[PATCH] RISC-V: Add support for riscv kexec/kdump on kexec-tools
Xianting Tian
xianting.tian at linux.alibaba.com
Wed Sep 14 00:52:24 PDT 2022
This patch adds support for loading the ELF kernel image. It parses
the current/provided device tree to determine the system's memory
layout, and /proc/iomem for the various kernel segments.
This patch was firstly developed by Nick Kossifidis, and two fixes (
1: fail to find free memory area for dtb load when using initrd image,
lists.infradead.org/pipermail/linux-riscv/2022-August/018398.html;
2: fix memory range size calculation,
kexec/arch/riscv/crashdump-riscv.c:line 85
) are contributed by Yixun Lan, Xianting Tian.
Tested on Qemu's rv64 virt machine and SoC of T-Head RISC-V Xuantie 910 CPU.
Tested-by: Yixun Lan <yixun.lan at gmail.com>
Signed-off-by: Xianting Tian <xianting.tian at linux.alibaba.com>
Signed-off-by: Yixun Lan <yixun.lan at gmail.com>
Signed-off-by: Nick Kossifidis <mick at ics.forth.gr>
---
configure.ac | 3 +
include/elf.h | 3 +-
kexec/Makefile | 1 +
kexec/arch/riscv/Makefile | 35 ++
kexec/arch/riscv/crashdump-riscv.c | 140 ++++++++
kexec/arch/riscv/include/arch/options.h | 43 +++
kexec/arch/riscv/kexec-elf-riscv.c | 255 ++++++++++++++
kexec/arch/riscv/kexec-riscv.c | 365 +++++++++++++++++++
kexec/arch/riscv/kexec-riscv.h | 32 ++
kexec/dt-ops.c | 442 +++++++++++++++++++++++-
kexec/dt-ops.h | 7 +
kexec/kexec-syscall.h | 4 +
purgatory/Makefile | 1 +
purgatory/arch/riscv/Makefile | 7 +
14 files changed, 1336 insertions(+), 2 deletions(-)
create mode 100644 kexec/arch/riscv/Makefile
create mode 100644 kexec/arch/riscv/crashdump-riscv.c
create mode 100644 kexec/arch/riscv/include/arch/options.h
create mode 100644 kexec/arch/riscv/kexec-elf-riscv.c
create mode 100644 kexec/arch/riscv/kexec-riscv.c
create mode 100644 kexec/arch/riscv/kexec-riscv.h
create mode 100644 purgatory/arch/riscv/Makefile
diff --git a/configure.ac b/configure.ac
index 0d825ef..7cc55b0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -58,6 +58,9 @@ case $target_cpu in
hppa*)
ARCH="hppa"
;;
+ riscv32|riscv64 )
+ ARCH="riscv"
+ ;;
* )
AC_MSG_ERROR([unsupported architecture $target_cpu])
;;
diff --git a/include/elf.h b/include/elf.h
index b7677a2..123f167 100644
--- a/include/elf.h
+++ b/include/elf.h
@@ -259,7 +259,8 @@ typedef struct
#define EM_ARC_A5 93 /* ARC Cores Tangent-A5 */
#define EM_XTENSA 94 /* Tensilica Xtensa Architecture */
#define EM_AARCH64 183 /* ARM AARCH64 */
-#define EM_NUM 184
+#define EM_RISCV 243 /* RISC-V */
+#define EM_NUM 244
/* If it is necessary to assign new unofficial EM_* values, please
pick large random numbers (0x8523, 0xa7f2, etc.) to minimize the
diff --git a/kexec/Makefile b/kexec/Makefile
index e69e309..ca17831 100644
--- a/kexec/Makefile
+++ b/kexec/Makefile
@@ -88,6 +88,7 @@ include $(srcdir)/kexec/arch/mips/Makefile
include $(srcdir)/kexec/arch/cris/Makefile
include $(srcdir)/kexec/arch/ppc/Makefile
include $(srcdir)/kexec/arch/ppc64/Makefile
+include $(srcdir)/kexec/arch/riscv/Makefile
include $(srcdir)/kexec/arch/s390/Makefile
include $(srcdir)/kexec/arch/sh/Makefile
include $(srcdir)/kexec/arch/x86_64/Makefile
diff --git a/kexec/arch/riscv/Makefile b/kexec/arch/riscv/Makefile
new file mode 100644
index 0000000..f26cc90
--- /dev/null
+++ b/kexec/arch/riscv/Makefile
@@ -0,0 +1,35 @@
+#
+# kexec riscv
+#
+riscv_KEXEC_SRCS = kexec/arch/riscv/kexec-riscv.c
+riscv_KEXEC_SRCS += kexec/arch/riscv/kexec-elf-riscv.c
+riscv_KEXEC_SRCS += kexec/arch/riscv/crashdump-riscv.c
+
+riscv_MEM_REGIONS = kexec/mem_regions.c
+
+riscv_DT_OPS += kexec/dt-ops.c
+
+riscv_ARCH_REUSE_INITRD =
+
+riscv_CPPFLAGS += -I $(srcdir)/kexec/
+
+dist += kexec/arch/riscv/Makefile $(riscv_KEXEC_SRCS) \
+ kexec/arch/riscv/kexec-riscv.h \
+ kexec/arch/riscv/include/arch/options.h
+
+ifdef HAVE_LIBFDT
+
+LIBS += -lfdt
+
+else
+
+include $(srcdir)/kexec/libfdt/Makefile.libfdt
+
+libfdt_SRCS += $(LIBFDT_SRCS:%=kexec/libfdt/%)
+
+riscv_CPPFLAGS += -I$(srcdir)/kexec/libfdt
+
+riscv_KEXEC_SRCS += $(libfdt_SRCS)
+
+endif
+
diff --git a/kexec/arch/riscv/crashdump-riscv.c b/kexec/arch/riscv/crashdump-riscv.c
new file mode 100644
index 0000000..3ed4fe3
--- /dev/null
+++ b/kexec/arch/riscv/crashdump-riscv.c
@@ -0,0 +1,140 @@
+#include <errno.h>
+#include <linux/elf.h>
+#include <unistd.h>
+
+#include "kexec.h"
+#include "crashdump.h"
+#include "kexec-elf.h"
+#include "mem_regions.h"
+
+static struct crash_elf_info elf_info = {
+#if __riscv_xlen == 64
+ .class = ELFCLASS64,
+#else
+ .class = ELFCLASS32,
+#endif
+ .data = ELFDATA2LSB,
+ .machine = EM_RISCV,
+};
+
+static struct memory_ranges crash_mem_ranges = {0};
+struct memory_range elfcorehdr_mem = {0};
+
+static unsigned long long get_page_offset(struct kexec_info *info)
+{
+ unsigned long long vaddr_off = 0;
+ unsigned long long page_size = sysconf(_SC_PAGESIZE);
+ unsigned long long init_start = get_kernel_sym("_sinittext");
+
+ /*
+ * Begining of init section is aligned to page size
+ */
+ vaddr_off = init_start - page_size;
+
+ return vaddr_off;
+}
+
+int load_elfcorehdr(struct kexec_info *info)
+{
+ struct memory_range crashkern_range = {0};
+ struct memory_range *ranges = NULL;
