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rt-thread/libcpu/sim/win32/cpu_port.c

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/*
************************************************************************************************************************
* File : cpu_port.c
* By : xyou
* Version : V1.00.00
*
* By : prife
* Version : V1.00.01
************************************************************************************************************************
*/
/*
*********************************************************************************************************
* INCLUDE FILES
*********************************************************************************************************
*/
#include <rtthread.h>
#include <windows.h>
#include <mmsystem.h>
#include <stdio.h>
#include "cpu_port.h"
/*
*********************************************************************************************************
* WinThread STRUCTURE
* Windows runs each task in a thread.
* The context switch is managed by the threads.So the task stack does not have to be managed directly,
* although the stack stack is still used to hold an WinThreadState structure this is the only thing it
* will be ever hold.
* the structure indirectly maps the task handle to a thread handle
*********************************************************************************************************
*/
typedef struct
{
void *Param; //Thread param
void (*Entry)(void *); //Thread entry
void (*Exit)(void); //Thread exit
HANDLE ThreadHandle;
DWORD ThreadID;
}win_thread_t;
/*
*********************************************************************************************************
* LOCAL DEFINES
*********************************************************************************************************
*/
#define MAX_INTERRUPT_NUM ((rt_uint32_t)sizeof(rt_uint32_t) * 8)
/*
* Simulated interrupt waiting to be processed.this is a bit mask where each bit represent one interrupt
* so a maximum of 32 interrupts can be simulated
*/
static volatile rt_uint32_t CpuPendingInterrupts = 0;
/*
* An event used to inform the simulated interrupt processing thread (a high priority thread
* that simulated interrupt processing) that an interrupt is pending
*/
static HANDLE hInterruptEventHandle = NULL;
/*
* Mutex used to protect all the simulated interrupt variables that are accessed by multiple threads
*/
static HANDLE hInterruptEventMutex = NULL;
/*
* Handler for all the simulate software interrupts.
* The first two positions are used the Yield and Tick interrupt so are handled slightly differently
* all the other interrupts can be user defined
*/
static rt_uint32_t (*CpuIsrHandler[MAX_INTERRUPT_NUM])(void) = {0};
/*
* Handler for OSTick Thread
*/
static HANDLE OSTick_Thread;
static DWORD OSTick_ThreadID;
static HANDLE OSTick_SignalPtr;
static TIMECAPS OSTick_TimerCap;
static MMRESULT OSTick_TimerID;
/*
* flag in interrupt handling
*/
rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
rt_uint32_t rt_thread_switch_interrupt_flag;
/*
*********************************************************************************************************
* PRIVATE FUNCTION PROTOTYPES
*********************************************************************************************************
*/
//static void WinThreadScheduler(void);
void WinThreadScheduler(void);
rt_uint32_t YieldInterruptHandle(void);
rt_uint32_t SysTickInterruptHandle(void);
static DWORD WINAPI ThreadforSysTickTimer(LPVOID lpParam);
static DWORD WINAPI ThreadforKeyGet(LPVOID lpParam);
/*
*********************************************************************************************************
* CPU Port Function for RT-Thread
*********************************************************************************************************
*/
//void rt_hw_console_output(const char *str)
//{
// printf("%s",str);
//}
/*
*********************************************************************************************************
* rt_hw_stack_init()
* Description : Initialize stack of thread
* Argument(s) : void *pvEntry,void *pvParam,rt_uint8_t *pStackAddr,void *pvExit
* Return(s) : rt_uint8_t*
* Caller(s) : rt_thread_init or rt_thread_create
* Note(s) : none
*********************************************************************************************************
*/
static DWORD WINAPI thread_run( LPVOID lpThreadParameter )
{
win_thread_t *pWinThread = (win_thread_t *)lpThreadParameter;
pWinThread->Entry(pWinThread->Param);
printf("thread %x exit\n", pWinThread->ThreadID);
pWinThread->Exit();
return 0;
}
rt_uint8_t* rt_hw_stack_init(void *pEntry,void *pParam,rt_uint8_t *pStackAddr,void *pExit)
{
win_thread_t *pWinThread = NULL;
/*
* In this simulated case a stack is not initialized
* The thread handles the context switching itself. The WinThreadState object is placed onto the stack
* that was created for the task
* so the stack buffer is still used,just not in the conventional way.
