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[PATCH] xtensa: Architecture support for Tensilica Xtensa Part 1
The attached patches provides part 1 of an architecture implementation for the Tensilica Xtensa CPU series. Signed-off-by: Chris Zankel <chris@zankel.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Chris Zankel
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Linus Torvalds
Linus Torvalds
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48b415ca13
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# For a description of the syntax of this configuration file,
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# see Documentation/kbuild/config-language.txt.
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mainmenu "Linux/Xtensa Kernel Configuration"
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config FRAME_POINTER
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bool
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default n
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config XTENSA
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bool
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default y
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help
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Xtensa processors are 32-bit RISC machines designed by Tensilica
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primarily for embedded systems. These processors are both
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configurable and extensible. The Linux port to the Xtensa
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architecture supports all processor configurations and extensions,
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with reasonable minimum requirements. The Xtensa Linux project has
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a home page at <http://xtensa.sourceforge.net/>.
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config UID16
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bool
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default n
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config RWSEM_XCHGADD_ALGORITHM
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bool
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default y
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config HAVE_DEC_LOCK
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bool
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default y
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config GENERIC_HARDIRQS
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bool
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default y
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source "init/Kconfig"
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menu "Processor type and features"
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choice
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prompt "Xtensa Processor Configuration"
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default XTENSA_CPU_LINUX_BE
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config XTENSA_CPU_LINUX_BE
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bool "linux_be"
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---help---
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The linux_be processor configuration is the baseline Xtensa
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configurations included in this kernel and also used by
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binutils, gcc, and gdb. It contains no TIE, no coprocessors,
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and the following configuration options:
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Code Density Option 2 Misc Special Registers
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NSA/NSAU Instructions 128-bit Data Bus Width
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Processor ID 8K, 2-way I and D Caches
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Zero-Overhead Loops 2 Inst Address Break Registers
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Big Endian 2 Data Address Break Registers
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64 General-Purpose Registers JTAG Interface and Trace Port
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17 Interrupts MMU w/ TLBs and Autorefill
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3 Interrupt Levels 8 Autorefill Ways (I/D TLBs)
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3 Timers Unaligned Exceptions
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endchoice
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config MMU
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bool
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default y
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config XTENSA_UNALIGNED_USER
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bool "Unaligned memory access in use space"
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---help---
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The Xtensa architecture currently does not handle unaligned
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memory accesses in hardware but through an exception handler.
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Per default, unaligned memory accesses are disabled in user space.
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Say Y here to enable unaligned memory access in user space.
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config PREEMPT
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bool "Preemptible Kernel"
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---help---
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This option reduces the latency of the kernel when reacting to
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real-time or interactive events by allowing a low priority process to
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be preempted even if it is in kernel mode executing a system call.
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Unfortunately the kernel code has some race conditions if both
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CONFIG_SMP and CONFIG_PREEMPT are enabled, so this option is
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currently disabled if you are building an SMP kernel.
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Say Y here if you are building a kernel for a desktop, embedded
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or real-time system. Say N if you are unsure.
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config MATH_EMULATION
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bool "Math emulation"
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help
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Can we use information of configuration file?
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config HIGHMEM
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bool "High memory support"
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endmenu
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menu "Platform options"
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choice
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prompt "Xtensa System Type"
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default XTENSA_PLATFORM_ISS
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config XTENSA_PLATFORM_ISS
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bool "ISS"
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help
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ISS is an acronym for Tensilica's Instruction Set Simulator.
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config XTENSA_PLATFORM_XT2000
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bool "XT2000"
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help
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XT2000 is the name of Tensilica's feature-rich emulation platform.
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This hardware is capable of running a full Linux distribution.
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endchoice
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config XTENSA_CALIBRATE_CCOUNT
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bool "Auto calibration of the CPU clock rate"
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---help---
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On some platforms (XT2000, for example), the CPU clock rate can
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vary. The frequency can be determined, however, by measuring
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against a well known, fixed frequency, such as an UART oscillator.
