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-rw-r--r--usr/.gitignore4
-rw-r--r--usr/Kconfig229
-rw-r--r--usr/Makefile85
-rw-r--r--usr/default_cpio_list6
-rw-r--r--usr/dummy-include/stdbool.h7
-rw-r--r--usr/dummy-include/stdlib.h7
-rw-r--r--usr/gen_init_cpio.c688
-rwxr-xr-xusr/gen_initramfs.sh249
-rw-r--r--usr/include/.gitignore2
-rw-r--r--usr/include/Makefile95
-rwxr-xr-xusr/include/headers_check.pl171
-rw-r--r--usr/initramfs_data.S36
12 files changed, 1579 insertions, 0 deletions
diff --git a/usr/.gitignore b/usr/.gitignore
new file mode 100644
index 0000000000..8996e7a889
--- /dev/null
+++ b/usr/.gitignore
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
+/gen_init_cpio
+/initramfs_data.cpio
+/initramfs_inc_data
diff --git a/usr/Kconfig b/usr/Kconfig
new file mode 100644
index 0000000000..8bbcf699fe
--- /dev/null
+++ b/usr/Kconfig
@@ -0,0 +1,229 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Configuration for initramfs
+#
+
+config INITRAMFS_SOURCE
+ string "Initramfs source file(s)"
+ default ""
+ help
+ This can be either a single cpio archive with a .cpio suffix or a
+ space-separated list of directories and files for building the
+ initramfs image. A cpio archive should contain a filesystem archive
+ to be used as an initramfs image. Directories should contain a
+ filesystem layout to be included in the initramfs image. Files
+ should contain entries according to the format described by the
+ "usr/gen_init_cpio" program in the kernel tree.
+
+ When multiple directories and files are specified then the
+ initramfs image will be the aggregate of all of them.
+
+ See <file:Documentation/driver-api/early-userspace/early_userspace_support.rst> for more details.
+
+ If you are not sure, leave it blank.
+
+config INITRAMFS_FORCE
+ bool "Ignore the initramfs passed by the bootloader"
+ depends on CMDLINE_EXTEND || CMDLINE_FORCE
+ help
+ This option causes the kernel to ignore the initramfs image
+ (or initrd image) passed to it by the bootloader. This is
+ analogous to CMDLINE_FORCE, which is found on some architectures,
+ and is useful if you cannot or don't want to change the image
+ your bootloader passes to the kernel.
+
+config INITRAMFS_ROOT_UID
+ int "User ID to map to 0 (user root)"
+ depends on INITRAMFS_SOURCE!=""
+ default "0"
+ help
+ If INITRAMFS_SOURCE points to a directory, files owned by this UID
+ (-1 = current user) will be owned by root in the resulting image.
+
+ If you are not sure, leave it set to "0".
+
+config INITRAMFS_ROOT_GID
+ int "Group ID to map to 0 (group root)"
+ depends on INITRAMFS_SOURCE!=""
+ default "0"
+ help
+ If INITRAMFS_SOURCE points to a directory, files owned by this GID
+ (-1 = current group) will be owned by root in the resulting image.
+
+ If you are not sure, leave it set to "0".
+
+config RD_GZIP
+ bool "Support initial ramdisk/ramfs compressed using gzip"
+ default y
+ select DECOMPRESS_GZIP
+ help
+ Support loading of a gzip encoded initial ramdisk or cpio buffer.
+ If unsure, say Y.
+
+config RD_BZIP2
+ bool "Support initial ramdisk/ramfs compressed using bzip2"
+ default y
+ select DECOMPRESS_BZIP2
+ help
+ Support loading of a bzip2 encoded initial ramdisk or cpio buffer
+ If unsure, say N.
+
+config RD_LZMA
+ bool "Support initial ramdisk/ramfs compressed using LZMA"
+ default y
+ select DECOMPRESS_LZMA
+ help
+ Support loading of a LZMA encoded initial ramdisk or cpio buffer
+ If unsure, say N.
+
+config RD_XZ
+ bool "Support initial ramdisk/ramfs compressed using XZ"
+ default y
+ select DECOMPRESS_XZ
+ help
+ Support loading of a XZ encoded initial ramdisk or cpio buffer.
+ If unsure, say N.
+
+config RD_LZO
+ bool "Support initial ramdisk/ramfs compressed using LZO"
+ default y
+ select DECOMPRESS_LZO
+ help
+ Support loading of a LZO encoded initial ramdisk or cpio buffer
+ If unsure, say N.
+
+config RD_LZ4
+ bool "Support initial ramdisk/ramfs compressed using LZ4"
+ default y
+ select DECOMPRESS_LZ4
+ help
+ Support loading of a LZ4 encoded initial ramdisk or cpio buffer
+ If unsure, say N.
+
+config RD_ZSTD
+ bool "Support initial ramdisk/ramfs compressed using ZSTD"
+ default y
+ select DECOMPRESS_ZSTD
+ help
+ Support loading of a ZSTD encoded initial ramdisk or cpio buffer.
+ If unsure, say N.
+
+choice
+ prompt "Built-in initramfs compression mode"
+ depends on INITRAMFS_SOURCE != ""
+ help
+ This option allows you to decide by which algorithm the builtin
+ initramfs will be compressed. Several compression algorithms are
+ available, which differ in efficiency, compression and
+ decompression speed. Compression speed is only relevant
+ when building a kernel. Decompression speed is relevant at
+ each boot. Also the memory usage during decompression may become
+ relevant on memory constrained systems. This is usually based on the
+ dictionary size of the algorithm with algorithms like XZ and LZMA
+ featuring large dictionary sizes.
+
+ High compression options are mostly useful for users who are
+ low on RAM, since it reduces the memory consumption during
+ boot.
+
+ Keep in mind that your build system needs to provide the appropriate
+ compression tool to compress the generated initram cpio file for
+ embedding.
+
+ If in doubt, select 'None'
+
+config INITRAMFS_COMPRESSION_GZIP
+ bool "Gzip"
+ depends on RD_GZIP
+ help
+ Use the old and well tested gzip compression algorithm. Gzip provides
+ a good balance between compression ratio and decompression speed and
+ has a reasonable compression speed. It is also more likely to be
+ supported by your build system as the gzip tool is present by default
+ on most distros.
+
+config INITRAMFS_COMPRESSION_BZIP2
+ bool "Bzip2"
+ depends on RD_BZIP2
+ help
+ It's compression ratio and speed is intermediate. Decompression speed
+ is slowest among the choices. The initramfs size is about 10% smaller
+ with bzip2, in comparison to gzip. Bzip2 uses a large amount of
+ memory. For modern kernels you will need at least 8MB RAM or more for
+ booting.
+
+ If you choose this, keep in mind that you need to have the bzip2 tool
+ available to be able to compress the initram.
