2 * PowerPC emulation special registers manipulation helpers for qemu.
4 * Copyright (c) 2003-2007 Jocelyn Mayer
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
23 #include "qemu/main-loop.h"
24 #include "exec/exec-all.h"
26 /* Swap temporary saved registers with GPRs */
27 static inline void hreg_swap_gpr_tgpr(CPUPPCState *env)
32 env->gpr[0] = env->tgpr[0];
35 env->gpr[1] = env->tgpr[1];
38 env->gpr[2] = env->tgpr[2];
41 env->gpr[3] = env->tgpr[3];
45 static inline void hreg_compute_mem_idx(CPUPPCState *env)
47 /* This is our encoding for server processors. The architecture
48 * specifies that there is no such thing as userspace with
49 * translation off, however it appears that MacOS does it and
50 * some 32-bit CPUs support it. Weird...
52 * 0 = Guest User space virtual mode
53 * 1 = Guest Kernel space virtual mode
54 * 2 = Guest User space real mode
55 * 3 = Guest Kernel space real mode
56 * 4 = HV User space virtual mode
57 * 5 = HV Kernel space virtual mode
58 * 6 = HV User space real mode
59 * 7 = HV Kernel space real mode
61 * For BookE, we need 8 MMU modes as follow:
63 * 0 = AS 0 HV User space
64 * 1 = AS 0 HV Kernel space
65 * 2 = AS 1 HV User space
66 * 3 = AS 1 HV Kernel space
67 * 4 = AS 0 Guest User space
68 * 5 = AS 0 Guest Kernel space
69 * 6 = AS 1 Guest User space
70 * 7 = AS 1 Guest Kernel space
72 if (env->mmu_model & POWERPC_MMU_BOOKE) {
73 env->immu_idx = env->dmmu_idx = msr_pr ? 0 : 1;
74 env->immu_idx += msr_is ? 2 : 0;
75 env->dmmu_idx += msr_ds ? 2 : 0;
76 env->immu_idx += msr_gs ? 4 : 0;
77 env->dmmu_idx += msr_gs ? 4 : 0;
79 env->immu_idx = env->dmmu_idx = msr_pr ? 0 : 1;
80 env->immu_idx += msr_ir ? 0 : 2;
81 env->dmmu_idx += msr_dr ? 0 : 2;
82 env->immu_idx += msr_hv ? 4 : 0;
83 env->dmmu_idx += msr_hv ? 4 : 0;
87 static inline void hreg_compute_hflags(CPUPPCState *env)
89 target_ulong hflags_mask;
91 /* We 'forget' FE0 & FE1: we'll never generate imprecise exceptions */
92 hflags_mask = (1 << MSR_VR) | (1 << MSR_AP) | (1 << MSR_SA) |
93 (1 << MSR_PR) | (1 << MSR_FP) | (1 << MSR_SE) | (1 << MSR_BE) |
94 (1 << MSR_LE) | (1 << MSR_VSX) | (1 << MSR_IR) | (1 << MSR_DR);
95 hflags_mask |= (1ULL << MSR_CM) | (1ULL << MSR_SF) | MSR_HVB;
96 hreg_compute_mem_idx(env);
97 env->hflags = env->msr & hflags_mask;
98 /* Merge with hflags coming from other registers */
99 env->hflags |= env->hflags_nmsr;
102 static inline void cpu_interrupt_exittb(CPUState *cs)
104 if (!qemu_mutex_iothread_locked()) {
105 qemu_mutex_lock_iothread();
106 cpu_interrupt(cs, CPU_INTERRUPT_EXITTB);
107 qemu_mutex_unlock_iothread();
109 cpu_interrupt(cs, CPU_INTERRUPT_EXITTB);
113 static inline int hreg_store_msr(CPUPPCState *env, target_ulong value,
117 #if !defined(CONFIG_USER_ONLY)
118 CPUState *cs = CPU(ppc_env_get_cpu(env));
122 value &= env->msr_mask;
123 #if !defined(CONFIG_USER_ONLY)
124 /* Neither mtmsr nor guest state can alter HV */
125 if (!alter_hv || !(env->msr & MSR_HVB)) {
127 value |= env->msr & MSR_HVB;
129 if (((value >> MSR_IR) & 1) != msr_ir ||
130 ((value >> MSR_DR) & 1) != msr_dr) {
131 cpu_interrupt_exittb(cs);
133 if ((env->mmu_model & POWERPC_MMU_BOOKE) &&
134 ((value >> MSR_GS) & 1) != msr_gs) {
135 cpu_interrupt_exittb(cs);
137 if (unlikely((env->flags & POWERPC_FLAG_TGPR) &&
138 ((value ^ env->msr) & (1 << MSR_TGPR)))) {
139 /* Swap temporary saved registers with GPRs */
140 hreg_swap_gpr_tgpr(env);
142 if (unlikely((value >> MSR_EP) & 1) != msr_ep) {
143 /* Change the exception prefix on PowerPC 601 */
144 env->excp_prefix = ((value >> MSR_EP) & 1) * 0xFFF00000;
146 /* If PR=1 then EE, IR and DR must be 1
148 * Note: We only enforce this on 64-bit server processors.
150 * - 32-bit implementations supports PR=1 and EE/DR/IR=0 and MacOS
152 * - 64-bit embedded implementations do not need any operation to be
153 * performed when PR is set.
155 if ((env->insns_flags & PPC_SEGMENT_64B) && ((value >> MSR_PR) & 1)) {
156 value |= (1 << MSR_EE) | (1 << MSR_DR) | (1 << MSR_IR);
160 hreg_compute_hflags(env);
161 #if !defined(CONFIG_USER_ONLY)
162 if (unlikely(msr_pow == 1)) {
163 if (!env->pending_interrupts && (*env->check_pow)(env)) {
173 #if !defined(CONFIG_USER_ONLY)
174 static inline void check_tlb_flush(CPUPPCState *env, bool global)
176 CPUState *cs = CPU(ppc_env_get_cpu(env));
177 if (env->tlb_need_flush & TLB_NEED_LOCAL_FLUSH) {
179 env->tlb_need_flush &= ~TLB_NEED_LOCAL_FLUSH;
182 /* Propagate TLB invalidations to other CPUs when the guest uses broadcast
183 * TLB invalidation instructions.
185 if (global && (env->tlb_need_flush & TLB_NEED_GLOBAL_FLUSH)) {
187 CPU_FOREACH(other_cs) {
188 if (other_cs != cs) {
189 PowerPCCPU *cpu = POWERPC_CPU(other_cs);
190 CPUPPCState *other_env = &cpu->env;
192 other_env->tlb_need_flush &= ~TLB_NEED_LOCAL_FLUSH;
196 env->tlb_need_flush &= ~TLB_NEED_GLOBAL_FLUSH;
200 static inline void check_tlb_flush(CPUPPCState *env, bool global) { }
203 #endif /* HELPER_REGS_H */