xref: /openbmc/linux/arch/arm/mm/proc-macros.S (revision a44e4f3a) 
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * We need constants.h for:
4 *  VMA_VM_MM
5 *  VMA_VM_FLAGS
6 *  VM_EXEC
7 */
8#include <asm/asm-offsets.h>
9#include <asm/thread_info.h>
10
11#ifdef CONFIG_CPU_V7M
12#include <asm/v7m.h>
13#endif
14
15/*
16 * vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
17 */
18	.macro	vma_vm_mm, rd, rn
19	ldr	\rd, [\rn, #VMA_VM_MM]
20	.endm
21
22/*
23 * vma_vm_flags - get vma->vm_flags
24 */
25	.macro	vma_vm_flags, rd, rn
26	ldr	\rd, [\rn, #VMA_VM_FLAGS]
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	.if (TSK_ACTIVE_MM > IMM12_MASK)
37	add	\rd, \rd, #TSK_ACTIVE_MM & ~IMM12_MASK
38	.endif
39	ldr	\rd, [\rd, #TSK_ACTIVE_MM & IMM12_MASK]
40	.endm
41
42/*
43 * mmid - get context id from mm pointer (mm->context.id)
44 * note, this field is 64bit, so in big-endian the two words are swapped too.
45 */
46	.macro	mmid, rd, rn
47#ifdef __ARMEB__
48	ldr	\rd, [\rn, #MM_CONTEXT_ID + 4 ]
49#else
50	ldr	\rd, [\rn, #MM_CONTEXT_ID]
51#endif
52	.endm
53
54/*
55 * mask_asid - mask the ASID from the context ID
56 */
57	.macro	asid, rd, rn
58	and	\rd, \rn, #255
59	.endm
60
61	.macro	crval, clear, mmuset, ucset
62#ifdef CONFIG_MMU
63	.word	\clear
64	.word	\mmuset
65#else
66	.word	\clear
67	.word	\ucset
68#endif
69	.endm
70
71/*
72 * dcache_line_size - get the minimum D-cache line size from the CTR register
73 * on ARMv7.
74 */
75	.macro	dcache_line_size, reg, tmp
76#ifdef CONFIG_CPU_V7M
77	movw	\tmp, #:lower16:BASEADDR_V7M_SCB + V7M_SCB_CTR
78	movt	\tmp, #:upper16:BASEADDR_V7M_SCB + V7M_SCB_CTR
79	ldr     \tmp, [\tmp]
80#else
81	mrc	p15, 0, \tmp, c0, c0, 1		@ read ctr
82#endif
83	lsr	\tmp, \tmp, #16
84	and	\tmp, \tmp, #0xf		@ cache line size encoding
85	mov	\reg, #4			@ bytes per word
86	mov	\reg, \reg, lsl \tmp		@ actual cache line size
87	.endm
88
89/*
90 * icache_line_size - get the minimum I-cache line size from the CTR register
91 * on ARMv7.
92 */
93	.macro	icache_line_size, reg, tmp
94#ifdef CONFIG_CPU_V7M
95	movw	\tmp, #:lower16:BASEADDR_V7M_SCB + V7M_SCB_CTR
96	movt	\tmp, #:upper16:BASEADDR_V7M_SCB + V7M_SCB_CTR
97	ldr     \tmp, [\tmp]
98#else
99	mrc	p15, 0, \tmp, c0, c0, 1		@ read ctr
100#endif
101	and	\tmp, \tmp, #0xf		@ cache line size encoding
102	mov	\reg, #4			@ bytes per word
103	mov	\reg, \reg, lsl \tmp		@ actual cache line size
104	.endm
105
106/*
107 * Sanity check the PTE configuration for the code below - which makes
108 * certain assumptions about how these bits are laid out.
109 */
110#ifdef CONFIG_MMU
111#if L_PTE_SHARED != PTE_EXT_SHARED
112#error PTE shared bit mismatch
113#endif
114#if !defined (CONFIG_ARM_LPAE) && \
115	(L_PTE_XN+L_PTE_USER+L_PTE_RDONLY+L_PTE_DIRTY+L_PTE_YOUNG+\
116	 L_PTE_PRESENT) > L_PTE_SHARED
117#error Invalid Linux PTE bit settings
118#endif
119#endif	/* CONFIG_MMU */
120
121/*
122 * The ARMv6 and ARMv7 set_pte_ext translation function.
