/*
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 .
*/
/**
* @file PPC/chcore.h
* @brief PowerPC architecture port macros and structures.
*
* @addtogroup PPC_CORE
* @{
*/
#ifndef _CHCORE_H_
#define _CHCORE_H_
#include "intc.h"
/*===========================================================================*/
/* Module constants. */
/*===========================================================================*/
/**
* @name Architecture and Compiler
* @{
*/
/**
* @brief Macro defining an PPC architecture.
*/
#define PORT_ARCHITECTURE_PPC
/**
* @brief Macro defining the specific PPC architecture.
*/
#define PORT_ARCHITECTURE_PPC_E200
/**
* @brief Name of the implemented architecture.
*/
#define PORT_ARCHITECTURE_NAME "Power Architecture"
/**
* @brief Compiler name and version.
*/
#if defined(__GNUC__) || defined(__DOXYGEN__)
#define PORT_COMPILER_NAME "GCC " __VERSION__
#else
#error "unsupported compiler"
#endif
/**
* @brief This port supports a realtime counter.
*/
#define PORT_SUPPORTS_RT FALSE
/** @} */
/**
* @name E200 core variants
* @{
*/
#define PPC_VARIANT_e200z0 200
#define PPC_VARIANT_e200z2 202
#define PPC_VARIANT_e200z3 203
#define PPC_VARIANT_e200z4 204
/** @} */
/* Inclusion of the PPC implementation specific parameters.*/
#include "ppcparams.h"
#include "vectors.h"
/*===========================================================================*/
/* 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.
* @note In this port it is set to 32 because the idle thread does have
* a stack frame when compiling without optimizations. You may
* reduce this value to zero when compiling with optimizations.
*/
#if !defined(PORT_IDLE_THREAD_STACK_SIZE) || defined(__DOXYGEN__)
#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.
* @note In this port this value is conservatively is set to 256 because
* there is no separate interrupts stack (yet).
*/
#if !defined(PORT_INT_REQUIRED_STACK) || defined(__DOXYGEN__)
#define PORT_INT_REQUIRED_STACK 256
#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
/**
* @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
/*===========================================================================*/
/* Derived constants and error checks. */
/*===========================================================================*/
#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
/**
* @brief Name of the architecture variant.
*/
#if (PPC_VARIANT == PPC_VARIANT_e200z0) || defined(__DOXYGEN__)
#define PORT_CORE_VARIANT_NAME "e200z0"
#elif PPC_VARIANT == PPC_VARIANT_e200z2
#define PORT_CORE_VARIANT_NAME "e200z2"
#elif PPC_VARIANT == PPC_VARIANT_e200z3
#define PORT_CORE_VARIANT_NAME "e200z3"
#elif PPC_VARIANT == PPC_VARIANT_e200z4
#define PORT_CORE_VARIANT_NAME "e200z4"
#else
#error "unknown or unsupported PowerPC variant specified"
#endif
/**
* @brief Port-specific information string.
*/
#if PPC_USE_VLE
#define PORT_INFO "VLE mode"
#else
#define PORT_INFO "Book-E mode"
#endif
/*===========================================================================*/
/* Module data structures and types. */
/*===========================================================================*/
/* The following code is not processed when the file is included from an
asm module.*/
#if !defined(_FROM_ASM_)
/**
* @brief Type of stack and memory alignment enforcement.
* @note In this architecture the stack alignment is enforced to 64 bits.
*/
typedef uint64_t stkalign_t;
/**
* @brief Generic PPC register.
*/
typedef void *regppc_t;
/**
* @brief Mandatory part of a stack frame.
*/
struct port_eabi_frame {
uint32_t slink; /**< Stack back link. */
uint32_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 port_extctx {
struct port_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 context so it is not present in this
* structure.
*/
struct port_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_t structure.
* @details This structure usually contains just the saved stack pointer
* defined as a pointer to a @p port_intctx structure.
*/
struct context {
struct port_intctx *sp;
};
#endif /* !defined(_FROM_ASM_) */
/*===========================================================================*/
/* Module macros. */
/*===========================================================================*/
/**
* @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 *sp = (uint8_t *)(workspace) + \
(wsize) - \
sizeof(struct port_eabi_frame); \
((struct port_eabi_frame *)sp)->slink = 0; \
((struct port_eabi_frame *)sp)->shole = (uint32_t)_port_thread_start; \
(tp)->p_ctx.sp = (struct port_intctx *)(sp - sizeof(struct port_intctx)); \
(tp)->p_ctx.sp->r31 = (regppc_t)(arg); \
(tp)->p_ctx.sp->r30 = (regppc_t)(pf); \
}
/**
* @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(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)
/**
* @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 directly 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 port_intctx *sp asm ("%r1"); \
if ((stkalign_t *)(sp - 1) < otp->p_stklimit) \
chSysHalt("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, must be an automatic variable
*/
#define port_write_spr(spr, val) \
asm volatile ("mtspr %[p0], %[p1]" : : [p0] "n" (spr), [p1] "r" (val))
/**
* @brief Writes to a special register.
