opnsense-src/sys
John Baldwin 4ba4cfaf9f acpi: Narrow workaround for broken interrupt settings on x86
Commit 9a7bf07ccd from 2016 introduced a workaround for some broken
BIOSes that specified active-lo instead of active-hi polarity for ISA
IRQs for UARTs.  The workaround assumed that edge-sensitive ISA IRQs
on x86 should always be active-hi.  However, some recent AMD systems
actually use active-lo edge-sensitive ISA IRQs (and not just for
UARTs, but also for the keyboard and PS/2 mouse devices) and the
override causes interrupts to be dropped resulting in boot time hangs,
non-working keyboards, etc.

Add a hw.acpi.override_isa_irq_polarity tunable (readable as a sysctl
post-boot) to control this quirk.  It can be set to 1 to force enable
the override and 0 to disable it.  The log of original message
mentions an Intel motherboard as the sample case, so default the
tunable to 1 on systems with an Intel CPU and 0 otherwise.

Special thanks to Matthias Lanter <freebsd@lanter-it.ch> for tracking
down boot time issues on recent AMD systems to mismatched interrupt
polarity.

PR:		270707
Reported by:	aixdroix_OSS@protonmail.com, Michael Dexter
Reported by:	mfw_burn@pm.me, Hannes Hfauswedell <h2+fbsdports@fsfe.org>
Reported by:	Matthias Lanter <freebsd@lanter-it.ch>
Reported by:	William Bulley <web@umich.edu>
Reviewed by:	imp, emaste
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D45554

(cherry picked from commit 0a34d050ae8ea14feddd3d2a62fd2f612613b2c5)
2024-07-22 15:54:14 -04:00
..
amd64 amd64 pmap_allocpte_nosleep(): stop testing tautological condition 2024-07-21 11:50:29 +03:00
arm NOTES: Add devices for iSCSI support 2024-07-18 13:14:08 -04:00
arm64 NOTES: Move the VirtIO entries to the MI NOTES file 2024-07-18 13:30:41 -04:00
bsm timerfd: Move implementation from linux compat to sys/kern 2023-08-24 14:28:56 -06:00
cam da: Update trim stats for WRITE SAME and ATA TRIM 2024-05-20 13:23:40 -06:00
cddl dtrace: Add a partial implementation of dtrace_getarg() on arm64 2024-07-14 12:16:01 -04:00
compat LinuxKPI: 802.11: make sure we can send DISASSOC or DEAUTH frames 2024-06-12 13:59:46 +00:00
conf sys: Retire the ISCSI_INITIATOR_DEBUG option 2024-07-18 13:33:23 -04:00
contrib MFC zfs/jail: Mark the zfs.mount_snapshot jail parameter as boolean. 2024-06-28 12:44:56 -07:00
crypto ossl: Rebuild the openssl asm 2024-07-15 08:09:43 +00:00
ddb ddb: Add sysctl flag CTLFLAG_TUN to loader tunable 2023-10-12 12:08:18 +08:00
dev acpi: Narrow workaround for broken interrupt settings on x86 2024-07-22 15:54:14 -04:00
dts add allwinner overlays for enabling additional USB ports 2024-02-17 16:15:10 +02:00
fs nfsd: Fix nfsrv_cleanclient so that it can be called with a mutex 2024-07-21 16:06:02 -07:00
gdb sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
geom geli: allocate a UMA pool earlier 2024-05-23 08:00:57 +02:00
gnu sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
i386 x86 NOTES: Move shared options from amd/i386 NOTES to x86 NOTES 2024-07-18 13:33:13 -04:00
isa isa: Postpone removal of the non-PNP driver until 15 2023-10-30 08:55:08 +08:00
kern kern: zero out stack buffer after copying out random bits 2024-07-21 00:24:55 -05:00
kgssapi nfscl/kgssapi: Fix Kerberized NFS mounts to pNFS servers 2023-12-23 17:03:58 -08:00
libkern arm64: Mark the armv8 crc32c as supporting BTI 2024-02-19 13:17:47 +00:00
modules sys: Enable NVMe drivers on all architectures 2024-07-18 13:19:18 -04:00
net route: Wrap long lines 2024-07-21 20:55:27 -04:00
net80211 net: Remove unneeded NULL check for the allocated ifnet 2024-07-12 20:03:37 +08:00
netgraph net: Remove unneeded NULL check for the allocated ifnet 2024-07-12 20:03:37 +08:00
netinet ip_mroute: Use NET_EPOCH_WAIT() macro 2024-07-05 23:11:51 +08:00
netinet6 icmp: correct the assertion that checks limit + jitter 2024-06-26 12:48:45 +08:00
netipsec ipsec esp: avoid dereferencing freed secasindex 2024-03-04 02:27:17 +02:00
netlink netlink: Wrap long lines 2024-07-21 20:55:27 -04:00
netpfil if_pflog: Limit the maximum unit via the new KPI 2024-07-20 22:42:59 +08:00
netsmb sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
nfs sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
nfsclient sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
nfsserver sys: Remove $FreeBSD$: one-line .h pattern 2023-08-16 11:54:18 -06:00
nlm sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
ofed ibcore: Mark write-only variables 2024-07-15 12:28:53 +00:00
opencrypto sys: Remove $FreeBSD$: one-line sh pattern 2023-08-16 11:54:58 -06:00
powerpc mpc85xx: Use device_set_desc() 2024-06-27 11:27:41 -04:00
riscv NOTES: Move the VirtIO entries to the MI NOTES file 2024-07-18 13:30:41 -04:00
rpc svc.c: Check for a non-NULL xp_socket 2024-05-31 15:35:18 -07:00
security MAC/do: allow to call setuid if real user id is 0 2024-06-27 10:47:06 +02:00
sys buf_ring: Make buf_ring.h amenable to userspace compilation 2024-07-21 20:55:27 -04:00
teken teken: fix style in teken_wcwidth.h 2023-10-21 17:28:35 +03:00
tests netlink: move NETLINK define to opt_global.h 2023-10-16 09:42:33 +02:00
tools arm_kernel_bothdr.awk: Update to latest ota 2024-04-24 17:57:55 -06:00
ufs Eliminate unnecessary UFS1 integrity checks. 2024-03-04 16:09:10 -08:00
vm vm_page: add vm_page_clearref() helper 2024-07-21 11:50:29 +03:00
x86 DMAR pagetables pages: handle ref_count special references 2024-07-21 11:50:29 +03:00
xdr sys: Remove $FreeBSD$: one-line .c pattern 2023-08-16 11:54:36 -06:00
xen sys: Remove $FreeBSD$: one-line sh pattern 2023-08-16 11:54:58 -06:00
Makefile sys: Remove $FreeBSD$: one-line sh pattern 2023-08-16 11:54:58 -06:00
README.md sys/README.md: Add a section for documentation 2023-08-03 11:07:41 -03:00

