supported by this port.
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*/
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#define PORT_COMPILER_NAME "GCC " __VERSION__
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/**
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* @brief Port-specific information string.
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*/
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#define PORT_INFO "No preemption"
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/**
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* @brief This port supports a realtime counter.
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*/
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#define PORT_SUPPORTS_RT FALSE
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/*===========================================================================*/
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/* Module pre-compile time settings. */
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/*===========================================================================*/
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/**
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* @brief Stack size for the system idle thread.
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* @details This size depends on the idle thread implementation, usually
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* the idle thread should take no more space than those reserved
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* by @p PORT_INT_REQUIRED_STACK.
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*/
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#ifndef PORT_IDLE_THREAD_STACK_SIZE
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#define PORT_IDLE_THREAD_STACK_SIZE 256
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#endif
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/**
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* @brief Per-thread stack overhead for interrupts servicing.
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* @details This constant is used in the calculation of the correct working
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* area size.
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*/
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#ifndef PORT_INT_REQUIRED_STACK
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#define PORT_INT_REQUIRED_STACK 16384
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#endif
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/**
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* @brief Enables an alternative timer implementation.
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* @details Usually the port uses a timer interface defined in the file
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* @p chcore_timer.h, if this option is enabled then the file
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* @p chcore_timer_alt.h is included instead.
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*/
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#if !defined(PORT_USE_ALT_TIMER)
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#define PORT_USE_ALT_TIMER FALSE
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#endif
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/*===========================================================================*/
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/* Derived constants and error checks. */
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/*===========================================================================*/
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#if CH_DBG_ENABLE_STACK_CHECK
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#error "option CH_DBG_ENABLE_STACK_CHECK not supported by this port"
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#endif
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/*===========================================================================*/
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/* Module data structures and types. */
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/*===========================================================================*/
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/**
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* @brief 16 bytes stack and memory alignment enforcement.
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*/
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typedef struct {
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uint8_t a[16];
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} stkalign_t __attribute__((aligned(16)));
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/**
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* @brief Type of a generic x86 register.
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*/
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typedef void *regx86;
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/**
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* @brief Interrupt saved context.
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* @details This structure represents the stack frame saved during a
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* preemption-capable interrupt handler.
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*/
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struct port_extctx {
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};
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/**
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* @brief System saved context.
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* @details This structure represents the inner stack frame during a context
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* switch.
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*/
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struct port_intctx {
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regx86 ebx;
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regx86 edi;
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regx86 esi;
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regx86 ebp;
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regx86 eip;
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};
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/**
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* @brief Platform dependent part of the @p thread_t structure.
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* @details In this port the structure just holds a pointer to the
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* @p port_intctx structure representing the stack pointer
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* at context switch time.
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*/
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struct context {
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struct port_intctx *esp;
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};
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/*===========================================================================*/
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/* Module macros. */
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/*===========================================================================*/
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#define APUSH(p, a) (p) -= sizeof(void *), *(void **)(p) = (void*)(a)
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/* Darwin requires the stack to be aligned to a 16-byte boundary at
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* the time of a call instruction (in case the called function needs
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* to save MMX registers). This aligns to 'mod' module 16, so that we'll end
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* up with the right alignment after pushing the args. */
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#define AALIGN(p, mask, mod) p = (void *)((((uintptr_t)(p) - mod) & ~mask) + mod)
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/**
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* @brief Platform dependent part of the @p chThdCreateI() API.
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* @details This code usually setup the context switching frame represented
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* by an @p port_intctx structure.
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*/
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#define PORT_SETUP_CONTEXT(tp, workspace, wsize, pf, arg) { \
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uint8_t *esp = (uint8_t *)workspace + wsize; \
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APUSH(esp, 0); \
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uint8_t *savebp = esp; \
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AALIGN(esp, 15, 8); \
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APUSH(esp, arg); \
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APUSH(esp, pf); \
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APUSH(esp, 0); \
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esp -= sizeof(struct port_intctx); \
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((struct port_intctx *)esp)->eip = (void *)_port_thread_start; \
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((struct port_intctx *)esp)->ebx = 0; \
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((struct port_intctx *)esp)->edi = 0; \
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((struct port_intctx *)esp)->esi = 0; \
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((struct port_intctx *)esp)->ebp = (void *)savebp; \
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(tp)->p_ctx.esp = (struct port_intctx *)esp; \
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}
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/**
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* @brief Computes the thread working area global size.
