The file loading support in initrd.c can be re-used for
loading devicetrees. Move it out of initrd.c.
Signed-off-by: Vincent Whitchurch <vincent.whitchurch@xxxxxxxx>
---
arch/um/kernel/Makefile | 1 +
arch/um/kernel/initrd.c | 48 ++++--------------------------
arch/um/kernel/load_file.c | 61 ++++++++++++++++++++++++++++++++++++++
arch/um/kernel/um_arch.h | 8 +++++
4 files changed, 75 insertions(+), 43 deletions(-)
create mode 100644 arch/um/kernel/load_file.c
create mode 100644 arch/um/kernel/um_arch.h
diff --git a/arch/um/kernel/Makefile b/arch/um/kernel/Makefile
index 1d18e4e46989..92692bfef7ae 100644
--- a/arch/um/kernel/Makefile
+++ b/arch/um/kernel/Makefile
@@ -18,6 +18,7 @@ obj-y = config.o exec.o exitcode.o irq.o ksyms.o mem.o \
physmem.o process.o ptrace.o reboot.o sigio.o \
signal.o syscall.o sysrq.o time.o tlb.o trap.o \
um_arch.o umid.o maccess.o kmsg_dump.o capflags.o skas/
+obj-y += load_file.o
obj-$(CONFIG_BLK_DEV_INITRD) += initrd.o
obj-$(CONFIG_GPROF) += gprof_syms.o
diff --git a/arch/um/kernel/initrd.c b/arch/um/kernel/initrd.c
index c1981ffb7179..47b8cb1a1156 100644
--- a/arch/um/kernel/initrd.c
+++ b/arch/um/kernel/initrd.c
@@ -10,37 +10,21 @@
#include <init.h>
#include <os.h>
+#include "um_arch.h"
+
/* Changed by uml_initrd_setup, which is a setup */
static char *initrd __initdata = NULL;
-static int load_initrd(char *filename, void *buf, int size);
int __init read_initrd(void)
{
+ unsigned long long size;
void *area;
- long long size;
- int err;
-
- if (initrd == NULL)
- return 0;
- err = os_file_size(initrd, &size);
- if (err)
+ if (!initrd)
return 0;
- /*
- * This is necessary because alloc_bootmem craps out if you
- * ask for no memory.
- */
- if (size == 0) {
- printk(KERN_ERR "\"%s\" is a zero-size initrd\n", initrd);
- return 0;
- }
-
- area = memblock_alloc(size, SMP_CACHE_BYTES);
+ area = uml_load_file(initrd, &size);
if (!area)
- panic("%s: Failed to allocate %llu bytes\n", __func__, size);
-
- if (load_initrd(initrd, area, size) == -1)
return 0;
initrd_start = (unsigned long) area;
@@ -59,25 +43,3 @@ __uml_setup("initrd=", uml_initrd_setup,
" This is used to boot UML from an initrd image. The argument is the\n"
" name of the file containing the image.\n\n"
);
-
-static int load_initrd(char *filename, void *buf, int size)
-{
- int fd, n;
-
- fd = os_open_file(filename, of_read(OPENFLAGS()), 0);
- if (fd < 0) {
- printk(KERN_ERR "Opening '%s' failed - err = %d\n", filename,
- -fd);
- return -1;
- }
- n = os_read_file(fd, buf, size);
- if (n != size) {
- printk(KERN_ERR "Read of %d bytes from '%s' failed, "
- "err = %d\n", size,
- filename, -n);
- return -1;
- }
-
- os_close_file(fd);
- return 0;
-}
diff --git a/arch/um/kernel/load_file.c b/arch/um/kernel/load_file.c
new file mode 100644
index 000000000000..5cecd0e291fb
--- /dev/null
+++ b/arch/um/kernel/load_file.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ */
+#include <linux/memblock.h>
+#include <os.h>
+
+#include "um_arch.h"
+
+static int __init __uml_load_file(const char *filename, void *buf, int size)
+{
+ int fd, n;
+
+ fd = os_open_file(filename, of_read(OPENFLAGS()), 0);
+ if (fd < 0) {
+ printk(KERN_ERR "Opening '%s' failed - err = %d\n", filename,
+ -fd);
+ return -1;
+ }
+ n = os_read_file(fd, buf, size);
+ if (n != size) {
+ printk(KERN_ERR "Read of %d bytes from '%s' failed, "
+ "err = %d\n", size,
+ filename, -n);
+ return -1;
+ }
+
+ os_close_file(fd);
+ return 0;
+}
+
+void *uml_load_file(const char *filename, unsigned long long *size)
+{
+ void *area;
+ int err;
+
+ *size = 0;
+
+ if (!filename)
+ return NULL;
+
+ err = os_file_size(filename, size);
+ if (err)
+ return NULL;
+
+ if (*size == 0) {
+ printk(KERN_ERR "\"%s\" is empty\n", filename);
+ return NULL;
+ }
+
+ area = memblock_alloc(*size, SMP_CACHE_BYTES);
+ if (!area)
+ panic("%s: Failed to allocate %llu bytes\n", __func__, *size);
+
+ if (__uml_load_file(filename, area, *size)) {
+ memblock_free(area, *size);
+ return NULL;
+ }
+
+ return area;
+}
diff --git a/arch/um/kernel/um_arch.h b/arch/um/kernel/um_arch.h
new file mode 100644
index 000000000000..b195df3a09a0
--- /dev/null
+++ b/arch/um/kernel/um_arch.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __UML_ARCH_H__
+#define __UML_ARCH_H__
+
+extern void * __init uml_load_file(const char *filename, unsigned long long *size);
+
+#endif
--
2.33.1
