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MdeModulePkg/XhciDxe: Check return value of XHC_PAGESIZE register 

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3954

Report error if reserved bits are not 0 for PageSize

Cc: Ray Ni <ray.ni@intel.com>
Cc: Hao Wu <hao.a.wu@intel.com>
Signed-off-by: Heng Luo <heng.luo@intel.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
This commit is contained in:
Luo, Heng 2022-06-20 15:08:16 +08:00 committed by mergify[bot]
parent cfe165140a
commit b97243dea3
1 changed files with 8 additions and 2 deletions
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10
MdeModulePkg/Bus/Pci/XhciDxe/Xhci.c
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@ -1,7 +1,7 @@
/** @file
The XHCI controller driver.
Copyright (c) 2011 - 2018, Intel Corporation. All rights reserved.<BR>
Copyright (c) 2011 - 2022, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
@ -1813,7 +1813,13 @@ XhcCreateUsbHc (
// This xHC supports a page size of 2^(n+12) if bit n is Set. For example,
// if bit 0 is Set, the xHC supports 4k byte page sizes.
//
PageSize = XhcReadOpReg (Xhc, XHC_PAGESIZE_OFFSET) & XHC_PAGESIZE_MASK;
PageSize = XhcReadOpReg (Xhc, XHC_PAGESIZE_OFFSET);
if ((PageSize & (~XHC_PAGESIZE_MASK)) != 0) {
DEBUG ((DEBUG_ERROR, "XhcCreateUsb3Hc: Reserved bits are not 0 for PageSize\n"));
goto ON_ERROR;
}
PageSize &= XHC_PAGESIZE_MASK;
Xhc->PageSize = 1 << (HighBitSet32 (PageSize) + 12);
ExtCapReg = (UINT16)(Xhc->HcCParams.Data.ExtCapReg);