Lkl fbsd

Documentation/lkl.txt

@@ -0,0 +1,80 @@
+
+Introduction
+------------
+
+LKL (Linux Kernel Library) is aiming to allow reusing the Linux kernel code as
+extensively as possible with minimal effort and reduced maintenance overhead.
+
+Examples of how LKL can be used are: creating userspace applications (running on
+Linux and other operating systems) that can read or write Linux filesystems or
+can use the Linux networking stack, creating kernel drivers for other operating
+systems that can read Linux filesystems, bootloaders support for reading/writing
+Linux filesystems, etc.
+
+With LKL, the kernel code is compiled into an object file that can be directly
+linked by applications. The API offered by LKL is based on the Linux system call
+interface.
+
+LKL is implemented as an architecture port in arch/lkl. It uses host operations
+defined by the application or a host library (tools/lkl/lib).
+
+
+Building LKL on FreeBSD
+-----------------------
+
+$ pkg install binutils gcc49
+
+If you don't have a gcc binary:
+$ ln -sf /usr/local/bin/gcc49 /usr/local/bin/gcc
+
+Prefer ports binutils:
+$ export PATH=/sbin:/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/usr/lib64/ccache
+
+$ cd tools/lkl
+$ gmake
+
+
+Building LKL the host library and LKL applications
+--------------------------------------------------
+
+% cd tools/lkl
+% make
+
+will build LKL as a object file, it will install it in tools/lkl/lib together
+with the headers files in tools/lkl/include then will build the host library,
+tests and a few of application examples:
+
+* tests/boot - a simple applications that uses LKL and exercises the basic LKL
+APIs
+
+* fs2tar - a tool that converts a filesystem image to a tar archive
+
+* cptofs/cpfromfs - a tool that copies files to/from a filesystem image
+
+
+Supported hosts
+---------------
+
+The supported hosts for now are POSIX and Windows userspace applications.
+
+FAQ
+---
+
+Q: How is LKL different from UML?
+
+A: UML prodivides a full OS environment (e.g. user/kernel separation, user
+processes) and also has requirements (a filesystem, processes, etc.) that makes
+it hard to use it for standalone applications. UML also relies heavily on Linux
+hosts. On the other hand LKL is designed to be linked directly with the
+application and hence does not have user/kernel separation which makes it easier
+to use it in standalone applications.
+
+
+Q: How is LKL different from LibOS?
+
+A: LibOS re-implements high-level kernel APIs for timers, softirqs, scheduling,
+sysctl, SLAB/SLUB, etc. LKL behaves like any arch port, implementing the arch
+level operations requested by the Linux kernel. LKL also offers a host interface
+so that support for multiple hosts can be implemented.
+
+

MAINTAINERS

@@ -6355,6 +6355,12 @@ F:	arch/powerpc/platforms/pasemi/
 F:	drivers/*/*pasemi*
 F:	drivers/*/*/*pasemi*
 
+LINUX KERNEL LIBRARY
+M:	Octavian Purdila <[email protected]>
+S:	Maintained
+F:	arch/lkl/
+F:	tools/lkl/
+
 LINUX SECURITY MODULE (LSM) FRAMEWORK
 M:	Chris Wright <[email protected]>
 L:	[email protected]

Makefile

@@ -554,6 +554,7 @@ endif # KBUILD_EXTMOD
 
 ifeq ($(dot-config),1)
 # Read in config
+-include arch/$(SRCARCH)/auto.conf
 -include include/config/auto.conf
 
 ifeq ($(KBUILD_EXTMOD),)

