From: Geoff Levand <geoff@infradead.org>
Date: Mon, 15 Jul 2013 23:32:36 +0000 (-0700)
Subject: Add arm64 support
X-Git-Url: https://git.linaro.org/gitweb?p=people%2Fgeoff%2Fkexec-tools.git;a=commitdiff_plain;h=fbf5ac6c2c70ec0f6da2b9ff563e573999752c01

Add arm64 support

Signed-off-by: Geoff Levand <geoff@infradead.org>

Get patch from:
https://fedorapeople.org/~hrw/aarch64/for-fedora/kexec-aarch64.patch

Upstream-Status: Pending

Signed-off-by: Kai Kang <kai.kang@windriver.com>
---

---
 configure.ac                            |    3 
 kexec/Makefile                          |    1 
 kexec/arch/arm64/Makefile               |   13 +
 kexec/arch/arm64/crashdump-arm64.c      |  305 ++++++++++++++++++++++++++++++++
 kexec/arch/arm64/include/arch/options.h |   26 ++
 kexec/arch/arm64/kexec-arm64.c          |  177 ++++++++++++++++++
 kexec/arch/arm64/kexec-arm64.h          |   20 ++
 kexec/arch/arm64/kexec-elf-arm64.c      |  114 +++++++++++
 kexec/kexec-syscall.h                   |    9 
 kexec/kexec.c                           |    2 
 purgatory/arch/arm64/Makefile           |    7 
 11 files changed, 675 insertions(+), 2 deletions(-)

--- a/configure.ac
+++ b/configure.ac
@@ -35,6 +35,9 @@ case $target_cpu in
 		ARCH="ppc64"
 		SUBARCH="LE"
 		;;
+	aarch64* )
+		ARCH="arm64"
+		;;
 	arm* )
 		ARCH="arm"
 		;;
--- a/kexec/Makefile
+++ b/kexec/Makefile
@@ -71,6 +71,7 @@ KEXEC_SRCS			+= $($(ARCH)_FS2DT)
 
 include $(srcdir)/kexec/arch/alpha/Makefile
 include $(srcdir)/kexec/arch/arm/Makefile
+include $(srcdir)/kexec/arch/arm64/Makefile
 include $(srcdir)/kexec/arch/i386/Makefile
 include $(srcdir)/kexec/arch/ia64/Makefile
 include $(srcdir)/kexec/arch/m68k/Makefile
--- /dev/null
+++ b/kexec/arch/arm64/Makefile
@@ -0,0 +1,13 @@
+
+arm64_KEXEC_SRCS += \
+	kexec/arch/arm64/kexec-arm64.c \
+	kexec/arch/arm64/kexec-elf-arm64.c \
+	kexec/arch/arm64/crashdump-arm64.c
+
+arm64_ARCH_REUSE_INITRD =
+arm64_ADD_SEGMENT =
+arm64_VIRT_TO_PHYS =
+
+dist += $(arm64_KEXEC_SRCS) \
+	kexec/arch/arm64/Makefile \
+	kexec/arch/arm64/kexec-arm64.h
--- /dev/null
+++ b/kexec/arch/arm64/crashdump-arm64.c
@@ -0,0 +1,305 @@
+/*
+ * 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 of the License).
+ */
+
+#include "../../kexec.h"
+#include "../../kexec-elf.h"
+#include "../../crashdump.h"
+
+int is_crashkernel_mem_reserved(void)
+{
+	return 0;
+}
+
+#if 0
+/*
+ * Used to save various memory ranges/regions needed for the captured
+ * kernel to boot. (lime memmap= option in other archs)
+ */
+static struct memory_range crash_memory_ranges[CRASH_MAX_MEMORY_RANGES];
+struct memory_ranges usablemem_rgns = {
+    .size = 0,
+    .ranges = crash_memory_ranges,
+};
+
+/* memory range reserved for crashkernel */
+static struct memory_range crash_reserved_mem;
+
+static struct crash_elf_info elf_info = {
+	.class		= ELFCLASS32,
+	.data		= ELFDATA2LSB,
+	.machine	= EM_ARM,
+	.page_offset	= PAGE_OFFSET,
+};
+
+unsigned long phys_offset;
+
+/**
+ * crash_range_callback() - callback called for each iomem region
+ * @data: not used
+ * @nr: not used
+ * @str: name of the memory region
+ * @base: start address of the memory region
+ * @length: size of the memory region
+ *
+ * This function is called once for each memory region found in /proc/iomem. It
+ * locates system RAM and crashkernel reserved memory and places these to
+ * variables: @crash_memory_ranges and @crash_reserved_mem. Number of memory
+ * regions is placed in @crash_memory_nr_ranges.
