First cut of bare metal GOS layer. Only requires gfxGetSystemTicks() and gfxMilliseconds2Ticks() to be defined by the user.
inmarket
parent
4dc9bf34a7
commit
daf881428e
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@ -26,14 +26,14 @@
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#define GFX_DISPLAY_RULE_WARNINGS FALSE
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#endif
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#if !GFX_USE_OS_CHIBIOS && !GFX_USE_OS_WIN32 && !GFX_USE_OS_LINUX && !GFX_USE_OS_OSX
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#if !GFX_USE_OS_CHIBIOS && !GFX_USE_OS_WIN32 && !GFX_USE_OS_LINUX && !GFX_USE_OS_OSX && !GFX_USE_OS_RAW32
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#if GFX_DISPLAY_RULE_WARNINGS
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#warning "GOS: No Operating System has been defined. ChibiOS (GFX_USE_OS_CHIBIOS) has been turned on for you."
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#endif
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#undef GFX_USE_OS_CHIBIOS
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#define GFX_USE_OS_CHIBIOS TRUE
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#endif
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#if GFX_USE_OS_CHIBIOS + GFX_USE_OS_WIN32 + GFX_USE_OS_LINUX + GFX_USE_OS_OSX != 1 * TRUE
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#if GFX_USE_OS_CHIBIOS + GFX_USE_OS_WIN32 + GFX_USE_OS_LINUX + GFX_USE_OS_OSX + GFX_USE_OS_RAW32 != 1 * TRUE
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#error "GOS: More than one operation system has been defined as TRUE."
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#endif
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@ -435,6 +435,8 @@
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#include "gos/linux.h"
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#elif GFX_USE_OS_OSX
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#include "gos/osx.h"
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#elif GFX_USE_OS_RAW32
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#include "gos/raw32.h"
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#else
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#error "Your operating system is not supported yet"
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#endif
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@ -48,6 +48,13 @@
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#ifndef GFX_USE_OS_OSX
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#define GFX_USE_OS_OSX FALSE
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#endif
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/**
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* @brief Use a Raw 32 bit CPU based system
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* @details Defaults to FALSE
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*/
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#ifndef GFX_USE_OS_RAW32
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#define GFX_USE_OS_RAW32 FALSE
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#endif
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/**
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* @}
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*
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@ -0,0 +1,124 @@
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/*
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* This file is subject to the terms of the GFX License. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://ugfx.org/license.html
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*/
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/**
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* @file include/gos/raw32.h
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* @brief GOS - Operating System Support header file for any 32 bit processor in bare-metal mode
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*/
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/**
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* The raw32 GOS implementation supports any 32 bit processor with or without an
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* underlying operating system. It uses cooperative multi-tasking. Be careful
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* when writing device drivers not to disturb the assumptions this creates by performing
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* call-backs to uGFX code unless you define the INTERRUPTS_OFF() and INTERRUPTS_ON() macros.
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* It still requires some C runtime library support...
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* enough startup to initialise the stack, interrupts, static data etc and call main().
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* setjmp() and longjmp() - for threading
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* memcpy() - for heap and threading
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* malloc(), realloc and free() - if GOS_RAW_HEAP_SIZE == 0
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*
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* You must also define the following routines in your own code so that timing functions will work...
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* systemticks_t gfxSystemTicks(void);
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* systemticks_t gfxMillisecondsToTicks(delaytime_t ms);
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*/
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#ifndef _GOS_RAW32_H
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#define _GOS_RAW32_H
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#if GFX_USE_OS_RAW32
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/*===========================================================================*/
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/* Special Macros just for a Raw implementation */
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/*===========================================================================*/
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/**
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* @brief Set the maximum size of the heap.
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* @note If set to 0 then the C runtime library malloc() and free() are used.
