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-rw-r--r--qemu/target-ppc/helper_regs.h114
1 files changed, 114 insertions, 0 deletions
diff --git a/qemu/target-ppc/helper_regs.h b/qemu/target-ppc/helper_regs.h
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+++ b/qemu/target-ppc/helper_regs.h
@@ -0,0 +1,114 @@
+/*
+ * PowerPC emulation special registers manipulation helpers for qemu.
+ *
+ * Copyright (c) 2003-2007 Jocelyn Mayer
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#if !defined(__HELPER_REGS_H__)
+#define __HELPER_REGS_H__
+
+/* Swap temporary saved registers with GPRs */
+static inline void hreg_swap_gpr_tgpr(CPUPPCState *env)
+{
+ target_ulong tmp;
+
+ tmp = env->gpr[0];
+ env->gpr[0] = env->tgpr[0];
+ env->tgpr[0] = tmp;
+ tmp = env->gpr[1];
+ env->gpr[1] = env->tgpr[1];
+ env->tgpr[1] = tmp;
+ tmp = env->gpr[2];
+ env->gpr[2] = env->tgpr[2];
+ env->tgpr[2] = tmp;
+ tmp = env->gpr[3];
+ env->gpr[3] = env->tgpr[3];
+ env->tgpr[3] = tmp;
+}
+
+static inline void hreg_compute_mem_idx(CPUPPCState *env)
+{
+ /* Precompute MMU index */
+ if (msr_pr == 0 && msr_hv != 0) {
+ env->mmu_idx = 2;
+ } else {
+ env->mmu_idx = 1 - msr_pr;
+ }
+}
+
+static inline void hreg_compute_hflags(CPUPPCState *env)
+{
+ target_ulong hflags_mask;
+
+ /* We 'forget' FE0 & FE1: we'll never generate imprecise exceptions */
+ hflags_mask = (1 << MSR_VR) | (1 << MSR_AP) | (1 << MSR_SA) |
+ (1 << MSR_PR) | (1 << MSR_FP) | (1 << MSR_SE) | (1 << MSR_BE) |
+ (1 << MSR_LE) | (1 << MSR_VSX);
+ hflags_mask |= (1ULL << MSR_CM) | (1ULL << MSR_SF) | MSR_HVB;
+ hreg_compute_mem_idx(env);
+ env->hflags = env->msr & hflags_mask;
+ /* Merge with hflags coming from other registers */
+ env->hflags |= env->hflags_nmsr;
+}
+
+static inline int hreg_store_msr(CPUPPCState *env, target_ulong value,
+ int alter_hv)
+{
+ int excp;
+#if !defined(CONFIG_USER_ONLY)
+ CPUState *cs = CPU(ppc_env_get_cpu(env));
+#endif
+
+ excp = 0;
+ value &= env->msr_mask;
+#if !defined(CONFIG_USER_ONLY)
+ if (!alter_hv) {
+ /* mtmsr cannot alter the hypervisor state */
+ value &= ~MSR_HVB;
+ value |= env->msr & MSR_HVB;
+ }
+ if (((value >> MSR_IR) & 1) != msr_ir ||
+ ((value >> MSR_DR) & 1) != msr_dr) {
+ /* Flush all tlb when changing translation mode */
+ tlb_flush(cs, 1);
+ excp = POWERPC_EXCP_NONE;
+ cs->interrupt_request |= CPU_INTERRUPT_EXITTB;
+ }
+ if (unlikely((env->flags & POWERPC_FLAG_TGPR) &&
+ ((value ^ env->msr) & (1 << MSR_TGPR)))) {
+ /* Swap temporary saved registers with GPRs */
+ hreg_swap_gpr_tgpr(env);
+ }
+ if (unlikely((value >> MSR_EP) & 1) != msr_ep) {
+ /* Change the exception prefix on PowerPC 601 */
+ env->excp_prefix = ((value >> MSR_EP) & 1) * 0xFFF00000;
+ }
+#endif
+ env->msr = value;
+ hreg_compute_hflags(env);
+#if !defined(CONFIG_USER_ONLY)
+ if (unlikely(msr_pow == 1)) {
+ if (!env->pending_interrupts && (*env->check_pow)(env)) {
+ cs->halted = 1;
+ excp = EXCP_HALTED;
+ }
+ }
+#endif
+
+ return excp;
+}
+
+#endif /* !defined(__HELPER_REGS_H__) */