+ */
+static int crash_range_callback(void *UNUSED(data), int UNUSED(nr),
+				char *str, unsigned long base,
+				unsigned long length)
+{
+	struct memory_range *range;
+
+	if (usablemem_rgns.size >= CRASH_MAX_MEMORY_RANGES)
+		return 1;
+
+	range = usablemem_rgns.ranges + usablemem_rgns.size;
+
+	if (strncmp(str, "System RAM\n", 11) == 0) {
+		range->start = base;
+		range->end = base + length - 1;
+		range->type = RANGE_RAM;
+		usablemem_rgns.size++;
+	} else if (strncmp(str, "Crash kernel\n", 13) == 0) {
+		crash_reserved_mem.start = base;
+		crash_reserved_mem.end = base + length - 1;
+		crash_reserved_mem.type = RANGE_RAM;
+	}
+
+	return 0;
+}
+
+/**
+ * crash_exclude_range() - excludes memory region reserved for crashkernel
+ *
+ * Function locates where crashkernel reserved memory is and removes that region
+ * from the available memory regions.
+ */
+static void crash_exclude_range(void)
+{
+	const struct memory_range *range = &crash_reserved_mem;
+	int i;
+
+	for (i = 0; i < usablemem_rgns.size; i++) {
+		struct memory_range *r = usablemem_rgns.ranges + i;
+
+		/*
+		 * We assume that crash area is fully contained in
+		 * some larger memory area.
+		 */
+		if (r->start <= range->start && r->end >= range->end) {
+			struct memory_range *new;
+			/*
+			 * Let's split this area into 2 smaller ones and
+			 * remove excluded range from between. First create
+			 * new entry for the remaining area.
+			 */
+			new = usablemem_rgns.ranges + usablemem_rgns.size;
+			new->start = range->end + 1;
+			new->end = r->end;
+			usablemem_rgns.size++;
+			/*
+			 * Next update this area to end before excluded range.
+			 */
+			r->end = range->start - 1;
+			break;
+		}
+	}
+}
+
+static int range_cmp(const void *a1, const void *a2)
+{
+	const struct memory_range *r1 = a1;
+	const struct memory_range *r2 = a2;
+
+	if (r1->start > r2->start)
+		return 1;
+	if (r1->start < r2->start)
+		return -1;
+
+	return 0;
+}
+
+/**
+ * crash_get_memory_ranges() - read system physical memory
+ *
+ * Function reads through system physical memory and stores found memory regions
+ * in @crash_memory_ranges. Number of memory regions found is placed in
+ * @crash_memory_nr_ranges. Regions are sorted in ascending order.
+ *
+ * Returns %0 in case of success and %-1 otherwise (errno is set).
+ */
+static int crash_get_memory_ranges(void)
+{
+	/*
+	 * First read all memory regions that can be considered as
+	 * system memory including the crash area.
+	 */
+	kexec_iomem_for_each_line(NULL, crash_range_callback, NULL);
+
+	if (usablemem_rgns.size < 1) {
+		errno = EINVAL;
+		return -1;
+	}
+
+	/*
+	 * Exclude memory reserved for crashkernel (this may result a split memory
+	 * region).
+	 */
+	crash_exclude_range();
+
+	/*
+	 * Make sure that the memory regions are sorted.
