1/* MN10300 TLB flushing functions
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11#ifndef _ASM_TLBFLUSH_H
12#define _ASM_TLBFLUSH_H
13
14#include <linux/mm.h>
15#include <asm/processor.h>
16
17struct tlb_state {
18	struct mm_struct	*active_mm;
19	int			state;
20};
21DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);
22
23/**
24 * local_flush_tlb - Flush the current MM's entries from the local CPU's TLBs
25 */
26static inline void local_flush_tlb(void)
27{
28	int w;
29	asm volatile(
30		"	mov	%1,%0		\n"
31		"	or	%2,%0		\n"
32		"	mov	%0,%1		\n"
33		: "=d"(w)
34		: "m"(MMUCTR), "i"(MMUCTR_IIV|MMUCTR_DIV)
35		: "cc", "memory");
36}
37
38/**
39 * local_flush_tlb_all - Flush all entries from the local CPU's TLBs
40 */
41static inline void local_flush_tlb_all(void)
42{
43	local_flush_tlb();
44}
45
46/**
47 * local_flush_tlb_one - Flush one entry from the local CPU's TLBs
48 */
49static inline void local_flush_tlb_one(unsigned long addr)
50{
51	local_flush_tlb();
52}
53
54/**
55 * local_flush_tlb_page - Flush a page's entry from the local CPU's TLBs
56 * @mm: The MM to flush for
57 * @addr: The address of the target page in RAM (not its page struct)
58 */
59static inline
60void local_flush_tlb_page(struct mm_struct *mm, unsigned long addr)
61{
62	unsigned long pteu, flags, cnx;
63
64	addr &= PAGE_MASK;
65
66	local_irq_save(flags);
67
68	cnx = 1;
69#ifdef CONFIG_MN10300_TLB_USE_PIDR
70	cnx = mm->context.tlbpid[smp_processor_id()];
71#endif
72	if (cnx) {
73		pteu = addr;
74#ifdef CONFIG_MN10300_TLB_USE_PIDR
75		pteu |= cnx & xPTEU_PID;
76#endif
77		IPTEU = pteu;
78		DPTEU = pteu;
79		if (IPTEL & xPTEL_V)
80			IPTEL = 0;
81		if (DPTEL & xPTEL_V)
82			DPTEL = 0;
83	}
84	local_irq_restore(flags);
85}
86
87/*
88 * TLB flushing:
89 *
90 *  - flush_tlb() flushes the current mm struct TLBs
91 *  - flush_tlb_all() flushes all processes TLBs
92 *  - flush_tlb_mm(mm) flushes the specified mm context TLB's
93 *  - flush_tlb_page(vma, vmaddr) flushes one page
94 *  - flush_tlb_range(mm, start, end) flushes a range of pages
95 *  - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
96 */
97#ifdef CONFIG_SMP
98
99#include <asm/smp.h>
100
101extern void flush_tlb_all(void);
102extern void flush_tlb_current_task(void);
103extern void flush_tlb_mm(struct mm_struct *);
104extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
105
106#define flush_tlb()		flush_tlb_current_task()
107
108static inline void flush_tlb_range(struct vm_area_struct *vma,
109				   unsigned long start, unsigned long end)
110{
111	flush_tlb_mm(vma->vm_mm);
112}
113
114#else   /* CONFIG_SMP */
115
116static inline void flush_tlb_all(void)
117{
118	preempt_disable();
119	local_flush_tlb_all();
120	preempt_enable();
121}
122
123static inline void flush_tlb_mm(struct mm_struct *mm)
124{
125	preempt_disable();
126	local_flush_tlb_all();
127	preempt_enable();
128}
129
130static inline void flush_tlb_range(struct vm_area_struct *vma,
131				   unsigned long start, unsigned long end)
132{
133	preempt_disable();
134	local_flush_tlb_all();
135	preempt_enable();
136}
137
138#define flush_tlb_page(vma, addr)	local_flush_tlb_page((vma)->vm_mm, addr)
139#define flush_tlb()			flush_tlb_all()
140
141#endif /* CONFIG_SMP */
142
143static inline void flush_tlb_kernel_range(unsigned long start,
144					  unsigned long end)
145{
146	flush_tlb_all();
147}
148
149static inline void flush_tlb_pgtables(struct mm_struct *mm,
150				      unsigned long start, unsigned long end)
151{
152}
153
154#endif /* _ASM_TLBFLUSH_H */
155