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*/
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#ifndef GOS_RAW_HEAP_SIZE
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#define GOS_RAW_HEAP_SIZE 0
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#endif
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/*===========================================================================*/
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/* Type definitions */
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/*===========================================================================*/
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typedef unsigned char bool_t;
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typedef char int8_t;
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typedef unsigned char uint8_t;
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typedef short int16_t;
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typedef unsigned short uint16_t;
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typedef int int32_t;
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typedef unsigned int uint32_t;
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typedef uint32_t size_t;
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typedef uint32_t delaytime_t;
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typedef uint32_t systemticks_t;
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typedef short semcount_t;
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typedef int threadreturn_t;
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typedef int threadpriority_t;
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#define DECLARE_THREAD_FUNCTION(fnName, param) threadreturn_t fnName(void *param)
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#define DECLARE_THREAD_STACK(name, sz) uint8_t name[sz];
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#define TIME_IMMEDIATE 0
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#define TIME_INFINITE ((delaytime_t)-1)
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#define MAX_SEMAPHORE_COUNT ((semcount_t)(((unsigned long)((semcount_t)(-1))) >> 1))
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#define LOW_PRIORITY 0
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#define NORMAL_PRIORITY 1
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#define HIGH_PRIORITY 2
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typedef struct {
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semcount_t cnt;
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semcount_t limit;
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} gfxSem;
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typedef uint32_t gfxMutex;
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typedef void * gfxThreadHandle;
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#define gfxThreadClose(thread)
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#define gfxMutexDestroy(pmutex)
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#define gfxSemDestroy(psem)
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#define gfxSemCounter(psem) ((psem)->cnt)
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#define gfxSemCounterI(psem) ((psem)->cnt)
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if GOS_RAW_HEAP_SIZE != 0
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void gfxAddHeapBlock(void *ptr, size_t sz);
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#endif
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void gfxHalt(const char *msg);
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void gfxExit(void);
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void *gfxAlloc(size_t sz);
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void *gfxRealloc(void *ptr, size_t oldsz, size_t newsz);
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void gfxFree(void *ptr);
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void gfxYield(void);
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void gfxSleepMilliseconds(delaytime_t ms);
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void gfxSleepMicroseconds(delaytime_t ms);
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systemticks_t gfxSystemTicks(void);
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systemticks_t gfxMillisecondsToTicks(delaytime_t ms);
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void gfxSystemLock(void);
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void gfxSystemUnlock(void);
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void gfxMutexInit(gfxMutex *pmutex);
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void gfxMutexEnter(gfxMutex *pmutex);
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void gfxMutexExit(gfxMutex *pmutex);
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void gfxSemInit(gfxSem *psem, semcount_t val, semcount_t limit);
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bool_t gfxSemWait(gfxSem *psem, delaytime_t ms);
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void gfxSemSignal(gfxSem *psem);
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void gfxSemSignalI(gfxSem *psem);
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gfxThreadHandle gfxThreadCreate(void *stackarea, size_t stacksz, threadpriority_t prio, DECLARE_THREAD_FUNCTION((*fn),p), void *param);
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threadreturn_t gfxThreadWait(gfxThreadHandle thread);
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gfxThreadHandle gfxThreadMe(void);
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#ifdef __cplusplus
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}
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#endif
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#endif /* GFX_USE_OS_RAW32 */
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#endif /* _GOS_RAW32_H */
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@ -2,4 +2,5 @@ GFXSRC += $(GFXLIB)/src/gos/chibios.c \
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$(GFXLIB)/src/gos/win32.c \
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$(GFXLIB)/src/gos/linux.c \
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$(GFXLIB)/src/gos/osx.c \
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$(GFXLIB)/src/gos/raw32.c \
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@ -0,0 +1,742 @@
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/*
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* This file is subject to the terms of the GFX License. If a copy of
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* the license was not distributed with this file, you can obtain one at:
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*
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* http://ugfx.org/license.html
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*/
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/**
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* @file src/gos/raw32.c
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* @brief GOS Raw (bare metal) support.
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*/
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#include "gfx.h"
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#if GFX_USE_OS_RAW32
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#include <string.h> // Prototype for memcpy()
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#if GOS_RAW_HEAP_SIZE != 0
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static void _gosHeapInit(void);
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#else
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#define _gosHeapInit()
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#endif
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static void _gosThreadsInit(void);
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/*********************************************************
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* Initialise
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*********************************************************/
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void _gosInit(void) {
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// Set up the heap allocator
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_gosHeapInit();
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// Start the scheduler
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_gosThreadsInit();
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}
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/*********************************************************
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* For WIn32 emulation - automatically add the tick functions
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* the user would normally have to provide for bare metal.
