# SPDX-License-Identifier: GPL-2.0 config XTENSA def_bool y select ARCH_32BIT_OFF_T select ARCH_HAS_BINFMT_FLAT if !MMU select ARCH_HAS_DMA_PREP_COHERENT if MMU select ARCH_HAS_SYNC_DMA_FOR_CPU if MMU select ARCH_HAS_SYNC_DMA_FOR_DEVICE if MMU select ARCH_HAS_DMA_SET_UNCACHED if MMU select ARCH_HAS_STRNCPY_FROM_USER if !KASAN select ARCH_HAS_STRNLEN_USER select ARCH_USE_MEMTEST select ARCH_USE_QUEUED_RWLOCKS select ARCH_USE_QUEUED_SPINLOCKS select ARCH_WANT_FRAME_POINTERS select ARCH_WANT_IPC_PARSE_VERSION select BUILDTIME_TABLE_SORT select CLONE_BACKWARDS select COMMON_CLK select DMA_REMAP if MMU select GENERIC_ATOMIC64 select GENERIC_IRQ_SHOW select GENERIC_LIB_CMPDI2 select GENERIC_LIB_MULDI3 select GENERIC_LIB_UCMPDI2 select GENERIC_PCI_IOMAP select GENERIC_SCHED_CLOCK select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL select HAVE_ARCH_SECCOMP_FILTER select HAVE_ARCH_TRACEHOOK select HAVE_DEBUG_KMEMLEAK select HAVE_DMA_CONTIGUOUS select HAVE_EXIT_THREAD select HAVE_FUNCTION_TRACER select HAVE_HW_BREAKPOINT if PERF_EVENTS select HAVE_IRQ_TIME_ACCOUNTING select HAVE_PCI select HAVE_PERF_EVENTS select HAVE_STACKPROTECTOR select HAVE_SYSCALL_TRACEPOINTS select IRQ_DOMAIN select MODULES_USE_ELF_RELA select PERF_USE_VMALLOC select SET_FS select TRACE_IRQFLAGS_SUPPORT select VIRT_TO_BUS help Xtensa processors are 32-bit RISC machines designed by Tensilica primarily for embedded systems. These processors are both configurable and extensible. The Linux port to the Xtensa architecture supports all processor configurations and extensions, with reasonable minimum requirements. The Xtensa Linux project has a home page at . config GENERIC_HWEIGHT def_bool y config ARCH_HAS_ILOG2_U32 def_bool n config ARCH_HAS_ILOG2_U64 def_bool n config NO_IOPORT_MAP def_bool n config HZ int default 100 config LOCKDEP_SUPPORT def_bool y config STACKTRACE_SUPPORT def_bool y config MMU def_bool n config HAVE_XTENSA_GPIO32 def_bool n config KASAN_SHADOW_OFFSET hex default 0x6e400000 config CPU_BIG_ENDIAN def_bool $(success,test "$(shell,echo __XTENSA_EB__ | $(CC) -E -P -)" = 1) config CPU_LITTLE_ENDIAN def_bool !CPU_BIG_ENDIAN config CC_HAVE_CALL0_ABI def_bool $(success,test "$(shell,echo __XTENSA_CALL0_ABI__ | $(CC) -mabi=call0 -E -P - 2>/dev/null)" = 1) menu "Processor type and features" choice prompt "Xtensa Processor Configuration" default XTENSA_VARIANT_FSF config XTENSA_VARIANT_FSF bool "fsf - default (not generic) configuration" select MMU config XTENSA_VARIANT_DC232B bool "dc232b - Diamond 232L Standard Core Rev.B (LE)" select MMU select HAVE_XTENSA_GPIO32 help This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE). config XTENSA_VARIANT_DC233C bool "dc233c - Diamond 233L Standard Core Rev.C (LE)" select MMU select HAVE_XTENSA_GPIO32 help This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE). config XTENSA_VARIANT_CUSTOM bool "Custom Xtensa processor configuration" select HAVE_XTENSA_GPIO32 help Select this variant to use a custom Xtensa processor configuration. You will be prompted for a processor variant CORENAME. endchoice config XTENSA_VARIANT_CUSTOM_NAME string "Xtensa Processor Custom Core Variant Name" depends on XTENSA_VARIANT_CUSTOM help Provide the name of a custom Xtensa processor variant. This CORENAME selects arch/xtensa/variant/CORENAME. Don't forget you have to select MMU if you have one. config XTENSA_VARIANT_NAME string default "dc232b" if XTENSA_VARIANT_DC232B default "dc233c" if XTENSA_VARIANT_DC233C default "fsf" if XTENSA_VARIANT_FSF default XTENSA_VARIANT_CUSTOM_NAME if XTENSA_VARIANT_CUSTOM config XTENSA_VARIANT_MMU bool "Core variant has a Full MMU (TLB, Pages, Protection, etc)" depends on XTENSA_VARIANT_CUSTOM default y select MMU help Build a Conventional Kernel with full MMU support, ie: it supports a TLB with auto-loading, page protection. config XTENSA_VARIANT_HAVE_PERF_EVENTS bool "Core variant has Performance Monitor Module" depends on XTENSA_VARIANT_CUSTOM default n help Enable if core variant has Performance Monitor Module with External Registers Interface. If unsure, say N. config XTENSA_FAKE_NMI bool "Treat PMM IRQ as NMI" depends on XTENSA_VARIANT_HAVE_PERF_EVENTS default n help If PMM IRQ is the only IRQ at EXCM level it is safe to treat it as NMI, which improves accuracy of profiling. If there are other interrupts at or above PMM IRQ priority level but not above the EXCM level, PMM IRQ still may be treated as NMI, but only if these