1 /*
2  *  x86 misc helpers - sysemu code
3  *
4  *  Copyright (c) 2003 Fabrice Bellard
5  *
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 2.1 of the License, or (at your option) any later version.
10  *
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.
15  *
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/>.
18  */
19 
20 #include "qemu/osdep.h"
21 #include "qemu/main-loop.h"
22 #include "cpu.h"
23 #include "exec/helper-proto.h"
24 #include "exec/cpu_ldst.h"
25 #include "exec/address-spaces.h"
26 #include "tcg/helper-tcg.h"
27 
28 void helper_outb(CPUX86State *env, uint32_t port, uint32_t data)
29 {
30     address_space_stb(&address_space_io, port, data,
31                       cpu_get_mem_attrs(env), NULL);
32 }
33 
34 target_ulong helper_inb(CPUX86State *env, uint32_t port)
35 {
36     return address_space_ldub(&address_space_io, port,
37                               cpu_get_mem_attrs(env), NULL);
38 }
39 
40 void helper_outw(CPUX86State *env, uint32_t port, uint32_t data)
41 {
42     address_space_stw(&address_space_io, port, data,
43                       cpu_get_mem_attrs(env), NULL);
44 }
45 
46 target_ulong helper_inw(CPUX86State *env, uint32_t port)
47 {
48     return address_space_lduw(&address_space_io, port,
49                               cpu_get_mem_attrs(env), NULL);
50 }
51 
52 void helper_outl(CPUX86State *env, uint32_t port, uint32_t data)
53 {
54     address_space_stl(&address_space_io, port, data,
55                       cpu_get_mem_attrs(env), NULL);
56 }
57 
58 target_ulong helper_inl(CPUX86State *env, uint32_t port)
59 {
60     return address_space_ldl(&address_space_io, port,
61                              cpu_get_mem_attrs(env), NULL);
62 }
63 
64 target_ulong helper_read_crN(CPUX86State *env, int reg)
65 {
66     target_ulong val;
67 
68     switch (reg) {
69     default:
70         val = env->cr[reg];
71         break;
72     case 8:
73         if (!(env->hflags2 & HF2_VINTR_MASK)) {
74             val = cpu_get_apic_tpr(env_archcpu(env)->apic_state);
75         } else {
76             val = env->v_tpr;
77         }
78         break;
79     }
80     return val;
81 }
82 
83 void helper_write_crN(CPUX86State *env, int reg, target_ulong t0)
84 {
85     switch (reg) {
86     case 0:
87         /*
88         * If we reach this point, the CR0 write intercept is disabled.
89         * But we could still exit if the hypervisor has requested the selective
90         * intercept for bits other than TS and MP
91         */
92         if (cpu_svm_has_intercept(env, SVM_EXIT_CR0_SEL_WRITE) &&
93             ((env->cr[0] ^ t0) & ~(CR0_TS_MASK | CR0_MP_MASK))) {
94             cpu_vmexit(env, SVM_EXIT_CR0_SEL_WRITE, 0, GETPC());
95         }
96         cpu_x86_update_cr0(env, t0);
97         break;
98     case 3:
99         if ((env->efer & MSR_EFER_LMA) &&
100                 (t0 & ((~0UL) << env_archcpu(env)->phys_bits))) {
101             cpu_vmexit(env, SVM_EXIT_ERR, 0, GETPC());
102         }
103         if (!(env->efer & MSR_EFER_LMA)) {
104             t0 &= 0xffffffffUL;
105         }
106         cpu_x86_update_cr3(env, t0);
107         break;
108     case 4:
109         if (t0 & cr4_reserved_bits(env)) {
110             cpu_vmexit(env, SVM_EXIT_ERR, 0, GETPC());
111         }
112         if (((t0 ^ env->cr[4]) & CR4_LA57_MASK) &&
113             (env->hflags & HF_CS64_MASK)) {
114             raise_exception_ra(env, EXCP0D_GPF, GETPC());
115         }
116         cpu_x86_update_cr4(env, t0);
117         break;
118     case 8:
119         if (!(env->hflags2 & HF2_VINTR_MASK)) {
120             qemu_mutex_lock_iothread();
121             cpu_set_apic_tpr(env_archcpu(env)->apic_state, t0);
122             qemu_mutex_unlock_iothread();
123         }
124         env->v_tpr = t0 & 0x0f;
125         break;
126     default:
127         env->cr[reg] = t0;
128         break;
129     }
130 }
131 
132 void helper_wrmsr(CPUX86State *env)
133 {
134     uint64_t val;
135     CPUState *cs = env_cpu(env);
136 
137     cpu_svm_check_intercept_param(env, SVM_EXIT_MSR, 1, GETPC());