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*********************************************************/
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#if defined(WIN32)
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#undef Red
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#undef Green
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#undef Blue
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#define WIN32_LEAN_AND_MEAN
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#include <stdio.h>
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#include <windows.h>
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systemticks_t gfxSystemTicks(void) { return GetTickCount(); }
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systemticks_t gfxMillisecondsToTicks(delaytime_t ms) { return ms; }
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#endif
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/*********************************************************
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* Exit everything functions
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*********************************************************/
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void gfxHalt(const char *msg) {
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#if defined(WIN32)
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fprintf(stderr, "%s\n", msg);
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ExitProcess(1);
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#else
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volatile uint32_t dummy;
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(void) msg;
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while(1)
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dummy++;
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#endif
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}
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void gfxExit(void) {
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#if defined(WIN32)
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ExitProcess(0);
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#else
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volatile uint32_t dummy;
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while(1)
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dummy++;
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#endif
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}
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/*********************************************************
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* Head allocation functions
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*********************************************************/
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#if GOS_RAW_HEAP_SIZE == 0
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#include <stdlib.h> // Prototype for malloc(), realloc() and free()
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void *gfxAlloc(size_t sz) {
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return malloc(sz);
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}
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void *gfxRealloc(void *ptr, size_t oldsz, size_t newsz) {
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(void) oldsz;
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return realloc(ptr, newsz);
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}
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void gfxFree(void *ptr) {
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free(ptr);
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}
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#else
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// Slot structure - user memory follows
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typedef struct memslot {
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struct memslot *next; // The next memslot
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size_t sz; // Includes the size of this memslot.
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} memslot;
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// Free Slot - immediately follows the memslot structure
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typedef struct freeslot {
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memslot *nextfree; // The next free slot
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}
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#define GetSlotSize(sz) ((((sz) + (sizeof(freeslot) - 1)) & ~(sizeof(freeslot) - 1)) + sizeof(memslot))
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#define NextFree(pslot) ((freeslot *)Slot2Ptr(pslot))->nextfree
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#define Ptr2Slot(p) ((memslot *)(p) - 1)
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#define Slot2Ptr(pslot) ((pslot)+1)
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static memslot * firstSlot, *lastSlot, *freeSlots;
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static char heap[GOS_RAW_HEAP_SIZE];
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static void _gosHeapInit(void) {
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lastSlot = 0;
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gfxAddHeapBlock(heap, GOS_RAW_HEAP_SIZE);
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}
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void gfxAddHeapBlock(void *ptr, size_t sz) {
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if (sz < sizeof(memslot)+sizeof(freeslot))
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return;
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if (lastSlot)
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lastSlot->next = (memslot *)ptr;
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else
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firstSlot = lastSlot = freeSlot = (memslot *)ptr;
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lastSlot->next = 0;
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lastSlot->sz = sz;
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NextFree(lastSlot) = 0;
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}
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void *gfxAlloc(size_t sz) {
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register memslot *prev, *p, *new;
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if (!sz) return 0;
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sz = GetSlotSize(sz);
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for (prev = 0, p = freeSlots; p != 0; prev = p, p = NextFree(p)) {
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// Loop till we have a block big enough
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if (p->sz < sz)
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continue;
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// Can we save some memory by splitting this block?
