[MIPS] Import MIPS target support
From v0.12.5 tag at git://git.sv.gnu.org/qemu.git
CommitID: 174f225e9d62e8f3002e274e4f718bd2a967fbf4
Change-Id: I35b49a4319cee4b69cf9da4e5af1f43327e21056
Signed-off-by: Chris Dearman <[email protected]>
diff --git a/target-mips/helper.c b/target-mips/helper.c
new file mode 100644
index 0000000..ec87114
--- /dev/null
+++ b/target-mips/helper.c
@@ -0,0 +1,647 @@
+/*
+ * MIPS emulation helpers for qemu.
+ *
+ * Copyright (c) 2004-2005 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, see <http://www.gnu.org/licenses/>.
+ */
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include <signal.h>
+
+#include "cpu.h"
+#include "exec-all.h"
+
+enum {
+ TLBRET_DIRTY = -4,
+ TLBRET_INVALID = -3,
+ TLBRET_NOMATCH = -2,
+ TLBRET_BADADDR = -1,
+ TLBRET_MATCH = 0
+};
+
+/* no MMU emulation */
+int no_mmu_map_address (CPUState *env, target_phys_addr_t *physical, int *prot,
+ target_ulong address, int rw, int access_type)
+{
+ *physical = address;
+ *prot = PAGE_READ | PAGE_WRITE;
+ return TLBRET_MATCH;
+}
+
+/* fixed mapping MMU emulation */
+int fixed_mmu_map_address (CPUState *env, target_phys_addr_t *physical, int *prot,
+ target_ulong address, int rw, int access_type)
+{
+ if (address <= (int32_t)0x7FFFFFFFUL) {
+ if (!(env->CP0_Status & (1 << CP0St_ERL)))
+ *physical = address + 0x40000000UL;
+ else
+ *physical = address;
+ } else if (address <= (int32_t)0xBFFFFFFFUL)
+ *physical = address & 0x1FFFFFFF;
+ else
+ *physical = address;
+
+ *prot = PAGE_READ | PAGE_WRITE;
+ return TLBRET_MATCH;
+}
+
+/* MIPS32/MIPS64 R4000-style MMU emulation */
+int r4k_map_address (CPUState *env, target_phys_addr_t *physical, int *prot,
+ target_ulong address, int rw, int access_type)
+{
+ uint8_t ASID = env->CP0_EntryHi & 0xFF;
+ int i;
+
+ for (i = 0; i < env->tlb->tlb_in_use; i++) {
+ r4k_tlb_t *tlb = &env->tlb->mmu.r4k.tlb[i];
+ /* 1k pages are not supported. */
+ target_ulong mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1);
+ target_ulong tag = address & ~mask;
+ target_ulong VPN = tlb->VPN & ~mask;
+#if defined(TARGET_MIPS64)
+ tag &= env->SEGMask;
+#endif
+
+ /* Check ASID, virtual page number & size */
+ if ((tlb->G == 1 || tlb->ASID == ASID) && VPN == tag) {
+ /* TLB match */
+ int n = !!(address & mask & ~(mask >> 1));
+ /* Check access rights */
+ if (!(n ? tlb->V1 : tlb->V0))
+ return TLBRET_INVALID;
+ if (rw == 0 || (n ? tlb->D1 : tlb->D0)) {
+ *physical = tlb->PFN[n] | (address & (mask >> 1));
+ *prot = PAGE_READ;
+ if (n ? tlb->D1 : tlb->D0)
+ *prot |= PAGE_WRITE;
+ return TLBRET_MATCH;
+ }
+ return TLBRET_DIRTY;
+ }
+ }
+ return TLBRET_NOMATCH;
+}
+
+#if !defined(CONFIG_USER_ONLY)
+static int get_physical_address (CPUState *env, target_phys_addr_t *physical,
+ int *prot, target_ulong address,
+ int rw, int access_type)
+{
+ /* User mode can only access useg/xuseg */
+ int user_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_UM;
