2 * This file contains low-level functions for performing various
3 * types of TLB invalidations on various processors with no hash
6 * This file implements the following functions for all no-hash
7 * processors. Some aren't implemented for some variants. Some
8 * are inline in tlbflush.h
15 * Code mostly moved over from misc_32.S
20 * Paul Mackerras, Kumar Gala and Benjamin Herrenschmidt.
22 * This program is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU General Public License
24 * as published by the Free Software Foundation; either version
25 * 2 of the License, or (at your option) any later version.
31 #include <asm/cputable.h>
33 #include <asm/ppc_asm.h>
34 #include <asm/asm-offsets.h>
35 #include <asm/processor.h>
37 #include <asm/asm-compat.h>
38 #include <asm/feature-fixups.h>
40 #if defined(CONFIG_40x)
43 * 40x implementation needs only tlbil_va
46 /* We run the search with interrupts disabled because we have to change
47 * the PID and I don't want to preempt when that happens.
58 /* There are only 64 TLB entries, so r3 < 64, which means bit 25 is
59 * clear. Since 25 is the V bit in the TLB_TAG, loading this value
60 * will invalidate the TLB entry. */
65 #elif defined(CONFIG_PPC_8xx)
68 * Nothing to do for 8xx, everything is inline
71 #elif defined(CONFIG_44x) /* Includes 47x */
74 * 440 implementation uses tlbsx/we for tlbil_va and a full sweep
75 * of the TLB for everything else.
82 * We write 16 bits of STID since 47x supports that much, we
83 * will never be passed out of bounds values on 440 (hopefully)
87 /* We have to run the search with interrupts disabled, otherwise
88 * an interrupt which causes a TLB miss can clobber the MMUCR
89 * between the mtspr and the tlbsx.
91 * Critical and Machine Check interrupts take care of saving
92 * and restoring MMUCR, so only normal interrupts have to be
100 BEGIN_MMU_FTR_SECTION
102 END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_47x)
103 /* On 440 There are only 64 TLB entries, so r3 < 64, which means bit
104 * 22, is clear. Since 22 is the V bit in the TLB_PAGEID, loading this
105 * value will invalidate the TLB entry.
107 tlbwe r6,r6,PPC44x_TLB_PAGEID
112 #ifdef CONFIG_PPC_47x
113 oris r7,r6,0x8000 /* specify way explicitly */
114 clrrwi r4,r3,12 /* get an EPN for the hashing with V = 0 */
115 ori r4,r4,PPC47x_TLBE_SIZE
116 tlbwe r4,r7,0 /* write it */
120 #else /* CONFIG_PPC_47x */
122 EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0;
123 #endif /* !CONFIG_PPC_47x */
127 BEGIN_MMU_FTR_SECTION
129 END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_47x)
133 /* Load high watermark */
134 lis r4,tlb_44x_hwater@ha
135 lwz r5,tlb_44x_hwater@l(r4)
137 1: tlbwe r3,r3,PPC44x_TLB_PAGEID
145 #ifdef CONFIG_PPC_47x
146 /* 476 variant. There's not simple way to do this, hopefully we'll
147 * try to limit the amount of such full invalidates
149 mfmsr r11 /* Interrupts off */
151 li r3,-1 /* Current set */
152 lis r10,tlb_47x_boltmap@h
153 ori r10,r10,tlb_47x_boltmap@l
154 lis r7,0x8000 /* Specify way explicitly */
156 b 9f /* For each set */
158 1: li r9,4 /* Number of ways */
159 li r4,0 /* Current way */
160 li r6,0 /* Default entry value 0 */
161 andi. r0,r8,1 /* Check if way 0 is bolted */
162 mtctr r9 /* Load way counter */
163 bne- 3f /* Bolted, skip loading it */
165 2: /* For each way */
166 or r5,r3,r4 /* Make way|index for tlbre */
167 rlwimi r5,r5,16,8,15 /* Copy index into position */
168 tlbre r6,r5,0 /* Read entry */
169 3: addis r4,r4,0x2000 /* Next way */
170 andi. r0,r6,PPC47x_TLB0_VALID /* Valid entry ? */
171 beq 4f /* Nope, skip it */
172 rlwimi r7,r5,0,1,2 /* Insert way number */
173 rlwinm r6,r6,0,21,19 /* Clear V */
174 tlbwe r6,r7,0 /* Write it */
175 4: bdnz 2b /* Loop for each way */
176 srwi r8,r8,1 /* Next boltmap bit */
177 9: cmpwi cr1,r3,255 /* Last set done ? */
178 addi r3,r3,1 /* Next set */
179 beq cr1,1f /* End of loop */
180 andi. r0,r3,0x1f /* Need to load a new boltmap word ? */
181 bne 1b /* No, loop */
182 lwz r8,0(r10) /* Load boltmap entry */
183 addi r10,r10,4 /* Next word */
185 1: isync /* Sync shadows */
187 #else /* CONFIG_PPC_47x */
189 EMIT_BUG_ENTRY 1b,__FILE__,__LINE__,0;
190 #endif /* !CONFIG_PPC_47x */
193 #ifdef CONFIG_PPC_47x
196 * _tlbivax_bcast is only on 47x. We don't bother doing a runtime
197 * check though, it will blow up soon enough if we mistakenly try
198 * to use it on a 440.
200 _GLOBAL(_tlbivax_bcast)
213 END_FTR_SECTION_IFSET(CPU_FTR_476_DD2)
218 * DD2 HW could hang if in instruction fetch happens before msync completes.