123 *
124 * Permission translation:
125 *  YUWD  APX AP1 AP0	SVC	User
126 *  0xxx   0   0   0	no acc	no acc
127 *  100x   1   0   1	r/o	no acc
128 *  10x0   1   0   1	r/o	no acc
129 *  1011   0   0   1	r/w	no acc
130 *  110x   1   1   1	r/o	r/o
131 *  11x0   1   1   1	r/o	r/o
132 *  1111   0   1   1	r/w	r/w
133 */
134	.macro	armv6_mt_table pfx
135\pfx\()_mt_table:
136	.long	0x00						@ L_PTE_MT_UNCACHED
137	.long	PTE_EXT_TEX(1)					@ L_PTE_MT_BUFFERABLE
138	.long	PTE_CACHEABLE					@ L_PTE_MT_WRITETHROUGH
139	.long	PTE_CACHEABLE | PTE_BUFFERABLE			@ L_PTE_MT_WRITEBACK
140	.long	PTE_BUFFERABLE					@ L_PTE_MT_DEV_SHARED
141	.long	0x00						@ unused
142	.long	0x00						@ L_PTE_MT_MINICACHE (not present)
143	.long	PTE_EXT_TEX(1) | PTE_CACHEABLE | PTE_BUFFERABLE	@ L_PTE_MT_WRITEALLOC
144	.long	0x00						@ unused
145	.long	PTE_EXT_TEX(1)					@ L_PTE_MT_DEV_WC
146	.long	0x00						@ unused
147	.long	PTE_CACHEABLE | PTE_BUFFERABLE			@ L_PTE_MT_DEV_CACHED
148	.long	PTE_EXT_TEX(2)					@ L_PTE_MT_DEV_NONSHARED
149	.long	0x00						@ unused
150	.long	0x00						@ unused
151	.long	PTE_CACHEABLE | PTE_BUFFERABLE | PTE_EXT_APX	@ L_PTE_MT_VECTORS
152	.endm
153
154	.macro	armv6_set_pte_ext pfx
155	str	r1, [r0], #2048			@ linux version
156
157	bic	r3, r1, #0x000003fc
158	bic	r3, r3, #PTE_TYPE_MASK
159	orr	r3, r3, r2
160	orr	r3, r3, #PTE_EXT_AP0 | 2
161
162	adr	ip, \pfx\()_mt_table
163	and	r2, r1, #L_PTE_MT_MASK
164	ldr	r2, [ip, r2]
165
166	eor	r1, r1, #L_PTE_DIRTY
167	tst	r1, #L_PTE_DIRTY|L_PTE_RDONLY
168	orrne	r3, r3, #PTE_EXT_APX
169
170	tst	r1, #L_PTE_USER
171	orrne	r3, r3, #PTE_EXT_AP1
172	tstne	r3, #PTE_EXT_APX
173
174	@ user read-only -> kernel read-only
175	bicne	r3, r3, #PTE_EXT_AP0
176
177	tst	r1, #L_PTE_XN
178	orrne	r3, r3, #PTE_EXT_XN
179
180	eor	r3, r3, r2
181
182	tst	r1, #L_PTE_YOUNG
183	tstne	r1, #L_PTE_PRESENT
184	moveq	r3, #0
185	tstne	r1, #L_PTE_NONE
186	movne	r3, #0
187
188	str	r3, [r0]
189	mcr	p15, 0, r0, c7, c10, 1		@ flush_pte
190	.endm
191
192
193/*
194 * The ARMv3, ARMv4 and ARMv5 set_pte_ext translation function,
195 * covering most CPUs except Xscale and Xscale 3.
196 *
197 * Permission translation:
198 *  YUWD   AP	SVC	User
199 *  0xxx  0x00	no acc	no acc
200 *  100x  0x00	r/o	no acc
201 *  10x0  0x00	r/o	no acc
202 *  1011  0x55	r/w	no acc
203 *  110x  0xaa	r/w	r/o
204 *  11x0  0xaa	r/w	r/o
205 *  1111  0xff	r/w	r/w
206 */
207	.macro	armv3_set_pte_ext wc_disable=1
208	str	r1, [r0], #2048			@ linux version
209
210	eor	r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY
211
212	bic	r2, r1, #PTE_SMALL_AP_MASK	@ keep C, B bits
213	bic	r2, r2, #PTE_TYPE_MASK
214	orr	r2, r2, #PTE_TYPE_SMALL
215
216	tst	r3, #L_PTE_USER			@ user?
217	orrne	r2, r2, #PTE_SMALL_AP_URO_SRW
218
219	tst	r3, #L_PTE_RDONLY | L_PTE_DIRTY	@ write and dirty?
220	orreq	r2, r2, #PTE_SMALL_AP_UNO_SRW
221
222	tst	r3, #L_PTE_PRESENT | L_PTE_YOUNG	@ present and young?
223	movne	r2, #0
224
225	.if	\wc_disable
226#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
227	tst	r2, #PTE_CACHEABLE
228	bicne	r2, r2, #PTE_BUFFERABLE
229#endif
230	.endif
231	str	r2, [r0]		@ hardware version
232	.endm
233
234
235/*
236 * Xscale set_pte_ext translation, split into two halves to cope
237 * with work-arounds.  r3 must be preserved by code between these
238 * two macros.
239 *
240 * Permission translation:
241 *  YUWD  AP	SVC	User
242 *  0xxx  00	no acc	no acc
243 *  100x  00	r/o	no acc
244 *  10x0  00	r/o	no acc
245 *  1011  01	r/w	no acc
246 *  110x  10	r/w	r/o
247 *  11x0  10	r/w	r/o
248 *  1111  11	r/w	r/w
249 */
250	.macro	xscale_set_pte_ext_prologue
251	str	r1, [r0]			@ linux version
252
253	eor	r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY
254
255	bic	r2, r1, #PTE_SMALL_AP_MASK	@ keep C, B bits
256	orr	r2, r2, #PTE_TYPE_EXT		@ extended page
257
258	tst	r3, #L_PTE_USER			@ user?
