1 /* SPDX-License-Identifier: GPL-2.0 */
3 * We need constants.h for:
8 #include <linux/const.h>
9 #include <asm/asm-offsets.h>
10 #include <asm/thread_info.h>
17 * vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)
19 .macro vma_vm_mm, rd, rn
20 ldr \rd, [\rn, #VMA_VM_MM]
24 * vma_vm_flags - get vma->vm_flags
26 .macro vma_vm_flags, rd, rn
27 ldr \rd, [\rn, #VMA_VM_FLAGS]
31 * act_mm - get current->active_mm
34 bic \rd, sp, #(THREAD_SIZE - 1) & ~63
36 ldr \rd, [\rd, #TI_TASK]
37 .if (TSK_ACTIVE_MM > IMM12_MASK)
38 add \rd, \rd, #TSK_ACTIVE_MM & ~IMM12_MASK
40 ldr \rd, [\rd, #TSK_ACTIVE_MM & IMM12_MASK]
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.
49 ldr \rd, [\rn, #MM_CONTEXT_ID + 4 ]
51 ldr \rd, [\rn, #MM_CONTEXT_ID]
56 * mask_asid - mask the ASID from the context ID
62 .macro crval, clear, mmuset, ucset
73 * dcache_line_size - get the minimum D-cache line size from the CTR register
76 .macro dcache_line_size, reg, tmp
78 movw \tmp, #:lower16:BASEADDR_V7M_SCB + V7M_SCB_CTR
79 movt \tmp, #:upper16:BASEADDR_V7M_SCB + V7M_SCB_CTR
82 mrc p15, 0, \tmp, c0, c0, 1 @ read ctr
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
91 * icache_line_size - get the minimum I-cache line size from the CTR register
94 .macro icache_line_size, reg, tmp
96 movw \tmp, #:lower16:BASEADDR_V7M_SCB + V7M_SCB_CTR
97 movt \tmp, #:upper16:BASEADDR_V7M_SCB + V7M_SCB_CTR
100 mrc p15, 0, \tmp, c0, c0, 1 @ read ctr
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
108 * Sanity check the PTE configuration for the code below - which makes
109 * certain assumptions about how these bits are laid out.
112 #if L_PTE_SHARED != PTE_EXT_SHARED
113 #error PTE shared bit mismatch
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
120 #endif /* CONFIG_MMU */
123 * The ARMv6 and ARMv7 set_pte_ext translation function.
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
135 .macro armv6_mt_table pfx
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
143 .long 0x00 @ L_PTE_MT_MINICACHE (not present)
144 .long PTE_EXT_TEX(1) | PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_WRITEALLOC
146 .long PTE_EXT_TEX(1) @ L_PTE_MT_DEV_WC
148 .long PTE_CACHEABLE | PTE_BUFFERABLE @ L_PTE_MT_DEV_CACHED
149 .long PTE_EXT_TEX(2) @ L_PTE_MT_DEV_NONSHARED
152 .long PTE_CACHEABLE | PTE_BUFFERABLE | PTE_EXT_APX @ L_PTE_MT_VECTORS
155 .macro armv6_set_pte_ext pfx
156 str r1, [r0], #2048 @ linux version
158 bic r3, r1, #0x000003fc
159 bic r3, r3, #PTE_TYPE_MASK
161 orr r3, r3, #PTE_EXT_AP0 | 2
163 adr ip, \pfx\()_mt_table
164 and r2, r1, #L_PTE_MT_MASK
167 eor r1, r1, #L_PTE_DIRTY
168 tst r1, #L_PTE_DIRTY|L_PTE_RDONLY
169 orrne r3, r3, #PTE_EXT_APX
172 orrne r3, r3, #PTE_EXT_AP1
173 tstne r3, #PTE_EXT_APX
175 @ user read-only -> kernel read-only
176 bicne r3, r3, #PTE_EXT_AP0
179 orrne r3, r3, #PTE_EXT_XN
184 tstne r1, #L_PTE_PRESENT
186 tstne r1, #L_PTE_NONE
190 mcr p15, 0, r0, c7, c10, 1 @ flush_pte
195 * The ARMv3, ARMv4 and ARMv5 set_pte_ext translation function,
196 * covering most CPUs except Xscale and Xscale 3.
