chcore.h
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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 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/>.
---
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes ChibiOS/RT, without being obliged to provide
the source code for any proprietary components. See the file exception.txt
for full details of how and when the exception can be applied.
*/
/**
* @addtogroup SIMIA32_CORE
* @{
*/
#ifndef _CHCORE_H_
#define _CHCORE_H_
#if CH_DBG_ENABLE_STACK_CHECK
#error "option CH_DBG_ENABLE_STACK_CHECK not supported by this port"
#endif
/**
* Macro defining the a simulated architecture into x86.
*/
#define CH_ARCHITECTURE_SIMIA32
/**
* Name of the implemented architecture.
*/
#define CH_ARCHITECTURE_NAME "Simulator"
/**
* @brief Name of the architecture variant (optional).
*/
#define CH_CORE_VARIANT_NAME "x86 (integer only)"
/**
* @brief Name of the compiler supported by this port.
*/
#define CH_COMPILER_NAME "GCC " __VERSION__
/**
* @brief Port-specific information string.
*/
#define CH_PORT_INFO "No preemption"
/**
* 16 bytes stack alignment.
*/
typedef struct {
uint8_t a[16];
} stkalign_t __attribute__((aligned(16)));
/**
* Generic x86 register.
*/
typedef void *regx86;
/**
* Interrupt saved context.
* This structure represents the stack frame saved during a preemption-capable
* interrupt handler.
*/
struct extctx {
};
/**
* System saved context.
* @note In this demo the floating point registers are not saved.
*/
struct intctx {
regx86 ebx;
regx86 edi;
regx86 esi;
regx86 ebp;
regx86 eip;
};
/**
* Platform dependent part of the @p Thread structure.
* This structure usually contains just the saved stack pointer defined as a
* pointer to a @p intctx structure.
*/
struct context {
struct intctx volatile *esp;
};
#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)
/**
* Platform dependent part of the @p chThdCreateI() API.
* This code usually setup the context switching frame represented by a
* @p intctx structure.
*/
#define SETUP_CONTEXT(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 intctx); \
((struct intctx *)esp)->eip = _port_thread_start; \
((struct intctx *)esp)->ebx = 0; \
((struct intctx *)esp)->edi = 0; \
((struct intctx *)esp)->esi = 0; \
((struct intctx *)esp)->ebp = savebp; \
tp->p_ctx.esp = (struct intctx *)esp; \
}
/**
* Stack size for the system idle thread.
*/
#ifndef PORT_IDLE_THREAD_STACK_SIZE
#define PORT_IDLE_THREAD_STACK_SIZE 256
#endif
/**
* Per-thread stack overhead for interrupts servicing, it is used in the
* calculation of the correct working area size.
* It requires stack space because the simulated "interrupt handlers" can
* invoke host library functions inside so it better have a lot of space.
*/
#ifndef PORT_INT_REQUIRED_STACK
#define PORT_INT_REQUIRED_STACK 16384
#endif
/**
* Enforces a correct alignment for a stack area size value.
*/
#define STACK_ALIGN(n) ((((n) - 1) | (sizeof(stkalign_t) - 1)) + 1)
/**
* Computes the thread working area global size.
*/
#define THD_WA_SIZE(n) STACK_ALIGN(sizeof(Thread) + \
sizeof(void *) * 4 + \
sizeof(struct intctx) + \
sizeof(struct extctx) + \
(n) + (PORT_INT_REQUIRED_STACK))
/**
* Macro used to allocate a thread working area aligned as both position and
* size.
*/
#define WORKING_AREA(s, n) stkalign_t s[THD_WA_SIZE(n) / sizeof(stkalign_t)]
/**
* IRQ prologue code, inserted at the start of all IRQ handlers enabled to
* invoke system APIs.
*/
#define PORT_IRQ_PROLOGUE()
/**
* IRQ epilogue code, inserted at the end of all IRQ handlers enabled to
* invoke system APIs.
*/
#define PORT_IRQ_EPILOGUE()
/**
* IRQ handler function declaration.
*/
#define PORT_IRQ_HANDLER(id) void id(void)
/**
* Simulator initialization.
*/
#define port_init()
/**
* Does nothing in this simulator.
*/
#define port_lock() asm volatile("nop")
/**
* Does nothing in this simulator.
*/
#define port_unlock() asm volatile("nop")
/**
* Does nothing in this simulator.
*/
#define port_lock_from_isr()
/**
* Does nothing in this simulator.
*/
#define port_unlock_from_isr()
/**
* Does nothing in this simulator.
*/
#define port_disable()
/**
* Does nothing in this simulator.
*/
#define port_suspend()
/**
* Does nothing in this simulator.
*/
#define port_enable()
/**
* In the simulator this does a polling pass on the simulated interrupt
* sources.
*/
#define port_wait_for_interrupt() ChkIntSources()
#ifdef __cplusplus
extern "C" {
#endif
__attribute__((fastcall)) void port_switch(Thread *ntp, Thread *otp);
__attribute__((fastcall)) void port_halt(void);
__attribute__((cdecl, noreturn)) void _port_thread_start(msg_t (*pf)(void *),
void *p);
void ChkIntSources(void);
#ifdef __cplusplus
}
#endif
#endif /* _CHCORE_H_ */
/** @} */