+ unsigned long start = 0;
+ unsigned long end = 0;
+ unsigned long buf_size = 0;
+ unsigned long elfcorehdr_addr = 0;
+ void* buf = NULL;
+ int i = 0;
+ int ret = 0;
+
+ ret = parse_iomem_single("Kernel code\n", &start, NULL);
+ if (ret) {
+ fprintf(stderr, "Cannot determine kernel physical base addr\n");
+ return -EINVAL;
+ }
+ elf_info.kern_paddr_start = start;
+
+ ret = parse_iomem_single("Kernel bss\n", NULL, &end);
+ if (ret) {
+ fprintf(stderr, "Cannot determine kernel physical bss addr\n");
+ return -EINVAL;
+ }
+ elf_info.kern_paddr_start = start;
+ elf_info.kern_size = end - start;
+
+ elf_info.kern_vaddr_start = get_kernel_sym("_text");
+ if (!elf_info.kern_vaddr_start) {
+ elf_info.kern_vaddr_start = UINT64_MAX;
+ }
+
+ elf_info.page_offset = get_page_offset(info);
+ dbgprintf("page_offset: %016llx\n", elf_info.page_offset);
+
+ ret = parse_iomem_single("Crash kernel\n", &start, &end);
+ if (ret) {
+ fprintf(stderr, "Cannot determine kernel physical bss addr\n");
+ return -EINVAL;
+ }
+ crashkern_range.start = start;
+ crashkern_range.end = end;
+ crashkern_range.type = RANGE_RESERVED;
+
+ ranges = info->memory_range;
+ for (i = 0; i < info->memory_ranges; i++) {
+ ret = mem_regions_alloc_and_add(&crash_mem_ranges,
+ ranges[i].start,
+ ranges[i].end - ranges[i].start + 1,
+ ranges[i].type);
+ if (ret ) {
+ fprintf(stderr, "Could not create crash_mem_ranges\n");
+ return ret;
+ }
+ }
+
+ ret = mem_regions_alloc_and_exclude(&crash_mem_ranges,
+ &crashkern_range);
+ if (ret) {
+ fprintf(stderr, "Could not exclude crashkern_range\n");
+ return ret;
+ }
+
+#if __riscv_xlen == 64
+ crash_create_elf64_headers(info, &elf_info, crash_mem_ranges.ranges,
+ crash_mem_ranges.size, &buf, &buf_size,
+ ELF_CORE_HEADER_ALIGN);
+
+#else
+ crash_create_elf32_headers(info, &elf_info, crash_mem_ranges.ranges,
+ crash_mem_ranges.size, &buf, &buf_size,
+ ELF_CORE_HEADER_ALIGN);
+#endif
+
+
+ elfcorehdr_addr = add_buffer_phys_virt(info, buf, buf_size,
+ buf_size, 0,
+ crashkern_range.start,
+ crashkern_range.end,
+ -1, 0);
+
+ elfcorehdr_mem.start = elfcorehdr_addr;
+ elfcorehdr_mem.end = elfcorehdr_addr + buf_size - 1;
+
+ dbgprintf("%s: elfcorehdr 0x%llx-0x%llx\n", __func__,
+ elfcorehdr_mem.start, elfcorehdr_mem.end);
+
+ return 0;
+}
+
+int is_crashkernel_mem_reserved(void)
+{
+ uint64_t start = 0;
+ uint64_t end = 0;
+
+ return parse_iomem_single("Crash kernel\n", &start, &end) == 0 ?
+ (start != end) : 0;
+}
+
+int get_crash_kernel_load_range(uint64_t *start, uint64_t *end)
+{
+ return parse_iomem_single("Crash kernel\n", start, end);
+}
+
diff --git a/kexec/arch/riscv/include/arch/options.h b/kexec/arch/riscv/include/arch/options.h
new file mode 100644
index 0000000..7c24184
--- /dev/null
+++ b/kexec/arch/riscv/include/arch/options.h
@@ -0,0 +1,43 @@
+#ifndef KEXEC_ARCH_RISCV_OPTIONS_H
+#define KEXEC_ARCH_RISCV_OPTIONS_H
+
+#define OPT_APPEND ((OPT_MAX)+0)
+#define OPT_DTB ((OPT_MAX)+1)
+#define OPT_INITRD ((OPT_MAX)+2)
+#define OPT_CMDLINE ((OPT_MAX)+3)
+#define OPT_REUSE_CMDLINE ((OPT_MAX)+4)
+#define OPT_ARCH_MAX ((OPT_MAX)+5)
+
+/* Options relevant to the architecture (excluding loader-specific ones),
+ * in this case none:
+ */
+#define KEXEC_ARCH_OPTIONS \
+ KEXEC_OPTIONS \
+ { "append", 1, 0, OPT_APPEND}, \
+ { "dtb", 1, 0, OPT_DTB }, \
+ { "initrd", 1, 0, OPT_INITRD }, \
+ { "command-line", 1, 0, OPT_CMDLINE}, \
+ { "reuse-cmdline", 0, NULL, OPT_REUSE_CMDLINE }, \
+
+
+#define KEXEC_ARCH_OPT_STR KEXEC_OPT_STR ""
+
+/* The following two #defines list ALL of the options added by all of the
+ * architecture's loaders.
+ * o main() uses this complete list to scan for its options, ignoring
+ * arch-specific/loader-specific ones.
+ * o Then, arch_process_options() uses this complete list to scan for its
+ * options, ignoring general/loader-specific ones.
+ * o Then, the file_type[n].load re-scans for options, using
+ * KEXEC_ARCH_OPTIONS plus its loader-specific options subset.
+ * Any unrecognised options cause an error here.
+ *
+ * This is done so that main()'s/arch_process_options()'s getopt_long() calls
+ * don't choose a kernel filename from random arguments to options they don't
+ * recognise -- as they now recognise (if not act upon) all possible options.
+ */
+#define KEXEC_ALL_OPTIONS KEXEC_ARCH_OPTIONS
+
+#define KEXEC_ALL_OPT_STR KEXEC_ARCH_OPT_STR
+
+#endif /* KEXEC_ARCH_RISCV_OPTIONS_H */
diff --git a/kexec/arch/riscv/kexec-elf-riscv.c b/kexec/arch/riscv/kexec-elf-riscv.c
new file mode 100644
index 0000000..f3c011c
--- /dev/null
+++ b/kexec/arch/riscv/kexec-elf-riscv.c
@@ -0,0 +1,255 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2019 FORTH-ICS/CARV
+ * Nick Kossifidis <mick at ics.forth.gr>
+ */
+
+#include "kexec.h"
+#include "dt-ops.h" /* For dtb_set/clear_initrd() */
+#include <elf.h> /* For ELF header handling */
+#include <errno.h> /* For EFBIG/EINVAL */
+#include <unistd.h> /* For getpagesize() */
+#include "kexec-syscall.h" /* For KEXEC_ON_CRASH */
+#include "kexec-riscv.h"
+
+
+/*********\
+* HELPERS *
+\*********/
+
+/*
+ * Go through the available physical memory regions and
+ * find one that can hold an image of the specified size.
