1 pub mod barrier; 2 pub mod bump; 3 mod c_adapter; 4 5 use alloc::vec::Vec; 6 use hashbrown::HashSet; 7 use x86::time::rdtsc; 8 use x86_64::registers::model_specific::EferFlags; 9 10 use crate::driver::tty::serial::serial8250::send_to_default_serial8250_port; 11 use crate::include::bindings::bindings::{ 12 multiboot2_get_load_base, multiboot2_get_memory, multiboot2_iter, multiboot_mmap_entry_t, 13 multiboot_tag_load_base_addr_t, 14 }; 15 use crate::libs::align::page_align_up; 16 use crate::libs::lib_ui::screen_manager::scm_disable_put_to_window; 17 use crate::libs::printk::PrintkWriter; 18 use crate::libs::spinlock::SpinLock; 19 20 use crate::mm::allocator::page_frame::{FrameAllocator, PageFrameCount, PageFrameUsage}; 21 use crate::mm::memblock::mem_block_manager; 22 use crate::mm::mmio_buddy::mmio_init; 23 use crate::{ 24 arch::MMArch, 25 mm::allocator::{buddy::BuddyAllocator, bump::BumpAllocator}, 26 }; 27 28 use crate::mm::kernel_mapper::KernelMapper; 29 use crate::mm::page::{PageEntry, PageFlags}; 30 use crate::mm::{MemoryManagementArch, PageTableKind, PhysAddr, VirtAddr}; 31 use crate::{kdebug, kinfo, kwarn}; 32 use system_error::SystemError; 33 34 use core::arch::asm; 35 use core::ffi::c_void; 36 use core::fmt::{Debug, Write}; 37 use core::mem::{self}; 38 39 use core::sync::atomic::{compiler_fence, AtomicBool, Ordering}; 40 41 use super::kvm::vmx::vmcs::VmcsFields; 42 use super::kvm::vmx::vmx_asm_wrapper::vmx_vmread; 43 44 pub type PageMapper = 45 crate::mm::page::PageMapper<crate::arch::x86_64::mm::X86_64MMArch, LockedFrameAllocator>; 46 47 /// 初始的CR3寄存器的值，用于内存管理初始化时，创建的第一个内核页表的位置 48 static mut INITIAL_CR3_VALUE: PhysAddr = PhysAddr::new(0); 49 50 /// 内核的第一个页表在pml4中的索引 51 /// 顶级页表的[256, 512)项是内核的页表 52 static KERNEL_PML4E_NO: usize = (X86_64MMArch::PHYS_OFFSET & ((1 << 48) - 1)) >> 39; 53 54 static INNER_ALLOCATOR: SpinLock<Option<BuddyAllocator<MMArch>>> = SpinLock::new(None); 55 56 #[derive(Clone, Copy, Debug)] 57 pub struct X86_64MMBootstrapInfo { 58 kernel_load_base_paddr: usize, 59 kernel_code_start: usize, 60 kernel_code_end: usize, 61 kernel_data_end: usize, 62 kernel_rodata_end: usize, 63 start_brk: usize, 64 } 65 66 pub(super) static mut BOOTSTRAP_MM_INFO: Option<X86_64MMBootstrapInfo> = None; 67 68 /// @brief X86_64的内存管理架构结构体 69 #[derive(Debug, Clone, Copy, Hash)] 70 pub struct X86_64MMArch; 71 72 /// XD标志位是否被保留 73 static XD_RESERVED: AtomicBool = AtomicBool::new(false); 74 75 impl MemoryManagementArch for X86_64MMArch { 76 /// 4K页 77 const PAGE_SHIFT: usize = 12; 78 79 /// 每个页表项占8字节，总共有512个页表项 80 const PAGE_ENTRY_SHIFT: usize = 9; 81 82 /// 四级页表（PML4T、PDPT、PDT、PT） 83 const PAGE_LEVELS: usize = 4; 84 85 /// 页表项的有效位的index。在x86_64中，页表项的第[0, 47]位表示地址和flag， 86 /// 第[48, 51]位表示保留。因此，有效位的index为52。 87 /// 请注意，第63位是XD位，表示是否允许执行。 