blob: 91c8259d4b7ed63e783f70768a4a1465048afd5c (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* OpenRISC ioremap.c
*
* Linux architectural port borrowing liberally from similar works of
* others. All original copyrights apply as per the original source
* declaration.
*
* Modifications for the OpenRISC architecture:
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
*/
#include <linux/vmalloc.h>
#include <linux/io.h>
#include <linux/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/fixmap.h>
#include <asm/bug.h>
#include <linux/sched.h>
#include <asm/tlbflush.h>
extern int mem_init_done;
/**
* OK, this one's a bit tricky... ioremap can get called before memory is
* initialized (early serial console does this) and will want to alloc a page
* for its mapping. No userspace pages will ever get allocated before memory
* is initialized so this applies only to kernel pages. In the event that
* this is called before memory is initialized we allocate the page using
* the memblock infrastructure.
*/
pte_t __ref *pte_alloc_one_kernel(struct mm_struct *mm)
{
pte_t *pte;
if (likely(mem_init_done)) {
pte = (pte_t *)get_zeroed_page(GFP_KERNEL);
} else {
pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
if (!pte)
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
__func__, PAGE_SIZE, PAGE_SIZE);
}
return pte;
}
|