+ * Note: This is called after get_memory_ranges so
+ * info->memory_range[] should be populated. Also note that
+ * memory ranges are sorted, so we'll return the first region
+ * that's big enough for holding the image.
+ */
+static int elf_riscv_find_pbase(struct kexec_info *info, off_t *addr,
+ off_t size)
+{
+ int i = 0;
+ off_t start = 0;
+ off_t end = 0;
+ int ret = 0;
+
+ /*
+ * If this image is for a crash kernel, use the region
+ * the primary kernel has already reserved for us.
+ */
+ if (info->kexec_flags & KEXEC_ON_CRASH) {
+ ret = get_crash_kernel_load_range((uint64_t *) &start,
+ (uint64_t *) &end);
+ if (!ret) {
+ /*
+ * Kernel should be aligned to the nearest
+ * hugepage (2MB for RV64, 4MB for RV32).
+ */
+#if __riscv_xlen == 64
+ start = _ALIGN_UP(start, 0x200000);
+#else
+ start = _ALIGN_UP(start, 0x400000);
+#endif
+ if (end > start && ((end - start) >= size)) {
+ *addr = start;
+ return 0;
+ }
+
+ return -EFBIG;
+ } else
+ return ENOCRASHKERNEL;
+ }
+
+ for (i = 0; i < info->memory_ranges; i++) {
+ if (info->memory_range[i].type != RANGE_RAM)
+ continue;
+
+ start = info->memory_range[i].start;
+ end = info->memory_range[i].end;
+
+#if __riscv_xlen == 64
+ start = _ALIGN_UP(start, 0x200000);
+#else
+ start = _ALIGN_UP(start, 0x400000);
+#endif
+
+ if (end > start && ((end - start) >= size)) {
+ *addr = start;
+ return 0;
+ }
+ }
+
+ return -EFBIG;
+}
+
+/**************\
+* ENTRY POINTS *
+\**************/
+
+int elf_riscv_probe(const char *buf, off_t len)
+{
+ struct mem_ehdr ehdr = {0};
+ int ret = 0;
+
+ ret = build_elf_exec_info(buf, len, &ehdr, 0);
+ if (ret < 0)
+ goto cleanup;
+
+ if (ehdr.e_machine != EM_RISCV) {
+ fprintf(stderr, "Not for this architecture.\n");
+ ret = -EINVAL;
+ goto cleanup;
+ }
+
+ ret = 0;
+
+ cleanup:
+ free_elf_info(&ehdr);
+ return ret;
+}
+
+void elf_riscv_usage(void)
+{
+}
+
+int elf_riscv_load(int argc, char **argv, const char *buf, off_t len,
+ struct kexec_info *info)
+{
+ struct mem_ehdr ehdr = {0};
+ struct mem_phdr *phdr = NULL;
+ off_t new_base_addr = 0;
+ off_t kernel_size = 0;
+ off_t page_size = getpagesize();
+ off_t max_addr = 0;
+ off_t old_base_addr = 0;
+ off_t old_start_addr = 0;
+ int i = 0;
+ int ret = 0;
+
+ if (info->file_mode) {
+ fprintf(stderr, "kexec_file not supported on this "
+ "architecture\n");
+ return -EINVAL;
+ }
+
+ /* Parse the ELF file */
+ ret = build_elf_exec_info(buf, len, &ehdr, 0);
+ if (ret < 0) {
+ fprintf(stderr, "ELF exec parse failed\n");
+ return -EINVAL;
+ }
+
+ max_addr = elf_max_addr(&ehdr);
+ old_base_addr = max_addr;
+ old_start_addr = max_addr;
+
+ /*
+ * Get the memory footprint, base physical
+ * and start address of the ELF image
+ */
+ for (i = 0; i < ehdr.e_phnum; i++) {
+ phdr = &ehdr.e_phdr[i];
+ if (phdr->p_type != PT_LOAD)
+ continue;
+
+ /*
+ * Note: According to ELF spec the loadable regions
+ * are sorted on p_vaddr, not p_paddr.
+ */
+ if (old_base_addr > phdr->p_paddr)
+ old_base_addr = phdr->p_paddr;
+
+ if (phdr->p_vaddr == ehdr.e_entry ||
+ phdr->p_paddr == ehdr.e_entry)
+ old_start_addr = phdr->p_paddr;
+
+ kernel_size += _ALIGN_UP(phdr->p_memsz, page_size);
+ }
+
+ if (old_base_addr == max_addr || kernel_size == 0) {
+ fprintf(stderr, "No loadable segments present on the "
+ "provided ELF image\n");
+ return -EINVAL;
+ }
+
+ if (old_start_addr == max_addr) {
+ fprintf(stderr, "Could not find the entry point address of "
+ "provided ELF image\n");
+ return -EINVAL;
+ }
+
+ dbgprintf("Got ELF with total memsz %luKB\n"
+ "Base paddr: 0x%lX, start_addr: 0x%lX\n",
+ kernel_size / 1024, old_base_addr, old_start_addr);
+
+ /* Get a continuous physical region that can hold the kernel */
+ ret = elf_riscv_find_pbase(info, &new_base_addr, kernel_size);
+ if (ret < 0) {
+ fprintf(stderr, "Could not find a memory region for the "
+ "provided ELF image\n");
+ return ret;
+ }
+
+ dbgprintf("New base paddr for the ELF: 0x%lX\n", new_base_addr);
+
+ /* Re-set the base physical address of the ELF */
+ for (i = 0; i < ehdr.e_phnum; i++) {
+ phdr = &ehdr.e_phdr[i];
+ if (phdr->p_type != PT_LOAD)
+ continue;
+
+ phdr->p_paddr -= old_base_addr;
+ phdr->p_paddr += new_base_addr;
+ }
+
+ /* Re-set the entry point address */
+ ehdr.e_entry = (old_start_addr - old_base_addr) + new_base_addr;
+ info->entry = (void *) ehdr.e_entry;
+ dbgprintf("New entry point for the ELF: 0x%llX\n", ehdr.e_entry);
+
+
+ /* Load the ELF executable */
+ ret = elf_exec_load(&ehdr, info);
+ if (ret < 0) {
+ fprintf(stderr, "ELF exec load failed\n");
+ return ret;
+ }
+
+ ret = load_extra_segments(info, new_base_addr,
+ kernel_size, max_addr);
+ return ret;
+}
+
+
+/*******\
+* STUBS *
+\*******/
+
+int machine_verify_elf_rel(struct mem_ehdr *ehdr)
+{
+ if (ehdr->ei_data != ELFDATA2LSB)
+ return 0;
+#if __riscv_xlen == 64
+ if (ehdr->ei_class != ELFCLASS64)
+#else
+ if (ehdr->ei_class != ELFCLASS32)
+#endif
+ return 0;
+ if (ehdr->e_machine != EM_RISCV)
+ return 0;
+ return 1;
+}
+
+void machine_apply_elf_rel(struct mem_ehdr *UNUSED(ehdr),
+ struct mem_sym *UNUSED(sym),
+ unsigned long r_type,
+ void *UNUSED(location),
+ unsigned long UNUSED(address),
+ unsigned long UNUSED(value))
+{
+ switch (r_type) {
+ default:
+ die("Unknown rela relocation: %lu\n", r_type);
+ break;
+ }
+}
diff --git a/kexec/arch/riscv/kexec-riscv.c b/kexec/arch/riscv/kexec-riscv.c
new file mode 100644
index 0000000..fe5dd2d
--- /dev/null
+++ b/kexec/arch/riscv/kexec-riscv.c
@@ -0,0 +1,365 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2019 FORTH-ICS/CARV
