753 lines
18 KiB
C
753 lines
18 KiB
C
/*++
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Copyright (c) 2000 Microsoft Corporation
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Module Name:
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usb2lib.c
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Abstract:
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interface to usb2lib, usb2 low/full speed scheduling algorithms
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Environment:
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kernel or user mode only
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Notes:
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Revision History:
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10-31-00 : created
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--*/
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#include "common.h"
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USB2LIB_DATA LibData;
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VOID
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USB2LIB_InitializeLib(
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PULONG HcContextSize,
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PULONG EndpointContextSize,
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PULONG TtContextSize,
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PUSB2LIB_DBGPRINT Usb2LibDbgPrint,
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PUSB2LIB_DBGBREAK Usb2LibDbgBreak
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)
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/*++
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Routine Description:
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Arguments:
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Return Value:
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--*/
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{
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*HcContextSize = sizeof(USB2LIB_HC_CONTEXT);
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*TtContextSize = sizeof(USB2LIB_TT_CONTEXT);
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*EndpointContextSize = sizeof(USB2LIB_ENDPOINT_CONTEXT);
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LibData.DbgPrint = Usb2LibDbgPrint;
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LibData.DbgBreak = Usb2LibDbgBreak;
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}
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VOID
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USB2LIB_InitController(
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PUSB2LIB_HC_CONTEXT HcContext
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)
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/*++
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Routine Description:
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Called at init time for an instance of the USB 2
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controller
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Arguments:
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Return Value:
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--*/
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{
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DBGPRINT(("USB2LIB_InitController %x\n", HcContext));
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HcContext->Sig = SIG_LIB_HC;
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init_hc(&HcContext->Hc);
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init_tt(&HcContext->Hc, &HcContext->DummyTt); // set up dummy TT for use by HS endpoints
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}
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VOID
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USB2LIB_InitTt(
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PUSB2LIB_HC_CONTEXT HcContext,
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PUSB2LIB_TT_CONTEXT TtContext
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)
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/*++
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Routine Description:
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Arguments:
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Return Value:
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--*/
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{
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DBGPRINT(("USB2LIB_InitTt %x %x\n", HcContext, TtContext));
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TtContext->Sig = SIG_LIB_TT;
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init_tt(&HcContext->Hc, &TtContext->Tt);
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}
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#if 1
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void Shift_to_list_end(
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int move_ep,
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PEndpoint RebalanceList[]
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)
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{
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// int i;
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PEndpoint ep = RebalanceList[move_ep];
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move_ep++;
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while (RebalanceList[move_ep])
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{
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RebalanceList[move_ep-1] = RebalanceList[move_ep];
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move_ep++;
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}
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RebalanceList[move_ep-1] = ep;
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}
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#endif
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BOOLEAN
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Promote_endpoint_periods(
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PEndpoint ep,
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PEndpoint RebalanceList[],
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PULONG RebalanceListEntries
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)
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{
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int unwind = 0, check_ep;
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unsigned result;
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if ((ep->actual_period != 1) && (ep->ep_type == interrupt) && (ep->start_microframe > 2))
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{
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DBGPRINT((">Period Promotion of allocated endpoint\n"));
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// To promote an endpoint period:
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// 0) unwind = false
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// 1) deallocate original endpoint
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// 2) change new ep period to 1
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// 3) (re)allocate new endpoint (with new period 1)
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// 4) if successful
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// 5) check endpoints in change list for need of period promotion
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// 6) deallocate endpoint, move to end of change list, change period to 1, reallocate
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// 7) if unsuccessful
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// 8) unwind = true; break
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// 9) next ep
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//10) if unwind
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//11) deallocate orginal ep
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//12) check change list for promotion endpoint(s)
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//13) if promoted ep
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//14) deallocate ep, change back to original period, allocate
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//15) next ep
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//16) return false
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//17) else return true
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//18) else return false
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/*
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// On return, change list will have promoted endpoints in order of reallocation, but it is possible
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// to have other endpoints interspersed with the promoted endpoints. The corresponding schedule of endpoints
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// must be adjusted to match the order of the promoted endpoints (since they are reinserted into the budget).