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if (p->sz >= sz + sizeof(memslot)+sizeof(freeslot)) {
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new = (memslot *)((char *)p + sz);
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new->next = p->next;
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p->next = new;
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new->sz = p->sz - sz;
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p->sz = sz;
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if (lastSlot == p)
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lastSlot = new;
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NextFree(new) = freeSlots;
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freeSlots = new;
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}
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// Remove it from the free list
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if (prev)
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NextFree(prev) = NextFree(p);
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else
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freeSlots = NextFree(p);
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// Return the result found
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return Slot2Ptr(p);
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}
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// No slots large enough
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return 0;
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}
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void *gfxRealloc(void *ptr, size_t oldsz, size_t sz) {
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register memslot *prev, *p, *new;
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(void) oldsz;
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if (!ptr)
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return gfxAlloc(sz);
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if (!sz) {
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gfxFree(ptr);
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return 0;
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}
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p = Ptr2Slot(ptr);
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sz = GetSlotSize(sz);
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// If the next slot is free (and contiguous) merge it into this one
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if ((char *)p + p->sz == (char *)p->next) {
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for (prev = 0, new = freeSlots; new != 0; prev = new, new = NextFree(new)) {
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if (new == p->next) {
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p->next = new->next;
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p->sz += new->sz;
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if (prev)
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NextFree(prev) = NextFree(new);
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else
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freeSlots = NextFree(new);
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if (lastSlot == new)
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lastSlot = p;
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break;
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}
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}
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}
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// If this block is large enough we are nearly done
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if (sz < p->sz) {
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// Can we save some memory by splitting this block?
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if (p->sz >= sz + sizeof(memslot)+sizeof(freeslot)) {
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new = (memslot *)((char *)p + sz);
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new->next = p->next;
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p->next = new;
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new->sz = p->sz - sz;
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p->sz = sz;
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if (lastSlot == p)
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lastSlot = new;
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NextFree(new) = freeSlots;
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freeSlots = new;
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}
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return Slot2Ptr(p);
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}
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// We need to do this the hard way
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if ((new = gfxAlloc(sz)))
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return 0;
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memcpy(new, ptr, p->sz - sizeof(memslot));
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free(ptr);
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return new;
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}
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void gfxFree(void *ptr) {
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register memslot *prev, *p, *new;
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if (!ptr)
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return;
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p = Ptr2Slot(ptr);
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// If the next slot is free (and contiguous) merge it into this one
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if ((char *)p + p->sz == (char *)p->next) {
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for (prev = 0, new = freeSlots; new != 0; prev = new, new = NextFree(new)) {
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if (new == p->next) {
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p->next = new->next;
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p->sz += new->sz;
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if (prev)
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NextFree(prev) = NextFree(new);
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else
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freeSlots = NextFree(new);
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if (lastSlot == new)
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lastSlot = p;
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break;
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}
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}
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}
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// Add it into the free chain