+	 */
+	qsort(usablemem_rgns.ranges, usablemem_rgns.size,
+	      sizeof(*usablemem_rgns.ranges), range_cmp);
+
+	return 0;
+}
+
+/**
+ * cmdline_add_elfcorehdr() - adds elfcorehdr= to @cmdline
+ * @cmdline: buffer where parameter is placed
+ * @elfcorehdr: physical address of elfcorehdr
+ *
+ * Function appends 'elfcorehdr=start' at the end of the command line given in
+ * @cmdline. Note that @cmdline must be at least %COMMAND_LINE_SIZE bytes long
+ * (inclunding %NUL).
+ */
+static void cmdline_add_elfcorehdr(char *cmdline, unsigned long elfcorehdr)
+{
+	char buf[COMMAND_LINE_SIZE];
+	int buflen;
+
+	buflen = snprintf(buf, sizeof(buf), "%s elfcorehdr=%#lx",
+			  cmdline, elfcorehdr);
+	if (buflen < 0)
+		die("Failed to construct elfcorehdr= command line parameter\n");
+	if (buflen >= sizeof(buf))
+		die("Command line overflow\n");
+
+	(void) strncpy(cmdline, buf, COMMAND_LINE_SIZE);
+	cmdline[COMMAND_LINE_SIZE - 1] = '\0';
+}
+
+/**
+ * cmdline_add_mem() - adds mem= parameter to kernel command line
+ * @cmdline: buffer where parameter is placed
+ * @size: size of the kernel reserved memory (in bytes)
+ *
+ * This function appends 'mem=size' at the end of the command line given in
+ * @cmdline. Note that @cmdline must be at least %COMMAND_LINE_SIZE bytes long
+ * (including %NUL).
+ */
+static void cmdline_add_mem(char *cmdline, unsigned long size)
+{
+	char buf[COMMAND_LINE_SIZE];
+	int buflen;
+
+	buflen = snprintf(buf, sizeof(buf), "%s mem=%ldK", cmdline, size >> 10);
+	if (buflen < 0)
+		die("Failed to construct mem= command line parameter\n");
+	if (buflen >= sizeof(buf))
+		die("Command line overflow\n");
+
+	(void) strncpy(cmdline, buf, COMMAND_LINE_SIZE);
+	cmdline[COMMAND_LINE_SIZE - 1] = '\0';
+}
+
+static unsigned long long range_size(const struct memory_range *r)
+{
+	return r->end - r->start + 1;
+}
+
+static void dump_memory_ranges(void)
+{
+	int i;
+
+	if (!kexec_debug)
+		return;
+
+	dbgprintf("crashkernel: [%#llx - %#llx] (%ldM)\n",
+		  crash_reserved_mem.start, crash_reserved_mem.end,
+		  (unsigned long)range_size(&crash_reserved_mem) >> 20);
+
+	for (i = 0; i < usablemem_rgns.size; i++) {
+		struct memory_range *r = usablemem_rgns.ranges + i;
+		dbgprintf("memory range: [%#llx - %#llx] (%ldM)\n",
+			  r->start, r->end, (unsigned long)range_size(r) >> 20);
+	}
+}
+
+/**
+ * load_crashdump_segments() - loads additional segments needed for kdump
+ * @info: kexec info structure
+ * @mod_cmdline: kernel command line
+ *
+ * This function loads additional segments which are needed for the dump capture
+ * kernel. It also updates kernel command line passed in @mod_cmdline to have
+ * right parameters for the dump capture kernel.
+ *
+ * Return %0 in case of success and %-1 in case of error.
+ */
+int load_crashdump_segments(struct kexec_info *info, char *mod_cmdline)
+{
+	unsigned long elfcorehdr;
+	unsigned long bufsz;
+	void *buf;
+	int err;
+
+	/*
+	 * First fetch all the memory (RAM) ranges that we are going to pass to
+	 * the crashdump kernel during panic.
