diff options
Diffstat (limited to 'OvmfPkg/XenBusDxe/GrantTable.c')
| -rw-r--r-- | OvmfPkg/XenBusDxe/GrantTable.c | 221 |
1 files changed, 0 insertions, 221 deletions
diff --git a/OvmfPkg/XenBusDxe/GrantTable.c b/OvmfPkg/XenBusDxe/GrantTable.c deleted file mode 100644 index 90dec26ab0..0000000000 --- a/OvmfPkg/XenBusDxe/GrantTable.c +++ /dev/null @@ -1,221 +0,0 @@ -/** @file
- Grant Table function implementation.
-
- Grant Table are used to grant access to certain page of the current
- VM to an other VM.
-
- Author: Steven Smith (sos22@cam.ac.uk)
- Changes: Grzegorz Milos (gm281@cam.ac.uk)
- Copyright (C) 2006, Cambridge University
- Copyright (C) 2014, Citrix Ltd.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
- 1. Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
- 2. Redistributions in binary form must reproduce the above copyright
- notice, this list of conditions and the following disclaimer in the
- documentation and/or other materials provided with the distribution.
-
- THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
- FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- SUCH DAMAGE.
-**/
-#include "XenBusDxe.h"
-
-#include <IndustryStandard/Xen/memory.h>
-
-#include <Library/XenHypercallLib.h>
-#include <Library/SynchronizationLib.h>
-
-#include "GrantTable.h"
-
-#define NR_RESERVED_ENTRIES 8
-
-/* NR_GRANT_FRAMES must be less than or equal to that configured in Xen */
-#define NR_GRANT_FRAMES 4
-#define NR_GRANT_ENTRIES (NR_GRANT_FRAMES * EFI_PAGE_SIZE / sizeof(grant_entry_v1_t))
-
-STATIC grant_entry_v1_t *GrantTable = NULL;
-STATIC grant_ref_t GrantList[NR_GRANT_ENTRIES];
-STATIC EFI_LOCK mGrantListLock;
-#ifdef GNT_DEBUG
-STATIC BOOLEAN GrantInUseList[NR_GRANT_ENTRIES];
-#endif
-
-STATIC
-VOID
-XenGrantTablePutFreeEntry (
- grant_ref_t Ref
- )
-{
- EfiAcquireLock (&mGrantListLock);
-#ifdef GNT_DEBUG
- ASSERT (GrantInUseList[Ref]);
- GrantInUseList[Ref] = FALSE;
-#endif
- GrantList[Ref] = GrantList[0];
- GrantList[0] = Ref;
- EfiReleaseLock (&mGrantListLock);
-}
-
-STATIC
-grant_ref_t
-XenGrantTableGetFreeEntry (
- VOID
- )
-{
- grant_ref_t Ref;
-
- EfiAcquireLock (&mGrantListLock);
- Ref = GrantList[0];
- ASSERT (Ref >= NR_RESERVED_ENTRIES && Ref < NR_GRANT_ENTRIES);
- GrantList[0] = GrantList[Ref];
-#ifdef GNT_DEBUG
- ASSERT (!GrantInUseList[Ref]);
- GrantInUseList[Ref] = TRUE;
-#endif
- EfiReleaseLock (&mGrantListLock);
- return Ref;
-}
-
-STATIC
-grant_ref_t
-XenGrantTableGrantAccess (
- IN domid_t DomainId,
- IN UINTN Frame,
- IN BOOLEAN ReadOnly
- )
-{
- grant_ref_t Ref;
- UINT16 Flags;
-
- ASSERT (GrantTable != NULL);
- Ref = XenGrantTableGetFreeEntry ();
- GrantTable[Ref].frame = (UINT32)Frame;
- GrantTable[Ref].domid = DomainId;
- MemoryFence ();