+
+config INITRAMFS_COMPRESSION_LZMA
+ bool "LZMA"
+ depends on RD_LZMA
+ help
+ This algorithm's compression ratio is best but has a large dictionary
+ size which might cause issues in memory constrained systems.
+ Decompression speed is between the other choices. Compression is
+ slowest. The initramfs size is about 33% smaller with LZMA in
+ comparison to gzip.
+
+ If you choose this, keep in mind that you may need to install the xz
+ or lzma tools to be able to compress the initram.
+
+config INITRAMFS_COMPRESSION_XZ
+ bool "XZ"
+ depends on RD_XZ
+ help
+ XZ uses the LZMA2 algorithm and has a large dictionary which may cause
+ problems on memory constrained systems. The initramfs size is about
+ 30% smaller with XZ in comparison to gzip. Decompression speed is
+ better than that of bzip2 but worse than gzip and LZO. Compression is
+ slow.
+
+ If you choose this, keep in mind that you may need to install the xz
+ tool to be able to compress the initram.
+
+config INITRAMFS_COMPRESSION_LZO
+ bool "LZO"
+ depends on RD_LZO
+ help
+ It's compression ratio is the second poorest amongst the choices. The
+ kernel size is about 10% bigger than gzip. Despite that, it's
+ decompression speed is the second fastest and it's compression speed
+ is quite fast too.
+
+ If you choose this, keep in mind that you may need to install the lzop
+ tool to be able to compress the initram.
+
+config INITRAMFS_COMPRESSION_LZ4
+ bool "LZ4"
+ depends on RD_LZ4
+ help
+ It's compression ratio is the poorest amongst the choices. The kernel
+ size is about 15% bigger than gzip; however its decompression speed
+ is the fastest.
+
+ If you choose this, keep in mind that most distros don't provide lz4
+ by default which could cause a build failure.
+
+config INITRAMFS_COMPRESSION_ZSTD
+ bool "ZSTD"
+ depends on RD_ZSTD
+ help
+ ZSTD is a compression algorithm targeting intermediate compression
+ with fast decompression speed. It will compress better than GZIP and
+ decompress around the same speed as LZO, but slower than LZ4.
+
+ If you choose this, keep in mind that you may need to install the zstd
+ tool to be able to compress the initram.
+
+config INITRAMFS_COMPRESSION_NONE
+ bool "None"
+ help
+ Do not compress the built-in initramfs at all. This may sound wasteful
+ in space, but, you should be aware that the built-in initramfs will be
+ compressed at a later stage anyways along with the rest of the kernel,
+ on those architectures that support this. However, not compressing the
+ initramfs may lead to slightly higher memory consumption during a
+ short time at boot, while both the cpio image and the unpacked
+ filesystem image will be present in memory simultaneously
+
+endchoice
diff --git a/usr/Makefile b/usr/Makefile
new file mode 100644
index 0000000000..f8e1ad19e0
--- /dev/null
+++ b/usr/Makefile
@@ -0,0 +1,85 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# kbuild file for usr/ - including initramfs image
+#
+
+compress-y := copy
+compress-$(CONFIG_INITRAMFS_COMPRESSION_GZIP) := gzip
+compress-$(CONFIG_INITRAMFS_COMPRESSION_BZIP2) := bzip2
+compress-$(CONFIG_INITRAMFS_COMPRESSION_LZMA) := lzma
+compress-$(CONFIG_INITRAMFS_COMPRESSION_XZ) := xzmisc
+compress-$(CONFIG_INITRAMFS_COMPRESSION_LZO) := lzo
+compress-$(CONFIG_INITRAMFS_COMPRESSION_LZ4) := lz4
+compress-$(CONFIG_INITRAMFS_COMPRESSION_ZSTD) := zstd
+
+obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
+
+$(obj)/initramfs_data.o: $(obj)/initramfs_inc_data
+
+ramfs-input := $(CONFIG_INITRAMFS_SOURCE)
+cpio-data :=
+
+# If CONFIG_INITRAMFS_SOURCE is empty, generate a small initramfs with the
+# default contents.
+ifeq ($(ramfs-input),)
+ramfs-input := $(srctree)/$(src)/default_cpio_list
+endif
+
+ifeq ($(words $(ramfs-input)),1)
+
+# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
+# .cpio, use it directly as an initramfs.
+ifneq ($(filter %.cpio,$(ramfs-input)),)
+cpio-data := $(ramfs-input)
+endif
+
+# If CONFIG_INITRAMFS_SOURCE specifies a single file, and it is suffixed with
+# .cpio.*, use it directly as an initramfs, and avoid double compression.
+ifeq ($(words $(subst .cpio.,$(space),$(ramfs-input))),2)
+cpio-data := $(ramfs-input)
+compress-y := copy
+endif
+
+endif
+
+# For other cases, generate the initramfs cpio archive based on the contents
+# specified by CONFIG_INITRAMFS_SOURCE.
+ifeq ($(cpio-data),)
+
+cpio-data := $(obj)/initramfs_data.cpio
+
+hostprogs := gen_init_cpio
+
+# .initramfs_data.cpio.d is used to identify all files included
+# in initramfs and to detect if any files are added/removed.
