提交 fbe934d6 编写于 作者: P Palmer Dabbelt

RISC-V: Build Infrastructure

This patch contains all the build infrastructure that actually enables
the RISC-V port.  This includes Makefiles, linker scripts, and Kconfig
files.  It also contains the only top-level change, which adds RISC-V to
the list of architectures that need a sed run to produce the ARCH
variable when building locally.
Signed-off-by: NPalmer Dabbelt <palmer@dabbelt.com>
上级 e2c0cdfb
......@@ -225,7 +225,8 @@ 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
# ---------------------------------------------------------------------------
......
#
# 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 || !RISCV_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 RISCV_ISA_A if SMP
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
select RISCV_TIMER
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 PAGE_OFFSET
hex
default 0xC0000000 if 32BIT && MAXPHYSMEM_2GB
default 0xffffffff80000000 if 64BIT && MAXPHYSMEM_2GB
default 0xffffffe000000000 if 64BIT && MAXPHYSMEM_128GB
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"
choice
prompt "Base ISA"
default ARCH_RV64I
help
This selects the base ISA that this kernel will traget and must match
the target platform.
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
# We must be able to map all physical memory into the kernel, but the compiler
# is still a bit more efficient when generating code if it's setup in a manner
# such that it can only map 2GiB of memory.
choice
prompt "Kernel Code Model"
default CMODEL_MEDLOW if 32BIT
default CMODEL_MEDANY if 64BIT
config CMODEL_MEDLOW
bool "medium low code model"
config CMODEL_MEDANY
bool "medium any code model"
endchoice
choice
prompt "Maximum Physical Memory"
default MAXPHYSMEM_2GB if 32BIT
default MAXPHYSMEM_2GB if 64BIT && CMODEL_MEDLOW
default MAXPHYSMEM_128GB if 64BIT && CMODEL_MEDANY
config MAXPHYSMEM_2GB
bool "2GiB"
config MAXPHYSMEM_128GB
depends on 64BIT && CMODEL_MEDANY
bool "128GiB"
endchoice
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 "CPU Tuning"
default TUNE_GENERIC
config TUNE_GENERIC
bool "generic"
endchoice
config RISCV_ISA_C
bool "Emit compressed instructions when building Linux"
default y
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 RISCV_ISA_A
def_bool 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"
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"
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
def_bool y
source "lib/Kconfig.debug"
config CMDLINE_BOOL
bool
endmenu
source "security/Kconfig"
source "crypto/Kconfig"
source "lib/Kconfig"
# 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 = 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 ($(CONFIG_RISCV_ISA_A),y)
KBUILD_ARCH_A = a
endif
ifeq ($(CONFIG_RISCV_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
KBUILD_CFLAGS += -DCONFIG_PAGE_OFFSET=$(CONFIG_PAGE_OFFSET)
ifeq ($(CONFIG_CMODEL_MEDLOW),y)
KBUILD_CFLAGS += -mcmodel=medlow
endif
ifeq ($(CONFIG_CMODEL_MEDANY),y)
KBUILD_CFLAGS += -mcmodel=medany
endif
# 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 += $(call cc-option,-mstrict-align)
head-y := arch/riscv/kernel/head.o
core-y += arch/riscv/kernel/ arch/riscv/mm/
libs-y += arch/riscv/lib/
all: vmlinux
generic-y += bugs.h
generic-y += cacheflush.h