- Flags = GTF_permit_access;
- if (ReadOnly) {
- Flags |= GTF_readonly;
- }
- GrantTable[Ref].flags = Flags;
-
- return Ref;
-}
-
-STATIC
-EFI_STATUS
-XenGrantTableEndAccess (
- grant_ref_t Ref
- )
-{
- UINT16 Flags, OldFlags;
-
- ASSERT (GrantTable != NULL);
- ASSERT (Ref >= NR_RESERVED_ENTRIES && Ref < NR_GRANT_ENTRIES);
-
- OldFlags = GrantTable[Ref].flags;
- do {
- if ((Flags = OldFlags) & (GTF_reading | GTF_writing)) {
- DEBUG ((EFI_D_WARN, "WARNING: g.e. still in use! (%x)\n", Flags));
- return EFI_NOT_READY;
- }
- OldFlags = InterlockedCompareExchange16 (&GrantTable[Ref].flags, Flags, 0);
- } while (OldFlags != Flags);
-
- XenGrantTablePutFreeEntry (Ref);
- return EFI_SUCCESS;
-}
-
-VOID
-XenGrantTableInit (
- IN XENBUS_DEVICE *Dev
- )
-{
- xen_add_to_physmap_t Parameters;
- INTN Index;
- INTN ReturnCode;
-
-#ifdef GNT_DEBUG
- SetMem(GrantInUseList, sizeof (GrantInUseList), 1);
-#endif
- EfiInitializeLock (&mGrantListLock, TPL_NOTIFY);
- for (Index = NR_RESERVED_ENTRIES; Index < NR_GRANT_ENTRIES; Index++) {
- XenGrantTablePutFreeEntry ((grant_ref_t)Index);
- }
-
- GrantTable = (VOID*)(UINTN) Dev->XenIo->GrantTableAddress;
- for (Index = 0; Index < NR_GRANT_FRAMES; Index++) {
- Parameters.domid = DOMID_SELF;
- Parameters.idx = Index;
- Parameters.space = XENMAPSPACE_grant_table;
- Parameters.gpfn = (xen_pfn_t) ((UINTN) GrantTable >> EFI_PAGE_SHIFT) + Index;
- ReturnCode = XenHypercallMemoryOp (XENMEM_add_to_physmap, &Parameters);
- if (ReturnCode != 0) {
- DEBUG ((EFI_D_ERROR,
- "Xen GrantTable, add_to_physmap hypercall error: %Ld\n",
- (INT64)ReturnCode));
- }
- }
-}
-
-VOID
-XenGrantTableDeinit (
- XENBUS_DEVICE *Dev
- )
-{
- INTN ReturnCode, Index;
- xen_remove_from_physmap_t Parameters;
-
- if (GrantTable == NULL) {
- return;
- }
-
- for (Index = NR_GRANT_FRAMES - 1; Index >= 0; Index--) {
- Parameters.domid = DOMID_SELF;
- Parameters.gpfn = (xen_pfn_t) ((UINTN) GrantTable >> EFI_PAGE_SHIFT) + Index;
- DEBUG ((EFI_D_INFO, "Xen GrantTable, removing %Lx\n",
- (UINT64)Parameters.gpfn));
- ReturnCode = XenHypercallMemoryOp (XENMEM_remove_from_physmap, &Parameters);
- if (ReturnCode != 0) {
- DEBUG ((EFI_D_ERROR,
- "Xen GrantTable, remove_from_physmap hypercall error: %Ld\n",
- (INT64)ReturnCode));
- }
- }
- GrantTable = NULL;
-}
-
-EFI_STATUS
-EFIAPI
-XenBusGrantAccess (
- IN XENBUS_PROTOCOL *This,
- IN domid_t DomainId,
- IN UINTN Frame, // MFN
- IN BOOLEAN ReadOnly,
- OUT grant_ref_t *RefPtr
- )
-{
- *RefPtr = XenGrantTableGrantAccess (DomainId, Frame, ReadOnly);
- return EFI_SUCCESS;
-}
-
-EFI_STATUS
-EFIAPI
-XenBusGrantEndAccess (
- IN XENBUS_PROTOCOL *This,
- IN grant_ref_t Ref
- )
-{
- return XenGrantTableEndAccess (Ref);
-}
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