xref: /openbmc/linux/arch/arm/mm/proc-macros.S (revision 4f3db074) 
1/*
2 * We need constants.h for:
3 *  VMA_VM_MM
4 *  VMA_VM_FLAGS
5 *  VM_EXEC
6 */
7#include <asm/asm-offsets.h>
8#include <asm/thread_info.h>
9
10/*
11 * vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
12 */
13	.macro	vma_vm_mm, rd, rn
14	ldr	\rd, [\rn, #VMA_VM_MM]
15	.endm
16
17/*
18 * vma_vm_flags - get vma->vm_flags
19 */
20	.macro	vma_vm_flags, rd, rn
21	ldr	\rd, [\rn, #VMA_VM_FLAGS]
22	.endm
23
24	.macro	tsk_mm, rd, rn
25	ldr	\rd, [\rn, #TI_TASK]
26	ldr	\rd, [\rd, #TSK_ACTIVE_MM]
27	.endm
28
29/*
30 * act_mm - get current->active_mm
31 */
32	.macro	act_mm, rd
33	bic	\rd, sp, #8128
34	bic	\rd, \rd, #63
35	ldr	\rd, [\rd, #TI_TASK]
36	ldr	\rd, [\rd, #TSK_ACTIVE_MM]
37	.endm
38
39/*
40 * mmid - get context id from mm pointer (mm->context.id)
41 * note, this field is 64bit, so in big-endian the two words are swapped too.
42 */
43	.macro	mmid, rd, rn
44#ifdef __ARMEB__
45	ldr	\rd, [\rn, #MM_CONTEXT_ID + 4 ]
46#else
47	ldr	\rd, [\rn, #MM_CONTEXT_ID]
48#endif
49	.endm
50
51/*
52 * mask_asid - mask the ASID from the context ID
53 */
54	.macro	asid, rd, rn
55	and	\rd, \rn, #255
56	.endm
57
58	.macro	crval, clear, mmuset, ucset
59#ifdef CONFIG_MMU
60	.word	\clear
61	.word	\mmuset
62#else
63	.word	\clear
64	.word	\ucset
65#endif
66	.endm
67
68/*
69 * dcache_line_size - get the minimum D-cache line size from the CTR register
70 * on ARMv7.
71 */
72	.macro	dcache_line_size, reg, tmp
73	mrc	p15, 0, \tmp, c0, c0, 1		@ read ctr
74	lsr	\tmp, \tmp, #16
75	and	\tmp, \tmp, #0xf		@ cache line size encoding
76	mov	\reg, #4			@ bytes per word
77	mov	\reg, \reg, lsl \tmp		@ actual cache line size
78	.endm
79
80/*
81 * icache_line_size - get the minimum I-cache line size from the CTR register
82 * on ARMv7.
83 */
84	.macro	icache_line_size, reg, tmp
85	mrc	p15, 0, \tmp, c0, c0, 1		@ read ctr
86	and	\tmp, \tmp, #0xf		@ cache line size encoding
87	mov	\reg, #4			@ bytes per word
88	mov	\reg, \reg, lsl \tmp		@ actual cache line size
89	.endm
90
91/*
92 * Sanity check the PTE configuration for the code below - which makes
93 * certain assumptions about how these bits are laid out.
94 */
95#ifdef CONFIG_MMU
96#if L_PTE_SHARED != PTE_EXT_SHARED
97#error PTE shared bit mismatch
98#endif
99#if !defined (CONFIG_ARM_LPAE) && \
100	(L_PTE_XN+L_PTE_USER+L_PTE_RDONLY+L_PTE_DIRTY+L_PTE_YOUNG+\
101	 L_PTE_PRESENT) > L_PTE_SHARED
102#error Invalid Linux PTE bit settings
103#endif
104#endif	/* CONFIG_MMU */
105
106/*
107 * The ARMv6 and ARMv7 set_pte_ext translation function.