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NextFree(p) = freeSlots;
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freeSlots = p;
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}
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#endif
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/*********************************************************
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* Semaphores and critical region functions
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*********************************************************/
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#if !defined(INTERRUPTS_OFF) || !defined(INTERRUPTS_ON)
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#define INTERRUPTS_OFF()
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#define INTERRUPTS_ON()
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#endif
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void gfxSystemLock(void) {
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INTERRUPTS_OFF();
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}
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void gfxSystemUnlock(void) {
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INTERRUPTS_ON();
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}
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void gfxMutexInit(gfxMutex *pmutex) {
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pmutex[0] = 0;
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}
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void gfxMutexEnter(gfxMutex *pmutex) {
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INTERRUPTS_OFF();
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while (pmutex[0]) {
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INTERRUPTS_ON();
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gfxYield();
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INTERRUPTS_OFF();
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}
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pmutex[0] = 1;
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INTERRUPTS_ON();
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}
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void gfxMutexExit(gfxMutex *pmutex) {
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pmutex[0] = 0;
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}
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void gfxSemInit(gfxSem *psem, semcount_t val, semcount_t limit) {
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psem->cnt = val;
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psem->limit = limit;
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}
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bool_t gfxSemWait(gfxSem *psem, delaytime_t ms) {
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systemticks_t starttm, delay;
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// Convert our delay to ticks
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switch (ms) {
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case TIME_IMMEDIATE:
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delay = TIME_IMMEDIATE;
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break;
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case TIME_INFINITE:
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delay = TIME_INFINITE;
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break;
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default:
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delay = gfxMillisecondsToTicks(ms);
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if (!delay) delay = 1;
|
||||
starttm = gfxSystemTicks();
|
||||
}
|
||||
|
||||
INTERRUPTS_OFF();
|
||||
while (psem->cnt <= 0) {
|
||||
INTERRUPTS_ON();
|
||||
// Check if we have exceeded the defined delay
|
||||
switch (delay) {
|
||||
case TIME_IMMEDIATE:
|
||||
return FALSE;
|
||||
case TIME_INFINITE:
|
||||
break;
|
||||
default:
|
||||
if (gfxSystemTicks() - starttm >= delay)
|
||||
return FALSE;
|
||||
break;
|
||||
}
|
||||
gfxYield();
|
||||
INTERRUPTS_OFF();
|
||||
}
|
||||
psem->cnt--;
|
||||
INTERRUPTS_ON();
|
||||
return TRUE;
|
||||
}
|
||||
|
||||
void gfxSemSignal(gfxSem *psem) {
|
||||
INTERRUPTS_OFF();
|
||||
gfxSemSignalI(psem);
|
||||
INTERRUPTS_ON();
|
||||
}
|
||||
|
||||
void gfxSemSignalI(gfxSem *psem) {
|
||||
if (psem->cnt < psem->limit)
|
||||
psem->cnt++;
|
||||
}
|
||||
|
||||
/*********************************************************
|
||||
* Sleep functions
|
||||
*********************************************************/
|
||||
|
||||
void gfxSleepMilliseconds(delaytime_t ms) {
|
||||
systemticks_t starttm, delay;
|
||||
|
||||
// Safety first
|
||||
switch (ms) {
|
||||
case TIME_IMMEDIATE:
|
||||
return;
|
||||
case TIME_INFINITE:
|
||||
while(1)
|
||||
gfxYield();
|
||||
return;
|
||||
}
|
||||
|
||||
// Convert our delay to ticks
|
||||
delay = gfxMillisecondsToTicks(ms);
|
||||
starttm = gfxSystemTicks();
|
||||
|
||||
do {
|
||||
gfxYield();
|
||||
} while (gfxSystemTicks() - starttm < delay);
|
||||
}
|
||||
|
||||
void gfxSleepMicroseconds(delaytime_t ms) {
|
||||
systemticks_t starttm, delay;
|
||||
|
||||
// Safety first
|
||||
switch (ms) {
|
||||
case TIME_IMMEDIATE:
|
||||
return;
|
||||
case TIME_INFINITE:
|
||||
while(1)
|
||||
gfxYield();
|
||||
return;
|
||||
}
|
||||
|
||||
// Convert our delay to ticks
|
||||
delay = gfxMillisecondsToTicks(ms/1000);
|
||||
starttm = gfxSystemTicks();
|
||||
|
||||
do {
|
||||
gfxYield();
|
||||
} while (gfxSystemTicks() - starttm < delay);
|
||||
}
|
||||
|
||||
/*********************************************************
|
||||
* Threading functions
|
||||
*********************************************************/
|
||||
|
||||
/**
|
||||
* There are some compilers we know how they store the jmpbuf. For those
|
||||
* we can use the constant MASK1 and MASK2. For others we have to "auto-detect".
|
||||
* Auto-detection is hairy and there is no guarantee it will work on all architectures.
|
||||
* For those it doesn't - read the compiler manuals and the library source code to
|
||||
* work out the correct MASK values.
|
||||
* Using the debugger to work out the values for your compiler and putting them here
|
||||
* also saves a nice block of RAM.
|
||||
*/
|
||||
#if 0
|
||||
#define STACK_DIR_UP FALSE // usually false as most stacks grow down
|
||||
#define MASK1 somevalue1
|
||||
#define MASK2 somevalue2 // optional
|
||||
#define STACK_BASE someindex
|
||||
#else
|
||||
#define AUTO_DETECT_MASK TRUE
|
||||
#define STACK_DIR_UP stackdirup
|
||||
#define MASK1 jmpmask1
|
||||
#define MASK2 jmpmask2
|
||||
#define STACK_BASE stackbase
|
||||
#endif
|
||||
|
||||
#include <setjmp.h> /* jmp_buf, setjmp(), longjmp() */
|
||||
|
||||
/**
|
||||
* Some compilers define a _setjmp() and a setjmp().
