OvmfPkg/IndustryStandard/Xen: replace MIT license text with SPDX ID

[mirror_edk2.git] / OvmfPkg / Include / IndustryStandard / Xen / xen.h

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