{"id":198,"date":"2010-04-18T00:28:13","date_gmt":"2010-04-18T09:28:13","guid":{"rendered":"\/blog\/?p=198"},"modified":"2023-09-21T09:39:11","modified_gmt":"2023-09-21T00:39:11","slug":"ddk-iostartpacket-keacquirespinlock-%ed%95%a8%ec%88%98-%ec%82%ac%ec%9a%a9%eb%b2%95","status":"publish","type":"post","link":"https:\/\/hasu0707.duckdns.org\/blog\/?p=198","title":{"rendered":"[DDK] IoStartPacket(), KeAcquireSpinLock() \ud568\uc218 \uc0ac\uc6a9\ubc95"},"content":{"rendered":"\n
\uc55e\uc11c \ub9d0\ud55c \ub3d9\uae30\ud654 \ubb38\uc81c \uc640 StartPacket() \ud568\uc218 \ucc98\ub9ac \ubc29\ubc95\uc744 \uc54c\uc544\ubcf4\uc790,

\uc77c\ub2e8 \n\ud568\uc218 \uc774\ub984\uc744 \ubcf4\uba74 \ub514\ubc14\uc774\uc2a4 \ud568\uc218\ub4e4\uc774 \ubb34\uc5c7\uc744 \ud558\ub294\uc9c0 \uc54c \uc218 \uc788\ub2e4.

\uac04\ub2e8\ud558\uac8c \uc798\ub77c\uc11c \ubcf4\uba74, Io \ub85c \uc2dc\uc791\ud558\ub294\uac83\uc740 I\/O Manager\uac00 \n\uad00\ub9ac\ud558\ub294 \ud568\uc218\uc774\ub2e4.

\uadf8\ub9ac\uace0 Ke \ub294 Kernel Execute \uc774\ub2e4. \uc774\ub807\uac8c \ubcf4\uba74 \ud568\uc218 \uc774\ub984\uc740 \uc5b4\uc808 \uadf8\ub300\ub85c \n\ud574\uc11d\ud558\uba74,

\uc815\ud655\ud55c \ub2f5\uc744 \uc5bb\uc744 \uc218 \uc788\ub2e4.

\ub3d9\uae30\ud654 \ubb38\uc81c\uac00 \ub514\ubc14\uc774\uc2a4 \ucee4\ub110 \ub2e8\uc5d0\uc11c\ub294 \ub354\uc6b1 \uc2ec\uac01\ud558\ub2e4. \uc5b4\uae38 \uc2dc\uc5d0\ub294 BSOD\ub97c \ubcfc \n\uac83\uc774\ub2e4.

\uba40\ud2f0 \ud504\ub85c\uc138\uc11c \uc2dc\uc2a4\ud15c\uc758 \uacbd\uc6b0\uc5d0 DISPATCH_LEVEL\uc758 IRQL\uc5d0\uc11c \uad6c\ub3d9\ub418\ub294 StartIo \ub8e8\ud2f4\uc774

2\uac1c\uc758 \n\ud504\ub85c\uc138\uc11c\uc5d0\uc11c \ub3d9\uc2dc\uc5d0 \uc2e4\ud589\ub418\uac8c\ub418\uba74 \ub300\ubd80\ubd84\uc758 \ud558\ub4dc\uc6e8\uc5b4 \ub514\ubc14\uc774\uc2a4\ub294 \uc77c\ub828\uc758

\ud3ec\ud2b8\/\ub808\uc9c0\uc2a4\ud130 \uc785\ucd9c\ub825 \uc791\uc5c5\uc2dc \uc7ac\uc9c4\uc785\uc774 \n\ubd88\uac00\ub2a5\ud574\uc9c4\ub2e4.

 \uc544\ub2c8\uba74, 2\uac1c\uc758 StartIo \ub8e8\ud2f4( Arbitrary Thread\uc5d0\uc11c \ub3d9\uc2dc \uc2e4\ud589 \uc2dc\uac00 \ub420 \uc218 \uc788\uaca0\ub2e4. )\uc774 \ub3d9\uc2dc\uc5d0 \n

\uac19\uc740 \uc790\uc6d0\uc758 Context\ub97c \ubcc0\uacbd\ud560 \uc218 \uc788\uac8c \ub41c\ub2e4.

