1 use alloc::vec::Vec; 2 use core::{intrinsics::size_of, ptr}; 3 4 use core::sync::atomic::compiler_fence; 5 6 use crate::mm::phys_2_virt; 7 8 /// 文件说明: 实现了 AHCI 中的控制器 HBA 的相关行为 9 10 /// 根据 AHCI 写出 HBA 的 Command 11 pub const ATA_CMD_READ_DMA_EXT: u8 = 0x25; // 读操作，并且退出 12 pub const ATA_CMD_WRITE_DMA_EXT: u8 = 0x35; // 写操作，并且退出 13 #[allow(dead_code)] 14 pub const ATA_CMD_IDENTIFY: u8 = 0xEC; 15 #[allow(dead_code)] 16 pub const ATA_CMD_IDENTIFY_PACKET: u8 = 0xA1; 17 #[allow(dead_code)] 18 pub const ATA_CMD_PACKET: u8 = 0xA0; 19 pub const ATA_DEV_BUSY: u8 = 0x80; 20 pub const ATA_DEV_DRQ: u8 = 0x08; 21 22 pub const HBA_PORT_CMD_CR: u32 = 1 << 15; 23 pub const HBA_PORT_CMD_FR: u32 = 1 << 14; 24 pub const HBA_PORT_CMD_FRE: u32 = 1 << 4; 25 pub const HBA_PORT_CMD_ST: u32 = 1; 26 #[allow(dead_code)] 27 pub const HBA_PORT_IS_ERR: u32 = 1 << 30 | 1 << 29 | 1 << 28 | 1 << 27; 28 pub const HBA_SSTS_PRESENT: u32 = 0x3; 29 pub const HBA_SIG_ATA: u32 = 0x00000101; 30 pub const HBA_SIG_ATAPI: u32 = 0xEB140101; 31 pub const HBA_SIG_PM: u32 = 0x96690101; 32 pub const HBA_SIG_SEMB: u32 = 0xC33C0101; 33 34 /// 接入 Port 的 不同设备类型 35 #[derive(Debug)] 36 pub enum HbaPortType { 37 None, 38 Unknown(u32), 39 SATA, 40 SATAPI, 41 PM, 42 SEMB, 43 } 44 45 /// 声明了 HBA 的所有属性 46 #[repr(packed)] 47 pub struct HbaPort { 48 pub clb: u64, // 0x00, command list base address, 1K-byte aligned 49 pub fb: u64, // 0x08, FIS base address, 256-byte aligned 50 pub is: u32, // 0x10, interrupt status 51 pub ie: u32, // 0x14, interrupt enable 52 pub cmd: u32, // 0x18, command and status 53 pub _rsv0: u32, // 0x1C, Reserved 54 pub tfd: u32, // 0x20, task file data 55 pub sig: u32, // 0x24, signature 56 pub ssts: u32, // 0x28, SATA status (SCR0:SStatus) 57 pub sctl: u32, // 0x2C, SATA control (SCR2:SControl) 58 pub serr: u32, // 0x30, SATA error (SCR1:SError) 59 pub sact: u32, // 0x34, SATA active (SCR3:SActive) 60 pub ci: u32, // 0x38, command issue 61 pub sntf: u32, // 0x3C, SATA notification (SCR4:SNotification) 62 pub fbs: u32, // 0x40, FIS-based switch control 63 pub _rsv1: [u32; 11], // 0x44 ~ 0x6F, Reserved 64 pub vendor: [u32; 4], // 0x70 ~ 0x7F, vendor specific 65 } 66 67 /// 全称 HBA Memory Register，是HBA的寄存器在内存中的映射 68 #[repr(packed)] 69 pub struct HbaMem { 70 pub cap: u32, // 0x00, Host capability 71 pub ghc: u32, // 0x04, Global host control 72 pub is: u32, // 0x08, Interrupt status 73 pub pi: u32, // 0x0C, Port implemented 74 pub vs: u32, // 0x10, Version 75 pub ccc_ctl: u32, // 0x14, Command completion coalescing control 76 pub ccc_pts: u32, // 0x18, Command completion coalescing ports 77 pub em_loc: u32, // 0x1C, Enclosure management location 78 pub em_ctl: u32, // 0x20, Enclosure management control 79 pub cap2: u32, // 0x24, Host capabilities extended 80 pub bohc: u32, // 0x28, BIOS/OS handoff control and status 81 pub _rsv: [u8; 116], // 0x2C - 0x9F, Reserved 82 pub vendor: [u8; 96], // 0xA0 - 0xFF, Vendor specific registers 83 pub ports: [HbaPort; 32], // 0x100 - 0x10FF, Port control registers 84 } 85 86 /// HBA Command Table 里面的 PRDT 项 87 /// 作用: 记录了内存中读/写数据的位置，以及长度。