[PATCH v3 4/4] kvx: add support for elf loading using bootm
Clement Leger
cleger at kalray.eu
Tue Jun 30 16:44:02 EDT 2020
From: Clement Leger <clement.leger at kalray.eu>
In order to boot elfs files, add bootm command support for kvx. This support
can boot elf files using bootm elf support. initrd and device-tree handling
is also included and loads them after the elf file load address.
Signed-off-by: Clement Leger <cleger at kalray.eu>
---
arch/kvx/Kconfig | 5 ++
arch/kvx/configs/generic_defconfig | 3 +-
arch/kvx/include/asm/bootm.h | 11 +++
arch/kvx/include/asm/elf.h | 3 +
arch/kvx/lib/Makefile | 2 +-
arch/kvx/lib/bootm.c | 133 +++++++++++++++++++++++++++++
6 files changed, 155 insertions(+), 2 deletions(-)
create mode 100644 arch/kvx/include/asm/bootm.h
create mode 100644 arch/kvx/lib/bootm.c
diff --git a/arch/kvx/Kconfig b/arch/kvx/Kconfig
index 5463bb4f1..3327021e1 100644
--- a/arch/kvx/Kconfig
+++ b/arch/kvx/Kconfig
@@ -1,9 +1,14 @@
config KVX
bool
select 64BIT
+ select BOOTM
+ select BOOTM_ELF
+ select BOOTM_OFTREE
+ select BOOTM_INITRD
select CLKDEV_LOOKUP
select COMMON_CLK
select COMMON_CLK_OF_PROVIDER
+ select ELF
select FLEXIBLE_BOOTARGS
select GENERIC_FIND_NEXT_BIT
select LIBFDT
diff --git a/arch/kvx/configs/generic_defconfig b/arch/kvx/configs/generic_defconfig
index f9ff773a0..816217174 100644
--- a/arch/kvx/configs/generic_defconfig
+++ b/arch/kvx/configs/generic_defconfig
@@ -1,7 +1,8 @@
CONFIG_AUTO_COMPLETE=y
CONFIG_BAUDRATE=115200
-# CONFIG_BOOTM is not set
CONFIG_CLOCKSOURCE_KVX=y
+CONFIG_CMD_BOOT=y
+CONFIG_CMD_BOOTM=y
CONFIG_CMD_CMP=y
CONFIG_CMD_OF_DUMP=y
CONFIG_CMD_POWEROFF=y
diff --git a/arch/kvx/include/asm/bootm.h b/arch/kvx/include/asm/bootm.h
new file mode 100644
index 000000000..7ad7e2e87
--- /dev/null
+++ b/arch/kvx/include/asm/bootm.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2019 Kalray Inc.
+ */
+
+#ifndef _ASM_KVX_BOOTM_H
+#define _ASM_KVX_BOOTM_H
+
+#define LINUX_BOOT_PARAM_MAGIC 0x31564752414E494CULL
+
+#endif /* _ASM_KVX_BOOTM_H */
diff --git a/arch/kvx/include/asm/elf.h b/arch/kvx/include/asm/elf.h
index 7cc09d7ba..2975ad1b9 100644
--- a/arch/kvx/include/asm/elf.h
+++ b/arch/kvx/include/asm/elf.h
@@ -11,6 +11,9 @@
*/
#include <linux/types.h>
+#define EM_KVX 256
+
+#define ELF_ARCH EM_KVX
#define ELF_CLASS ELFCLASS32
#define ELF_DATA ELFDATA2MSB
diff --git a/arch/kvx/lib/Makefile b/arch/kvx/lib/Makefile
index 352e7034a..6e56462da 100644
--- a/arch/kvx/lib/Makefile
+++ b/arch/kvx/lib/Makefile
@@ -3,4 +3,4 @@
# Copyright (C) 2019 Kalray Inc.
#
-obj-y += cpuinfo.o board.o dtb.o poweroff.o
+obj-y += cpuinfo.o board.o dtb.o poweroff.o bootm.o
diff --git a/arch/kvx/lib/bootm.c b/arch/kvx/lib/bootm.c
new file mode 100644
index 000000000..198eef798
--- /dev/null
+++ b/arch/kvx/lib/bootm.c
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2019 Kalray Inc.