+ * Nick Kossifidis <mick at ics.forth.gr>
+ */
+
+#include "kexec-syscall.h" /* For KEXEC_ARCH_RISCV */
+#include "kexec.h" /* For OPT_MAX and concat_cmdline() */
+#include "mem_regions.h" /* For mem_regions_sort() */
+#include "dt-ops.h" /* For dtb_set_bootargs() */
+#include <arch/options.h> /* For KEXEC_ARCH_OPTIONS */
+#include <getopt.h> /* For struct option */
+#include <sys/stat.h> /* For stat() and struct stat */
+#include <stdlib.h> /* For free() */
+#include <errno.h> /* For EINVAL */
+#include <libfdt.h> /* For DeviceTree handling */
+#include "kexec-riscv.h"
+
+const struct arch_map_entry arches[] = {
+ { "riscv32", KEXEC_ARCH_RISCV },
+ { "riscv64", KEXEC_ARCH_RISCV },
+ { NULL, 0 },
+};
+
+
+struct file_type file_type[] = {
+ {"elf-riscv", elf_riscv_probe, elf_riscv_load, elf_riscv_usage},
+};
+int file_types = sizeof(file_type) / sizeof(file_type[0]);
+
+static const char riscv_opts_usage[] =
+" --append=STRING Append STRING to the kernel command line.\n"
+" --dtb=FILE Use FILE as the device tree blob.\n"
+" --initrd=FILE Use FILE as the kernel initial ramdisk.\n"
+" --cmdline=STRING Use STRING as the kernel's command line.\n"
+" --reuse-cmdline Use kernel command line from running system.\n";
+
+static struct riscv_opts arch_options = {0};
+static struct fdt_image provided_fdt = {0};
+static struct memory_ranges sysmem_ranges = {0};
+
+/****************\
+* COMMON HELPERS *
+\****************/
+
+int load_extra_segments(struct kexec_info *info, uint64_t kernel_base,
+ uint64_t kernel_size, uint64_t max_addr)
+{
+ struct fdt_image *fdt = arch_options.fdt;
+ char *initrd_buf = NULL;
+ off_t initrd_size = 0;
+ uint64_t initrd_base = 0;
+ uint64_t start = 0;
+ uint64_t end = 0;
+ uint64_t min_usable = kernel_base + kernel_size;
+ uint64_t max_usable = max_addr;
+ int ret = 0;
+
+ /* Prepare the device tree */
+ if (info->kexec_flags & KEXEC_ON_CRASH) {
+ ret = load_elfcorehdr(info);
+ if (ret) {
+ fprintf(stderr, "Couldn't create elfcorehdr\n");
+ return ret;
+ }
+
+ ret = dtb_add_range_property(&fdt->buf, &fdt->size,
+ elfcorehdr_mem.start, elfcorehdr_mem.end,
+ "chosen", "linux,elfcorehdr");
+ if (ret) {
+ fprintf(stderr, "Couldn't add elfcorehdr to fdt\n");
+ return ret;
+ }
+
+ ret = get_crash_kernel_load_range(&start, &end);
+ if (ret) {
+ fprintf(stderr, "Couldn't get crashkenel region\n");
+ return ret;
+ }
+
+ ret = dtb_add_range_property(&fdt->buf, &fdt->size, start, end,
+ "memory", "linux,usable-memory");
+ if (ret) {
+ fprintf(stderr, "Couldn't add usable-memory to fdt\n");
+ return ret;
+ }
+
+ max_usable = end;
+ } else {
+ /*
+ * Make sure we remove elfcorehdr and usable-memory
+ * when switching from crash kernel to a normal one.
+ */
+ dtb_delete_property(fdt->buf, "chosen", "linux,elfcorehdr");
+ dtb_delete_property(fdt->buf, "memory", "linux,usable-memory");
+ }
+
+ /* Do we need to include an initrd image ? */
+ if (!arch_options.initrd_path && !arch_options.initrd_end)
+ dtb_clear_initrd(&fdt->buf, &fdt->size);
+ else if (arch_options.initrd_path) {
+ if (arch_options.initrd_end)
+ fprintf(stderr, "Warning: An initrd image was provided"
+ ", will ignore reuseinitrd\n");
+
+ initrd_buf = slurp_file(arch_options.initrd_path,
+ &initrd_size);
+ if (!initrd_buf) {
+ fprintf(stderr, "Couldn't read provided initrd\n");
+ return -EINVAL;
+ }
+
+ initrd_base = add_buffer_phys_virt(info, initrd_buf,
+ initrd_size,
+ initrd_size, 0,
+ min_usable,
+ max_usable, -1, 0);
+
+ dtb_set_initrd(&fdt->buf, &fdt->size, initrd_base,
+ initrd_base + initrd_size);
+
+ dbgprintf("Base addr for initrd image: 0x%lX\n", initrd_base);
+ min_usable = initrd_base;
+ max_usable = initrd_base;
+ }
+
+ /* Add device tree */
+ add_buffer_phys_virt(info, fdt->buf, fdt->size, fdt->size, 0,
+ min_usable, max_usable, -1, 0);
+
+ return 0;
+}
+
+
+/**************\
+* ENTRY POINTS *
+\**************/
+
+void arch_usage(void)
+{
+ printf(riscv_opts_usage);
+}
+
+int arch_process_options(int argc, char **argv)
+{
+ static const struct option options[] = {
+ KEXEC_ARCH_OPTIONS
+ { 0 },
+ };
+ static const char short_options[] = KEXEC_ARCH_OPT_STR;
+ struct stat st = {0};
+ char *append = NULL;
+ char *cmdline = NULL;
+ void *tmp = NULL;
+ off_t tmp_size = 0;
+ int opt = 0;
+ int ret = 0;
+
+ while ((opt = getopt_long(argc, argv, short_options,
+ options, 0)) != -1) {
+ switch (opt) {
+ case OPT_APPEND:
+ append = optarg;
+ break;
+ case OPT_CMDLINE:
+ if (cmdline)
+ fprintf(stderr,
+ "Warning: Kernel's cmdline "
+ "set twice !\n");
+ cmdline = optarg;
+ break;
+ case OPT_REUSE_CMDLINE:
+ if (cmdline)
+ fprintf(stderr,
+ "Warning: Kernel's cmdline "
+ "set twice !\n");
+ cmdline = get_command_line();
+ break;
+ case OPT_DTB:
+ ret = stat(optarg, &st);
+ if (ret) {
+ fprintf(stderr,
+ "Could not find the provided dtb !\n");
+ return -EINVAL;
+ }
+ arch_options.fdt_path = optarg;
+ break;
+ case OPT_INITRD:
+ ret = stat(optarg, &st);
+ if (ret) {
+ fprintf(stderr,
+ "Could not find the provided "
+ "initrd image !\n");
+ return -EINVAL;
+ }
+ arch_options.initrd_path = optarg;
+ break;
+ default:
+ break;
+ }
+ }
+
+ /* Handle Kernel's command line */
+ if (append && !cmdline)
+ fprintf(stderr, "Warning: No cmdline provided, "
+ "using append string as cmdline\n");
+ if (!append && !cmdline)
+ fprintf(stderr, "Warning: No cmdline or append string "
+ "provided\n");
+
+ if (append || cmdline)
+ /*
+ * Note that this also handles the case where "cmdline"
+ * or "append" is NULL.