+# Removed files are identified by directory timestamp being updated
+# The dependency list is generated by gen_initramfs.sh -l
+-include $(obj)/.initramfs_data.cpio.d
+
+# do not try to update files included in initramfs
+$(deps_initramfs): ;
+
+quiet_cmd_initfs = GEN $@
+ cmd_initfs = \
+ $(CONFIG_SHELL) $< -o $@ -l $(obj)/.initramfs_data.cpio.d \
+ $(if $(CONFIG_INITRAMFS_ROOT_UID), -u $(CONFIG_INITRAMFS_ROOT_UID)) \
+ $(if $(CONFIG_INITRAMFS_ROOT_GID), -g $(CONFIG_INITRAMFS_ROOT_GID)) \
+ $(if $(KBUILD_BUILD_TIMESTAMP), -d "$(KBUILD_BUILD_TIMESTAMP)") \
+ $(ramfs-input)
+
+# We rebuild initramfs_data.cpio if:
+# 1) Any included file is newer than initramfs_data.cpio
+# 2) There are changes in which files are included (added or deleted)
+# 3) If gen_init_cpio are newer than initramfs_data.cpio
+# 4) Arguments to gen_initramfs.sh changes
+$(obj)/initramfs_data.cpio: $(src)/gen_initramfs.sh $(obj)/gen_init_cpio $(deps_initramfs) FORCE
+ $(call if_changed,initfs)
+
+endif
+
+$(obj)/initramfs_inc_data: $(cpio-data) FORCE
+ $(call if_changed,$(compress-y))
+
+targets += initramfs_data.cpio initramfs_inc_data
+
+subdir-$(CONFIG_UAPI_HEADER_TEST) += include
diff --git a/usr/default_cpio_list b/usr/default_cpio_list
new file mode 100644
index 0000000000..37b3864066
--- /dev/null
+++ b/usr/default_cpio_list
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# This is a very simple, default initramfs
+
+dir /dev 0755 0 0
+nod /dev/console 0600 0 0 c 5 1
+dir /root 0700 0 0
diff --git a/usr/dummy-include/stdbool.h b/usr/dummy-include/stdbool.h
new file mode 100644
index 0000000000..54ff9e9c90
--- /dev/null
+++ b/usr/dummy-include/stdbool.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _STDBOOL_H
+#define _STDBOOL_H
+
+#error "Please do not include <stdbool.h> from exported headers"
+
+#endif /* _STDBOOL_H */
diff --git a/usr/dummy-include/stdlib.h b/usr/dummy-include/stdlib.h
new file mode 100644
index 0000000000..e8c21888e3
--- /dev/null
+++ b/usr/dummy-include/stdlib.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _STDLIB_H
+#define _STDLIB_H
+
+#error "Please do not include <stdlib.h> from exported headers"
+
+#endif /* _STDLIB_H */
diff --git a/usr/gen_init_cpio.c b/usr/gen_init_cpio.c
new file mode 100644
index 0000000000..61230532fe
--- /dev/null
+++ b/usr/gen_init_cpio.c
@@ -0,0 +1,688 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <string.h>
+#include <unistd.h>
+#include <time.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <ctype.h>
+#include <limits.h>
+
+/*
+ * Original work by Jeff Garzik
+ *
+ * External file lists, symlink, pipe and fifo support by Thayne Harbaugh
+ * Hard link support by Luciano Rocha
+ */
+
+#define xstr(s) #s
+#define str(s) xstr(s)
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+
+static unsigned int offset;
+static unsigned int ino = 721;
+static time_t default_mtime;
+static bool do_csum = false;
+
+struct file_handler {
+ const char *type;
+ int (*handler)(const char *line);
+};
+
+static void push_string(const char *name)
+{
+ unsigned int name_len = strlen(name) + 1;
+
+ fputs(name, stdout);
+ putchar(0);
+ offset += name_len;
+}
+
+static void push_pad (void)
+{
+ while (offset & 3) {
+ putchar(0);
+ offset++;
+ }
+}
+
+static void push_rest(const char *name)
+{
+ unsigned int name_len = strlen(name) + 1;
+ unsigned int tmp_ofs;
+
+ fputs(name, stdout);
+ putchar(0);
+ offset += name_len;
+
+ tmp_ofs = name_len + 110;
+ while (tmp_ofs & 3) {
+ putchar(0);
+ offset++;
+ tmp_ofs++;
+ }
+}
+
+static void push_hdr(const char *s)
+{
+ fputs(s, stdout);
+ offset += 110;
+}
+
+static void cpio_trailer(void)
+{
+ char s[256];
+ const char name[] = "TRAILER!!!";
+
+ sprintf(s, "%s%08X%08X%08lX%08lX%08X%08lX"
+ "%08X%08X%08X%08X%08X%08X%08X",
+ do_csum ? "070702" : "070701", /* magic */
+ 0, /* ino */
+ 0, /* mode */
+ (long) 0, /* uid */
+ (long) 0, /* gid */
+ 1, /* nlink */
+ (long) 0, /* mtime */
+ 0, /* filesize */
+ 0, /* major */
+ 0, /* minor */
+ 0, /* rmajor */
+ 0, /* rminor */
+ (unsigned)strlen(name)+1, /* namesize */
+ 0); /* chksum */
+ push_hdr(s);
+ push_rest(name);
+
+ while (offset % 512) {
+ putchar(0);
+ offset++;
+ }
+}
+
+static int cpio_mkslink(const char *name, const char *target,
+ unsigned int mode, uid_t uid, gid_t gid)
+{
+ char s[256];
+
+ if (name[0] == '/')
+ name++;
+ sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
+ "%08X%08X%08X%08X%08X%08X%08X",
+ do_csum ? "070702" : "070701", /* magic */
+ ino++, /* ino */
+ S_IFLNK | mode, /* mode */
+ (long) uid, /* uid */
+ (long) gid, /* gid */
+ 1, /* nlink */
+ (long) default_mtime, /* mtime */
+ (unsigned)strlen(target)+1, /* filesize */
+ 3, /* major */
+ 1, /* minor */
+ 0, /* rmajor */
+ 0, /* rminor */
+ (unsigned)strlen(name) + 1,/* namesize */
+ 0); /* chksum */
+ push_hdr(s);
+ push_string(name);
+ push_pad();
+ push_string(target);
+ push_pad();
+ return 0;
+}
+
+static int cpio_mkslink_line(const char *line)
+{
+ char name[PATH_MAX + 1];
+ char target[PATH_MAX + 1];
+ unsigned int mode;
+ int uid;
+ int gid;
+ int rc = -1;
+
+ if (5 != sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX) "s %o %d %d", name, target, &mode, &uid, &gid)) {
+ fprintf(stderr, "Unrecognized dir format '%s'", line);
+ goto fail;
+ }
+ rc = cpio_mkslink(name, target, mode, uid, gid);
+ fail:
+ return rc;
+}
+
+static int cpio_mkgeneric(const char *name, unsigned int mode,
+ uid_t uid, gid_t gid)
+{
+ char s[256];
+
+ if (name[0] == '/')
+ name++;
+ sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
+ "%08X%08X%08X%08X%08X%08X%08X",
+ do_csum ? "070702" : "070701", /* magic */
+ ino++, /* ino */
+ mode, /* mode */
+ (long) uid, /* uid */
+ (long) gid, /* gid */
+ 2, /* nlink */
+ (long) default_mtime, /* mtime */
+ 0, /* filesize */
+ 3, /* major */
+ 1, /* minor */
+ 0, /* rmajor */
+ 0, /* rminor */
