244 lines
6.8 KiB
C
244 lines
6.8 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
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2011,2012 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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* @addtogroup SIMIA32_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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#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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* Macro defining the a simulated architecture into x86.
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*/
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#define CH_ARCHITECTURE_SIMIA32
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/**
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* Name of the implemented architecture.
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*/
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#define CH_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 CH_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 CH_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 CH_PORT_INFO "No preemption"
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/**
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* 16 bytes stack alignment.
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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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* Generic x86 register.
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*/
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typedef void *regx86;
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/**
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* Interrupt saved context.
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* This structure represents the stack frame saved during a preemption-capable
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* interrupt handler.
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*/
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struct extctx {
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};
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/**
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* System saved context.
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* @note In this demo the floating point registers are not saved.
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*/
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struct 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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* Platform dependent part of the @p Thread structure.
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* This structure usually contains just the saved stack pointer defined as a
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* pointer to a @p intctx structure.
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*/
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struct context {
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struct intctx volatile *esp;
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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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* Platform dependent part of the @p chThdCreateI() API.
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* This code usually setup the context switching frame represented by a
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* @p intctx structure.
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*/
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#define SETUP_CONTEXT(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 intctx); \
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((struct intctx *)esp)->eip = _port_thread_start; \
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((struct intctx *)esp)->ebx = 0; \
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((struct intctx *)esp)->edi = 0; \
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((struct intctx *)esp)->esi = 0; \
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((struct intctx *)esp)->ebp = savebp; \
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tp->p_ctx.esp = (struct intctx *)esp; \
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}
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/**
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* Stack size for the system idle thread.
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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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* Per-thread stack overhead for interrupts servicing, it is used in the
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* calculation of the correct working area size.
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* It requires stack space because the simulated "interrupt handlers" can
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* invoke host library functions inside so it better have a lot of space.
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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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* Enforces a correct alignment for a stack area size value.
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*/
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#define STACK_ALIGN(n) ((((n) - 1) | (sizeof(stkalign_t) - 1)) + 1)
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/**
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* Computes the thread working area global size.
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*/
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#define THD_WA_SIZE(n) STACK_ALIGN(sizeof(Thread) + \
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sizeof(void *) * 4 + \
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sizeof(struct intctx) + \
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sizeof(struct extctx) + \
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(n) + (PORT_INT_REQUIRED_STACK))
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/**
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* Macro used to allocate a thread working area aligned as both position and
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* size.
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*/
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#define WORKING_AREA(s, n) stkalign_t s[THD_WA_SIZE(n) / sizeof(stkalign_t)]
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/**
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* IRQ prologue code, inserted at the start of all IRQ handlers enabled to
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* invoke system APIs.
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*/
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#define PORT_IRQ_PROLOGUE()
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/**
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* IRQ epilogue code, inserted at the end of all IRQ handlers enabled to
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* invoke system APIs.
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*/
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#define PORT_IRQ_EPILOGUE()
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/**
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* IRQ handler function declaration.
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*/
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#define PORT_IRQ_HANDLER(id) void id(void)
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/**
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* Simulator initialization.
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*/
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#define port_init()
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/**
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* Does nothing in this simulator.
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*/
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#define port_lock() asm volatile("nop")
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/**
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* Does nothing in this simulator.
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*/
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#define port_unlock() asm volatile("nop")
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/**
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* Does nothing in this simulator.
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*/
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#define port_lock_from_isr()
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/**
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* Does nothing in this simulator.
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*/
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#define port_unlock_from_isr()
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/**
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* Does nothing in this simulator.
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*/
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#define port_disable()
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/**
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* Does nothing in this simulator.
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*/
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#define port_suspend()
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/**
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* Does nothing in this simulator.
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*/
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#define port_enable()
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/**
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* In the simulator this does a polling pass on the simulated interrupt
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* sources.
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*/
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#define port_wait_for_interrupt() ChkIntSources()
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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 *ntp, Thread *otp);
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__attribute__((fastcall)) void port_halt(void);
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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 ChkIntSources(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _CHCORE_H_ */
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/** @} */
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