108 *
109 * Permission translation:
110 *  YUWD  APX AP1 AP0	SVC	User
111 *  0xxx   0   0   0	no acc	no acc
112 *  100x   1   0   1	r/o	no acc
113 *  10x0   1   0   1	r/o	no acc
114 *  1011   0   0   1	r/w	no acc
115 *  110x   1   1   1	r/o	r/o
116 *  11x0   1   1   1	r/o	r/o
117 *  1111   0   1   1	r/w	r/w
118 */
119	.macro	armv6_mt_table pfx
120\pfx\()_mt_table:
121	.long	0x00						@ L_PTE_MT_UNCACHED
122	.long	PTE_EXT_TEX(1)					@ L_PTE_MT_BUFFERABLE
123	.long	PTE_CACHEABLE					@ L_PTE_MT_WRITETHROUGH
124	.long	PTE_CACHEABLE | PTE_BUFFERABLE			@ L_PTE_MT_WRITEBACK
125	.long	PTE_BUFFERABLE					@ L_PTE_MT_DEV_SHARED
126	.long	0x00						@ unused
127	.long	0x00						@ L_PTE_MT_MINICACHE (not present)
128	.long	PTE_EXT_TEX(1) | PTE_CACHEABLE | PTE_BUFFERABLE	@ L_PTE_MT_WRITEALLOC
129	.long	0x00						@ unused
130	.long	PTE_EXT_TEX(1)					@ L_PTE_MT_DEV_WC
131	.long	0x00						@ unused
132	.long	PTE_CACHEABLE | PTE_BUFFERABLE			@ L_PTE_MT_DEV_CACHED
133	.long	PTE_EXT_TEX(2)					@ L_PTE_MT_DEV_NONSHARED
134	.long	0x00						@ unused
135	.long	0x00						@ unused
136	.long	PTE_CACHEABLE | PTE_BUFFERABLE | PTE_EXT_APX	@ L_PTE_MT_VECTORS
137	.endm
138
139	.macro	armv6_set_pte_ext pfx
140	str	r1, [r0], #2048			@ linux version
141
142	bic	r3, r1, #0x000003fc
143	bic	r3, r3, #PTE_TYPE_MASK
144	orr	r3, r3, r2
145	orr	r3, r3, #PTE_EXT_AP0 | 2
146
147	adr	ip, \pfx\()_mt_table
148	and	r2, r1, #L_PTE_MT_MASK
149	ldr	r2, [ip, r2]
150
151	eor	r1, r1, #L_PTE_DIRTY
152	tst	r1, #L_PTE_DIRTY|L_PTE_RDONLY
153	orrne	r3, r3, #PTE_EXT_APX
154
155	tst	r1, #L_PTE_USER
156	orrne	r3, r3, #PTE_EXT_AP1
157	tstne	r3, #PTE_EXT_APX
158
159	@ user read-only -> kernel read-only
160	bicne	r3, r3, #PTE_EXT_AP0
161
162	tst	r1, #L_PTE_XN
163	orrne	r3, r3, #PTE_EXT_XN
164
165	eor	r3, r3, r2
166
167	tst	r1, #L_PTE_YOUNG
168	tstne	r1, #L_PTE_PRESENT
169	moveq	r3, #0
170	tstne	r1, #L_PTE_NONE
171	movne	r3, #0
172
173	str	r3, [r0]
174	mcr	p15, 0, r0, c7, c10, 1		@ flush_pte
175	.endm
176
177
178/*
179 * The ARMv3, ARMv4 and ARMv5 set_pte_ext translation function,
180 * covering most CPUs except Xscale and Xscale 3.
181 *
182 * Permission translation:
183 *  YUWD   AP	SVC	User
184 *  0xxx  0x00	no acc	no acc
185 *  100x  0x00	r/o	no acc
186 *  10x0  0x00	r/o	no acc
187 *  1011  0x55	r/w	no acc
188 *  110x  0xaa	r/w	r/o
189 *  11x0  0xaa	r/w	r/o
190 *  1111  0xff	r/w	r/w
191 */
192	.macro	armv3_set_pte_ext wc_disable=1
193	str	r1, [r0], #2048			@ linux version
194
195	eor	r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY
196
197	bic	r2, r1, #PTE_SMALL_AP_MASK	@ keep C, B bits
198	bic	r2, r2, #PTE_TYPE_MASK
199	orr	r2, r2, #PTE_TYPE_SMALL
200
201	tst	r3, #L_PTE_USER			@ user?
202	orrne	r2, r2, #PTE_SMALL_AP_URO_SRW
203
204	tst	r3, #L_PTE_RDONLY | L_PTE_DIRTY	@ write and dirty?
205	orreq	r2, r2, #PTE_SMALL_AP_UNO_SRW
206
207	tst	r3, #L_PTE_PRESENT | L_PTE_YOUNG	@ present and young?
208	movne	r2, #0
209
210	.if	\wc_disable
211#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
212	tst	r2, #PTE_CACHEABLE
213	bicne	r2, r2, #PTE_BUFFERABLE
214#endif
215	.endif
216	str	r2, [r0]		@ hardware version
217	.endm
218
219
220/*
221 * Xscale set_pte_ext translation, split into two halves to cope
222 * with work-arounds.  r3 must be preserved by code between these
223 * two macros.
224 *
225 * Permission translation:
226 *  YUWD  AP	SVC	User
227 *  0xxx  00	no acc	no acc
228 *  100x  00	r/o	no acc
229 *  10x0  00	r/o	no acc
230 *  1011  01	r/w	no acc
231 *  110x  10	r/w	r/o
232 *  11x0  10	r/w	r/o
233 *  1111  11	r/w	r/w
234 */
235	.macro	xscale_set_pte_ext_prologue
236	str	r1, [r0]			@ linux version
237
238	eor	r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY
239
240	bic	r2, r1, #PTE_SMALL_AP_MASK	@ keep C, B bits
241	orr	r2, r2, #PTE_TYPE_EXT		@ extended page
242
243	tst	r3, #L_PTE_USER			@ user?
