WSL2-Linux-Kernel/arch/arm64/Kconfig.debug

menu "Kernel hacking"

source "lib/Kconfig.debug"

config FRAME_POINTER
	bool
	default y

config STRICT_DEVMEM
	bool "Filter access to /dev/mem"
	depends on MMU
	help
	  If this option is disabled, you allow userspace (root) access to all
	  of memory, including kernel and userspace memory. Accidental
	  access to this is obviously disastrous, but specific access can
	  be used by people debugging the kernel.

	  If this option is switched on, the /dev/mem file only allows
	  userspace access to memory mapped peripherals.

	  If in doubt, say Y.

config EARLY_PRINTK
	bool "Early printk support"
	default y
	help
	  Say Y here if you want to have an early console using the
	  earlyprintk=<name>[,<addr>][,<options>] kernel parameter. It
	  is assumed that the early console device has been initialised
	  by the boot loader prior to starting the Linux kernel.

config PID_IN_CONTEXTIDR
	bool "Write the current PID to the CONTEXTIDR register"
	help
	  Enabling this option causes the kernel to write the current PID to
	  the CONTEXTIDR register, at the expense of some additional
	  instructions during context switch. Say Y here only if you are
	  planning to use hardware trace tools with this kernel.

endmenu
arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de> 2012-04-20 17:45:54 +04:00			`menu "Kernel hacking"`

			`source "lib/Kconfig.debug"`

			`config FRAME_POINTER`
			`bool`
			`default y`

arm64: Add missing Kconfig for CONFIG_STRICT_DEVMEM The Kconfig for CONFIG_STRICT_DEVMEM is missing despite being used in mmap.c. Add it. Signed-off-by: Laura Abbott <lauraa@codeaurora.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 2014-04-05 04:30:50 +04:00			`config STRICT_DEVMEM`
			`bool "Filter access to /dev/mem"`
			`depends on MMU`
			`help`
			`If this option is disabled, you allow userspace (root) access to all`
			`of memory, including kernel and userspace memory. Accidental`
			`access to this is obviously disastrous, but specific access can`
			`be used by people debugging the kernel.`

			`If this option is switched on, the /dev/mem file only allows`
			`userspace access to memory mapped peripherals.`

			`If in doubt, say Y.`

arm64: Add simple earlyprintk support This patch adds support for "earlyprintk=" parameter on the kernel command line. The format is: earlyprintk=<name>[,<addr>][,<options>] where <name> is the name of the (UART) device, e.g. "pl011", <addr> is the I/O address. The <options> aren't currently used. The mapping of the earlyprintk device is done very early during kernel boot and there are restrictions on which functions it can call. A special early_io_map() function is added which creates the mapping from the pre-defined EARLY_IOBASE to the device I/O address passed via the kernel parameter. The pgd entry corresponding to EARLY_IOBASE is pre-populated in head.S during kernel boot. Only PL011 is currently supported and it is assumed that the interface is already initialised by the boot loader before the kernel is started. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Arnd Bergmann <arnd@arndb.de> 2012-10-23 17:55:08 +04:00			`config EARLY_PRINTK`
			`bool "Early printk support"`
			`default y`
			`help`
			`Say Y here if you want to have an early console using the`
			`earlyprintk=<name>[,<addr>][,<options>] kernel parameter. It`
			`is assumed that the early console device has been initialised`
			`by the boot loader prior to starting the Linux kernel.`

arm64: mm: update CONTEXTIDR register to contain PID of current process This patch is a port of 575320d62 ("ARM: 7445/1: mm: update CONTEXTIDR register to contain PID of current process") from ARM that introduces a new Kconfig option which, when enabled, causes the kernel to write the PID of the current task into the CONTEXTIDR register on context switch. This is useful when analysing hardware trace, since writes to this register can be configured to emit an event into the trace stream. Signed-off-by: Will Deacon <will.deacon@arm.com> [catalin.marinas@arm.com: contextidr_thread_switch() moved to mmu_context.h] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> 2013-01-17 16:31:45 +04:00			`config PID_IN_CONTEXTIDR`
			`bool "Write the current PID to the CONTEXTIDR register"`
			`help`
			`Enabling this option causes the kernel to write the current PID to`
			`the CONTEXTIDR register, at the expense of some additional`
			`instructions during context switch. Say Y here only if you are`
			`planning to use hardware trace tools with this kernel.`

arm64: Build infrastructure This patch adds Makefile and Kconfig files required for building an AArch64 kernel. Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Arnd Bergmann <arnd@arndb.de> 2012-04-20 17:45:54 +04:00			`endmenu`