|
||||
* The difference between them is that setjmp() saves the signal masks.
|
||||
* That is of no use to us so prefer to use the _setjmp() methods.
|
||||
* If they don't exist compile them to be the standard setjmp() function.
|
||||
* Similarly for longjmp().
|
||||
*/
|
||||
#ifndef setjmp
|
||||
#ifndef _setjmp
|
||||
#define _setjmp setjmp
|
||||
#endif
|
||||
#endif
|
||||
#ifndef longjmp
|
||||
#ifndef _longjmp
|
||||
#define _longjmp longjmp
|
||||
#endif
|
||||
#endif
|
||||
|
||||
typedef struct thread {
|
||||
struct thread * next; // Next thread
|
||||
int flags; // Flags
|
||||
#define FLG_THD_ALLOC 0x0001
|
||||
#define FLG_THD_MAIN 0x0002
|
||||
#define FLG_THD_DEAD 0x0004
|
||||
#define FLG_THD_WAIT 0x0008
|
||||
size_t size; // Size of the thread stack (including this structure)
|
||||
threadreturn_t (*fn)(void *param); // Thread function
|
||||
void * param; // Parameter for the thread function
|
||||
jmp_buf cxt; // The current thread context.
|
||||
// size - sizeof(thread) bytes of stack follow here
|
||||
} thread;
|
||||
|
||||
typedef struct threadQ {
|
||||
thread *head;
|
||||
thread *tail;
|
||||
} threadQ;
|
||||
|
||||
static threadQ readyQ; // The list of ready threads
|
||||
static threadQ deadQ; // Where we put threads waiting to be deallocated
|
||||
static thread * current; // The current running thread
|
||||
static thread mainthread; // The main thread context
|
||||
|
||||
static void Qinit(threadQ * q) {
|
||||
q->head = q->tail = 0;
|
||||
}
|
||||
|
||||
static void Qadd(threadQ * q, thread *t) {
|
||||
t->next = 0;
|
||||
if (q->tail) {
|
||||
q->tail->next = t;
|
||||
q->tail = t;
|
||||
} else
|
||||
q->head = q->tail = t;
|
||||
}
|
||||
|
||||
static thread *Qpop(threadQ * q) {
|
||||
struct thread * t;
|
||||
|
||||
if (!q->head)
|
||||
return 0;
|
||||
t = q->head;
|
||||
q->head = t->next;
|
||||
return t;
|
||||
}
|
||||
|
||||
#if AUTO_DETECT_MASK
|
||||
static char * lowptr; // A pointer to somewhere low in the stack frame
|
||||
static char * highptr; // A pointer to somewhere high in the stack frame
|
||||
|
||||
// The saved information on a stack frame
|
||||
typedef struct saveloc {
|
||||
char * localptr;
|
||||
jmp_buf cxt;
|
||||
} saveloc;
|
||||
|
||||
static saveloc infn; // The saved stack frame info inside a function
|
||||
static saveloc outfn; // The saved stack frame info outside a function
|
||||
static saveloc *saveptr; // Which saved stack frame variable we are currently using
|
||||
|
||||
// Where we save all the information
|
||||
static bool_t stackdirup; // TRUE if the stack grow up instead of down
|
||||
static uint32_t jmpmask1; // The 1st mask of jmp_buf elements that need relocation
|
||||
static uint32_t jmpmask2; // The 2nd mask of jmp_buf elements that need relocation
|
||||
static size_t stackbase; // The base of the stack frame relative to the local variables
|
||||
|
||||
/* These functions are not static to prevent the compiler removing them as functions */
|
||||
|
||||
void get_highptr(void) {
|
||||
char c;
|
||||
highptr = &c;
|
||||
}
|
||||
|
||||
void test_stack(void) {
|
||||
char c;
|
||||
saveptr->localptr = (char *)&c;
|
||||
_setjmp(saveptr->cxt);
|
||||
get_highptr();
|
||||
}
|
||||
|
||||
void get_stack_state(void) {
|
||||
char c;
|
||||
lowptr = &c;
|
||||
test_stack();
|
||||
}
|
||||
|
||||
void get_stack_state_in_fn(void) {
|
||||
get_stack_state();
|
||||
}
|
||||
#endif
|
||||
|
||||
static void _gosThreadsInit(void) {
|
||||
Qinit(&readyQ);
|
||||
current = &mainthread;
|
||||
current->next = 0;
|
||||
current->size = sizeof(thread);
|
||||
current->flags = FLG_THD_MAIN;
|
||||
current->fn = 0;
|
||||
current->param = 0;
|
||||
|
||||
#if AUTO_DETECT_MASK
|
||||
// Get details of the stack frame from within a function
|
||||
saveptr = &infn;
|
||||
get_stack_state_in_fn();
|
||||
|
||||
// Get details of the stack frame outside the function
|
||||
saveptr = &outfn;
|
||||
get_stack_state();
|
||||
|
||||
/* stack direction */
|
||||
stackdirup = highptr > lowptr; // Can we also test infn.localptr > outfn.localptr?
