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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2019-02-02 10:41:18 +0100
committerIngo Molnar <mingo@kernel.org>2019-02-04 08:27:30 +0100
commit69c1f396f25b805aeff08f06d2e992c315ee5b1e (patch)
tree7463653c8bd95300d4ae5697f00a4e061f8c613d /arch/x86/Kconfig.debug
parentce9084ba0d1d8030adee7038ace32f8d9d423d0f (diff)
downloadlinux-69c1f396f25b805aeff08f06d2e992c315ee5b1e.tar.bz2
efi/x86: Convert x86 EFI earlyprintk into generic earlycon implementation
Move the x86 EFI earlyprintk implementation to a shared location under drivers/firmware and tweak it slightly so we can expose it as an earlycon implementation (which is generic) rather than earlyprintk (which is only implemented for a few architectures) This also involves switching to write-combine mappings by default (which is required on ARM since device mappings lack memory semantics, and so memcpy/memset may not be used on them), and adding support for shared memory framebuffers on cache coherent non-x86 systems (which do not tolerate mismatched attributes). Note that 32-bit ARM does not populate its struct screen_info early enough for earlycon=efifb to work, so it is disabled there. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Alexander Graf <agraf@suse.de> Cc: AKASHI Takahiro <takahiro.akashi@linaro.org> Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Heinrich Schuchardt <xypron.glpk@gmx.de> Cc: Jeffrey Hugo <jhugo@codeaurora.org> Cc: Lee Jones <lee.jones@linaro.org> Cc: Leif Lindholm <leif.lindholm@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Peter Jones <pjones@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/20190202094119.13230-10-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/Kconfig.debug')
-rw-r--r--arch/x86/Kconfig.debug10
1 files changed, 0 insertions, 10 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 0723dff17e6c..15d0fbe27872 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -40,16 +40,6 @@ config EARLY_PRINTK_DBGP
with klogd/syslogd or the X server. You should normally say N here,
unless you want to debug such a crash. You need usb debug device.
-config EARLY_PRINTK_EFI
- bool "Early printk via the EFI framebuffer"
- depends on EFI && EARLY_PRINTK
- select FONT_SUPPORT
- ---help---
- Write kernel log output directly into the EFI framebuffer.
-
- This is useful for kernel debugging when your machine crashes very
- early before the console code is initialized.
-
config EARLY_PRINTK_USB_XDBC
bool "Early printk via the xHCI debug port"
depends on EARLY_PRINTK && PCI