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// The promoted endpoints (except the original endpoint) are moved to the end of the change list as the
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// promotion reallocations are done to ensure that they are in the change list in the order of insertion
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// into the budget. This allows the scheduler to derive the new schedule/budget order from the order the
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// promoted endpoints appear in the change list.
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//
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// This algorithm (critically) depends on the Allocate/Deallocate "appending"/reusing an existing change list
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// as the "final" change list is composed during the period promotion processing is performed.
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*/
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Deallocate_time_for_endpoint(ep,
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RebalanceList,
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RebalanceListEntries);
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ep->saved_period = ep->period;
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ep->period = 1;
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// 3) (re)allocate new endpoint (with new period 1)
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result = Allocate_time_for_endpoint(ep,
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RebalanceList,
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RebalanceListEntries);
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if (!result) {
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ep->period = ep->saved_period;
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ep->saved_period = 0;
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ep->promoted_this_time = 0;
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return 0; // failed period promotion of original endpoint
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}
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}
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check_ep = 0;
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while (RebalanceList[check_ep])
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{
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RebalanceList[check_ep]->promoted_this_time = 0;
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check_ep++;
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}
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check_ep = 0;
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while (RebalanceList[check_ep])
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{
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if ((RebalanceList[check_ep]->actual_period != 1) &&
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(RebalanceList[check_ep]->ep_type == interrupt) &&
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(RebalanceList[check_ep]->start_microframe > 2))
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{
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// 6) deallocate endpoint, move to end of change list, change period to 1, reallocate
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DBGPRINT((">Period Promoting endpoint\n"));
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Deallocate_time_for_endpoint(
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RebalanceList[check_ep],
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RebalanceList,
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RebalanceListEntries);
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// Shift_to_list_end(check_ep, RebalanceList);
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RebalanceList[check_ep]->promoted_this_time = 1;
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RebalanceList[check_ep]->saved_period = RebalanceList[check_ep]->period;
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RebalanceList[check_ep]->period = 1;
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result = Allocate_time_for_endpoint(
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RebalanceList[check_ep],
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RebalanceList,
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RebalanceListEntries);
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if (!result)
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{
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unwind = 1;
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break;
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}
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}
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check_ep++;
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}
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if (unwind)
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{
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DBGPRINT((">Unwinding Promoted endpoints\n"));
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//11) deallocate orginal ep
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Deallocate_time_for_endpoint(
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ep,
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RebalanceList,
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RebalanceListEntries);
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ep->period = ep->saved_period;
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ep->saved_period = 0;
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//12) check change list for promotion endpoint(s)
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check_ep = 0;
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while (RebalanceList[check_ep])
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{
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//13) if promoted ep
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if (RebalanceList[check_ep]->promoted_this_time)
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{
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//14) deallocate ep, change back to original period, allocate
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DBGPRINT((">Reallocating Unpromoted endpoint\n"));
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if(RebalanceList[check_ep]->calc_bus_time != 0)
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Deallocate_time_for_endpoint(
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RebalanceList[check_ep],
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RebalanceList,
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RebalanceListEntries);
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RebalanceList[check_ep]->period = RebalanceList[check_ep]->saved_period;
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RebalanceList[check_ep]->saved_period = 0;
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// Leave the promoted flag set since order could have changed.
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// schedule must be reconciled accordingly by the HC code.