+ (unsigned)strlen(name) + 1,/* namesize */
+ 0); /* chksum */
+ push_hdr(s);
+ push_rest(name);
+ return 0;
+}
+
+enum generic_types {
+ GT_DIR,
+ GT_PIPE,
+ GT_SOCK
+};
+
+struct generic_type {
+ const char *type;
+ mode_t mode;
+};
+
+static const struct generic_type generic_type_table[] = {
+ [GT_DIR] = {
+ .type = "dir",
+ .mode = S_IFDIR
+ },
+ [GT_PIPE] = {
+ .type = "pipe",
+ .mode = S_IFIFO
+ },
+ [GT_SOCK] = {
+ .type = "sock",
+ .mode = S_IFSOCK
+ }
+};
+
+static int cpio_mkgeneric_line(const char *line, enum generic_types gt)
+{
+ char name[PATH_MAX + 1];
+ unsigned int mode;
+ int uid;
+ int gid;
+ int rc = -1;
+
+ if (4 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d", name, &mode, &uid, &gid)) {
+ fprintf(stderr, "Unrecognized %s format '%s'",
+ line, generic_type_table[gt].type);
+ goto fail;
+ }
+ mode |= generic_type_table[gt].mode;
+ rc = cpio_mkgeneric(name, mode, uid, gid);
+ fail:
+ return rc;
+}
+
+static int cpio_mkdir_line(const char *line)
+{
+ return cpio_mkgeneric_line(line, GT_DIR);
+}
+
+static int cpio_mkpipe_line(const char *line)
+{
+ return cpio_mkgeneric_line(line, GT_PIPE);
+}
+
+static int cpio_mksock_line(const char *line)
+{
+ return cpio_mkgeneric_line(line, GT_SOCK);
+}
+
+static int cpio_mknod(const char *name, unsigned int mode,
+ uid_t uid, gid_t gid, char dev_type,
+ unsigned int maj, unsigned int min)
+{
+ char s[256];
+
+ if (dev_type == 'b')
+ mode |= S_IFBLK;
+ else
+ mode |= S_IFCHR;
+
+ if (name[0] == '/')
+ name++;
+ sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
+ "%08X%08X%08X%08X%08X%08X%08X",
+ do_csum ? "070702" : "070701", /* magic */
+ ino++, /* ino */
+ mode, /* mode */
+ (long) uid, /* uid */
+ (long) gid, /* gid */
+ 1, /* nlink */
+ (long) default_mtime, /* mtime */
+ 0, /* filesize */
+ 3, /* major */
+ 1, /* minor */
+ maj, /* rmajor */
+ min, /* rminor */
+ (unsigned)strlen(name) + 1,/* namesize */
+ 0); /* chksum */
+ push_hdr(s);
+ push_rest(name);
+ return 0;
+}
+
+static int cpio_mknod_line(const char *line)
+{
+ char name[PATH_MAX + 1];
+ unsigned int mode;
+ int uid;
+ int gid;
+ char dev_type;
+ unsigned int maj;
+ unsigned int min;
+ int rc = -1;
+
+ if (7 != sscanf(line, "%" str(PATH_MAX) "s %o %d %d %c %u %u",
+ name, &mode, &uid, &gid, &dev_type, &maj, &min)) {
+ fprintf(stderr, "Unrecognized nod format '%s'", line);
+ goto fail;
+ }
+ rc = cpio_mknod(name, mode, uid, gid, dev_type, maj, min);
+ fail:
+ return rc;
+}
+
+static int cpio_mkfile_csum(int fd, unsigned long size, uint32_t *csum)
+{
+ while (size) {
+ unsigned char filebuf[65536];
+ ssize_t this_read;
+ size_t i, this_size = MIN(size, sizeof(filebuf));
+
+ this_read = read(fd, filebuf, this_size);
+ if (this_read <= 0 || this_read > this_size)
+ return -1;
+
+ for (i = 0; i < this_read; i++)
+ *csum += filebuf[i];
+
+ size -= this_read;
+ }
+ /* seek back to the start for data segment I/O */
+ if (lseek(fd, 0, SEEK_SET) < 0)
+ return -1;
+
+ return 0;
+}
+
+static int cpio_mkfile(const char *name, const char *location,
+ unsigned int mode, uid_t uid, gid_t gid,
+ unsigned int nlinks)
+{
+ char s[256];
+ struct stat buf;
+ unsigned long size;
+ int file;
+ int retval;
+ int rc = -1;
+ int namesize;
+ unsigned int i;
+ uint32_t csum = 0;
+
+ mode |= S_IFREG;
+
+ file = open (location, O_RDONLY);
+ if (file < 0) {
+ fprintf (stderr, "File %s could not be opened for reading\n", location);
+ goto error;
+ }
+
+ retval = fstat(file, &buf);
+ if (retval) {
+ fprintf(stderr, "File %s could not be stat()'ed\n", location);
+ goto error;
+ }
+
+ if (buf.st_mtime > 0xffffffff) {
+ fprintf(stderr, "%s: Timestamp exceeds maximum cpio timestamp, clipping.\n",
+ location);
+ buf.st_mtime = 0xffffffff;
+ }
+
+ if (buf.st_mtime < 0) {
+ fprintf(stderr, "%s: Timestamp negative, clipping.\n",
+ location);
+ buf.st_mtime = 0;
+ }
+
+ if (buf.st_size > 0xffffffff) {
+ fprintf(stderr, "%s: Size exceeds maximum cpio file size\n",
+ location);
+ goto error;
+ }
+
+ if (do_csum && cpio_mkfile_csum(file, buf.st_size, &csum) < 0) {
+ fprintf(stderr, "Failed to checksum file %s\n", location);
+ goto error;
+ }
+
+ size = 0;
+ for (i = 1; i <= nlinks; i++) {
+ /* data goes on last link */
+ if (i == nlinks)
+ size = buf.st_size;
+
+ if (name[0] == '/')
+ name++;
+ namesize = strlen(name) + 1;
+ sprintf(s,"%s%08X%08X%08lX%08lX%08X%08lX"
+ "%08lX%08X%08X%08X%08X%08X%08X",
+ do_csum ? "070702" : "070701", /* magic */
+ ino, /* ino */
+ mode, /* mode */
+ (long) uid, /* uid */
+ (long) gid, /* gid */
+ nlinks, /* nlink */
+ (long) buf.st_mtime, /* mtime */
+ size, /* filesize */
+ 3, /* major */
+ 1, /* minor */
+ 0, /* rmajor */
+ 0, /* rminor */
+ namesize, /* namesize */
+ size ? csum : 0); /* chksum */
+ push_hdr(s);
+ push_string(name);
+ push_pad();
+
+ while (size) {
+ unsigned char filebuf[65536];
+ ssize_t this_read;
+ size_t this_size = MIN(size, sizeof(filebuf));
+
+ this_read = read(file, filebuf, this_size);
+ if (this_read <= 0 || this_read > this_size) {
+ fprintf(stderr, "Can not read %s file\n", location);
+ goto error;
+ }
+
+ if (fwrite(filebuf, this_read, 1, stdout) != 1) {
+ fprintf(stderr, "writing filebuf failed\n");
+ goto error;
+ }
+ offset += this_read;
+ size -= this_read;
+ }
+ push_pad();
+
+ name += namesize;
+ }
+ ino++;
+ rc = 0;
+
+error:
+ if (file >= 0)
+ close(file);
+ return rc;
+}
+
+static char *cpio_replace_env(char *new_location)
+{
+ char expanded[PATH_MAX + 1];
+ char *start, *end, *var;
+
+ while ((start = strstr(new_location, "${")) &&
+ (end = strchr(start + 2, '}'))) {
+ *start = *end = 0;
+ var = getenv(start + 2);
+ snprintf(expanded, sizeof expanded, "%s%s%s",
+ new_location, var ? var : "", end + 1);
+ strcpy(new_location, expanded);
+ }
+
+ return new_location;
+}
+
+static int cpio_mkfile_line(const char *line)
+{
+ char name[PATH_MAX + 1];
+ char *dname = NULL; /* malloc'ed buffer for hard links */