+	 */
+	err = crash_get_memory_ranges();
+	if (err)
+		return err;
+
+	/*
+	 * Now that we have memory regions sorted, we can use first memory
+	 * region as PHYS_OFFSET.
+	 */
+	phys_offset = usablemem_rgns.ranges->start;
+	dbgprintf("phys_offset: %#lx\n", phys_offset);
+
+	err = crash_create_elf32_headers(info, &elf_info,
+					 usablemem_rgns.ranges,
+					 usablemem_rgns.size, &buf, &bufsz,
+					 ELF_CORE_HEADER_ALIGN);
+	if (err)
+		return err;
+
+	/*
+	 * We allocate ELF core header from the end of the memory area reserved
+	 * for the crashkernel. We align the header to SECTION_SIZE (which is
+	 * 1MB) so that available memory passed in kernel command line will be
+	 * aligned to 1MB. This is because kernel create_mapping() wants memory
+	 * regions to be aligned to SECTION_SIZE.
+	 */
+	elfcorehdr = add_buffer_phys_virt(info, buf, bufsz, bufsz, 1 << 20,
+					  crash_reserved_mem.start,
+					  crash_reserved_mem.end, -1, 0);
+
+	dbgprintf("elfcorehdr: %#lx\n", elfcorehdr);
+	cmdline_add_elfcorehdr(mod_cmdline, elfcorehdr);
+
+	/*
+	 * Add 'mem=size' parameter to dump capture kernel command line. This
+	 * prevents the dump capture kernel from using any other memory regions
+	 * which belong to the primary kernel.
+	 */
+	cmdline_add_mem(mod_cmdline, elfcorehdr - crash_reserved_mem.start);
+
+	dump_memory_ranges();
+	dbgprintf("kernel command line: \"%s\"\n", mod_cmdline);
+
+	return 0;
+}
+
+#endif
+
--- /dev/null
+++ b/kexec/arch/arm64/include/arch/options.h
@@ -0,0 +1,26 @@
+#ifndef KEXEC_ARCH_ARM64_OPTIONS_H
+#define KEXEC_ARCH_ARM64_OPTIONS_H
+
+//#define OPT_ARCH_MAX	((OPT_MAX)+0)
+
+#define OPT_APPEND	((OPT_MAX)+0)
+#define OPT_RAMDISK	((OPT_MAX)+1)
+#define OPT_DTB		((OPT_MAX)+2)
+
+#define OPT_ARCH_MAX	((OPT_MAX)+3)
+
+
+#define KEXEC_ARCH_OPTIONS \
+	KEXEC_OPTIONS \
+	{ "append",       1, NULL, OPT_APPEND }, \
+	{ "command-line", 1, NULL, OPT_APPEND }, \
+	{ "dtb",          1, NULL, OPT_DTB }, \
+	{ "initrd",       1, NULL, OPT_RAMDISK }, \
+	{ "ramdisk",      1, NULL, OPT_RAMDISK }, \
+
+#define KEXEC_ARCH_OPT_STR KEXEC_OPT_STR /* Only accept long arch options. */
+
+#define KEXEC_ALL_OPTIONS KEXEC_ARCH_OPTIONS
+#define KEXEC_ALL_OPT_STR KEXEC_ARCH_OPT_STR
+
+#endif /* KEXEC_ARCH_ARM64_OPTIONS_H */
--- /dev/null
+++ b/kexec/arch/arm64/kexec-arm64.c
@@ -0,0 +1,177 @@
+/*
+ * ARM64 kexec support.
