tlb.h revision 91616 
1/*-
2 * Copyright (c) 2001 Jake Burkholder.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/sparc64/include/tlb.h 91616 2002-03-04 07:07:10Z jake $
27 */
28
29#ifndef	_MACHINE_TLB_H_
30#define	_MACHINE_TLB_H_
31
32#define	TLB_SLOT_COUNT			64
33
34#define	TLB_SLOT_TSB_KERNEL_MIN		62	/* XXX */
35#define	TLB_SLOT_KERNEL			63
36
37#define	TLB_DAR_SLOT_SHIFT		(3)
38#define	TLB_DAR_SLOT(slot)		((slot) << TLB_DAR_SLOT_SHIFT)
39
40#define	TAR_VPN_SHIFT			(13)
41#define	TAR_CTX_MASK			((1 << TAR_VPN_SHIFT) - 1)
42
43#define	TLB_TAR_VA(va)			((va) & ~TAR_CTX_MASK)
44#define	TLB_TAR_CTX(ctx)		((ctx) & TAR_CTX_MASK)
45
46#define	TLB_DEMAP_ID_SHIFT		(4)
47#define	TLB_DEMAP_ID_PRIMARY		(0)
48#define	TLB_DEMAP_ID_SECONDARY		(1)
49#define	TLB_DEMAP_ID_NUCLEUS		(2)
50
51#define	TLB_DEMAP_TYPE_SHIFT		(6)
52#define	TLB_DEMAP_TYPE_PAGE		(0)
53#define	TLB_DEMAP_TYPE_CONTEXT		(1)
54
55#define	TLB_DEMAP_VA(va)		((va) & ~PAGE_MASK)
56#define	TLB_DEMAP_ID(id)		((id) << TLB_DEMAP_ID_SHIFT)
57#define	TLB_DEMAP_TYPE(type)		((type) << TLB_DEMAP_TYPE_SHIFT)
58
59#define	TLB_DEMAP_PAGE			(TLB_DEMAP_TYPE(TLB_DEMAP_TYPE_PAGE))
60#define	TLB_DEMAP_CONTEXT		(TLB_DEMAP_TYPE(TLB_DEMAP_TYPE_CONTEXT))
61
62#define	TLB_DEMAP_PRIMARY		(TLB_DEMAP_ID(TLB_DEMAP_ID_PRIMARY))
63#define	TLB_DEMAP_SECONDARY		(TLB_DEMAP_ID(TLB_DEMAP_ID_SECONDARY))
64#define	TLB_DEMAP_NUCLEUS		(TLB_DEMAP_ID(TLB_DEMAP_ID_NUCLEUS))
65
66#define	TLB_CTX_KERNEL			(0)
67#define	TLB_CTX_USER_MIN		(1)
68#define	TLB_CTX_USER_MAX		(8192)
69
70#define	TLB_DTLB			(1 << 0)
71#define	TLB_ITLB			(1 << 1)
72
73#define	MMU_SFSR_ASI_SHIFT		(16)
74#define	MMU_SFSR_FT_SHIFT		(7)
75#define	MMU_SFSR_E_SHIFT		(6)
76#define	MMU_SFSR_CT_SHIFT		(4)
77#define	MMU_SFSR_PR_SHIFT		(3)
78#define	MMU_SFSR_W_SHIFT		(2)
79#define	MMU_SFSR_OW_SHIFT		(1)
80#define	MMU_SFSR_FV_SHIFT		(0)
81
82#define	MMU_SFSR_ASI_SIZE		(8)
83#define	MMU_SFSR_FT_SIZE		(6)
84#define	MMU_SFSR_CT_SIZE		(2)
85
86#define	MMU_SFSR_W			(1L << MMU_SFSR_W_SHIFT)
87
88extern int kernel_tlb_slots;
89extern struct tte *kernel_ttes;
90
91/*
92 * Some tlb operations must be atomical, so no interrupt or trap can be allowed
93 * while they are in progress. Traps should not happen, but interrupts need to
94 * be explicitely disabled. critical_enter() cannot be used here, since it only
95 * disables soft interrupts.
96 * XXX: is something like this needed elsewhere, too?
