linux/arch/powerpc/kvm/e500_tlb.h
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   1/*
   2 * Copyright (C) 2008 Freescale Semiconductor, Inc. All rights reserved.
   3 *
   4 * Author: Yu Liu, yu.liu@freescale.com
   5 *
   6 * Description:
   7 * This file is based on arch/powerpc/kvm/44x_tlb.h,
   8 * by Hollis Blanchard <hollisb@us.ibm.com>.
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License, version 2, as
  12 * published by the Free Software Foundation.
  13 */
  14
  15#ifndef __KVM_E500_TLB_H__
  16#define __KVM_E500_TLB_H__
  17
  18#include <linux/kvm_host.h>
  19#include <asm/mmu-fsl-booke.h>
  20#include <asm/tlb.h>
  21#include <asm/kvm_e500.h>
  22
  23#define KVM_E500_TLB0_WAY_SIZE_BIT      7       /* Fixed */
  24#define KVM_E500_TLB0_WAY_SIZE          (1UL << KVM_E500_TLB0_WAY_SIZE_BIT)
  25#define KVM_E500_TLB0_WAY_SIZE_MASK     (KVM_E500_TLB0_WAY_SIZE - 1)
  26
  27#define KVM_E500_TLB0_WAY_NUM_BIT       1       /* No greater than 7 */
  28#define KVM_E500_TLB0_WAY_NUM           (1UL << KVM_E500_TLB0_WAY_NUM_BIT)
  29#define KVM_E500_TLB0_WAY_NUM_MASK      (KVM_E500_TLB0_WAY_NUM - 1)
  30
  31#define KVM_E500_TLB0_SIZE  (KVM_E500_TLB0_WAY_SIZE * KVM_E500_TLB0_WAY_NUM)
  32#define KVM_E500_TLB1_SIZE  16
  33
  34#define index_of(tlbsel, esel)  (((tlbsel) << 16) | ((esel) & 0xFFFF))
  35#define tlbsel_of(index)        ((index) >> 16)
  36#define esel_of(index)          ((index) & 0xFFFF)
  37
  38#define E500_TLB_USER_PERM_MASK (MAS3_UX|MAS3_UR|MAS3_UW)
  39#define E500_TLB_SUPER_PERM_MASK (MAS3_SX|MAS3_SR|MAS3_SW)
  40#define MAS2_ATTRIB_MASK \
  41          (MAS2_X0 | MAS2_X1)
  42#define MAS3_ATTRIB_MASK \
  43          (MAS3_U0 | MAS3_U1 | MAS3_U2 | MAS3_U3 \
  44           | E500_TLB_USER_PERM_MASK | E500_TLB_SUPER_PERM_MASK)
  45
  46extern void kvmppc_dump_tlbs(struct kvm_vcpu *);
  47extern int kvmppc_e500_emul_mt_mmucsr0(struct kvmppc_vcpu_e500 *, ulong);
  48extern int kvmppc_e500_emul_tlbwe(struct kvm_vcpu *);
  49extern int kvmppc_e500_emul_tlbre(struct kvm_vcpu *);
  50extern int kvmppc_e500_emul_tlbivax(struct kvm_vcpu *, int, int);
  51extern int kvmppc_e500_emul_tlbsx(struct kvm_vcpu *, int);
  52extern int kvmppc_e500_tlb_search(struct kvm_vcpu *, gva_t, unsigned int, int);
  53extern void kvmppc_e500_tlb_put(struct kvm_vcpu *);
  54extern void kvmppc_e500_tlb_load(struct kvm_vcpu *, int);
  55extern int kvmppc_e500_tlb_init(struct kvmppc_vcpu_e500 *);
  56extern void kvmppc_e500_tlb_uninit(struct kvmppc_vcpu_e500 *);
  57extern void kvmppc_e500_tlb_setup(struct kvmppc_vcpu_e500 *);
  58
  59/* TLB helper functions */
  60static inline unsigned int get_tlb_size(const struct tlbe *tlbe)
  61{
  62        return (tlbe->mas1 >> 8) & 0xf;
  63}
  64
  65static inline gva_t get_tlb_eaddr(const struct tlbe *tlbe)
  66{
  67        return tlbe->mas2 & 0xfffff000;
  68}
  69
  70static inline u64 get_tlb_bytes(const struct tlbe *tlbe)
  71{
  72        unsigned int pgsize = get_tlb_size(tlbe);
  73        return 1ULL << 10 << (pgsize << 1);
  74}
  75
  76static inline gva_t get_tlb_end(const struct tlbe *tlbe)
  77{
  78        u64 bytes = get_tlb_bytes(tlbe);
