| /* SPDX-License-Identifier: GPL-2.0 */ |
| |
| /* 1. Find the index of the entry we're executing in */ |
| bl invstr /* Find our address */ |
| invstr: mflr r6 /* Make it accessible */ |
| mfmsr r7 |
| rlwinm r4,r7,27,31,31 /* extract MSR[IS] */ |
| mfspr r7, SPRN_PID0 |
| slwi r7,r7,16 |
| or r7,r7,r4 |
| mtspr SPRN_MAS6,r7 |
| tlbsx 0,r6 /* search MSR[IS], SPID=PID0 */ |
| mfspr r7,SPRN_MAS1 |
| andis. r7,r7,MAS1_VALID@h |
| bne match_TLB |
| |
| mfspr r7,SPRN_MMUCFG |
| rlwinm r7,r7,21,28,31 /* extract MMUCFG[NPIDS] */ |
| cmpwi r7,3 |
| bne match_TLB /* skip if NPIDS != 3 */ |
| |
| mfspr r7,SPRN_PID1 |
| slwi r7,r7,16 |
| or r7,r7,r4 |
| mtspr SPRN_MAS6,r7 |
| tlbsx 0,r6 /* search MSR[IS], SPID=PID1 */ |
| mfspr r7,SPRN_MAS1 |
| andis. r7,r7,MAS1_VALID@h |
| bne match_TLB |
| mfspr r7, SPRN_PID2 |
| slwi r7,r7,16 |
| or r7,r7,r4 |
| mtspr SPRN_MAS6,r7 |
| tlbsx 0,r6 /* Fall through, we had to match */ |
| |
| match_TLB: |
| mfspr r7,SPRN_MAS0 |
| rlwinm r3,r7,16,20,31 /* Extract MAS0(Entry) */ |
| |
| mfspr r7,SPRN_MAS1 /* Insure IPROT set */ |
| oris r7,r7,MAS1_IPROT@h |
| mtspr SPRN_MAS1,r7 |
| tlbwe |
| |
| /* 2. Invalidate all entries except the entry we're executing in */ |
| mfspr r9,SPRN_TLB1CFG |
| andi. r9,r9,0xfff |
| li r6,0 /* Set Entry counter to 0 */ |
| 1: lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ |
| rlwimi r7,r6,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r6) */ |
| mtspr SPRN_MAS0,r7 |
| tlbre |
| mfspr r7,SPRN_MAS1 |
| rlwinm r7,r7,0,2,31 /* Clear MAS1 Valid and IPROT */ |
| cmpw r3,r6 |
| beq skpinv /* Dont update the current execution TLB */ |
| mtspr SPRN_MAS1,r7 |
| tlbwe |
| isync |
| skpinv: addi r6,r6,1 /* Increment */ |
| cmpw r6,r9 /* Are we done? */ |
| bne 1b /* If not, repeat */ |
| |
| /* Invalidate TLB0 */ |
| li r6,0x04 |
| tlbivax 0,r6 |
| TLBSYNC |
| /* Invalidate TLB1 */ |
| li r6,0x0c |
| tlbivax 0,r6 |
| TLBSYNC |
| |
| /* 3. Setup a temp mapping and jump to it */ |
| andi. r5, r3, 0x1 /* Find an entry not used and is non-zero */ |
| addi r5, r5, 0x1 |
| lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ |
| rlwimi r7,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */ |
| mtspr SPRN_MAS0,r7 |
| tlbre |
| |
| /* grab and fixup the RPN */ |
| mfspr r6,SPRN_MAS1 /* extract MAS1[SIZE] */ |
| rlwinm r6,r6,25,27,31 |
| li r8,-1 |
| addi r6,r6,10 |
| slw r6,r8,r6 /* convert to mask */ |
| |
| bl 1f /* Find our address */ |
| 1: mflr r7 |
| |
| mfspr r8,SPRN_MAS3 |
| #ifdef CONFIG_PHYS_64BIT |
| mfspr r23,SPRN_MAS7 |
| #endif |
| and r8,r6,r8 |
| subfic r9,r6,-4096 |
| and r9,r9,r7 |
| |
| or r25,r8,r9 |
| ori r8,r25,(MAS3_SX|MAS3_SW|MAS3_SR) |
| |
| /* Just modify the entry ID and EPN for the temp mapping */ |
| lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ |
| rlwimi r7,r5,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r5) */ |
| mtspr SPRN_MAS0,r7 |
| xori r6,r4,1 /* Setup TMP mapping in the other Address space */ |
| slwi r6,r6,12 |
| oris r6,r6,(MAS1_VALID|MAS1_IPROT)@h |
| ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_4K))@l |
| mtspr SPRN_MAS1,r6 |
| mfspr r6,SPRN_MAS2 |