你可以把他类比成一个指针？ 88 #[repr(packed)] 89 pub struct HbaPrdtEntry { 90 pub dba: u64, // Data base address 91 _rsv0: u32, // Reserved 92 pub dbc: u32, // Byte count, 4M max, interrupt = 1 93 } 94 95 /// HAB Command Table 96 /// 每个 Port 一个 Table，主机和设备的交互都靠这个数据结构 97 #[repr(packed)] 98 pub struct HbaCmdTable { 99 // 0x00 100 pub cfis: [u8; 64], // Command FIS 101 // 0x40 102 pub acmd: [u8; 16], // ATAPI command, 12 or 16 bytes 103 // 0x50 104 _rsv: [u8; 48], // Reserved 105 // 0x80 106 pub prdt_entry: [HbaPrdtEntry; 8], // Physical region descriptor table entries, 0 ~ 65535, 需要注意不要越界 这里设置8的原因是，目前CmdTable只预留了8个PRDT项的空间 107 } 108 109 /// HBA Command Header 110 /// 作用: 你可以把他类比成 Command Table 的指针。 111 /// 猜测: 这里多了一层 Header，而不是直接在 HbaMem 结构体指向 CmdTable，可能是为了兼容和可移植性？ 112 #[repr(packed)] 113 pub struct HbaCmdHeader { 114 // DW0 115 pub cfl: u8, 116 // Command FIS length in DWORDS: 5(len in [2, 16]), atapi: 1, write - host to device: 1, prefetchable: 1 117 pub _pm: u8, // Reset - 0x80, bist: 0x40, clear busy on ok: 0x20, port multiplier 118 pub prdtl: u16, // Physical region descriptor table length in entries 119 // DW1 120 pub _prdbc: u32, // Physical region descriptor byte count transferred 121 // DW2, 3 122 pub ctba: u64, // Command table descriptor base address 123 // DW4 - 7 124 pub _rsv1: [u32; 4], // Reserved 125 } 126 127 /// Port 的函数实现 128 impl HbaPort { 129 /// 获取设备类型 130 pub fn check_type(&mut self) -> HbaPortType { 131 if volatile_read!(self.ssts) & HBA_SSTS_PRESENT > 0 { 132 let sig = volatile_read!(self.sig); 133 match sig { 134 HBA_SIG_ATA => HbaPortType::SATA, 135 HBA_SIG_ATAPI => HbaPortType::SATAPI, 136 HBA_SIG_PM => HbaPortType::PM, 137 HBA_SIG_SEMB => HbaPortType::SEMB, 138 _ => HbaPortType::Unknown(sig), 139 } 140 } else { 141 HbaPortType::None 142 } 143 } 144 145 /// 启动该端口的命令引擎 146 pub fn start(&mut self) { 147 while volatile_read!(self.cmd) & HBA_PORT_CMD_CR > 0 { 148 core::hint::spin_loop(); 149 } 150 let val: u32 = volatile_read!(self.cmd) | HBA_PORT_CMD_FRE | HBA_PORT_CMD_ST; 151 volatile_write!(self.cmd, val); 152 } 153 154 /// 关闭该端口的命令引擎 155 pub fn stop(&mut self) { 156 #[allow(unused_unsafe)] 157 { 158 volatile_write!( 159 self.cmd, 160 (u32::MAX ^ HBA_PORT_CMD_ST) & volatile_read!(self.cmd) 161 ); 162 } 163 164 while volatile_read!(self.cmd) & (HBA_PORT_CMD_FR | HBA_PORT_CMD_CR) 165 == (HBA_PORT_CMD_FR | HBA_PORT_CMD_CR) 166 { 167 core::hint::spin_loop(); 168 } 169 170 #[allow(unused_unsafe)] 171 { 172 volatile_write!( 173 self.cmd, 174 (u32::MAX ^ HBA_PORT_CMD_FRE) & volatile_read!(self.cmd) 175 ); 176 } 177 } 178 179 /// @return: 返回一个空闲 cmd table 的 id; 如果没有，则返回 Option::None 180 pub fn find_cmdslot(&self) -> Option<u32> { 181 let slots = volatile_read!(self.sact) | volatile_read!(self.ci); 182 for i in 0..32 { 183 if slots & 1 << i == 0 { 184 return Some(i); 185 } 186 } 187 return None; 188 } 189 190 /// 初始化, 把 CmdList 等变量的地址赋值到 HbaPort 上 - 这些空间由操作系统分配且固定 191 /// 等价于原C版本的 port_rebase 函数 192 pub fn init(&mut self, clb: u64, fb: u64, ctbas: &Vec<u64>) { 193 self.stop(); // 先暂停端口 194 195 // 赋值 command list base address 196 // Command list offset: 1K*portno 197 // Command list entry size = 32 198 // Command list entry maxim count = 32 199 // Command list maxim size = 32*32 = 1K per port 200 volatile_write!