|
||||
|
||||
/* study the jump buffer */
|
||||
{
|
||||
uint32_t i;
|
||||
char ** pout;
|
||||
char ** pin;
|
||||
size_t diff = outfn.localptr - infn.localptr;
|
||||
char * min_frame = outfn.localptr;
|
||||
|
||||
/* following line views jump buffer as array of long int */
|
||||
pout = (char **)outfn.cxt;
|
||||
pin = (char **)infn.cxt;
|
||||
|
||||
jmpmask1 = jmpmask2 = 0;
|
||||
if (diff) {
|
||||
for (i = 0; i < sizeof(jmp_buf)/sizeof(char *); i++, pout++, pin++) {
|
||||
if ((size_t)(*pout - *pin) == diff) {
|
||||
/* record frame dependency */
|
||||
if (i < 32)
|
||||
jmpmask1 |= 1 << i;
|
||||
else
|
||||
jmpmask2 |= 1 << (i-32);
|
||||
|
||||
if (stackdirup) {
|
||||
if (min_frame > *pout) {
|
||||
min_frame = *pout;
|
||||
}
|
||||
} else {
|
||||
if (min_frame < *pout) {
|
||||
min_frame = *pout;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (stackdirup) {
|
||||
stackbase = outfn.localptr - min_frame;
|
||||
} else {
|
||||
stackbase = min_frame - outfn.localptr;
|
||||
}
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
gfxThreadHandle gfxThreadMe(void) {
|
||||
return (gfxThreadHandle)current;
|
||||
}
|
||||
|
||||
void gfxYield(void) {
|
||||
if (!_setjmp(current->cxt)) {
|
||||
// Add us back to the Queue
|
||||
Qadd(&readyQ, current);
|
||||
|
||||
// Check if there are dead processes to deallocate
|
||||
while ((current = Qpop(&deadQ)))
|
||||
gfxFree(current);
|
||||
|
||||
// Run the next process
|
||||
current = Qpop(&readyQ);
|
||||
_longjmp(current->cxt, 1);
|
||||
}
|
||||
}
|
||||
|
||||
// This routine is not currently public - but it could be.
|
||||
void gfxThreadExit(threadreturn_t ret) {
|
||||
// Save the results
|
||||
current->param = (void *)ret;
|
||||
current->flags |= FLG_THD_DEAD;
|
||||
|
||||
// Add us to the dead list if we need deallocation as we can't free ourselves.
|
||||
// If someone is waiting on the thread they will do the cleanup.
|
||||
if ((current->flags & (FLG_THD_ALLOC|FLG_THD_WAIT)) == FLG_THD_ALLOC)
|
||||
Qadd(&deadQ, current);
|
||||
|
||||
// Switch to the next task
|
||||
current = Qpop(&readyQ);
|
||||
if (!current)
|
||||
gfxExit(); // Oops - this should never happen!
