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audk/OvmfPkg/Include/IndustryStandard/Xen/xen.h

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/******************************************************************************
* xen.h
*
* Guest OS interface to Xen.
*
* SPDX-License-Identifier: MIT
*
* Copyright (c) 2004, K A Fraser
*/
#ifndef __XEN_PUBLIC_XEN_H__
#define __XEN_PUBLIC_XEN_H__
//
// Xen interface version used by Tianocore
//
#define __XEN_INTERFACE_VERSION__ 0x00040400
#include "xen-compat.h"
#if defined(MDE_CPU_IA32) || defined(MDE_CPU_X64)
#include "arch-x86/xen.h"
#elif defined(__arm__) || defined (__aarch64__)
#include "arch-arm/xen.h"
#else
#error "Unsupported architecture"
#endif
#ifndef __ASSEMBLY__
/* Guest handles for primitive C types. */
DEFINE_XEN_GUEST_HANDLE(CHAR8);
__DEFINE_XEN_GUEST_HANDLE(uchar, UINT8);
DEFINE_XEN_GUEST_HANDLE(INT32);
__DEFINE_XEN_GUEST_HANDLE(uint, UINT32);
#if __XEN_INTERFACE_VERSION__ < 0x00040300
DEFINE_XEN_GUEST_HANDLE(INTN);
__DEFINE_XEN_GUEST_HANDLE(ulong, UINTN);
#endif
DEFINE_XEN_GUEST_HANDLE(VOID);
DEFINE_XEN_GUEST_HANDLE(UINT64);
DEFINE_XEN_GUEST_HANDLE(xen_pfn_t);
DEFINE_XEN_GUEST_HANDLE(xen_ulong_t);
#endif
/*
* HYPERCALLS
*/
/* `incontents 100 hcalls List of hypercalls
* ` enum hypercall_num { // __HYPERVISOR_* => HYPERVISOR_*()
*/
#define __HYPERVISOR_set_trap_table 0
#define __HYPERVISOR_mmu_update 1
#define __HYPERVISOR_set_gdt 2
#define __HYPERVISOR_stack_switch 3
#define __HYPERVISOR_set_callbacks 4
#define __HYPERVISOR_fpu_taskswitch 5
#define __HYPERVISOR_sched_op_compat 6 /* compat since 0x00030101 */
#define __HYPERVISOR_platform_op 7
#define __HYPERVISOR_set_debugreg 8
#define __HYPERVISOR_get_debugreg 9
#define __HYPERVISOR_update_descriptor 10
#define __HYPERVISOR_memory_op 12
#define __HYPERVISOR_multicall 13
#define __HYPERVISOR_update_va_mapping 14
#define __HYPERVISOR_set_timer_op 15
#define __HYPERVISOR_event_channel_op_compat 16 /* compat since 0x00030202 */
#define __HYPERVISOR_xen_version 17
#define __HYPERVISOR_console_io 18
#define __HYPERVISOR_physdev_op_compat 19 /* compat since 0x00030202 */
#define __HYPERVISOR_grant_table_op 20
#define __HYPERVISOR_vm_assist 21
#define __HYPERVISOR_update_va_mapping_otherdomain 22
#define __HYPERVISOR_iret 23 /* x86 only */
#define __HYPERVISOR_vcpu_op 24
#define __HYPERVISOR_set_segment_base 25 /* x86/64 only */
#define __HYPERVISOR_mmuext_op 26
#define __HYPERVISOR_xsm_op 27
#define __HYPERVISOR_nmi_op 28
#define __HYPERVISOR_sched_op 29
#define __HYPERVISOR_callback_op 30
#define __HYPERVISOR_xenoprof_op 31
#define __HYPERVISOR_event_channel_op 32
#define __HYPERVISOR_physdev_op 33
#define __HYPERVISOR_hvm_op 34
#define __HYPERVISOR_sysctl 35
#define __HYPERVISOR_domctl 36
#define __HYPERVISOR_kexec_op 37
#define __HYPERVISOR_tmem_op 38
#define __HYPERVISOR_xc_reserved_op 39 /* reserved for XenClient */
/* Architecture-specific hypercall definitions. */
#define __HYPERVISOR_arch_0 48
#define __HYPERVISOR_arch_1 49
#define __HYPERVISOR_arch_2 50
#define __HYPERVISOR_arch_3 51
#define __HYPERVISOR_arch_4 52
#define __HYPERVISOR_arch_5 53
#define __HYPERVISOR_arch_6 54
#define __HYPERVISOR_arch_7 55
/* ` } */
/*
* HYPERCALL COMPATIBILITY.