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//RebalanceList[check_ep]->promoted_this_time = 0;
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result = Allocate_time_for_endpoint(
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RebalanceList[check_ep],
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RebalanceList,
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RebalanceListEntries);
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}
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check_ep++;
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}
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return 0;
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} else {
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return 1;
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}
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}
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BOOLEAN
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USB2LIB_AllocUsb2BusTime(
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PUSB2LIB_HC_CONTEXT HcContext,
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PUSB2LIB_TT_CONTEXT TtContext,
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PUSB2LIB_ENDPOINT_CONTEXT EndpointContext,
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PUSB2LIB_BUDGET_PARAMETERS Budget,
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PVOID RebalanceContext,
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PVOID RebalanceList,
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PULONG RebalanceListEntries
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)
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/*++
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Routine Description:
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Arguments:
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Return Value:
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--*/
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{
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eptype endpointType;
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unsigned direction, speed;
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//PEndpoint changed_ep_list[];
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unsigned result;
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//unsigned changed_eps;
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PEndpoint ep;
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BOOLEAN alloced;
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ULONG ilop;
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PREBALANCE_LIST rbl;
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PTT tt;
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ep = &EndpointContext->Ep;
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EndpointContext->Sig = SIG_LIB_EP;
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EndpointContext->RebalanceContext = RebalanceContext;
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//changed_ep_list = RebalanceList;
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switch (Budget->TransferType) {
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case Budget_Iso:
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DBGPRINT((">Iso \n"));
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endpointType = isoch;
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break;
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case Budget_Interrupt:
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DBGPRINT((">Interrupt \n"));
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endpointType = interrupt;
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break;
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default:
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TEST_TRAP();
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}
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if (Budget->Direction == Budget_In) {
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DBGPRINT((">In \n"));
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direction = INDIR;
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} else {
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DBGPRINT((">Out \n"));
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direction = OUTDIR;
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}
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switch (Budget->Speed) {
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case Budget_FullSpeed:
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DBGPRINT((">FullSpeed \n"));
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speed = FSSPEED;
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tt = &TtContext->Tt;
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break;
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case Budget_HighSpeed:
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DBGPRINT((">HighSpeed \n"));
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speed = HSSPEED;
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tt = &HcContext->DummyTt; // set endpoint to dummy TT so HC can be reached
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break;
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case Budget_LowSpeed:
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DBGPRINT((">LowSpeed \n"));
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speed = LSSPEED;
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tt = &TtContext->Tt;
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break;
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default:
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DBGPRINT(("BAD SPEED\n"));
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}
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DBGPRINT((">Period %d\n", Budget->Period));
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if(Budget->Speed == Budget_HighSpeed) {
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// This value should be a power of 2, so we don't have to check
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// but limit its value to MAXFRAMES * 8
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if(Budget->Period > MAXMICROFRAMES) {
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Budget->Period = MAXMICROFRAMES;
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}
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} else {
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// We are full / low speed endpoint
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//
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// Round down the period to the nearest power of two (if it isn't already)
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//
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for(ilop = MAXFRAMES; ilop >= 1; ilop = ilop >> 1) {
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if(Budget->Period >= ilop) {
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break;
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}
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}
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Budget->Period = ilop;
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}
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DBGPRINT((">MaxPacket %d\n", Budget->MaxPacket));
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DBGPRINT((">Converted Period %d\n", Budget->Period));
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DBGPRINT((">RebalanceListEntries %d\n", *RebalanceListEntries));
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Set_endpoint(
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ep,
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endpointType,
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direction,
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speed,
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Budget->Period,
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Budget->MaxPacket,
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tt);