198 * Permission translation:
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
208 .macro armv3_set_pte_ext wc_disable=1
209 str r1, [r0], #2048 @ linux version
211 eor r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY
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
217 tst r3, #L_PTE_USER @ user?
218 orrne r2, r2, #PTE_SMALL_AP_URO_SRW
220 tst r3, #L_PTE_RDONLY | L_PTE_DIRTY @ write and dirty?
221 orreq r2, r2, #PTE_SMALL_AP_UNO_SRW
223 tst r3, #L_PTE_PRESENT | L_PTE_YOUNG @ present and young?
227 #ifdef CONFIG_CPU_DCACHE_WRITETHROUGH
228 tst r2, #PTE_CACHEABLE
229 bicne r2, r2, #PTE_BUFFERABLE
232 str r2, [r0] @ hardware version
237 * Xscale set_pte_ext translation, split into two halves to cope
238 * with work-arounds. r3 must be preserved by code between these
241 * Permission translation:
243 * 0xxx 00 no acc no acc
251 .macro xscale_set_pte_ext_prologue
252 str r1, [r0] @ linux version
254 eor r3, r1, #L_PTE_PRESENT | L_PTE_YOUNG | L_PTE_DIRTY
256 bic r2, r1, #PTE_SMALL_AP_MASK @ keep C, B bits
257 orr r2, r2, #PTE_TYPE_EXT @ extended page
259 tst r3, #L_PTE_USER @ user?
260 orrne r2, r2, #PTE_EXT_AP_URO_SRW @ yes -> user r/o, system r/w
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
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
271 str r2, [r0, #2048]! @ hardware version
273 mcr p15, 0, r0, c7, c10, 1 @ clean L1 D line
274 mcr p15, 0, ip, c7, c10, 4 @ data write barrier
277 .macro define_processor_functions name:req, dabort:req, pabort:req, nommu=0, suspend=0, bugs=0
279 * If we are building for big.Little with branch predictor hardening,
280 * we need the processor function tables to remain available after boot.
282 #if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
285 .type \name\()_processor_functions, #object
287 ENTRY(\name\()_processor_functions)
290 .word cpu_\name\()_proc_init
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
301 .word cpu_\name\()_set_pte_ext
305 .word cpu_\name\()_suspend_size
306 #ifdef CONFIG_ARM_CPU_SUSPEND
307 .word cpu_\name\()_do_suspend
308 .word cpu_\name\()_do_resume
319 .size \name\()_processor_functions, . - \name\()_processor_functions
320 #if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
325 .macro define_cache_functions name:req
327 .type \name\()_cache_fns, #object
328 ENTRY(\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
343 .macro define_tlb_functions name:req, flags_up:req, flags_smp
344 .type \name\()_tlb_fns, #object
346 ENTRY(\name\()_tlb_fns)
347 .long \name\()_flush_user_tlb_range
348 .long \name\()_flush_kern_tlb_range
350 ALT_SMP(.long \flags_smp )
351 ALT_UP(.long \flags_up )
355 .size \name\()_tlb_fns, . - \name\()_tlb_fns
358 .macro globl_equ x, y
363 .macro initfn, func, base
368 * Macro to calculate the log2 size for the protection region
369 * registers. This calculates rd = log2(size) - 1. tmp must
370 * not be the same register as rd.
372 .macro pr_sz, rd, size, tmp
373 mov \tmp, \size, lsr #12
375 1: movs \tmp, \tmp, lsr #1
381 * Macro to generate a protection region register value
382 * given a pre-masked address, size, and enable bit.
385 .macro pr_val, dest, addr, size, enable
386 pr_sz \dest, \size, \size @ calculate log2(size) - 1
387 orr \dest, \addr, \dest, lsl #1 @ mask in the region size
388 orr \dest, \dest, \enable