(self.clb, clb); 201 202 unsafe { 203 compiler_fence(core::sync::atomic::Ordering::SeqCst); 204 ptr::write_bytes(phys_2_virt(clb as usize) as *mut u64, 0, 1024); 205 } 206 207 // 赋值 fis base address 208 // FIS offset: 32K+256*portno 209 // FIS entry size = 256 bytes per port 210 volatile_write!(self.fb, fb); 211 unsafe { 212 compiler_fence(core::sync::atomic::Ordering::SeqCst); 213 ptr::write_bytes(phys_2_virt(fb as usize) as *mut u64, 0, 256); 214 } 215 216 // 赋值 command table base address 217 // Command table offset: 40K + 8K*portno 218 // Command table size = 256*32 = 8K per port 219 let mut cmdheaders = phys_2_virt(clb as usize) as *mut u64 as *mut HbaCmdHeader; 220 for i in 0..32 as usize { 221 volatile_write!((*cmdheaders).prdtl, 0); // 一开始没有询问，prdtl = 0（预留了8个PRDT项的空间） 222 volatile_write!((*cmdheaders).ctba, ctbas[i]); 223 // 这里限制了 prdtl <= 8, 所以一共用了256bytes，如果需要修改，可以修改这里 224 compiler_fence(core::sync::atomic::Ordering::SeqCst); 225 unsafe { 226 ptr::write_bytes(phys_2_virt(ctbas[i] as usize) as *mut u64, 0, 256); 227 } 228 cmdheaders = (cmdheaders as usize + size_of::<HbaCmdHeader>()) as *mut HbaCmdHeader; 229 } 230 231 #[allow(unused_unsafe)] 232 { 233 // 启动中断 234 volatile_write!(self.ie, 0 /*TODO: Enable interrupts: 0b10111*/); 235 236 // 错误码 237 volatile_write!(self.serr, volatile_read!(self.serr)); 238 239 // Disable power management 240 volatile_write!(self.sctl, volatile_read!(self.sctl) | 7 << 8); 241 242 // Power on and spin up device 243 volatile_write!(self.cmd, volatile_read!(self.cmd) | 1 << 2 | 1 << 1); 244 } 245 self.start(); // 重新开启端口 246 } 247 } 248 249 #[repr(u8)] 250 #[allow(dead_code)] 251 pub enum FisType { 252 /// Register FIS - host to device 253 RegH2D = 0x27, 254 /// Register FIS - device to host 255 RegD2H = 0x34, 256 /// DMA activate FIS - device to host 257 DmaAct = 0x39, 258 /// DMA setup FIS - bidirectional 259 DmaSetup = 0x41, 260 /// Data FIS - bidirectional 261 Data = 0x46, 262 /// BIST activate FIS - bidirectional 263 Bist = 0x58, 264 /// PIO setup FIS - device to host 265 PioSetup = 0x5F, 266 /// Set device bits FIS - device to host 267 DevBits = 0xA1, 268 } 269 270 #[repr(packed)] 271 pub struct FisRegH2D { 272 // DWORD 0 273 pub fis_type: u8, // FIS_TYPE_REG_H2D 274 275 pub pm: u8, // Port multiplier, 1: Command, 0: Control 276 // uint8_t pmport : 4; // Port multiplier 低4位 277 // uint8_t rsv0 : 3; // Reserved 278 // uint8_t c : 1; // 1: Command, 0: Control 279 pub command: u8, // Command register 280 pub featurel: u8, // Feature register, 7:0 281 282 // DWORD 1 283 pub lba0: u8, // LBA low register, 7:0 284 pub lba1: u8, // LBA mid register, 15:8 285 pub lba2: u8, // LBA high register, 23:16 286 pub device: u8, // Device register 287 288 // DWORD 2 289 pub lba3: u8, // LBA register, 31:24 290 pub lba4: u8, // LBA register, 39:32 291 pub lba5: u8, // LBA register, 47:40 292 pub featureh: u8, // Feature register, 15:8 293 