+ */
+ arch_options.cmdline = concat_cmdline(cmdline, append);
+
+ /* Handle FDT image */
+ if (!arch_options.fdt_path) {
+ ret = stat("/sys/firmware/fdt", &st);
+ if (ret) {
+ fprintf(stderr, "No dtb provided and "
+ "/sys/firmware/fdt is not present\n");
+ return -EINVAL;
+ }
+ fprintf(stderr, "Warning: No dtb provided, "
+ "using /sys/firmware/fdt\n");
+ arch_options.fdt_path = "/sys/firmware/fdt";
+ }
+
+ tmp = slurp_file(arch_options.fdt_path, &tmp_size);
+ if (!tmp) {
+ fprintf(stderr, "Couldn't read provided fdt\n");
+ return -EINVAL;
+ }
+
+ ret = fdt_check_header(tmp);
+ if (ret) {
+ fprintf(stderr, "Got an ivalid fdt image !\n");
+ free(tmp);
+ return -EINVAL;
+ }
+ provided_fdt.buf = tmp;
+ provided_fdt.size = tmp_size;
+
+ if (arch_options.cmdline) {
+ ret = dtb_set_bootargs(&provided_fdt.buf, &provided_fdt.size,
+ arch_options.cmdline);
+ if (ret < 0) {
+ fprintf(stderr, "Could not set bootargs on "
+ "the fdt image\n");
+ return ret;
+ }
+ }
+
+ arch_options.fdt = &provided_fdt;
+
+ return 0;
+}
+
+/*
+ * This one is called after arch_process_options so we already
+ * have an fdt image in place.
+ */
+void arch_reuse_initrd(void)
+{
+ const uint32_t *prop32 = NULL;
+ uint32_t addr_cells = 0;
+ const void *prop = 0;
+ int prop_size = 0;
+ uint64_t initrd_start = 0;
+ uint64_t initrd_end = 0;
+ int chosen_offset = 0;
+ struct fdt_image *fdt = &provided_fdt;
+
+ chosen_offset = fdt_subnode_offset(fdt->buf, 0, "chosen");
+ if (chosen_offset < 0) {
+ fprintf(stderr, "No /chosen node found on fdt image "
+ "unable to reuse initrd\n");
+ return;
+ }
+
+ prop32 = fdt_getprop(fdt->buf, 0, "#address-cells", NULL);
+ if (!prop32) {
+ fprintf(stderr, "No #address-cells property on root node\n");
+ return;
+ }
+ addr_cells = be32_to_cpu(*prop32);
+
+ prop = fdt_getprop(fdt->buf, chosen_offset,
+ "linux,initrd-start", &prop_size);
+ if (!prop) {
+ fprintf(stderr, "Could not get linux,initrd-start\n");
+ return;
+ }
+ dtb_extract_int_property(&initrd_start, prop, addr_cells);
+
+ prop = fdt_getprop(fdt->buf, chosen_offset,
+ "linux,initrd-end", &prop_size);
+ if (!prop) {
+ fprintf(stderr, "Could not get linux,initrd-end\n");
+ return;
+ }
+ dtb_extract_int_property(&initrd_end, prop, addr_cells);
+
+ arch_options.initrd_start = initrd_start;
+ arch_options.initrd_end = initrd_end;
+ dbgprintf("initrd_start: 0x%lX, initrd_end: 0x%lX\n",
+ initrd_start, initrd_end);
+
+}
+
+int get_memory_ranges(struct memory_range **range, int *num_ranges,
+ unsigned long kexec_flags)
+{
+ const struct fdt_image *fdt = &provided_fdt;
+ struct memory_ranges *extra_ranges = NULL;
+ int i = 0;
+ int ret = 0;
+
+ if (arch_options.initrd_start && arch_options.initrd_end) {
+ int initrd_size = arch_options.initrd_end - arch_options.initrd_start;
+ dbgprintf("Marking current intird image as reserved\n");
+ ret = mem_regions_alloc_and_add(extra_ranges,
+ arch_options.initrd_start,
+ initrd_size,
+ RANGE_RESERVED);
+ if (ret)
+ return ret;
+ }
+
+ ret = dtb_get_memory_ranges(fdt->buf, &sysmem_ranges, extra_ranges);
+ if (ret) {
+ fprintf(stderr, "Could not get memory ranges from device tree (%i) !\n", ret);
+ return ret;
+ }
+
+ *range = sysmem_ranges.ranges;
+ *num_ranges = sysmem_ranges.size;
+
+ dbgprintf("Memory regions:\n");
+ for (i = 0; i < sysmem_ranges.size; i++) {
+ dbgprintf("\t0x%llx - 0x%llx : %s (%i)\n",
+ sysmem_ranges.ranges[i].start,
+ sysmem_ranges.ranges[i].end,
+ sysmem_ranges.ranges[i].type == RANGE_RESERVED ?