 \uc774\uc81c IoStartPacket() \uc758 \uc0ac\uc6a9\ubc95\uc744 \ubcf4\uc790.
\n


IoStartPacket<\/h1>\n

The IoStartPacket<\/b> routine calls the driver's StartIo<\/i><\/a> routine with the given IRP or inserts the IRP \ninto the device queue associated with the given device object if the device is \nalready busy.<\/p>\n

VOID <\/b>
  IoStartPacket(<\/b>
    IN \nPDEVICE_OBJECT<\/b>  DeviceObject<\/a><\/i>,<\/b>
    IN PIRP<\/b>  \nIrp<\/a><\/i>,<\/b>
    IN PULONG<\/b>  Key<\/a><\/i>  \nOPTIONAL,<\/b>
    IN PDRIVER_CANCEL<\/b>  CancelFunction<\/a><\/i>  \nOPTIONAL<\/b>
    );<\/b>
<\/p>\n

Parameters<\/h4>
DeviceObject<\/i> \n<\/dt>
Pointer to the target device object for the IRP. \n<\/dd>
Irp<\/i> \n<\/dt>
Pointer to the IRP to be processed. \n<\/dd>
Key<\/i> \n<\/dt>
Pointer to a value that determines where to insert the packet into the \ndevice queue. If this is zero, the packet is inserted at the tail of the device \nqueue. \n<\/dd>
CancelFunction<\/i> \n<\/dt>
Specifies the entry point for a driver-supplied Cancel routine. <\/dd><\/dl>\n

Return Value<\/h4>\n

None

\uadf8\ub807\ub2e4. \uadf8\ub9ac\uace0 \ub3d9\uae30\ud654 \ubb38\uc81c\ub97c \ud574\uacb0\ud558\uae30 \uc704\ud574\uc11c\ub294 Semaphore\uc640 \uac19\uc740 \uc791\uc5c5\uc744 \ud574\uc918\uc57c\ud55c\ub2e4.

\uadf8\ub54c \n\uc0ac\uc6a9\ud558\ub294 \ud568\uc218\uac00 KeAcquireSpinLock() \ud568\uc218\uc774\ub2e4.

<\/p>\n

KeAcquireSpinLock<\/h1>\n

The KeAcquireSpinLock<\/b> routine acquires a spin lock so the caller can \nsynchronize access to shared data in a multiprocessor-safe way by raising \nIRQL.<\/p>\n

VOID <\/b>
  KeAcquireSpinLock(<\/b>
    IN \nPKSPIN_LOCK<\/b>  SpinLock<\/a><\/i>,<\/b>
    OUT PKIRQL<\/b>  \nOldIrql<\/a><\/i>
    );<\/b>
<\/p>\n

Parameters<\/h4>
SpinLock<\/i> \n<\/dt>
Pointer to an initialized spin lock for which the caller provides the \nstorage. \n<\/dd>
OldIrql<\/i> \n<\/dt>
Pointer to a variable that is set to the current IRQL when this call occurs. \n<\/dd><\/dl>\n

Return Value<\/h4>\n

None

\uadf8\ub9ac\uace0 DISPATCH_LEVEL\uc5d0\uc11c \ub3cc\uace0\uc788\ub294 \uac83\uc774 \ud655\uc2e4\ud55c \ub8e8\ud2f4( StartIo \uac19\uc740 \ub8e8\ud2f4 )\uc774 \uc2e4\ud589\ub420 \n\uacbd\uc6b0\uc5d0\ub294

\ub2e4\ub978 \ud568\uc218\ub97c \uc2e4\ud589\ud560 \uc218 \uc788\ub2e4.

<\/p>\n

KeAcquireSpinLockAtDpcLevel<\/h1>\n

The KeAcquireSpinLockAtDpcLevel<\/b> routine acquires a spin lock when the \ncaller is already running at IRQL = DISPATCH_LEVEL.<\/p>\n

VOID <\/b>
  KeAcquireSpinLockAtDpcLevel(<\/b>
    IN \nPKSPIN_LOCK<\/b>  SpinLock<\/a><\/i>
    );<\/b>
<\/p>\n

Parameters<\/h4>
SpinLock<\/i> \n<\/dt>
Pointer to an initialized spin lock for which the caller must provide the \nstorage. <\/dd><\/dl>\n

Return Value<\/h4>\n

None

\uc774 \ud568\uc218\ub97c \uc2e4\ud589\ud558\uac8c \ub418\uba74, \ub9ac\uc18c\uc2a4\uc758 \ub0ad\ube44\uac00 \uc904\uc5b4\ub4e4\uac8c \ub41c\ub2e4.

