xref: /openbmc/linux/arch/arm/mm/proc-macros.S (revision 14474950) 
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 <linux/const.h>
9#include <asm/asm-offsets.h>
10#include <asm/thread_info.h>
11
12#ifdef CONFIG_CPU_V7M
13#include <asm/v7m.h>
14#endif
15
16/*
17 * vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
18 */
19	.macro	vma_vm_mm, rd, rn
20	ldr	\rd, [\rn, #VMA_VM_MM]
21	.endm
22
23/*
24 * vma_vm_flags - get vma->vm_flags
25 */
26	.macro	vma_vm_flags, rd, rn
27	ldr	\rd, [\rn, #VMA_VM_FLAGS]
28	.endm
29
30/*
31 * act_mm - get current->active_mm
32 */
33	.macro	act_mm, rd
34	bic	\rd, sp, #(THREAD_SIZE - 1) & ~63
35	bic	\rd, \rd, #63
36	ldr	\rd, [\rd, #TI_TASK]
37	.if (TSK_ACTIVE_MM > IMM12_MASK)
38	add	\rd, \rd, #TSK_ACTIVE_MM & ~IMM12_MASK
39	.endif
40	ldr	\rd, [\rd, #TSK_ACTIVE_MM & IMM12_MASK]
41	.endm
42
43/*
44 * mmid - get context id from mm pointer (mm->context.id)
45 * note, this field is 64bit, so in big-endian the two words are swapped too.
46 */
47	.macro	mmid, rd, rn
48#ifdef __ARMEB__
49	ldr	\rd, [\rn, #MM_CONTEXT_ID + 4 ]
50#else
51	ldr	\rd, [\rn, #MM_CONTEXT_ID]
52#endif
53	.endm
54
55/*
56 * mask_asid - mask the ASID from the context ID
57 */
58	.macro	asid, rd, rn
59	and	\rd, \rn, #255
60	.endm
61
62	.macro	crval, clear, mmuset, ucset
63#ifdef CONFIG_MMU
64	.word	\clear
65	.word	\mmuset
66#else
67	.word	\clear
68	.word	\ucset
69#endif
70	.endm
71
72/*
73 * dcache_line_size - get the minimum D-cache line size from the CTR register
74 * on ARMv7.
75 */
76	.macro	dcache_line_size, reg, tmp
77#ifdef CONFIG_CPU_V7M
78	movw	\tmp, #:lower16:BASEADDR_V7M_SCB + V7M_SCB_CTR
79	movt	\tmp, #:upper16:BASEADDR_V7M_SCB + V7M_SCB_CTR
80	ldr     \tmp, [\tmp]
81#else
82	mrc	p15, 0, \tmp, c0, c0, 1		@ read ctr
83#endif
84	lsr	\tmp, \tmp, #16
85	and	\tmp, \tmp, #0xf		@ cache line size encoding
86	mov	\reg, #4			@ bytes per word
87	mov	\reg, \reg, lsl \tmp		@ actual cache line size
88	.endm
89
90/*
91 * icache_line_size - get the minimum I-cache line size from the CTR register
92 * on ARMv7.
93 */
94	.macro	icache_line_size, reg, tmp
95#ifdef CONFIG_CPU_V7M
96	movw	\tmp, #:lower16:BASEADDR_V7M_SCB + V7M_SCB_CTR
97	movt	\tmp, #:upper16:BASEADDR_V7M_SCB + V7M_SCB_CTR
98	ldr     \tmp, [\tmp]
99#else
100	mrc	p15, 0, \tmp, c0, c0, 1		@ read ctr
101#endif
102	and	\tmp, \tmp, #0xf		@ cache line size encoding
103	mov	\reg, #4			@ bytes per word
104	mov	\reg, \reg, lsl \tmp		@ actual cache line size
105	.endm
106
107/*
108 * Sanity check the PTE configuration for the code below - which makes
109 * certain assumptions about how these bits are laid out.
110 */
111#ifdef CONFIG_MMU
112#if L_PTE_SHARED != PTE_EXT_SHARED
113#error PTE shared bit mismatch
114#endif
115#if !defined (CONFIG_ARM_LPAE) && \
116	(L_PTE_XN+L_PTE_USER+L_PTE_RDONLY+L_PTE_DIRTY+L_PTE_YOUNG+\
117	 L_PTE_PRESENT) > L_PTE_SHARED
118#error Invalid Linux PTE bit settings
119#endif
120#endif	/* CONFIG_MMU */
121
122/*
123 * The ARMv6 and ARMv7 set_pte_ext translation function.