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config XTENSA_CPU_CLOCK
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int "CPU clock rate [MHz]"
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depends on !XTENSA_CALIBRATE_CCOUNT
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default "16"
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config GENERIC_CALIBRATE_DELAY
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bool "Auto calibration of the BogoMIPS value"
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---help---
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The BogoMIPS value can easily derived from the CPU frequency.
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config CMDLINE_BOOL
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bool "Default bootloader kernel arguments"
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config CMDLINE
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string "Initial kernel command string"
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depends on CMDLINE_BOOL
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default "console=ttyS0,38400 root=/dev/ram"
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help
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On some architectures (EBSA110 and CATS), there is currently no way
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for the boot loader to pass arguments to the kernel. For these
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architectures, you should supply some command-line options at build
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time by entering them here. As a minimum, you should specify the
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memory size and the root device (e.g., mem=64M root=/dev/nfs).
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config SERIAL_CONSOLE
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bool
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depends on XTENSA_PLATFORM_ISS
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default y
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config XTENSA_ISS_NETWORK
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bool
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depends on XTENSA_PLATFORM_ISS
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default y
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endmenu
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menu "Bus options"
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config PCI
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bool "PCI support" if !XTENSA_PLATFORM_ISS
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depends on !XTENSA_PLATFORM_ISS
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default y
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help
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Find out whether you have a PCI motherboard. PCI is the name of a
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bus system, i.e. the way the CPU talks to the other stuff inside
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your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
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VESA. If you have PCI, say Y, otherwise N.
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The PCI-HOWTO, available from
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<http://www.linuxdoc.org/docs.html#howto>, contains valuable
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information about which PCI hardware does work under Linux and which
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doesn't
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source "drivers/pci/Kconfig"
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config HOTPLUG
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bool "Support for hot-pluggable devices"
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---help---
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Say Y here if you want to plug devices into your computer while
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the system is running, and be able to use them quickly. In many
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cases, the devices can likewise be unplugged at any time too.
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One well known example of this is PCMCIA- or PC-cards, credit-card
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size devices such as network cards, modems or hard drives which are
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plugged into slots found on all modern laptop computers. Another
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example, used on modern desktops as well as laptops, is USB.
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Enable HOTPLUG and KMOD, and build a modular kernel. Get agent
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software (at <http://linux-hotplug.sourceforge.net/>) and install it.
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Then your kernel will automatically call out to a user mode "policy
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agent" (/sbin/hotplug) to load modules and set up software needed
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to use devices as you hotplug them.
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source "drivers/pcmcia/Kconfig"
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source "drivers/pci/hotplug/Kconfig"
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endmenu
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menu "Exectuable file formats"
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# only elf supported
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config KCORE_ELF
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bool
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depends on PROC_FS
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default y
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help
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If you enabled support for /proc file system then the file
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/proc/kcore will contain the kernel core image in ELF format. This
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can be used in gdb:
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$ cd /usr/src/linux ; gdb vmlinux /proc/kcore
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This is especially useful if you have compiled the kernel with the
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"-g" option to preserve debugging information. It is mainly used
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for examining kernel data structures on the live kernel.
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source "fs/Kconfig.binfmt"
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endmenu
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source "drivers/Kconfig"
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source "fs/Kconfig"
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menu "Xtensa initrd options"
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depends on BLK_DEV_INITRD
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config EMBEDDED_RAMDISK
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bool "Embed root filesystem ramdisk into the kernel"
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config EMBEDDED_RAMDISK_IMAGE
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string "Filename of gziped ramdisk image"
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depends on EMBEDDED_RAMDISK
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default "ramdisk.gz"
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help
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This is the filename of the ramdisk image to be built into the
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kernel. Relative pathnames are relative to arch/xtensa/boot/ramdisk/.
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The ramdisk image is not part of the kernel distribution; you must
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provide one yourself.