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// ask John Garney to do the math
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DBGPRINT((">alloc (ep) %x \n", ep));
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result = Allocate_time_for_endpoint(ep,
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RebalanceList,
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RebalanceListEntries);
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// check if successful, period != 1, interrupt, and "late" in frame,
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// then need to promote period to 1
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// DBGPRINT((">Executing Promote_endpoint_periods (ep) %x \n", ep));
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if (result)
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{
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result = Promote_endpoint_periods(ep,
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RebalanceList,
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RebalanceListEntries);
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}
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// nonzero indicates success
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if (result) {
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// set return parameters
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DBGPRINT((">Results\n"));
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DBGPRINT((">num_starts %d \n", ep->num_starts));
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DBGPRINT((">num_completes %d \n", ep->num_completes));
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DBGPRINT((">start_microframe %d \n", ep->start_microframe));
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// this is the schedule offset
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DBGPRINT((">start_frame %d \n", ep->start_frame));
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// period awarded, may be less than requested
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DBGPRINT((">actual_period %d \n", ep->actual_period));
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DBGPRINT((">start_time %d \n", ep->start_time));
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DBGPRINT((">calc_bus_time %d \n", ep->calc_bus_time));
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DBGPRINT((">promoted_this_time %d \n", ep->promoted_this_time));
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alloced = TRUE;
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} else {
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alloced = FALSE;
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}
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// fix up rebalance list
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rbl = RebalanceList;
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ilop = 0;
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while (rbl->RebalanceContext[ilop]) {
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PUSB2LIB_ENDPOINT_CONTEXT endpointContext;
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DBGPRINT((">rb[%d] %x\n", ilop, rbl->RebalanceContext[ilop]));
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endpointContext = CONTAINING_RECORD(rbl->RebalanceContext[ilop],
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struct _USB2LIB_ENDPOINT_CONTEXT,
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Ep);
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rbl->RebalanceContext[ilop] = endpointContext->RebalanceContext;
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ilop++;
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}
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DBGPRINT((">Change List Size = %d RBE = %d\n", ilop, *RebalanceListEntries));
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*RebalanceListEntries = ilop;
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return alloced;
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}
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VOID
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USB2LIB_FreeUsb2BusTime(
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PUSB2LIB_HC_CONTEXT HcContext,
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PUSB2LIB_TT_CONTEXT TtContext,
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PUSB2LIB_ENDPOINT_CONTEXT EndpointContext,
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PVOID RebalanceList,
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PULONG RebalanceListEntries
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)
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/*++
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Routine Description:
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Arguments:
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Return Value:
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--*/
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{
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unsigned result;
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PEndpoint ep;
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PREBALANCE_LIST rbl;
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ULONG i;
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// ASSERT(EndpointContext->Sig == SIG_LIB_EP);
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ep = &EndpointContext->Ep;
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DBGPRINT((">dealloc ep Context = 0x%x (ep) %x \n", EndpointContext, ep));
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DBGPRINT((">RebalanceListEntries %d \n", *RebalanceListEntries));
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Deallocate_time_for_endpoint(ep,
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RebalanceList,
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RebalanceListEntries);
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// fix up rebalance list
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rbl = RebalanceList;
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i = 0;
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while (rbl->RebalanceContext[i]) {
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PUSB2LIB_ENDPOINT_CONTEXT endpointContext;
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DBGPRINT((">rb[%d] %x\n", i, rbl->RebalanceContext[i]));
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endpointContext = CONTAINING_RECORD(rbl->RebalanceContext[i],
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struct _USB2LIB_ENDPOINT_CONTEXT,
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Ep);
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rbl->RebalanceContext[i] = endpointContext->RebalanceContext;
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i++;
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}
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DBGPRINT((">Change List Size = %d RBE = %d\n", i, *RebalanceListEntries));
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*RebalanceListEntries = i;
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}
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VOID
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ConvertBtoHFrame(UCHAR BFrame, UCHAR BUFrame, PUCHAR HFrame, PUCHAR HUFrame)
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{
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// The budgeter returns funky values that we have to convert to something
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// that the host controller understands.
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// If bus micro frame is -1, that means that the start split is scheduled
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// in the last microframe of the previous bus frame.
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// to convert to hframes, you simply change the microframe to 0 and
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// keep the bus frame (see one of the tables in the host controller spec
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// eg 4-17.