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* @note There is no need to perform alignments in this macro.
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*/
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#define PORT_WA_SIZE(n) (sizeof(void *) * 4 + \
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sizeof(struct port_intctx) + \
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sizeof(struct port_extctx) + \
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(n) + \
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PORT_INT_REQUIRED_STACK)
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/**
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* @brief IRQ prologue code.
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* @details This macro must be inserted at the start of all IRQ handlers
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* enabled to invoke system APIs.
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*/
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#define PORT_IRQ_PROLOGUE()
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/**
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* @brief IRQ epilogue code.
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* @details This macro must be inserted at the end of all IRQ handlers
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* enabled to invoke system APIs.
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*/
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#define PORT_IRQ_EPILOGUE()
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/**
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* @brief IRQ handler function declaration.
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* @note @p id can be a function name or a vector number depending on the
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* port implementation.
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*/
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#define PORT_IRQ_HANDLER(id) void id(void)
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/**
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* @brief Fast IRQ handler function declaration.
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* @note @p id can be a function name or a vector number depending on the
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* port implementation.
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*/
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#define PORT_FAST_IRQ_HANDLER(id) void id(void)
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/*===========================================================================*/
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/* External declarations. */
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/*===========================================================================*/
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#ifdef __cplusplus
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extern "C" {
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#endif
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__attribute__((fastcall)) void port_switch(thread_t *ntp, thread_t *otp);
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__attribute__((cdecl, noreturn)) void _port_thread_start(msg_t (*pf)(void *),
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void *p);
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void _sim_check_for_interrupts(void);
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#ifdef __cplusplus
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}
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#endif
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/*===========================================================================*/
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/* Module inline functions. */
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/*===========================================================================*/
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/**
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* @brief Port-related initialization code.
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*/
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static inline void port_init(void) {
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}
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/**
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* @brief Returns a word encoding the current interrupts status.
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*
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* @return The interrupts status.
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*/
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static inline syssts_t port_get_irq_status(void) {
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return (syssts_t)0;
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}
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/**
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* @brief Checks the interrupt status.
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*
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* @param[in] sts the interrupt status word
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*
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* @return The interrupt status.
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* @retvel false the word specified a disabled interrupts status.
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* @retvel true the word specified an enabled interrupts status.
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*/
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static inline bool port_irq_enabled(syssts_t sts) {
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return (sts & 1) == 0;
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}
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/**
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* @brief Determines the current execution context.
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*
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* @return The execution context.
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* @retval false not running in ISR mode.
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* @retval true running in ISR mode.
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*/
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static inline bool port_is_isr_context(void) {
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return false;
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}
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/**
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* @brief Kernel-lock action.
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* @details In this port this function disables interrupts globally.
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*/
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static inline void port_lock(void) {
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asm volatile("nop");
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}
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/**
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* @brief Kernel-unlock action.
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* @details In this port this function enables interrupts globally.
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*/
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static inline void port_unlock(void) {
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asm volatile("nop");
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}
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/**
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* @brief Kernel-lock action from an interrupt handler.
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* @details In this port this function disables interrupts globally.
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* @note Same as @p port_lock() in this port.
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*/
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static inline void port_lock_from_isr(void) {
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asm volatile("nop");
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}
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/**
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* @brief Kernel-unlock action from an interrupt handler.
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* @details In this port this function enables interrupts globally.
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* @note Same as @p port_lock() in this port.
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*/
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static inline void port_unlock_from_isr(void) {
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asm volatile("nop");
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}
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/**
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* @brief Disables all the interrupt sources.
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*/
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static inline void port_disable(void) {
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asm volatile("nop");
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}
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/**
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* @brief Disables the interrupt sources below kernel-level priority.
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*/
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static inline void port_suspend(void) {
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asm volatile("nop");
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}
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/**
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* @brief Enables all the interrupt sources.
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*/
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static inline void port_enable(void) {
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asm volatile("nop");
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}
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/**
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* @brief Enters an architecture-dependent IRQ-waiting mode.
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* @details The function is meant to return when an interrupt becomes pending.
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* The simplest implementation is an empty function or macro but this
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* would not take advantage of architecture-specific power saving
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* modes.
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* @note Implemented as an inlined @p WFI instruction.
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*/
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static inline void port_wait_for_interrupt(void) {
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_sim_check_for_interrupts();
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}
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#endif /* _CHCORE_H_ */
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/** @} */
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