generic-y += checksum.h
generic-y += clkdev.h
generic-y += cputime.h
generic-y += device.h
generic-y += div64.h
generic-y += dma.h
generic-y += dma-contiguous.h
generic-y += emergency-restart.h
generic-y += errno.h
generic-y += exec.h
generic-y += fb.h
generic-y += fcntl.h
generic-y += ftrace.h
generic-y += futex.h
generic-y += hardirq.h
generic-y += hash.h
generic-y += hw_irq.h
generic-y += ioctl.h
generic-y += ioctls.h
generic-y += ipcbuf.h
generic-y += irq_regs.h
generic-y += irq_work.h
generic-y += kdebug.h
generic-y += kmap_types.h
generic-y += kvm_para.h
generic-y += local.h
generic-y += mm-arch-hooks.h
generic-y += mman.h
generic-y += module.h
generic-y += msgbuf.h
generic-y += mutex.h
generic-y += param.h
generic-y += percpu.h
generic-y += poll.h
generic-y += posix_types.h
generic-y += preempt.h
generic-y += resource.h
generic-y += scatterlist.h
generic-y += sections.h
generic-y += sembuf.h
generic-y += setup.h
generic-y += shmbuf.h
generic-y += shmparam.h
generic-y += signal.h
generic-y += socket.h
generic-y += sockios.h
generic-y += stat.h
generic-y += statfs.h
generic-y += swab.h
generic-y += termbits.h
generic-y += termios.h
generic-y += topology.h
generic-y += trace_clock.h
generic-y += types.h
generic-y += unaligned.h
generic-y += user.h
generic-y += vga.h
generic-y += vmlinux.lds.h
generic-y += xor.h
#
# Makefile for the RISC-V Linux kernel
#
extra-y += head.o
extra-y += vmlinux.lds
obj-y += cpu.o
obj-y += cpufeature.o
obj-y += entry.o
obj-y += irq.o
obj-y += process.o
obj-y += ptrace.o
obj-y += reset.o
obj-y += setup.o
obj-y += signal.o
obj-y += syscall_table.o
obj-y += sys_riscv.o
obj-y += time.o
obj-y += traps.o
obj-y += riscv_ksyms.o
obj-y += stacktrace.o
obj-y += vdso.o
obj-y += cacheinfo.o
obj-y += vdso/
CFLAGS_setup.o := -mcmodel=medany
obj-$(CONFIG_SMP) += smpboot.o
obj-$(CONFIG_SMP) += smp.o
obj-$(CONFIG_MODULES) += module.o
clean:
/*
* Copyright (C) 2012 Regents of the University of California
* Copyright (C) 2017 SiFive
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#define LOAD_OFFSET PAGE_OFFSET
#include <asm/vmlinux.lds.h>
#include <asm/page.h>
#include <asm/cache.h>
#include <asm/thread_info.h>
OUTPUT_ARCH(riscv)
ENTRY(_start)
jiffies = jiffies_64;
SECTIONS
{
/* Beginning of code and text segment */
. = LOAD_OFFSET;
_start = .;
__init_begin = .;
HEAD_TEXT_SECTION
INIT_TEXT_SECTION(PAGE_SIZE)
INIT_DATA_SECTION(16)
/* we have to discard exit text and such at runtime, not link time */
.exit.text :
{
EXIT_TEXT
}
.exit.data :
{
EXIT_DATA
}
PERCPU_SECTION(L1_CACHE_BYTES)
__init_end = .;
.text : {
_text = .;
_stext = .;
TEXT_TEXT
SCHED_TEXT
CPUIDLE_TEXT
LOCK_TEXT
KPROBES_TEXT
ENTRY_TEXT
IRQENTRY_TEXT
*(.fixup)
_etext = .;
}
/* Start of data section */
_sdata = .;
RO_DATA_SECTION(L1_CACHE_BYTES)
.srodata : {
*(.srodata*)
}
RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
.sdata : {
__global_pointer$ = . + 0x800;
*(.sdata*)
/* End of data section */
_edata = .;
*(.sbss*)
}
BSS_SECTION(0, 0, 0)
EXCEPTION_TABLE(0x10)
NOTES
.rel.dyn : {
*(.rel.dyn*)
}
_end = .;
STABS_DEBUG
DWARF_DEBUG
DISCARDS
}
lib-y += delay.o
lib-y += memcpy.o
lib-y += memset.o
lib-y += uaccess.o
lib-$(CONFIG_32BIT) += udivdi3.o
obj-y += init.o
obj-y += fault.o
obj-y += extable.o
obj-y += ioremap.o
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