mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-23 19:43:33 +00:00
208 lines
8.1 KiB
C
208 lines
8.1 KiB
C
/* 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__ */
|