+ */
+
+#define _GNU_SOURCE
+
+#include <errno.h>
+#include <stddef.h>
+
+//#include <linux/kexec.h>
+
+#include "../../kexec.h"
+#include "../../kexec-syscall.h"
+#include "kexec-arm64.h"
+
+
+void arch_usage(void)
+{
+	fprintf(stderr, "%s:%d: ->\n", __func__, __LINE__);
+
+	printf(
+"     --append=STRING       Set the kernel command line to STRING.\n"
+"     --command-line=STRING Set the kernel command line to STRING.\n"
+"     --dtb=FILE            Use FILE as the device tree blob.\n"
+"     --initrd=FILE         Use FILE as the kernel initial ramdisk.\n"
+"     --ramdisk=FILE        Use FILE as the kernel initial ramdisk.\n");
+
+	fprintf(stderr, "%s:%d: <-\n", __func__, __LINE__);
+}
+
+int arch_process_options(int UNUSED(argc), char **UNUSED(argv))
+{
+	fprintf(stderr, "%s:%d: do\n", __func__, __LINE__);
+	return 0;
+}
+
+const struct arch_map_entry arches[] = {
+	{ "aarch64", KEXEC_ARCH_ARM64 },
+	{ NULL, 0 },
+};
+
+void arch_update_purgatory(struct kexec_info *UNUSED(info))
+{
+	fprintf(stderr, "%s:%d: do\n", __func__, __LINE__);
+}
+
+unsigned long virt_to_phys(unsigned long addr)
+{
+	fprintf(stderr, "%s:%d: %016lx -> %016lx\n", __func__, __LINE__, addr,
+		addr + 0x080000000UL);
+	return addr + 0x080000000UL;
+}
+
+void add_segment(struct kexec_info *info, const void *buf, size_t bufsz,
+	unsigned long base, size_t memsz)
+{
+	fprintf(stderr, "%s:%d: ->\n", __func__, __LINE__);
+	add_segment_phys_virt(info, buf, bufsz, base, memsz, 1);
+	fprintf(stderr, "%s:%d: <-\n", __func__, __LINE__);
+}
+
+static int get_memory_ranges_1(struct memory_range **range, int *ranges,
+			unsigned long kexec_flags)
+{
+	static struct memory_range memory_range[KEXEC_SEGMENT_MAX];
+	const char *iomem;
+	int range_count = 0;
+	char line[MAX_LINE];
+	FILE *fp;
+
+	iomem = proc_iomem();
+	fp = fopen(iomem, "r");
+
+	if (!fp) {
+		fprintf(stderr, "Cannot open %s: %s\n",
+			iomem, strerror(errno));
+		return -1;
+	}
+
+	dbgprintf("memory ranges:\n");
+
+	while(fgets(line, sizeof(line), fp) != 0) {
+		struct memory_range r;
+		char *str;
+		int consumed;
+
+		if (range_count >= KEXEC_SEGMENT_MAX)
+			break;
+
+		if (sscanf(line, "%Lx-%Lx : %n", &r.start, &r.end, &consumed)
+			!= 2)
+			continue;
+
+		str = line + consumed;
+		r.end++;
+
+		if (memcmp(str, "System RAM\n", 11)) {
+			dbgprintf(" Skip: %016Lx - %016Lx : %s", r.start, r.end,
+				str);
+			continue;
+		}
+
+		r.type = RANGE_RAM;
+		memory_range[range_count] = r;
+		range_count++;
+
+		dbgprintf(" Add:  %016Lx - %016Lx : %s", r.start, r.end, str);
+	}
+
+	fclose(fp);
+	*range = memory_range;
+	*ranges = range_count;
+
+	return 0;
+}
+
+static int get_memory_ranges_2(struct memory_range **range, int *ranges,
+		      unsigned long UNUSED(kexec_flags))
+{
+	static struct memory_range memory_range[2];
+
+	memory_range[0].start = 0x080000000;
+	memory_range[0].end   = 0x100000000;
+	memory_range[0].type = RANGE_RAM;