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if(BUFrame == 0xFF) {
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*HUFrame = 0;
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*HFrame = BFrame;
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}
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// if the budgeter returns a value in the range from 0-6
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// we simply add one to the bus micro frame to get the host
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// microframe
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if(BUFrame >= 0 && BUFrame <= 6) {
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*HUFrame = BUFrame + 1;
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*HFrame = BFrame;
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}
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// if the budgeter returns a value of 7 for the bframe
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// then the HUframe = 0 and the HUframe = buframe +1
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if(BUFrame == 7) {
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*HUFrame = 0;
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*HFrame = BFrame + 1;
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}
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}
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UCHAR
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USB2LIB_GetSMASK(PUSB2LIB_ENDPOINT_CONTEXT EndpointContext)
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{
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PEndpoint Ep;
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UCHAR tmp = 0;
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Ep = &EndpointContext->Ep;
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// ASSERT(EndpointContext->Sig == SIG_LIB_EP);
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if(Ep->speed == HSSPEED) {
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//DBGPRINT(("in GetSMASK StartUFrame on High Speed Endpoint = 0x%x\n", Ep->start_microframe));
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tmp |= 1 << Ep->start_microframe;
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} else {
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ULONG ilop;
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UCHAR HFrame; // H (Host) frame for endpoint
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UCHAR HUFrame; // H (Host) micro frame for endpoint
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// For Full and Low Speed Endpoints
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// the budgeter returns a bframe. Convert to HUFrame to get SMASK
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ConvertBtoHFrame((UCHAR)Ep->start_frame, (UCHAR)Ep->start_microframe, &HFrame, &HUFrame);
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for(ilop = 0; ilop < Ep->num_starts; ilop++) {
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tmp |= 1 << HUFrame++;
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}
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}
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return tmp;
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}
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//
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// I'm too brain dead to calculate this so just do table lookup
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//
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// Calculated by 1 << Start H Frame + 2. If Start H Frame + 2 > 7 wrap the bits
|
|
// to the lower part of the word
|
|
// eg. hframe 0 +2 means cmask in frames 2,3,4 ==> cmask 0x1c
|
|
// eg. hframe 5 + 2 means cmasks in frames 7, 8, 9 which means cmask 0x83
|
|
#define SIZE_OF_CMASK 8
|
|
