2 * i386 helpers (without register variable usage)
4 * Copyright (c) 2003 Fabrice Bellard
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
34 CPUX86State *cpu_x86_init(void)
42 env = malloc(sizeof(CPUX86State));
45 memset(env, 0, sizeof(CPUX86State));
47 /* init to reset state */
51 env->hflags |= HF_SOFTMMU_MASK;
54 cpu_x86_update_cr0(env, 0x60000010);
55 env->a20_mask = 0xffffffff;
57 env->idt.limit = 0xffff;
58 env->gdt.limit = 0xffff;
59 env->ldt.limit = 0xffff;
60 env->ldt.flags = DESC_P_MASK;
61 env->tr.limit = 0xffff;
62 env->tr.flags = DESC_P_MASK;
64 /* not correct (CS base=0xffff0000) */
65 cpu_x86_load_seg_cache(env, R_CS, 0xf000, (uint8_t *)0x000f0000, 0xffff, 0);
66 cpu_x86_load_seg_cache(env, R_DS, 0, NULL, 0xffff, 0);
67 cpu_x86_load_seg_cache(env, R_ES, 0, NULL, 0xffff, 0);
68 cpu_x86_load_seg_cache(env, R_SS, 0, NULL, 0xffff, 0);
69 cpu_x86_load_seg_cache(env, R_FS, 0, NULL, 0xffff, 0);
70 cpu_x86_load_seg_cache(env, R_GS, 0, NULL, 0xffff, 0);
73 env->regs[R_EDX] = 0x600; /* indicate P6 processor */
82 /* init various static tables */
85 optimize_flags_init();
90 void cpu_x86_close(CPUX86State *env)
95 /***********************************************************/
98 static const char *cc_op_str[] = {
133 void cpu_x86_dump_state(CPUX86State *env, FILE *f, int flags)
137 static const char *seg_name[6] = { "ES", "CS", "SS", "DS", "FS", "GS" };
139 eflags = env->eflags;
140 fprintf(f, "EAX=%08x EBX=%08x ECX=%08x EDX=%08x\n"
141 "ESI=%08x EDI=%08x EBP=%08x ESP=%08x\n"
142 "EIP=%08x EFL=%08x [%c%c%c%c%c%c%c] CPL=%d II=%d\n",
143 env->regs[R_EAX], env->regs[R_EBX], env->regs[R_ECX], env->regs[R_EDX],
144 env->regs[R_ESI], env->regs[R_EDI], env->regs[R_EBP], env->regs[R_ESP],
146 eflags & DF_MASK ? 'D' : '-',
147 eflags & CC_O ? 'O' : '-',
148 eflags & CC_S ? 'S' : '-',
149 eflags & CC_Z ? 'Z' : '-',
150 eflags & CC_A ? 'A' : '-',
151 eflags & CC_P ? 'P' : '-',
152 eflags & CC_C ? 'C' : '-',
153 env->hflags & HF_CPL_MASK,
154 (env->hflags >> HF_INHIBIT_IRQ_SHIFT) & 1);
155 for(i = 0; i < 6; i++) {
156 SegmentCache *sc = &env->segs[i];
157 fprintf(f, "%s =%04x %08x %08x %08x\n",
164 fprintf(f, "LDT=%04x %08x %08x %08x\n",
169 fprintf(f, "TR =%04x %08x %08x %08x\n",
174 fprintf(f, "GDT= %08x %08x\n",
175 (int)env->gdt.base, env->gdt.limit);
176 fprintf(f, "IDT= %08x %08x\n",
177 (int)env->idt.base, env->idt.limit);
178 fprintf(f, "CR0=%08x CR2=%08x CR3=%08x CR4=%08x\n",
179 env->cr[0], env->cr[2], env->cr[3], env->cr[4]);
181 if (flags & X86_DUMP_CCOP) {
182 if ((unsigned)env->cc_op < CC_OP_NB)
183 strcpy(cc_op_name, cc_op_str[env->cc_op]);
185 snprintf(cc_op_name, sizeof(cc_op_name), "[%d]", env->cc_op);
186 fprintf(f, "CCS=%08x CCD=%08x CCO=%-8s\n",
187 env->cc_src, env->cc_dst, cc_op_name);
189 if (flags & X86_DUMP_FPU) {
190 fprintf(f, "ST0=%f ST1=%f ST2=%f ST3=%f\n",
191 (double)env->fpregs[0],
192 (double)env->fpregs[1],
193 (double)env->fpregs[2],
194 (double)env->fpregs[3]);
195 fprintf(f, "ST4=%f ST5=%f ST6=%f ST7=%f\n",
