afa6b1ccfa
The RISC-V ISA defines a simple console that is availiable via SBI calls on all systems. The SBI console is designed to be availiable at all times, so while it's most natural to use this as an early printk target it's also possible to use this as the system console when there isn't a better one availiable. This patch adds support for the RISC-V SBI console via the HVC infastructure. It's entirely independent from our early printk support, which results in early boot messages appearing twice over the SBI console. As far as I can tell that's the fault of our early printk support (we should support earlycon) as opposed to this driver. There is one checkpatch.pl warning here: to check the MAINTAINERS file. They're all matched by the "K: riscv" line. Signed-off-by: Palmer Dabbelt <palmer@sifive.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
128 lines
3.5 KiB
Plaintext
128 lines
3.5 KiB
Plaintext
if TTY
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config HVC_DRIVER
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bool
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help
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Generic "hypervisor virtual console" infrastructure for various
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hypervisors (pSeries, iSeries, Xen).
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It will automatically be selected if one of the back-end console drivers
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is selected.
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config HVC_IRQ
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bool
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config HVC_CONSOLE
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bool "pSeries Hypervisor Virtual Console support"
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depends on PPC_PSERIES
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select HVC_DRIVER
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select HVC_IRQ
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help
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pSeries machines when partitioned support a hypervisor virtual
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console. This driver allows each pSeries partition to have a console
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which is accessed via the HMC.
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config HVC_OLD_HVSI
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bool "Old driver for pSeries serial port (/dev/hvsi*)"
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depends on HVC_CONSOLE
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default n
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config HVC_OPAL
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bool "OPAL Console support"
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depends on PPC_POWERNV
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select HVC_DRIVER
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select HVC_IRQ
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default y
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help
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PowerNV machines running under OPAL need that driver to get a console
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config HVC_RTAS
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bool "IBM RTAS Console support"
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depends on PPC_RTAS
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select HVC_DRIVER
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help
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IBM Console device driver which makes use of RTAS
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config HVC_IUCV
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bool "z/VM IUCV Hypervisor console support (VM only)"
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depends on S390 && NET
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select HVC_DRIVER
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select IUCV
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default y
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help
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This driver provides a Hypervisor console (HVC) back-end to access
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a Linux (console) terminal via a z/VM IUCV communication path.
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config HVC_XEN
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bool "Xen Hypervisor Console support"
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depends on XEN
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select HVC_DRIVER
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select HVC_IRQ
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default y
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help
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Xen virtual console device driver
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config HVC_XEN_FRONTEND
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bool "Xen Hypervisor Multiple Consoles support"
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depends on HVC_XEN
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select XEN_XENBUS_FRONTEND
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default y
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help
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Xen driver for secondary virtual consoles
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config HVC_UDBG
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bool "udbg based fake hypervisor console"
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depends on PPC
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select HVC_DRIVER
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default n
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help
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This is meant to be used during HW bring up or debugging when
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no other console mechanism exist but udbg, to get you a quick
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console for userspace. Do NOT enable in production kernels.
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config HVC_DCC
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bool "ARM JTAG DCC console"
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depends on ARM || ARM64
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select HVC_DRIVER
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help
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This console uses the JTAG DCC on ARM to create a console under the HVC
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driver. This console is used through a JTAG only on ARM. If you don't have
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a JTAG then you probably don't want this option.
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config HVC_BFIN_JTAG
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bool "Blackfin JTAG console"
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depends on BLACKFIN
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select HVC_DRIVER
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help
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This console uses the Blackfin JTAG to create a console under the
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the HVC driver. If you don't have JTAG, then you probably don't
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want this option.
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config HVC_RISCV_SBI
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bool "RISC-V SBI console support"
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depends on RISCV
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select HVC_DRIVER
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help
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This enables support for console output via RISC-V SBI calls, which
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is normally used only during boot to output printk.
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If you don't know what do to here, say Y.
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config HVCS
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tristate "IBM Hypervisor Virtual Console Server support"
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depends on PPC_PSERIES && HVC_CONSOLE
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help
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Partitionable IBM Power5 ppc64 machines allow hosting of
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firmware virtual consoles from one Linux partition by
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another Linux partition. This driver allows console data
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from Linux partitions to be accessed through TTY device
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interfaces in the device tree of a Linux partition running
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this driver.
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To compile this driver as a module, choose M here: the
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module will be called hvcs. Additionally, this module
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will depend on arch specific APIs exported from hvcserver.ko
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which will also be compiled when this driver is built as a
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module.
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endif # TTY
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