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- #ifndef _IPXE_XENGRANT_H
- #define _IPXE_XENGRANT_H
-
- /** @file
- *
- * Xen grant tables
- *
- */
-
- FILE_LICENCE ( GPL2_OR_LATER );
-
- #include <stdint.h>
- #include <ipxe/io.h>
- #include <ipxe/xen.h>
- #include <xen/grant_table.h>
-
- /**
- * Query grant table size
- *
- * @v xen Xen hypervisor
- * @v size Table size
- * @ret xenrc Xen status code
- */
- static inline __attribute__ (( always_inline )) int
- xengrant_query_size ( struct xen_hypervisor *xen,
- struct gnttab_query_size *size ) {
-
- return xen_hypercall_3 ( xen, __HYPERVISOR_grant_table_op,
- GNTTABOP_query_size,
- virt_to_phys ( size ), 1 );
- }
-
- /**
- * Set grant table version
- *
- * @v xen Xen hypervisor
- * @v version Version
- * @ret xenrc Xen status code
- */
- static inline __attribute__ (( always_inline )) int
- xengrant_set_version ( struct xen_hypervisor *xen,
- struct gnttab_set_version *version ) {
-
- return xen_hypercall_3 ( xen, __HYPERVISOR_grant_table_op,
- GNTTABOP_set_version,
- virt_to_phys ( version ), 1 );
- }
-
- /**
- * Invalidate access to a page
- *
- * @v xen Xen hypervisor
- * @v ref Grant reference
- */
- static inline __attribute__ (( always_inline )) void
- xengrant_invalidate ( struct xen_hypervisor *xen, grant_ref_t ref ) {
- union grant_entry_v2 *entry = &xen->grant.table[ref];
-
- /* Sanity check */
- assert ( ( readw ( &entry->hdr.flags ) &
- ( GTF_reading | GTF_writing ) ) == 0 );
-
- /* This should apparently be done using a cmpxchg instruction.
- * We omit this: partly in the interests of simplicity, but
- * mainly since our control flow generally does not permit
- * failure paths to themselves fail.
- */
- writew ( 0, &entry->hdr.flags );
- }
-
- /**
- * Permit access to a page
- *
- * @v xen Xen hypervisor
- * @v ref Grant reference
- * @v domid Domain ID
- * @v subflags Additional flags
- * @v page Page start
- */
- static inline __attribute__ (( always_inline )) void
- xengrant_permit_access ( struct xen_hypervisor *xen, grant_ref_t ref,
- domid_t domid, unsigned int subflags, void *page ) {
- union grant_entry_v2 *entry = &xen->grant.table[ref];
- unsigned long frame = ( virt_to_phys ( page ) / PAGE_SIZE );
-
- writew ( domid, &entry->full_page.hdr.domid );
- if ( sizeof ( physaddr_t ) == sizeof ( uint64_t ) ) {
- writeq ( frame, &entry->full_page.frame );
- } else {
- writel ( frame, &entry->full_page.frame );
- }
- wmb();
- writew ( ( GTF_permit_access | subflags ), &entry->full_page.hdr.flags);
- wmb();
- }
-
- extern int xengrant_alloc ( struct xen_hypervisor *xen, grant_ref_t *refs,
- unsigned int count );
- extern void xengrant_free ( struct xen_hypervisor *xen, grant_ref_t *refs,
- unsigned int count );
-
- #endif /* _IPXE_XENGRANT_H */
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