+ "RANGE_RESERVED" : "RANGE_RAM",
+ sysmem_ranges.ranges[i].type);
+ }
+
+ return 0;
+}
+
+/*******\
+* STUBS *
+\*******/
+
+int arch_compat_trampoline(struct kexec_info *UNUSED(info))
+{
+ return 0;
+}
+
+void arch_update_purgatory(struct kexec_info *UNUSED(info))
+{
+}
diff --git a/kexec/arch/riscv/kexec-riscv.h b/kexec/arch/riscv/kexec-riscv.h
new file mode 100644
index 0000000..c4323a6
--- /dev/null
+++ b/kexec/arch/riscv/kexec-riscv.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2019 FORTH-ICS/CARV
+ * Nick Kossifidis <mick at ics.forth.gr>
+ */
+
+struct fdt_image {
+ char *buf;
+ off_t size;
+};
+
+struct riscv_opts {
+ char *cmdline;
+ char *fdt_path;
+ char *initrd_path;
+ uint64_t initrd_start;
+ uint64_t initrd_end;
+ struct fdt_image *fdt;
+};
+
+/* crashdump-riscv.c */
+extern struct memory_range elfcorehdr_mem;
+int load_elfcorehdr(struct kexec_info *info);
+
+/* kexec-riscv.c */
+int load_extra_segments(struct kexec_info *info, uint64_t kernel_base,
+ uint64_t kernel_size, uint64_t max_addr);
+
+int elf_riscv_probe(const char *buf, off_t len);
+void elf_riscv_usage(void);
+int elf_riscv_load(int argc, char **argv, const char *buf, off_t len,
+ struct kexec_info *info);
diff --git a/kexec/dt-ops.c b/kexec/dt-ops.c
index 0a96b75..3e285ab 100644
--- a/kexec/dt-ops.c
+++ b/kexec/dt-ops.c
@@ -4,9 +4,11 @@
#include <libfdt.h>
#include <stdio.h>
#include <stdlib.h>
+#include <stdbool.h>
#include "kexec.h"
#include "dt-ops.h"
+#include "mem_regions.h"
static const char n_chosen[] = "chosen";
@@ -95,7 +97,7 @@ int dtb_set_property(char **dtb, off_t *dtb_size, const char *node,
strcpy(new_node, "/");
strcat(new_node, node);
-
+
nodeoffset = fdt_path_offset(new_dtb, new_node);
if (nodeoffset == -FDT_ERR_NOTFOUND) {
@@ -174,3 +176,441 @@ int dtb_delete_property(char *dtb, const char *node, const char *prop)
free(new_node);
return result;
}
+
+static int dtb_get_num_cells(char *dtb, int nodeoffset, uint32_t *addr_cells,
+ uint32_t *size_cells, bool recursive)
+{
+ const uint32_t *prop32 = NULL;
+ int curr_offset = nodeoffset;
+ int prop_len = 0;
+ *addr_cells = 0;
+ *size_cells = 0;
+
+ do {
+ prop32 = fdt_getprop(dtb, curr_offset, "#address-cells", &prop_len);
+ curr_offset = fdt_parent_offset(dtb, curr_offset);
+ } while (!prop32 && prop_len == -FDT_ERR_NOTFOUND && recursive);
+
+ if (!prop32) {
+ dbgprintf("Could not get #address-cells property for %s (%s)\n",
+ fdt_get_name(dtb, nodeoffset, NULL), fdt_strerror(nodeoffset));
+ return -EINVAL;
+ }
+ *addr_cells = fdt32_to_cpu(*prop32);
+
+ curr_offset = nodeoffset;
+ do {
+ prop32 = fdt_getprop(dtb, curr_offset, "#size-cells", &prop_len);
+ curr_offset = fdt_parent_offset(dtb, curr_offset);
+ } while (!prop32 && prop_len == -FDT_ERR_NOTFOUND && recursive);
+
+ if (!prop32) {
+ dbgprintf("Could not get #size-cells property for %s (%s)\n",
+ fdt_get_name(dtb, nodeoffset, NULL), fdt_strerror(nodeoffset));
+ return -EINVAL;
+ }
+ *size_cells = fdt32_to_cpu(*prop32);
+
+ dbgprintf("%s: #address-cells:%d #size-cells:%d\n",
+ fdt_get_name(dtb, nodeoffset, NULL), *addr_cells, *size_cells);
+
+ return 0;
+}
+
+void dtb_extract_int_property(uint64_t *val, const void *buf, uint32_t cells)
+{
+ const uint32_t *prop32 = NULL;
+ const uint64_t *prop64 = NULL;
+
+ if (cells == 1) {
+ prop32 = (const uint32_t *) buf;
+ *val = (uint64_t) be32_to_cpu(*prop32);
+ } else {
+ /* Skip any leading cells */
+ prop64 = (const uint64_t *) (uint32_t *)buf + cells - 2;
+ *val = (uint64_t) be64_to_cpu(*prop64);
+ }
+}
+
+void dtb_fill_int_property(void *buf, uint64_t val, uint32_t cells)
+{
+ uint32_t prop32 = 0;
+ uint64_t prop64 = 0;
+
+ if (cells == 1) {
+ prop32 = cpu_to_fdt32((uint32_t) val);
+ memcpy(buf, &prop32, sizeof(uint32_t));
+ } else {
+ prop64 = cpu_to_fdt64(val);
+ /* Skip any leading cells */
+ memcpy((uint64_t *)(uint32_t *)buf + cells - 2,
+ &prop64, sizeof(uint64_t));
+ }
+}
+
+int dtb_add_range_property(char **dtb, off_t *dtb_size, uint64_t start, uint64_t end,
+ const char *parent, const char *name)
+{
+ uint32_t addr_cells = 0;
+ uint32_t size_cells = 0;
+ char *nodepath = NULL;
+ void *prop = NULL;
+ int nodeoffset = 0;
+ int prop_size = 0;
+ int ret = 0;
+
+ nodepath = malloc(strlen("/") + strlen(parent) + 1);
+ if (!nodepath) {
+ dbgprintf("%s: malloc failed\n", __func__);
+ return -ENOMEM;
+ }
+
+ strcpy(nodepath, "/");
+ strcat(nodepath, parent);
+
+ nodeoffset = fdt_path_offset(*dtb, nodepath);
+ if (nodeoffset < 0) {
+ dbgprintf("%s: fdt_path_offset(%s) failed: %s\n", __func__,
+ nodepath, fdt_strerror(nodeoffset));
+ free(nodepath);
+ return nodeoffset;
+ }
+ free(nodepath);
+
+ ret = dtb_get_num_cells(*dtb, nodeoffset, &addr_cells, &size_cells, true);
+ if (ret < 0)
+ return ret;
+
+ /* Can the range fit with the given address/size cells ? */
+ if ((addr_cells == 1) && (start >= (1ULL << 32)))
+ return -EINVAL;
+
+ if ((size_cells == 1) && ((end - start + 1) >= (1ULL << 32)))
+ return -EINVAL;
+
+ prop_size = sizeof(uint32_t) * (addr_cells + size_cells);
+ prop = malloc(prop_size);
+
+ dtb_fill_int_property(prop, start, addr_cells);
+ dtb_fill_int_property((void *)((uint32_t *)prop + addr_cells),
+ end - start + 1, size_cells);
+
+ /* Add by node path name */
+ return dtb_set_property(dtb, dtb_size, parent, name, prop, prop_size);
+}
+
+/************************\
+* MEMORY RANGES HANDLING *
+\************************/
+
+static int dtb_add_memory_range(struct memory_ranges *mem_ranges, uint64_t start,
+ uint64_t end, unsigned type)
+{
+ struct memory_range this_region = {0};
+ struct memory_range *ranges = mem_ranges->ranges;
+ int i = 0;
+ int ret = 0;
+
+ if (start == end) {
+ dbgprintf("Ignoring empty region\n");
+ return -EINVAL;
+ }
+
+ /* Check if we are adding an existing region */
+ for (i = 0; i < mem_ranges->size; i++) {
+ if (start == ranges[i].start && end == ranges[i].end) {
+ dbgprintf("Duplicate: 0x%lx - 0x%lx\n", start, end);
+
+ if (type == ranges[i].type)
+ return 0;
+ else if (type == RANGE_RESERVED) {
+ ranges[i].type = RANGE_RESERVED;
+ return 0;
+ }
+
+ dbgprintf("Conflicting types for region: 0x%lx - 0x%lx\n",
+ start, end);
+ return -EINVAL;
+ }
+ }
+
+ /*
+ * Reserved regions may be part of an existing /memory
+ * region and shouldn't overlap according to spec, so
+ * since we add /memory regions first, we can exclude
+ * reserved regions here from the existing /memory regions
+ * included in ranges[], so that we don't have the same
+ * region twice.
