93f981c7ea
The firmware's AML is now interpreted. uACPI 6.1.1 (MIT) is fetched by ports/uacpi, checksum-verified, and compiled into the kernel unmodified, the same way lwIP is. kernel/acpi/host.c is its host layer: memory, mapping, port and PCI config I/O, time, mutexes and events that spin before the scheduler exists, the SCI, and an "acpi" thread for the work the SCI defers. PCI interrupts go where the board says. pci_init() now routes every device's INTx through the root bridge's _PRT before drivers bind. It follows link devices' _CRS, uses a bridge's own _PRT where the namespace has one, and swizzles through bridges that don't. Before this, INTx waited on the 8259's line number, which is the wrong pin in APIC mode. irq_register() takes a trigger mode rather than a level/low flag, because q35's links and most SCIs are level, active-high. The MADT's interrupt source overrides are now parsed, and are what places the SCI. The power button syncs the filesystems and powers off. shutdown() and reboot() go through the firmware's S5 and reset register first, and only then fall back to the emulators' ports, which a real board does not answer. Tested under QEMU: q35 with MSI off routes xHCI to GSI 22, level/active-high, and it takes real interrupts with nothing polled. system_powerdown powers off q35 and i440fx (QEMU exits 0), and q35 with 4 CPUs boots from NVMe with USB hot-plug working alongside. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
44 lines
1.4 KiB
Makefile
44 lines
1.4 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0-or-later
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# uACPI -- the ACPI AML interpreter. MIT; see LICENSE in the tarball and
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# docs/licensing.md.
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#
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# Kernel code, like lwIP: nothing is installed into the sysroot. This
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# directory fetches and unpacks a pinned release, and the top-level Makefile
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# compiles its sources straight into the kernel against kernel/acpi/, which
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# supplies everything uACPI asks of a host. That is why there is no build or
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# install rule below and no dependency on musl.
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#
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# Chosen over ACPICA, which does the same job in roughly ten times the code
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# and asks more of its host, and over writing an interpreter here: AML is a
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# whole language, every firmware vendor's compiler emits its own dialect of
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# it, and uACPI is tested against real machines' tables as a matter of course.
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include ../mk/port.mk
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UACPI_VERSION := 6.1.1
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UACPI_URL := https://github.com/uACPI/uACPI/archive/refs/tags/$(UACPI_VERSION).tar.gz
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UACPI_SHA256 := 40f2e278b2080e69f4eaa3384404944874d430e50b72c1066cab2ba476e2b769
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TARBALL := $(DISTDIR)/uacpi-$(UACPI_VERSION).tar.gz
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$(TARBALL): | $(DISTDIR)
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curl -fsSL -o $@ $(UACPI_URL)
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sh $(SHA256CHECK) "$(UACPI_SHA256)" "$@"
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download: $(TARBALL)
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$(SRCDIR): $(TARBALL)
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mkdir -p $(PORTDIR)
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cd $(PORTDIR) && tar xzf $(abspath $<)
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mv $(PORTDIR)/uACPI-$(UACPI_VERSION) $@
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# The kernel build depends on this directory existing, nothing more.
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all: | $(SRCDIR)
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install:
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clean:
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rm -rf $(PORTDIR)
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distclean: clean
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rm -f $(TARBALL)
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