IRQs are not used. There will be a build warning saying that this is not safe, and a bugcheck if one of these IRQs actually fire. If unsure, say N. config XTENSA_UNALIGNED_USER bool "Unaligned memory access in user space" help The Xtensa architecture currently does not handle unaligned memory accesses in hardware but through an exception handler. Per default, unaligned memory accesses are disabled in user space. Say Y here to enable unaligned memory access in user space. config HAVE_SMP bool "System Supports SMP (MX)" depends on XTENSA_VARIANT_CUSTOM select XTENSA_MX help This option is used to indicate that the system-on-a-chip (SOC) supports Multiprocessing. Multiprocessor support implemented above the CPU core definition and currently needs to be selected manually. Multiprocessor support is implemented with external cache and interrupt controllers. The MX interrupt distributer adds Interprocessor Interrupts and causes the IRQ numbers to be increased by 4 for devices like the open cores ethernet driver and the serial interface. You still have to select "Enable SMP" to enable SMP on this SOC. config SMP bool "Enable Symmetric multi-processing support" depends on HAVE_SMP select GENERIC_SMP_IDLE_THREAD help Enabled SMP Software; allows more than one CPU/CORE to be activated during startup. config NR_CPUS depends on SMP int "Maximum number of CPUs (2-32)" range 2 32 default "4" config HOTPLUG_CPU bool "Enable CPU hotplug support" depends on SMP help Say Y here to allow turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu. Say N if you want to disable CPU hotplug. config FAST_SYSCALL_XTENSA bool "Enable fast atomic syscalls" default n help fast_syscall_xtensa is a syscall that can make atomic operations on UP kernel when processor has no s32c1i support. This syscall is deprecated. It may have issues when called with invalid arguments. It is provided only for backwards compatibility. Only enable it if your userspace software requires it. If unsure, say N. config FAST_SYSCALL_SPILL_REGISTERS bool "Enable spill registers syscall" default n help fast_syscall_spill_registers is a syscall that spills all active register windows of a calling userspace task onto its stack. This syscall is deprecated. It may have issues when called with invalid arguments. It is provided only for backwards compatibility. Only enable it if your userspace software requires it. If unsure, say N. choice prompt "Kernel ABI" default KERNEL_ABI_DEFAULT help Select ABI for the kernel code. This ABI is independent of the supported userspace ABI and any combination of the kernel/userspace ABI is possible and should work. In case both kernel and userspace support only call0 ABI all register windows support code will be omitted from the build. If unsure, choose the default ABI. config KERNEL_ABI_DEFAULT bool "Default ABI" help Select this option to compile kernel code with the default ABI selected for the toolchain. Normally cores with windowed registers option use windowed ABI and cores without it use call0 ABI. config KERNEL_ABI_CALL0 bool "Call0 ABI" if CC_HAVE_CALL0_ABI help Select this option to compile kernel code with call0 ABI even with toolchain that defaults to windowed ABI. When this option is not selected the default toolchain ABI will be used for the kernel code. endchoice config USER_ABI_CALL0 bool choice prompt "Userspace ABI" default USER_ABI_DEFAULT help Select supported userspace ABI. If unsure, choose the default ABI. config USER_ABI_DEFAULT bool "Default ABI only" help Assume default userspace ABI. For XEA2 cores it is windowed ABI. call0 ABI binaries may be run on such kernel, but signal delivery will not work correctly for them. config USER_ABI_CALL0_ONLY bool "Call0 ABI only" select USER_ABI_CALL0 help Select this option to support only call0 ABI in userspace. Windowed ABI binaries will crash with a segfault caused by an illegal instruction exception on the first 'entry' opcode. Choose this option if you're planning to run only user code built with call0 ABI. config USER_ABI_CALL0_PROBE bool "Support both windowed and call0 ABI by probing" select USER_ABI_CALL0 help Select this option to support both windowed and call0 userspace ABIs. When enabled all processes are started with PS.WOE disabled and a fast user exception handler for an illegal instruction is used to turn on PS.WOE bit on the first 'entry' opcode executed by the userspace. This option should be enabled for the