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Handle USB IRQ in DPC instead of ISR #769

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Merged
Ryzee119 merged 2 commits into from
May 3, 2026
Merged

Handle USB IRQ in DPC instead of ISR #769

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ac5c14b
usb: Update libusbohci submodule to 6a0c5fe
thrimbor May 1, 2026
ed34774
usb: Use DPC for IRQ handling
thrimbor May 1, 2026
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2 changes: 1 addition & 1 deletion lib/usb/libusbohci
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Submodule libusbohci updated 1 files
+2 −5 inc/usbh_lib.h
14 changes: 13 additions & 1 deletion lib/usb/libusbohci_xbox/usbh_xbox.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3,16 +3,26 @@
#include <windows.h>
#include <xboxkrnl/xboxkrnl.h>
#include <hal/debug.h>
#include <usb.h>
#include "usbh_config_xbox.h"

extern void OHCI_IRQHandler(void);
static KINTERRUPT InterruptObject;
static KDPC DpcObject;

static BOOLEAN __stdcall ISR(PKINTERRUPT Interrupt, PVOID ServiceContext)
{
OHCI_IRQHandler();
DISABLE_OHCI_IRQ();
KeInsertQueueDpc(&DpcObject, NULL, NULL);
return TRUE;
}

static VOID NTAPI dpcRoutine(PKDPC dpc, PVOID deferredContext, PVOID arg1, PVOID arg2)
{
OHCI_IRQHandler();
ENABLE_OHCI_IRQ();
}

//Initialise the systems ohci irq and irq handler.
//The USB stacks handler function (OHCI_IRQHandler) should be called
void usbh_ohci_irq_init() {
Expand All @@ -25,11 +35,13 @@ void usbh_ohci_irq_init() {
irql,
LevelSensitive,
FALSE);
KeInitializeDpc(&DpcObject, dpcRoutine, NULL);
KeConnectInterrupt(&InterruptObject);
}

void usbh_ohci_irq_deinit() {
KeDisconnectInterrupt(&InterruptObject);
KeRemoveQueueDpc(&DpcObject);
}

//Allocate a contiguous memory pool that the ohci hardware can access.
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