\uadf8\ub9ac\uace0 \ud568\uc218\uc758 \uc124\uba85\uc744 \uc8fc\uc758\uae4a\uac8c \ubcfc \ud544\uc694\uac00 \n\uc788\ub2e4.
<\/p>\n

Comments<\/h4>\n

Drivers call KeAcquireSpinLockAtDpcLevel<\/b> instead of KeAcquireSpinLock<\/b><\/a> for better driver performance if and \nonly if they are already running at IRQL = DISPATCH_LEVEL.<\/p>\n

If a driver is running at IRQL <= APC_LEVEL, it should call \nKeAcquireSpinLock<\/b> to have IRQL raised by that routine. \nKeAcquireSpinLockAtDpcLevel<\/b> assumes the caller is already running at IRQL \n= DISPATCH_LEVEL, so no raise is necessary.<\/p>\n

The caller should release the spin lock with KeReleaseSpinLockFromDpcLevel<\/b><\/a> as quickly as \npossible.<\/p>\n

For more information about spin locks, see Spin Locks<\/font><\/u><\/mshelp:link>.

\uc5ec\uae30\uc11c \uc774 \uad6c\ubb38\uc744 \n\ubcf4\uc790.

for better driver performance if and only \nif they are already running at IRQL = DISPATCH_LEVEL<\/strong><\/font>.

\ud655\uc2e4\ud788 \n\uc774\ud574\uac00 \uac00\ub294 \ubd80\ubd84\uc774\ub2e4. \uadf8\ub9ac\uace0 \ub098\uba38\uc9c0 \ub0b4\uc6a9\uc744 \ubcf4\uba74 IRQL\uc774 APC\ub808\ubca8 \ubcf4\ub2e4 \uc791\uc744 \uacbd\uc6b0\uc5d0\ub294

KeAcquireSpinLock()\uc744 \n\uc4f0\ub77c\uace0 \uad8c\uc7a5\ud558\uace0 \uc788\ub2e4. KeAcquireSpinLockAtDpcLevel() \uac19\uc740 \uacbd\uc6b0\uc5d0\ub294

DISPATCH_LEVEL\uc5d0\uc11c \uc0ac\uc6a9\ub418\uace0 \n\uc788\ub2e4\uace0 \uac00\uc815\ud558\uace0 \uc788\ub2e4\uace0 \ud55c\ub2e4.

\uc0ac\uc6a9\ubc95\uc740 \ub3d9\uc77c\ud558\ub2e4. \uc7a0\uad88\uc8fc\uace0 \ud480\uc5b4\uc8fc\uace0, \ub2e4\uc74c\uc5d0\ub294 \ubcc0\ud654\ub41c \ub514\ubc14\uc774\uc2a4 \ub8e8\ud2f4\uc744 \ud655\uc778\ud574\ubcf4\uc790.<\/p>\n

 <\/p>\n

\ucd9c\ucc98 : http:\/\/ssmhz.tistory.com\n<\/a><\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

\uc55e\uc11c \ub9d0\ud55c \ub3d9\uae30\ud654 \ubb38\uc81c \uc640 StartPacket() \ud568\uc218 \ucc98\ub9ac \ubc29\ubc95\uc744 \uc54c\uc544\ubcf4\uc790, \uc77c\ub2e8 \ud568\uc218 \uc774\ub984\uc744 \ubcf4\uba74 \ub514\ubc14\uc774\uc2a4 \ud568\uc218\ub4e4\uc774 \ubb34\uc5c7\uc744 \ud558\ub294\uc9c0 \uc54c \uc218 \uc788\ub2e4. \uac04\ub2e8\ud558\uac8c \uc798\ub77c\uc11c \ubcf4\uba74, Io \ub85c \uc2dc\uc791\ud558\ub294\uac83\uc740 I\/O Manager\uac00 \uad00\ub9ac\ud558\ub294 \ud568\uc218\uc774\ub2e4. \uadf8\ub9ac\uace0 Ke \ub294 Kernel Execute \uc774\ub2e4. \uc774\ub807\uac8c \ubcf4\uba74 \ud568\uc218 \uc774\ub984\uc740 \uc5b4\uc808 \uadf8\ub300\ub85c \ud574\uc11d\ud558\uba74, \uc815\ud655\ud55c \ub2f5\uc744 \uc5bb\uc744 \uc218 \uc788\ub2e4. \ub3d9\uae30\ud654 \ubb38\uc81c\uac00 \ub514\ubc14\uc774\uc2a4 \ucee4\ub110 \ub2e8\uc5d0\uc11c\ub294 \ub354\uc6b1 […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center 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