kernel that must support both call0 and windowed ABIs in userspace at the same time. Note that Xtensa ISA does not guarantee that entry opcode will raise an illegal instruction exception on cores with XEA2 when PS.WOE is disabled, check whether the target core supports it. endchoice endmenu config XTENSA_CALIBRATE_CCOUNT def_bool n help On some platforms (XT2000, for example), the CPU clock rate can vary. The frequency can be determined, however, by measuring against a well known, fixed frequency, such as an UART oscillator. config SERIAL_CONSOLE def_bool n config PLATFORM_HAVE_XIP def_bool n menu "Platform options" choice prompt "Xtensa System Type" default XTENSA_PLATFORM_ISS config XTENSA_PLATFORM_ISS bool "ISS" select XTENSA_CALIBRATE_CCOUNT select SERIAL_CONSOLE help ISS is an acronym for Tensilica's Instruction Set Simulator. config XTENSA_PLATFORM_XT2000 bool "XT2000" help XT2000 is the name of Tensilica's feature-rich emulation platform. This hardware is capable of running a full Linux distribution. config XTENSA_PLATFORM_XTFPGA bool "XTFPGA" select ETHOC if ETHERNET select PLATFORM_WANT_DEFAULT_MEM if !MMU select SERIAL_CONSOLE select XTENSA_CALIBRATE_CCOUNT select PLATFORM_HAVE_XIP help XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605). This hardware is capable of running a full Linux distribution. endchoice config PLATFORM_NR_IRQS int default 3 if XTENSA_PLATFORM_XT2000 default 0 config XTENSA_CPU_CLOCK int "CPU clock rate [MHz]" depends on !XTENSA_CALIBRATE_CCOUNT default 16 config GENERIC_CALIBRATE_DELAY bool "Auto calibration of the BogoMIPS value" help The BogoMIPS value can easily be derived from the CPU frequency. config CMDLINE_BOOL bool "Default bootloader kernel arguments" config CMDLINE string "Initial kernel command string" depends on CMDLINE_BOOL default "console=ttyS0,38400 root=/dev/ram" help On some architectures (EBSA110 and CATS), there is currently no way for the boot loader to pass arguments to the kernel. For these architectures, you should supply some command-line options at build time by entering them here. As a minimum, you should specify the memory size and the root device (e.g., mem=64M root=/dev/nfs). config USE_OF bool "Flattened Device Tree support" select OF select OF_EARLY_FLATTREE help Include support for flattened device tree machine descriptions. config BUILTIN_DTB_SOURCE string "DTB to build into the kernel image" depends on OF config PARSE_BOOTPARAM bool "Parse bootparam block" default y help Parse parameters passed to the kernel from the bootloader. It may be disabled if the kernel is known to run without the bootloader. If unsure, say Y. choice prompt "Semihosting interface" default XTENSA_SIMCALL_ISS depends on XTENSA_PLATFORM_ISS help Choose semihosting interface that will be used for serial port, block device and networking. config XTENSA_SIMCALL_ISS bool "simcall" help Use simcall instruction. simcall is only available on simulators, it does nothing on hardware. config XTENSA_SIMCALL_GDBIO bool "GDBIO" help Use break instruction. It is available on real hardware when GDB is attached to it via JTAG. endchoice config BLK_DEV_SIMDISK tristate "Host file-based simulated block device support" default n depends on XTENSA_PLATFORM_ISS && BLOCK help Create block devices that map to files in the host file system. Device binding to host file may be changed at runtime via proc interface provided the device is not in use. config BLK_DEV_SIMDISK_COUNT int "Number of host file-based simulated block devices" range 1 10 depends on BLK_DEV_SIMDISK default 2 help This is the default minimal number of created block devices. Kernel/module parameter 'simdisk_count' may be used to change this value at runtime. More file names (but no more than 10) may be specified as parameters, simdisk_count grows accordingly. config SIMDISK0_FILENAME string "Host filename for the first simulated device" depends on BLK_DEV_SIMDISK = y default "" help Attach a first simdisk to a host file. Conventionally, this file contains a root file system. config SIMDISK1_FILENAME string "Host filename for the second simulated device" depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1 default "" help Another simulated disk in a host file for a buildroot-independent storage. config XTFPGA_LCD bool "Enable XTFPGA LCD driver" depends on XTENSA_PLATFORM_XTFPGA default n help There's a 2x16 LCD on most of XTFPGA boards, kernel may output progress messages