static void x86_cpu_reset(CPUState *s) { X86CPU *cpu = X86_CPU(s); X86CPUClass *xcc = X86_CPU_GET_CLASS(cpu); CPUX86State *env = &cpu->env; target_ulong cr4; uint64_t xcr0; int i; xcc->parent_reset(s); memset(env, 0, offsetof(CPUX86State, end_reset_fields)); tlb_flush(s, 1); env->old_exception = -1; /* init to reset state */ env->hflags2 |= HF2_GIF_MASK; cpu_x86_update_cr0(env, 0x60000010); env->a20_mask = ~0x0; env->smbase = 0x30000; env->idt.limit = 0xffff; env->gdt.limit = 0xffff; env->ldt.limit = 0xffff; env->ldt.flags = DESC_P_MASK | (2 << DESC_TYPE_SHIFT); env->tr.limit = 0xffff; env->tr.flags = DESC_P_MASK | (11 << DESC_TYPE_SHIFT); cpu_x86_load_seg_cache(env, R_CS, 0xf000, 0xffff0000, 0xffff, DESC_P_MASK | DESC_S_MASK | DESC_CS_MASK | DESC_R_MASK | DESC_A_MASK); cpu_x86_load_seg_cache(env, R_DS, 0, 0, 0xffff, DESC_P_MASK | DESC_S_MASK | DESC_W_MASK | DESC_A_MASK); cpu_x86_load_seg_cache(env, R_ES, 0, 0, 0xffff, DESC_P_MASK | DESC_S_MASK | DESC_W_MASK | DESC_A_MASK); cpu_x86_load_seg_cache(env, R_SS, 0, 0, 0xffff, DESC_P_MASK | DESC_S_MASK | DESC_W_MASK | DESC_A_MASK); cpu_x86_load_seg_cache(env, R_FS, 0, 0, 0xffff, DESC_P_MASK | DESC_S_MASK | DESC_W_MASK | DESC_A_MASK); cpu_x86_load_seg_cache(env, R_GS, 0, 0, 0xffff, DESC_P_MASK | DESC_S_MASK | DESC_W_MASK | DESC_A_MASK); env->eip = 0xfff0; env->regs[R_EDX] = env->cpuid_version; env->eflags = 0x2; /* FPU init */ for (i = 0; i < 8; i++) { env->fptags[i] = 1; } cpu_set_fpuc(env, 0x37f); env->mxcsr = 0x1f80; /* All units are in INIT state. */ env->xstate_bv = 0; env->pat = 0x0007040600070406ULL; env->msr_ia32_misc_enable = MSR_IA32_MISC_ENABLE_DEFAULT; memset(env->dr, 0, sizeof(env->dr)); env->dr[6] = DR6_FIXED_1; env->dr[7] = DR7_FIXED_1; cpu_breakpoint_remove_all(s, BP_CPU); cpu_watchpoint_remove_all(s, BP_CPU); cr4 = 0; xcr0 = XSTATE_FP_MASK; #ifdef CONFIG_USER_ONLY /* Enable all the features for user-mode. */ if (env->features[FEAT_1_EDX] & CPUID_SSE) { xcr0 |= XSTATE_SSE_MASK; } for (i = 2; i < ARRAY_SIZE(x86_ext_save_areas); i++) { const ExtSaveArea *esa = &x86_ext_save_areas[i]; if ((env->features[esa->feature] & esa->bits) == esa->bits) { xcr0 |= 1ull << i; } } if (env->features[FEAT_1_ECX] & CPUID_EXT_XSAVE) { cr4 |= CR4_OSFXSR_MASK | CR4_OSXSAVE_MASK; } if (env->features[FEAT_7_0_EBX] & CPUID_7_0_EBX_FSGSBASE) { cr4 |= CR4_FSGSBASE_MASK; } #endif env->xcr0 = xcr0; cpu_x86_update_cr4(env, cr4); /* * SDM 11.11.5 requires: * - IA32_MTRR_DEF_TYPE MSR.E = 0 * - IA32_MTRR_PHYSMASKn.V = 0 * All other bits are undefined. For simplification, zero it all. */ env->mtrr_deftype = 0; memset(env->mtrr_var, 0, sizeof(env->mtrr_var)); memset(env->mtrr_fixed, 0, sizeof(env->mtrr_fixed)); #if !defined(CONFIG_USER_ONLY) /* We hard-wire the BSP to the first CPU. */ apic_designate_bsp(cpu->apic_state, s->cpu_index == 0); s->halted = !cpu_is_bsp(cpu); if (kvm_enabled()) { kvm_arch_reset_vcpu(cpu); } #endif }