+ */
+ if (type == RANGE_RESERVED) {
+ this_region.start = start;
+ this_region.end = end - 1;
+ this_region.type = type;
+ ret = mem_regions_exclude(mem_ranges, &this_region);
+ if (ret)
+ return ret;
+ }
+
+ ret = mem_regions_alloc_and_add(mem_ranges, start,
+ end - start, type);
+
+ return ret;
+}
+
+static int dtb_add_memory_region(char *dtb, int nodeoffset,
+ struct memory_ranges *mem_ranges, int type)
+{
+ uint32_t root_addr_cells = 0;
+ uint32_t root_size_cells = 0;
+ uint64_t addr = 0;
+ uint64_t size = 0;
+ const char *reg = NULL;
+ int prop_size = 0;
+ int offset = 0;
+ int entry_size = 0;
+ int num_entries = 0;
+ int ret = 0;
+
+ /*
+ * Get address-cells and size-cells properties (according to
+ * binding spec these are the same as in the root node)
+ */
+ ret = dtb_get_num_cells(dtb, 0, &root_addr_cells, &root_size_cells, false);
+ if (ret < 0) {
+ dbgprintf("No address/size cells on root node !\n");
+ return ret;
+ }
+
+ /*
+ * Parse the reg array, acording to device tree spec it includes
+ * an arbitary number of <address><size> pairs
+ */
+ entry_size = (root_addr_cells + root_size_cells) * sizeof(uint32_t);
+ reg = fdt_getprop(dtb, nodeoffset, "reg", &prop_size);
+ if (!reg) {
+ dbgprintf("Warning: Malformed memory region with no reg property (%s) !\n",
+ fdt_get_name(dtb, nodeoffset, NULL));
+ return -EINVAL;
+ }
+
+ num_entries = prop_size / entry_size;
+ dbgprintf("Got region with %i entries: %s\n", num_entries,
+ fdt_get_name(dtb, nodeoffset, NULL));
+
+ for (num_entries--; num_entries >= 0; num_entries--) {
+ offset = num_entries * entry_size;
+
+ dtb_extract_int_property(&addr, reg + offset,
+ root_addr_cells);
+ offset += root_addr_cells * sizeof(uint32_t);
+
+ dtb_extract_int_property(&size, reg + offset,
+ root_size_cells);
+
+ ret = dtb_add_memory_range(mem_ranges, addr,
+ addr + size, type);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int dtb_parse_memory_reservations_table(char *dtb, struct memory_ranges *mem_ranges)
+{
+ int total_memrsrv = 0;
+ uint64_t addr = 0;
+ uint64_t size = 0;
+ int ret = 0;
+ int i = 0;
+
+ total_memrsrv = fdt_num_mem_rsv(dtb);
+ for (i = 0; i < total_memrsrv; i++) {
+ ret = fdt_get_mem_rsv(dtb, i, &addr, &size);
+ if (ret)
+ continue;
+ ret = dtb_add_memory_range(mem_ranges, addr, addr + size - 1,
+ RANGE_RESERVED);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int dtb_get_reserved_memory_node(char *dtb)
+{
+ uint32_t root_addr_cells = 0;
+ uint32_t root_size_cells = 0;
+ uint32_t addr_cells = 0;
+ uint32_t size_cells = 0;
+ int prop_size = 0;
+ int nodeoffset = 0;
+ int ret = 0;
+
+ /* Get address / size cells from root node */
+ ret = dtb_get_num_cells(dtb, 0, &root_addr_cells, &root_size_cells, false);
+ if (ret < 0) {
+ dbgprintf("No address/size cells on root node !\n");
+ return ret;
+ }
+
+ /* This calls fdt_next_node internaly */
+ nodeoffset = fdt_subnode_offset(dtb, 0, "reserved-memory");
+ if (nodeoffset == -FDT_ERR_NOTFOUND) {
+ return nodeoffset;
+ } else if (nodeoffset < 0) {
+ dbgprintf("Error while looking for reserved-memory: %s\n",
+ fdt_strerror(nodeoffset));
+ return nodeoffset;
+ }
+
+ /* Look for the ranges property */
+ fdt_getprop(dtb, nodeoffset, "ranges", &prop_size);
+ if (prop_size < 0) {
+ fprintf(stderr, "Malformed reserved-memory node (no ranges property) !\n");
+ return -EINVAL;
+ }
+
+ /* Verify address-cells / size-cells */
+ ret = dtb_get_num_cells(dtb, nodeoffset, &addr_cells, &size_cells, false);
+ if (ret < 0) {
+ dbgprintf("No address/size cells property on reserved-memory node\n");
+ return ret;
+ }
+
+ if (addr_cells != root_addr_cells) {
+ fprintf(stderr, "Invalid #address-cells property on reserved-memory node\n");
+ return -EINVAL;
+ }
+
+ if (size_cells != root_size_cells) {
+ fprintf(stderr, "Invalid #size-cells property on reserved-memory node\n");
+ return -EINVAL;
+
+ }
+
+ return nodeoffset;
+}
+
+static int dtb_parse_reserved_memory_node(char *dtb, struct memory_ranges *mem_ranges)
+{
+ int nodeoffset = 0;
+ int node_depth = 0;
+ int parent_depth = 0;
+ int ret = 0;
+
+ nodeoffset = dtb_get_reserved_memory_node(dtb);
+ if (nodeoffset == -FDT_ERR_NOTFOUND)
+ return 0;
+ else if (nodeoffset < 0)
+ return nodeoffset;
+
+ /* Got the parent node, check for sub-nodes */
+
+ /* fdt_next_node() increases or decreases depth */
+ node_depth = parent_depth;
+ nodeoffset = fdt_next_node(dtb, nodeoffset, &node_depth);
+ if (ret < 0) {
+ dbgprintf("Unable to get next node: %s\n",
+ fdt_strerror(ret));
+ return -EINVAL;
+ }
+
+ while (node_depth != parent_depth) {
+