+
+	memory_range[1].start = 0x900000000;
+	memory_range[1].end   = 0x880000000;
+	memory_range[1].type = RANGE_RAM;
+
+	*range = memory_range;
+	*ranges = sizeof(memory_range) / sizeof(memory_range[0]);
+
+	return 0;
+}
+
+int get_memory_ranges(struct memory_range **range, int *ranges,
+			unsigned long kexec_flags)
+{
+	/* FIXME: Should get this info from device tree. */
+	
+	return get_memory_ranges_1(range, ranges, kexec_flags);
+}
+
+struct file_type file_type[] = {
+	{ "elf-arm64", elf_arm64_probe, elf_arm64_load, elf_arm64_usage },
+};
+
+int file_types = sizeof(file_type) / sizeof(file_type[0]);
+
+int arch_compat_trampoline(struct kexec_info *info)
+{
+	fprintf(stderr, "%s:%d: do\n", __func__, __LINE__);
+	return 0;
+}
+
+void arch_reuse_initrd(void)
+{
+}
+
+int machine_verify_elf_rel(struct mem_ehdr *ehdr)
+{
+	(void)ehdr;
+
+	fprintf(stderr, "%s:%d: do\n", __func__, __LINE__);
+	return 0;
+}
+
+void machine_apply_elf_rel(struct mem_ehdr *ehdr, unsigned long r_type,
+	void *location, unsigned long address, unsigned long value)
+{
+	(void)ehdr;
+	(void)r_type;
+	(void)location;
+	(void)address;
+	(void)value;
+	fprintf(stderr, "%s:%d: do\n", __func__, __LINE__);
+}
--- /dev/null
+++ b/kexec/arch/arm64/kexec-arm64.h
@@ -0,0 +1,20 @@
+/*
+ * ARM64 kexec support.
+ */
+
+#if !defined(KEXEC_ARM64_H)
+#define KEXEC_ARM64_H
+
+/* #include <linux/kexec.h> FIXME: this is broken */
+#include <sys/types.h>
+
+#include "../../kexec.h"
+
+#define KEXEC_SEGMENT_MAX 16 /* FIXME: this should come from <linux/kexec.h> */
+
+int elf_arm64_probe(const char *buf, off_t len);
+int elf_arm64_load(int argc, char **argv, const char *buf, off_t len,
+	struct kexec_info *info);
+void elf_arm64_usage(void);
+
+#endif
\ No newline at end of file
--- /dev/null
+++ b/kexec/arch/arm64/kexec-elf-arm64.c
@@ -0,0 +1,114 @@
+/*
+ * ARM64 kexec support.
+ */
+
+#define _GNU_SOURCE
+
+#include <elf.h>
+#include <getopt.h>
+
+#include "../../kexec-syscall.h"
+
+#include "kexec-arm64.h"
+#include "arch/options.h"
+
+#if !defined(EM_AARCH64)
+# define EM_AARCH64 183
+#endif
+
+int elf_arm64_probe(const char *buf, off_t len)
+{
+	int result;
+	struct mem_ehdr ehdr;
+
+	fprintf(stderr, "%s:%d: ->\n", __func__, __LINE__);
+	
+	result = build_elf_exec_info(buf, len, &ehdr, 0);
+
+	if (result < 0) {
+		dbgprintf("Not an ELF executable\n");
+		goto out;
+	}
+
+	if (ehdr.e_machine != EM_AARCH64) {
+		dbgprintf("Not an AARCH64 executable\n");
+		result = -1;
+		goto out;
+	}
+
+	result = 0;
+
+out:
+	free_elf_info(&ehdr);
+	fprintf(stderr, "%s:%d: <-\n", __func__, __LINE__);
+	return result;
+}
+
+int elf_arm64_load(int argc, char **argv, const char *buf, off_t len,
+			struct kexec_info *info)
+{
+	static const struct option options[] = {
+		KEXEC_ARCH_OPTIONS
+		{ 0 }
+	};
+	static const char short_options[] = KEXEC_OPT_STR "";
+	const char *command_line = NULL;
+	unsigned int command_line_len = 0;