88 const ENTRY_ADDRESS_SHIFT: usize = 52; 89 90 const ENTRY_FLAG_DEFAULT_PAGE: usize = Self::ENTRY_FLAG_PRESENT; 91 92 const ENTRY_FLAG_DEFAULT_TABLE: usize = Self::ENTRY_FLAG_PRESENT; 93 94 const ENTRY_FLAG_PRESENT: usize = 1 << 0; 95 96 const ENTRY_FLAG_READONLY: usize = 0; 97 98 const ENTRY_FLAG_READWRITE: usize = 1 << 1; 99 100 const ENTRY_FLAG_USER: usize = 1 << 2; 101 102 const ENTRY_FLAG_WRITE_THROUGH: usize = 1 << 3; 103 104 const ENTRY_FLAG_CACHE_DISABLE: usize = 1 << 4; 105 106 const ENTRY_FLAG_NO_EXEC: usize = 1 << 63; 107 /// x86_64不存在EXEC标志位，只有NO_EXEC（XD）标志位 108 const ENTRY_FLAG_EXEC: usize = 0; 109 110 /// 物理地址与虚拟地址的偏移量 111 /// 0xffff_8000_0000_0000 112 const PHYS_OFFSET: usize = Self::PAGE_NEGATIVE_MASK + (Self::PAGE_ADDRESS_SIZE >> 1); 113 114 const USER_END_VADDR: VirtAddr = VirtAddr::new(0x0000_7eff_ffff_ffff); 115 const USER_BRK_START: VirtAddr = VirtAddr::new(0x700000000000); 116 const USER_STACK_START: VirtAddr = VirtAddr::new(0x6ffff0a00000); 117 118 /// @brief 获取物理内存区域 119 unsafe fn init() { 120 extern "C" { 121 fn _text(); 122 fn _etext(); 123 fn _edata(); 124 fn _erodata(); 125 fn _end(); 126 } 127 128 Self::init_xd_rsvd(); 129 let load_base_paddr = Self::get_load_base_paddr(); 130 131 let bootstrap_info = X86_64MMBootstrapInfo { 132 kernel_load_base_paddr: load_base_paddr.data(), 133 kernel_code_start: _text as usize, 134 kernel_code_end: _etext as usize, 135 kernel_data_end: _edata as usize, 136 kernel_rodata_end: _erodata as usize, 137 start_brk: _end as usize, 138 }; 139 140 unsafe { 141 BOOTSTRAP_MM_INFO = Some(bootstrap_info); 142 } 143 144 // 初始化物理内存区域(从multiboot2中获取) 145 Self::init_memory_area_from_multiboot2().expect("init memory area failed"); 146 147 send_to_default_serial8250_port("x86 64 init end\n\0".as_bytes()); 148 } 149 150 /// @brief 刷新TLB中，关于指定虚拟地址的条目 151 unsafe fn invalidate_page(address: VirtAddr) { 152 compiler_fence(Ordering::SeqCst); 153 asm!("invlpg [{0}]", in(reg) address.data(), options(nostack, preserves_flags)); 154 compiler_fence(Ordering::SeqCst); 155 } 156 157 /// @brief 刷新TLB中，所有的条目 158 unsafe fn invalidate_all() { 159 compiler_fence(Ordering::SeqCst); 160 // 通过设置cr3寄存器，来刷新整个TLB 161 Self::set_table(PageTableKind::User, Self::table(PageTableKind::User)); 162 compiler_fence(Ordering::SeqCst); 163 } 164 165 /// @brief 获取顶级页表的物理地址 166 unsafe fn table(table_kind: PageTableKind) -> PhysAddr { 167 match table_kind { 168 PageTableKind::Kernel | PageTableKind::User => { 169 let paddr: usize; 170 compiler_fence(Ordering::SeqCst); 171 asm!("mov {}, cr3", out(reg) paddr, options(nomem, nostack, preserves_flags)); 172 compiler_fence(Ordering::SeqCst); 173 return PhysAddr::new(paddr); 174 } 175 PageTableKind::EPT => { 176 let eptp = 177 vmx_vmread(VmcsFields::CTRL_EPTP_PTR as u32).expect("Failed to read eptp"); 178 return PhysAddr::new(eptp as usize); 179 } 180 } 181 } 182 183 /// @brief 设置顶级页表的物理地址到处理器中 184 unsafe fn set_table(_table_kind: PageTableKind, table: PhysAddr) { 185 compiler_fence(Ordering::SeqCst); 186 asm!