This patch adds RISC-V support to the build infastructure. Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxx> --- Makefile | 3 +- arch/riscv/Kconfig | 318 ++++++++++++++++++++++++++++++ arch/riscv/Makefile | 64 ++++++ arch/riscv/configs/freedom-u500_defconfig | 53 +++++ arch/riscv/configs/spike32_defconfig | 50 +++++ arch/riscv/configs/spike64_defconfig | 46 +++++ 6 files changed, 533 insertions(+), 1 deletion(-) create mode 100644 arch/riscv/Kconfig create mode 100644 arch/riscv/Makefile create mode 100644 arch/riscv/configs/freedom-u500_defconfig create mode 100644 arch/riscv/configs/spike32_defconfig create mode 100644 arch/riscv/configs/spike64_defconfig diff --git a/Makefile b/Makefile index 853ae9179af9..88711cbcc3ca 100644 --- a/Makefile +++ b/Makefile @@ -232,7 +232,8 @@ SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_64/x86/ \ -e s/arm.*/arm/ -e s/sa110/arm/ \ -e s/s390x/s390/ -e s/parisc64/parisc/ \ -e s/ppc.*/powerpc/ -e s/mips.*/mips/ \ - -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ ) + -e s/sh[234].*/sh/ -e s/aarch64.*/arm64/ \ + -e s/riscv.*/riscv/) # Cross compiling and selecting different set of gcc/bin-utils # --------------------------------------------------------------------------- diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig new file mode 100644 index 000000000000..64fcb17886c6 --- /dev/null +++ b/arch/riscv/Kconfig @@ -0,0 +1,318 @@ +# +# For a description of the syntax of this configuration file, +# see Documentation/kbuild/kconfig-language.txt. +# + +config RISCV + def_bool y + select OF + select OF_EARLY_FLATTREE + select OF_IRQ + select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE + select ARCH_WANT_FRAME_POINTERS + select CLONE_BACKWARDS + select COMMON_CLK + select GENERIC_CLOCKEVENTS + select GENERIC_CPU_DEVICES + select GENERIC_IRQ_SHOW + select GENERIC_PCI_IOMAP + select GENERIC_STRNCPY_FROM_USER + select GENERIC_STRNLEN_USER + select GENERIC_SMP_IDLE_THREAD + select GENERIC_ATOMIC64 if !64BIT || !ISA_A + select ARCH_WANT_OPTIONAL_GPIOLIB + select HAVE_MEMBLOCK + select HAVE_DMA_API_DEBUG + select HAVE_DMA_CONTIGUOUS + select HAVE_GENERIC_DMA_COHERENT + select IRQ_DOMAIN + select NO_BOOTMEM + select ISA_A if SMP + select SYSRISCV_ATOMIC if !ISA_A + select SPARSE_IRQ + select SYSCTL_EXCEPTION_TRACE + select HAVE_ARCH_TRACEHOOK + select MODULES_USE_ELF_RELA if MODULES + select THREAD_INFO_IN_TASK + select RISCV_IRQ_INTC + +config MMU + def_bool y + +# even on 32-bit, physical (and DMA) addresses are > 32-bits +config ARCH_PHYS_ADDR_T_64BIT + def_bool y + +config ARCH_DMA_ADDR_T_64BIT + def_bool y + +config STACKTRACE_SUPPORT + def_bool y + +config RWSEM_GENERIC_SPINLOCK + def_bool y + +config GENERIC_BUG + def_bool y + depends on BUG + select GENERIC_BUG_RELATIVE_POINTERS if 64BIT + +config GENERIC_BUG_RELATIVE_POINTERS + bool + +config GENERIC_CALIBRATE_DELAY + def_bool y + +config GENERIC_CSUM + def_bool y + +config GENERIC_HWEIGHT + def_bool y + +config PGTABLE_LEVELS + int + default 3 if 64BIT + default 2 + +config HAVE_KPROBES + def_bool n + +config DMA_NOOP_OPS + def_bool y + +menu "Platform type" + +config SMP + bool "Symmetric Multi-Processing" + help + This enables support for systems with more than one CPU. If + you say N here, the kernel will run on single and + multiprocessor machines, but will use only one CPU of a + multiprocessor machine. If you say Y here, the kernel will run + on many, but not all, single processor machines. On a single + processor machine, the kernel will run faster if you say N + here. + + If you don't know what to do here, say N. + +config NR_CPUS + int "Maximum number of CPUs (2-32)" + range 2 32 + depends on SMP + default "8" + +config CPU_SUPPORTS_32BIT_KERNEL + bool +config CPU_SUPPORTS_64BIT_KERNEL + bool + +choice + prompt "Base ISA" + default ARCH_RV64I + +config ARCH_RV32I + bool "RV32I" + select CPU_SUPPORTS_32BIT_KERNEL + select 32BIT + select GENERIC_ASHLDI3 + select GENERIC_ASHRDI3 + select GENERIC_LSHRDI3 + +config ARCH_RV64I + bool "RV64I" + select CPU_SUPPORTS_64BIT_KERNEL + select 64BIT + +endchoice + +choice + prompt "CPU Tuning" + default TUNE_GENERIC + +config TUNE_GENERIC + bool "generic" + +endchoice + +config ISA_C + bool "Emit compressed instructions when building Linux" + default n + help + Adds "C" to the ISA subsets that the toolchain is allowed to emit + when building Linux, which results in compressed instructions in the + Linux binary. + + If you don't know what to do here, say Y. + +config ISA_A + bool "Emit atomic instructions when building Linux" + default y + help + Adds "A" to the ISA subsets that the toolchain is allowed to emit + when building Linux, which results in atomic instructions in the + Linux binary. + + If you don't know what to do here, say Y. + +config SYSRISCV_ATOMIC + bool "Include support for atomic operation syscalls" + default !ISA_A + help + If atomic memory instructions are present, i.e., + CONFIG_ISA_A, this includes support for the syscall that + provides atomic accesses. This is only useful to run + binaries that require atomic access but were compiled with + -mno-atomic. + + If CONFIG_ISA_A is unset, this option is mandatory. + + If you don't know what to do here, say N. + +config RV_PUM + def_bool y + prompt "Protect User Memory" if EXPERT + ---help--- + Protect User Memory (PUM) prevents the kernel from inadvertently + accessing user-space memory. There is a small performance cost + and kernel size increase if this is enabled. + + If unsure, say Y. + +endmenu + +menu "Kernel type" + +choice + prompt "Kernel code model" + default 64BIT + +config 32BIT + bool "32-bit kernel" + depends on CPU_SUPPORTS_32BIT_KERNEL + help + Select this option to build a 32-bit kernel. + +config 64BIT + bool "64-bit kernel" + depends on CPU_SUPPORTS_64BIT_KERNEL + help + Select this option to build a 64-bit kernel. + +endchoice + +source "mm/Kconfig" + +source "kernel/Kconfig.preempt" + +source "kernel/Kconfig.hz" + +endmenu + +menu "Bus support" + +config PCI + bool "PCI support" + select PCI_MSI + help + This feature enables support for PCI bus system. If you say Y + here, the kernel will include drivers and infrastructure code + to