*/
/* New sched_op hypercall introduced in 0x00030101. */
#if __XEN_INTERFACE_VERSION__ < 0x00030101
#undef __HYPERVISOR_sched_op
#define __HYPERVISOR_sched_op __HYPERVISOR_sched_op_compat
#endif
/* New event-channel and physdev hypercalls introduced in 0x00030202. */
#if __XEN_INTERFACE_VERSION__ < 0x00030202
#undef __HYPERVISOR_event_channel_op
#define __HYPERVISOR_event_channel_op __HYPERVISOR_event_channel_op_compat
#undef __HYPERVISOR_physdev_op
#define __HYPERVISOR_physdev_op __HYPERVISOR_physdev_op_compat
#endif
/* New platform_op hypercall introduced in 0x00030204. */
#if __XEN_INTERFACE_VERSION__ < 0x00030204
#define __HYPERVISOR_dom0_op __HYPERVISOR_platform_op
#endif
#ifndef __ASSEMBLY__
typedef UINT16 domid_t;
/* Domain ids >= DOMID_FIRST_RESERVED cannot be used for ordinary domains. */
#define DOMID_FIRST_RESERVED (0x7FF0U)
/* DOMID_SELF is used in certain contexts to refer to oneself. */
#define DOMID_SELF (0x7FF0U)
/*
* DOMID_IO is used to restrict page-table updates to mapping I/O memory.
* Although no Foreign Domain need be specified to map I/O pages, DOMID_IO
* is useful to ensure that no mappings to the OS's own heap are accidentally
* installed. (e.g., in Linux this could cause havoc as reference counts
* aren't adjusted on the I/O-mapping code path).
* This only makes sense in MMUEXT_SET_FOREIGNDOM, but in that context can
* be specified by any calling domain.
*/
#define DOMID_IO (0x7FF1U)
/*
* DOMID_XEN is used to allow privileged domains to map restricted parts of
* Xen's heap space (e.g., the machine_to_phys table).
* This only makes sense in MMUEXT_SET_FOREIGNDOM, and is only permitted if
* the caller is privileged.
*/
#define DOMID_XEN (0x7FF2U)
/*
* DOMID_COW is used as the owner of sharable pages */
#define DOMID_COW (0x7FF3U)
/* DOMID_INVALID is used to identify pages with unknown owner. */
#define DOMID_INVALID (0x7FF4U)
/* Idle domain. */
#define DOMID_IDLE (0x7FFFU)
#if __XEN_INTERFACE_VERSION__ < 0x00040400
/*
* Event channel endpoints per domain (when using the 2-level ABI):
* 1024 if a INTN is 32 bits; 4096 if a INTN is 64 bits.
*/
#define NR_EVENT_CHANNELS EVTCHN_2L_NR_CHANNELS
#endif
struct vcpu_time_info {
/*
* Updates to the following values are preceded and followed by an
* increment of 'version'. The guest can therefore detect updates by
* looking for changes to 'version'. If the least-significant bit of
* the version number is set then an update is in progress and the guest
* must wait to read a consistent set of values.
* The correct way to interact with the version number is similar to
* Linux's seqlock: see the implementations of read_seqbegin/read_seqretry.
*/
UINT32 version;
UINT32 pad0;
UINT64 tsc_timestamp; /* TSC at last update of time vals. */
UINT64 system_time; /* Time, in nanosecs, since boot. */
/*
* Current system time:
* system_time +
* ((((tsc - tsc_timestamp) << tsc_shift) * tsc_to_system_mul) >> 32)
* CPU frequency (Hz):
* ((10^9 << 32) / tsc_to_system_mul) >> tsc_shift
*/
UINT32 tsc_to_system_mul;
INT8 tsc_shift;
INT8 pad1[3];
}; /* 32 bytes */
typedef struct vcpu_time_info vcpu_time_info_t;
struct vcpu_info {
/*
* 'evtchn_upcall_pending' is written non-zero by Xen to indicate
* a pending notification for a particular VCPU. It is then cleared
* by the guest OS /before/ checking for pending work, thus avoiding
* a set-and-check race. Note that the mask is only accessed by Xen
* on the CPU that is currently hosting the VCPU. This means that the
* pending and mask flags can be updated by the guest without special
* synchronisation (i.e., no need for the x86 LOCK prefix).
* This may seem suboptimal because if the pending flag is set by
* a different CPU then an IPI may be scheduled even when the mask
* is set. However, note:
* 1. The task of 'interrupt holdoff' is covered by the per-event-
* channel mask bits. A 'noisy' event that is continually being
* triggered can be masked at source at this very precise
* granularity.