("mov cr3, {}", in(reg) table.data(), options(nostack, preserves_flags)); 187 compiler_fence(Ordering::SeqCst); 188 } 189 190 /// @brief 判断虚拟地址是否合法 191 fn virt_is_valid(virt: VirtAddr) -> bool { 192 return virt.is_canonical(); 193 } 194 195 /// 获取内存管理初始化时，创建的第一个内核页表的地址 196 fn initial_page_table() -> PhysAddr { 197 unsafe { 198 return INITIAL_CR3_VALUE; 199 } 200 } 201 202 /// @brief 创建新的顶层页表 203 /// 204 /// 该函数会创建页表并复制内核的映射到新的页表中 205 /// 206 /// @return 新的页表 207 fn setup_new_usermapper() -> Result<crate::mm::ucontext::UserMapper, SystemError> { 208 let new_umapper: crate::mm::page::PageMapper<X86_64MMArch, LockedFrameAllocator> = unsafe { 209 PageMapper::create(PageTableKind::User, LockedFrameAllocator) 210 .ok_or(SystemError::ENOMEM)? 211 }; 212 213 let current_ktable: KernelMapper = KernelMapper::lock(); 214 let copy_mapping = |pml4_entry_no| unsafe { 215 let entry: PageEntry<X86_64MMArch> = current_ktable 216 .table() 217 .entry(pml4_entry_no) 218 .unwrap_or_else(|| panic!("entry {} not found", pml4_entry_no)); 219 new_umapper.table().set_entry(pml4_entry_no, entry) 220 }; 221 222 // 复制内核的映射 223 for pml4_entry_no in KERNEL_PML4E_NO..512 { 224 copy_mapping(pml4_entry_no); 225 } 226 227 return Ok(crate::mm::ucontext::UserMapper::new(new_umapper)); 228 } 229 230 const PAGE_SIZE: usize = 1 << Self::PAGE_SHIFT; 231 232 const PAGE_OFFSET_MASK: usize = Self::PAGE_SIZE - 1; 233 234 const PAGE_MASK: usize = !(Self::PAGE_OFFSET_MASK); 235 236 const PAGE_ADDRESS_SHIFT: usize = Self::PAGE_LEVELS * Self::PAGE_ENTRY_SHIFT + Self::PAGE_SHIFT; 237 238 const PAGE_ADDRESS_SIZE: usize = 1 << Self::PAGE_ADDRESS_SHIFT; 239 240 const PAGE_ADDRESS_MASK: usize = Self::PAGE_ADDRESS_SIZE - Self::PAGE_SIZE; 241 242 const PAGE_ENTRY_SIZE: usize = 1 << (Self::PAGE_SHIFT - Self::PAGE_ENTRY_SHIFT); 243 244 const PAGE_ENTRY_NUM: usize = 1 << Self::PAGE_ENTRY_SHIFT; 245 246 const PAGE_ENTRY_MASK: usize = Self::PAGE_ENTRY_NUM - 1; 247 248 const PAGE_NEGATIVE_MASK: usize = !((Self::PAGE_ADDRESS_SIZE) - 1); 249 250 const ENTRY_ADDRESS_SIZE: usize = 1 << Self::ENTRY_ADDRESS_SHIFT; 251 252 const ENTRY_ADDRESS_MASK: usize = Self::ENTRY_ADDRESS_SIZE - Self::PAGE_SIZE; 253 254 const ENTRY_FLAGS_MASK: usize = !Self::ENTRY_ADDRESS_MASK; 255 256 unsafe fn read<T>(address: VirtAddr) -> T { 257 return core::ptr::read(address.data() as *const T); 258 } 259 260 unsafe fn write<T>(address: VirtAddr, value: T) { 261 core::ptr::write(address.data() as *mut T, value); 262 } 263 264 unsafe fn write_bytes(address: VirtAddr, value: u8, count: usize) { 265 core::ptr::write_bytes(address.data() as *mut u8, value, count); 266 } 267 268 