90 lines
2.0 KiB
C
90 lines
2.0 KiB
C
#ifndef _IPXE_XEN_H
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#define _IPXE_XEN_H
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/** @file
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*
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* Xen interface
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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/* Define Xen interface version before including any Xen header files */
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#define __XEN_INTERFACE_VERSION__ 0x00040400
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#include <stdint.h>
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#include <ipxe/bitops.h>
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#include <ipxe/uaccess.h>
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#include <xen/xen.h>
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#include <xen/event_channel.h>
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/* Memory barrier macros used by ring.h */
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#define xen_mb() mb()
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#define xen_rmb() rmb()
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#define xen_wmb() wmb()
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struct xen_hypercall;
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/** A Xen grant table */
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struct xen_grant {
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/** Grant table entries */
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struct grant_entry_v1 *table;
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/** Total grant table length */
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size_t len;
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/** Entry size shift (for later version tables) */
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unsigned int shift;
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/** Number of grant table entries in use */
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unsigned int used;
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/** Most recently used grant reference */
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unsigned int ref;
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};
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/** A XenStore */
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struct xen_store {
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/** XenStore domain interface */
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struct xenstore_domain_interface *intf;
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/** Event channel */
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evtchn_port_t port;
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};
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/** A Xen hypervisor */
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struct xen_hypervisor {
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/** Hypercall table */
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struct xen_hypercall *hypercall;
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/** Shared info page */
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struct shared_info *shared;
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/** Grant table */
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struct xen_grant grant;
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/** XenStore */
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struct xen_store store;
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};
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/**
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* Test and clear pending event
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*
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* @v xen Xen hypervisor
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* @v port Event channel port
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* @ret pending Event was pending
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*/
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static inline __attribute__ (( always_inline )) int
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xenevent_pending ( struct xen_hypervisor *xen, evtchn_port_t port ) {
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return test_and_clear_bit ( port, xen->shared->evtchn_pending );
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}
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#include <bits/xen.h>
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/**
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* Convert a Xen status code to an iPXE status code
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*
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* @v xenrc Xen status code (negated)
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* @ret rc iPXE status code (before negation)
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*
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* Xen status codes are defined in the file include/xen/errno.h in the
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* Xen repository. They happen to match the Linux error codes, some
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* of which can be found in our include/ipxe/errno/linux.h.
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*/
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#define EXEN( xenrc ) EPLATFORM ( EINFO_EPLATFORM, -(xenrc) )
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#endif /* _IPXE_XEN_H */
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