* 2. The main purpose of the per-VCPU mask is therefore to restrict
* reentrant execution: whether for concurrency control, or to
* prevent unbounded stack usage. Whatever the purpose, we expect
* that the mask will be asserted only for short periods at a time,
* and so the likelihood of a 'spurious' IPI is suitably small.
* The mask is read before making an event upcall to the guest: a
* non-zero mask therefore guarantees that the VCPU will not receive
* an upcall activation. The mask is cleared when the VCPU requests
* to block: this avoids wakeup-waiting races.
*/
UINT8 evtchn_upcall_pending;
#ifdef XEN_HAVE_PV_UPCALL_MASK
UINT8 evtchn_upcall_mask;
#else /* XEN_HAVE_PV_UPCALL_MASK */
UINT8 pad0;
#endif /* XEN_HAVE_PV_UPCALL_MASK */
xen_ulong_t evtchn_pending_sel;
struct arch_vcpu_info arch;
struct vcpu_time_info time;
}; /* 64 bytes (x86) */
#ifndef __XEN__
typedef struct vcpu_info vcpu_info_t;
#endif
/*
* `incontents 200 startofday_shared Start-of-day shared data structure
* Xen/kernel shared data -- pointer provided in start_info.
*
* This structure is defined to be both smaller than a page, and the
* only data on the shared page, but may vary in actual size even within
* compatible Xen versions; guests should not rely on the size
* of this structure remaining constant.
*/
struct shared_info {
struct vcpu_info vcpu_info[XEN_LEGACY_MAX_VCPUS];
/*
* A domain can create "event channels" on which it can send and receive
* asynchronous event notifications. There are three classes of event that
* are delivered by this mechanism:
* 1. Bi-directional inter- and intra-domain connections. Domains must
* arrange out-of-band to set up a connection (usually by allocating
* an unbound 'listener' port and avertising that via a storage service
* such as xenstore).
* 2. Physical interrupts. A domain with suitable hardware-access
* privileges can bind an event-channel port to a physical interrupt
* source.
* 3. Virtual interrupts ('events'). A domain can bind an event-channel
* port to a virtual interrupt source, such as the virtual-timer
* device or the emergency console.
*
* Event channels are addressed by a "port index". Each channel is
* associated with two bits of information:
* 1. PENDING -- notifies the domain that there is a pending notification
* to be processed. This bit is cleared by the guest.
* 2. MASK -- if this bit is clear then a 0->1 transition of PENDING
* will cause an asynchronous upcall to be scheduled. This bit is only
* updated by the guest. It is read-only within Xen. If a channel
* becomes pending while the channel is masked then the 'edge' is lost
* (i.e., when the channel is unmasked, the guest must manually handle
* pending notifications as no upcall will be scheduled by Xen).
*
* To expedite scanning of pending notifications, any 0->1 pending
* transition on an unmasked channel causes a corresponding bit in a
* per-vcpu selector word to be set. Each bit in the selector covers a
* 'C INTN' in the PENDING bitfield array.
*/
xen_ulong_t evtchn_pending[sizeof(xen_ulong_t) * 8];
xen_ulong_t evtchn_mask[sizeof(xen_ulong_t) * 8];
/*
* Wallclock time: updated only by control software. Guests should base
* their gettimeofday() syscall on this wallclock-base value.
*/
UINT32 wc_version; /* Version counter: see vcpu_time_info_t. */
UINT32 wc_sec; /* Secs 00:00:00 UTC, Jan 1, 1970. */
UINT32 wc_nsec; /* Nsecs 00:00:00 UTC, Jan 1, 1970. */
struct arch_shared_info arch;
};
#ifndef __XEN__
typedef struct shared_info shared_info_t;
#endif
/* Turn a plain number into a C UINTN constant. */
#define __mk_unsigned_long(x) x ## UL
#define mk_unsigned_long(x) __mk_unsigned_long(x)
__DEFINE_XEN_GUEST_HANDLE(uint8, UINT8);
__DEFINE_XEN_GUEST_HANDLE(uint16, UINT16);
__DEFINE_XEN_GUEST_HANDLE(uint32, UINT32);
__DEFINE_XEN_GUEST_HANDLE(uint64, UINT64);
#else /* __ASSEMBLY__ */
/* In assembly code we cannot use C numeric constant suffixes. */
#define mk_unsigned_long(x) x
#endif /* !__ASSEMBLY__ */
#endif /* __XEN_PUBLIC_XEN_H__ */
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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