support PCI bus devices. + + If you don't know what to do here, say Y. + +config PCI_DOMAINS + def_bool PCI + +config PCI_DOMAINS_GENERIC + def_bool PCI + +source "drivers/pci/Kconfig" + +endmenu + +source "init/Kconfig" + +source "kernel/Kconfig.freezer" + +menu "Executable file formats" + +source "fs/Kconfig.binfmt" + +endmenu + +menu "Power management options" + +source kernel/power/Kconfig + +endmenu + +source "net/Kconfig" + +source "drivers/Kconfig" + +source "fs/Kconfig" + +menu "Kernel hacking" + +config CMDLINE_BOOL + bool "Built-in kernel command line" + default n + help + For most platforms, it is firmware or second stage bootloader + that by default specifies the kernel command line options. + However, it might be necessary or advantageous to either override + the default kernel command line or add a few extra options to it. + For such cases, this option allows hardcoding command line options + directly into the kernel. + + For that, choose 'Y' here and fill in the extra boot parameters + in CONFIG_CMDLINE. + + The built-in options will be concatenated to the default command + line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default + command line will be ignored and replaced by the built-in string. + +config CMDLINE + string "Built-in kernel command string" + depends on CMDLINE_BOOL + default "" + help + Supply command-line options at build time by entering them here. + +config CMDLINE_OVERRIDE + bool "Built-in command line overrides bootloader arguments" + default n + depends on CMDLINE_BOOL + help + Set this option to 'Y' to have the kernel ignore the bootloader + or firmware command line. Instead, the built-in command line + will be used exclusively. + + If you don't know what to do here, say N. + +config EARLY_PRINTK + bool "Early printk" + default n + help + This option enables special console drivers which allow the kernel + to print messages very early in the bootup process. + + This is useful for kernel debugging when your machine crashes very + early before the console code is initialized. For normal operation + it is not recommended because it looks ugly and doesn't cooperate + with klogd/syslogd or the X server. You should normally N here, + unless you want to debug such a crash. + + +source "lib/Kconfig.debug" + +config CMDLINE_BOOL + bool +endmenu + +source "security/Kconfig" + +source "crypto/Kconfig" + +source "lib/Kconfig" + diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile new file mode 100644 index 000000000000..66c4a5e383f9 --- /dev/null +++ b/arch/riscv/Makefile @@ -0,0 +1,64 @@ +# This file is included by the global makefile so that you can add your own +# architecture-specific flags and dependencies. Remember to do have actions +# for "archclean" and "archdep" for cleaning up and making dependencies for +# this architecture +# +# This file is subject to the terms and conditions of the GNU General Public +# License. See the file "COPYING" in the main directory of this archive +# for more details. +# + +LDFLAGS := +OBJCOPYFLAGS := -O binary +LDFLAGS_vmlinux := +KBUILD_AFLAGS_MODULE += -fPIC +KBUILD_CFLAGS_MODULE += -fPIC + +KBUILD_DEFCONFIG = spike64_defconfig + +export BITS +ifeq ($(CONFIG_ARCH_RV64I),y) + BITS := 64 + UTS_MACHINE := riscv64 + + KBUILD_CFLAGS += -mabi=lp64 + KBUILD_AFLAGS += -mabi=lp64 + KBUILD_MARCH = rv64im + LDFLAGS += -melf64lriscv +else + BITS := 32 + UTS_MACHINE := riscv32 + + KBUILD_CFLAGS += -mabi=ilp32 + KBUILD_AFLAGS += -mabi=ilp32 + KBUILD_MARCH = rv32im + LDFLAGS += -melf32lriscv +endif + +KBUILD_CFLAGS += -Wall + +ifeq ($(CONFIG_ISA_A),y) + KBUILD_ARCH_A = a +endif +ifeq ($(CONFIG_ISA_C),y) + KBUILD_ARCH_C = c +endif + +KBUILD_AFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)fd$(KBUILD_ARCH_C) + +KBUILD_CFLAGS += -march=$(KBUILD_MARCH)$(KBUILD_ARCH_A)$(KBUILD_ARCH_C) +KBUILD_CFLAGS += -mno-save-restore + +# GCC versions that support the "-mstrict-align" option default to allowing +# unaligned accesses. While unaligned accesses are explicitly allowed in the +# RISC-V ISA, they're emulated by machine mode traps on all extant +# architectures. It's faster to have GCC emit only aligned accesses. +KBUILD_CFLAGS += $(call cc-option,-mstrict-align) + +head-y := arch/riscv/kernel/head.o + +core-y += arch/riscv/kernel/ arch/riscv/mm/ + +libs-y += arch/riscv/lib/ + +all: vmlinux diff --git a/arch/riscv/configs/freedom-u500_defconfig b/arch/riscv/configs/freedom-u500_defconfig new file mode 100644 index 000000000000..b37908d45067 --- /dev/null +++ b/arch/riscv/configs/freedom-u500_defconfig @@ -0,0 +1,53 @@ +CONFIG_CROSS_COMPILE="riscv64-unknown-linux-gnu-" +CONFIG_DEFAULT_HOSTNAME="ucbvax" +# CONFIG_CROSS_MEMORY_ATTACH is not set +# CONFIG_FHANDLE is not set +CONFIG_NAMESPACES=y +# CONFIG_SGETMASK_SYSCALL is not set +CONFIG_EMBEDDED=y +# CONFIG_BLK_DEV_BSG is not set +CONFIG_PARTITION_ADVANCED=y +# CONFIG_EFI_PARTITION is not set +# CONFIG_IOSCHED_DEADLINE is not set +# CONFIG_COMPACTION is not set +CONFIG_HZ_100=y +CONFIG_PCI_MSI=y +CONFIG_NET=y +CONFIG_UNIX=y +CONFIG_INET=y +# CONFIG_INET_XFRM_MODE_TRANSPORT is not set +# CONFIG_INET_XFRM_MODE_TUNNEL is not set +# CONFIG_INET_XFRM_MODE_BEET is not set +# CONFIG_INET_DIAG is not set +# CONFIG_IPV6 is not set +# CONFIG_WIRELESS is not set +CONFIG_DEVTMPFS=y +CONFIG_DEVTMPFS_MOUNT=y +# CONFIG_FIRMWARE_IN_KERNEL is not set +CONFIG_OF=y +# CONFIG_BLK_DEV is not set +# CONFIG_INPUT_KEYBOARD is not set +# CONFIG_INPUT_MOUSE is not set +# CONFIG_VT is not set +CONFIG_DEVKMEM=y +# CONFIG_HW_RANDOM is not set +# CONFIG_HWMON is not set +CONFIG_FB=y +# CONFIG_USB_SUPPORT is not set +# CONFIG_IOMMU_SUPPORT is not set +CONFIG_EXT2_FS=y +# CONFIG_FILE_LOCKING is not set +# CONFIG_DNOTIFY is not set +# CONFIG_INOTIFY_USER is not set +# CONFIG_PROC_PAGE_MONITOR is not set +# CONFIG_SYSFS is not set +CONFIG_TMPFS=y +# CONFIG_MISC_FILESYSTEMS is not set +# CONFIG_NETWORK_FILESYSTEMS is not set +CONFIG_PRINTK_TIME=y +# CONFIG_UNUSED_SYMBOLS is not set +CONFIG_DEBUG_SECTION_MISMATCH=y +# CONFIG_FRAME_POINTER is not set +# CONFIG_EARLY_PRINTK is not set +# CONFIG_CRYPTO_HW is not set +CONFIG_TTY=y diff --git a/arch/riscv/configs/spike32_defconfig b/arch/riscv/configs/spike32_defconfig