| /* |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License, version 2, as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| * |
| * Copyright SUSE Linux Products GmbH 2009 |
| * |
| * Authors: Alexander Graf <agraf@suse.de> |
| */ |
| |
| #ifdef __LITTLE_ENDIAN__ |
| #error Need to fix SLB shadow accesses in little endian mode |
| #endif |
| |
| #define SHADOW_SLB_ESID(num) (SLBSHADOW_SAVEAREA + (num * 0x10)) |
| #define SHADOW_SLB_VSID(num) (SLBSHADOW_SAVEAREA + (num * 0x10) + 0x8) |
| #define UNBOLT_SLB_ENTRY(num) \ |
| ld r9, SHADOW_SLB_ESID(num)(r12); \ |
| /* Invalid? Skip. */; \ |
| rldicl. r0, r9, 37, 63; \ |
| beq slb_entry_skip_ ## num; \ |
| xoris r9, r9, SLB_ESID_V@h; \ |
| std r9, SHADOW_SLB_ESID(num)(r12); \ |
| slb_entry_skip_ ## num: |
| |
| #define REBOLT_SLB_ENTRY(num) \ |
| ld r10, SHADOW_SLB_ESID(num)(r11); \ |
| cmpdi r10, 0; \ |
| beq slb_exit_skip_ ## num; \ |
| oris r10, r10, SLB_ESID_V@h; \ |
| ld r9, SHADOW_SLB_VSID(num)(r11); \ |
| slbmte r9, r10; \ |
| std r10, SHADOW_SLB_ESID(num)(r11); \ |
| slb_exit_skip_ ## num: |
| |
| /****************************************************************************** |
| * * |
| * Entry code * |
| * * |
| *****************************************************************************/ |
| |
| .macro LOAD_GUEST_SEGMENTS |
| |
| /* Required state: |
| * |
| * MSR = ~IR|DR |
| * R13 = PACA |
| * R1 = host R1 |
| * R2 = host R2 |
| * R3 = shadow vcpu |
| * all other volatile GPRS = free except R4, R6 |
| * SVCPU[CR] = guest CR |
| * SVCPU[XER] = guest XER |
| * SVCPU[CTR] = guest CTR |
| * SVCPU[LR] = guest LR |
| */ |
| |
| /* Remove LPAR shadow entries */ |
| |
| #if SLB_NUM_BOLTED == 3 |
| |
| ld r12, PACA_SLBSHADOWPTR(r13) |
| |
| /* Remove bolted entries */ |
| UNBOLT_SLB_ENTRY(0) |
| UNBOLT_SLB_ENTRY(1) |
| UNBOLT_SLB_ENTRY(2) |
| |
| #else |
| #error unknown number of bolted entries |
| #endif |
| |
| /* Flush SLB */ |
| |
| li r10, 0 |
| slbmte r10, r10 |
| slbia |
| |
| /* Fill SLB with our shadow */ |
| |
| lbz r12, SVCPU_SLB_MAX(r3) |
| mulli r12, r12, 16 |
| addi r12, r12, SVCPU_SLB |
| add r12, r12, r3 |
| |
| /* for (r11 = kvm_slb; r11 < kvm_slb + kvm_slb_size; r11+=slb_entry) */ |
| li r11, SVCPU_SLB |
| add r11, r11, r3 |
| |
| slb_loop_enter: |
| |
| ld r10, 0(r11) |
| |
| rldicl. r0, r10, 37, 63 |
| beq slb_loop_enter_skip |
| |
| ld r9, 8(r11) |
| slbmte r9, r10 |
| |
| slb_loop_enter_skip: |
| addi r11, r11, 16 |
| cmpd cr0, r11, r12 |
| blt slb_loop_enter |
| |
| slb_do_enter: |
| |
| .endm |
| |
| /****************************************************************************** |
| * * |
| * Exit code * |
| * * |
| *****************************************************************************/ |
| |
| .macro LOAD_HOST_SEGMENTS |
| |
| /* Register usage at this point: |
| * |
| * R1 = host R1 |
| * R2 = host R2 |
| * R12 = exit handler id |
| * R13 = shadow vcpu - SHADOW_VCPU_OFF [=PACA on PPC64] |
| * SVCPU.* = guest * |
| * SVCPU[CR] = guest CR |
| * SVCPU[XER] = guest XER |
| * SVCPU[CTR] = guest CTR |
| * SVCPU[LR] = guest LR |
| * |
| */ |
| |
| /* Restore bolted entries from the shadow and fix it along the way */ |
| |
| /* We don't store anything in entry 0, so we don't need to take care of it */ |
| slbia |
| isync |
| |
| #if SLB_NUM_BOLTED == 3 |
| |
| ld r11, PACA_SLBSHADOWPTR(r13) |
| |
| REBOLT_SLB_ENTRY(0) |
| REBOLT_SLB_ENTRY(1) |
| REBOLT_SLB_ENTRY(2) |
| |
| #else |
| #error unknown number of bolted entries |
| #endif |
| |
| slb_do_exit: |
| |
| .endm |