|
||||
_longjmp(current->cxt, 1);
|
||||
}
|
||||
|
||||
gfxThreadHandle gfxThreadCreate(void *stackarea, size_t stacksz, threadpriority_t prio, DECLARE_THREAD_FUNCTION((*fn),p), void *param) {
|
||||
thread * t;
|
||||
(void) prio;
|
||||
|
||||
// Ensure we have a minimum stack size
|
||||
if (stacksz < sizeof(thread)+64) {
|
||||
stacksz = sizeof(thread)+64;
|
||||
stackarea = 0;
|
||||
}
|
||||
|
||||
if (stackarea) {
|
||||
t = (thread *)stackarea;
|
||||
t->flags = 0;
|
||||
} else {
|
||||
t = (thread *)gfxAlloc(stacksz);
|
||||
if (!t)
|
||||
return 0;
|
||||
t->flags = FLG_THD_ALLOC;
|
||||
}
|
||||
t->size = stacksz;
|
||||
t->fn = fn;
|
||||
t->param = param;
|
||||
if (_setjmp(t->cxt)) {
|
||||
// This is the new thread - call the function!
|
||||
gfxThreadExit(current->fn(current->param));
|
||||
|
||||
// We never get here
|
||||
return 0;
|
||||
}
|
||||
|
||||
// Move the stack frame and relocate the context data
|
||||
{
|
||||
char ** s;
|
||||
char * nf;
|
||||
int diff;
|
||||
uint32_t i;
|
||||
|
||||
// Copy the stack frame
|
||||
#if AUTO_DETECT_MASK
|
||||
if (STACK_DIR_UP) { // Stack grows up
|
||||
nf = (char *)(t) + sizeof(thread) + stackbase;
|
||||
memcpy(t+1, (char *)&t - stackbase, stackbase+sizeof(char *));
|
||||
} else { // Stack grows down
|
||||
nf = (char *)(t) + stacksz - (stackbase + sizeof(char *));
|
||||
memcpy(nf, &t, stackbase+sizeof(char *));
|
||||
}
|
||||
#elif STACK_DIR_UP
|
||||
// Stack grows up
|
||||
nf = (char *)(t) + sizeof(thread) + stackbase;
|
||||
memcpy(t+1, (char *)&t - stackbase, stackbase+sizeof(char *));
|
||||
#else
|
||||
// Stack grows down
|
||||
nf = (char *)(t) + size - (stackbase + sizeof(char *));
|
||||
memcpy(nf, &t, stackbase+sizeof(char *));
|
||||
#endif
|
||||
|
||||
// Relocate the context data
|
||||
s = (char **)(t->cxt);
|
||||
diff = nf - (char *)&t;
|
||||
|
||||
// Relocate the elements we know need to be relocated
|
||||
for (i = 1; i && i < MASK1; i <<= 1, s++) {
|
||||
if ((MASK1 & i))
|
||||
*s += diff;
|
||||
}
|
||||
#ifdef MASK2
|
||||
for (i = 1; i && i < MASK2; i <<= 1, s++) {
|
||||
if ((MASK1 & i))
|
||||
*s += diff;
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
// Add this thread to the ready queue
|
||||
Qadd(&readyQ, t);
|
||||
return t;
|
||||
}
|
||||
|
||||
threadreturn_t gfxThreadWait(gfxThreadHandle th) {
|
||||
thread * t;
|
||||
|
||||
t = th;
|
||||
if (t == current)
|
||||
return -1;
|
||||
|
||||
// Mark that we are waiting
|
||||
t->flags |= FLG_THD_WAIT;
|
||||
|
||||
// Wait for the thread to die
|
||||
while(!(t->flags & FLG_THD_DEAD))
|
||||
gfxYield();
|
||||
|
||||
// Unmark
|
||||
t->flags &= ~FLG_THD_WAIT;
|
||||
|
||||
// Clean up resources if needed
|
||||
if (t->flags & FLG_THD_ALLOC)
|
||||
gfxFree(t);
|
||||
|
||||
// Return the status left by the dead process
|
||||
return (threadreturn_t)t->param;
|
||||
}
|
||||
|
||||
#endif /* GFX_USE_OS_RAW32 */
|
||||
Loading…
Reference in New Issue