138 
139     val = ((uint32_t)env->regs[R_EAX]) |
140         ((uint64_t)((uint32_t)env->regs[R_EDX]) << 32);
141 
142     switch ((uint32_t)env->regs[R_ECX]) {
143     case MSR_IA32_SYSENTER_CS:
144         env->sysenter_cs = val & 0xffff;
145         break;
146     case MSR_IA32_SYSENTER_ESP:
147         env->sysenter_esp = val;
148         break;
149     case MSR_IA32_SYSENTER_EIP:
150         env->sysenter_eip = val;
151         break;
152     case MSR_IA32_APICBASE:
153         cpu_set_apic_base(env_archcpu(env)->apic_state, val);
154         break;
155     case MSR_EFER:
156         {
157             uint64_t update_mask;
158 
159             update_mask = 0;
160             if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_SYSCALL) {
161                 update_mask |= MSR_EFER_SCE;
162             }
163             if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_LM) {
164                 update_mask |= MSR_EFER_LME;
165             }
166             if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_FFXSR) {
167                 update_mask |= MSR_EFER_FFXSR;
168             }
169             if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_NX) {
170                 update_mask |= MSR_EFER_NXE;
171             }
172             if (env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_SVM) {
173                 update_mask |= MSR_EFER_SVME;
174             }
175             if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_FFXSR) {
176                 update_mask |= MSR_EFER_FFXSR;
177             }
178             cpu_load_efer(env, (env->efer & ~update_mask) |
179                           (val & update_mask));
180         }
181         break;
182     case MSR_STAR:
183         env->star = val;
184         break;
185     case MSR_PAT:
186         env->pat = val;
187         break;
188     case MSR_IA32_PKRS:
189         if (val & 0xFFFFFFFF00000000ull) {
190             goto error;
191         }
192         env->pkrs = val;
193         tlb_flush(cs);
194         break;
195     case MSR_VM_HSAVE_PA:
196         env->vm_hsave = val;
197         break;
198 #ifdef TARGET_X86_64
199     case MSR_LSTAR:
200         env->lstar = val;
201         break;
202     case MSR_CSTAR:
203         env->cstar = val;
204         break;
205     case MSR_FMASK:
206         env->fmask = val;
207         break;
208     case MSR_FSBASE:
209         env->segs[R_FS].base = val;
210         break;
211     case MSR_GSBASE:
212         env->segs[R_GS].base = val;
213         break;
214     case MSR_KERNELGSBASE:
215         env->kernelgsbase = val;
216         break;
217 #endif
218     case MSR_MTRRphysBase(0):
219     case MSR_MTRRphysBase(1):
220     case MSR_MTRRphysBase(2):
221     case MSR_MTRRphysBase(3):
222     case MSR_MTRRphysBase(4):
223     case MSR_MTRRphysBase(5):
224     case MSR_MTRRphysBase(6):
225     case MSR_MTRRphysBase(7):
226         env->mtrr_var[((uint32_t)env->regs[R_ECX] -
227                        MSR_MTRRphysBase(0)) / 2].base = val;
228         break;
229     case MSR_MTRRphysMask(0):
230     case MSR_MTRRphysMask(1):
231     case MSR_MTRRphysMask(2):
232     case MSR_MTRRphysMask(3):
233     case MSR_MTRRphysMask(4):
234     case MSR_MTRRphysMask(5):
235     case MSR_MTRRphysMask(6):
236     case MSR_MTRRphysMask(7):
237         env->mtrr_var[((uint32_t)env->regs[R_ECX] -
238                        MSR_MTRRphysMask(0)) / 2].mask = val;
239         break;
240     case MSR_MTRRfix64K_00000:
241         env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
242                         MSR_MTRRfix64K_00000] = val;
243         break;
244     case MSR_MTRRfix16K_80000:
245     case MSR_MTRRfix16K_A0000:
246         env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
247                         MSR_MTRRfix16K_80000 + 1] = val;
248         break;
249     case MSR_MTRRfix4K_C0000:
250     case MSR_MTRRfix4K_C8000:
251     case MSR_MTRRfix4K_D0000:
252     case MSR_MTRRfix4K_D8000:
253     case MSR_MTRRfix4K_E0000:
254     case MSR_MTRRfix4K_E8000:
255     case MSR_MTRRfix4K_F0000:
256     case MSR_MTRRfix4K_F8000:
257         env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
258                         MSR_MTRRfix4K_C0000 + 3] = val;
259         break;
260     case MSR_MTRRdefType:
261         env->mtrr_deftype = val;
262         break;
263     case MSR_MCG_STATUS:
264         env->mcg_status = val;
265         break;
266     case MSR_MCG_CTL:
267         if ((env->mcg_cap & MCG_CTL_P)
268             && (val == 0 || val == ~(uint64_t)0)) {
269             env->mcg_ctl = val;
270         }
271         break;
272     case MSR_TSC_AUX:
273         env->tsc_aux = val;
274         break;
275     case MSR_IA32_MISC_ENABLE:
276         env->msr_ia32_misc_enable = val;
277         break;
278     case MSR_IA32_BNDCFGS:
279         /* FIXME: #GP if reserved bits are set.  */
280         /* FIXME: Extend highest implemented bit of linear address.  */
281         env->msr_bndcfgs = val;
282         cpu_sync_bndcs_hflags(env);
283         break;
284     default:
285         if ((uint32_t)env->regs[R_ECX] >= MSR_MC0_CTL
286             && (uint32_t)env->regs[R_ECX] < MSR_MC0_CTL +
287             (4 * env->mcg_cap & 0xff)) {
288             uint32_t offset = (uint32_t)env->regs[R_ECX] - MSR_MC0_CTL;
289             if ((offset & 0x3) != 0
290                 || (val == 0 || val == ~(uint64_t)0)) {
291                 env->mce_banks[offset] = val;
292             }
293             break;
294         }
295         /* XXX: exception? */
296         break;
297     }
298     return;
299 error:
300     raise_exception_err_ra(env, EXCP0D_GPF, 0, GETPC());
301 }
302 
303 void helper_rdmsr(CPUX86State *env)
304 {
305     X86CPU *x86_cpu = env_archcpu(env);
306     uint64_t val;
307 
308     cpu_svm_check_intercept_param(env, SVM_EXIT_MSR, 0, GETPC());
309 
310     switch ((uint32_t)env->regs[R_ECX]) {
311     case MSR_IA32_SYSENTER_CS:
312         val = env->sysenter_cs;
313         break;
314     case MSR_IA32_SYSENTER_ESP:
315         val = env->sysenter_esp;
316         break;
317     case MSR_IA32_SYSENTER_EIP:
318         val = env->sysenter_eip;
319         break;
320     case MSR_IA32_APICBASE:
321         val = cpu_get_apic_base(env_archcpu(env)->apic_state);
322         break;
323     case MSR_EFER:
324         val = env->efer;
325         break;
326     case MSR_STAR:
327         val = env->star;
328         break;
329     case MSR_PAT:
330         val = env->pat;
331         break;
332     case MSR_IA32_PKRS:
333         val = env->pkrs;
334         break;
335     case MSR_VM_HSAVE_PA:
336         val = env->vm_hsave;
337         break;
338     case MSR_IA32_PERF_STATUS:
339         /* tsc_increment_by_tick */
340         val = 1000ULL;
341         /* CPU multiplier */
342         val |= (((uint64_t)4ULL) << 40);
343         break;
344 #ifdef TARGET_X86_64
345     case MSR_LSTAR:
346         val = env->lstar;
347         break;
348     case MSR_CSTAR:
349         val = env->cstar;
350         break;
351     case MSR_FMASK:
352         val = env->fmask;
353         break;
354     case MSR_FSBASE:
355         val = env->segs[R_FS].base;
356         break;
357     case MSR_GSBASE:
358         val = env->segs[R_GS].base;
359         break;
360     case MSR_KERNELGSBASE:
361         val = env->kernelgsbase;
362         break;
363     case MSR_TSC_AUX:
364         val = env->tsc_aux;
365         break;
366 #endif
367     case MSR_SMI_COUNT:
368         val = env->msr_smi_count;
369         break;
370     case MSR_MTRRphysBase(0):
371     case MSR_MTRRphysBase(1):
372     case MSR_MTRRphysBase(2):
373     case MSR_MTRRphysBase(3):
374     case MSR_MTRRphysBase(4):
375     case MSR_MTRRphysBase(5):
376     case MSR_MTRRphysBase(6):
377     case MSR_MTRRphysBase(7):
378         val = env->mtrr_var[((uint32_t)env->regs[R_ECX] -
379                              MSR_MTRRphysBase(0)) / 2].base;
380         break;
381     case MSR_MTRRphysMask(0):
382     case MSR_MTRRphysMask(1):
383     case MSR_MTRRphysMask(2):
384     case MSR_MTRRphysMask(3):
