1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * This file contains low-level functions for performing various
4 * types of TLB invalidations on various processors with no hash
7 * This file implements the following functions for all no-hash
8 * processors. Some aren't implemented for some variants. Some
9 * are inline in tlbflush.h
16 * Code mostly moved over from misc_32.S
18 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
20 * Partially rewritten by Cort Dougan (cort@cs.nmt.edu)
21 * Paul Mackerras, Kumar Gala and Benjamin Herrenschmidt.
26 #include <asm/cputable.h>
28 #include <asm/ppc_asm.h>
29 #include <asm/asm-offsets.h>
30 #include <asm/processor.h>
32 #include <asm/asm-compat.h>
33 #include <asm/feature-fixups.h>
35 #if defined(CONFIG_PPC_8xx)
38 * Nothing to do for 8xx, everything is inline
41 #elif defined(CONFIG_44x) /* Includes 47x */
44 * 440 implementation uses tlbsx/we for tlbil_va and a full sweep
45 * of the TLB for everything else.
52 * We write 16 bits of STID since 47x supports that much, we
53 * will never be passed out of bounds values on 440 (hopefully)
57 /* We have to run the search with interrupts disabled, otherwise
58 * an interrupt which causes a TLB miss can clobber the MMUCR
59 * between the mtspr and the tlbsx.
61 * Critical and Machine Check interrupts take care of saving
62 * and restoring MMUCR, so only normal interrupts have to be
70 #ifndef CONFIG_PPC_47x
71 /* On 440 There are only 64 TLB entries, so r3 < 64, which means bit
72 * 22, is clear. Since 22 is the V bit in the TLB_PAGEID, loading this
73 * value will invalidate the TLB entry.
75 tlbwe r6,r6,PPC44x_TLB_PAGEID
77 oris r7,r6,0x8000 /* specify way explicitly */
78 clrrwi r4,r3,12 /* get an EPN for the hashing with V = 0 */
79 ori r4,r4,PPC47x_TLBE_SIZE
80 tlbwe r4,r7,0 /* write it */
81 #endif /* !CONFIG_PPC_47x */
88 #ifndef CONFIG_PPC_47x
92 /* Load high watermark */
93 lis r4,tlb_44x_hwater@ha
94 lwz r5,tlb_44x_hwater@l(r4)
96 1: tlbwe r3,r3,PPC44x_TLB_PAGEID
104 /* 476 variant. There's not simple way to do this, hopefully we'll
105 * try to limit the amount of such full invalidates
107 mfmsr r11 /* Interrupts off */
109 li r3,-1 /* Current set */
110 lis r10,tlb_47x_boltmap@h
111 ori r10,r10,tlb_47x_boltmap@l
112 lis r7,0x8000 /* Specify way explicitly */
114 b 9f /* For each set */
116 1: li r9,4 /* Number of ways */
117 li r4,0 /* Current way */
118 li r6,0 /* Default entry value 0 */
119 andi. r0,r8,1 /* Check if way 0 is bolted */
120 mtctr r9 /* Load way counter */
121 bne- 3f /* Bolted, skip loading it */
123 2: /* For each way */
124 or r5,r3,r4 /* Make way|index for tlbre */
125 rlwimi r5,r5,16,8,15 /* Copy index into position */
126 tlbre r6,r5,0 /* Read entry */
127 3: addis r4,r4,0x2000 /* Next way */
128 andi. r0,r6,PPC47x_TLB0_VALID /* Valid entry ? */
129 beq 4f /* Nope, skip it */
130 rlwimi r7,r5,0,1,2 /* Insert way number */
131 rlwinm r6,r6,0,21,19 /* Clear V */
132 tlbwe r6,r7,0 /* Write it */
133 4: bdnz 2b /* Loop for each way */
134 srwi r8,r8,1 /* Next boltmap bit */
135 9: cmpwi cr1,r3,255 /* Last set done ? */
136 addi r3,r3,1 /* Next set */
137 beq cr1,1f /* End of loop */
138 andi. r0,r3,0x1f /* Need to load a new boltmap word ? */
139 bne 1b /* No, loop */
140 lwz r8,0(r10) /* Load boltmap entry */
141 addi r10,r10,4 /* Next word */
143 1: isync /* Sync shadows */
146 #endif /* !CONFIG_PPC_47x */
148 #ifdef CONFIG_PPC_47x
151 * _tlbivax_bcast is only on 47x. We don't bother doing a runtime
152 * check though, it will blow up soon enough if we mistakenly try
153 * to use it on a 440.
155 _GLOBAL(_tlbivax_bcast)
168 END_FTR_SECTION_IFSET(CPU_FTR_476_DD2)
173 * DD2 HW could hang if in instruction fetch happens before msync completes.
