LXR linux/arch/arm/kvm/coproc.h

   1/*
   2 * Copyright (C) 2012 - Virtual Open Systems and Columbia University
   3 * Authors: Christoffer Dall <c.dall@virtualopensystems.com>
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License, version 2, as
   7 * published by the Free Software Foundation.
   8 *
   9 * This program is distributed in the hope that it will be useful,
  10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 * GNU General Public License for more details.
  13 *
  14 * You should have received a copy of the GNU General Public License
  15 * along with this program; if not, write to the Free Software
  16 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  17 */
  18
  19#ifndef __ARM_KVM_COPROC_LOCAL_H__
  20#define __ARM_KVM_COPROC_LOCAL_H__
  21
  22struct coproc_params {
  23        unsigned long CRn;
  24        unsigned long CRm;
  25        unsigned long Op1;
  26        unsigned long Op2;
  27        unsigned long Rt1;
  28        unsigned long Rt2;
  29        bool is_64bit;
  30        bool is_write;
  31};
  32
  33struct coproc_reg {
  34        /* MRC/MCR/MRRC/MCRR instruction which accesses it. */
  35        unsigned long CRn;
  36        unsigned long CRm;
  37        unsigned long Op1;
  38        unsigned long Op2;
  39
  40        bool is_64bit;
  41
  42        /* Trapped access from guest, if non-NULL. */
  43        bool (*access)(struct kvm_vcpu *,
  44                       const struct coproc_params *,
  45                       const struct coproc_reg *);
  46
  47        /* Initialization for vcpu. */
  48        void (*reset)(struct kvm_vcpu *, const struct coproc_reg *);
  49
  50        /* Index into vcpu_cp15(vcpu, ...), or 0 if we don't need to save it. */
  51        unsigned long reg;
  52
  53        /* Value (usually reset value) */
  54        u64 val;
  55};
  56
  57static inline void print_cp_instr(const struct coproc_params *p)
  58{
  59        /* Look, we even formatted it for you to paste into the table! */
  60        if (p->is_64bit) {
  61                kvm_pr_unimpl(" { CRm64(%2lu), Op1(%2lu), is64, func_%s },\n",
  62                              p->CRn, p->Op1, p->is_write ? "write" : "read");
  63        } else {
  64                kvm_pr_unimpl(" { CRn(%2lu), CRm(%2lu), Op1(%2lu), Op2(%2lu), is32,"
  65                              " func_%s },\n",
  66                              p->CRn, p->CRm, p->Op1, p->Op2,
  67                              p->is_write ? "write" : "read");
  68        }
  69}
  70
  71static inline bool ignore_write(struct kvm_vcpu *vcpu,
  72                                const struct coproc_params *p)
  73{
  74        return true;
  75}
  76
  77static inline bool read_zero(struct kvm_vcpu *vcpu,
  78                             const struct coproc_params *p)
  79{
  80        *vcpu_reg(vcpu, p->Rt1) = 0;
  81        return true;
  82}
  83
  84static inline bool write_to_read_only(struct kvm_vcpu *vcpu,
  85                                      const struct coproc_params *params)
  86{
  87        kvm_debug("CP15 write to read-only register at: %08lx\n",
  88                  *vcpu_pc(vcpu));
  89        print_cp_instr(params);
  90        return false;
  91}
  92
  93static inline bool read_from_write_only(struct kvm_vcpu *vcpu,
  94                                        const struct coproc_params *params)
  95{
  96        kvm_debug("CP15 read to write-only register at: %08lx\n",
  97                  *vcpu_pc(vcpu));
  98        print_cp_instr(params);
  99        return false;
 100}
 101
 102/* Reset functions */
 103static inline void reset_unknown(struct kvm_vcpu *vcpu,
 104                                 const struct coproc_reg *r)
 105{
 106        BUG_ON(!r->reg);
 107        BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
 108        vcpu_cp15(vcpu, r->reg) = 0xdecafbad;
 109}
 110
 111static inline void reset_val(struct kvm_vcpu *vcpu, const struct coproc_reg *r)
 112{
 113        BUG_ON(!r->reg);
 114        BUG_ON(r->reg >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
 115        vcpu_cp15(vcpu, r->reg) = r->val;
 116}
 117
 118static inline void reset_unknown64(struct kvm_vcpu *vcpu,
 119                                   const struct coproc_reg *r)
 120{
 121        BUG_ON(!r->reg);
 122        BUG_ON(r->reg + 1 >= ARRAY_SIZE(vcpu->arch.ctxt.cp15));
 123
 124        vcpu_cp15(vcpu, r->reg) = 0xdecafbad;
 125        vcpu_cp15(vcpu, r->reg+1) = 0xd0c0ffee;
 126}
 127
 128static inline int cmp_reg(const struct coproc_reg *i1,
 129                          const struct coproc_reg *i2)
 130{
 131        BUG_ON(i1 == i2);
 132        if (!i1)
 133                return 1;
 134        else if (!i2)
 135                return -1;
 136        if (i1->CRn != i2->CRn)
 137                return i1->CRn - i2->CRn;
 138        if (i1->CRm != i2->CRm)
 139                return i1->CRm - i2->CRm;
 140        if (i1->Op1 != i2->Op1)
 141                return i1->Op1 - i2->Op1;
 142        if (i1->Op2 != i2->Op2)
 143                return i1->Op2 - i2->Op2;
 144        return i2->is_64bit - i1->is_64bit;
 145}
 146
 147
 148#define CRn(_x)         .CRn = _x
 149#define CRm(_x)         .CRm = _x
 150#define CRm64(_x)       .CRn = _x, .CRm = 0
 151#define Op1(_x)         .Op1 = _x
 152#define Op2(_x)         .Op2 = _x
 153#define is64            .is_64bit = true
 154#define is32            .is_64bit = false
 155
 156bool access_vm_reg(struct kvm_vcpu *vcpu,
 157                   const struct coproc_params *p,
 158                   const struct coproc_reg *r);
 159
 160#endif /* __ARM_KVM_COPROC_LOCAL_H__ */
 161