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- /* SPDX-License-Identifier: MIT
- *
- * xen.h
- *
- * Guest OS interface to Xen.
- *
- * Copyright (c) 2004, K A Fraser
- */
- #ifndef __XEN_PUBLIC_XEN_H__
- #define __XEN_PUBLIC_XEN_H__
- #include <xen/arm/interface.h>
- /*
- * XEN "SYSTEM CALLS" (a.k.a. HYPERCALLS).
- */
- /*
- * x86_32: EAX = vector; EBX, ECX, EDX, ESI, EDI = args 1, 2, 3, 4, 5.
- * EAX = return value
- * (argument registers may be clobbered on return)
- * x86_64: RAX = vector; RDI, RSI, RDX, R10, R8, R9 = args 1, 2, 3, 4, 5, 6.
- * RAX = return value
- * (argument registers not clobbered on return; RCX, R11 are)
- */
- #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
- #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
- #define __HYPERVISOR_xen_version 17
- #define __HYPERVISOR_console_io 18
- #define __HYPERVISOR_physdev_op_compat 19
- #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 */
- #define __HYPERVISOR_xenpmu_op 40
- #define __HYPERVISOR_dm_op 41
- /* 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
- #ifndef __ASSEMBLY__
- typedef u16 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)
- 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.
- */
- u8 evtchn_upcall_pending;
- u8 evtchn_upcall_mask;
- xen_ulong_t evtchn_pending_sel;
- struct arch_vcpu_info arch;
- struct pvclock_vcpu_time_info time;
- }; /* 64 bytes (x86) */
- /*
- * Xen/kernel shared data -- pointer provided in start_info.
- * NB. We expect that this struct is smaller than a page.
- */
- struct shared_info {
- struct vcpu_info vcpu_info[MAX_VIRT_CPUS];
- /*
- * 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 long' 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.
- */
- struct pvclock_wall_clock wc;
- struct arch_shared_info arch;
- };
- #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__ */
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