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Diffstat (limited to 'arch/m68k/kernel/bootinfo_proc.c')
-rw-r--r--arch/m68k/kernel/bootinfo_proc.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/arch/m68k/kernel/bootinfo_proc.c b/arch/m68k/kernel/bootinfo_proc.c
new file mode 100644
index 000000000..857fa2aaa
--- /dev/null
+++ b/arch/m68k/kernel/bootinfo_proc.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Based on arch/arm/kernel/atags_proc.c
+ */
+
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/printk.h>
+#include <linux/proc_fs.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include <asm/bootinfo.h>
+#include <asm/byteorder.h>
+
+
+static char bootinfo_tmp[1536] __initdata;
+
+static void *bootinfo_copy;
+static size_t bootinfo_size;
+
+static ssize_t bootinfo_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ return simple_read_from_buffer(buf, count, ppos, bootinfo_copy,
+ bootinfo_size);
+}
+
+static const struct proc_ops bootinfo_proc_ops = {
+ .proc_read = bootinfo_read,
+ .proc_lseek = default_llseek,
+};
+
+void __init save_bootinfo(const struct bi_record *bi)
+{
+ const void *start = bi;
+ size_t size = sizeof(bi->tag);
+
+ while (be16_to_cpu(bi->tag) != BI_LAST) {
+ uint16_t n = be16_to_cpu(bi->size);
+ size += n;
+ bi = (struct bi_record *)((unsigned long)bi + n);
+ }
+
+ if (size > sizeof(bootinfo_tmp)) {
+ pr_err("Cannot save %zu bytes of bootinfo\n", size);
+ return;
+ }
+
+ pr_info("Saving %zu bytes of bootinfo\n", size);
+ memcpy(bootinfo_tmp, start, size);
+ bootinfo_size = size;
+}
+
+static int __init init_bootinfo_procfs(void)
+{
+ /*
+ * This cannot go into save_bootinfo() because kmalloc and proc don't
+ * work yet when it is called.
+ */
+ struct proc_dir_entry *pde;
+
+ if (!bootinfo_size)
+ return -EINVAL;
+
+ bootinfo_copy = kmemdup(bootinfo_tmp, bootinfo_size, GFP_KERNEL);
+ if (!bootinfo_copy)
+ return -ENOMEM;
+
+ pde = proc_create_data("bootinfo", 0400, NULL, &bootinfo_proc_ops, NULL);
+ if (!pde) {
+ kfree(bootinfo_copy);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+arch_initcall(init_bootinfo_procfs);