zircon/kernel/lib/userabi/vdso/zx_system_get_features.cc

// Copyright 2018 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.

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

#include "data-constants.h"
#include "private.h"

__EXPORT zx_status_t _zx_system_get_features(uint32_t kind, uint32_t* features) {
  switch (kind) {
    case ZX_FEATURE_KIND_CPU: {
      uint32_t cpu_features = DATA_CONSTANTS.features.cpu;
      if (!(cpu_features & ZX_HAS_CPU_FEATURES)) {
        return ZX_ERR_NOT_SUPPORTED;
      }

      *features = cpu_features;
      return ZX_OK;
    }
    case ZX_FEATURE_KIND_HW_BREAKPOINT_COUNT: {
      *features = DATA_CONSTANTS.features.hw_breakpoint_count;
      return ZX_OK;
    }
    case ZX_FEATURE_KIND_HW_WATCHPOINT_COUNT: {
      *features = DATA_CONSTANTS.features.hw_watchpoint_count;
      return ZX_OK;
    }
    case ZX_FEATURE_KIND_ADDRESS_TAGGING: {
      *features = DATA_CONSTANTS.features.address_tagging;
      return ZX_OK;
    }
    case ZX_FEATURE_KIND_VM: {
      *features = DATA_CONSTANTS.features.vm;
      return ZX_OK;
    }
    default:
      return ZX_ERR_NOT_SUPPORTED;
  }
}

VDSO_INTERFACE_FUNCTION(zx_system_get_features);