*/
pWinThread = (win_thread_t *)(pStackAddr - sizeof(win_thread_t));
pWinThread->Entry = pEntry;
pWinThread->Param = pParam;
pWinThread->Exit = pExit;
pWinThread->ThreadHandle = NULL;
pWinThread->ThreadID = 0;
/* Create the winthread */
pWinThread->ThreadHandle = CreateThread(NULL,
0,
(LPTHREAD_START_ROUTINE) thread_run,
pWinThread,
CREATE_SUSPENDED,
&(pWinThread->ThreadID));
SetThreadAffinityMask(pWinThread->ThreadHandle,
0x01);
SetThreadPriorityBoost(pWinThread->ThreadHandle,
TRUE);
SetThreadPriority(pWinThread->ThreadHandle,
THREAD_PRIORITY_IDLE);
return (rt_uint8_t*)pWinThread;
} /*** rt_hw_stack_init ***/
/*
*********************************************************************************************************
* rt_hw_interrupt_disable()
* Description : disable cpu interrupts
* Argument(s) : void
* Return(s) : rt_base_t
* Caller(s) : Applicatios or os_kernel
* Note(s) : none
*********************************************************************************************************
*/
rt_base_t rt_hw_interrupt_disable(void)
{
if(hInterruptEventMutex != NULL)
{
WaitForSingleObject(hInterruptEventMutex,INFINITE);
}
return 0;
} /*** rt_hw_interrupt_disable ***/
/*
*********************************************************************************************************
* rt_hw_interrupt_enable()
* Description : enable cpu interrupts
* Argument(s) : rt_base_t level
* Return(s) : void
* Caller(s) : Applications or os_kernel
* Note(s) : none
*********************************************************************************************************
*/
void rt_hw_interrupt_enable(rt_base_t level)
{
level = level;
if (hInterruptEventMutex != NULL)
{
ReleaseMutex(hInterruptEventMutex);
}
} /*** rt_hw_interrupt_enable ***/
/*
*********************************************************************************************************
* rt_hw_context_switch_interrupt()
* Description : switch thread's contex
* Argument(s) : void
* Return(s) : void
* Caller(s) : os kernel
* Note(s) : none
*********************************************************************************************************
*/
void rt_hw_context_switch_interrupt(rt_uint32_t from,
rt_uint32_t to)
{
if(rt_thread_switch_interrupt_flag != 1)
{
rt_thread_switch_interrupt_flag = 1;
// set rt_interrupt_from_thread
rt_interrupt_from_thread = *((rt_uint32_t *)(from));
}
rt_interrupt_to_thread = *((rt_uint32_t *)(to));
//trigger YIELD exception(cause contex switch)
TriggerSimulateInterrupt(CPU_INTERRUPT_YIELD);
} /*** rt_hw_context_switch_interrupt ***/
void rt_hw_context_switch(rt_uint32_t from,
rt_uint32_t to)
{
if(rt_thread_switch_interrupt_flag != 1)
{
rt_thread_switch_interrupt_flag = 1;
// set rt_interrupt_from_thread
rt_interrupt_from_thread = *((rt_uint32_t *)(from));
}
// set rt_interrupt_to_thread
rt_interrupt_to_thread = *((rt_uint32_t *)(to));
//trigger YIELD exception(cause contex switch)
TriggerSimulateInterrupt(CPU_INTERRUPT_YIELD);
} /*** rt_hw_context_switch ***/
/*
*********************************************************************************************************
* rt_hw_context_switch_to()
* Description : switch to new thread
* Argument(s) : rt_uint32_t to //the stack address of the thread which will switch to
* Return(s) : void
* Caller(s) : rt_thread schecale
* Note(s) : this function is used to perform the first thread switch
*********************************************************************************************************
*/
void rt_hw_context_switch_to(rt_uint32_t to)
{
//set to thread
rt_interrupt_to_thread = *((rt_uint32_t *)(to));
//clear from thread
rt_interrupt_from_thread = 0;
//set interrupt to 1
rt_thread_switch_interrupt_flag = 1;
//start WinThreadScheduler
WinThreadScheduler();
//never reach here!