+	const char *ramdisk = NULL;
+	const char *dtb = NULL;
+	int opt;
+	struct mem_ehdr ehdr;
+	int result;
+
+	fprintf(stderr, "%s:%d: ->\n", __func__, __LINE__);
+
+	while ((opt = getopt_long(argc, argv, short_options, options, 0))
+		!= -1) {
+		switch (opt) {
+		default:
+			if (opt < OPT_MAX) /* Ignore core options */
+				break;
+		case OPT_APPEND:
+			command_line = optarg;
+			command_line_len = strlen(command_line) + 1;
+			break;
+		case OPT_RAMDISK:
+			ramdisk = optarg;
+			break;
+		case OPT_DTB:
+			dtb = optarg;
+			break;
+		}
+	}
+
+	fprintf(stderr, "%s:%d: command_line: %s\n", __func__, __LINE__, command_line);
+	fprintf(stderr, "%s:%d: ramdisk: %s\n", __func__, __LINE__, ramdisk);
+	fprintf(stderr, "%s:%d: dtb: %s\n", __func__, __LINE__, dtb);
+
+	if (info->kexec_flags & KEXEC_ON_CRASH) {
+		fprintf(stderr, "kexec: kdump not yet supported on arm64\n");
+		return -1;
+	}
+
+	result = build_elf_exec_info(buf, len, &ehdr, 0);
+
+	if (result < 0) {
+		free_elf_info(&ehdr);
+		fprintf(stderr, "%s:%d: free_elf_info failed\n", __func__,
+			__LINE__);
+		return result;
+	}
+
+	elf_exec_build_load(info, &ehdr, buf, len, 0);
+
+	info->entry = (void*)0x80080000UL;  // FIXME
+
+	fprintf(stderr, "%s:%d: <-\n", __func__, __LINE__);
+	return 0;
+}
+
+void elf_arm64_usage(void)
+{
+	fprintf(stderr, "%s:%d: ->\n", __func__, __LINE__);
+	fprintf(stderr, "%s:%d: <-\n", __func__, __LINE__);
+}
--- a/kexec/kexec-syscall.h
+++ b/kexec/kexec-syscall.h
@@ -39,8 +39,8 @@
 #ifdef __s390__
 #define __NR_kexec_load		277
 #endif
-#ifdef __arm__
-#define __NR_kexec_load		__NR_SYSCALL_BASE + 347  
+#if defined(__arm__) || defined(__arm64__)
+#define __NR_kexec_load		__NR_SYSCALL_BASE + 347
 #endif
 #if defined(__mips__)
 #define __NR_kexec_load                4311
@@ -108,6 +108,8 @@ static inline long kexec_file_load(int k
 #define KEXEC_ARCH_PPC64   (21 << 16)
 #define KEXEC_ARCH_IA_64   (50 << 16)
 #define KEXEC_ARCH_ARM     (40 << 16)
+#define KEXEC_ARCH_ARM64   (183 << 16)
+/* #define KEXEC_ARCH_AARCH64 (183 << 16) */
 #define KEXEC_ARCH_S390    (22 << 16)
 #define KEXEC_ARCH_SH      (42 << 16)
 #define KEXEC_ARCH_MIPS_LE (10 << 16)
@@ -153,5 +155,8 @@ static inline long kexec_file_load(int k
 #ifdef __m68k__
 #define KEXEC_ARCH_NATIVE	KEXEC_ARCH_68K
 #endif
+#if defined(__arm64__)
+#define KEXEC_ARCH_NATIVE	KEXEC_ARCH_ARM64
+#endif
 
 #endif /* KEXEC_SYSCALL_H */
--- a/kexec/kexec.c
+++ b/kexec/kexec.c
@@ -664,6 +664,8 @@ static int my_load(const char *type, int
 	memset(&info, 0, sizeof(info));
 	info.kexec_flags = kexec_flags;
 
+	fprintf(stderr, "%s:%d: do\n", __func__, __LINE__);
+
 	result = 0;
 	if (argc - fileind <= 0) {
 		fprintf(stderr, "No kernel specified\n");
--- /dev/null
+++ b/purgatory/arch/arm64/Makefile
@@ -0,0 +1,7 @@
+#
+# Purgatory arm64
+#
+
+arm64_PURGATORY_SRCS =
+
+dist += purgatory/arch/arm64/Makefile $(arm64_PURGATORY_SRCS)