unsafe fn phys_2_virt(phys: PhysAddr) -> Option<VirtAddr> { 269 if let Some(vaddr) = phys.data().checked_add(Self::PHYS_OFFSET) { 270 return Some(VirtAddr::new(vaddr)); 271 } else { 272 return None; 273 } 274 } 275 276 unsafe fn virt_2_phys(virt: VirtAddr) -> Option<PhysAddr> { 277 if let Some(paddr) = virt.data().checked_sub(Self::PHYS_OFFSET) { 278 return Some(PhysAddr::new(paddr)); 279 } else { 280 return None; 281 } 282 } 283 } 284 285 impl X86_64MMArch { 286 unsafe fn get_load_base_paddr() -> PhysAddr { 287 let mut mb2_lb_info: [multiboot_tag_load_base_addr_t; 512] = mem::zeroed(); 288 send_to_default_serial8250_port("get_load_base_paddr begin\n\0".as_bytes()); 289 290 let mut mb2_count: u32 = 0; 291 multiboot2_iter( 292 Some(multiboot2_get_load_base), 293 &mut mb2_lb_info as *mut [multiboot_tag_load_base_addr_t; 512] as usize as *mut c_void, 294 &mut mb2_count, 295 ); 296 297 if mb2_count == 0 { 298 send_to_default_serial8250_port( 299 "get_load_base_paddr mb2_count == 0, default to 1MB\n\0".as_bytes(), 300 ); 301 return PhysAddr::new(0x100000); 302 } 303 304 let phys = mb2_lb_info[0].load_base_addr as usize; 305 306 return PhysAddr::new(phys); 307 } 308 unsafe fn init_memory_area_from_multiboot2() -> Result<usize, SystemError> { 309 // 这个数组用来存放内存区域的信息（从C获取） 310 let mut mb2_mem_info: [multiboot_mmap_entry_t; 512] = mem::zeroed(); 311 send_to_default_serial8250_port("init_memory_area_from_multiboot2 begin\n\0".as_bytes()); 312 313 let mut mb2_count: u32 = 0; 314 multiboot2_iter( 315 Some(multiboot2_get_memory), 316 &mut mb2_mem_info as *mut [multiboot_mmap_entry_t; 512] as usize as *mut c_void, 317 &mut mb2_count, 318 ); 319 send_to_default_serial8250_port("init_memory_area_from_multiboot2 2\n\0".as_bytes()); 320 321 let mb2_count = mb2_count as usize; 322 let mut areas_count = 0usize; 323 let mut total_mem_size = 0usize; 324 for i in 0..mb2_count { 325 // Only use the memory area if its type is 1 (RAM) 326 if mb2_mem_info[i].type_ == 1 { 327 // Skip the memory area if its len is 0 328 if mb2_mem_info[i].len == 0 { 329 continue; 330 } 331 332 total_mem_size += mb2_mem_info[i].len as usize; 333 // PHYS_MEMORY_AREAS[areas_count].base = PhysAddr::new(mb2_mem_info[i].addr as usize); 334 // PHYS_MEMORY_AREAS[areas_count].size = mb2_mem_info[i].len as usize; 335 336 mem_block_manager() 337 .add_block( 338 PhysAddr::new(mb2_mem_info[i].addr as usize), 339 mb2_mem_info[i].len as usize, 340 ) 341 .unwrap_or_else(|e| { 342 kwarn!( 343 "Failed to add memory block: base={:#x}, size={:#x}, error={:?}", 344 mb2_mem_info[i].addr, 345 mb2_mem_info[i].len, 346 e 347 ); 348 }); 349 areas_count += 1; 350 } 351 } 352 send_to_default_serial8250_port("init_memory_area_from_multiboot2 end\n\0".as_bytes()); 353 kinfo!