+ char location[PATH_MAX + 1];
+ unsigned int mode;
+ int uid;
+ int gid;
+ int nlinks = 1;
+ int end = 0, dname_len = 0;
+ int rc = -1;
+
+ if (5 > sscanf(line, "%" str(PATH_MAX) "s %" str(PATH_MAX)
+ "s %o %d %d %n",
+ name, location, &mode, &uid, &gid, &end)) {
+ fprintf(stderr, "Unrecognized file format '%s'", line);
+ goto fail;
+ }
+ if (end && isgraph(line[end])) {
+ int len;
+ int nend;
+
+ dname = malloc(strlen(line));
+ if (!dname) {
+ fprintf (stderr, "out of memory (%d)\n", dname_len);
+ goto fail;
+ }
+
+ dname_len = strlen(name) + 1;
+ memcpy(dname, name, dname_len);
+
+ do {
+ nend = 0;
+ if (sscanf(line + end, "%" str(PATH_MAX) "s %n",
+ name, &nend) < 1)
+ break;
+ len = strlen(name) + 1;
+ memcpy(dname + dname_len, name, len);
+ dname_len += len;
+ nlinks++;
+ end += nend;
+ } while (isgraph(line[end]));
+ } else {
+ dname = name;
+ }
+ rc = cpio_mkfile(dname, cpio_replace_env(location),
+ mode, uid, gid, nlinks);
+ fail:
+ if (dname_len) free(dname);
+ return rc;
+}
+
+static void usage(const char *prog)
+{
+ fprintf(stderr, "Usage:\n"
+ "\t%s [-t <timestamp>] [-c] <cpio_list>\n"
+ "\n"
+ "<cpio_list> is a file containing newline separated entries that\n"
+ "describe the files to be included in the initramfs archive:\n"
+ "\n"
+ "# a comment\n"
+ "file <name> <location> <mode> <uid> <gid> [<hard links>]\n"
+ "dir <name> <mode> <uid> <gid>\n"
+ "nod <name> <mode> <uid> <gid> <dev_type> <maj> <min>\n"
+ "slink <name> <target> <mode> <uid> <gid>\n"
+ "pipe <name> <mode> <uid> <gid>\n"
+ "sock <name> <mode> <uid> <gid>\n"
+ "\n"
+ "<name> name of the file/dir/nod/etc in the archive\n"
+ "<location> location of the file in the current filesystem\n"
+ " expands shell variables quoted with ${}\n"
+ "<target> link target\n"
+ "<mode> mode/permissions of the file\n"
+ "<uid> user id (0=root)\n"
+ "<gid> group id (0=root)\n"
+ "<dev_type> device type (b=block, c=character)\n"
+ "<maj> major number of nod\n"
+ "<min> minor number of nod\n"
+ "<hard links> space separated list of other links to file\n"
+ "\n"
+ "example:\n"
+ "# A simple initramfs\n"
+ "dir /dev 0755 0 0\n"
+ "nod /dev/console 0600 0 0 c 5 1\n"
+ "dir /root 0700 0 0\n"
+ "dir /sbin 0755 0 0\n"
+ "file /sbin/kinit /usr/src/klibc/kinit/kinit 0755 0 0\n"
+ "\n"
+ "<timestamp> is time in seconds since Epoch that will be used\n"
+ "as mtime for symlinks, special files and directories. The default\n"
+ "is to use the current time for these entries.\n"
+ "-c: calculate and store 32-bit checksums for file data.\n",
+ prog);
+}
+
+static const struct file_handler file_handler_table[] = {
+ {
+ .type = "file",
+ .handler = cpio_mkfile_line,
+ }, {
+ .type = "nod",
+ .handler = cpio_mknod_line,
+ }, {
+ .type = "dir",
+ .handler = cpio_mkdir_line,
+ }, {
+ .type = "slink",
+ .handler = cpio_mkslink_line,
+ }, {
+ .type = "pipe",
+ .handler = cpio_mkpipe_line,
+ }, {
+ .type = "sock",
+ .handler = cpio_mksock_line,
+ }, {
+ .type = NULL,
+ .handler = NULL,
+ }
+};
+
+#define LINE_SIZE (2 * PATH_MAX + 50)
+
+int main (int argc, char *argv[])
+{
+ FILE *cpio_list;
+ char line[LINE_SIZE];
+ char *args, *type;
+ int ec = 0;
+ int line_nr = 0;
+ const char *filename;
+
+ default_mtime = time(NULL);
+ while (1) {
+ int opt = getopt(argc, argv, "t:ch");
+ char *invalid;
+
+ if (opt == -1)
+ break;
+ switch (opt) {
+ case 't':
+ default_mtime = strtol(optarg, &invalid, 10);
+ if (!*optarg || *invalid) {
+ fprintf(stderr, "Invalid timestamp: %s\n",
+ optarg);
+ usage(argv[0]);
+ exit(1);
+ }
+ break;
+ case 'c':
+ do_csum = true;
+ break;
+ case 'h':
+ case '?':
+ usage(argv[0]);
+ exit(opt == 'h' ? 0 : 1);
+ }
+ }
+
+ /*
+ * Timestamps after 2106-02-07 06:28:15 UTC have an ascii hex time_t
+ * representation that exceeds 8 chars and breaks the cpio header
+ * specification. Negative timestamps similarly exceed 8 chars.
+ */
+ if (default_mtime > 0xffffffff || default_mtime < 0) {
+ fprintf(stderr, "ERROR: Timestamp out of range for cpio format\n");
+ exit(1);
+ }
+
+ if (argc - optind != 1) {
+ usage(argv[0]);
+ exit(1);
+ }
+ filename = argv[optind];
+ if (!strcmp(filename, "-"))
+ cpio_list = stdin;
+ else if (!(cpio_list = fopen(filename, "r"))) {
+ fprintf(stderr, "ERROR: unable to open '%s': %s\n\n",
+ filename, strerror(errno));
+ usage(argv[0]);
+ exit(1);
+ }
+
+ while (fgets(line, LINE_SIZE, cpio_list)) {
+ int type_idx;
+ size_t slen = strlen(line);
+
+ line_nr++;
+
+ if ('#' == *line) {
+ /* comment - skip to next line */
+ continue;
+ }
+
+ if (! (type = strtok(line, " \t"))) {
+ fprintf(stderr,
+ "ERROR: incorrect format, could not locate file type line %d: '%s'\n",
+ line_nr, line);
+ ec = -1;
+ break;
+ }
+
+ if ('\n' == *type) {
+ /* a blank line */
+ continue;
+ }
+
+ if (slen == strlen(type)) {
+ /* must be an empty line */
+ continue;
+ }
+
+ if (! (args = strtok(NULL, "\n"))) {
+ fprintf(stderr,
+ "ERROR: incorrect format, newline required line %d: '%s'\n",
+ line_nr, line);
+ ec = -1;
+ }
+
+ for (type_idx = 0; file_handler_table[type_idx].type; type_idx++) {
+ int rc;
+ if (! strcmp(line, file_handler_table[type_idx].type)) {
+ if ((rc = file_handler_table[type_idx].handler(args))) {
+ ec = rc;
+ fprintf(stderr, " line %d\n", line_nr);
+ }
+ break;
+ }
+ }
+
+ if (NULL == file_handler_table[type_idx].type) {
+ fprintf(stderr, "unknown file type line %d: '%s'\n",
+ line_nr, line);
+ }
+ }
+ if (ec == 0)
+ cpio_trailer();
+
+ exit(ec);
+}
diff --git a/usr/gen_initramfs.sh b/usr/gen_initramfs.sh
new file mode 100755
index 0000000000..14b5782f96
--- /dev/null
+++ b/usr/gen_initramfs.sh
@@ -0,0 +1,249 @@
+#!/bin/sh
+# Copyright (C) Martin Schlemmer <azarah@nosferatu.za.org>
+# Copyright (C) 2006 Sam Ravnborg <sam@ravnborg.org>
+#
+# Released under the terms of the GNU GPL
+#
+# Generate a cpio packed initramfs. It uses gen_init_cpio to generate
+# the cpio archive.
