104 lines
4.3 KiB
Zig
104 lines
4.3 KiB
Zig
//! The firmware-agnostic discovery facade.
|
|
//!
|
|
//! The kernel calls `platform.discover()` and gets back a generic `DeviceTree`
|
|
//! without ever naming ACPI or device-tree — the same way it imports `architecture`
|
|
//! without naming x86_64. Which backend runs is decided *at runtime* from what
|
|
//! the bootloader handed us (an ACPI RSDP today, a device-tree blob later),
|
|
//! because a single image — a future ARM kernel especially — may boot under
|
|
//! either firmware. That's a deliberate divergence from `architecture`, which is a
|
|
//! compile-time choice.
|
|
|
|
const std = @import("std");
|
|
const boot_handoff = @import("boot-handoff");
|
|
const device_model = @import("device-model.zig");
|
|
const acpi = @import("acpi.zig");
|
|
const power = @import("power.zig");
|
|
const devicetree = @import("device-tree.zig");
|
|
|
|
pub const DeviceTree = device_model.DeviceTree;
|
|
pub const Device = device_model.Device;
|
|
pub const DeviceClass = device_model.DeviceClass;
|
|
pub const Resource = device_model.Resource;
|
|
pub const ResourceKind = device_model.ResourceKind;
|
|
pub const Hal = device_model.Hal;
|
|
pub const PowerInformation = acpi.PowerInformation;
|
|
pub const AmlStats = acpi.AmlStats;
|
|
pub const PlatformInformation = acpi.PlatformInformation;
|
|
pub const RegisterAccess = acpi.RegisterAccess;
|
|
pub const IsoEntry = acpi.IsoEntry;
|
|
pub const Cpu = acpi.Cpu;
|
|
|
|
/// The register map + sleep types discovery extracted, for logging/diagnostics.
|
|
pub fn powerInformation() PowerInformation {
|
|
return acpi.power_information;
|
|
}
|
|
|
|
/// The scalar firmware facts the architecture layer needs to avoid legacy assumptions
|
|
/// (8259 presence, LAPIC base, PM timer, SPCR UART, IRQ overrides).
|
|
pub fn platformInformation() PlatformInformation {
|
|
return acpi.platform_information;
|
|
}
|
|
|
|
/// AML parse integrity/diagnostics (namespace node count, bytes consumed).
|
|
/// The number of Device objects in the kernel's own AML namespace, or 0 if the
|
|
/// parse produced none — the `acpi-parse` test compares the ring-3 service's
|
|
/// count against this.
|
|
pub fn amlDeviceCount() usize {
|
|
return acpi.amlDeviceCount();
|
|
}
|
|
|
|
pub fn amlStats() AmlStats {
|
|
return acpi.aml_stats;
|
|
}
|
|
|
|
/// The usable logical processors discovered during enumeration — one entry per
|
|
/// core danos may schedule on, each carrying the Local APIC ID an SMP wake targets.
|
|
/// `len` is the hardware's degree of parallelism: how many tasks *could* run at the
|
|
/// same instant once the application processors are started. Today only the
|
|
/// bootstrap processor is actually running, so starting the rest is the pending SMP
|
|
/// step (see docs/smp.md). Borrowed from static storage populated by `discover`.
|
|
pub fn cpus() []const Cpu {
|
|
return acpi.cpu_information.cpus[0..acpi.cpu_information.count];
|
|
}
|
|
|
|
/// Non-zero only if enumeration found more processors than the static pool holds
|
|
/// (the surplus were dropped from `cpus()`); surfaced so the cap is never silent.
|
|
pub fn cpusDropped() usize {
|
|
return acpi.cpu_information.dropped;
|
|
}
|
|
|
|
/// Enumerate hardware into a fresh device tree. `hal` supplies the hardware
|
|
/// primitives the backend needs (MMIO mapping for PCIe configuration space, port I/O for
|
|
/// ACPI registers); pass the architecture implementation. Errors leave nothing to clean up
|
|
/// beyond the tree's own allocations.
|
|
pub fn discover(
|
|
boot_information: *const boot_handoff.BootInformation,
|
|
allocator: std.mem.Allocator,
|
|
hal: Hal,
|
|
) !DeviceTree {
|
|
var device_tree = try DeviceTree.init(allocator);
|
|
|
|
if (boot_information.acpi_rsdp != 0) {
|
|
const memory_regions = @as([*]const boot_handoff.MemoryRegion, @ptrFromInt(boot_handoff.physicalToVirtual(boot_information.memory_map.regions)))[0..boot_information.memory_map.len];
|
|
try acpi.discover(boot_information.acpi_rsdp, memory_regions, &device_tree, hal);
|
|
} else {
|
|
// No ACPI RSDP. A device-tree boot would parse its blob here; today that
|
|
// path is a stub, so this reports the machine described itself no way we
|
|
// understand yet.
|
|
try devicetree.discover(&device_tree);
|
|
}
|
|
|
|
return device_tree;
|
|
}
|
|
|
|
/// Restart the machine. Never returns on success; returns only if no reset method
|
|
/// worked (extremely unlikely). Backend-agnostic entry the kernel calls.
|
|
pub fn reboot(hal: Hal) void {
|
|
power.reboot(hal);
|
|
}
|
|
|
|
/// Power the machine off (ACPI S5). Never returns on success.
|
|
pub fn shutdown(hal: Hal) void {
|
|
power.shutdown(hal);
|
|
}
|