("Total memory size: {} MB, total areas from multiboot2: {mb2_count}, valid areas: {areas_count}", total_mem_size / 1024 / 1024); 354 return Ok(areas_count); 355 } 356 357 fn init_xd_rsvd() { 358 // 读取ia32-EFER寄存器的值 359 let efer: EferFlags = x86_64::registers::model_specific::Efer::read(); 360 if !efer.contains(EferFlags::NO_EXECUTE_ENABLE) { 361 // NO_EXECUTE_ENABLE是false，那么就设置xd_reserved为true 362 kdebug!("NO_EXECUTE_ENABLE is false, set XD_RESERVED to true"); 363 XD_RESERVED.store(true, Ordering::Relaxed); 364 } 365 compiler_fence(Ordering::SeqCst); 366 } 367 368 /// 判断XD标志位是否被保留 369 pub fn is_xd_reserved() -> bool { 370 // return XD_RESERVED.load(Ordering::Relaxed); 371 372 // 由于暂时不支持execute disable，因此直接返回true 373 // 不支持的原因是，目前好像没有能正确的设置page-level的xd位，会触发page fault 374 return true; 375 } 376 } 377 378 impl VirtAddr { 379 /// @brief 判断虚拟地址是否合法 380 #[inline(always)] 381 pub fn is_canonical(self) -> bool { 382 let x = self.data() & X86_64MMArch::PHYS_OFFSET; 383 // 如果x为0，说明虚拟地址的高位为0，是合法的用户地址 384 // 如果x为PHYS_OFFSET，说明虚拟地址的高位全为1，是合法的内核地址 385 return x == 0 || x == X86_64MMArch::PHYS_OFFSET; 386 } 387 } 388 389 /// @brief 初始化内存管理模块 390 pub fn mm_init() { 391 send_to_default_serial8250_port("mm_init\n\0".as_bytes()); 392 PrintkWriter 393 .write_fmt(format_args!("mm_init() called\n")) 394 .unwrap(); 395 // printk_color!(GREEN, BLACK, "mm_init() called\n"); 396 static _CALL_ONCE: AtomicBool = AtomicBool::new(false); 397 if _CALL_ONCE 398 .compare_exchange(false, true, Ordering::SeqCst, Ordering::SeqCst) 399 .is_err() 400 { 401 send_to_default_serial8250_port("mm_init err\n\0".as_bytes()); 402 panic!("mm_init() can only be called once"); 403 } 404 405 unsafe { X86_64MMArch::init() }; 406 kdebug!("bootstrap info: {:?}", unsafe { BOOTSTRAP_MM_INFO }); 407 kdebug!("phys[0]=virt[0x{:x}]", unsafe { 408 MMArch::phys_2_virt(PhysAddr::new(0)).unwrap().data() 409 }); 410 411 // 初始化内存管理器 412 unsafe { allocator_init() }; 413 // enable mmio 414 mmio_init(); 415 } 416 417 unsafe fn allocator_init() { 418 let virt_offset = BOOTSTRAP_MM_INFO.unwrap().start_brk; 419 let phy_offset = 420 unsafe { MMArch::virt_2_phys(VirtAddr::new(page_align_up(virt_offset))) }.unwrap(); 421 422 let mut bump_allocator = BumpAllocator::<X86_64MMArch>::new(phy_offset.data()); 423 kdebug!( 424 "BumpAllocator created, offset={:?}", 425 bump_allocator.offset() 426 ); 427 428 // 暂存初始在head.S中指定的页表的地址，后面再考虑是否需要把它加到buddy的可用空间里面！ 429 // 现在不加的原因是，我担心会有安全漏洞问题：这些初始的页表，位于内核的数据段。如果归还到buddy， 430 // 可能会产生一定的安全风险（有的代码可能根据虚拟地址来进行安全校验） 431 let _old_page_table = MMArch::table(PageTableKind::Kernel); 432 433 let new_page_table: PhysAddr; 434 // 使用bump分配器，把所有的内存页都映射到页表 435 { 436 // 用bump allocator创建新的页表 437 let mut mapper: crate::mm::page::PageMapper<MMArch, &mut BumpAllocator<MMArch>> = 438 crate::mm::page::PageMapper::<MMArch, _>::create( 439 PageTableKind::Kernel, 440 &mut bump_allocator, 441 ) 442 .expect("Failed to create page mapper"); 443 new_page_table = mapper.table().phys(); 444 kdebug!