// Copyright 2019 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.
library zx;

type SystemPowerctlArg = struct {
        // TODO(scottmg): More unnamed unions.
        //union {
        //  struct {
        //    uint8_t target_s_state; // Value between 1 and 5 indicating which S-state
        //    uint8_t sleep_type_a;   // Value from ACPI VM (SLP_TYPa)
        //    uint8_t sleep_type_b;   // Value from ACPI VM (SLP_TYPb)
        //  } acpi_transition_s_state;
        //  struct {
        //    uint32_t power_limit; // PL1 value in milliwatts
        //    uint32_t time_window; // PL1 time window in microseconds
        //    uint8_t clamp;        // PL1 clamping enable
        //    uint8_t enable;       // PL1 enable
        //  } x86_power_limit;
        //};
        };

@transport("Syscall")
protocol system {
    @const
    @vdsocall
    system_get_dcache_line_size() -> (struct {
        size uint32;
    });

    /// Get number of logical processors on the system.
    @const
    @vdsocall
    system_get_num_cpus() -> (struct {
        count uint32;
    });

    /// Get version string for system.
    @const
    @vdsocall
    system_get_version_string() -> (struct {
        version string_view;
    });

    /// Get the page size for the system.
    @const
    @vdsocall
    system_get_page_size() -> (struct {
        size uint32;
    });

    /// Get amount of physical memory on the system.
    @vdsocall
    system_get_physmem() -> (struct {
        physmem uint64;
    });

    // TODO(scottmg): "features" has a features attribute. I'm not sure if/how it's used.
    /// Get supported hardware capabilities.
    @vdsocall
    system_get_features(struct {
        kind uint32;
    }) -> (struct {
        status status;
        features uint32;
    });

    /// Retrieve a handle to a system event.
    /// Rights: None.
    system_get_event(resource struct {
        root_job handle:JOB;
        kind uint32;
    }) -> (resource struct {
        status status;
        event handle:EVENT;
    });

    /// Set CPU performance parameters.
    /// Rights: resource must have resource kind ZX_RSRC_KIND_SYSTEM.
    system_set_performance_info(resource struct {
        resource handle:RESOURCE;
        topic uint32;
        info const_voidptr;
        count usize;
    }) -> (resource struct {
        status status;
    });

    /// Get CPU performance parameters.
    /// Rights: resource must have resource kind ZX_RSRC_KIND_SYSTEM.
    system_get_performance_info(resource struct {
        resource handle:RESOURCE;
        topic uint32;
        count usize;
    }) -> (resource struct {
        status status;
        info voidptr;
        output_count usize;
    });

    /// Soft reboot the system with a new kernel and bootimage.
    /// Rights: resource must have resource kind ZX_RSRC_KIND_ROOT.
    /// Rights: kernel_vmo must be of type ZX_OBJ_TYPE_VMO and have ZX_RIGHT_READ.
    /// Rights: bootimage_vmo must be of type ZX_OBJ_TYPE_VMO and have ZX_RIGHT_READ.
    system_mexec(resource struct {
        resource handle:RESOURCE;
        kernel_vmo handle:VMO;
        bootimage_vmo handle:VMO;
    }) -> (struct {
        status status;
    });

    /// Return a ZBI containing ZBI entries necessary to boot this system.
    /// Rights: resource must have resource kind ZX_RSRC_KIND_ROOT.
    system_mexec_payload_get(resource struct {
        resource handle:RESOURCE;
    }) -> (struct {
        status status;
        buffer vector_void;
    });

    /// Rights: resource must have resource kind ZX_RSRC_KIND_SYSTEM with base ZX_RSRC_SYSTEM_POWER_BASE.
    system_powerctl(resource struct {
        resource handle:RESOURCE;
        cmd uint32;
        arg SystemPowerctlArg;
    }) -> (struct {
        status status;
    });
};