+ int supervisor_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_SM;
+ int kernel_mode = !user_mode && !supervisor_mode;
+#if defined(TARGET_MIPS64)
+ int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
+ int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
+ int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
+#endif
+ int ret = TLBRET_MATCH;
+
+#if 0
+ qemu_log("user mode %d h %08x\n", user_mode, env->hflags);
+#endif
+
+ if (address <= (int32_t)0x7FFFFFFFUL) {
+ /* useg */
+ if (env->CP0_Status & (1 << CP0St_ERL)) {
+ *physical = address & 0xFFFFFFFF;
+ *prot = PAGE_READ | PAGE_WRITE;
+ } else {
+ ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
+ }
+#if defined(TARGET_MIPS64)
+ } else if (address < 0x4000000000000000ULL) {
+ /* xuseg */
+ if (UX && address <= (0x3FFFFFFFFFFFFFFFULL & env->SEGMask)) {
+ ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
+ } else {
+ ret = TLBRET_BADADDR;
+ }
+ } else if (address < 0x8000000000000000ULL) {
+ /* xsseg */
+ if ((supervisor_mode || kernel_mode) &&
+ SX && address <= (0x7FFFFFFFFFFFFFFFULL & env->SEGMask)) {
+ ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
+ } else {
+ ret = TLBRET_BADADDR;
+ }
+ } else if (address < 0xC000000000000000ULL) {
+ /* xkphys */
+ if (kernel_mode && KX &&
+ (address & 0x07FFFFFFFFFFFFFFULL) <= env->PAMask) {
+ *physical = address & env->PAMask;
+ *prot = PAGE_READ | PAGE_WRITE;
+ } else {
+ ret = TLBRET_BADADDR;
+ }
+ } else if (address < 0xFFFFFFFF80000000ULL) {
+ /* xkseg */
+ if (kernel_mode && KX &&
+ address <= (0xFFFFFFFF7FFFFFFFULL & env->SEGMask)) {
+ ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
+ } else {
+ ret = TLBRET_BADADDR;
+ }
+#endif
+ } else if (address < (int32_t)0xA0000000UL) {
+ /* kseg0 */
+ if (kernel_mode) {
+ *physical = address - (int32_t)0x80000000UL;
+ *prot = PAGE_READ | PAGE_WRITE;
+ } else {
+ ret = TLBRET_BADADDR;
+ }
+ } else if (address < (int32_t)0xC0000000UL) {
+ /* kseg1 */
+ if (kernel_mode) {
+ *physical = address - (int32_t)0xA0000000UL;
+ *prot = PAGE_READ | PAGE_WRITE;
+ } else {
+ ret = TLBRET_BADADDR;
+ }
+ } else if (address < (int32_t)0xE0000000UL) {
+ /* sseg (kseg2) */
+ if (supervisor_mode || kernel_mode) {
+ ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
+ } else {
+ ret = TLBRET_BADADDR;
+ }
+ } else {
+ /* kseg3 */
+ /* XXX: debug segment is not emulated */
+ if (kernel_mode) {
+ ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
+ } else {
+ ret = TLBRET_BADADDR;
+ }
+ }
+#if 0
+ qemu_log(TARGET_FMT_lx " %d %d => " TARGET_FMT_lx " %d (%d)\n",
+ address, rw, access_type, *physical, *prot, ret);
+#endif
+
+ return ret;
+}
+#endif
+
+static void raise_mmu_exception(CPUState *env, target_ulong address,
+ int rw, int tlb_error)
+{
+ int exception = 0, error_code = 0;
+
+ switch (tlb_error) {
+ default:
+ case TLBRET_BADADDR:
+ /* Reference to kernel address from user mode or supervisor mode */
+ /* Reference to supervisor address from user mode */