("PageMapper created"); 445 446 // 取消最开始时候，在head.S中指定的映射(暂时不刷新TLB) 447 { 448 let table = mapper.table(); 449 let empty_entry = PageEntry::<MMArch>::new(0); 450 for i in 0..MMArch::PAGE_ENTRY_NUM { 451 table 452 .set_entry(i, empty_entry) 453 .expect("Failed to empty page table entry"); 454 } 455 } 456 kdebug!("Successfully emptied page table"); 457 458 let total_num = mem_block_manager().total_initial_memory_regions(); 459 for i in 0..total_num { 460 let area = mem_block_manager().get_initial_memory_region(i).unwrap(); 461 // kdebug!("area: base={:?}, size={:#x}, end={:?}", area.base, area.size, area.base + area.size); 462 for i in 0..((area.size + MMArch::PAGE_SIZE - 1) / MMArch::PAGE_SIZE) { 463 let paddr = area.base.add(i * MMArch::PAGE_SIZE); 464 let vaddr = unsafe { MMArch::phys_2_virt(paddr) }.unwrap(); 465 let flags = kernel_page_flags::<MMArch>(vaddr); 466 467 let flusher = mapper 468 .map_phys(vaddr, paddr, flags) 469 .expect("Failed to map frame"); 470 // 暂时不刷新TLB 471 flusher.ignore(); 472 } 473 } 474 475 // 添加低地址的映射（在smp完成初始化之前，需要使用低地址的映射.初始化之后需要取消这一段映射） 476 LowAddressRemapping::remap_at_low_address(&mut mapper); 477 } 478 479 unsafe { 480 INITIAL_CR3_VALUE = new_page_table; 481 } 482 kdebug!( 483 "After mapping all physical memory, DragonOS used: {} KB", 484 bump_allocator.offset() / 1024 485 ); 486 487 // 初始化buddy_allocator 488 let buddy_allocator = unsafe { BuddyAllocator::<X86_64MMArch>::new(bump_allocator).unwrap() }; 489 // 设置全局的页帧分配器 490 unsafe { set_inner_allocator(buddy_allocator) }; 491 kinfo!("Successfully initialized buddy allocator"); 492 // 关闭显示输出 493 scm_disable_put_to_window(); 494 495 // make the new page table current 496 { 497 let mut binding = INNER_ALLOCATOR.lock(); 498 let mut allocator_guard = binding.as_mut().unwrap(); 499 kdebug!("To enable new page table."); 500 compiler_fence(Ordering::SeqCst); 501 let mapper = crate::mm::page::PageMapper::<MMArch, _>::new( 502 PageTableKind::Kernel, 503 new_page_table, 504 &mut allocator_guard, 505 ); 506 compiler_fence(Ordering::SeqCst); 507 mapper.make_current(); 508 compiler_fence(Ordering::SeqCst); 509 kdebug!("New page table enabled"); 510 } 511 kdebug!("Successfully enabled new page table"); 512 } 513 514 #[no_mangle] 515 pub extern "C" fn rs_test_buddy() { 516 test_buddy(); 517 } 518 pub fn test_buddy() { 519 // 申请内存然后写入数据然后free掉 520 // 总共申请200MB内存 521 const TOTAL_SIZE: usize = 200 * 1024 * 1024; 522 523 for i in 0..10 { 524 kdebug!