063e1567d8
This patch contain minimal set of changes to initial IVRS implementation to make it work reliably. Code in this patch was tested with Xen 4.8 and Debian 4.14.y - this software stack survived 100x reboots without any hang on PC Engines apu2c4. Previously using IVRS provided by AGESA lead to 29/100 hangs. MMIO base shall not be hard coded since this value depends on platform design. Performance counters were selected experimentally, since lack of them cause 4.14.y panic: [ 1.064229] AMD-Vi: IOMMU performance counters supported [ 1.069579] BUG: unable to handle kernel paging request at ffffaffc4065c000 [ 1.073554] IP: iommu_go_to_state+0xf8a/0x1260 [ 1.073554] PGD 12a11f067 P4D 12a11f067 PUD 12a120067 PMD 129b69067 PTE 0 [ 1.073554] Oops: 0000 [#1] SMP NOPTI [ 1.073554] Modules linked in: [ 1.073554] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.14.50 #13 [ 1.073554] Hardware name: PC Engines apu2/apu2, BIOS 4.8-1174-gf12b3046f0-d2 [ 1.073554] task: ffff8d5d69b9f040 task.stack: ffffaffc40648000 [ 1.073554] RIP: 0010:iommu_go_to_state+0xf8a/0x1260 [ 1.073554] RSP: 0018:ffffaffc4064be28 EFLAGS: 00010282 [ 1.073554] RAX: ffffaffc40658000 RBX: ffff8d5d69bae000 RCX: ffffffff99e57b88 [ 1.073554] RDX: 0000000000000000 RSI: 0000000000000092 RDI: 0000000000000246 [ 1.073554] RBP: 0000000000000040 R08: 0000000000000001 R09: 0000000000000170 [ 1.073554] R10: 0000000000000000 R11: ffffffff9a435e2d R12: 0000000000000000 [ 1.073554] R13: ffffffff9a29a830 R14: 0000000000000000 R15: 0000000000000000 [ 1.073554] FS: 0000000000000000(0000) GS:ffff8d5d6ec80000(0000) knlGS:00000 [ 1.073554] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1.073554] CR2: ffffaffc4065c000 CR3: 000000010fa0a000 CR4: 00000000000406e0 [ 1.073554] Call Trace: [ 1.073554] ? set_debug_rodata+0x11/0x11 [ 1.073554] amd_iommu_init+0x11/0x89 [ 1.073554] pci_iommu_init+0x16/0x3f [ 1.073554] ? e820__memblock_setup+0x60/0x60 [ 1.073554] do_one_initcall+0x51/0x190 [ 1.073554] ? set_debug_rodata+0x11/0x11 [ 1.073554] kernel_init_freeable+0x16b/0x1ec [ 1.073554] ? rest_init+0xb0/0xb0 [ 1.073554] kernel_init+0xa/0xf7 [ 1.073554] ret_from_fork+0x22/0x40 [ 1.073554] Code: d2 31 f6 48 89 df e8 d8 15 02 ff 85 c0 75 d1 48 8b 44 24 2 [ 1.073554] RIP: iommu_go_to_state+0xf8a/0x1260 RSP: ffffaffc4064be28 [ 1.073554] CR2: ffffaffc4065c000 [ 1.073554] ---[ end trace 44588f98aa7c7c0b ]--- [ 1.255973] Kernel panic - not syncing: Attempted to kill init! exitcode=0x09 [ 1.255973] [ 1.259934] ---[ end Kernel panic - not syncing: Attempted to kill init! exi9 Possible future improvements: - compare device entries with values returned by AGESA - enable EFRSup (this is enabled in AGESA) - try various IVHD flags (there is difference between initial implementation and AGESA) Change-Id: I7e3a3d21f295ae96962d7718b9568fc4b67eb23d Signed-off-by: Piotr Król <piotr.krol@3mdeb.com> Reviewed-on: https://review.coreboot.org/27602 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Marc Jones <marc@marcjonesconsulting.com> |
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|---|---|---|
| 3rdparty | ||
| Documentation | ||
| configs | ||
| payloads | ||
| src | ||
| util | ||
| .checkpatch.conf | ||
| .clang-format | ||
| .gitignore | ||
| .gitmodules | ||
| .gitreview | ||
| COPYING | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc | ||
| README.md | ||
| gnat.adc | ||
| toolchain.inc | ||
README.md
coreboot README
coreboot is a Free Software project aimed at replacing the proprietary BIOS (firmware) found in most computers. coreboot performs a little bit of hardware initialization and then executes additional boot logic, called a payload.
With the separation of hardware initialization and later boot logic, coreboot can scale from specialized applications that run directly firmware, run operating systems in flash, load custom bootloaders, or implement firmware standards, like PC BIOS services or UEFI. This allows for systems to only include the features necessary in the target application, reducing the amount of code and flash space required.
coreboot was formerly known as LinuxBIOS.
Payloads
After the basic initialization of the hardware has been performed, any desired "payload" can be started by coreboot.
See https://www.coreboot.org/Payloads for a list of supported payloads.
Supported Hardware
coreboot supports a wide range of chipsets, devices, and mainboards.
For details please consult:
- https://www.coreboot.org/Supported_Motherboards
- https://www.coreboot.org/Supported_Chipsets_and_Devices
Build Requirements
- make
- gcc / g++
Because Linux distribution compilers tend to use lots of patches. coreboot
does lots of "unusual" things in its build system, some of which break due
to those patches, sometimes by gcc aborting, sometimes - and that's worse -
by generating broken object code.
Two options: use our toolchain (eg. make crosstools-i386) or enable the
ANY_TOOLCHAINKconfig option if you're feeling lucky (no support in this case). - iasl (for targets with ACPI support)
- pkg-config
- libssl-dev (openssl)
Optional:
- doxygen (for generating/viewing documentation)
- gdb (for better debugging facilities on some targets)
- ncurses (for
make menuconfigandmake nconfig) - flex and bison (for regenerating parsers)
Building coreboot
Please consult https://www.coreboot.org/Build_HOWTO for details.
Testing coreboot Without Modifying Your Hardware
If you want to test coreboot without any risks before you really decide to use it on your hardware, you can use the QEMU system emulator to run coreboot virtually in QEMU.
Please see https://www.coreboot.org/QEMU for details.
Website and Mailing List
Further details on the project, a FAQ, many HOWTOs, news, development guidelines and more can be found on the coreboot website:
You can contact us directly on the coreboot mailing list:
https://www.coreboot.org/Mailinglist
Copyright and License
The copyright on coreboot is owned by quite a large number of individual developers and companies. Please check the individual source files for details.
coreboot is licensed under the terms of the GNU General Public License (GPL). Some files are licensed under the "GPL (version 2, or any later version)", and some files are licensed under the "GPL, version 2". For some parts, which were derived from other projects, other (GPL-compatible) licenses may apply. Please check the individual source files for details.
This makes the resulting coreboot images licensed under the GPL, version 2.