+# This script assumes that gen_init_cpio is located in usr/ directory
+
+# error out on errors
+set -e
+
+usage() {
+cat << EOF
+Usage:
+$0 [-o <file>] [-l <dep_list>] [-u <uid>] [-g <gid>] {-d | <cpio_source>} ...
+ -o <file> Create initramfs file named <file> by using gen_init_cpio
+ -l <dep_list> Create dependency list named <dep_list>
+ -u <uid> User ID to map to user ID 0 (root).
+ <uid> is only meaningful if <cpio_source> is a
+ directory. "squash" forces all files to uid 0.
+ -g <gid> Group ID to map to group ID 0 (root).
+ <gid> is only meaningful if <cpio_source> is a
+ directory. "squash" forces all files to gid 0.
+ -d <date> Use date for all file mtime values
+ <cpio_source> File list or directory for cpio archive.
+ If <cpio_source> is a .cpio file it will be used
+ as direct input to initramfs.
+
+All options except -o and -l may be repeated and are interpreted
+sequentially and immediately. -u and -g states are preserved across
+<cpio_source> options so an explicit "-u 0 -g 0" is required
+to reset the root/group mapping.
+EOF
+}
+
+# awk style field access
+# $1 - field number; rest is argument string
+field() {
+ shift $1 ; echo $1
+}
+
+filetype() {
+ local argv1="$1"
+
+ # symlink test must come before file test
+ if [ -L "${argv1}" ]; then
+ echo "slink"
+ elif [ -f "${argv1}" ]; then
+ echo "file"
+ elif [ -d "${argv1}" ]; then
+ echo "dir"
+ elif [ -b "${argv1}" -o -c "${argv1}" ]; then
+ echo "nod"
+ elif [ -p "${argv1}" ]; then
+ echo "pipe"
+ elif [ -S "${argv1}" ]; then
+ echo "sock"
+ else
+ echo "invalid"
+ fi
+ return 0
+}
+
+print_mtime() {
+ local my_mtime="0"
+
+ if [ -e "$1" ]; then
+ my_mtime=$(find "$1" -printf "%T@\n" | sort -r | head -n 1)
+ fi
+
+ echo "# Last modified: ${my_mtime}" >> $cpio_list
+ echo "" >> $cpio_list
+}
+
+list_parse() {
+ if [ -z "$dep_list" -o -L "$1" ]; then
+ return
+ fi
+ echo "$1" | sed 's/:/\\:/g; s/$/ \\/' >> $dep_list
+}
+
+# for each file print a line in following format
+# <filetype> <name> <path to file> <octal mode> <uid> <gid>
+# for links, devices etc the format differs. See gen_init_cpio for details
+parse() {
+ local location="$1"
+ local name="/${location#${srcdir}}"
+ # change '//' into '/'
+ name=$(echo "$name" | sed -e 's://*:/:g')
+ local mode="$2"
+ local uid="$3"
+ local gid="$4"
+ local ftype=$(filetype "${location}")
+ # remap uid/gid to 0 if necessary
+ [ "$root_uid" = "squash" ] && uid=0 || [ "$uid" -eq "$root_uid" ] && uid=0
+ [ "$root_gid" = "squash" ] && gid=0 || [ "$gid" -eq "$root_gid" ] && gid=0
+ local str="${mode} ${uid} ${gid}"
+
+ [ "${ftype}" = "invalid" ] && return 0
+ [ "${location}" = "${srcdir}" ] && return 0
+
+ case "${ftype}" in
+ "file")
+ str="${ftype} ${name} ${location} ${str}"
+ ;;
+ "nod")
+ local dev="`LC_ALL=C ls -l "${location}"`"
+ local maj=`field 5 ${dev}`
+ local min=`field 6 ${dev}`
+ maj=${maj%,}
+
+ [ -b "${location}" ] && dev="b" || dev="c"
+
+ str="${ftype} ${name} ${str} ${dev} ${maj} ${min}"
+ ;;
+ "slink")
+ local target=`readlink "${location}"`
+ str="${ftype} ${name} ${target} ${str}"
+ ;;
+ *)
+ str="${ftype} ${name} ${str}"
+ ;;
+ esac
+
+ echo "${str}" >> $cpio_list
+
+ return 0
+}
+
+unknown_option() {
+ printf "ERROR: unknown option \"$arg\"\n" >&2
+ printf "If the filename validly begins with '-', " >&2
+ printf "then it must be prefixed\n" >&2
+ printf "by './' so that it won't be interpreted as an option." >&2
+ printf "\n" >&2
+ usage >&2
+ exit 1
+}
+
+header() {
+ printf "\n#####################\n# $1\n" >> $cpio_list
+}
+
+# process one directory (incl sub-directories)
+dir_filelist() {
+ header "$1"
+
+ srcdir=$(echo "$1" | sed -e 's://*:/:g')
+ dirlist=$(find "${srcdir}" -printf "%p %m %U %G\n" | LC_ALL=C sort)
+
+ # If $dirlist is only one line, then the directory is empty
+ if [ "$(echo "${dirlist}" | wc -l)" -gt 1 ]; then
+ print_mtime "$1"
+
+ echo "${dirlist}" | \
+ while read x; do
+ list_parse $x
+ parse $x
+ done
+ fi
+}
+
+input_file() {
+ source="$1"
+ if [ -f "$1" ]; then
+ # If a regular file is specified, assume it is in
+ # gen_init_cpio format
+ header "$1"
+ print_mtime "$1" >> $cpio_list
+ cat "$1" >> $cpio_list
+ if [ -n "$dep_list" ]; then
+ echo "$1 \\" >> $dep_list
+ cat "$1" | while read type dir file perm ; do
+ if [ "$type" = "file" ]; then
+ echo "$file \\" >> $dep_list
+ fi
+ done
+ fi
+ elif [ -d "$1" ]; then
+ # If a directory is specified then add all files in it to fs
+ dir_filelist "$1"
+ else
+ echo " ${prog}: Cannot open '$1'" >&2
+ exit 1
+ fi
+}
+
+prog=$0
+root_uid=0
+root_gid=0
+dep_list=
+timestamp=
+cpio_list=$(mktemp ${TMPDIR:-/tmp}/cpiolist.XXXXXX)
