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tinySA/os/ports/GCC/PPC/chcore.h

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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012,2013 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 PPC/chcore.h
* @brief PowerPC architecture port macros and structures.
*
* @addtogroup PPC_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
/*===========================================================================*/
/* Port constants (common). */
/*===========================================================================*/
/* Added to make the header stand-alone when included from asm.*/
#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE (!FALSE)
#endif
/**
* @name Supported core variants
* @{
*/
#define PPC_VARIANT_e200z0 200
#define PPC_VARIANT_e200z3 203
#define PPC_VARIANT_e200z4 204
/** @} */
#include "ppcparams.h"
/*===========================================================================*/
/* Port macros (common). */
/*===========================================================================*/
/*===========================================================================*/
/* Port configurable parameters (common). */
/*===========================================================================*/
/**
* @brief Use VLE instruction set.
* @note This parameter is usually set in the Makefile.
*/
#if !defined(PPC_USE_VLE)
#define PPC_USE_VLE TRUE
#endif
/**
* @brief Enables the use of the @p WFI instruction.
*/
#if !defined(PPC_ENABLE_WFI_IDLE)
#define PPC_ENABLE_WFI_IDLE FALSE
#endif
/*===========================================================================*/
/* Port derived parameters (common). */
/*===========================================================================*/
#if PPC_USE_VLE && !PPC_SUPPORTS_VLE
#error "the selected MCU does not support VLE instructions set"
#endif
#if !PPC_USE_VLE && !PPC_SUPPORTS_BOOKE
#error "the selected MCU does not support BookE instructions set"
#endif
/*===========================================================================*/
/* Port exported info (common). */
/*===========================================================================*/
/**
* @brief Unique macro for the implemented architecture.
*/
#define CH_ARCHITECTURE_PPC
/**
* @brief Name of the implemented architecture.
*/
#define CH_ARCHITECTURE_NAME "Power Architecture"
/**
* @brief Name of the architecture variant.
*/
#if (PPC_VARIANT == PPC_VARIANT_e200z0) || defined(__DOXYGEN__)
#define CH_CORE_VARIANT_NAME "e200z0"
#elif PPC_VARIANT == PPC_VARIANT_e200z3
#define CH_CORE_VARIANT_NAME "e200z3"
#elif PPC_VARIANT == PPC_VARIANT_e200z4
#define CH_CORE_VARIANT_NAME "e200z4"
#else
#error "unknown or unsupported PowerPC variant specified"
#endif
/**
* @brief Name of the compiler supported by this port.
*/
#define CH_COMPILER_NAME "GCC " __VERSION__
/**
* @brief Port-specific information string.
*/
#if PPC_USE_VLE
#define CH_PORT_INFO "VLE mode"
#else
#define CH_PORT_INFO "Book-E mode"
#endif
/*===========================================================================*/
/* Port implementation part (common). */
/*===========================================================================*/
#if !defined(_FROM_ASM_)
/**
* @brief Base type for stack and memory alignment.
*/
typedef struct {
uint8_t a[8];
} stkalign_t __attribute__((aligned(8)));
/**
* @brief Generic PPC register.
*/
typedef void *regppc_t;
/**
* @brief Mandatory part of a stack frame.
*/
struct eabi_frame {
regppc_t slink; /**< Stack back link. */
regppc_t shole; /**< Stack hole for LR storage. */
};
/**
* @brief Interrupt saved context.
* @details This structure represents the stack frame saved during a
* preemption-capable interrupt handler.
* @note R2 and R13 are not saved because those are assumed to be immutable
* during the system life cycle.
*/
struct extctx {
struct eabi_frame frame;
/* Start of the e_stmvsrrw frame (offset 8).*/
regppc_t pc;
regppc_t msr;
/* Start of the e_stmvsprw frame (offset 16).*/
regppc_t cr;
regppc_t lr;
regppc_t ctr;
regppc_t xer;
/* Start of the e_stmvgprw frame (offset 32).*/
regppc_t r0;
regppc_t r3;
regppc_t r4;
regppc_t r5;
regppc_t r6;
regppc_t r7;
regppc_t r8;
regppc_t r9;
regppc_t r10;
regppc_t r11;
regppc_t r12;
regppc_t padding;
};
/**
* @brief System saved context.
