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-rw-r--r--fs/proc/nommu.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/fs/proc/nommu.c b/fs/proc/nommu.c
new file mode 100644
index 0000000000..4d34935794
--- /dev/null
+++ b/fs/proc/nommu.c
@@ -0,0 +1,116 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* nommu.c: mmu-less memory info files
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/time.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/mman.h>
+#include <linux/proc_fs.h>
+#include <linux/mm.h>
+#include <linux/mmzone.h>
+#include <linux/pagemap.h>
+#include <linux/swap.h>
+#include <linux/smp.h>
+#include <linux/seq_file.h>
+#include <linux/hugetlb.h>
+#include <linux/vmalloc.h>
+#include <asm/tlb.h>
+#include <asm/div64.h>
+#include "internal.h"
+
+/*
+ * display a single region to a sequenced file
+ */
+static int nommu_region_show(struct seq_file *m, struct vm_region *region)
+{
+ unsigned long ino = 0;
+ struct file *file;
+ dev_t dev = 0;
+ int flags;
+
+ flags = region->vm_flags;
+ file = region->vm_file;
+
+ if (file) {
+ struct inode *inode = file_inode(region->vm_file);
+ dev = inode->i_sb->s_dev;
+ ino = inode->i_ino;
+ }
+
+ seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
+ seq_printf(m,
+ "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
+ region->vm_start,
+ region->vm_end,
+ flags & VM_READ ? 'r' : '-',
+ flags & VM_WRITE ? 'w' : '-',
+ flags & VM_EXEC ? 'x' : '-',
+ flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
+ ((loff_t)region->vm_pgoff) << PAGE_SHIFT,
+ MAJOR(dev), MINOR(dev), ino);
+
+ if (file) {
+ seq_pad(m, ' ');
+ seq_file_path(m, file, "");
+ }
+
+ seq_putc(m, '\n');
+ return 0;
+}
+
+/*
+ * display a list of all the REGIONs the kernel knows about
+ * - nommu kernels have a single flat list
+ */
+static int nommu_region_list_show(struct seq_file *m, void *_p)
+{
+ struct rb_node *p = _p;
+
+ return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
+}
+
+static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos)
+{
+ struct rb_node *p;
+ loff_t pos = *_pos;
+
+ down_read(&nommu_region_sem);
+
+ for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
+ if (pos-- == 0)
+ return p;
+ return NULL;
+}
+
+static void nommu_region_list_stop(struct seq_file *m, void *v)
+{
+ up_read(&nommu_region_sem);
+}
+
+static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ (*pos)++;
+ return rb_next((struct rb_node *) v);
+}
+
+static const struct seq_operations proc_nommu_region_list_seqop = {
+ .start = nommu_region_list_start,
+ .next = nommu_region_list_next,
+ .stop = nommu_region_list_stop,
+ .show = nommu_region_list_show
+};
+
+static int __init proc_nommu_init(void)
+{
+ proc_create_seq("maps", S_IRUGO, NULL, &proc_nommu_region_list_seqop);
+ return 0;
+}
+
+fs_initcall(proc_nommu_init);