244	orrne	r2, r2, #PTE_EXT_AP_URO_SRW	@ yes -> user r/o, system r/w
245
246	tst	r3, #L_PTE_RDONLY | L_PTE_DIRTY	@ write and dirty?
247	orreq	r2, r2, #PTE_EXT_AP_UNO_SRW	@ yes -> user n/a, system r/w
248						@ combined with user -> user r/w
249	.endm
250
251	.macro	xscale_set_pte_ext_epilogue
252	tst	r3, #L_PTE_PRESENT | L_PTE_YOUNG	@ present and young?
253	movne	r2, #0				@ no -> fault
254
255	str	r2, [r0, #2048]!		@ hardware version
256	mov	ip, #0
257	mcr	p15, 0, r0, c7, c10, 1		@ clean L1 D line
258	mcr	p15, 0, ip, c7, c10, 4		@ data write barrier
259	.endm
260
261.macro define_processor_functions name:req, dabort:req, pabort:req, nommu=0, suspend=0
262	.type	\name\()_processor_functions, #object
263	.align 2
264ENTRY(\name\()_processor_functions)
265	.word	\dabort
266	.word	\pabort
267	.word	cpu_\name\()_proc_init
268	.word	cpu_\name\()_proc_fin
269	.word	cpu_\name\()_reset
270	.word	cpu_\name\()_do_idle
271	.word	cpu_\name\()_dcache_clean_area
272	.word	cpu_\name\()_switch_mm
273
274	.if \nommu
275	.word	0
276	.else
277	.word	cpu_\name\()_set_pte_ext
278	.endif
279
280	.if \suspend
281	.word	cpu_\name\()_suspend_size
282#ifdef CONFIG_ARM_CPU_SUSPEND
283	.word	cpu_\name\()_do_suspend
284	.word	cpu_\name\()_do_resume
285#else
286	.word	0
287	.word	0
288#endif
289	.else
290	.word	0
291	.word	0
292	.word	0
293	.endif
294
295	.size	\name\()_processor_functions, . - \name\()_processor_functions
296.endm
297
298.macro define_cache_functions name:req
299	.align 2
300	.type	\name\()_cache_fns, #object
301ENTRY(\name\()_cache_fns)
302	.long	\name\()_flush_icache_all
303	.long	\name\()_flush_kern_cache_all
304	.long   \name\()_flush_kern_cache_louis
305	.long	\name\()_flush_user_cache_all
306	.long	\name\()_flush_user_cache_range
307	.long	\name\()_coherent_kern_range
308	.long	\name\()_coherent_user_range
309	.long	\name\()_flush_kern_dcache_area
310	.long	\name\()_dma_map_area
311	.long	\name\()_dma_unmap_area
312	.long	\name\()_dma_flush_range
313	.size	\name\()_cache_fns, . - \name\()_cache_fns
314.endm
315
316.macro define_tlb_functions name:req, flags_up:req, flags_smp
317	.type	\name\()_tlb_fns, #object
318ENTRY(\name\()_tlb_fns)
319	.long	\name\()_flush_user_tlb_range
320	.long	\name\()_flush_kern_tlb_range
321	.ifnb \flags_smp
322		ALT_SMP(.long	\flags_smp )
323		ALT_UP(.long	\flags_up )
324	.else
325		.long	\flags_up
326	.endif
327	.size	\name\()_tlb_fns, . - \name\()_tlb_fns
328.endm
329
330.macro globl_equ x, y
331	.globl	\x
332	.equ	\x, \y
333.endm
334
335.macro	initfn, func, base
336	.long	\func - \base
337.endm
338
339	/*
340	 * Macro to calculate the log2 size for the protection region
341	 * registers. This calculates rd = log2(size) - 1.  tmp must
342	 * not be the same register as rd.
343	 */
344.macro	pr_sz, rd, size, tmp
345	mov	\tmp, \size, lsr #12
346	mov	\rd, #11
3471:	movs	\tmp, \tmp, lsr #1
348	addne	\rd, \rd, #1
349	bne	1b
350.endm
351
352	/*
353	 * Macro to generate a protection region register value
354	 * given a pre-masked address, size, and enable bit.
355	 * Corrupts size.
356	 */
357.macro	pr_val, dest, addr, size, enable
358	pr_sz	\dest, \size, \size		@ calculate log2(size) - 1
359	orr	\dest, \addr, \dest, lsl #1	@ mask in the region size
360	orr	\dest, \dest, \enable
361.endm
362