arch/lkl/.gitignore

@@ -0,0 +1 @@
+kernel/vmlinux.lds

arch/lkl/Kconfig

@@ -0,0 +1,84 @@
+config LKL
+       def_bool y
+       depends on !SMP && !MMU && !COREDUMP && !AUDITSYSCALL && !SECCOMP && !TRACEPOINTS && !UPROBES && !COMPAT && !USER_RETURN_NOTIFIER
+       select ARCH_THREAD_INFO_ALLOCATOR
+       select RWSEM_GENERIC_SPINLOCK
+       select GENERIC_ATOMIC64
+       select SEMAPHORE_SLEEPERS
+       select GENERIC_TIME
+       select GENERIC_FIND_NEXT_BIT
+       select GENERIC_HWEIGHT
+       select GENERIC_HARDIRQS
+       select FLATMEM
+       select FLAT_NODE_MEM_MAP
+       select GENERIC_CLOCKEVENTS
+       select GENERIC_CPU_DEVICES
+       select NO_HZ_IDLE
+       select NO_PREEMPT
+       select ARCH_WANT_FRAME_POINTERS
+       select PHYS_ADDR_T_64BIT if 64BIT
+       select 64BIT if OUTPUT_FORMAT = "elf64-x86-64"
+       select HAVE_UNDERSCORE_SYMBOL_PREFIX if OUTPUT_FORMAT = "pe-i386"
+       select 64BIT if OUTPUT_FORMAT = "elf64-x86-64-freebsd"
+
+config OUTPUTFORMAT
+       string
+       option env="OUTPUT_FORMAT"
+
+config OUTPUT_FORMAT
+       string "Output format"
+       default OUTPUTFORMAT
+
+config ARCH_DMA_ADDR_T_64BIT
+       def_bool 64BIT
+
+config 64BIT
+       def_bool n
+
+config BIG_ENDIAN
+       def_bool n
+
+config NO_DMA
+       def_bool y
+
+config GENERIC_CSUM
+       def_bool y
+
+config GENERIC_HWEIGHT
+       def_bool y
+
+config NO_IOPORT_MAP
+       def_bool y
+
+config RWSEM_GENERIC_SPINLOCK
+	bool
+	default y
+
+source init/Kconfig
+
+source net/Kconfig
+
+source drivers/base/Kconfig
+
+source drivers/virtio/Kconfig
+
+source drivers/block/Kconfig
+
+source fs/Kconfig
+
+source mm/Kconfig
+
+source kernel/Kconfig.preempt
+
+source kernel/Kconfig.locks
+
+source kernel/Kconfig.hz
+
+source security/Kconfig
+
+source crypto/Kconfig
+
+source lib/Kconfig
+
+source lib/Kconfig.debug
+

arch/lkl/Makefile

@@ -0,0 +1,47 @@
+include arch/lkl/auto.conf
+
+KBUILD_CFLAGS += -fno-builtin
+
+ifneq (,$(filter $(OUTPUT_FORMAT),elf64-x86-64 elf64-x86-64-freebsd))
+KBUILD_CFLAGS += -fPIC
+else ifeq ($(OUTPUT_FORMAT),pe-i386)
+prefix=_
+# workaround for #include_next<stdarg.h> errors
+LINUXINCLUDE := -isystem arch/lkl/include/system $(LINUXINCLUDE)
+else
+$(error Unrecognized platform: $(OUTPUT_FORMAT))
+endif
+
+ifneq (,$(filter $(OUTPUT_FORMAT),elf64-x86-64-freebsd))
+NPROC=$(shell sysctl -n hw.ncpu)
+else
+NPROC=$(shell nproc)
+endif
+
+LDFLAGS_vmlinux += -r
+LKL_ENTRY_POINTS := lkl_start_kernel lkl_sys_halt lkl_syscall lkl_trigger_irq \
+	lkl_get_free_irq lkl_put_irq
+
+core-y += arch/lkl/kernel/
+
+all: lkl.o
+
+lkl.o: vmlinux
+	$(OBJCOPY) $(foreach sym,$(LKL_ENTRY_POINTS),-G$(prefix)$(sym)) vmlinux lkl.o
+
+install: lkl.o __headers
+	@echo "  INSTALL	$(INSTALL_PATH)/lib/lkl.o"
+	@cp lkl.o $(INSTALL_PATH)/lib/
+	@arch/lkl/scripts/headers_install.py \
+		$(subst -j,-j$(NPROC),$(findstring -j,$(MAKEFLAGS))) \
+		$(INSTALL_PATH)/include
+
+archclean:
+	$(Q)$(MAKE) $(clean)=$(boot)
+
+define archhelp
+  echo '  install	- Install library and headers to INSTALL_PATH/{lib,include}'
+endef
+
+
+

arch/lkl/auto.conf

@@ -0,0 +1 @@
+export OUTPUT_FORMAT=$(shell $(LD) -r -print-output-format)

arch/lkl/defconfig

@@ -0,0 +1,35 @@
+# CONFIG_LOCALVERSION_AUTO is not set
+# CONFIG_USELIB is not set
+# CONFIG_SYSFS_SYSCALL is not set
+CONFIG_KALLSYMS_ALL=y
+# CONFIG_BASE_FULL is not set
+# CONFIG_FUTEX is not set
+# CONFIG_EPOLL is not set
+# CONFIG_SIGNALFD is not set
+# CONFIG_TIMERFD is not set
+# CONFIG_EVENTFD is not set
+# CONFIG_AIO is not set
+# CONFIG_ADVISE_SYSCALLS is not set
+CONFIG_EMBEDDED=y
+# CONFIG_VM_EVENT_COUNTERS is not set
+# CONFIG_COMPAT_BRK is not set
+# CONFIG_BLK_DEV_BSG is not set
+# CONFIG_UEVENT_HELPER is not set
+# CONFIG_FW_LOADER is not set
+CONFIG_VIRTIO_MMIO=y
+CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES=y
+CONFIG_VIRTIO_BLK=y
+CONFIG_EXT4_FS=y
+CONFIG_EXT4_FS_POSIX_ACL=y
+CONFIG_EXT4_FS_SECURITY=y
+# CONFIG_FILE_LOCKING is not set
+# CONFIG_DNOTIFY is not set
+# CONFIG_INOTIFY_USER is not set
+# CONFIG_MISC_FILESYSTEMS is not set
+CONFIG_CRYPTO_ANSI_CPRNG=y
+CONFIG_PRINTK_TIME=y
+CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_INFO_REDUCED=y
+# CONFIG_ENABLE_WARN_DEPRECATED is not set
+# CONFIG_ENABLE_MUST_CHECK is not set
+CONFIG_SLUB_DEBUG_ON=y