* @details This structure represents the inner stack frame during a context
* switching.
* @note R2 and R13 are not saved because those are assumed to be immutable
* during the system life cycle.
* @note LR is stored in the caller contex so it is not present in this
* structure.
*/
struct intctx {
regppc_t cr; /* Part of it is not volatile... */
regppc_t r14;
regppc_t r15;
regppc_t r16;
regppc_t r17;
regppc_t r18;
regppc_t r19;
regppc_t r20;
regppc_t r21;
regppc_t r22;
regppc_t r23;
regppc_t r24;
regppc_t r25;
regppc_t r26;
regppc_t r27;
regppc_t r28;
regppc_t r29;
regppc_t r30;
regppc_t r31;
regppc_t padding;
};
/**
* @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 chThdCreateI() API.
* @details This code usually setup the context switching frame represented
* by an @p intctx structure.
*/
#define SETUP_CONTEXT(workspace, wsize, pf, arg) { \
uint8_t *sp = (uint8_t *)workspace + wsize - sizeof(struct eabi_frame); \
((struct eabi_frame *)sp)->slink = 0; \
((struct eabi_frame *)sp)->shole = _port_thread_start; \
tp->p_ctx.sp = (struct intctx *)(sp - sizeof(struct intctx)); \
tp->p_ctx.sp->r31 = arg; \
tp->p_ctx.sp->r30 = pf; \
}
/**
* @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 32
#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 256
#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) + \
sizeof(struct extctx) + \
(n) + (PORT_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()
/**
* @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)
/**
* @details Implemented as global interrupt disable.
*/
#define port_lock() asm volatile ("wrteei 0" : : : "memory")
/**
* @details Implemented as global interrupt enable.
*/
#define port_unlock() asm volatile("wrteei 1" : : : "memory")
/**
* @details Implemented as global interrupt disable.
*/
#define port_lock_from_isr() /*asm ("wrteei 0")*/
/**
* @details Implemented as global interrupt enable.
*/
#define port_unlock_from_isr() /*asm ("wrteei 1")*/
/**
* @details Implemented as global interrupt disable.
*/
#define port_disable() asm volatile ("wrteei 0" : : : "memory")
/**
* @details Same as @p port_disable() in this port, there is no difference
* between the two states.
*/
#define port_suspend() asm volatile ("wrteei 0" : : : "memory")
/**
* @details Implemented as global interrupt enable.
*/
#define port_enable() asm volatile ("wrteei 1" : : : "memory")
/**
* @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 The implementation of this code affects <b>directly</b> the context
* switch performance so optimize here as much as you can.
*
* @param[in] ntp the thread to be switched in
* @param[in] otp the thread to be switched out
*/
#if !CH_DBG_ENABLE_STACK_CHECK || defined(__DOXYGEN__)
#define port_switch(ntp, otp) _port_switch(ntp, otp)
#else
#define port_switch(ntp, otp) { \
register struct intctx *sp asm ("%r1"); \
if ((stkalign_t *)(sp - 1) < otp->p_stklimit) \
chDbgPanic("stack overflow"); \
_port_switch(ntp, otp); \
}
#endif
/**
* @brief Writes to a special register.
*
* @param[in] spr special register number
* @param[in] val value to be written
*/
#define port_mtspr(spr, val) \
asm volatile ("mtspr %0,%1" : : "n" (spr), "r" (val))
/**
* @details This port function is implemented as inlined code for performance
* reasons.
*/
#if PPC_ENABLE_WFI_IDLE
#if !defined(port_wait_for_interrupt)
#define port_wait_for_interrupt() { \
asm volatile ("wait" : : : "memory"); \
}
#endif
#else
#define port_wait_for_interrupt()
#endif
#ifdef __cplusplus
extern "C" {
#endif
void port_init(void);
void port_halt(void);
void _port_switch(Thread *ntp, Thread *otp);
void _port_thread_start(void);
#ifdef __cplusplus
}
#endif
#endif /* _FROM_ASM_ */
#endif /* _CHCORE_H_ */
/** @} */
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