("Test buddy, round: {i}"); 525 // 存放申请的内存块 526 let mut v: Vec<(PhysAddr, PageFrameCount)> = Vec::with_capacity(60 * 1024); 527 // 存放已经申请的内存块的地址（用于检查重复） 528 let mut addr_set: HashSet<PhysAddr> = HashSet::new(); 529 530 let mut allocated = 0usize; 531 532 let mut free_count = 0usize; 533 534 while allocated < TOTAL_SIZE { 535 let mut random_size = 0u64; 536 unsafe { x86::random::rdrand64(&mut random_size) }; 537 // 一次最多申请4M 538 random_size = random_size % (1024 * 4096); 539 if random_size == 0 { 540 continue; 541 } 542 let random_size = 543 core::cmp::min(page_align_up(random_size as usize), TOTAL_SIZE - allocated); 544 let random_size = PageFrameCount::from_bytes(random_size.next_power_of_two()).unwrap(); 545 // 获取帧 546 let (paddr, allocated_frame_count) = 547 unsafe { LockedFrameAllocator.allocate(random_size).unwrap() }; 548 assert!(allocated_frame_count.data().is_power_of_two()); 549 assert!(paddr.data() % MMArch::PAGE_SIZE == 0); 550 unsafe { 551 assert!(MMArch::phys_2_virt(paddr) 552 .as_ref() 553 .unwrap() 554 .check_aligned(allocated_frame_count.data() * MMArch::PAGE_SIZE)); 555 } 556 allocated += allocated_frame_count.data() * MMArch::PAGE_SIZE; 557 v.push((paddr, allocated_frame_count)); 558 assert!(addr_set.insert(paddr), "duplicate address: {:?}", paddr); 559 560 // 写入数据 561 let vaddr = unsafe { MMArch::phys_2_virt(paddr).unwrap() }; 562 let slice = unsafe { 563 core::slice::from_raw_parts_mut( 564 vaddr.data() as *mut u8, 565 allocated_frame_count.data() * MMArch::PAGE_SIZE, 566 ) 567 }; 568 for i in 0..slice.len() { 569 slice[i] = ((i + unsafe { rdtsc() } as usize) % 256) as u8; 570 } 571 572 // 随机释放一个内存块 573 if v.len() > 0 { 574 let mut random_index = 0u64; 575 unsafe { x86::random::rdrand64(&mut random_index) }; 576 // 70%概率释放 577 if random_index % 10 > 7 { 578 continue; 579 } 580 random_index = random_index % v.len() as u64; 581 let random_index = random_index as usize; 582 let (paddr, allocated_frame_count) = v.remove(random_index); 583 assert!(addr_set.remove(&paddr)); 584 unsafe { LockedFrameAllocator.free(paddr, allocated_frame_count) }; 585 free_count += allocated_frame_count.data() * MMArch::PAGE_SIZE; 586 } 587 } 588 589 kdebug!( 590 "Allocated {} MB memory, release: {} MB, no release: {} bytes", 591 allocated / 1024 / 1024, 592 free_count / 1024 / 1024, 593 (allocated - free_count) 594 ); 595 596 kdebug!("Now, to release buddy memory"); 597 // 释放所有的内存 598 for (paddr, allocated_frame_count) in v { 599 unsafe { LockedFrameAllocator.free(paddr, allocated_frame_count) }; 600 assert!(addr_set.remove(&paddr)); 601 free_count += allocated_frame_count.data() * MMArch::PAGE_SIZE; 602 } 603 604 kdebug!("release done!, allocated: {allocated}, free_count: {free_count}"); 605 } 606 } 607 608 /// 全局的页帧分配器 609 #[derive(Debug, Clone, Copy, Hash)] 610 pub struct LockedFrameAllocator; 611 612 impl FrameAllocator for LockedFrameAllocator { 613 unsafe fn allocate(&mut self, count: PageFrameCount) -> Option<(PhysAddr, PageFrameCount)> { 614 if let Some(ref mut allocator) = *INNER_ALLOCATOR.lock_irqsave() { 615 return allocator.allocate(count); 616 } else { 617 return None; 618 } 619 } 620 621 unsafe fn free(&mut self, address: crate::mm::PhysAddr, count: PageFrameCount) { 622 assert!