Add main PCI driver file and device enumeration
In this commit, the PCI driver can finally enumerate the devices in the system. Some other things are still not pushed.
This commit is contained in:
parent
3a778fee44
commit
6342b433b4
GPG Key ID:
1358818BAA38B104
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@ -0,0 +1,64 @@
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PCI_CONFIG_ADDRESS_PORT equ 0x0cf8
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PCI_CONFIG_DATA_PORT equ 0x0cfc
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PCI_DEVICE_COUNT_OFFSET equ 0xffe
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PCI_DEVICE_AREA_OFFSET equ 0x1000
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; [FURTHEST FROM BP]
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; 0. Ptr32 Pointer to 65536B slot for PCI driver
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; [NEAREST TO BP]
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initialize_pci_driver:
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push dword esi
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sub esp, 64
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mov esi, esp
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mov [esi + (64 - 4)], eax
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mov [esi + (64 - 8)], ebx
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mov [esi + (64 - 12)], ecx
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mov [esi + (64 - 16)], edx
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mov [esi + (64 - 20)], edi
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.body:
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mov ebx, [ebp - 4]
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push ebp
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mov ebp, esp
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push ebx
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push dword 0 ; No Maximum Device Limit
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call pci_enumerate
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mov esp, ebp
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pop ebp
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mov ebx, [ebp - 4]
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add ebx, PCI_DEVICE_COUNT_OFFSET
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push ebp
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mov ebp, esp
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push ebx
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push dword 2
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push dword 0
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push dword 0
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call write_hexadecimal_string
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mov esp, ebp
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pop ebp
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; todo(wip): Remove this once the PCI Driver
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; is debugged completely.
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cli
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hlt
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.epilog:
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mov eax, [esi + (64 - 4)]
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mov ebx, [esi + (64 - 8)]
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mov ecx, [esi + (64 - 12)]
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mov edx, [esi + (64 - 16)]
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mov edi, [esi + (64 - 20)]
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add esp, 64
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pop dword esi
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ret
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.storage:
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dd 0
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%include "drivers/pci/enumerate.asm"
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@ -0,0 +1,250 @@
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; Arguments:
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; ah Bus Number (0 .. 255)
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; al Device Number (0 .. 31)
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;
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; Returns:
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; - true/false (eax)
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pci_device_exists:
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push dword esi
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sub esp, 8
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mov esi, esp
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mov [esi], edx
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mov [esi + 4], eax
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.make_address:
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xor eax, eax
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; Enable Bit
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or al, 1
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; Make space for 8 Reserved Bits and 8 Bytes of bus number.
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shl eax, 15
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; Bus Number
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mov al, [esi + 5]
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; Device Number
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shl eax, 5 ; Make space for device number
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mov dl, [esi + 4]
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and dl, 0x1f
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or al, dl
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shl eax, 11
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.io_task:
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mov dx, PCI_CONFIG_ADDRESS_PORT
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out dx, eax
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mov dx, PCI_CONFIG_DATA_PORT
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in eax, dx
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cmp ax, 0xffff
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jne .device_found
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.not_a_device:
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mov edx, [esi]
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add esp, 8
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pop dword esi
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xor eax, eax
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ret
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.device_found:
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mov edx, [esi]
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add esp, 8
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pop dword esi
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mov eax, 1
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ret
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; Arguments:
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; [FURTHEST FROM EBP]
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; 3. U32 PCI Device Class & Subclass
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; (Higher byte: Class, lower byte: Subclass)
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; 2. U32 PCI Device Address
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; 1. Ptr32 Pointer to PCI driver area of 65536 bytes
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; [NEAREST TO EBP]
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pci_append_device:
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push dword esi
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sub esp, 64
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mov esi, esp
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mov [esi + (64 - 4)], eax
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mov [esi + (64 - 8)], ebx
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mov [esi + (64 - 12)], ecx
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mov [esi + (64 - 20)], edi
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.get_device_count:
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mov ebx, [ebp - 4]
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xor ecx, ecx
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mov cx, [ebx + PCI_DEVICE_COUNT_OFFSET]
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mov [esi + 4], cx
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.calculate_device_offset:
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; Every device slot has 16 bytes, multiply index with 16
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shl cx, 4
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; Point into driver device area (add device area start on top)
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add ecx, ebx
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add ecx, PCI_DEVICE_COUNT_OFFSET
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mov ebx, ecx
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.set_device:
