1/*
2 * Miscellaneous low-level MMU functions.
3 *
4 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
5 * Copyright (C) 2008-2009 PetaLogix
6 * Copyright (C) 2007 Xilinx, Inc.  All rights reserved.
7 *
8 * Derived from arch/ppc/kernel/misc.S
9 *
10 * This file is subject to the terms and conditions of the GNU General
11 * Public License. See the file COPYING in the main directory of this
12 * archive for more details.
13 */
14
15#include <linux/linkage.h>
16#include <linux/sys.h>
17#include <asm/unistd.h>
18#include <linux/errno.h>
19#include <asm/mmu.h>
20#include <asm/page.h>
21
22	.text
23/*
24 * Flush MMU TLB
25 *
26 * We avoid flushing the pinned 0, 1 and possibly 2 entries.
27 */
28.globl _tlbia;
29.type  _tlbia, @function
30.align 4;
31_tlbia:
32	lwi	r12, r0, tlb_skip;
33	/* isync */
34_tlbia_1:
35	mts	rtlbx, r12
36	nop
37	mts	rtlbhi, r0 /* flush: ensure V is clear */
38	nop
39	rsubi	r11, r12, MICROBLAZE_TLB_SIZE - 1
40	bneid	r11, _tlbia_1 /* loop for all entries */
41	addik	r12, r12, 1
42	mbar	1 /* sync */
43	rtsd	r15, 8
44	nop
45	.size  _tlbia, . - _tlbia
46
47/*
48 * Flush MMU TLB for a particular address (in r5)
49 */
50.globl _tlbie;
51.type  _tlbie, @function
52.align 4;
53_tlbie:
54	mts	rtlbsx, r5 /* look up the address in TLB */
55	nop
56	mfs	r12, rtlbx /* Retrieve index */
57	nop
58	blti	r12, _tlbie_1 /* Check if found */
59	mts	rtlbhi, r0 /* flush: ensure V is clear */
60	nop
61	mbar	1 /* sync */
62_tlbie_1:
63	rtsd	r15, 8
64	nop
65
66	.size  _tlbie, . - _tlbie
67