385     case MSR_MTRRphysMask(4):
386     case MSR_MTRRphysMask(5):
387     case MSR_MTRRphysMask(6):
388     case MSR_MTRRphysMask(7):
389         val = env->mtrr_var[((uint32_t)env->regs[R_ECX] -
390                              MSR_MTRRphysMask(0)) / 2].mask;
391         break;
392     case MSR_MTRRfix64K_00000:
393         val = env->mtrr_fixed[0];
394         break;
395     case MSR_MTRRfix16K_80000:
396     case MSR_MTRRfix16K_A0000:
397         val = env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
398                               MSR_MTRRfix16K_80000 + 1];
399         break;
400     case MSR_MTRRfix4K_C0000:
401     case MSR_MTRRfix4K_C8000:
402     case MSR_MTRRfix4K_D0000:
403     case MSR_MTRRfix4K_D8000:
404     case MSR_MTRRfix4K_E0000:
405     case MSR_MTRRfix4K_E8000:
406     case MSR_MTRRfix4K_F0000:
407     case MSR_MTRRfix4K_F8000:
408         val = env->mtrr_fixed[(uint32_t)env->regs[R_ECX] -
409                               MSR_MTRRfix4K_C0000 + 3];
410         break;
411     case MSR_MTRRdefType:
412         val = env->mtrr_deftype;
413         break;
414     case MSR_MTRRcap:
415         if (env->features[FEAT_1_EDX] & CPUID_MTRR) {
416             val = MSR_MTRRcap_VCNT | MSR_MTRRcap_FIXRANGE_SUPPORT |
417                 MSR_MTRRcap_WC_SUPPORTED;
418         } else {
419             /* XXX: exception? */
420             val = 0;
421         }
422         break;
423     case MSR_MCG_CAP:
424         val = env->mcg_cap;
425         break;
426     case MSR_MCG_CTL:
427         if (env->mcg_cap & MCG_CTL_P) {
428             val = env->mcg_ctl;
429         } else {
430             val = 0;
431         }
432         break;
433     case MSR_MCG_STATUS:
434         val = env->mcg_status;
435         break;
436     case MSR_IA32_MISC_ENABLE:
437         val = env->msr_ia32_misc_enable;
438         break;
439     case MSR_IA32_BNDCFGS:
440         val = env->msr_bndcfgs;
441         break;
442      case MSR_IA32_UCODE_REV:
443         val = x86_cpu->ucode_rev;
444         break;
445     default:
446         if ((uint32_t)env->regs[R_ECX] >= MSR_MC0_CTL
447             && (uint32_t)env->regs[R_ECX] < MSR_MC0_CTL +
448             (4 * env->mcg_cap & 0xff)) {
449             uint32_t offset = (uint32_t)env->regs[R_ECX] - MSR_MC0_CTL;
450             val = env->mce_banks[offset];
451             break;
452         }
453         /* XXX: exception? */
454         val = 0;
455         break;
456     }
457     env->regs[R_EAX] = (uint32_t)(val);
458     env->regs[R_EDX] = (uint32_t)(val >> 32);
459 }
460 
461 void helper_flush_page(CPUX86State *env, target_ulong addr)
462 {
463     tlb_flush_page(env_cpu(env), addr);
464 }
465 
466 static void QEMU_NORETURN do_hlt(CPUX86State *env)
467 {
468     CPUState *cs = env_cpu(env);
469 
470     env->hflags &= ~HF_INHIBIT_IRQ_MASK; /* needed if sti is just before */
471     cs->halted = 1;
472     cs->exception_index = EXCP_HLT;
473     cpu_loop_exit(cs);
474 }
475 
476 void QEMU_NORETURN helper_hlt(CPUX86State *env, int next_eip_addend)
477 {
478     cpu_svm_check_intercept_param(env, SVM_EXIT_HLT, 0, GETPC());
479     env->eip += next_eip_addend;
480 
481     do_hlt(env);
482 }
483 
484 void helper_monitor(CPUX86State *env, target_ulong ptr)
485 {
486     if ((uint32_t)env->regs[R_ECX] != 0) {
487         raise_exception_ra(env, EXCP0D_GPF, GETPC());
488     }
489     /* XXX: store address? */
490     cpu_svm_check_intercept_param(env, SVM_EXIT_MONITOR, 0, GETPC());
491 }
492 
493 void QEMU_NORETURN helper_mwait(CPUX86State *env, int next_eip_addend)
494 {
495     CPUState *cs = env_cpu(env);
496 
497     if ((uint32_t)env->regs[R_ECX] != 0) {
498         raise_exception_ra(env, EXCP0D_GPF, GETPC());
499     }
500     cpu_svm_check_intercept_param(env, SVM_EXIT_MWAIT, 0, GETPC());
501     env->eip += next_eip_addend;
502 
503     /* XXX: not complete but not completely erroneous */
504     if (cs->cpu_index != 0 || CPU_NEXT(cs) != NULL) {
505         do_pause(env);
506     } else {
507         do_hlt(env);
508     }
509 }
510