219 * Touch enough instruction cache lines to ensure cache hits
225 PPC_ICBT(0,R6,R7) /* touch next cache line */
227 PPC_ICBT(0,R6,R7) /* touch next cache line */
229 PPC_ICBT(0,R6,R7) /* touch next cache line */
242 #endif /* CONFIG_PPC_47x */
244 #elif defined(CONFIG_FSL_BOOKE)
246 * FSL BookE implementations.
248 * Since feature sections are using _SECTION_ELSE we need
249 * to have the larger code path before the _SECTION_ELSE
253 * Flush MMU TLB on the local processor
256 BEGIN_MMU_FTR_SECTION
257 li r3,(MMUCSR0_TLBFI)@l
258 mtspr SPRN_MMUCSR0, r3
260 mfspr r3,SPRN_MMUCSR0
261 andi. r3,r3,MMUCSR0_TLBFI@l
265 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_USE_TLBILX)
271 BEGIN_MMU_FTR_SECTION
275 mfspr r4,SPRN_MAS6 /* save MAS6 */
278 mtspr SPRN_MAS6,r4 /* restore MAS6 */
281 li r3,(MMUCSR0_TLBFI)@l
282 mtspr SPRN_MMUCSR0, r3
284 mfspr r3,SPRN_MMUCSR0
285 andi. r3,r3,MMUCSR0_TLBFI@l
287 ALT_MMU_FTR_SECTION_END_IFSET(MMU_FTR_USE_TLBILX)
293 * Flush MMU TLB for a particular address, but only on the local processor
300 ori r4,r4,(MAS6_ISIZE(BOOK3E_PAGESZ_4K))@l
301 mtspr SPRN_MAS6,r4 /* assume AS=0 for now */
302 BEGIN_MMU_FTR_SECTION
304 mfspr r4,SPRN_MAS1 /* check valid */
305 andis. r3,r4,MAS1_VALID@h
312 ALT_MMU_FTR_SECTION_END_IFCLR(MMU_FTR_USE_TLBILX)
317 #elif defined(CONFIG_PPC_BOOK3E)
319 * New Book3E (>= 2.06) implementation
321 * Note: We may be able to get away without the interrupt masking stuff
322 * if we save/restore MAS6 on exceptions that might modify it
325 slwi r4,r3,MAS6_SPID_SHIFT
335 _GLOBAL(_tlbil_pid_noind)
336 slwi r4,r3,MAS6_SPID_SHIFT
357 slwi r4,r4,MAS6_SPID_SHIFT
358 rlwimi r4,r5,MAS6_ISIZE_SHIFT,MAS6_ISIZE_MASK
360 rlwimi r4,r6,MAS6_SIND_SHIFT,MAS6_SIND
361 1: mtspr SPRN_MAS6,r4 /* assume AS=0 for now */
368 _GLOBAL(_tlbivax_bcast)
372 slwi r4,r4,MAS6_SPID_SHIFT
373 rlwimi r4,r5,MAS6_ISIZE_SHIFT,MAS6_ISIZE_MASK
375 rlwimi r4,r6,MAS6_SIND_SHIFT,MAS6_SIND
376 1: mtspr SPRN_MAS6,r4 /* assume AS=0 for now */
385 #ifdef CONFIG_BDI_SWITCH
386 /* Context switch the PTE pointer for the Abatron BDI2000.
387 * The PGDIR is the second parameter.
389 lis r5, abatron_pteptrs@h
390 ori r5, r5, abatron_pteptrs@l
394 isync /* Force context change */
397 #error Unsupported processor type !
400 #if defined(CONFIG_PPC_FSL_BOOK3E)
402 * extern void loadcam_entry(unsigned int index)
404 * Load TLBCAM[index] entry in to the L2 CAM MMU
405 * Must preserve r7, r8, r9, and r10
407 _GLOBAL(loadcam_entry)
409 LOAD_REG_ADDR_PIC(r4, TLBCAM)
411 mulli r5,r3,TLBCAM_SIZE
413 lwz r4,TLBCAM_MAS0(r3)
415 lwz r4,TLBCAM_MAS1(r3)
417 PPC_LL r4,TLBCAM_MAS2(r3)
419 lwz r4,TLBCAM_MAS3(r3)
421 BEGIN_MMU_FTR_SECTION
422 lwz r4,TLBCAM_MAS7(r3)
424 END_MMU_FTR_SECTION_IFSET(MMU_FTR_BIG_PHYS)
431 * Load multiple TLB entries at once, using an alternate-space
432 * trampoline so that we don't have to care about whether the same
433 * TLB entry maps us before and after.
435 * r3 = first entry to write
436 * r4 = number of entries to write
437 * r5 = temporary tlb entry
439 _GLOBAL(loadcam_multi)
443 * Set up temporary TLB entry that is the same as what we're
444 * running from, but in AS=1.
453 rlwimi r6,r5,MAS0_ESEL_SHIFT,MAS0_ESEL_MASK
462 ori r6,r6,MSR_IS|MSR_DS
474 /* Return to AS=0 and clear the temporary entry */
476 rlwinm. r6,r6,0,~(MSR_IS|MSR_DS)
482 rlwinm r6,r7,MAS0_ESEL_SHIFT,MAS0_ESEL_MASK
483 oris r6,r6,MAS0_TLBSEL(1)@h