+output="/dev/stdout"
+
+trap "rm -f $cpio_list" EXIT
+
+while [ $# -gt 0 ]; do
+ arg="$1"
+ shift
+ case "$arg" in
+ "-l") # files included in initramfs - used by kbuild
+ dep_list="$1"
+ echo "deps_initramfs := \\" > $dep_list
+ shift
+ ;;
+ "-o") # generate cpio image named $1
+ output="$1"
+ shift
+ ;;
+ "-u") # map $1 to uid=0 (root)
+ root_uid="$1"
+ [ "$root_uid" = "-1" ] && root_uid=$(id -u || echo 0)
+ shift
+ ;;
+ "-g") # map $1 to gid=0 (root)
+ root_gid="$1"
+ [ "$root_gid" = "-1" ] && root_gid=$(id -g || echo 0)
+ shift
+ ;;
+ "-d") # date for file mtimes
+ timestamp="$(date -d"$1" +%s || :)"
+ if test -n "$timestamp"; then
+ timestamp="-t $timestamp"
+ fi
+ shift
+ ;;
+ "-h")
+ usage
+ exit 0
+ ;;
+ *)
+ case "$arg" in
+ "-"*)
+ unknown_option
+ ;;
+ *) # input file/dir - process it
+ input_file "$arg"
+ ;;
+ esac
+ ;;
+ esac
+done
+
+# If output_file is set we will generate cpio archive
+# we are careful to delete tmp files
+usr/gen_init_cpio $timestamp $cpio_list > $output
diff --git a/usr/include/.gitignore b/usr/include/.gitignore
new file mode 100644
index 0000000000..17b0ba1bd3
--- /dev/null
+++ b/usr/include/.gitignore
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+/*/
diff --git a/usr/include/Makefile b/usr/include/Makefile
new file mode 100644
index 0000000000..07796df0a2
--- /dev/null
+++ b/usr/include/Makefile
@@ -0,0 +1,95 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+# Unlike the kernel space, exported headers are written in standard C.
+# - Forbid C++ style comments
+# - Use '__inline__', '__asm__' instead of 'inline', 'asm'
+#
+# -std=c90 (equivalent to -ansi) catches the violation of those.
+# We cannot go as far as adding -Wpedantic since it emits too many warnings.
+UAPI_CFLAGS := -std=c90 -Wall -Werror=implicit-function-declaration
+
+# In theory, we do not care -m32 or -m64 for header compile tests.
+# It is here just because CONFIG_CC_CAN_LINK is tested with -m32 or -m64.
+UAPI_CFLAGS += $(filter -m32 -m64 --target=%, $(KBUILD_CFLAGS))
+
+# USERCFLAGS might contain sysroot location for CC.
+UAPI_CFLAGS += $(USERCFLAGS)
+
+override c_flags = $(UAPI_CFLAGS) -Wp,-MMD,$(depfile) -I $(obj) -I $(srctree)/usr/dummy-include
+
+# The following are excluded for now because they fail to build.
+#
+# Do not add a new header to the blacklist without legitimate reason.
+# Please consider to fix the header first.
+#
+# Sorted alphabetically.
+no-header-test += asm/ucontext.h
+no-header-test += drm/vmwgfx_drm.h
+no-header-test += linux/am437x-vpfe.h
+no-header-test += linux/coda.h
+no-header-test += linux/cyclades.h
+no-header-test += linux/errqueue.h
+no-header-test += linux/hdlc/ioctl.h
+no-header-test += linux/ivtv.h
+no-header-test += linux/matroxfb.h
+no-header-test += linux/omap3isp.h
+no-header-test += linux/omapfb.h
+no-header-test += linux/patchkey.h
+no-header-test += linux/phonet.h
+no-header-test += linux/sctp.h
+no-header-test += linux/sysctl.h
+no-header-test += linux/usb/audio.h
+no-header-test += linux/v4l2-mediabus.h
+no-header-test += linux/v4l2-subdev.h
+no-header-test += linux/videodev2.h
+no-header-test += linux/vm_sockets.h
+no-header-test += sound/asequencer.h
+no-header-test += sound/asoc.h
+no-header-test += sound/asound.h
+no-header-test += sound/compress_offload.h
+no-header-test += sound/emu10k1.h
+no-header-test += sound/sfnt_info.h
+no-header-test += xen/evtchn.h
+no-header-test += xen/gntdev.h
+no-header-test += xen/privcmd.h
+
+# More headers are broken in some architectures
+
+ifeq ($(SRCARCH),arc)
+no-header-test += linux/bpf_perf_event.h
+endif
+
+ifeq ($(SRCARCH),ia64)
+no-header-test += asm/setup.h
+no-header-test += asm/sigcontext.h
+no-header-test += linux/if_bonding.h
+endif
+
+ifeq ($(SRCARCH),powerpc)
+no-header-test += linux/bpf_perf_event.h
+endif
+
+ifeq ($(SRCARCH),sparc)
+no-header-test += asm/uctx.h
+no-header-test += asm/fbio.h
+endif
+
+# asm-generic/*.h is used by asm/*.h, and should not be included directly
+no-header-test += asm-generic/%
+
+always-y := $(patsubst $(obj)/%.h,%.hdrtest, $(shell find $(obj) -name '*.h' 2>/dev/null))
+
+# Include the header twice to detect missing include guard.
+quiet_cmd_hdrtest = HDRTEST $<
+ cmd_hdrtest = \
+ $(CC) $(c_flags) -fsyntax-only -x c /dev/null \
+ $(if $(filter-out $(no-header-test), $*.h), -include $< -include $<); \
+ $(PERL) $(srctree)/$(src)/headers_check.pl $(obj) $(SRCARCH) $<; \
+ touch $@
+
+$(obj)/%.hdrtest: $(obj)/%.h FORCE
+ $(call if_changed_dep,hdrtest)
+
+# Since GNU Make 4.3, $(patsubst $(obj)/%/,%,$(wildcard $(obj)/*/)) works.
+# To support older Make versions, use a somewhat tedious way.
