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service_proc:
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service_proc:
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; 1. Get parameter from the stack: [esp+4] is the first parameter,
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; 1. Get parameter from the stack: [esp+4] is the first parameter,
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;       pointer to IOCTL structure.
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;       pointer to IOCTL structure.
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        mov     edx, [esp+4]    ; edx -> IOCTL
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        mov     edx, [esp+4]    ; edx -> IOCTL
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; 2. Get request code and select a handler for the code.
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; 2. Get request code and select a handler for the code.
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        mov     eax, [IOCTL.io_code]
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        mov     eax, [edx + IOCTL.io_code]
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        test    eax, eax        ; check for SRV_GETVERSION
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        test    eax, eax        ; check for SRV_GETVERSION
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        jnz     @f
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        jnz     @f
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; 3. This is SRV_GETVERSION request, no input, 4 bytes output, API_VERSION.
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; 3. This is SRV_GETVERSION request, no input, 4 bytes output, API_VERSION.
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; 3a. Output size must be at least 4 bytes.
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; 3a. Output size must be at least 4 bytes.
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        cmp     [IOCTL.out_size], 4
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        cmp     [edx + IOCTL.out_size], 4
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        jb      .fail
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        jb      .fail
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; 3b. Write result to the output buffer.
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; 3b. Write result to the output buffer.
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        mov     eax, [IOCTL.output]
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        mov     eax, [edx + IOCTL.output]
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        mov     [eax], dword API_VERSION
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        mov     [eax], dword API_VERSION
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; 3c. Return success.
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; 3c. Return success.
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        xor     eax, eax
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        xor     eax, eax
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        ret     4
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        ret     4
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  @@:
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  @@:
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        dec     eax     ; check for SRV_HOOK
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        dec     eax     ; check for SRV_HOOK
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        jnz     .fail
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        jnz     .fail
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; 4. This is SRV_HOOK request, input defines the device to hook, no output.
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; 4. This is SRV_HOOK request, input defines the device to hook, no output.
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; 4a. The driver works only with PCI devices,
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; 4a. The driver works only with PCI devices,
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;       so input must be at least 3 bytes long.
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;       so input must be at least 3 bytes long.
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        cmp     [IOCTL.inp_size], 3
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        cmp     [edx + IOCTL.inp_size], 3
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        jb      .fail
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        jb      .fail
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; 4b. First byte of input is bus type, 1 stands for PCI.
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; 4b. First byte of input is bus type, 1 stands for PCI.
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        mov     eax, [IOCTL.input]
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        mov     eax, [edx + IOCTL.input]
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        cmp     byte [eax], 1
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        cmp     byte [eax], 1
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        jne     .fail
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        jne     .fail
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; 4c. Second and third bytes of the input define the device: bus and dev.
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; 4c. Second and third bytes of the input define the device: bus and dev.
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;       Word in bx holds both bytes.
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;       Word in bx holds both bytes.
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        mov     bx, [eax+1]
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        mov     bx, [eax+1]
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        mov     esi, device_list
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        mov     esi, device_list
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        mov     ecx, [devices]
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        mov     ecx, [devices]
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        test    ecx, ecx
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        test    ecx, ecx
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        jz      .firstdevice
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        jz      .firstdevice
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;        mov     eax, [IOCTL.input]                      ; get the pci bus and device numbers
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;        mov     eax, [edx + IOCTL.input]               ; get the pci bus and device numbers
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        mov     ax, [eax+1]                            ;
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        mov     ax, [eax+1]                            ;
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  .nextdevice:
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  .nextdevice:
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        mov     ebx, [esi]
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        mov     ebx, [esi]
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        cmp     al, byte[device.pci_bus]
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        cmp     al, byte[device.pci_bus]
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        jae     .fail
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        jae     .fail
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; 4g. Allocate memory for device descriptor and receive+transmit buffers.
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; 4g. Allocate memory for device descriptor and receive+transmit buffers.
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; 4h. Zero the structure.
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; 4h. Zero the structure.
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        allocate_and_clear ebx, device.size, .fail
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        allocate_and_clear ebx, device.size, .fail
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; 4i. Save PCI coordinates
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; 4i. Save PCI coordinates
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        mov     eax, [IOCTL.input]
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        mov     eax, [edx + IOCTL.input]
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        movzx   ecx, byte[eax+1]
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        movzx   ecx, byte[eax+1]
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        mov     [device.pci_bus], ecx
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        mov     [device.pci_bus], ecx
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        movzx   ecx, byte[eax+2]
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        movzx   ecx, byte[eax+2]
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        mov     [device.pci_dev], ecx
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        mov     [device.pci_dev], ecx
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; 4j. Fill in the direct call addresses into the struct.
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; 4j. Fill in the direct call addresses into the struct.