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Diffstat (limited to 'arch/um/kernel/load_file.c')
-rw-r--r--arch/um/kernel/load_file.c61
1 files changed, 61 insertions, 0 deletions
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;
+}