294 // DWORD 3 295 pub countl: u8, // Count register, 7:0 296 pub counth: u8, // Count register, 15:8 297 pub icc: u8, // Isochronous command completion 298 pub control: u8, // Control register 299 300 // DWORD 4 301 pub rsv1: [u8; 4], // Reserved 302 } 303 304 #[repr(packed)] 305 #[allow(dead_code)] 306 pub struct FisRegD2H { 307 // DWORD 0 308 pub fis_type: u8, // FIS_TYPE_REG_D2H 309 310 pub pm: u8, // Port multiplier, Interrupt bit: 2 311 312 pub status: u8, // Status register 313 pub error: u8, // Error register 314 315 // DWORD 1 316 pub lba0: u8, // LBA low register, 7:0 317 pub lba1: u8, // LBA mid register, 15:8 318 pub lba2: u8, // LBA high register, 23:16 319 pub device: u8, // Device register 320 321 // DWORD 2 322 pub lba3: u8, // LBA register, 31:24 323 pub lba4: u8, // LBA register, 39:32 324 pub lba5: u8, // LBA register, 47:40 325 pub rsv2: u8, // Reserved 326 327 // DWORD 3 328 pub countl: u8, // Count register, 7:0 329 pub counth: u8, // Count register, 15:8 330 pub rsv3: [u8; 2], // Reserved 331 332 // DWORD 4 333 pub rsv4: [u8; 4], // Reserved 334 } 335 336 #[repr(packed)] 337 #[allow(dead_code)] 338 pub struct FisData { 339 // DWORD 0 340 pub fis_type: u8, // FIS_TYPE_DATA 341 342 pub pm: u8, // Port multiplier 343 344 pub rsv1: [u8; 2], // Reserved 345 346 // DWORD 1 ~ N 347 pub data: [u8; 252], // Payload 348 } 349 350 #[repr(packed)] 351 #[allow(dead_code)] 352 pub struct FisPioSetup { 353 // DWORD 0 354 pub fis_type: u8, // FIS_TYPE_PIO_SETUP 355 356 pub pm: u8, // Port multiplier, direction: 4 - device to host, interrupt: 2 357 358 pub status: u8, // Status register 359 pub error: u8, // Error register 360 361 // DWORD 1 362 pub lba0: u8, // LBA low register, 7:0 363 pub lba1: u8, // LBA mid register, 15:8 364 pub lba2: u8, // LBA high register, 23:16 365 pub device: u8, // Device register 366 367 // DWORD 2 368 pub lba3: u8, // LBA register, 31:24 369 pub lba4: u8, // LBA register, 39:32 370 pub lba5: u8, // LBA register, 47:40 371 pub rsv2: u8, // Reserved 372 373 // DWORD 3 374 pub countl: u8, // Count register, 7:0 375 pub counth: u8, // Count register, 15:8 376 pub rsv3: u8, // Reserved 377 pub e_status: u8, // New value of status register 378 379 // DWORD 4 380 pub tc: u16, // Transfer count 381 pub rsv4: [u8; 2], // Reserved 382 } 383 384 #[repr(packed)] 385 #[allow(dead_code)] 386 pub struct FisDmaSetup { 387 // DWORD 0 388 pub fis_type: u8, // FIS_TYPE_DMA_SETUP 389 390 pub pm: u8, // Port multiplier, direction: 4 - device to host, interrupt: 2, auto-activate: 1 391 392 pub rsv1: [u8; 2], // Reserved 393 394 // DWORD 1&2 395 pub dma_buffer_id: u64, /* DMA Buffer Identifier. Used to Identify DMA buffer in host memory. SATA Spec says host specific and not in Spec. Trying AHCI spec might work. */ 396 397 // DWORD 3 398 pub rsv3: u32, // More reserved 399 400 // DWORD 4 401 pub dma_buffer_offset: u32, // Byte offset into buffer. First 2 bits must be 0 402 403 // DWORD 5 404 pub transfer_count: u32, // Number of bytes to transfer. Bit 0 must be 0 405 406 // DWORD 6 407 pub rsv6: u32, // Reserved 408 } 409