174 * Touch enough instruction cache lines to ensure cache hits
180 PPC_ICBT(0,R6,R7) /* touch next cache line */
182 PPC_ICBT(0,R6,R7) /* touch next cache line */
184 PPC_ICBT(0,R6,R7) /* touch next cache line */
197 #endif /* CONFIG_PPC_47x */
199 #elif defined(CONFIG_PPC_85xx)
201 * FSL BookE implementations.
203 * Since feature sections are using _SECTION_ELSE we need
204 * to have the larger code path before the _SECTION_ELSE
208 * Flush MMU TLB on the local processor
211 BEGIN_MMU_FTR_SECTION
212 li r3,(MMUCSR0_TLBFI)@l
213 mtspr SPRN_MMUCSR0, r3
215 mfspr r3,SPRN_MMUCSR0
216 andi. r3,r3,MMUCSR0_TLBFI@l
220 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_USE_TLBILX)
226 BEGIN_MMU_FTR_SECTION
230 mfspr r4,SPRN_MAS6 /* save MAS6 */
233 mtspr SPRN_MAS6,r4 /* restore MAS6 */
236 li r3,(MMUCSR0_TLBFI)@l
237 mtspr SPRN_MMUCSR0, r3
239 mfspr r3,SPRN_MMUCSR0
240 andi. r3,r3,MMUCSR0_TLBFI@l
242 ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_USE_TLBILX)
248 * Flush MMU TLB for a particular address, but only on the local processor
255 ori r4,r4,(MAS6_ISIZE(BOOK3E_PAGESZ_4K))@l
256 mtspr SPRN_MAS6,r4 /* assume AS=0 for now */
257 BEGIN_MMU_FTR_SECTION
259 mfspr r4,SPRN_MAS1 /* check valid */
260 andis. r3,r4,MAS1_VALID@h
267 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_USE_TLBILX)
272 #elif defined(CONFIG_PPC_BOOK3E_64)
274 * New Book3E (>= 2.06) implementation
276 * Note: We may be able to get away without the interrupt masking stuff
277 * if we save/restore MAS6 on exceptions that might modify it
280 slwi r4,r3,MAS6_SPID_SHIFT
290 _GLOBAL(_tlbil_pid_noind)
291 slwi r4,r3,MAS6_SPID_SHIFT
312 slwi r4,r4,MAS6_SPID_SHIFT
313 rlwimi r4,r5,MAS6_ISIZE_SHIFT,MAS6_ISIZE_MASK
315 rlwimi r4,r6,MAS6_SIND_SHIFT,MAS6_SIND
316 1: mtspr SPRN_MAS6,r4 /* assume AS=0 for now */
323 _GLOBAL(_tlbivax_bcast)
327 slwi r4,r4,MAS6_SPID_SHIFT
328 rlwimi r4,r5,MAS6_ISIZE_SHIFT,MAS6_ISIZE_MASK
330 rlwimi r4,r6,MAS6_SIND_SHIFT,MAS6_SIND
331 1: mtspr SPRN_MAS6,r4 /* assume AS=0 for now */
339 #error Unsupported processor type !
342 #if defined(CONFIG_PPC_E500)
344 * extern void loadcam_entry(unsigned int index)
346 * Load TLBCAM[index] entry in to the L2 CAM MMU
347 * Must preserve r7, r8, r9, r10, r11, r12
349 _GLOBAL(loadcam_entry)
351 LOAD_REG_ADDR_PIC(r4, TLBCAM)
353 mulli r5,r3,TLBCAM_SIZE
355 lwz r4,TLBCAM_MAS0(r3)
357 lwz r4,TLBCAM_MAS1(r3)
359 PPC_LL r4,TLBCAM_MAS2(r3)
361 lwz r4,TLBCAM_MAS3(r3)
363 BEGIN_MMU_FTR_SECTION
364 lwz r4,TLBCAM_MAS7(r3)
366 END_MMU_FTR_SECTION_IFSET(MMU_FTR_BIG_PHYS)
373 * Load multiple TLB entries at once, using an alternate-space
374 * trampoline so that we don't have to care about whether the same
375 * TLB entry maps us before and after.
377 * r3 = first entry to write
378 * r4 = number of entries to write
379 * r5 = temporary tlb entry (0 means no switch to AS1)
381 _GLOBAL(loadcam_multi)
383 /* Don't switch to AS=1 if already there */
391 * Set up temporary TLB entry that is the same as what we're
392 * running from, but in AS=1.
401 rlwimi r6,r5,MAS0_ESEL_SHIFT,MAS0_ESEL_MASK
410 ori r6,r6,MSR_IS|MSR_DS
423 /* Don't return to AS=0 if we were in AS=1 at function start */
429 /* Return to AS=0 and clear the temporary entry */
431 rlwinm. r6,r6,0,~(MSR_IS|MSR_DS)
437 rlwinm r6,r7,MAS0_ESEL_SHIFT,MAS0_ESEL_MASK
438 oris r6,r6,MAS0_TLBSEL(1)@h