+ if (rw)
+ exception = EXCP_AdES;
+ else
+ exception = EXCP_AdEL;
+ break;
+ case TLBRET_NOMATCH:
+ /* No TLB match for a mapped address */
+ if (rw)
+ exception = EXCP_TLBS;
+ else
+ exception = EXCP_TLBL;
+ error_code = 1;
+ break;
+ case TLBRET_INVALID:
+ /* TLB match with no valid bit */
+ if (rw)
+ exception = EXCP_TLBS;
+ else
+ exception = EXCP_TLBL;
+ break;
+ case TLBRET_DIRTY:
+ /* TLB match but 'D' bit is cleared */
+ exception = EXCP_LTLBL;
+ break;
+
+ }
+ /* Raise exception */
+ env->CP0_BadVAddr = address;
+ env->CP0_Context = (env->CP0_Context & ~0x007fffff) |
+ ((address >> 9) & 0x007ffff0);
+ env->CP0_EntryHi =
+ (env->CP0_EntryHi & 0xFF) | (address & (TARGET_PAGE_MASK << 1));
+#if defined(TARGET_MIPS64)
+ env->CP0_EntryHi &= env->SEGMask;
+ env->CP0_XContext = (env->CP0_XContext & ((~0ULL) << (env->SEGBITS - 7))) |
+ ((address & 0xC00000000000ULL) >> (55 - env->SEGBITS)) |
+ ((address & ((1ULL << env->SEGBITS) - 1) & 0xFFFFFFFFFFFFE000ULL) >> 9);
+#endif
+ env->exception_index = exception;
+ env->error_code = error_code;
+}
+
+target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr)
+{
+#if defined(CONFIG_USER_ONLY)
+ return addr;
+#else
+ target_phys_addr_t phys_addr;
+ int prot;
+
+ if (get_physical_address(env, &phys_addr, &prot, addr, 0, ACCESS_INT) != 0)
+ return -1;
+ return phys_addr;
+#endif
+}
+
+int cpu_mips_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
+ int mmu_idx, int is_softmmu)
+{
+#if !defined(CONFIG_USER_ONLY)
+ target_phys_addr_t physical;
+ int prot;
+#endif
+ int access_type;
+ int ret = 0;
+
+#if 0
+ log_cpu_state(env, 0);
+#endif
+ qemu_log("%s pc " TARGET_FMT_lx " ad " TARGET_FMT_lx " rw %d mmu_idx %d smmu %d\n",
+ __func__, env->active_tc.PC, address, rw, mmu_idx, is_softmmu);
+
+ rw &= 1;
+
+ /* data access */
+ /* XXX: put correct access by using cpu_restore_state()
+ correctly */
+ access_type = ACCESS_INT;
+#if defined(CONFIG_USER_ONLY)
+ ret = TLBRET_NOMATCH;
+#else
+ ret = get_physical_address(env, &physical, &prot,
+ address, rw, access_type);
+ qemu_log("%s address=" TARGET_FMT_lx " ret %d physical " TARGET_FMT_plx " prot %d\n",
+ __func__, address, ret, physical, prot);
+ if (ret == TLBRET_MATCH) {
+ ret = tlb_set_page(env, address & TARGET_PAGE_MASK,
+ physical & TARGET_PAGE_MASK, prot,
+ mmu_idx, is_softmmu);
+ } else if (ret < 0)
+#endif
+ {
+ raise_mmu_exception(env, address, rw, ret);
+ ret = 1;
+ }
+
+ return ret;
+}
+
+#if !defined(CONFIG_USER_ONLY)
+target_phys_addr_t cpu_mips_translate_address(CPUState *env, target_ulong address, int rw)
+{
+ target_phys_addr_t physical;
+ int prot;
+ int access_type;
+ int ret = 0;
+
+ rw &= 1;
+
+ /* data access */
+ access_type = ACCESS_INT;
+ ret = get_physical_address(env, &physical, &prot,
+ address, rw, access_type);
+ if (ret != TLBRET_MATCH) {
+ raise_mmu_exception(env, address, rw, ret);
+ return -1LL;
+ } else {
+ return physical;
+ }
+}
+#endif
+