*
* @param[in] spr special register number
* @param[in] val returned value, must be an automatic variable
*/
#define port_read_spr(spr, val) \
asm volatile ("mfspr %[p0], %[p1]" : [p0] "=r" (val) : [p1] "n" (spr))
/*===========================================================================*/
/* External declarations. */
/*===========================================================================*/
/* The following code is not processed when the file is included from an
asm module.*/
#if !defined(_FROM_ASM_)
#ifdef __cplusplus
extern "C" {
#endif
void _port_switch(thread_t *ntp, thread_t *otp);
void _port_thread_start(void);
#ifdef __cplusplus
}
#endif
#endif /* !defined(_FROM_ASM_) */
/*===========================================================================*/
/* Module inline functions. */
/*===========================================================================*/
/* The following code is not processed when the file is included from an
asm module.*/
#if !defined(_FROM_ASM_)
/**
* @brief Kernel port layer initialization.
* @details IVOR4 and IVOR10 initialization.
*/
static inline void port_init(void) {
uint32_t n;
unsigned i;
/* Initializing the SPRG0 register to zero, it is required for interrupts
handling.*/
n = 0;
port_write_spr(272, n);
#if PPC_SUPPORTS_IVORS
/* The CPU supports IVOR registers, the kernel requires IVOR4 and IVOR10
and the initialization is performed here.*/
asm volatile ("li %%r3, _IVOR4@l \t\n"
"mtIVOR4 %%r3 \t\n"
"li %%r3, _IVOR10@l \t\n"
"mtIVOR10 %%r3" : : : "r3", "memory");
#endif
/* INTC initialization, software vector mode, 4 bytes vectors, starting
at priority 0.*/
INTC_BCR = 0;
for (i = 0; i < PPC_CORE_NUMBER; i++) {
INTC_CPR(i) = 0;
INTC_IACKR(i) = (uint32_t)_vectors;
}
}
/**
* @brief Returns a word encoding the current interrupts status.
*
* @return The interrupts status.
*/
static inline syssts_t port_get_irq_status(void) {
uint32_t sts;
asm volatile ("mfmsr %[p0]" : [p0] "=r" (sts) :);
return sts;
}
/**
* @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 (bool)((sts & (1 << 15)) != 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) {
uint32_t sprg0;
/* The SPRG0 register is increased before entering interrupt handlers and
decreased at the end.*/
port_read_spr(272, sprg0);
return (bool)(sprg0 > 0);
}
/**
* @brief Kernel-lock action.
* @note Implemented as global interrupt disable.
*/
static inline void port_lock(void) {
asm volatile ("wrteei 0" : : : "memory");
}
/**
* @brief Kernel-unlock action.
* @note Implemented as global interrupt enable.
*/
static inline void port_unlock(void) {
asm volatile("wrteei 1" : : : "memory");
}
/**
* @brief Kernel-lock action from an interrupt handler.
* @note Implementation not needed.
*/
static inline void port_lock_from_isr(void) {
}
/**
* @brief Kernel-unlock action from an interrupt handler.
* @note Implementation not needed.
*/
static inline void port_unlock_from_isr(void) {
}
/**
* @brief Disables all the interrupt sources.
* @note Implemented as global interrupt disable.
*/
static inline void port_disable(void) {
asm volatile ("wrteei 0" : : : "memory");
}
/**
* @brief Disables the interrupt sources below kernel-level priority.
* @note Same as @p port_disable() in this port, there is no difference
* between the two states.
*/
static inline void port_suspend(void) {
asm volatile ("wrteei 0" : : : "memory");
}
/**
* @brief Enables all the interrupt sources.
* @note Implemented as global interrupt enable.
*/
static inline void port_enable(void) {
asm volatile ("wrteei 1" : : : "memory");
}
/**
* @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 wait instruction.
*/
static inline void port_wait_for_interrupt(void) {
#if PPC_ENABLE_WFI_IDLE
asm volatile ("wait" : : : "memory");
#endif
}
/**
* @brief Returns the current value of the realtime counter.
*
* @return The realtime counter value.
*/
static inline rtcnt_t port_rt_get_counter_value(void) {
return 0;
}
#endif /* !defined(_FROM_ASM_) */
/*===========================================================================*/
/* Module late inclusions. */
/*===========================================================================*/
#if !defined(_FROM_ASM_)
#if CH_CFG_ST_TIMEDELTA > 0
#if !PORT_USE_ALT_TIMER
#include "chcore_timer.h"
#else /* PORT_USE_ALT_TIMER */
#include "chcore_timer_alt.h"
#endif /* PORT_USE_ALT_TIMER */
#endif /* CH_CFG_ST_TIMEDELTA > 0 */
#endif /* !defined(_FROM_ASM_) */
#endif /* _CHCORE_H_ */
/** @} */