259	orrne	r2, r2, #PTE_EXT_AP_URO_SRW	@ yes -> user r/o, system r/w
260
261	tst	r3, #L_PTE_RDONLY | L_PTE_DIRTY	@ write and dirty?
262	orreq	r2, r2, #PTE_EXT_AP_UNO_SRW	@ yes -> user n/a, system r/w
263						@ combined with user -> user r/w
264	.endm
265
266	.macro	xscale_set_pte_ext_epilogue
267	tst	r3, #L_PTE_PRESENT | L_PTE_YOUNG	@ present and young?
268	movne	r2, #0				@ no -> fault
269
270	str	r2, [r0, #2048]!		@ hardware version
271	mov	ip, #0
272	mcr	p15, 0, r0, c7, c10, 1		@ clean L1 D line
273	mcr	p15, 0, ip, c7, c10, 4		@ data write barrier
274	.endm
275
276.macro define_processor_functions name:req, dabort:req, pabort:req, nommu=0, suspend=0, bugs=0
277/*
278 * If we are building for big.Little with branch predictor hardening,
279 * we need the processor function tables to remain available after boot.
280 */
281#if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
282	.section ".rodata"
283#endif
284	.type	\name\()_processor_functions, #object
285	.align 2
286ENTRY(\name\()_processor_functions)
287	.word	\dabort
288	.word	\pabort
289	.word	cpu_\name\()_proc_init
290	.word	\bugs
291	.word	cpu_\name\()_proc_fin
292	.word	cpu_\name\()_reset
293	.word	cpu_\name\()_do_idle
294	.word	cpu_\name\()_dcache_clean_area
295	.word	cpu_\name\()_switch_mm
296
297	.if \nommu
298	.word	0
299	.else
300	.word	cpu_\name\()_set_pte_ext
301	.endif
302
303	.if \suspend
304	.word	cpu_\name\()_suspend_size
305#ifdef CONFIG_ARM_CPU_SUSPEND
306	.word	cpu_\name\()_do_suspend
307	.word	cpu_\name\()_do_resume
308#else
309	.word	0
310	.word	0
311#endif
312	.else
313	.word	0
314	.word	0
315	.word	0
316	.endif
317
318	.size	\name\()_processor_functions, . - \name\()_processor_functions
319#if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
320	.previous
321#endif
322.endm
323
324.macro define_cache_functions name:req
325	.align 2
326	.type	\name\()_cache_fns, #object
327ENTRY(\name\()_cache_fns)
328	.long	\name\()_flush_icache_all
329	.long	\name\()_flush_kern_cache_all
330	.long   \name\()_flush_kern_cache_louis
331	.long	\name\()_flush_user_cache_all
332	.long	\name\()_flush_user_cache_range
333	.long	\name\()_coherent_kern_range
334	.long	\name\()_coherent_user_range
335	.long	\name\()_flush_kern_dcache_area
336	.long	\name\()_dma_map_area
337	.long	\name\()_dma_unmap_area
338	.long	\name\()_dma_flush_range
339	.size	\name\()_cache_fns, . - \name\()_cache_fns
340.endm
341
342.macro define_tlb_functions name:req, flags_up:req, flags_smp
343	.type	\name\()_tlb_fns, #object
344ENTRY(\name\()_tlb_fns)
345	.long	\name\()_flush_user_tlb_range
346	.long	\name\()_flush_kern_tlb_range
347	.ifnb \flags_smp
348		ALT_SMP(.long	\flags_smp )
349		ALT_UP(.long	\flags_up )
350	.else
351		.long	\flags_up
352	.endif
353	.size	\name\()_tlb_fns, . - \name\()_tlb_fns
354.endm
355
356.macro globl_equ x, y
357	.globl	\x
358	.equ	\x, \y
359.endm
360
361.macro	initfn, func, base
362	.long	\func - \base
363.endm
364
365	/*
366	 * Macro to calculate the log2 size for the protection region
367	 * registers. This calculates rd = log2(size) - 1.  tmp must
368	 * not be the same register as rd.
369	 */
370.macro	pr_sz, rd, size, tmp
371	mov	\tmp, \size, lsr #12
372	mov	\rd, #11
3731:	movs	\tmp, \tmp, lsr #1
374	addne	\rd, \rd, #1
375	bne	1b
376.endm
377
378	/*
379	 * Macro to generate a protection region register value
380	 * given a pre-masked address, size, and enable bit.
381	 * Corrupts size.
382	 */
383.macro	pr_val, dest, addr, size, enable
384	pr_sz	\dest, \size, \size		@ calculate log2(size) - 1
385	orr	\dest, \addr, \dest, lsl #1	@ mask in the region size
386	orr	\dest, \dest, \enable
387.endm
388