+clean-files += $(filter-out Makefile headers_check.pl, $(notdir $(wildcard $(obj)/*)))
diff --git a/usr/include/headers_check.pl b/usr/include/headers_check.pl
new file mode 100755
index 0000000000..b6aec5e436
--- /dev/null
+++ b/usr/include/headers_check.pl
@@ -0,0 +1,171 @@
+#!/usr/bin/env perl
+# SPDX-License-Identifier: GPL-2.0
+#
+# headers_check.pl execute a number of trivial consistency checks
+#
+# Usage: headers_check.pl dir arch [files...]
+# dir: dir to look for included files
+# arch: architecture
+# files: list of files to check
+#
+# The script reads the supplied files line by line and:
+#
+# 1) for each include statement it checks if the
+# included file actually exists.
+# Only include files located in asm* and linux* are checked.
+# The rest are assumed to be system include files.
+#
+# 2) It is checked that prototypes does not use "extern"
+#
+# 3) Check for leaked CONFIG_ symbols
+
+use warnings;
+use strict;
+use File::Basename;
+
+my ($dir, $arch, @files) = @ARGV;
+
+my $ret = 0;
+my $line;
+my $lineno = 0;
+my $filename;
+
+foreach my $file (@files) {
+ $filename = $file;
+
+ open(my $fh, '<', $filename)
+ or die "$filename: $!\n";
+ $lineno = 0;
+ while ($line = <$fh>) {
+ $lineno++;
+ &check_include();
+ &check_asm_types();
+ &check_sizetypes();
+ &check_declarations();
+ # Dropped for now. Too much noise &check_config();
+ }
+ close $fh;
+}
+exit $ret;
+
+sub check_include
+{
+ if ($line =~ m/^\s*#\s*include\s+<((asm|linux).*)>/) {
+ my $inc = $1;
+ my $found;
+ $found = stat($dir . "/" . $inc);
+ if (!$found) {
+ $inc =~ s#asm/#asm-$arch/#;
+ $found = stat($dir . "/" . $inc);
+ }
+ if (!$found) {
+ printf STDERR "$filename:$lineno: included file '$inc' is not exported\n";
+ $ret = 1;
+ }
+ }
+}
+
+sub check_declarations
+{
+ # soundcard.h is what it is
+ if ($line =~ m/^void seqbuf_dump\(void\);/) {
+ return;
+ }
+ # drm headers are being C++ friendly
+ if ($line =~ m/^extern "C"/) {
+ return;
+ }
+ if ($line =~ m/^(\s*extern|unsigned|char|short|int|long|void)\b/) {
+ printf STDERR "$filename:$lineno: " .
+ "userspace cannot reference function or " .
+ "variable defined in the kernel\n";
+ }
+}
+
+sub check_config
+{
+ if ($line =~ m/[^a-zA-Z0-9_]+CONFIG_([a-zA-Z0-9_]+)[^a-zA-Z0-9_]/) {
+ printf STDERR "$filename:$lineno: leaks CONFIG_$1 to userspace where it is not valid\n";
+ }
+}
+
+my $linux_asm_types;
+sub check_asm_types
+{
+ if ($filename =~ /types.h|int-l64.h|int-ll64.h/o) {
+ return;
+ }
+ if ($lineno == 1) {
+ $linux_asm_types = 0;
+ } elsif ($linux_asm_types >= 1) {
+ return;
+ }
+ if ($line =~ m/^\s*#\s*include\s+<asm\/types.h>/) {
+ $linux_asm_types = 1;
+ printf STDERR "$filename:$lineno: " .
+ "include of <linux/types.h> is preferred over <asm/types.h>\n"
+ # Warn until headers are all fixed
+ #$ret = 1;
+ }
+}
+
+my $linux_types;
+my %import_stack = ();
+sub check_include_typesh
+{
+ my $path = $_[0];
+ my $import_path;
+
+ my $fh;
+ my @file_paths = ($path, $dir . "/" . $path, dirname($filename) . "/" . $path);
+ for my $possible ( @file_paths ) {
+ if (not $import_stack{$possible} and open($fh, '<', $possible)) {
+ $import_path = $possible;
+ $import_stack{$import_path} = 1;
+ last;
+ }
+ }
+ if (eof $fh) {
+ return;
+ }
+
+ my $line;
+ while ($line = <$fh>) {
+ if ($line =~ m/^\s*#\s*include\s+<linux\/types.h>/) {
+ $linux_types = 1;
+ last;
+ }
+ if (my $included = ($line =~ /^\s*#\s*include\s+[<"](\S+)[>"]/)[0]) {
+ check_include_typesh($included);
+ }
+ }
+ close $fh;
+ delete $import_stack{$import_path};
+}
+
+sub check_sizetypes
+{
+ if ($filename =~ /types.h|int-l64.h|int-ll64.h/o) {
+ return;
+ }
+ if ($lineno == 1) {
+ $linux_types = 0;
+ } elsif ($linux_types >= 1) {
+ return;
+ }
+ if ($line =~ m/^\s*#\s*include\s+<linux\/types.h>/) {
+ $linux_types = 1;
+ return;
+ }
+ if (my $included = ($line =~ /^\s*#\s*include\s+[<"](\S+)[>"]/)[0]) {
+ check_include_typesh($included);
+ }
+ if ($line =~ m/__[us](8|16|32|64)\b/) {
+ printf STDERR "$filename:$lineno: " .
+ "found __[us]{8,16,32,64} type " .
+ "without #include <linux/types.h>\n";
+ $linux_types = 2;
+ # Warn until headers are all fixed
+ #$ret = 1;
+ }
+}
diff --git a/usr/initramfs_data.S b/usr/initramfs_data.S
new file mode 100644
index 0000000000..cd67edc387
--- /dev/null
+++ b/usr/initramfs_data.S
@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ initramfs_data includes the compressed binary that is the
+ filesystem used for early user space.
+ Note: Older versions of "as" (prior to binutils 2.11.90.0.23
+ released on 2001-07-14) dit not support .incbin.
+ If you are forced to use older binutils than that then the
+ following trick can be applied to create the resulting binary:
+
+
+ ld -m elf_i386 --format binary --oformat elf32-i386 -r \
+ -T initramfs_data.scr initramfs_data.cpio.gz -o initramfs_data.o
+ ld -m elf_i386 -r -o built-in.a initramfs_data.o
+
+ For including the .init.ramfs sections, see include/asm-generic/vmlinux.lds.
+
+ The above example is for i386 - the parameters vary from architectures.
+ Eventually look up LDFLAGS_BLOB in an older version of the
+ arch/$(ARCH)/Makefile to see the flags used before .incbin was introduced.
+
+ Using .incbin has the advantage over ld that the correct flags are set
+ in the ELF header, as required by certain architectures.
+*/
+
+.section .init.ramfs,"a"
+__irf_start:
+.incbin "usr/initramfs_inc_data"
+__irf_end:
+.section .init.ramfs.info,"a"
+.globl __initramfs_size
+__initramfs_size:
+#ifdef CONFIG_64BIT
+ .quad __irf_end - __irf_start
+#else
+ .long __irf_end - __irf_start
+#endif