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/*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA
*/
#if !defined(__HELPER_REGS_H__)
#define __HELPER_REGS_H__
/* Swap temporary saved registers with GPRs */
static always_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 always_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 always_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);
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 always_inline int hreg_store_msr (CPUPPCState *env, target_ulong value,
int alter_hv)
{
int excp;
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(env, 1);
excp = POWERPC_EXCP_NONE;
env->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->check_pow)(env)) {
env->halted = 1;
excp = EXCP_HALTED;
}
}
#endif
return excp;
}
#endif /* !defined(__HELPER_REGS_H__) */
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