1 // SPDX-License-Identifier: GPL-2.0-or-later 1
2 /*
3 * OpenRISC ioremap.c
4 *
5 * Linux architectural port borrowing liberall
6 * others. All original copyrights apply as p
7 * declaration.
8 *
9 * Modifications for the OpenRISC architecture
10 * Copyright (C) 2003 Matjaz Breskvar <phoenix
11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@s
12 */
13
14 #include <linux/vmalloc.h>
15 #include <linux/io.h>
16 #include <linux/pgtable.h>
17 #include <asm/pgalloc.h>
18 #include <asm/fixmap.h>
19 #include <asm/bug.h>
20 #include <linux/sched.h>
21 #include <asm/tlbflush.h>
22
23 extern int mem_init_done;
24
25 /*
26 * OK, this one's a bit tricky... ioremap can
27 * initialized (early serial console does this
28 * for its mapping. No userspace pages will e
29 * is initialized so this applies only to kern
30 * this is called before memory is initialized
31 * the memblock infrastructure.
32 */
33
34 pte_t __ref *pte_alloc_one_kernel(struct mm_st
35 {
36 pte_t *pte;
37
38 if (likely(mem_init_done)) {
39 pte = (pte_t *)get_zeroed_page
40 } else {
41 pte = memblock_alloc(PAGE_SIZE
42 if (!pte)
43 panic("%s: Failed to a
44 __func__, PAGE_S
45 }
46
47 return pte;
48 }
49
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