+ ret = dtb_add_memory_region(dtb, nodeoffset,
+ mem_ranges, RANGE_RESERVED);
+ if (ret)
+ return ret;
+
+ nodeoffset = fdt_next_node(dtb, nodeoffset, &node_depth);
+ if (ret < 0) {
+ dbgprintf("Unable to get next node: %s\n",
+ fdt_strerror(ret));
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static int dtb_parse_memory_nodes(char *dtb, struct memory_ranges *mem_ranges)
+{
+ int nodeoffset = 0;
+ int num_regions = 0;
+ const char* dev_type = 0;
+ int prop_size = 0;
+ int ret = 0;
+
+ for (; ; num_regions++) {
+ nodeoffset = fdt_subnode_offset(dtb, nodeoffset,
+ "memory");
+ if (nodeoffset < 0)
+ break;
+
+ dbgprintf("Got memory node at depth: %i\n", fdt_node_depth(dtb, nodeoffset));
+
+ /* Look for the device_type property */
+ dev_type = fdt_getprop(dtb, nodeoffset, "device_type", &prop_size);
+ if (prop_size < 0) {
+ fprintf(stderr, "Malformed /memory node (no device-type property) !\n");
+ return -EINVAL;
+ }
+
+ if (strncmp(dev_type, "memory", prop_size)) {
+ dbgprintf("Got unknown dev_type property: %s\n", dev_type);
+ continue;
+ }
+
+ ret = dtb_add_memory_region(dtb, nodeoffset, mem_ranges, RANGE_RAM);
+ if (ret)
+ return ret;
+ }
+
+ if (!num_regions) {
+ dbgprintf("Malformed dtb, no /memory nodes present !\n");
+ return -EINVAL;
+ }
+
+ dbgprintf("Got %i /memory nodes\n", num_regions);
+
+ return 0;
+}
+
+int dtb_get_memory_ranges(char *dtb, struct memory_ranges *mem_ranges, struct memory_ranges *extra_ranges)
+{
+ int i = 0;
+ int ret = 0;
+
+ /* Fill mem_ranges[] by parsing the device tree */
+ ret = dtb_parse_memory_nodes(dtb, mem_ranges);
+ if (ret)
+ return ret;
+
+ ret = dtb_parse_memory_reservations_table(dtb, mem_ranges);
+ if (ret)
+ return ret;
+
+ ret = dtb_parse_reserved_memory_node(dtb, mem_ranges);
+ if (ret)
+ return ret;
+
+ /* Append any extra ranges provided by the caller (e.g. initrd) */
+ for (i = 0; extra_ranges != NULL && i < extra_ranges->size; i++) {
+ dbgprintf("Adding extra range: 0x%llx - 0x%llx (%s)\n",
+ extra_ranges->ranges[i].start,
+ extra_ranges->ranges[i].end,
+ extra_ranges->ranges[i].type == RANGE_RESERVED ?
+ "RANGE_RESERVED" : "RANGE_RAM");
+
+ ret = dtb_add_memory_range(mem_ranges, extra_ranges->ranges[i].start,
+ extra_ranges->ranges[i].end, extra_ranges->ranges[i].type);
+ if (ret)
+ return ret;
+ }
+
+ mem_regions_sort(mem_ranges);
+
+ return 0;
+}
diff --git a/kexec/dt-ops.h b/kexec/dt-ops.h
index 03659ce..3014205 100644
--- a/kexec/dt-ops.h
+++ b/kexec/dt-ops.h
@@ -11,4 +11,11 @@ int dtb_set_property(char **dtb, off_t *dtb_size, const char *node,
int dtb_delete_property(char *dtb, const char *node, const char *prop);
+void dtb_extract_int_property(uint64_t *val, const void *buf, uint32_t cells);
+void dtb_fill_int_property(void *buf, uint64_t val, uint32_t cells);
+int dtb_add_range_property(char **dtb, off_t *dtb_size, uint64_t start, uint64_t end,
+ const char *node, const char* parent);
+int dtb_get_memory_ranges(char *dtb, struct memory_ranges *mem_ranges,
+ struct memory_ranges *extra_ranges);
+
#endif
diff --git a/kexec/kexec-syscall.h b/kexec/kexec-syscall.h
index bea29d4..2e99e2b 100644
--- a/kexec/kexec-syscall.h
+++ b/kexec/kexec-syscall.h
@@ -134,6 +134,7 @@ static inline long kexec_file_load(int kernel_fd, int initrd_fd,
#define KEXEC_ARCH_MIPS_LE (10 << 16)
#define KEXEC_ARCH_MIPS ( 8 << 16)
#define KEXEC_ARCH_CRIS (76 << 16)
+#define KEXEC_ARCH_RISCV (243 << 16)
#define KEXEC_MAX_SEGMENTS 16
@@ -177,5 +178,8 @@ static inline long kexec_file_load(int kernel_fd, int initrd_fd,
#if defined(__arm64__)
#define KEXEC_ARCH_NATIVE KEXEC_ARCH_ARM64
#endif
+#if defined(__riscv__) || defined(__riscv)
+#define KEXEC_ARCH_NATIVE KEXEC_ARCH_RISCV
+#endif
#endif /* KEXEC_SYSCALL_H */
diff --git a/purgatory/Makefile b/purgatory/Makefile
index 15adb12..11694e5 100644
--- a/purgatory/Makefile
+++ b/purgatory/Makefile
@@ -25,6 +25,7 @@ include $(srcdir)/purgatory/arch/ia64/Makefile
include $(srcdir)/purgatory/arch/mips/Makefile
include $(srcdir)/purgatory/arch/ppc/Makefile
include $(srcdir)/purgatory/arch/ppc64/Makefile
+include $(srcdir)/purgatory/arch/riscv/Makefile
include $(srcdir)/purgatory/arch/s390/Makefile
include $(srcdir)/purgatory/arch/sh/Makefile
include $(srcdir)/purgatory/arch/x86_64/Makefile
diff --git a/purgatory/arch/riscv/Makefile b/purgatory/arch/riscv/Makefile
new file mode 100644
index 0000000..8bded71
--- /dev/null
+++ b/purgatory/arch/riscv/Makefile
@@ -0,0 +1,7 @@
+#
+# Purgatory riscv
+#
+
+riscv_PURGATORY_SRCS =
+
+dist += purgatory/arch/sh/Makefile $(riscv_PURGATORY_SRCS)
--
2.17.1
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