+static const char * const excp_names[EXCP_LAST + 1] = {
+ [EXCP_RESET] = "reset",
+ [EXCP_SRESET] = "soft reset",
+ [EXCP_DSS] = "debug single step",
+ [EXCP_DINT] = "debug interrupt",
+ [EXCP_NMI] = "non-maskable interrupt",
+ [EXCP_MCHECK] = "machine check",
+ [EXCP_EXT_INTERRUPT] = "interrupt",
+ [EXCP_DFWATCH] = "deferred watchpoint",
+ [EXCP_DIB] = "debug instruction breakpoint",
+ [EXCP_IWATCH] = "instruction fetch watchpoint",
+ [EXCP_AdEL] = "address error load",
+ [EXCP_AdES] = "address error store",
+ [EXCP_TLBF] = "TLB refill",
+ [EXCP_IBE] = "instruction bus error",
+ [EXCP_DBp] = "debug breakpoint",
+ [EXCP_SYSCALL] = "syscall",
+ [EXCP_BREAK] = "break",
+ [EXCP_CpU] = "coprocessor unusable",
+ [EXCP_RI] = "reserved instruction",
+ [EXCP_OVERFLOW] = "arithmetic overflow",
+ [EXCP_TRAP] = "trap",
+ [EXCP_FPE] = "floating point",
+ [EXCP_DDBS] = "debug data break store",
+ [EXCP_DWATCH] = "data watchpoint",
+ [EXCP_LTLBL] = "TLB modify",
+ [EXCP_TLBL] = "TLB load",
+ [EXCP_TLBS] = "TLB store",
+ [EXCP_DBE] = "data bus error",
+ [EXCP_DDBL] = "debug data break load",
+ [EXCP_THREAD] = "thread",
+ [EXCP_MDMX] = "MDMX",
+ [EXCP_C2E] = "precise coprocessor 2",
+ [EXCP_CACHE] = "cache error",
+};
+
+void do_interrupt (CPUState *env)
+{
+#if !defined(CONFIG_USER_ONLY)
+ target_ulong offset;
+ int cause = -1;
+ const char *name;
+
+ if (qemu_log_enabled() && env->exception_index != EXCP_EXT_INTERRUPT) {
+ if (env->exception_index < 0 || env->exception_index > EXCP_LAST)
+ name = "unknown";
+ else
+ name = excp_names[env->exception_index];
+
+ qemu_log("%s enter: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " %s exception\n",
+ __func__, env->active_tc.PC, env->CP0_EPC, name);
+ }
+ if (env->exception_index == EXCP_EXT_INTERRUPT &&
+ (env->hflags & MIPS_HFLAG_DM))
+ env->exception_index = EXCP_DINT;
+ offset = 0x180;
+ switch (env->exception_index) {
+ case EXCP_DSS:
+ env->CP0_Debug |= 1 << CP0DB_DSS;
+ /* Debug single step cannot be raised inside a delay slot and
+ resume will always occur on the next instruction
+ (but we assume the pc has always been updated during
+ code translation). */
+ env->CP0_DEPC = env->active_tc.PC;
+ goto enter_debug_mode;
+ case EXCP_DINT:
+ env->CP0_Debug |= 1 << CP0DB_DINT;
+ goto set_DEPC;
+ case EXCP_DIB:
+ env->CP0_Debug |= 1 << CP0DB_DIB;
+ goto set_DEPC;
+ case EXCP_DBp:
+ env->CP0_Debug |= 1 << CP0DB_DBp;
+ goto set_DEPC;
+ case EXCP_DDBS:
+ env->CP0_Debug |= 1 << CP0DB_DDBS;
+ goto set_DEPC;
+ case EXCP_DDBL:
+ env->CP0_Debug |= 1 << CP0DB_DDBL;
+ set_DEPC:
+ if (env->hflags & MIPS_HFLAG_BMASK) {
+ /* If the exception was raised from a delay slot,
+ come back to the jump. */
+ env->CP0_DEPC = env->active_tc.PC - 4;
+ env->hflags &= ~MIPS_HFLAG_BMASK;
+ } else {
+ env->CP0_DEPC = env->active_tc.PC;
+ }
+ enter_debug_mode:
+ env->hflags |= MIPS_HFLAG_DM | MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
+ env->hflags &= ~(MIPS_HFLAG_KSU);