(count.data().is_power_of_two()); 623 if let Some(ref mut allocator) = *INNER_ALLOCATOR.lock_irqsave() { 624 return allocator.free(address, count); 625 } 626 } 627 628 unsafe fn usage(&self) -> PageFrameUsage { 629 if let Some(ref mut allocator) = *INNER_ALLOCATOR.lock_irqsave() { 630 return allocator.usage(); 631 } else { 632 panic!("usage error"); 633 } 634 } 635 } 636 637 /// 获取内核地址默认的页面标志 638 pub unsafe fn kernel_page_flags<A: MemoryManagementArch>(virt: VirtAddr) -> PageFlags<A> { 639 let info: X86_64MMBootstrapInfo = BOOTSTRAP_MM_INFO.clone().unwrap(); 640 641 if virt.data() >= info.kernel_code_start && virt.data() < info.kernel_code_end { 642 // Remap kernel code execute 643 return PageFlags::new().set_execute(true).set_write(true); 644 } else if virt.data() >= info.kernel_data_end && virt.data() < info.kernel_rodata_end { 645 // Remap kernel rodata read only 646 return PageFlags::new().set_execute(true); 647 } else { 648 return PageFlags::new().set_write(true).set_execute(true); 649 } 650 } 651 652 unsafe fn set_inner_allocator(allocator: BuddyAllocator<MMArch>) { 653 static FLAG: AtomicBool = AtomicBool::new(false); 654 if FLAG 655 .compare_exchange(false, true, Ordering::SeqCst, Ordering::SeqCst) 656 .is_err() 657 { 658 panic!("Cannot set inner allocator twice!"); 659 } 660 *INNER_ALLOCATOR.lock() = Some(allocator); 661 } 662 663 /// 低地址重映射的管理器 664 /// 665 /// 低地址重映射的管理器，在smp初始化完成之前，需要使用低地址的映射，因此需要在smp初始化完成之后，取消这一段映射 666 pub struct LowAddressRemapping; 667 668 impl LowAddressRemapping { 669 // 映射32M 670 const REMAP_SIZE: usize = 32 * 1024 * 1024; 671 672 pub unsafe fn remap_at_low_address( 673 mapper: &mut crate::mm::page::PageMapper<MMArch, &mut BumpAllocator<MMArch>>, 674 ) { 675 for i in 0..(Self::REMAP_SIZE / MMArch::PAGE_SIZE) { 676 let paddr = PhysAddr::new(i * MMArch::PAGE_SIZE); 677 let vaddr = VirtAddr::new(i * MMArch::PAGE_SIZE); 678 let flags = kernel_page_flags::<MMArch>(vaddr); 679 680 let flusher = mapper 681 .map_phys(vaddr, paddr, flags) 682 .expect("Failed to map frame"); 683 // 暂时不刷新TLB 684 flusher.ignore(); 685 } 686 } 687 688 /// 取消低地址的映射 689 pub unsafe fn unmap_at_low_address(flush: bool) { 690 let mut mapper = KernelMapper::lock(); 691 assert!(mapper.as_mut().is_some()); 692 for i in 0..(Self::REMAP_SIZE / MMArch::PAGE_SIZE) { 693 let vaddr = VirtAddr::new(i * MMArch::PAGE_SIZE); 694 let (_, _, flusher) = mapper 695 .as_mut() 696 .unwrap() 697 .unmap_phys(vaddr, true) 698 .expect("Failed to unmap frame"); 699 if flush == false { 700 flusher.ignore(); 701 } 702 } 703 } 704 } 705 #[no_mangle] 706 pub extern "C" fn rs_mm_init() { 707 mm_init(); 708 } 709