124 *
125 * Permission translation:
126 *  YUWD  APX AP1 AP0	SVC	User
127 *  0xxx   0   0   0	no acc	no acc
128 *  100x   1   0   1	r/o	no acc
129 *  10x0   1   0   1	r/o	no acc
130 *  1011   0   0   1	r/w	no acc
131 *  110x   1   1   1	r/o	r/o
132 *  11x0   1   1   1	r/o	r/o
133 *  1111   0   1   1	r/w	r/w
134 */
135	.macro	armv6_mt_table pfx
136\pfx\()_mt_table:
137	.long	0x00						@ L_PTE_MT_UNCACHED
138	.long	PTE_EXT_TEX(1)					@ L_PTE_MT_BUFFERABLE
139	.long	PTE_CACHEABLE					@ L_PTE_MT_WRITETHROUGH
140	.long	PTE_CACHEABLE | PTE_BUFFERABLE			@ L_PTE_MT_WRITEBACK
141	.long	PTE_BUFFERABLE					@ L_PTE_MT_DEV_SHARED
142	.long	0x00						@ unused
143	.long	0x00						@ L_PTE_MT_MINICACHE (not present)
144	.long	PTE_EXT_TEX(1) | PTE_CACHEABLE | PTE_BUFFERABLE	@ L_PTE_MT_WRITEALLOC
145	.long	0x00						@ unused
146	.long	PTE_EXT_TEX(1)					@ L_PTE_MT_DEV_WC
147	.long	0x00						@ unused
148	.long	PTE_CACHEABLE | PTE_BUFFERABLE			@ L_PTE_MT_DEV_CACHED
149	.long	PTE_EXT_TEX(2)					@ L_PTE_MT_DEV_NONSHARED
150	.long	0x00						@ unused
151	.long	0x00						@ unused
152	.long	PTE_CACHEABLE | PTE_BUFFERABLE | PTE_EXT_APX	@ L_PTE_MT_VECTORS
153	.endm
154
155	.macro	armv6_set_pte_ext pfx
156	str	r1, [r0], #2048			@ linux version
157
158	bic	r3, r1, #0x000003fc
159	bic	r3, r3, #PTE_TYPE_MASK
160	orr	r3, r3, r2
161	orr	r3, r3, #PTE_EXT_AP0 | 2
162
163	adr	ip, \pfx\()_mt_table
164	and	r2, r1, #L_PTE_MT_MASK
165	ldr	r2, [ip, r2]
166
167	eor	r1, r1, #L_PTE_DIRTY
168	tst	r1, #L_PTE_DIRTY|L_PTE_RDONLY
169	orrne	r3, r3, #PTE_EXT_APX
170
171	tst	r1, #L_PTE_USER
172	orrne	r3, r3, #PTE_EXT_AP1
173	tstne	r3, #PTE_EXT_APX
174
175	@ user read-only -> kernel read-only
176	bicne	r3, r3, #PTE_EXT_AP0
177
178	tst	r1, #L_PTE_XN
179	orrne	r3, r3, #PTE_EXT_XN
180
181	eor	r3, r3, r2
182
183	tst	r1, #L_PTE_YOUNG
184	tstne	r1, #L_PTE_PRESENT
185	moveq	r3, #0
186	tstne	r1, #L_PTE_NONE
187	movne	r3, #0
188
189	str	r3, [r0]
190	mcr	p15, 0, r0, c7, c10, 1		@ flush_pte
191	.endm
192
193
194/*
195 * The ARMv3, ARMv4 and ARMv5 set_pte_ext translation function,
196 * covering most CPUs except Xscale and Xscale 3.
197 *
198 * Permission translation:
199 *  YUWD   AP	SVC	User
200 *  0xxx  0x00	no acc	no acc
201 *  100x  0x00	r/o	no acc
202 *  10x0  0x00	r/o	no acc
203 *  1011  0x55	r/w	no acc
204 *  110x  0xaa	r/w	r/o
205 *  11x0  0xaa	r/w	r/o
206 *  1111  0xff	r/w	r/w
207 */
208	.macro	armv3_set_pte_ext wc_disable=1
209	str	r1, [r0], #2048			@ linux version
210
211	eor	r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY
212
213	bic	r2, r1, #PTE_SMALL_AP_MASK	@ keep C, B bits
214	bic	r2, r2, #PTE_TYPE_MASK
215	orr	r2, r2, #PTE_TYPE_SMALL
216
217	tst	r3, #L_PTE_USER			@ user?
218	orrne	r2, r2, #PTE_SMALL_AP_URO_SRW
219
220	tst	r3, #L_PTE_RDONLY | L_PTE_DIRTY	@ write and dirty?
221	orreq	r2, r2, #PTE_SMALL_AP_UNO_SRW
222
223	tst	r3, #L_PTE_PRESENT | L_PTE_YOUNG	@ present and young?
224	movne	r2, #0
225
226	.if	\wc_disable
227#ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
228	tst	r2, #PTE_CACHEABLE
229	bicne	r2, r2, #PTE_BUFFERABLE
230#endif
231	.endif
232	str	r2, [r0]		@ hardware version
233	.endm
234
235
236/*
237 * Xscale set_pte_ext translation, split into two halves to cope
238 * with work-arounds.  r3 must be preserved by code between these
239 * two macros.
