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reorg: move mmio into library/device and spell out its API

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mmio is device-driver code, so it joins the other domains under
library/device/mmio/ (module name "mmio" unchanged — a pure relocation, only
the build paths move). And its abbreviated function names are spelled out per
docs/coding-standards.md:

  read  -> readRegister          mb  -> memoryBarrier
  write -> writeRegister         rmb -> readMemoryBarrier
                                 wmb -> writeMemoryBarrier

All call sites updated (virtio-gpu, usb-xhci-library, pci.Function); the two
display-driver placeholders import mmio but use nothing, so they're untouched.
Docs (driver-model graph, README layout, drivers.md, the FHS note) follow the
new path and names.

zig build + test green; virtio-gpu, display-native, display-reattach, usb-hid,
usb-hub, usb-storage, pci-scan pass.
This commit is contained in:
Daniel Samson
2026-07-22 21:28:32 +01:00
parent 7d540c4b2f
commit 5b874fc756
9 changed files with 82 additions and 83 deletions
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build.zig
+3 -3
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@@ -428,9 +428,9 @@ pub fn build(b: *std.Build) void {
// Typed volatile MMIO register access + memory-ordering barriers, for drivers on
// top of an mmio_map grant. Depends only on `builtin` (arch-conditional barriers);
// no target set, so it inherits each driver's. See library/mmio/mmio.zig.
// no target set, so it inherits each driver's. See library/device/mmio/mmio.zig.
const mmio_module = b.addModule("mmio", .{
.root_source_file = b.path("library/mmio/mmio.zig"),
.root_source_file = b.path("library/device/mmio/mmio.zig"),
});
// A device driver's view of its claimed PCI function: config-space header fields, BAR
@@ -969,7 +969,7 @@ pub fn build(b: *std.Build) void {
"library/device/acpi/aml/aml.zig", // AML parse + interpret, incl. Notify dispatch (M21)
"library/device/usb/usb-abi.zig", // wire sizes + bit packings + set-up packet encodings
"library/device/usb/usb-ids.zig", // class/subclass/protocol code assignments
"library/mmio/mmio.zig", // barriers assemble + registers round-trip
"library/device/mmio/mmio.zig", // barriers assemble + registers round-trip
"system/drivers/ps2-bus/scancode.zig", // set-2 decode + keyboard state machine
"system/drivers/ps2-bus/mouse-packet.zig", // 3-byte mouse packet assembly
"system/drivers/usb-hid/hid-report.zig", // HID boot-report keyboard/mouse decode