/****************************************************************************** * 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 TscTimestamp; /* TSC at last update of time vals. */ UINT64 SystemTime; /* 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 TscToSystemMultiplier; INT8 TscShift; INT8 pad1[3]; }; /* 32 bytes */ typedef struct vcpu_time_info XEN_VCPU_TIME_INFO; 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 VcpuInfo[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; typedef struct shared_info XEN_SHARED_INFO; #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: */