int _start(void)
{
enableMMU();
vectorCopy();//拷贝中断向量表
enableInterruptCPSR();
enableExt(64, 26,4, 0);
return 0;
}
int main()
{
if(enableMMU()!=0)
return 1;
auto tcr = RegTCR_EL1::read();
auto ttbr1Mask = upperMaskBits(tcr.T1SZ);
// 将sp, x29(base pointer) 的高位置为1
__asm__ __volatile__(
"mov x0,sp \n\t"
"orr x0,x0,%0 \n\t"
"mov sp,x0 \n\t"
"orr x29,x29, %0 \n\t"::"r"(ttbr1Mask):"sp","x0");
// 跳转到高地址处
extern char mainStart[];
RegPC pc;
pc.PC = reinterpret_cast<uint64_t>(mainStart) | ttbr1Mask;
pc.write();
ASM_DEFINE_LOCAL_SYM(mainStart);
// 重新初始化内存管理器
extern char ramStart[];
extern char ramEnd[];
size_t ramSize = static_cast<size_t>(ramEnd - ramStart);
new (&mman) MemoryManager( reinterpret_cast<void*>(reinterpret_cast<uint64_t>(ramStart)|ttbr1Mask), ramSize,true );
// 重新初始化pidManager
new (&pidManager) PidManager();
new (&processManager) ProcessManager();
new (&systemFeatures) SystemFeatures();
new (&pl011) PL011(reinterpret_cast<volatile void*>(UART_BASE|ttbr1Mask));
new (&kin) Input();
new (&kout) Output();
// kout << "&mman = " << &mman << "\n";
systemFeatures.updatePreconfigured();
systemFeatures.cores(4);
systemFeatures.architecture(Architecture::AARCH64);
systemFeatures.asidSelector(0);
// my tests here
// // qemu 在从终端输入时，总是buffered模式，只有回车之后才会将数据写入到串口的缓冲区里，因此只要数据是一次读完就能成功读取
// char ch=0;
// while( (ch=kin.getchar())!='\n')
// kout << ch;
// kout << "\n";
// kout << "echo end\n";
//
// asm_wfe_loop();
// RAMFile file("file1");
// kout << "diskSize = " << file.diskSize() << "\n";
// file.emplaceAppend("what is the f**k");
// kout << "content = " << file.content() << "\n";
// kout << "now diskSize = " << file.diskSize() << "\n";
// asm_wfe_loop();
// 建立一个进程
auto processLink = processManager.createNewProcess(
64 - tcr.T0SZ, // virtual address length in bits
nullptr, // parent
10, // Priority
USER_SPACE_SIZE, // codeSize
Process::PAGE_SIZE * Process::HEAP_L3_ENTRY_NUM, // Heap Size
Process::PAGE_SIZE * Process::STACK_L3_ENTRY_NUM // Stack Size
);
Process & process = processLink->data<true>();
if(processLink==nullptr ||
process.status()==Process::CREATED_INCOMPLETE)
{
kout << FATAL << "create process failed\n";
return 1;
}
// 复制代码到分配给进程的代码段空间
const void *userSpaceStart = reinterpret_cast<const void*>(USER_SPACE_START | ttbr1Mask);
std::memcpy(process.codeBase(), userSpaceStart, USER_SPACE_SIZE);
process.registers()[30] = process.ELR().returnAddr;
// 使用任务调度切换到下一个进程
processManager.changeProcessStatus(processLink, Process::RUNNING);
void *spEL1=reinterpret_cast<void*>(reinterpret_cast<uint64_t>(__stack_top)|ttbr1Mask);
process.restoreContextAndExecute(spEL1);
return 0;
}