return;
} /*** rt_hw_context_switch_to ***/
/*
*********************************************************************************************************
* TriggerSimulateInterrupt()
* Description : Trigger a simulated interrupts handle
* Argument(s) : t_uint32_t IntIndex
* Return(s) : void
* Caller(s) : Applications
* Note(s) : none
*********************************************************************************************************
*/
void TriggerSimulateInterrupt(rt_uint32_t IntIndex)
{
if((IntIndex < MAX_INTERRUPT_NUM) && (hInterruptEventMutex != NULL))
{
/* Yield interrupts are processed even when critical nesting is non-zero */
WaitForSingleObject(hInterruptEventMutex,
INFINITE);
CpuPendingInterrupts |= (1 << IntIndex);
SetEvent(hInterruptEventHandle);
ReleaseMutex(hInterruptEventMutex);
}
} /*** TriggerSimulateInterrupt ***/
/*
*********************************************************************************************************
* RegisterSimulateInterrupt()
* Description : Register a interrupt handle to simulate paltform
* Argument(s) : rt_uint32_t IntIndex,rt_uint32_t (*IntHandler)(void)
* Return(s) : void
* Caller(s) : Applications
* Note(s) : none
*********************************************************************************************************
*/
void RegisterSimulateInterrupt(rt_uint32_t IntIndex,rt_uint32_t (*IntHandler)(void))
{
if(IntIndex < MAX_INTERRUPT_NUM)
{
if (hInterruptEventMutex != NULL)
{
WaitForSingleObject(hInterruptEventMutex,
INFINITE);
CpuIsrHandler[IntIndex] = IntHandler;
ReleaseMutex(hInterruptEventMutex);
}
else
{
CpuIsrHandler[IntIndex] = IntHandler;
}
}
} /*** RegisterSimulateInterrupt ***/
/*
*********************************************************************************************************
* PRIVATE FUNCTION
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* WinThreadScheduler()
* Description : Handle all simulate interrupts
* Argument(s) : void
* Return(s) : static void
* Caller(s) : os scachle
* Note(s) : none
*********************************************************************************************************
*/
#define WIN_WM_MIN_RES (1)
void WinThreadScheduler(void)
{
HANDLE hInterruptObjectList[2];
HANDLE hThreadHandle;
rt_uint32_t SwitchRequiredMask;
rt_uint32_t i;
win_thread_t *WinThreadFrom;
win_thread_t *WinThreadTo;
/*
* Install the interrupt handlers used bye scheduler itself
*/
RegisterSimulateInterrupt(CPU_INTERRUPT_YIELD,
YieldInterruptHandle);
RegisterSimulateInterrupt(CPU_INTERRUPT_TICK,
SysTickInterruptHandle);
/*
* Create the events and mutex that are used to synchronise all the WinThreads
*/
hInterruptEventMutex = CreateMutex(NULL,
FALSE,
NULL);
hInterruptEventHandle = CreateEvent(NULL,
FALSE,
FALSE,
NULL);
if((hInterruptEventMutex == NULL) || (hInterruptEventHandle == NULL))
{
return;
}
/*
* Set the priority of this WinThread such that it is above the priority of the WinThreads
* that run rt-threads.
* This is higher priority is required to ensure simulate interrupts take priority over rt-threads
*/
hThreadHandle = GetCurrentThread();
if(hThreadHandle == NULL)
{
return;
}
if (SetThreadPriority(hThreadHandle,
THREAD_PRIORITY_HIGHEST) == 0)
{
return;
}
SetThreadPriorityBoost(hThreadHandle,
TRUE);
SetThreadAffinityMask(hThreadHandle,
0x01);
/*
* Start the thread that simulates the timer peripheral to generate tick interrupts.
*/
OSTick_Thread = CreateThread(NULL,
0,
ThreadforSysTickTimer,
0,
CREATE_SUSPENDED,
&OSTick_ThreadID);
if(OSTick_Thread == NULL)
{
//Display Error Message
return;
}
SetThreadPriority(OSTick_Thread,
THREAD_PRIORITY_NORMAL);
SetThreadPriorityBoost(OSTick_Thread,
TRUE);
SetThreadAffinityMask(OSTick_Thread,
0x01);
/*
* Set timer Caps
*/
if (timeGetDevCaps(&OSTick_TimerCap,
sizeof(OSTick_TimerCap)) != TIMERR_NOERROR)
{
CloseHandle(OSTick_Thread);
return;
}
if (OSTick_TimerCap.wPeriodMin < WIN_WM_MIN_RES)
{
OSTick_TimerCap.wPeriodMin = WIN_WM_MIN_RES;
}
if(timeBeginPeriod(OSTick_TimerCap.wPeriodMin) != TIMERR_NOERROR)
{
CloseHandle(OSTick_Thread);
return;
}
OSTick_SignalPtr = CreateEvent(NULL,TRUE,FALSE,NULL);
if(OSTick_SignalPtr == NULL)
{
// disp error message
timeEndPeriod(OSTick_TimerCap.wPeriodMin);
CloseHandle(OSTick_Thread);
return;
}
OSTick_TimerID = timeSetEvent((UINT ) (1000 / RT_TICK_PER_SECOND) ,
(UINT ) OSTick_TimerCap.wPeriodMin,
(LPTIMECALLBACK ) OSTick_SignalPtr,
(DWORD_PTR ) NULL,
(UINT ) (TIME_PERIODIC | TIME_CALLBACK_EVENT_SET));
if(OSTick_TimerID == 0)
{
//disp
CloseHandle(OSTick_SignalPtr);
timeEndPeriod(OSTick_TimerCap.wPeriodMin);
CloseHandle(OSTick_Thread);
return;
}
/*
* Start OS Tick Thread an release Interrupt Mutex
*/
ResumeThread(OSTick_Thread);
ReleaseMutex( hInterruptEventMutex );
//trigger YEILD INTERRUPT
TriggerSimulateInterrupt(CPU_INTERRUPT_YIELD);
/*
* block on the mutex that ensure exclusive access to the simulated interrupt objects
* and the events that signals that a simulated interrupt should be processed.