240 *
241 * Permission translation:
242 *  YUWD  AP	SVC	User
243 *  0xxx  00	no acc	no acc
244 *  100x  00	r/o	no acc
245 *  10x0  00	r/o	no acc
246 *  1011  01	r/w	no acc
247 *  110x  10	r/w	r/o
248 *  11x0  10	r/w	r/o
249 *  1111  11	r/w	r/w
250 */
251	.macro	xscale_set_pte_ext_prologue
252	str	r1, [r0]			@ linux version
253
254	eor	r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY
255
256	bic	r2, r1, #PTE_SMALL_AP_MASK	@ keep C, B bits
257	orr	r2, r2, #PTE_TYPE_EXT		@ extended page
258
259	tst	r3, #L_PTE_USER			@ user?
260	orrne	r2, r2, #PTE_EXT_AP_URO_SRW	@ yes -> user r/o, system r/w
261
262	tst	r3, #L_PTE_RDONLY | L_PTE_DIRTY	@ write and dirty?
263	orreq	r2, r2, #PTE_EXT_AP_UNO_SRW	@ yes -> user n/a, system r/w
264						@ combined with user -> user r/w
265	.endm
266
267	.macro	xscale_set_pte_ext_epilogue
268	tst	r3, #L_PTE_PRESENT | L_PTE_YOUNG	@ present and young?
269	movne	r2, #0				@ no -> fault
270
271	str	r2, [r0, #2048]!		@ hardware version
272	mov	ip, #0
273	mcr	p15, 0, r0, c7, c10, 1		@ clean L1 D line
274	mcr	p15, 0, ip, c7, c10, 4		@ data write barrier
275	.endm
276
277.macro define_processor_functions name:req, dabort:req, pabort:req, nommu=0, suspend=0, bugs=0
278/*
279 * If we are building for big.Little with branch predictor hardening,
280 * we need the processor function tables to remain available after boot.
281 */
282#if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
283	.section ".rodata"
284#endif
285	.type	\name\()_processor_functions, #object
286	.align 2
287ENTRY(\name\()_processor_functions)
288	.word	\dabort
289	.word	\pabort
290	.word	cpu_\name\()_proc_init
291	.word	\bugs
292	.word	cpu_\name\()_proc_fin
293	.word	cpu_\name\()_reset
294	.word	cpu_\name\()_do_idle
295	.word	cpu_\name\()_dcache_clean_area
296	.word	cpu_\name\()_switch_mm
297
298	.if \nommu
299	.word	0
300	.else
301	.word	cpu_\name\()_set_pte_ext
302	.endif
303
304	.if \suspend
305	.word	cpu_\name\()_suspend_size
306#ifdef CONFIG_ARM_CPU_SUSPEND
307	.word	cpu_\name\()_do_suspend
308	.word	cpu_\name\()_do_resume
309#else
310	.word	0
311	.word	0
312#endif
313	.else
314	.word	0
315	.word	0
316	.word	0
317	.endif
318
319	.size	\name\()_processor_functions, . - \name\()_processor_functions
320#if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
321	.previous
322#endif
323.endm
324
325.macro define_cache_functions name:req
326	.align 2
327	.type	\name\()_cache_fns, #object
328ENTRY(\name\()_cache_fns)
329	.long	\name\()_flush_icache_all
330	.long	\name\()_flush_kern_cache_all
331	.long   \name\()_flush_kern_cache_louis
332	.long	\name\()_flush_user_cache_all
333	.long	\name\()_flush_user_cache_range
334	.long	\name\()_coherent_kern_range
335	.long	\name\()_coherent_user_range
336	.long	\name\()_flush_kern_dcache_area
337	.long	\name\()_dma_map_area
338	.long	\name\()_dma_unmap_area
339	.long	\name\()_dma_flush_range
340	.size	\name\()_cache_fns, . - \name\()_cache_fns
341.endm
342
343.macro define_tlb_functions name:req, flags_up:req, flags_smp
344	.type	\name\()_tlb_fns, #object
345ENTRY(\name\()_tlb_fns)
346	.long	\name\()_flush_user_tlb_range
347	.long	\name\()_flush_kern_tlb_range
348	.ifnb \flags_smp
349		ALT_SMP(.long	\flags_smp )
350		ALT_UP(.long	\flags_up )
351	.else
352		.long	\flags_up
353	.endif
354	.size	\name\()_tlb_fns, . - \name\()_tlb_fns
355.endm
356
357.macro globl_equ x, y
358	.globl	\x
359	.equ	\x, \y
360.endm
361
362.macro	initfn, func, base
363	.long	\func - \base
364.endm
365
366	/*
367	 * Macro to calculate the log2 size for the protection region
368	 * registers. This calculates rd = log2(size) - 1.  tmp must
369	 * not be the same register as rd.
370	 */
371.macro	pr_sz, rd, size, tmp
372	mov	\tmp, \size, lsr #12
373	mov	\rd, #11
3741:	movs	\tmp, \tmp, lsr #1
375	addne	\rd, \rd, #1
376	bne	1b
377.endm
378
379	/*
380	 * Macro to generate a protection region register value
381	 * given a pre-masked address, size, and enable bit.
382	 * Corrupts size.
383	 */
384.macro	pr_val, dest, addr, size, enable
385	pr_sz	\dest, \size, \size		@ calculate log2(size) - 1
386	orr	\dest, \addr, \dest, lsl #1	@ mask in the region size
387	orr	\dest, \dest, \enable
388.endm
389