zircon/system/public/zircon/syscalls-next.h

// Copyright 2020 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef SYSROOT_ZIRCON_SYSCALLS_NEXT_H_
#define SYSROOT_ZIRCON_SYSCALLS_NEXT_H_

#ifndef _KERNEL

#include <zircon/syscalls.h>

__BEGIN_CDECLS

// Make sure this matches <zircon/syscalls.h>.
#define _ZX_SYSCALL_DECL(name, type, attrs, nargs, arglist, prototype) \
  extern attrs type zx_##name prototype;                               \
  extern attrs type _zx_##name prototype;

#ifdef __clang__
#define _ZX_SYSCALL_ANNO(attr) __attribute__((attr))
#else
#define _ZX_SYSCALL_ANNO(attr)  // Nothing for compilers without the support.
#endif

#include <zircon/syscalls/internal/cdecls-next.inc>

#undef _ZX_SYSCALL_ANNO
#undef _ZX_SYSCALL_DECL

__END_CDECLS

#endif  // !_KERNEL

#include <stdint.h>
#include <zircon/compiler.h>

__BEGIN_CDECLS

// ====== Pager writeback support ====== //
//
// Make sure the constants defined here do not overlap with VMO / pager constants defined in
// <zircon/types.h> or <zircon/syscalls/port.h>. These constants will eventually get moved over.

// VM Object creation options
#define ZX_VMO_TRAP_DIRTY ((uint32_t)1u << 3)

// Pager opcodes
#define ZX_PAGER_OP_DIRTY ((uint32_t)2u)
#define ZX_PAGER_OP_WRITEBACK_BEGIN ((uint32_t)3u)
#define ZX_PAGER_OP_WRITEBACK_END ((uint32_t)4u)

// zx_packet_page_request_t::command
#define ZX_PAGER_VMO_DIRTY ((uint16_t)2)

// Range type used by the zx_pager_query_dirty_ranges() syscall.
typedef struct zx_vmo_dirty_range {
  // Represents the range [offset, offset + length).
  uint64_t offset;
  uint64_t length;
  // Any options applicable to the range.
  // ZX_VMO_DIRTY_RANGE_IS_ZERO indicates that the range contains all zeros.
  uint64_t options;
} zx_vmo_dirty_range_t;

// options flags for zx_vmo_dirty_range_t
#define ZX_VMO_DIRTY_RANGE_IS_ZERO ((uint64_t)1u)

// Struct used by the zx_pager_query_vmo_stats() syscall.
typedef struct zx_pager_vmo_stats {
  // Will be set to ZX_PAGER_VMO_STATS_MODIFIED if the VMO was modified, or 0 otherwise.
  // Note that this can be set to 0 if a previous zx_pager_query_vmo_stats() call specified the
  // ZX_PAGER_RESET_VMO_STATS option, which resets the modified state.
  uint32_t modified;
} zx_pager_vmo_stats_t;

// values for zx_pager_vmo_stats.modified
#define ZX_PAGER_VMO_STATS_MODIFIED ((uint32_t)1u)

// options for zx_pager_query_vmo_stats()
#define ZX_PAGER_RESET_VMO_STATS ((uint32_t)1u)

// ====== End of pager writeback support ====== //

__END_CDECLS

#endif  // SYSROOT_ZIRCON_SYSCALLS_NEXT_H_