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BOS & Network Driver Practice

T OSSUG. JULUOSDev 星系主題. BOS & Network Driver Practice. Ben Wei (A system creator). Agenda. BOS 簡介 lspci e100_attach T ransmit & Receive Demo Issues Q emu OSE. Agenda. BOS 簡介 lspci e100_attach T ransmit & Receive Demo Issues Q emu OSE. Bos 簡介. Bos ( a.k.a Ben’s OS) 目前實作

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BOS & Network Driver Practice

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  1. TOSSUG JULUOSDev 星系主題 BOS & Network Driver Practice Ben Wei (A system creator)

  2. Agenda • BOS 簡介 • lspci • e100_attach • Transmit & Receive • Demo • Issues • Qemu OSE 2

  3. Agenda • BOS 簡介 • lspci • e100_attach • Transmit & Receive • Demo • Issues • Qemu OSE 3

  4. Bos簡介 Bos (a.k.a Ben’s OS) 目前實作 • 簡易的記憶體管理 • Timer中斷處理 • 鍵盤I/O, 佇列 • 多個執行緒的多工切換 • 精簡 blibc函式庫 • bshell簡單的命令模式 (ps, uname, free, clear…) 4

  5. Architecture lspci net Kthread (Bshell) PCI Func Network Driver CU RU Kernel Timer Mem Kernel E100 i82559ER 5

  6. Agenda • BOS 簡介 • lspci • e100_attach • Transmit & Receive • Demo • Issues • Qemu OSE 6

  7. lspci • OSDev.org“here I can find Programming Info on PCI?” • sysInLong: 讀取pci表內容 • sysOutLong: 寫入pci設備命令及資料 7

  8. MIT OSE x86.h • uint32_t inl(int port) __asm __volatile("inl %w1,%0" : "=a" (data) : "d" (port)); • voidoutl(intport, uint32_t data) __asm __volatile("outl %0,%w1" : : "a" (data), "d" (port)); 8

  9. inl/outl NASM ;uint32_t _intl(int port) _inl: movedx, [esp+4] moveax, 0         in eax, dx         ret ;void _outl(int port, uint32_t data) _outl: movedx, [esp+4]  ; port moveax, [esp+8]  ; data         out  dx, eax         ret 9

  10. PCI Config Read pciConfigRead(uint32_t bus, uint32_t slot, uint32_t func, uin32_t offset) address = (uint32_t)((bus << 16) | (slot << 11) | (func << 8) | (offset & 0xfc) | ((uint32_t)1<<31)); outl(0xCF8, address); data = (uint32_t)(intl(0xCFC); 10

  11. Ethernet Controller Info 00:18.0 Vendor:8086, devid:1029, class:0200h(Ethernet Controller),r9,t0,irq11 11

  12. Agenda • BOS 簡介 • lspci • e100_attach • Transmit & Receive • Demo • Issues • Qemu OSE 12

  13. E100_attach 啟用流程 • 啟用後，這時便用使用到 io region 1: 0xc040，長度為64位元組，參考Intel 82559 • 需要將e100 做軟體重置 • e100_reset() • Disable CSR 中斷 • DMA Rings • 傳送的緩衝區Control Block List (CBL): cbl_init() • 接收用的緩衝區Receive Frame Area (RFA): rfa_init() 13

  14. PCI enable e100 func • pci_func_enable(pci_pdata_t f) pci_conf_write(f, PCI_COMMAND_STATUS_REG,                        PCI_COMMAND_IO_ENABLE |                        PCI_COMMAND_MEM_ENABLE |                        PCI_COMMAND_MASTER_ENABLE); 執行結果 PCI function 00:18.0 (8086:1209) enabled 14

  15. E100 Reset voide100_reset() { outl(e100.addr_base[E100_IO] + CSR_PORT, PORT_SW_RESET); delay(10); } 15

  16. Tricky delay() __inline void delay(inti) { while(--i >=0) { inb(0x84); } } 16

  17. Disable e100 interrupt r = e100_exec_cmd(CSR_INT, 1); printf("e100 CSR_INT ret=%d\n", r); • e100_exec_cmd (intcsr_comp, uint8_t cmd) outb(nic.io_base + csr_comp, cmd); do { scb_command = inb(nic.io_base + CSR_COMMAND); } while (scb_command != 0 && --retry > 0); return retry > 0; 17

  18. DMA Rings • Control Block • Control Block List (CBL) • Receive Frame Area (RFA) 18

  19. Control Block (CB) Transmit Control Block (TCB) 19

  20. DMA Rings for TCBs 20

  21. Agenda • BOS 簡介 • lspci • e100_attach • Transmit & Receive • Demo • Issues • Qemu OSE 21

  22. transmit & receive • SendPacket data (transmit & receive) int e100_transmit (constchar *data, uint16_t len) • Receivepacket data int e100_receive (char *data) 22

  23. Agenda • BOS 簡介 • lspci • e100_attach • Transmit & Receive • Demo • Issues • Qemu OSE 23

  24. Demo 24

  25. Demo - recap bos$ net PCI function 00:18.0 (8086:1209) enabled mem region 0: 4096 bytes at 0xf2020000 io region 1: 64 bytes at 0xc040 cblavail = 9, wait = 1, slot = 0x420000, irq=11 rfaavail = 10, wait = 0, slot = 0x420050 25

  26. Agenda • BOS 簡介 • lspci • e100_attach • Transmit & Receive • Demo • Issues • Qemu OSE 26

  27. Issues • 原使用e100設備序號，並不生效；後來研究OSE資料後，發現必須在qemu參數中設定，之後再使用設備序號1209來啟用e100(i82559er)，如此才能正確執行在qemu環境。 • 系統在開發的過程中，偶遇到無法正常開機，這時GIT便可派上用場，來縮小問題發生的範圍。 27

  28. Agenda • BOS 簡介 • lspci • e100_attach • Transmit & Receive • Demo • Issues • Qemu OSE 28

  29. 編繹Qemu OSE版本 $ configure--disable-sdl–prefix=/usr/local/qemuose $ --target-list=i386-softmmu $ make $ sudo make install 另外在Bos v0.21中執行Qemu時，將檢查/usr/local/qemuose，若存在則直接使用。 29

  30. Qemu參數 • 參數 qemu-fda "../bos.img" -net user -net nic,model=i82559er • MIT OSE參數 (只在qemu 0.12.5-6.828中支援） -debug-e100 -pcap <file> 30

  31. 結論 • PCI 資訊的存取 • 啟用e100網路卡 • 設定並使用DMA Rings • 更好的偵錯方式來進行網卡開發 • 相關遇到問題的經驗分享 31

  32. Q & A 32

  33. JuluOSDev議程 • 有興趣一起開發Juluos的朋友們，請加入到juluosdev group at google，參與開發議程討論，位置詳見Julu.staros.mobi公告。 33

  34. Backup Slides 34

  35. Glossary of Abbreviations • CB Control Block • CBL Command Block List • CSR Control/Status Registers • CU Command Unit • RFA Receive Frame Area • RFD Receive Frame Descriptor • RU Receive Unit • SCB System Control Block • TCB Transmit Command Block 35

  36. 參考資料及延伸閱讀 • MIT OSE • MIT OSE Lab6 • MIT OSE Tools • Intel 82559 • NASM x86 Quick Reference • OSDev.org • Where can I find programming info on PCI? • Differences Between AT&T and Intel assembler formats 36

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