61ac4fc70d
We are going to reuse PlatformDebugLibIoPort to use debug IO port from hypervisors that aren't QEMU, so reword "QEMU" to "hypervisor" in the descriptions. Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Message-Id: <20200423095358.2518197-3-anthony.perard@citrix.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/** @file
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Detection code for hypervisor debug port.
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Non-SEC instance, caches the result of detection.
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Copyright (c) 2017, Red Hat, Inc.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Base.h>
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#include "DebugLibDetect.h"
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//
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// Set to TRUE if the debug I/O port has been checked
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//
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STATIC BOOLEAN mDebugIoPortChecked = FALSE;
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//
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// Set to TRUE if the debug I/O port is enabled
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//
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STATIC BOOLEAN mDebugIoPortFound = FALSE;
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/**
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This constructor function must not do anything.
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Some modules consuming this library instance, such as the DXE Core, invoke
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the DEBUG() macro before they explicitly call
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ProcessLibraryConstructorList(). Therefore the auto-generated call from
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ProcessLibraryConstructorList() to this constructor function may be preceded
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by some calls to PlatformDebugLibIoPortFound() below. Hence
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PlatformDebugLibIoPortFound() must not rely on anything this constructor
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could set up.
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@retval RETURN_SUCCESS The constructor always returns RETURN_SUCCESS.
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**/
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RETURN_STATUS
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EFIAPI
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PlatformDebugLibIoPortConstructor (
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VOID
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)
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{
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return RETURN_SUCCESS;
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}
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/**
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At the first call, check if the debug I/O port device is present, and cache
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the result for later use. At subsequent calls, return the cached result.
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@retval TRUE if the debug I/O port device was detected.
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@retval FALSE otherwise
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**/
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BOOLEAN
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EFIAPI
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PlatformDebugLibIoPortFound (
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VOID
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)
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{
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if (!mDebugIoPortChecked) {
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mDebugIoPortFound = PlatformDebugLibIoPortDetect ();
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mDebugIoPortChecked = TRUE;
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}
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return mDebugIoPortFound;
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}
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