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, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 #if !defined(__HELPER_REGS_H__)
22 #define __HELPER_REGS_H__
24 /* Swap temporary saved registers with GPRs */
25 static always_inline
void hreg_swap_gpr_tgpr (CPUPPCState
*env
)
30 env
->gpr
[0] = env
->tgpr
[0];
33 env
->gpr
[1] = env
->tgpr
[1];
36 env
->gpr
[2] = env
->tgpr
[2];
39 env
->gpr
[3] = env
->tgpr
[3];
43 static always_inline
void hreg_compute_mem_idx (CPUPPCState
*env
)
45 /* Precompute MMU index */
46 if (msr_pr
== 0 && msr_hv
!= 0) {
49 env
->mmu_idx
= 1 - msr_pr
;
53 static always_inline
void hreg_compute_hflags (CPUPPCState
*env
)
55 target_ulong hflags_mask
;
57 /* We 'forget' FE0 & FE1: we'll never generate imprecise exceptions */
58 hflags_mask
= (1 << MSR_VR
) | (1 << MSR_AP
) | (1 << MSR_SA
) |
59 (1 << MSR_PR
) | (1 << MSR_FP
) | (1 << MSR_SE
) | (1 << MSR_BE
) |
61 hflags_mask
|= (1ULL << MSR_CM
) | (1ULL << MSR_SF
) | MSR_HVB
;
62 hreg_compute_mem_idx(env
);
63 env
->hflags
= env
->msr
& hflags_mask
;
64 /* Merge with hflags coming from other registers */
65 env
->hflags
|= env
->hflags_nmsr
;
68 static always_inline
int hreg_store_msr (CPUPPCState
*env
, target_ulong value
,
74 value
&= env
->msr_mask
;
75 #if !defined (CONFIG_USER_ONLY)
77 /* mtmsr cannot alter the hypervisor state */
79 value
|= env
->msr
& MSR_HVB
;
81 if (((value
>> MSR_IR
) & 1) != msr_ir
||
82 ((value
>> MSR_DR
) & 1) != msr_dr
) {
83 /* Flush all tlb when changing translation mode */
85 excp
= POWERPC_EXCP_NONE
;
86 env
->interrupt_request
|= CPU_INTERRUPT_EXITTB
;
88 if (unlikely((env
->flags
& POWERPC_FLAG_TGPR
) &&
89 ((value
^ env
->msr
) & (1 << MSR_TGPR
)))) {
90 /* Swap temporary saved registers with GPRs */
91 hreg_swap_gpr_tgpr(env
);
93 if (unlikely((value
>> MSR_EP
) & 1) != msr_ep
) {
94 /* Change the exception prefix on PowerPC 601 */
95 env
->excp_prefix
= ((value
>> MSR_EP
) & 1) * 0xFFF00000;
99 hreg_compute_hflags(env
);
100 #if !defined (CONFIG_USER_ONLY)
101 if (unlikely(msr_pow
== 1)) {
102 if ((*env
->check_pow
)(env
)) {
112 #endif /* !defined(__HELPER_REGS_H__) */