//----静态创建线程-------------------------------------------------------------
//功能：为事件类型创建线程，初始化上下文环境，安装执行函数，构成完整线程
//参数：evtt_id，待创建的线程所服务的事件类型id
//返回：新创建的线程指针
//注: 移植敏感函数
//-----------------------------------------------------------------------------
struct tagThreadVm *__CreateStaticThread(struct tagEventType *evtt,void *Stack,
u32 StackSize)
{
struct tagThreadVm *result;
result = (struct tagThreadVm *)align_up_sys(Stack);
#if CN_CFG_STACK_FILL != 0
memset(Stack,CN_CFG_STACK_FILL,StackSize);
#endif
//看实际分配了多少内存，djyos内存分配使用块相联策略，如果分配的内存量大于
//申请量，可以保证其实际尺寸是对齐的。之所以注释掉，是因为当len大于申请量时，
//对齐只是实际结果，而不是内存管理的规定动作，如果不注释掉，就要求内存管理
//模块必须提供对齐的结果，对模块独立性是不利的。
// len = M_CheckSize(result);
result->stack_top = (u32 *)(align_down_sys((ptu32_t)Stack+StackSize)); //栈顶地址，移植敏感
result->next = NULL;
result->stack_size = (ptu32_t)(result->stack_top) - (ptu32_t)result
- sizeof(struct tagThreadVm); //保存栈深度
result->host_vm = NULL;
//复位线程并重置线程
__asm_reset_thread(evtt->thread_routine,result);
return result;
}
void __memHeapScan(void)
{
struct tagHeapCB *HeapTemp;
struct tagHeapCession *Cession;
u32 CessionNum,Ctrlsize,NameLen,n;
u8 *Offset;
u32 *u32Offset;
u32 HeapNo=0;
u32 AlignSize;
Offset = (u8*)&pHeapList;
CessionNum = *(u32*)Offset;
while(CessionNum != 0) //本循环取得所需堆控制块数量
{
u32Offset = (u32*)Offset + 1;
AlignSize = *u32Offset++;
//以下计算公式，参看lds文件格式
Offset += sizeof(u32)*3*CessionNum + 2*sizeof(u32);
NameLen = __memStrLen((char*)Offset);
//计算heap控制块和session控制块所需要的内存尺寸。
Ctrlsize = NameLen + 1 + sizeof( struct tagHeapCB )
+ CessionNum * sizeof(struct tagHeapCession);
Ctrlsize = align_up_sys(Ctrlsize);
Cession = NULL;
//下面for循环功能:
//1、扫描所有session，找到第一个满足Ctrlsize需求的session。
//2、在该session顶部分配用于控制结构的内存。
//3、丢弃size小于Ctrlsize的session。
//4、按准静态分配的要求初始化heap控制块和session控制块。
//5、把所有的session连接成链表
for(n = 0; n < CessionNum; n++)
{
if(Cession != NULL)
{
Cession->static_bottom = (void*)(*u32Offset);
Cession->heap_bottom = (void*)(*u32Offset);
Cession->heap_top = (void*)(*(u32Offset+1));
#if ((CN_CFG_DYNAMIC_MEM == 1))
Cession->PageSize = *(u32Offset+2);
#endif
if(n == CessionNum -1)
Cession->Next = NULL;
else
Cession->Next = Cession+1;
Cession++;
}
//找到了第一个符合要求的session
if((Cession == NULL) && ((*(u32Offset+1) - *u32Offset) >=Ctrlsize))
{
HeapTemp = (struct tagHeapCB *)(*(u32Offset+1) - Ctrlsize);
HeapTemp = (struct tagHeapCB *)align_down_sys(HeapTemp);
if(tg_pHeapList == NULL)
{
tg_pHeapList = HeapTemp;
tg_pHeapList->NextHeap = HeapTemp;
tg_pHeapList->PreHeap = HeapTemp;
//第一个堆可做系统堆。
if(HeapNo == 0)
tg_pSysHeap = tg_pHeapList;
}
else
{
HeapTemp->NextHeap = tg_pHeapList;
HeapTemp->PreHeap = tg_pHeapList->PreHeap;
tg_pHeapList->PreHeap->NextHeap = HeapTemp;
tg_pHeapList->PreHeap = HeapTemp;
}
Cession = (struct tagHeapCession*)(HeapTemp + 1);
HeapTemp->Cession = Cession;
HeapTemp->CessionNum = CessionNum - n;
if(AlignSize == 0)
HeapTemp->AlignSize = CN_ALIGN_SIZE;
else
HeapTemp->AlignSize = AlignSize;
HeapTemp->HeapName = (char *)Offset;
#if ((CN_CFG_DYNAMIC_MEM == 1))
HeapTemp->mem_sync = NULL;
#endif
Cession->static_bottom = (void*)(*u32Offset);
Cession->heap_bottom = (void*)(*u32Offset);
Cession->heap_top = (void*)HeapTemp;
#if ((CN_CFG_DYNAMIC_MEM == 1))
Cession->PageSize = *(u32Offset+2);
#endif
if(n == CessionNum -1)
Cession->Next = NULL;
else
Cession->Next = Cession+1;
Cession++;
}
Ctrlsize -= sizeof(struct tagHeapCession);
u32Offset += 3;
}
Offset += NameLen + 1; //+1跨过串结束符
Offset = (u8*)align_up(sizeof(u32),Offset);
CessionNum = *(u32*)Offset;
HeapNo++;
}
}