there during bootup/shutdown. It may be useful during board bringup. If unsure, say N. config XTFPGA_LCD_BASE_ADDR hex "XTFPGA LCD base address" depends on XTFPGA_LCD default "0x0d0c0000" help Base address of the LCD controller inside KIO region. Different boards from XTFPGA family have LCD controller at different addresses. Please consult prototyping user guide for your board for the correct address. Wrong address here may lead to hardware lockup. config XTFPGA_LCD_8BIT_ACCESS bool "Use 8-bit access to XTFPGA LCD" depends on XTFPGA_LCD default n help LCD may be connected with 4- or 8-bit interface, 8-bit access may only be used with 8-bit interface. Please consult prototyping user guide for your board for the correct interface width. comment "Kernel memory layout" config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX bool "Initialize Xtensa MMU inside the Linux kernel code" depends on !XTENSA_VARIANT_FSF && !XTENSA_VARIANT_DC232B default y if XTENSA_VARIANT_DC233C || XTENSA_VARIANT_CUSTOM help Earlier version initialized the MMU in the exception vector before jumping to _startup in head.S and had an advantage that it was possible to place a software breakpoint at 'reset' and then enter your normal kernel breakpoints once the MMU was mapped to the kernel mappings (0XC0000000). This unfortunately won't work for U-Boot and likely also won't work for using KEXEC to have a hot kernel ready for doing a KDUMP. So now the MMU is initialized in head.S but it's necessary to use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup. xt-gdb can't place a Software Breakpoint in the 0XD region prior to mapping the MMU and after mapping even if the area of low memory was mapped gdb wouldn't remove the breakpoint on hitting it as the PC wouldn't match. Since Hardware Breakpoints are recommended for Linux configurations it seems reasonable to just assume they exist and leave this older mechanism for unfortunate souls that choose not to follow Tensilica's recommendation. Selecting this will cause U-Boot to set the KERNEL Load and Entry address at 0x00003000 instead of the mapped std of 0xD0003000. If in doubt, say Y. config XIP_KERNEL bool "Kernel Execute-In-Place from ROM" depends on PLATFORM_HAVE_XIP help Execute-In-Place allows the kernel to run from non-volatile storage directly addressable by the CPU, such as NOR flash. This saves RAM space since the text section of the kernel is not loaded from flash to RAM. Read-write sections, such as the data section and stack, are still copied to RAM. The XIP kernel is not compressed since it has to run directly from flash, so it will take more space to store it. The flash address used to link the kernel object files, and for storing it, is configuration dependent. Therefore, if you say Y here, you must know the proper physical address where to store the kernel image depending on your own flash memory usage. Also note that the make target becomes "make xipImage" rather than "make Image" or "make uImage". The final kernel binary to put in ROM memory will be arch/xtensa/boot/xipImage. If unsure, say N. config MEMMAP_CACHEATTR hex "Cache attributes for the memory address space" depends on !MMU default 0x22222222 help These cache attributes are set up for noMMU systems. Each hex digit specifies cache attributes for the corresponding 512MB memory region: bits 0..3 -- for addresses 0x00000000..0x1fffffff, bits 4..7 -- for addresses 0x20000000..0x3fffffff, and so on. Cache attribute values are specific for the MMU type. For region protection MMUs: 1: WT cached, 2: cache bypass, 4: WB cached, f: illegal. For full MMU: bit 0: executable, bit 1: writable, bits 2..3: 0: cache bypass, 1: WB cache, 2: WT cache, 3: special (c and e are illegal, f is reserved). For MPU: 0: illegal, 1: WB cache, 2: WB, no-write-allocate cache, 3: WT cache, 4: cache bypass. config KSEG_PADDR hex "Physical address of the KSEG mapping" depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX && MMU default 0x00000000 help This is the physical address where KSEG is mapped. Please refer to the chosen KSEG layout help for the required address alignment. Unpacked kernel image (including vectors) must be located completely within KSEG. Physical memory below this address is not available to linux. If unsure, leave the default value here. config KERNEL_VIRTUAL_ADDRESS hex "Kernel virtual address" depends on MMU && XIP_KERNEL default 0xd0003000 help This is the virtual address