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Diffstat (limited to 'src/VBox/Additions/common/VBoxGuest/lib/VBoxGuestR0LibIdc.cpp')
| -rw-r--r-- | src/VBox/Additions/common/VBoxGuest/lib/VBoxGuestR0LibIdc.cpp | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/src/VBox/Additions/common/VBoxGuest/lib/VBoxGuestR0LibIdc.cpp b/src/VBox/Additions/common/VBoxGuest/lib/VBoxGuestR0LibIdc.cpp new file mode 100644 index 00000000..a6cfa673 --- /dev/null +++ b/src/VBox/Additions/common/VBoxGuest/lib/VBoxGuestR0LibIdc.cpp @@ -0,0 +1,205 @@ +/* $Id: VBoxGuestR0LibIdc.cpp $ */ +/** @file + * VBoxGuestLib - Ring-0 Support Library for VBoxGuest, IDC. + */ + +/* + * Copyright (C) 2008-2019 Oracle Corporation + * + * Permission is hereby granted, free of charge, to any person + * obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, + * copy, modify, merge, publish, distribute, sublicense, and/or sell + * copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following + * conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES + * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT + * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, + * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#include "VBoxGuestR0LibInternal.h" +#include <iprt/errcore.h> +#include <VBox/VBoxGuest.h> +/*#include <iprt/asm.h>*/ + +#ifdef VBGL_VBOXGUEST +# error "This file shouldn't be part of the VBoxGuestR0LibBase library that is linked into VBoxGuest. It's client code." +#endif + + + +/********************************************************************************************************************************* +* Global Variables * +*********************************************************************************************************************************/ +/*static PVBGLIDCHANDLE volatile g_pMainHandle = NULL;*/ + + +/** + * Opens the IDC interface of the support driver. + * + * This will perform basic version negotiations and fail if the + * minimum requirements aren't met. + * + * @returns VBox status code. + * @param pHandle The handle structure (output). + * @param uReqVersion The requested version. Pass 0 for default. + * @param uMinVersion The minimum required version. Pass 0 for default. + * @param puSessionVersion Where to store the session version. Optional. + * @param puDriverVersion Where to store the session version. Optional. + * @param puDriverRevision Where to store the SVN revision of the driver. Optional. + */ +DECLR0VBGL(int) VbglR0IdcOpen(PVBGLIDCHANDLE pHandle, uint32_t uReqVersion, uint32_t uMinVersion, + uint32_t *puSessionVersion, uint32_t *puDriverVersion, uint32_t *puDriverRevision) +{ + unsigned uDefaultMinVersion; + VBGLIOCIDCCONNECT Req; + int rc; + + /* + * Validate and set failure return values. + */ + AssertPtrReturn(pHandle, VERR_INVALID_POINTER); + pHandle->s.pvSession = NULL; + + AssertPtrNullReturn(puSessionVersion, VERR_INVALID_POINTER); + if (puSessionVersion) + *puSessionVersion = 0; + + AssertPtrNullReturn(puDriverVersion, VERR_INVALID_POINTER); + if (puDriverVersion) + *puDriverVersion = 0; + + AssertPtrNullReturn(puDriverRevision, VERR_INVALID_POINTER); + if (puDriverRevision) + *puDriverRevision = 0; + + AssertReturn(!uMinVersion || (uMinVersion & UINT32_C(0xffff0000)) == (VBGL_IOC_VERSION & UINT32_C(0xffff0000)), VERR_INVALID_PARAMETER); + AssertReturn(!uReqVersion || (uReqVersion & UINT32_C(0xffff0000)) == (VBGL_IOC_VERSION & UINT32_C(0xffff0000)), VERR_INVALID_PARAMETER); + + /* + * Handle default version input and enforce minimum requirements made + * by this library. + * + * The clients will pass defaults (0), and only in the case that some + * special API feature was just added will they set an actual version. + * So, this is the place where can easily enforce a minimum IDC version + * on bugs and similar. It corresponds a bit to what SUPR3Init is + * responsible for. + */ + uDefaultMinVersion = VBGL_IOC_VERSION & UINT32_C(0xffff0000); + if (!uMinVersion || uMinVersion < uDefaultMinVersion) + uMinVersion = uDefaultMinVersion; + if (!uReqVersion || uReqVersion < uDefaultMinVersion) + uReqVersion = uDefaultMinVersion; + + /* + * Setup the connect request packet and call the OS specific function. + */ + VBGLREQHDR_INIT(&Req.Hdr, IDC_CONNECT); + Req.u.In.u32MagicCookie = VBGL_IOCTL_IDC_CONNECT_MAGIC_COOKIE; + Req.u.In.uMinVersion = uMinVersion; + Req.u.In.uReqVersion = uReqVersion; + Req.u.In.uReserved = 0; + rc = vbglR0IdcNativeOpen(pHandle, &Req); + if (RT_SUCCESS(rc)) + rc = Req.Hdr.rc; + if (RT_SUCCESS(rc)) + { + pHandle->s.pvSession = Req.u.Out.pvSession; + if (puSessionVersion) + *puSessionVersion = Req.u.Out.uSessionVersion; + if (puDriverVersion) + *puDriverVersion = Req.u.Out.uDriverVersion; + if (puDriverRevision) + *puDriverRevision = Req.u.Out.uDriverRevision; + + /* + * We don't really trust anyone, make sure the returned + * session and version values actually makes sense. + */ + if ( RT_VALID_PTR(Req.u.Out.pvSession) + && Req.u.Out.uSessionVersion >= uMinVersion + && (Req.u.Out.uSessionVersion & UINT32_C(0xffff0000)) == (VBGL_IOC_VERSION & UINT32_C(0xffff0000))) + { + /*ASMAtomicCmpXchgPtr(&g_pMainHandle, pHandle, NULL);*/ + return rc; + } + + AssertMsgFailed(("pSession=%p uSessionVersion=0x%x (r%u)\n", Req.u.Out.pvSession, Req.u.Out.uSessionVersion, Req.u.Out.uDriverRevision)); + rc = VERR_VERSION_MISMATCH; + VbglR0IdcClose(pHandle); + } + + return rc; +} + + +/** + * Closes a IDC connection established by VbglR0IdcOpen. + * + * @returns VBox status code. + * @param pHandle The IDC handle. + */ +DECLR0VBGL(int) VbglR0IdcClose(PVBGLIDCHANDLE pHandle) +{ + VBGLIOCIDCDISCONNECT Req; + int rc; + + /* + * Catch closed handles and check that the session is valid. + */ + AssertPtrReturn(pHandle, VERR_INVALID_POINTER); + if (!pHandle->s.pvSession) + return VERR_INVALID_HANDLE; + AssertPtrReturn(pHandle->s.pvSession, VERR_INVALID_HANDLE); + + /* + * Create the request and hand it to the OS specific code. + */ + VBGLREQHDR_INIT(&Req.Hdr, IDC_DISCONNECT); + Req.u.In.pvSession = pHandle->s.pvSession; + rc = vbglR0IdcNativeClose(pHandle, &Req); + if (RT_SUCCESS(rc)) + rc = Req.Hdr.rc; + if (RT_SUCCESS(rc)) + { + pHandle->s.pvSession = NULL; + /*ASMAtomicCmpXchgPtr(&g_pMainHandle, NULL, pHandle);*/ + } + return rc; +} + + +/** + * Makes an IDC call, returning the request status. + * + * @returns VBox status code. Request status if the I/O control succeeds, + * otherwise the I/O control failure status. + * @param pHandle The IDC handle. + * @param uReq The request number. + * @param pReqHdr The request header. + * @param cbReq The request size. + */ +DECLR0VBGL(int) VbglR0IdcCall(PVBGLIDCHANDLE pHandle, uintptr_t uReq, PVBGLREQHDR pReqHdr, uint32_t cbReq) +{ + int rc = VbglR0IdcCallRaw(pHandle, uReq, pReqHdr, cbReq); + if (RT_SUCCESS(rc)) + rc = pReqHdr->rc; + return rc; +} + |