new file mode 100644 index 000000000000..cf3431e94311 --- /dev/null +++ b/arch/riscv/configs/spike32_defconfig @@ -0,0 +1,50 @@ +CONFIG_64BIT=n +CONFIG_32BIT=y +CONFIG_ARCH_RV64I=n +CONFIG_ARCH_RV32I=y +CONFIG_PCI=y +CONFIG_DEFAULT_HOSTNAME="ucbvax" +# CONFIG_CROSS_MEMORY_ATTACH is not set +# CONFIG_FHANDLE is not set +CONFIG_NAMESPACES=y +CONFIG_EMBEDDED=y +# CONFIG_BLK_DEV_BSG is not set +CONFIG_PARTITION_ADVANCED=y +# CONFIG_EFI_PARTITION is not set +# CONFIG_IOSCHED_DEADLINE is not set +CONFIG_NET=y +CONFIG_UNIX=y +CONFIG_INET=y +# CONFIG_INET_XFRM_MODE_TRANSPORT is not set +# CONFIG_INET_XFRM_MODE_TUNNEL is not set +# CONFIG_INET_XFRM_MODE_BEET is not set +# CONFIG_INET_DIAG is not set +# CONFIG_IPV6 is not set +# CONFIG_WIRELESS is not set +CONFIG_DEVTMPFS=y +CONFIG_DEVTMPFS_MOUNT=y +# CONFIG_FIRMWARE_IN_KERNEL is not set +# CONFIG_BLK_DEV is not set +# CONFIG_INPUT_KEYBOARD is not set +# CONFIG_INPUT_MOUSE is not set +# CONFIG_VT is not set +CONFIG_DEVKMEM=y +# CONFIG_HW_RANDOM is not set +# CONFIG_HWMON is not set +CONFIG_FB=y +# CONFIG_USB_SUPPORT is not set +# CONFIG_IOMMU_SUPPORT is not set +CONFIG_EXT2_FS=y +# CONFIG_FILE_LOCKING is not set +# CONFIG_DNOTIFY is not set +# CONFIG_INOTIFY_USER is not set +# CONFIG_PROC_PAGE_MONITOR is not set +# CONFIG_SYSFS is not set +CONFIG_TMPFS=y +# CONFIG_MISC_FILESYSTEMS is not set +# CONFIG_NETWORK_FILESYSTEMS is not set +CONFIG_PRINTK_TIME=y +CONFIG_DEBUG_SECTION_MISMATCH=y +# CONFIG_FRAME_POINTER is not set +# CONFIG_CRYPTO_HW is not set +CONFIG_TTY=y diff --git a/arch/riscv/configs/spike64_defconfig b/arch/riscv/configs/spike64_defconfig new file mode 100644 index 000000000000..5ad6644df541 --- /dev/null +++ b/arch/riscv/configs/spike64_defconfig @@ -0,0 +1,46 @@ +CONFIG_PCI=y +CONFIG_DEFAULT_HOSTNAME="ucbvax" +# CONFIG_CROSS_MEMORY_ATTACH is not set +# CONFIG_FHANDLE is not set +CONFIG_NAMESPACES=y +CONFIG_EMBEDDED=y +# CONFIG_BLK_DEV_BSG is not set +CONFIG_PARTITION_ADVANCED=y +# CONFIG_EFI_PARTITION is not set +# CONFIG_IOSCHED_DEADLINE is not set +CONFIG_NET=y +CONFIG_UNIX=y +CONFIG_INET=y +# CONFIG_INET_XFRM_MODE_TRANSPORT is not set +# CONFIG_INET_XFRM_MODE_TUNNEL is not set +# CONFIG_INET_XFRM_MODE_BEET is not set +# CONFIG_INET_DIAG is not set +# CONFIG_IPV6 is not set +# CONFIG_WIRELESS is not set +CONFIG_DEVTMPFS=y +CONFIG_DEVTMPFS_MOUNT=y +# CONFIG_FIRMWARE_IN_KERNEL is not set +# CONFIG_BLK_DEV is not set +# CONFIG_INPUT_KEYBOARD is not set +# CONFIG_INPUT_MOUSE is not set +# CONFIG_VT is not set +CONFIG_DEVKMEM=y +# CONFIG_HW_RANDOM is not set +# CONFIG_HWMON is not set +CONFIG_FB=y +# CONFIG_USB_SUPPORT is not set +# CONFIG_IOMMU_SUPPORT is not set +CONFIG_EXT2_FS=y +# CONFIG_FILE_LOCKING is not set +# CONFIG_DNOTIFY is not set +# CONFIG_INOTIFY_USER is not set +# CONFIG_PROC_PAGE_MONITOR is not set +# CONFIG_SYSFS is not set +CONFIG_TMPFS=y +# CONFIG_MISC_FILESYSTEMS is not set +# CONFIG_NETWORK_FILESYSTEMS is not set +CONFIG_PRINTK_TIME=y +CONFIG_DEBUG_SECTION_MISMATCH=y +# CONFIG_FRAME_POINTER is not set +# CONFIG_CRYPTO_HW is not set +CONFIG_TTY=y -- 2.13.0