+ /* EJTAG probe trap enable is not implemented... */
+ if (!(env->CP0_Status & (1 << CP0St_EXL)))
+ env->CP0_Cause &= ~(1 << CP0Ca_BD);
+ env->active_tc.PC = (int32_t)0xBFC00480;
+ break;
+ case EXCP_RESET:
+ cpu_reset(env);
+ break;
+ case EXCP_SRESET:
+ env->CP0_Status |= (1 << CP0St_SR);
+ memset(env->CP0_WatchLo, 0, sizeof(*env->CP0_WatchLo));
+ goto set_error_EPC;
+ case EXCP_NMI:
+ env->CP0_Status |= (1 << CP0St_NMI);
+ set_error_EPC:
+ if (env->hflags & MIPS_HFLAG_BMASK) {
+ /* If the exception was raised from a delay slot,
+ come back to the jump. */
+ env->CP0_ErrorEPC = env->active_tc.PC - 4;
+ env->hflags &= ~MIPS_HFLAG_BMASK;
+ } else {
+ env->CP0_ErrorEPC = env->active_tc.PC;
+ }
+ env->CP0_Status |= (1 << CP0St_ERL) | (1 << CP0St_BEV);
+ env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
+ env->hflags &= ~(MIPS_HFLAG_KSU);
+ if (!(env->CP0_Status & (1 << CP0St_EXL)))
+ env->CP0_Cause &= ~(1 << CP0Ca_BD);
+ env->active_tc.PC = (int32_t)0xBFC00000;
+ break;
+ case EXCP_EXT_INTERRUPT:
+ cause = 0;
+ if (env->CP0_Cause & (1 << CP0Ca_IV))
+ offset = 0x200;
+ goto set_EPC;
+ case EXCP_LTLBL:
+ cause = 1;
+ goto set_EPC;
+ case EXCP_TLBL:
+ cause = 2;
+ if (env->error_code == 1 && !(env->CP0_Status & (1 << CP0St_EXL))) {
+#if defined(TARGET_MIPS64)
+ int R = env->CP0_BadVAddr >> 62;
+ int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
+ int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
+ int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
+
+ if ((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX))
+ offset = 0x080;
+ else
+#endif
+ offset = 0x000;
+ }
+ goto set_EPC;
+ case EXCP_TLBS:
+ cause = 3;
+ if (env->error_code == 1 && !(env->CP0_Status & (1 << CP0St_EXL))) {
+#if defined(TARGET_MIPS64)
+ int R = env->CP0_BadVAddr >> 62;
+ int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
+ int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
+ int KX = (env->CP0_Status & (1 << CP0St_KX)) != 0;
+
+ if ((R == 0 && UX) || (R == 1 && SX) || (R == 3 && KX))
+ offset = 0x080;
+ else
+#endif
+ offset = 0x000;
+ }
+ goto set_EPC;
+ case EXCP_AdEL:
+ cause = 4;
+ goto set_EPC;
+ case EXCP_AdES:
+ cause = 5;
+ goto set_EPC;
+ case EXCP_IBE:
+ cause = 6;
+ goto set_EPC;
+ case EXCP_DBE:
+ cause = 7;
+ goto set_EPC;
+ case EXCP_SYSCALL:
+ cause = 8;
+ goto set_EPC;
+ case EXCP_BREAK:
+ cause = 9;
+ goto set_EPC;
+ case EXCP_RI:
+ cause = 10;
+ goto set_EPC;
+ case EXCP_CpU:
+ cause = 11;
+ env->CP0_Cause = (env->CP0_Cause & ~(0x3 << CP0Ca_CE)) |
+ (env->error_code << CP0Ca_CE);
+ goto set_EPC;
+ case EXCP_OVERFLOW:
+ cause = 12;
+ goto set_EPC;
+ case EXCP_TRAP:
+ cause = 13;
+ goto set_EPC;
+ case EXCP_FPE:
+ cause = 15;
+ goto set_EPC;
+ case EXCP_C2E:
+ cause = 18;
+ goto set_EPC;
+ case EXCP_MDMX:
+ cause = 22;
+ goto set_EPC;
+ case EXCP_DWATCH:
+ cause = 23;
+ /* XXX: TODO: manage defered watch exceptions */
+ goto set_EPC;
+ case EXCP_MCHECK:
+ cause = 24;
+ goto set_EPC;
+ case EXCP_THREAD:
+ cause = 25;
+ goto set_EPC;
+ case EXCP_CACHE:
+ cause = 30;
+ if (env->CP0_Status & (1 << CP0St_BEV)) {
+ offset = 0x100;
+ } else {
+ offset = 0x20000100;
+ }
+ set_EPC:
+ if (!(env->CP0_Status & (1 << CP0St_EXL))) {
+ if (env->hflags & MIPS_HFLAG_BMASK) {
+ /* If the exception was raised from a delay slot,
+ come back to the jump. */
+ env->CP0_EPC = env->active_tc.PC - 4;
+ env->CP0_Cause |= (1 << CP0Ca_BD);
+ } else {
+ env->CP0_EPC = env->active_tc.PC;
+ env->CP0_Cause &= ~(1 << CP0Ca_BD);
+ }
+ env->CP0_Status |= (1 << CP0St_EXL);
+ env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
+ env->hflags &= ~(MIPS_HFLAG_KSU);
+ }
+ env->hflags &= ~MIPS_HFLAG_BMASK;
+ if (env->CP0_Status & (1 << CP0St_BEV)) {
+ env->active_tc.PC = (int32_t)0xBFC00200;
+ } else {
+ env->active_tc.PC = (int32_t)(env->CP0_EBase & ~0x3ff);
+ }
+ env->active_tc.PC += offset;
+ env->CP0_Cause = (env->CP0_Cause & ~(0x1f << CP0Ca_EC)) | (cause << CP0Ca_EC);
+ break;
+ default:
+ qemu_log("Invalid MIPS exception %d. Exiting\n", env->exception_index);
+ printf("Invalid MIPS exception %d. Exiting\n", env->exception_index);
+ exit(1);
+ }
+ if (qemu_log_enabled() && env->exception_index != EXCP_EXT_INTERRUPT) {
+ qemu_log("%s: PC " TARGET_FMT_lx " EPC " TARGET_FMT_lx " cause %d\n"
+ " S %08x C %08x A " TARGET_FMT_lx " D " TARGET_FMT_lx "\n",
+ __func__, env->active_tc.PC, env->CP0_EPC, cause,
+ env->CP0_Status, env->CP0_Cause, env->CP0_BadVAddr,
+ env->CP0_DEPC);
+ }
+#endif
+ env->exception_index = EXCP_NONE;
+}
+
+void r4k_invalidate_tlb (CPUState *env, int idx, int use_extra)
+{
+ r4k_tlb_t *tlb;
+ target_ulong addr;
+ target_ulong end;
+ uint8_t ASID = env->CP0_EntryHi & 0xFF;
+ target_ulong mask;
+
+ tlb = &env->tlb->mmu.r4k.tlb[idx];
+ /* The qemu TLB is flushed when the ASID changes, so no need to
+ flush these entries again. */
+ if (tlb->G == 0 && tlb->ASID != ASID) {
+ return;
+ }
+
+ if (use_extra && env->tlb->tlb_in_use < MIPS_TLB_MAX) {
+ /* For tlbwr, we can shadow the discarded entry into
+ a new (fake) TLB entry, as long as the guest can not
+ tell that it's there. */
+ env->tlb->mmu.r4k.tlb[env->tlb->tlb_in_use] = *tlb;
+ env->tlb->tlb_in_use++;
+ return;
+ }
+
+ /* 1k pages are not supported. */
+ mask = tlb->PageMask | ~(TARGET_PAGE_MASK << 1);
+ if (tlb->V0) {
+ addr = tlb->VPN & ~mask;
+#if defined(TARGET_MIPS64)
+ if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) {
+ addr |= 0x3FFFFF0000000000ULL;
+ }
+#endif
+ end = addr | (mask >> 1);
+ while (addr < end) {
+ tlb_flush_page (env, addr);
+ addr += TARGET_PAGE_SIZE;
+ }
+ }
+ if (tlb->V1) {
+ addr = (tlb->VPN & ~mask) | ((mask >> 1) + 1);
+#if defined(TARGET_MIPS64)
+ if (addr >= (0xFFFFFFFF80000000ULL & env->SEGMask)) {
+ addr |= 0x3FFFFF0000000000ULL;
+ }
+#endif
+ end = addr | mask;
+ while (addr - 1 < end) {
+ tlb_flush_page (env, addr);
+ addr += TARGET_PAGE_SIZE;
+ }
+ }
+}