*/
hInterruptObjectList[0] = hInterruptEventHandle;
hInterruptObjectList[1] = hInterruptEventMutex;
while (1)
{
WaitForMultipleObjects(sizeof(hInterruptObjectList) / sizeof(HANDLE),
hInterruptObjectList,
TRUE,
INFINITE);
/*
* Used to indicate whether the simulate interrupt processing has necessitated a contex
* switch to another thread
*/
SwitchRequiredMask = 0;
/*
* For each interrupt we are interested in processing ,each of which is represented
* by a bit in the 32bit CpuPendingInterrupts variable.
*/
for (i = 0; i < MAX_INTERRUPT_NUM; ++i)
{
/* is the simulated interrupt pending ? */
if (CpuPendingInterrupts & (1UL << i))
{
/* Is a handler installed ?*/
if (CpuIsrHandler[i] != NULL)
{
/* Run the actual handler */
if (CpuIsrHandler[i]() != 0)
{
SwitchRequiredMask |= (1UL << i);
}
}
/* Clear the interrupt pending bit */
CpuPendingInterrupts &= ~(1UL << i);
}
}
if(SwitchRequiredMask != 0)
{
WinThreadFrom = (win_thread_t *)rt_interrupt_from_thread;
WinThreadTo = (win_thread_t *)rt_interrupt_to_thread;
if ((WinThreadFrom != NULL) && (WinThreadFrom->ThreadHandle != NULL))
{
SuspendThread(WinThreadFrom->ThreadHandle);
}
ResumeThread(WinThreadTo->ThreadHandle);
}
ReleaseMutex(hInterruptEventMutex);
}
} /*** WinThreadScheduler ***/
/*
*********************************************************************************************************
* ThreadforSysTickTimer()
* Description : win thread to simulate a systick timer
* Argument(s) : LPVOID lpParam
* Return(s) : static DWORD WINAPI
* Caller(s) : none
* Note(s) : This is not a real time way of generating tick events as the next wake time should be relative
* to the previous wake time,not the time Sleep() is called.
* It is done this way to prevent overruns in this very non real time simulated/emulated environment
*********************************************************************************************************
*/
static DWORD WINAPI ThreadforSysTickTimer(LPVOID lpParam)
{
(void)lpParam; //prevent compiler warnings
for(;;)
{
/*
* Wait until the timer expires and we can access the simulated interrupt variables.
*/
WaitForSingleObject(OSTick_SignalPtr,INFINITE);
ResetEvent(OSTick_SignalPtr);
/*
* Trigger a systick interrupt
*/
TriggerSimulateInterrupt(CPU_INTERRUPT_TICK);
}
return 0;
} /*** prvThreadforSysTickTimer ***/
/*
*********************************************************************************************************
* SysTickInterruptHandle()
* Description : Interrupt handle for systick
* Argument(s) : void
* Return(s) : rt_uint32_t
* Caller(s) : none
* Note(s) : none
*********************************************************************************************************
*/
rt_uint32_t SysTickInterruptHandle(void)
{
/* enter interrupt */
rt_interrupt_enter();
rt_tick_increase();
/* leave interrupt */
rt_interrupt_leave();
return 0;
} /*** SysTickInterruptHandle ***/
/*
*********************************************************************************************************
* YieldInterruptHandle()
* Description : Interrupt handle for Yield
* Argument(s) : void
* Return(s) : rt_uint32_t
* Caller(s) : none
* Note(s) : none
*********************************************************************************************************
*/
rt_uint32_t YieldInterruptHandle(void)
{
/*
* if rt_thread_switch_interrupt_flag = 1 yield already handled
*/
if(rt_thread_switch_interrupt_flag != 0)
{
rt_thread_switch_interrupt_flag = 0;
/* return thread switch request = 1 */
return 1;
}
return 0;
} /*** YieldInterruptHandle ***/
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