arch/lkl/include/asm/Kbuild

@@ -0,0 +1,77 @@
+generic-y += atomic.h
+generic-y += barrier.h
+generic-y += bitops.h
+generic-y += bug.h
+generic-y += bugs.h
+generic-y += cache.h
+generic-y += cacheflush.h
+generic-y += checksum.h
+generic-y += cmpxchg-local.h
+generic-y += cmpxchg.h
+generic-y += cputime.h
+generic-y += current.h
+generic-y += delay.h
+generic-y += device.h
+generic-y += div64.h
+generic-y += dma.h
+generic-y += emergency-restart.h
+generic-y += errno.h
+generic-y += exec.h
+generic-y += ftrace.h
+generic-y += futex.h
+generic-y += hardirq.h
+generic-y += hw_irq.h
+generic-y += ioctl.h
+generic-y += ipcbuf.h
+generic-y += irq_regs.h
+generic-y += irqflags.h
+generic-y += irq_work.h
+generic-y += kdebug.h
+generic-y += kmap_types.h
+generic-y += linkage.h
+generic-y += local.h
+generic-y += local64.h
+generic-y += mcs_spinlock.h
+generic-y += mmu.h
+generic-y += mmu_context.h
+generic-y += module.h
+generic-y += msgbuf.h
+generic-y += page.h
+generic-y += param.h
+generic-y += parport.h
+generic-y += pci.h
+generic-y += percpu.h
+generic-y += pgalloc.h
+generic-y += poll.h
+generic-y += preempt.h
+generic-y += resource.h
+generic-y += rwsem.h
+generic-y += scatterlist.h
+generic-y += seccomp.h
+generic-y += sections.h
+generic-y += segment.h
+generic-y += sembuf.h
+generic-y += serial.h
+generic-y += shmbuf.h
+generic-y += siginfo.h
+generic-y += signal.h
+generic-y += simd.h
+generic-y += sizes.h
+generic-y += socket.h
+generic-y += sockios.h
+generic-y += stat.h
+generic-y += statfs.h
+generic-y += string.h
+generic-y += swab.h
+generic-y += switch_to.h
+generic-y += termbits.h
+generic-y += termios.h
+generic-y += time.h
+generic-y += timex.h
+generic-y += tlb.h
+generic-y += tlbflush.h
+generic-y += topology.h
+generic-y += trace_clock.h
+generic-y += uaccess.h
+generic-y += unaligned.h
+generic-y += word-at-a-time.h

arch/lkl/include/asm/bitsperlong.h

@@ -0,0 +1,11 @@
+#ifndef __LKL_BITSPERLONG_H
+#define __LKL_BITSPERLONG_H
+
+#include <uapi/asm/bitsperlong.h>
+
+#define BITS_PER_LONG __BITS_PER_LONG
+
+#define BITS_PER_LONG_LONG 64
+
+#endif
+

arch/lkl/include/asm/byteorder.h

@@ -0,0 +1,10 @@
+#ifndef _ASM_LKL_BYTEORDER_H
+#define _ASM_LKL_BYTEORDER_H
+
+#if defined(CONFIG_BIG_ENDIAN)
+#include <linux/byteorder/big_endian.h>
+#else
+#include <linux/byteorder/little_endian.h>
+#endif
+
+#endif /* _ASM_LKL_BYTEORDER_H */

arch/lkl/include/asm/dma-mapping.h

@@ -0,0 +1,6 @@
+#ifndef _ASM_LKL_DMA_MAPPING_H
+#define _ASM_LKL_DMA_MAPPING_H
+
+#include <asm-generic/dma-mapping-broken.h>
+
+#endif

arch/lkl/include/asm/elf.h

@@ -0,0 +1,13 @@
+#ifndef _ASM_LKL_ELF_H
+#define _ASM_LKL_ELF_H
+
+#define elf_check_arch(x) 0
+
+#ifdef CONFIG_64BIT
+#define ELF_CLASS ELFCLASS64
+#else
+#define ELF_CLASS ELFCLASS32
+#endif
+
+#endif
+