1 files changed, 138 insertions, 0 deletions

diff --git a/arch/arm64/kvm/sys_regs.h b/arch/arm64/kvm/sys_regs.h
new file mode 100644
index 000000000000..d50d3722998e
--- /dev/null
+++ b/arch/arm64/kvm/sys_regs.h
@@ -0,0 +1,138 @@
+/*
+ * Copyright (C) 2012,2013 - ARM Ltd
+ * Author: Marc Zyngier <marc.zyngier@arm.com>
+ *
+ * Derived from arch/arm/kvm/coproc.h
+ * Copyright (C) 2012 - Virtual Open Systems and Columbia University
+ * Authors: Christoffer Dall <c.dall@virtualopensystems.com>
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __ARM64_KVM_SYS_REGS_LOCAL_H__
+#define __ARM64_KVM_SYS_REGS_LOCAL_H__
+
+struct sys_reg_params {
+        u8      Op0;
+        u8      Op1;
+        u8      CRn;
+        u8      CRm;
+        u8      Op2;
+        u8      Rt;
+        bool    is_write;
+};
+
+struct sys_reg_desc {
+        /* MRS/MSR instruction which accesses it. */
+        u8      Op0;
+        u8      Op1;
+        u8      CRn;
+        u8      CRm;
+        u8      Op2;
+
+        /* Trapped access from guest, if non-NULL. */
+        bool (*access)(struct kvm_vcpu *,
+                       const struct sys_reg_params *,
+                       const struct sys_reg_desc *);
+
+        /* Initialization for vcpu. */
+        void (*reset)(struct kvm_vcpu *, const struct sys_reg_desc *);
+
+        /* Index into sys_reg[], or 0 if we don't need to save it. */
+        int reg;
+
+        /* Value (usually reset value) */
+        u64 val;
+};
+
+static inline void print_sys_reg_instr(const struct sys_reg_params *p)
+{
+        /* Look, we even formatted it for you to paste into the table! */
+        kvm_pr_unimpl(" { Op0(%2u), Op1(%2u), CRn(%2u), CRm(%2u), Op2(%2u), func_%s },\n",
+                      p->Op0, p->Op1, p->CRn, p->CRm, p->Op2, p->is_write ? "write" : "read");
+}
+
+static inline bool ignore_write(struct kvm_vcpu *vcpu,
+                                const struct sys_reg_params *p)
+{
+        return true;
+}
+
+static inline bool read_zero(struct kvm_vcpu *vcpu,
+                             const struct sys_reg_params *p)
+{
+        *vcpu_reg(vcpu, p->Rt) = 0;
+        return true;
+}
+
+static inline bool write_to_read_only(struct kvm_vcpu *vcpu,
+                                      const struct sys_reg_params *params)
+{
+        kvm_debug("sys_reg write to read-only register at: %lx\n",
+                  *vcpu_pc(vcpu));
+        print_sys_reg_instr(params);
+        return false;
+}
+
+static inline bool read_from_write_only(struct kvm_vcpu *vcpu,
+                                        const struct sys_reg_params *params)
+{
+        kvm_debug("sys_reg read to write-only register at: %lx\n",
+                  *vcpu_pc(vcpu));
+        print_sys_reg_instr(params);
+        return false;
+}
+
+/* Reset functions */
+static inline void reset_unknown(struct kvm_vcpu *vcpu,
+                                 const struct sys_reg_desc *r)
+{
+        BUG_ON(!r->reg);
+        BUG_ON(r->reg >= NR_SYS_REGS);
+        vcpu_sys_reg(vcpu, r->reg) = 0x1de7ec7edbadc0deULL;
+}
+
+static inline void reset_val(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+        BUG_ON(!r->reg);
+        BUG_ON(r->reg >= NR_SYS_REGS);
+        vcpu_sys_reg(vcpu, r->reg) = r->val;
+}
+
+static inline int cmp_sys_reg(const struct sys_reg_desc *i1,
+                              const struct sys_reg_desc *i2)
+{
+        BUG_ON(i1 == i2);
+        if (!i1)
+                return 1;
+        else if (!i2)
+                return -1;
+        if (i1->Op0 != i2->Op0)
+                return i1->Op0 - i2->Op0;
+        if (i1->Op1 != i2->Op1)
+                return i1->Op1 - i2->Op1;
+        if (i1->CRn != i2->CRn)
+                return i1->CRn - i2->CRn;
+        if (i1->CRm != i2->CRm)
+                return i1->CRm - i2->CRm;
+        return i1->Op2 - i2->Op2;
+}
+
+
+#define Op0(_x)         .Op0 = _x
+#define Op1(_x)         .Op1 = _x
+#define CRn(_x)         .CRn = _x
+#define CRm(_x)         .CRm = _x
+#define Op2(_x)         .Op2 = _x
+
+#endif /* __ARM64_KVM_SYS_REGS_LOCAL_H__ */