where the XIP kernel is mapped. XIP kernel may be mapped into KSEG or KIO region, virtual address provided here must match kernel load address provided in KERNEL_LOAD_ADDRESS. config KERNEL_LOAD_ADDRESS hex "Kernel load address" default 0x60003000 if !MMU default 0x00003000 if MMU && INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX default 0xd0003000 if MMU && !INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX help This is the address where the kernel is loaded. It is virtual address for MMUv2 configurations and physical address for all other configurations. If unsure, leave the default value here. choice prompt "Relocatable vectors location" default XTENSA_VECTORS_IN_TEXT help Choose whether relocatable vectors are merged into the kernel .text or placed separately at runtime. This option does not affect configurations without VECBASE register where vectors are always placed at their hardware-defined locations. config XTENSA_VECTORS_IN_TEXT bool "Merge relocatable vectors into kernel text" depends on !MTD_XIP help This option puts relocatable vectors into the kernel .text section with proper alignment. This is a safe choice for most configurations. config XTENSA_VECTORS_SEPARATE bool "Put relocatable vectors at fixed address" help This option puts relocatable vectors at specific virtual address. Vectors are merged with the .init data in the kernel image and are copied into their designated location during kernel startup. Use it to put vectors into IRAM or out of FLASH on kernels with XIP-aware MTD support. endchoice config VECTORS_ADDR hex "Kernel vectors virtual address" default 0x00000000 depends on XTENSA_VECTORS_SEPARATE help This is the virtual address of the (relocatable) vectors base. It must be within KSEG if MMU is used. config XIP_DATA_ADDR hex "XIP kernel data virtual address" depends on XIP_KERNEL default 0x00000000 help This is the virtual address where XIP kernel data is copied. It must be within KSEG if MMU is used. config PLATFORM_WANT_DEFAULT_MEM def_bool n config DEFAULT_MEM_START hex prompt "PAGE_OFFSET/PHYS_OFFSET" if !MMU && PLATFORM_WANT_DEFAULT_MEM default 0x60000000 if PLATFORM_WANT_DEFAULT_MEM default 0x00000000 help This is the base address used for both PAGE_OFFSET and PHYS_OFFSET in noMMU configurations. If unsure, leave the default value here. choice prompt "KSEG layout" depends on MMU default XTENSA_KSEG_MMU_V2 config XTENSA_KSEG_MMU_V2 bool "MMUv2: 128MB cached + 128MB uncached" help MMUv2 compatible kernel memory map: TLB way 5 maps 128MB starting at KSEG_PADDR to 0xd0000000 with cache and to 0xd8000000 without cache. KSEG_PADDR must be aligned to 128MB. config XTENSA_KSEG_256M bool "256MB cached + 256MB uncached" depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX help TLB way 6 maps 256MB starting at KSEG_PADDR to 0xb0000000 with cache and to 0xc0000000 without cache. KSEG_PADDR must be aligned to 256MB. config XTENSA_KSEG_512M bool "512MB cached + 512MB uncached" depends on INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX help TLB way 6 maps 512MB starting at KSEG_PADDR to 0xa0000000 with cache and to 0xc0000000 without cache. KSEG_PADDR must be aligned to 256MB. endchoice config HIGHMEM bool "High Memory Support" depends on MMU select KMAP_LOCAL help Linux can use the full amount of RAM in the system by default. However, the default MMUv2 setup only maps the lowermost 128 MB of memory linearly to the areas starting at 0xd0000000 (cached) and 0xd8000000 (uncached). When there are more than 128 MB memory in the system not all of it can be "permanently mapped" by the kernel. The physical memory that's not permanently mapped is called "high memory". If you are compiling a kernel which will never run on a machine with more than 128 MB total physical RAM, answer N here. If unsure, say Y. config FORCE_MAX_ZONEORDER int "Maximum zone order" default "11" help The kernel memory allocator divides physically contiguous memory blocks into "zones", where each zone is a power of two number of pages. This option selects the largest power of two that the kernel keeps in the memory allocator. If you need to allocate very large blocks of physically contiguous memory, then you may need to increase this value. This config option is actually maximum order plus one. For example, a value of 11 means that the largest free memory block is 2^10 pages. endmenu menu "Power management options" source "kernel/power/Kconfig" endmenu