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        jb      .every_frame

        jb      .every_frame

; 2. Determine the actual interval in milliseconds.

; 2. Determine the actual interval in milliseconds.

        sub     ecx, 3

        sub     ecx, 3

        cmp     ecx, 5  ; maximum 32ms

        cmp     ecx, 5  ; maximum 32ms

        jbe     @f

        jbe     @f

@@:

@@:

; There are four nested loops,

; There are four nested loops,

; * Loop #4 (the innermost one) calculates the total periodic bandwidth

; * Loop #4 (the innermost one) calculates the total periodic bandwidth

;   scheduled in the given microframe of the given millisecond.

;   scheduled in the given microframe of the given millisecond.

; * Loop #3 calculates the maximum over all milliseconds

; * Loop #3 calculates the maximum over all milliseconds

;   loop #2 is responsible for the microframe within millisecond.

;   loop #2 is responsible for the microframe within millisecond.

; 3. Prepare for loops.

; 3. Prepare for loops.

; ebx = number of iterations of loop #1

; ebx = number of iterations of loop #1

; [esp] = delta of counter for loop #3, in bytes

; [esp] = delta of counter for loop #3, in bytes

; [esp+4] = delta between the first group and the target group, in bytes

; [esp+4] = delta between the first group and the target group, in bytes

        shl     ebx, cl

        shl     ebx, cl

        shl     edx, cl

        shl     edx, cl

        mov     eax, 64*sizeof.ehci_static_ep

        mov     eax, 64*sizeof.ehci_static_ep

        sub     eax, edx

        sub     eax, edx

        sub     eax, edx

        sub     eax, edx

; then the previous optimum, update the optimal bandwidth and the target.

; then the previous optimum, update the optimal bandwidth and the target.

        cmp     edi, [.bandwidth]

        cmp     edi, [.bandwidth]

        ja      @f

        ja      @f

        mov     [.bandwidth], edi

        mov     [.bandwidth], edi

        mov     [.target], edx

        mov     [.target], edx

        shl     eax, cl

        shl     eax, cl

        mov     [.targetsmask], eax

        mov     [.targetsmask], eax

@@:

@@:

; 4k. Loop #2: continue 8 times for every microframe.

; 4k. Loop #2: continue 8 times for every microframe.

        inc     ecx

        inc     ecx

; USB2 specification allows maximum 60000*80% bit times for periodic microframe

; USB2 specification allows maximum 60000*80% bit times for periodic microframe

; 8. Convert {o|u}hci_static_ep to usb_static_ep, update bandwidth and return.

; 8. Convert {o|u}hci_static_ep to usb_static_ep, update bandwidth and return.

        mov     ecx, [.targetsmask]

        mov     ecx, [.targetsmask]

        add     [edx+ehci_static_ep.Bandwidths+ecx*2], ax

        add     [edx+ehci_static_ep.Bandwidths+ecx*2], ax

        add     edx, ehci_static_ep.SoftwarePart

        add     edx, ehci_static_ep.SoftwarePart

        shl     eax, cl

        shl     eax, cl

        pop     edi ebx         ; restore used registers to be stdcall

        pop     edi ebx         ; restore used registers to be stdcall

        ret

        ret

.every_frame:

.every_frame:

; The pipe should be scheduled every frame in two or more microframes.

; The pipe should be scheduled every frame in two or more microframes.

.bandwidth1     dd      ?

.bandwidth1     dd      ?

.bandwidth0     dd      ?

.bandwidth0     dd      ?

end virtual

end virtual

; 10. Select the best variant.

; 10. Select the best variant.

; edx = S-Mask = bitmask of scheduled microframes

; edx = S-Mask = bitmask of scheduled microframes

        cmp     ecx, 1

        cmp     ecx, 1

        ja      @f

        ja      @f

        mov     dl, 0x55

        mov     dl, 0x55

        jz      @f

        jz      @f

        mov     dl, 0xFF

        mov     dl, 0xFF