196 (double)env->fpregs[4],
197 (double)env->fpregs[5],
198 (double)env->fpregs[7],
199 (double)env->fpregs[8]);
203 /***********************************************************/
205 /* XXX: add PGE support */
207 void cpu_x86_set_a20(CPUX86State *env, int a20_state)
209 a20_state = (a20_state != 0);
210 if (a20_state != ((env->a20_mask >> 20) & 1)) {
211 #if defined(DEBUG_MMU)
212 printf("A20 update: a20=%d\n", a20_state);
214 /* if the cpu is currently executing code, we must unlink it and
215 all the potentially executing TB */
216 cpu_interrupt(env, 0);
218 /* when a20 is changed, all the MMU mappings are invalid, so
219 we must flush everything */
221 env->a20_mask = 0xffefffff | (a20_state << 20);
225 void cpu_x86_update_cr0(CPUX86State *env, uint32_t new_cr0)
229 #if defined(DEBUG_MMU)
230 printf("CR0 update: CR0=0x%08x\n", new_cr0);
232 if ((new_cr0 & (CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK)) !=
233 (env->cr[0] & (CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK))) {
236 env->cr[0] = new_cr0;
238 /* update PE flag in hidden flags */
239 pe_state = (env->cr[0] & CR0_PE_MASK);
240 env->hflags = (env->hflags & ~HF_PE_MASK) | (pe_state << HF_PE_SHIFT);
241 /* ensure that ADDSEG is always set in real mode */
242 env->hflags |= ((pe_state ^ 1) << HF_ADDSEG_SHIFT);
245 void cpu_x86_update_cr3(CPUX86State *env, uint32_t new_cr3)
247 env->cr[3] = new_cr3;
248 if (env->cr[0] & CR0_PG_MASK) {
249 #if defined(DEBUG_MMU)
250 printf("CR3 update: CR3=%08x\n", new_cr3);
256 void cpu_x86_update_cr4(CPUX86State *env, uint32_t new_cr4)
258 #if defined(DEBUG_MMU)
259 printf("CR4 update: CR4=%08x\n", env->cr[4]);
261 if ((new_cr4 & (CR4_PGE_MASK | CR4_PAE_MASK | CR4_PSE_MASK)) !=
262 (env->cr[4] & (CR4_PGE_MASK | CR4_PAE_MASK | CR4_PSE_MASK))) {
265 env->cr[4] = new_cr4;
268 /* XXX: also flush 4MB pages */
269 void cpu_x86_flush_tlb(CPUX86State *env, uint32_t addr)
271 tlb_flush_page(env, addr);
275 -1 = cannot handle fault
276 0 = nothing more to do
277 1 = generate PF fault
278 2 = soft MMU activation required for this block
280 int cpu_x86_handle_mmu_fault(CPUX86State *env, uint32_t addr,
281 int is_write, int is_user, int is_softmmu)
283 uint8_t *pde_ptr, *pte_ptr;
284 uint32_t pde, pte, virt_addr, ptep;
285 int error_code, is_dirty, prot, page_size, ret;
286 unsigned long paddr, vaddr, page_offset;
288 #if defined(DEBUG_MMU)
289 printf("MMU fault: addr=0x%08x w=%d u=%d eip=%08x\n",
290 addr, is_write, is_user, env->eip);
293 if (env->user_mode_only) {
294 /* user mode only emulation */
299 if (!(env->cr[0] & CR0_PG_MASK)) {
301 virt_addr = addr & TARGET_PAGE_MASK;
302 prot = PROT_READ | PROT_WRITE;
307 /* page directory entry */
308 pde_ptr = phys_ram_base +
309 (((env->cr[3] & ~0xfff) + ((addr >> 20) & ~3)) & env->a20_mask);
310 pde = ldl_raw(pde_ptr);
311 if (!(pde & PG_PRESENT_MASK)) {
315 /* if PSE bit is set, then we use a 4MB page */
316 if ((pde & PG_PSE_MASK) && (env->cr[4] & CR4_PSE_MASK)) {
318 if (!(pde & PG_USER_MASK))