static UCHAR CMASKS [SIZE_OF_CMASK] =
|
|
{ 0x1c, // Start HUFRAME 0
|
|
0x38, // Start HUFRAME 1
|
|
0x70, // Start HUFRAME 2
|
|
0xE0, // Start HUFRAME 3
|
|
0xC1, // Start HUFRAME 4
|
|
0x83, // Start HUFRAME 5
|
|
0x07, // Start HUFRAME 6
|
|
0x0E, // Start HUFRAME 7
|
|
};
|
|
|
|
|
|
UCHAR
|
|
USB2LIB_GetCMASK(PUSB2LIB_ENDPOINT_CONTEXT EndpointContext)
|
|
{
|
|
PEndpoint Ep;
|
|
|
|
Ep = &EndpointContext->Ep;
|
|
// ASSERT(EndpointContext->Sig == SIG_LIB_EP);
|
|
|
|
if(Ep->speed == HSSPEED) {
|
|
return 0;
|
|
} else if(Ep->ep_type == interrupt) {
|
|
UCHAR HFrame; // H (Host) frame for endpoint
|
|
UCHAR HUFrame; // H (Host) micro frame for endpoint
|
|
|
|
ConvertBtoHFrame((UCHAR)Ep->start_frame, (UCHAR)Ep->start_microframe,
|
|
&HFrame, &HUFrame);
|
|
|
|
return CMASKS[HUFrame];
|
|
} else {
|
|
// Split ISO!
|
|
UCHAR HFrame; // H (Host) frame for endpoint
|
|
UCHAR HUFrame; // H (Host) micro frame for endpoint
|
|
UCHAR tmp;
|
|
ULONG NumCompletes;
|
|
|
|
if(Ep->direction == OUTDIR) {
|
|
// Split iso out -- NO complete splits
|
|
return 0;
|
|
}
|
|
ConvertBtoHFrame((UCHAR)Ep->start_frame, (UCHAR)Ep->start_microframe,
|
|
&HFrame, &HUFrame);
|
|
|
|
HUFrame += 2;
|
|
NumCompletes = Ep->num_completes;
|
|
|
|
// ASSERT(NumCompletes > 0);
|
|
|
|
//
|
|
// Set all CMASKS bits to be set at the end of the frame
|
|
//
|
|
for(; HUFrame < 8; HUFrame++) {
|
|
tmp |= 1 << HUFrame;
|
|
NumCompletes--;
|
|
if(!NumCompletes){
|
|
break;
|
|
}
|
|
}
|
|
|
|
//
|
|
// Now set all CMASKS bits to be set at the end of the
|
|
// frame I.E. for the next frame wrap condition
|
|
//
|
|
while(NumCompletes) {
|
|
tmp |= 1 << (HUFrame - 8);
|
|
NumCompletes--;
|
|
}
|
|
|
|
//DBGPRINT(("in GetCMASK HFRAME = 0x%x HUFRAME 0x%x\n", HFrame, HUFrame));
|
|
return tmp;
|
|
}
|
|
}
|
|
|
|
UCHAR
|
|
USB2LIB_GetStartMicroFrame(PUSB2LIB_ENDPOINT_CONTEXT EndpointContext)
|
|
{
|
|
PEndpoint Ep;
|
|
UCHAR HFrame; // H (Host) frame for endpoint
|
|
UCHAR HUFrame; // H (Host) micro frame for endpoint
|
|
|
|
Ep = &EndpointContext->Ep;
|
|
// ASSERT(EndpointContext->Sig == SIG_LIB_EP);
|
|
|
|
ConvertBtoHFrame((UCHAR)Ep->start_frame, (UCHAR)Ep->start_microframe,
|
|
&HFrame, &HUFrame);
|
|
|
|
return HUFrame;
|
|
}
|
|
|
|
UCHAR
|
|
USB2LIB_GetPromotedThisTime(PUSB2LIB_ENDPOINT_CONTEXT EndpointContext)
|
|
{
|
|
PEndpoint Ep;
|
|
UCHAR Promoted = 0;
|
|
|
|
Ep = &EndpointContext->Ep;
|
|
// ASSERT(EndpointContext->Sig == SIG_LIB_EP);
|
|
|
|
Promoted = (UCHAR) Ep->promoted_this_time;
|
|
|
|
Ep->promoted_this_time = 0;
|
|
|
|
return Promoted;
|
|
}
|
|
|
|
UCHAR
|
|
USB2LIB_GetNewPeriod(PUSB2LIB_ENDPOINT_CONTEXT EndpointContext)
|
|
{
|
|
PEndpoint Ep;
|
|
|
|
Ep = &EndpointContext->Ep;
|
|
// ASSERT(EndpointContext->Sig == SIG_LIB_EP);
|
|
|
|
return (UCHAR) Ep->actual_period;
|
|
}
|
|
|
|
|
|
ULONG
|
|
USB2LIB_GetScheduleOffset(PUSB2LIB_ENDPOINT_CONTEXT EndpointContext)
|
|
{
|
|
PEndpoint Ep;
|
|
|
|
Ep = &EndpointContext->Ep;
|
|
// assert(EndpointContext->Sig == SIG_LIB_EP);
|
|
|
|
return Ep->start_frame;
|
|
}
|
|
|
|
PVOID
|
|
USB2LIB_GetEndpoint(PUSB2LIB_ENDPOINT_CONTEXT EndpointContext)
|
|
{
|
|
return &(EndpointContext->Ep);
|
|
}
|
|
|
|
|
|
|
|
ULONG
|
|
USB2LIB_GetAllocedBusTime(PUSB2LIB_ENDPOINT_CONTEXT EndpointContext)
|
|
{
|
|
PEndpoint Ep;
|
|
|
|
Ep = &EndpointContext->Ep;
|
|
// assert(EndpointContext->Sig == SIG_LIB_EP);
|
|
|
|
return Ep->calc_bus_time;
|
|
}
|
|
|
|
|
|
PVOID
|
|
USB2LIB_GetNextEndpoint(PUSB2LIB_ENDPOINT_CONTEXT EndpointContext)
|
|
{
|
|
PEndpoint Ep, nextEp;
|
|
PUSB2LIB_ENDPOINT_CONTEXT nextContext;
|
|
|
|
Ep = &EndpointContext->Ep;
|
|
nextEp = Ep->next_ep;
|
|
|
|
if (nextEp) {
|
|
|
|
nextContext = CONTAINING_RECORD(nextEp,
|
|
struct _USB2LIB_ENDPOINT_CONTEXT,
|
|
Ep);
|
|
// assert(EndpointContext->Sig == SIG_LIB_EP);
|
|
return nextContext->RebalanceContext;
|
|
} else {
|
|
return NULL;
|
|
}
|
|
}
|