/* initramfs_data includes the compressed binary that is the filesystem used for early user space. Note: Older versions of "as" (prior to binutils 2.11.90.0.23 released on 2001-07-14) dit not support .incbin. If you are forced to use older binutils than that then the following trick can be applied to create the resulting binary: ld -m elf_i386 --format binary --oformat elf32-i386 -r \ -T initramfs_data.scr initramfs_data.cpio.gz -o initramfs_data.o ld -m elf_i386 -r -o built-in.o initramfs_data.o For including the .init.ramfs sections, see include/asm-generic/vmlinux.lds. The above example is for i386 - the parameters vary from architectures. Eventually look up LDFLAGS_BLOB in an older version of the arch/$(ARCH)/Makefile to see the flags used before .incbin was introduced. Using .incbin has the advantage over ld that the correct flags are set in the ELF header, as required by certain architectures. */ #include #include .section .init.ramfs,"a" __irf_start: .incbin __stringify(INITRAMFS_IMAGE) __irf_end: .section .init.ramfs.info,"a" .globl VMLINUX_SYMBOL(__initramfs_size) VMLINUX_SYMBOL(__initramfs_size): #ifdef CONFIG_64BIT .quad __irf_end - __irf_start #else .long __irf_end - __irf_start #endif net-next plumbingsTobias Klauser
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authorJiri Kosina <jkosina@suse.cz>2017-01-27 22:25:52 +0000
committerIngo Molnar <mingo@kernel.org>2017-01-28 09:18:56 +0100
commitbf29bddf0417a4783da3b24e8c9e017ac649326f (patch)
tree54a05a4883b73f80e4e1d8c4b15750aa01c39932 /tools/thermal/tmon/pid.c
parent883af14e67e8b8702b5560aa64c888c0cd0bd66c (diff)
x86/efi: Always map the first physical page into the EFI pagetables
Commit: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode") stopped creating 1:1 mappings for all RAM, when running in native 64-bit mode. It turns out though that there are 64-bit EFI implementations in the wild (this particular problem has been reported on a Lenovo Yoga 710-11IKB), which still make use of the first physical page for their own private use, even though they explicitly mark it EFI_CONVENTIONAL_MEMORY in the memory map. In case there is no mapping for this particular frame in the EFI pagetables, as soon as firmware tries to make use of it, a triple fault occurs and the system reboots (in case of the Yoga 710-11IKB this is very early during bootup). Fix that by always mapping the first page of physical memory into the EFI pagetables. We're free to hand this page to the BIOS, as trim_bios_range() will reserve the first page and isolate it away from memory allocators anyway. Note that just reverting 129766708 alone is not enough on v4.9-rc1+ to fix the regression on affected hardware, as this commit: ab72a27da ("x86/efi: Consolidate region mapping logic") later made the first physical frame not to be mapped anyway. Reported-by: Hanka Pavlikova <hanka@ucw.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bp@suse.de> Cc: Laura Abbott <labbott@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vojtech Pavlik <vojtech@ucw.cz> Cc: Waiman Long <waiman.long@hpe.com> Cc: linux-efi@vger.kernel.org Cc: stable@kernel.org # v4.8+ Fixes: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode") Link: http://lkml.kernel.org/r/20170127222552.22336-1-matt@codeblueprint.co.uk [ Tidied up the changelog and the comment. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/thermal/tmon/pid.c')