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mov ecx, [ebp - 8]
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mov [ebx], ecx
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mov ecx, [ebp - 12]
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mov [ebx + 4], ecx
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increment_device_count:
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.epilog:
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mov eax, [esi + (64 - 4)]
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mov ebx, [esi + (64 - 8)]
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mov ecx, [esi + (64 - 12)]
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mov edi, [esi + (64 - 20)]
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add esp, 64
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pop dword esi
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ret
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; Arguments:
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; [FURTHER FROM EBP]
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; 2. U32 Bus Number (0 .. 255)
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; 1. Ptr32 Pointer to PCI driver area of 65536 bytes
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; [NEAREST TO EBP]
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;
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; Returns:
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; - Number of devics on the bus (eax)
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pci_enumerate_bus:
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push dword esi
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sub esp, 64
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mov esi, esp
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mov [esi + (64 - 8)], ebx
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mov [esi + (64 - 12)], ecx
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mov [esi + (64 - 20)], edi
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; [esi]: Device-in-bus Index
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; [esi + 4]: Number of existing devices
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; [esi + 8]: Bus number
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mov [esi], dword 0
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mov [esi + 4], dword 0
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mov eax, [ebp - 8]
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mov [esi + 8], eax
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.initialize_device_loop:
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.device_loop:
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cmp [esi], dword 32
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jae .epilog
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.test_whether_device_exists:
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push ebp
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mov ebp, esp
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mov ah, [esi + 8] ; Bus Number
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mov al, [esi] ; Device Number
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call pci_device_exists
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mov esp, ebp
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pop ebp
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cmp ax, 0
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je .no_device
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.call_append_device:
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push ebp
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mov ebp, esp
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push dword [esi + 8]
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push dword 0xcafebabe
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push dword 0xdeadbeef
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call pci_append_device
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mov esp, ebp
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pop ebp
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mov eax, [esi + 4]
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inc eax
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mov [esi + 4], eax
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.no_device:
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mov ecx, [esi]
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inc ecx
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mov [esi], ecx
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jmp .device_loop
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.epilog:
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mov ebx, [esi + (64 - 8)]
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mov ecx, [esi + (64 - 12)]
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mov edi, [esi + (64 - 20)]
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mov eax, [esi + 4]
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add esp, 64
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pop dword esi
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ret
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; Arguments:
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; [FURTHEST FROM EBP]
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; 2. U32 Maximum number of devices to enumerate
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; (0 to eliminate limit)
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; 1. Ptr32 Pointer to PCI driver area of 65536 bytes
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; [NEAREST TO EBP]
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pci_enumerate:
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push dword esi
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sub esp, 64
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mov esi, esp
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mov [esi + (64 - 4)], eax
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mov [esi + (64 - 8)], ebx
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mov [esi + (64 - 12)], ecx
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mov [esi + (64 - 16)], edx
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mov [esi + (64 - 20)], edi
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; [esi]: Number of devices found
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; ecx: Bus Index
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mov edx, [ebp - 4]
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mov [esi + 4], edx
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.bus_loop:
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xor ecx, ecx
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mov [esi], dword 0
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.bus_loop_body:
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; Test whether the device count is unlimited,
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; ignore the device count check if it is.
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cmp [ebp - 8], dword 0
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je .call_bus_enumerator
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mov edx, [esi]
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cmp edx, [ebp - 8]
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jae .epilog
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.call_bus_enumerator:
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push ebp
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mov ebp, esp
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push dword [esi + 4]
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push ecx
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call pci_enumerate_bus
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mov esp, ebp
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pop ebp
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; Add the number of devices found on the bus
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; to the number of devices found in total.
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add [esi], eax
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mov ebx, [esi + 4]
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add [ebx + PCI_DEVICE_COUNT_OFFSET], ax
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; Go to the next bus (if there is one)
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inc ecx
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cmp ecx, 256
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jb .bus_loop_body
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.epilog:
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mov ebx, [esi + (64 - 8)]
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mov ecx, [esi + (64 - 12)]
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mov edx, [esi + (64 - 16)]
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mov edi, [esi + (64 - 20)]
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mov eax, [esi]
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add esp, 64
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pop dword esi
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ret
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