FreeBSD Kernel Source:

This directory contains the source files and build glue that make up the FreeBSD kernel and its modules, including both original and contributed software.

Kernel configuration files are located in the conf/ subdirectory of each architecture. GENERIC is the configuration used in release builds. NOTES contains documentation of all possible entries. LINT is a compile-only configuration used to maximize build coverage and detect regressions.

Documentation:

Source code documentation is maintained in a set of man pages, under section 9. These pages are located in share/man/man9, from the top-level of the src tree. Consult intro(9) for an overview of existing pages.

Some additional high-level documentation of the kernel is maintained in the Architecture Handbook.

Source Roadmap:

Directory Description
amd64 AMD64 (64-bit x86) architecture support
arm 32-bit ARM architecture support
arm64 64-bit ARM (AArch64) architecture support
cam Common Access Method storage subsystem - cam(4) and ctl(4)
cddl CDDL-licensed optional sources such as DTrace
conf kernel build glue
compat Linux compatibility layer, FreeBSD 32-bit compatibility
contrib 3rd-party imported software such as OpenZFS
crypto crypto drivers
ddb interactive kernel debugger - ddb(4)
fs most filesystems, excluding UFS, NFS, and ZFS
dev device drivers and other arch independent code
gdb kernel remote GDB stub - gdb(4)
geom GEOM framework - geom(4)
i386 i386 (32-bit x86) architecture support
kern main part of the kernel
libkern libc-like and other support functions for kernel use
modules kernel module infrastructure
net core networking code
net80211 wireless networking (IEEE 802.11) - net80211(4)
netgraph graph-based networking subsystem - netgraph(4)
netinet IPv4 protocol implementation - inet(4)
netinet6 IPv6 protocol implementation - inet6(4)
netipsec IPsec protocol implementation - ipsec(4)
netpfil packet filters - ipfw(4), pf(4), and ipfilter(4)
opencrypto OpenCrypto framework - crypto(7)
powerpc PowerPC/POWER (32 and 64-bit) architecture support
riscv 64-bit RISC-V architecture support
security security facilities - audit(4) and mac(4)
sys kernel headers
tests kernel unit tests
ufs Unix File System - ffs(7)
vm virtual memory system
x86 code shared by AMD64 and i386 architectures