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The PCI scan from ring 3: pci-bus walks the ECAM it mapped (M19.1)

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The manager matches the pci_host_bridge node and spawns pci-bus with the
bridge id as its assignment — hello, supervision, restart, all the M18
contract for free. The driver claims the bridge, maps the ECAM window
(resource 0) through the ordinary mmio grant, and repeats the kernel's
brute-force bus/device/function walk from user space. The pci-scan
scenario builds its expected marker from the kernel's own function count,
so the two enumerations must agree exactly — the equivalence that
licenses retiring the kernel walk in M19.3.
This commit is contained in:
Daniel Samson
2026-07-13 02:05:32 +01:00
parent a2a05d0b3d
commit 10b89c06ff
6 changed files with 229 additions and 4 deletions
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build.zig
+3
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@@ -339,6 +339,7 @@ pub fn build(b: *std.Build) void {
const ps2_keyboard_exe = addUserBinary(b, kernel_target, runtime_module, posix_module, mmio_module, xkeyboard_config_module, acpi_ids_module, "ps2-keyboard", "system/drivers/ps2-bus/keyboard.zig");
const ps2_mouse_exe = addUserBinary(b, kernel_target, runtime_module, posix_module, mmio_module, xkeyboard_config_module, acpi_ids_module, "ps2-mouse", "system/drivers/ps2-bus/mouse.zig");
const usb_xhci_bus_exe = addUserBinary(b, kernel_target, runtime_module, posix_module, mmio_module, xkeyboard_config_module, acpi_ids_module, "usb-xhci-bus", "system/drivers/usb-xhci-bus/usb-xhci-bus.zig");
const pci_bus_exe = addUserBinary(b, kernel_target, runtime_module, posix_module, mmio_module, xkeyboard_config_module, acpi_ids_module, "pci-bus", "system/drivers/pci-bus/pci-bus.zig");
// A test fixture, not a real driver: hellos to the device manager, then faults —
// what the driver-restart scenario drives the crash-loop cap with.
const crash_test_exe = addUserBinary(b, kernel_target, runtime_module, posix_module, mmio_module, xkeyboard_config_module, acpi_ids_module, "crash-test", "system/services/crash-test/crash-test.zig");
@@ -388,6 +389,8 @@ pub fn build(b: *std.Build) void {
mk_run.addFileArg(ps2_mouse_exe.getEmittedBin());
mk_run.addArg("usb-xhci-bus");
mk_run.addFileArg(usb_xhci_bus_exe.getEmittedBin());
mk_run.addArg("pci-bus");
mk_run.addFileArg(pci_bus_exe.getEmittedBin());
mk_run.addArg("crash-test");
mk_run.addFileArg(crash_test_exe.getEmittedBin());
mk_run.addArg("device-list");