  79        return get_tlb_eaddr(tlbe) + bytes - 1;
  80}
  81
  82static inline u64 get_tlb_raddr(const struct tlbe *tlbe)
  83{
  84        u64 rpn = tlbe->mas7;
  85        return (rpn << 32) | (tlbe->mas3 & 0xfffff000);
  86}
  87
  88static inline unsigned int get_tlb_tid(const struct tlbe *tlbe)
  89{
  90        return (tlbe->mas1 >> 16) & 0xff;
  91}
  92
  93static inline unsigned int get_tlb_ts(const struct tlbe *tlbe)
  94{
  95        return (tlbe->mas1 >> 12) & 0x1;
  96}
  97
  98static inline unsigned int get_tlb_v(const struct tlbe *tlbe)
  99{
 100        return (tlbe->mas1 >> 31) & 0x1;
 101}
 102
 103static inline unsigned int get_tlb_iprot(const struct tlbe *tlbe)
 104{
 105        return (tlbe->mas1 >> 30) & 0x1;
 106}
 107
 108static inline unsigned int get_cur_pid(struct kvm_vcpu *vcpu)
 109{
 110        return vcpu->arch.pid & 0xff;
 111}
 112
 113static inline unsigned int get_cur_spid(
 114                const struct kvmppc_vcpu_e500 *vcpu_e500)
 115{
 116        return (vcpu_e500->mas6 >> 16) & 0xff;
 117}
 118
 119static inline unsigned int get_cur_sas(
 120                const struct kvmppc_vcpu_e500 *vcpu_e500)
 121{
 122        return vcpu_e500->mas6 & 0x1;
 123}
 124
 125static inline unsigned int get_tlb_tlbsel(
 126                const struct kvmppc_vcpu_e500 *vcpu_e500)
 127{
 128        /*
 129         * Manual says that tlbsel has 2 bits wide.
 130         * Since we only have two TLBs, only lower bit is used.
 131         */
 132        return (vcpu_e500->mas0 >> 28) & 0x1;
 133}
 134
 135static inline unsigned int get_tlb_nv_bit(
 136                const struct kvmppc_vcpu_e500 *vcpu_e500)
 137{
 138        return vcpu_e500->mas0 & 0xfff;
 139}
 140
 141static inline unsigned int get_tlb_esel_bit(
 142                const struct kvmppc_vcpu_e500 *vcpu_e500)
 143{
 144        return (vcpu_e500->mas0 >> 16) & 0xfff;
 145}
 146
 147static inline unsigned int get_tlb_esel(
 148                const struct kvmppc_vcpu_e500 *vcpu_e500,
 149                int tlbsel)
 150{
 151        unsigned int esel = get_tlb_esel_bit(vcpu_e500);
 152
 153        if (tlbsel == 0) {
 154                esel &= KVM_E500_TLB0_WAY_NUM_MASK;
 155                esel |= ((vcpu_e500->mas2 >> 12) & KVM_E500_TLB0_WAY_SIZE_MASK)
 156                                << KVM_E500_TLB0_WAY_NUM_BIT;
 157        } else {
 158                esel &= KVM_E500_TLB1_SIZE - 1;
 159        }
 160
 161        return esel;
 162}
 163
 164static inline int tlbe_is_host_safe(const struct kvm_vcpu *vcpu,
 165                        const struct tlbe *tlbe)
 166{
 167        gpa_t gpa;
 168
 169        if (!get_tlb_v(tlbe))
 170                return 0;
 171
 172        /* Does it match current guest AS? */
 173        /* XXX what about IS != DS? */
 174        if (get_tlb_ts(tlbe) != !!(vcpu->arch.msr & MSR_IS))
 175                return 0;
 176
 177        gpa = get_tlb_raddr(tlbe);
 178        if (!gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT))
 179                /* Mapping is not for RAM. */
 180                return 0;
 181
 182        return 1;
 183}
 184
 185#endif /* __KVM_E500_TLB_H__ */
 186