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132 lines
3.1 KiB
132 lines
3.1 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* |
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* Copyright SUSE Linux Products GmbH 2009 |
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* |
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* Authors: Alexander Graf <agraf@suse.de> |
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*/ |
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/****************************************************************************** |
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* * |
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* Entry code * |
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* * |
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*****************************************************************************/ |
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.macro LOAD_GUEST_SEGMENTS |
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/* Required state: |
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* |
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* MSR = ~IR|DR |
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* R1 = host R1 |
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* R2 = host R2 |
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* R3 = shadow vcpu |
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* all other volatile GPRS = free except R4, R6 |
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* SVCPU[CR] = guest CR |
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* SVCPU[XER] = guest XER |
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* SVCPU[CTR] = guest CTR |
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* SVCPU[LR] = guest LR |
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*/ |
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#define XCHG_SR(n) lwz r9, (SVCPU_SR+(n*4))(r3); \ |
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mtsr n, r9 |
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XCHG_SR(0) |
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XCHG_SR(1) |
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XCHG_SR(2) |
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XCHG_SR(3) |
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XCHG_SR(4) |
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XCHG_SR(5) |
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XCHG_SR(6) |
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XCHG_SR(7) |
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XCHG_SR(8) |
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XCHG_SR(9) |
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XCHG_SR(10) |
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XCHG_SR(11) |
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XCHG_SR(12) |
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XCHG_SR(13) |
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XCHG_SR(14) |
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XCHG_SR(15) |
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/* Clear BATs. */ |
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#define KVM_KILL_BAT(n, reg) \ |
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mtspr SPRN_IBAT##n##U,reg; \ |
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mtspr SPRN_IBAT##n##L,reg; \ |
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mtspr SPRN_DBAT##n##U,reg; \ |
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mtspr SPRN_DBAT##n##L,reg; \ |
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li r9, 0 |
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KVM_KILL_BAT(0, r9) |
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KVM_KILL_BAT(1, r9) |
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KVM_KILL_BAT(2, r9) |
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KVM_KILL_BAT(3, r9) |
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.endm |
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/****************************************************************************** |
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* * |
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* Exit code * |
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* * |
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*****************************************************************************/ |
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.macro LOAD_HOST_SEGMENTS |
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/* Register usage at this point: |
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* |
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* R1 = host R1 |
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* R2 = host R2 |
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* R12 = exit handler id |
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* R13 = shadow vcpu - SHADOW_VCPU_OFF |
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* SVCPU.* = guest * |
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* SVCPU[CR] = guest CR |
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* SVCPU[XER] = guest XER |
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* SVCPU[CTR] = guest CTR |
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* SVCPU[LR] = guest LR |
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* |
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*/ |
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/* Restore BATs */ |
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/* We only overwrite the upper part, so we only restoree |
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the upper part. */ |
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#define KVM_LOAD_BAT(n, reg, RA, RB) \ |
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lwz RA,(n*16)+0(reg); \ |
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lwz RB,(n*16)+4(reg); \ |
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mtspr SPRN_IBAT##n##U,RA; \ |
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mtspr SPRN_IBAT##n##L,RB; \ |
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lwz RA,(n*16)+8(reg); \ |
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lwz RB,(n*16)+12(reg); \ |
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mtspr SPRN_DBAT##n##U,RA; \ |
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mtspr SPRN_DBAT##n##L,RB; \ |
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lis r9, BATS@ha |
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addi r9, r9, BATS@l |
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tophys(r9, r9) |
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KVM_LOAD_BAT(0, r9, r10, r11) |
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KVM_LOAD_BAT(1, r9, r10, r11) |
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KVM_LOAD_BAT(2, r9, r10, r11) |
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KVM_LOAD_BAT(3, r9, r10, r11) |
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/* Restore Segment Registers */ |
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/* 0xc - 0xf */ |
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li r0, 4 |
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mtctr r0 |
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LOAD_REG_IMMEDIATE(r3, 0x20000000 | (0x111 * 0xc)) |
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lis r4, 0xc000 |
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3: mtsrin r3, r4 |
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addi r3, r3, 0x111 /* increment VSID */ |
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addis r4, r4, 0x1000 /* address of next segment */ |
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bdnz 3b |
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/* 0x0 - 0xb */ |
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/* 'current->mm' needs to be in r4 */ |
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tophys(r4, r2) |
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lwz r4, MM(r4) |
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tophys(r4, r4) |
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/* This only clobbers r0, r3, r4 and r5 */ |
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bl switch_mmu_context |
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.endm
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