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endmenu
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source "arch/xtensa/Kconfig.debug"
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source "security/Kconfig"
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source "crypto/Kconfig"
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source "lib/Kconfig"
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@@ -0,0 +1,7 @@
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menu "Kernel hacking"
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source "lib/Kconfig.debug"
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endmenu
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@@ -0,0 +1,102 @@
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#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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# Copyright (C) 2001 - 2005 Tensilica Inc.
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#
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# This file is included by the global makefile so that you can add your own
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# architecture-specific flags and dependencies. Remember to do have actions
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# for "archclean" and "archdep" for cleaning up and making dependencies for
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# this architecture
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# Core configuration.
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# (Use CPU=<xtensa_config> to use another default compiler.)
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cpu-$(CONFIG_XTENSA_CPU_LINUX_BE) := linux_be
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cpu-$(CONFIG_XTENSA_CPU_LINUX_CUSTOM) := linux_custom
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CPU = $(cpu-y)
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export CPU
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# Platform configuration
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platform-y := common
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platform-$(CONFIG_XTENSA_PLATFORM_XT2000) := xt2000
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platform-$(CONFIG_XTENSA_PLATFORM_ISS) := iss
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PLATFORM = $(platform-y)
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export PLATFORM
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#LDFLAGS_vmlinux := -T$(word 1,$(LINKSCRIPT))
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AFLAGS_vmlinux.lds.o := -Uxtensa
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CPPFLAGS += -Iarch/xtensa -Iinclude/asm -mlongcalls -g
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AFLAGS += -Iarch/xtensa -Iinclude/asm
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CPP = $(CC) -E $(CFLAGS)
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cflags-y += -Iarch/xtensa -pipe -mlongcalls
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KBUILD_DEFCONFIG := common_defconfig
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# ramdisk/initrd support
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# You need a compressed ramdisk image, named ramdisk.gz in
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# arch/xtensa/boot/ramdisk
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core-$(CONFIG_EMBEDDED_RAMDISK) += arch/xtensa/boot/ramdisk/
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# Test for cross compiling
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ifneq ($(CPU),)
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COMPILE_ARCH = $(shell uname -m)
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ifneq ($(COMPILE_ARCH), xtensa)
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ifndef CROSS_COMPILE
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CROSS_COMPILE = xtensa_$(CPU)-
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endif
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endif
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endif
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#
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LIBGCC := $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)
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head-y := arch/xtensa/kernel/head.o
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core-y += arch/xtensa/kernel/ \
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arch/xtensa/mm/ arch/xtensa/platform-$(PLATFORM)/
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libs-y += arch/xtensa/lib/ $(LIBGCC)
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boot := arch/xtensa/boot
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arch/xtensa/kernel/asm-offsets.s: \
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arch/xtensa/kernel/asm-offsets.c \
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include/asm-xtensa/.platform
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include/asm-xtensa/offsets.h: arch/xtensa/kernel/asm-offsets.s
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$(call filechk,gen-asm-offsets)
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prepare: include/asm-xtensa/.platform include/asm-xtensa/offsets.h
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# Update machine cpu and platform symlinks if something which affects
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# them changed.
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include/asm-xtensa/.platform: $(wildcard include/config/arch/*.h)
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@echo ' Setting up cpu ($(CPU)) and platform ($(PLATFORM)) symlinks'
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$(Q)rm -f include/asm-xtensa/platform
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$(Q)rm -f include/asm-xtensa/xtensa/config
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$(Q)(cd include/asm-xtensa/; ln -sf platform-$(PLATFORM) platform)
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$(Q)(cd include/asm-xtensa/xtensa; ln -sf config-$(CPU) config)
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all: zImage
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bzImage : zImage
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zImage zImage.initrd: vmlinux
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$(Q)$(MAKE) $(build)=$(boot) $@
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CLEAN_FILES += arch/xtensa/vmlinux.lds include/asm-xtensa/offset.h
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define archhelp
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@echo '* zImage - Compressed kernel image (arch/xtensa/boot/images/zImage.*)'
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endef
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