319 goto do_fault_protect;
320 if (is_write && !(pde & PG_RW_MASK))
321 goto do_fault_protect;
323 if ((env->cr[0] & CR0_WP_MASK) && (pde & PG_USER_MASK) &&
324 is_write && !(pde & PG_RW_MASK))
325 goto do_fault_protect;
327 is_dirty = is_write && !(pde & PG_DIRTY_MASK);
328 if (!(pde & PG_ACCESSED_MASK) || is_dirty) {
329 pde |= PG_ACCESSED_MASK;
331 pde |= PG_DIRTY_MASK;
332 stl_raw(pde_ptr, pde);
335 pte = pde & ~0x003ff000; /* align to 4MB */
337 page_size = 4096 * 1024;
338 virt_addr = addr & ~0x003fffff;
340 if (!(pde & PG_ACCESSED_MASK)) {
341 pde |= PG_ACCESSED_MASK;
342 stl_raw(pde_ptr, pde);
345 /* page directory entry */
346 pte_ptr = phys_ram_base +
347 (((pde & ~0xfff) + ((addr >> 10) & 0xffc)) & env->a20_mask);
348 pte = ldl_raw(pte_ptr);
349 if (!(pte & PG_PRESENT_MASK)) {
353 /* combine pde and pte user and rw protections */
356 if (!(ptep & PG_USER_MASK))
357 goto do_fault_protect;
358 if (is_write && !(ptep & PG_RW_MASK))
359 goto do_fault_protect;
361 if ((env->cr[0] & CR0_WP_MASK) && (ptep & PG_USER_MASK) &&
362 is_write && !(ptep & PG_RW_MASK))
363 goto do_fault_protect;
365 is_dirty = is_write && !(pte & PG_DIRTY_MASK);
366 if (!(pte & PG_ACCESSED_MASK) || is_dirty) {
367 pte |= PG_ACCESSED_MASK;
369 pte |= PG_DIRTY_MASK;
370 stl_raw(pte_ptr, pte);
373 virt_addr = addr & ~0xfff;
376 /* the page can be put in the TLB */
378 if (pte & PG_DIRTY_MASK) {
379 /* only set write access if already dirty... otherwise wait
382 if (ptep & PG_RW_MASK)
385 if (!(env->cr[0] & CR0_WP_MASK) || !(ptep & PG_USER_MASK) ||
392 pte = pte & env->a20_mask;
394 /* Even if 4MB pages, we map only one 4KB page in the cache to
395 avoid filling it too fast */
396 page_offset = (addr & TARGET_PAGE_MASK) & (page_size - 1);
397 paddr = (pte & TARGET_PAGE_MASK) + page_offset;
398 vaddr = virt_addr + page_offset;
400 ret = tlb_set_page(env, vaddr, paddr, prot, is_user, is_softmmu);
403 error_code = PG_ERROR_P_MASK;
406 env->error_code = (is_write << PG_ERROR_W_BIT) | error_code;
408 env->error_code |= PG_ERROR_U_MASK;
412 #if defined(CONFIG_USER_ONLY)
413 target_ulong cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
418 target_ulong cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
420 uint8_t *pde_ptr, *pte_ptr;
421 uint32_t pde, pte, paddr, page_offset, page_size;
423 if (!(env->cr[0] & CR0_PG_MASK)) {
427 /* page directory entry */
428 pde_ptr = phys_ram_base +
429 (((env->cr[3] & ~0xfff) + ((addr >> 20) & ~3)) & env->a20_mask);
430 pde = ldl_raw(pde_ptr);
431 if (!(pde & PG_PRESENT_MASK))
433 if ((pde & PG_PSE_MASK) && (env->cr[4] & CR4_PSE_MASK)) {
434 pte = pde & ~0x003ff000; /* align to 4MB */
435 page_size = 4096 * 1024;
437 /* page directory entry */
438 pte_ptr = phys_ram_base +
439 (((pde & ~0xfff) + ((addr >> 10) & 0xffc)) & env->a20_mask);
440 pte = ldl_raw(pte_ptr);
441 if (!(pte & PG_PRESENT_MASK))
446 pte = pte & env->a20_mask;
447 page_offset = (addr & TARGET_PAGE_MASK) & (page_size - 1);
448 paddr = (pte & TARGET_PAGE_MASK) + page_offset;