| li r7,0 /* temp EPN = 0 */ |
| rlwimi r7,r6,0,20,31 |
| mtspr SPRN_MAS2,r7 |
| mtspr SPRN_MAS3,r8 |
| tlbwe |
| |
| xori r6,r4,1 |
| slwi r6,r6,5 /* setup new context with other address space */ |
| bl 1f /* Find our address */ |
| 1: mflr r9 |
| rlwimi r7,r9,0,20,31 |
| addi r7,r7,(2f - 1b) |
| mtspr SPRN_SRR0,r7 |
| mtspr SPRN_SRR1,r6 |
| rfi |
| 2: |
| /* 4. Clear out PIDs & Search info */ |
| li r6,0 |
| mtspr SPRN_MAS6,r6 |
| mtspr SPRN_PID0,r6 |
| |
| mfspr r7,SPRN_MMUCFG |
| rlwinm r7,r7,21,28,31 /* extract MMUCFG[NPIDS] */ |
| cmpwi r7,3 |
| bne 2f /* skip if NPIDS != 3 */ |
| |
| mtspr SPRN_PID1,r6 |
| mtspr SPRN_PID2,r6 |
| |
| /* 5. Invalidate mapping we started in */ |
| 2: |
| lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ |
| rlwimi r7,r3,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r3) */ |
| mtspr SPRN_MAS0,r7 |
| tlbre |
| mfspr r6,SPRN_MAS1 |
| rlwinm r6,r6,0,2,0 /* clear IPROT */ |
| mtspr SPRN_MAS1,r6 |
| tlbwe |
| /* Invalidate TLB1 */ |
| li r9,0x0c |
| tlbivax 0,r9 |
| TLBSYNC |
| |
| #if defined(ENTRY_MAPPING_BOOT_SETUP) |
| |
| /* 6. Setup kernstart_virt_addr mapping in TLB1[0] */ |
| lis r6,0x1000 /* Set MAS0(TLBSEL) = TLB1(1), ESEL = 0 */ |
| mtspr SPRN_MAS0,r6 |
| lis r6,(MAS1_VALID|MAS1_IPROT)@h |
| ori r6,r6,(MAS1_TSIZE(BOOK3E_PAGESZ_64M))@l |
| mtspr SPRN_MAS1,r6 |
| lis r6,MAS2_EPN_MASK(BOOK3E_PAGESZ_64M)@h |
| ori r6,r6,MAS2_EPN_MASK(BOOK3E_PAGESZ_64M)@l |
| and r6,r6,r20 |
| ori r6,r6,MAS2_M_IF_NEEDED@l |
| mtspr SPRN_MAS2,r6 |
| mtspr SPRN_MAS3,r8 |
| tlbwe |
| |
| /* 7. Jump to kernstart_virt_addr mapping */ |
| mr r6,r20 |
| |
| #elif defined(ENTRY_MAPPING_KEXEC_SETUP) |
| /* |
| * 6. Setup a 1:1 mapping in TLB1. Esel 0 is unsued, 1 or 2 contains the tmp |
| * mapping so we start at 3. We setup 8 mappings, each 256MiB in size. This |
| * will cover the first 2GiB of memory. |
| */ |
| |
| lis r10, (MAS1_VALID|MAS1_IPROT)@h |
| ori r10,r10, (MAS1_TSIZE(BOOK3E_PAGESZ_256M))@l |
| li r11, 0 |
| li r0, 8 |
| mtctr r0 |
| |
| next_tlb_setup: |
| addi r0, r11, 3 |
| rlwinm r0, r0, 16, 4, 15 // Compute esel |
| rlwinm r9, r11, 28, 0, 3 // Compute [ER]PN |
| oris r0, r0, (MAS0_TLBSEL(1))@h |
| mtspr SPRN_MAS0,r0 |
| mtspr SPRN_MAS1,r10 |
| mtspr SPRN_MAS2,r9 |
| ori r9, r9, (MAS3_SX|MAS3_SW|MAS3_SR) |
| mtspr SPRN_MAS3,r9 |
| tlbwe |
| addi r11, r11, 1 |
| bdnz+ next_tlb_setup |
| |
| /* 7. Jump to our 1:1 mapping */ |
| mr r6, r25 |
| #else |
| #error You need to specify the mapping or not use this at all. |
| #endif |
| |
| lis r7,MSR_KERNEL@h |
| ori r7,r7,MSR_KERNEL@l |
| bl 1f /* Find our address */ |
| 1: mflr r9 |
| rlwimi r6,r9,0,20,31 |
| addi r6,r6,(2f - 1b) |
| mtspr SPRN_SRR0,r6 |
| mtspr SPRN_SRR1,r7 |
| rfi /* start execution out of TLB1[0] entry */ |
| |
| /* 8. Clear out the temp mapping */ |
| 2: lis r7,0x1000 /* Set MAS0(TLBSEL) = 1 */ |
| rlwimi r7,r5,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r5) */ |
| mtspr SPRN_MAS0,r7 |
| tlbre |
| mfspr r8,SPRN_MAS1 |
| rlwinm r8,r8,0,2,0 /* clear IPROT */ |
| mtspr SPRN_MAS1,r8 |
| tlbwe |
| /* Invalidate TLB1 */ |
| li r9,0x0c |
| tlbivax 0,r9 |
| TLBSYNC |