97 */
98
99static __inline void
100tlb_dtlb_context_primary_demap(void)
101{
102	stxa(TLB_DEMAP_PRIMARY | TLB_DEMAP_CONTEXT, ASI_DMMU_DEMAP, 0);
103	membar(Sync);
104}
105
106static __inline void
107tlb_dtlb_page_demap(u_long ctx, vm_offset_t va)
108{
109	if (ctx == TLB_CTX_KERNEL) {
110		stxa(TLB_DEMAP_VA(va) | TLB_DEMAP_NUCLEUS | TLB_DEMAP_PAGE,
111		    ASI_DMMU_DEMAP, 0);
112		membar(Sync);
113	} else if (ctx != -1) {
114		stxa(TLB_DEMAP_VA(va) | TLB_DEMAP_PRIMARY | TLB_DEMAP_PAGE,
115		    ASI_DMMU_DEMAP, 0);
116		membar(Sync);
117	}
118}
119
120static __inline void
121tlb_dtlb_store(vm_offset_t va, u_long ctx, struct tte tte)
122{
123	u_long pst;
124
125	pst = intr_disable();
126	stxa(AA_DMMU_TAR, ASI_DMMU,
127	    TLB_TAR_VA(va) | TLB_TAR_CTX(ctx));
128	stxa(0, ASI_DTLB_DATA_IN_REG, tte.tte_data);
129	membar(Sync);
130	intr_restore(pst);
131}
132
133static __inline void
134tlb_dtlb_store_slot(vm_offset_t va, u_long ctx, struct tte tte, int slot)
135{
136	u_long pst;
137
138	pst = intr_disable();
139	stxa(AA_DMMU_TAR, ASI_DMMU, TLB_TAR_VA(va) | TLB_TAR_CTX(ctx));
140	stxa(TLB_DAR_SLOT(slot), ASI_DTLB_DATA_ACCESS_REG, tte.tte_data);
141	membar(Sync);
142	intr_restore(pst);
143}
144
145static __inline void
146tlb_itlb_context_primary_demap(void)
147{
148	stxa(TLB_DEMAP_PRIMARY | TLB_DEMAP_CONTEXT, ASI_IMMU_DEMAP, 0);
149	membar(Sync);
150}
151
152static __inline void
153tlb_itlb_page_demap(u_long ctx, vm_offset_t va)
154{
155	if (ctx == TLB_CTX_KERNEL) {
156		stxa(TLB_DEMAP_VA(va) | TLB_DEMAP_NUCLEUS | TLB_DEMAP_PAGE,
157		    ASI_IMMU_DEMAP, 0);
158		flush(KERNBASE);
159	} else if (ctx != -1) {
160		stxa(TLB_DEMAP_VA(va) | TLB_DEMAP_PRIMARY | TLB_DEMAP_PAGE,
161		    ASI_IMMU_DEMAP, 0);
162		membar(Sync);
163	}
164}
165
166static __inline void
167tlb_itlb_store(vm_offset_t va, u_long ctx, struct tte tte)
168{
169	u_long pst;
170
171	pst = intr_disable();
172	stxa(AA_IMMU_TAR, ASI_IMMU, TLB_TAR_VA(va) | TLB_TAR_CTX(ctx));
173	stxa(0, ASI_ITLB_DATA_IN_REG, tte.tte_data);
174	if (ctx == TLB_CTX_KERNEL)
175		flush(va);
176	else {
177		/*
178		 * flush probably not needed and impossible here, no access to
179		 * user page.
180		 */
181		membar(Sync);
182	}
183	intr_restore(pst);
184}
185
186static __inline void
187tlb_context_demap(u_int ctx)
188{
189	if (ctx != -1) {
190		tlb_dtlb_context_primary_demap();
191		tlb_itlb_context_primary_demap();
192	}
193}
194
195static __inline void
196tlb_itlb_store_slot(vm_offset_t va, u_long ctx, struct tte tte, int slot)
197{
198	u_long pst;
199
200	pst = intr_disable();
201	stxa(AA_IMMU_TAR, ASI_IMMU, TLB_TAR_VA(va) | TLB_TAR_CTX(ctx));
202	stxa(TLB_DAR_SLOT(slot), ASI_ITLB_DATA_ACCESS_REG, tte.tte_data);
203	flush(va);
204	intr_restore(pst);
205}
206
207static __inline void
208tlb_page_demap(u_int tlb, u_int ctx, vm_offset_t va)
209{
210	if (tlb & TLB_DTLB)
211		tlb_dtlb_page_demap(ctx, va);
212	if (tlb & TLB_ITLB)
213		tlb_itlb_page_demap(ctx, va);
214}
215
216static __inline void
217tlb_range_demap(u_int ctx, vm_offset_t start, vm_offset_t end)
218{
219	for (; start < end; start += PAGE_SIZE)
220		tlb_page_demap(TLB_DTLB | TLB_ITLB, ctx, start);
221}
222
223static __inline void
224tlb_tte_demap(struct tte tte, u_int ctx)
225{
226	tlb_page_demap(TD_GET_TLB(tte.tte_data), ctx, TV_GET_VA(tte.tte_vpn));
227}
228
229static __inline void
230tlb_store(u_int tlb, vm_offset_t va, u_long ctx, struct tte tte)
231{
232	KASSERT(ctx != -1, ("tlb_store: invalid context"));
233	if (tlb & TLB_DTLB)
234		tlb_dtlb_store(va, ctx, tte);
235	if (tlb & TLB_ITLB)
236		tlb_itlb_store(va, ctx, tte);
237}
238
239static __inline void
240tlb_store_slot(u_int tlb, vm_offset_t va, u_long ctx, struct tte tte, int slot)
241{
242	KASSERT(ctx != -1, ("tlb_store_slot: invalid context"));
243	if (tlb & TLB_DTLB)
244		tlb_dtlb_store_slot(va, ctx, tte, slot);
245	if (tlb & TLB_ITLB)
246		tlb_itlb_store_slot(va, ctx, tte, slot);
247}
248
249#endif /* !_MACHINE_TLB_H_ */
250