+ */
+
+#include <elf.h>
+#include <boot.h>
+#include <init.h>
+#include <bootm.h>
+#include <binfmt.h>
+#include <common.h>
+#include <libfile.h>
+#include <linux/kernel.h>
+
+#include <asm/cache.h>
+#include <asm/bootm.h>
+
+typedef void __noreturn (*boot_func_entry)(unsigned long, void *);
+
+static int do_boot_entry(struct image_data *data, boot_func_entry entry,
+ void *fdt_load_addr)
+{
+ printf("starting elf (entry at %p)\n", entry);
+
+ if (data->dryrun)
+ return 0;
+
+ shutdown_barebox();
+
+ /* Synchronize I-cache with D-cache */
+ sync_caches_for_execution();
+
+ /**
+ * Parameters passing
+ * r0: boot magic
+ * r1: device tree pointer
+ */
+ entry(LINUX_BOOT_PARAM_MAGIC, (void *) fdt_load_addr);
+
+ /* should never return ! */
+ panic("Returned from boot program !\n");
+
+ return -EINVAL;
+}
+
+static int do_boot_elf(struct image_data *data, struct elf_image *elf)
+{
+ int ret;
+ void *fdt;
+ boot_func_entry entry;
+ unsigned long load_addr, initrd_address;
+
+ /* load initrd after the elf */
+ load_addr = PAGE_ALIGN((unsigned long) elf->high_addr);
+ if (bootm_has_initrd(data)) {
+ if (data->initrd_address != UIMAGE_INVALID_ADDRESS)
+ initrd_address = data->initrd_address;
+ else
+ initrd_address = load_addr;
+
+ printf("Loading initrd at 0x%lx\n", initrd_address);
+ ret = bootm_load_initrd(data, initrd_address);
+ if (ret) {
+ printf("Failed to load initrd\n");
+ return ret;
+ }
+
+ if (data->initrd_address == UIMAGE_INVALID_ADDRESS) {
+ load_addr += resource_size(data->initrd_res);
+ load_addr = PAGE_ALIGN(load_addr);
+ }
+ }
+
+ fdt = bootm_get_devicetree(data);
+ if (IS_ERR(fdt)) {
+ printf("Failed to load dtb\n");
+ return PTR_ERR(fdt);
+ }
+
+ printf("Loading device tree at %lx\n", load_addr);
+ /* load device tree after the initrd if any */
+ ret = bootm_load_devicetree(data, fdt, load_addr);
+ if (ret) {
+ printf("Failed to load device tree: %d\n", ret);
+ goto err_free_fdt;
+ }
+
+ entry = (boot_func_entry) data->os_address;
+
+ ret = do_boot_entry(data, entry, fdt);
+
+err_free_fdt:
+ free(fdt);
+
+ return ret;
+}
+
+static int do_bootm_elf(struct image_data *data)
+{
+ int ret;
+
+ ret = bootm_load_os(data, data->os_address);
+ if (ret)
+ return ret;
+
+ return do_boot_elf(data, data->elf);
+}
+
+static struct image_handler elf_handler = {
+ .name = "ELF",
+ .bootm = do_bootm_elf,
+ .filetype = filetype_elf,
+};
+
+static struct binfmt_hook binfmt_elf_hook = {
+ .type = filetype_elf,
+ .exec = "bootm",
+};
+
+static int kvx_register_image_handler(void)
+{
+ register_image_handler(&elf_handler);
+
+ binfmt_register(&binfmt_elf_hook);
+
+ return 0;
+}
+
+late_initcall(kvx_register_image_handler);
--
2.17.1
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