target-cris/mmu.c - qemu - Git at Google

 /*
  *  CRIS mmu emulation.
  *
  *  Copyright (c) 2007 AXIS Communications AB
  *  Written by Edgar E. Iglesias.
  *
  * 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 "qemu/osdep.h"
 #include "cpu.h"
 #include "exec/exec-all.h"
 #include "mmu.h"

 #ifdef DEBUG
 #define D(x) x
 #define D_LOG(...) qemu_log(__VA_ARGS__)
 #else
 #define D(x) do { } while (0)
 #define D_LOG(...) do { } while (0)
 #endif

 void cris_mmu_init(CPUCRISState *env)
 {
 	env->mmu_rand_lfsr = 0xcccc;
 }

 #define SR_POLYNOM 0x8805
 static inline unsigned int compute_polynom(unsigned int sr)
 {
 	unsigned int i;
 	unsigned int f;

 	f = 0;
 	for (i = 0; i < 16; i++)
 		f += ((SR_POLYNOM >> i) & 1) & ((sr >> i) & 1);

 	return f;
 }

 static void cris_mmu_update_rand_lfsr(CPUCRISState *env)
 {
 	unsigned int f;

 	/* Update lfsr at every fault.  */
 	f = compute_polynom(env->mmu_rand_lfsr);
 	env->mmu_rand_lfsr >>= 1;
 	env->mmu_rand_lfsr |= (f << 15);
 	env->mmu_rand_lfsr &= 0xffff;
 }

 static inline int cris_mmu_enabled(uint32_t rw_gc_cfg)
 {
 	return (rw_gc_cfg & 12) != 0;
 }

 static inline int cris_mmu_segmented_addr(int seg, uint32_t rw_mm_cfg)
 {
 	return (1 << seg) & rw_mm_cfg;
 }

 static uint32_t cris_mmu_translate_seg(CPUCRISState *env, int seg)
 {
 	uint32_t base;
 	int i;

 	if (seg < 8)
 		base = env->sregs[SFR_RW_MM_KBASE_LO];
 	else
 		base = env->sregs[SFR_RW_MM_KBASE_HI];

 	i = seg & 7;
 	base >>= i * 4;
 	base &= 15;

 	base <<= 28;
 	return base;
 }
 /* Used by the tlb decoder.  */
 #define EXTRACT_FIELD(src, start, end) \
 	    (((src) >> start) & ((1 << (end - start + 1)) - 1))

 static inline void set_field(uint32_t *dst, unsigned int val,
 			     unsigned int offset, unsigned int width)
 {
 	uint32_t mask;

 	mask = (1 << width) - 1;
 	mask <<= offset;
 	val <<= offset;

 	val &= mask;
 	*dst &= ~(mask);
 	*dst |= val;
 }

 #ifdef DEBUG
 static void dump_tlb(CPUCRISState *env, int mmu)
 {
 	int set;
 	int idx;
 	uint32_t hi, lo, tlb_vpn, tlb_pfn;

 	for (set = 0; set < 4; set++) {
 		for (idx = 0; idx < 16; idx++) {
 			lo = env->tlbsets[mmu][set][idx].lo;
 			hi = env->tlbsets[mmu][set][idx].hi;
 			tlb_vpn = EXTRACT_FIELD(hi, 13, 31);
 			tlb_pfn = EXTRACT_FIELD(lo, 13, 31);

 			printf ("TLB: [%d][%d] hi=%x lo=%x v=%x p=%x\n",
 					set, idx, hi, lo, tlb_vpn, tlb_pfn);
 		}
 	}
 }
 #endif

 /* rw 0 = read, 1 = write, 2 = exec.  */
 static int cris_mmu_translate_page(struct cris_mmu_result *res,
 				   CPUCRISState *env, uint32_t vaddr,
 				   int rw, int usermode, int debug)
 {
 	unsigned int vpage;
 	unsigned int idx;
 	uint32_t pid, lo, hi;
 	uint32_t tlb_vpn, tlb_pfn = 0;
 	int tlb_pid, tlb_g, tlb_v, tlb_k, tlb_w, tlb_x;
 	int cfg_v, cfg_k, cfg_w, cfg_x;
 	int set, match = 0;
 	uint32_t r_cause;
 	uint32_t r_cfg;
 	int rwcause;
 	int mmu = 1; /* Data mmu is default.  */
 	int vect_base;

 	r_cause = env->sregs[SFR_R_MM_CAUSE];
 	r_cfg = env->sregs[SFR_RW_MM_CFG];
 	pid = env->pregs[PR_PID] & 0xff;

 	switch (rw) {
 		case 2: rwcause = CRIS_MMU_ERR_EXEC; mmu = 0; break;
 		case 1: rwcause = CRIS_MMU_ERR_WRITE; break;
 		default:
 		case 0: rwcause = CRIS_MMU_ERR_READ; break;
 	}

 	/* I exception vectors 4 - 7, D 8 - 11.  */
 	vect_base = (mmu + 1) * 4;

 	vpage = vaddr >> 13;

 	/* We know the index which to check on each set.
 	   Scan both I and D.  */
 #if 0
 	for (set = 0; set < 4; set++) {
 		for (idx = 0; idx < 16; idx++) {
 			lo = env->tlbsets[mmu][set][idx].lo;
 			hi = env->tlbsets[mmu][set][idx].hi;
 			tlb_vpn = EXTRACT_FIELD(hi, 13, 31);
 			tlb_pfn = EXTRACT_FIELD(lo, 13, 31);

 			printf ("TLB: [%d][%d] hi=%x lo=%x v=%x p=%x\n",
 					set, idx, hi, lo, tlb_vpn, tlb_pfn);
 		}
 	}
 #endif

 	idx = vpage & 15;
 	for (set = 0; set < 4; set++)
 	{
 		lo = env->tlbsets[mmu][set][idx].lo;
 		hi = env->tlbsets[mmu][set][idx].hi;

 		tlb_vpn = hi >> 13;
 		tlb_pid = EXTRACT_FIELD(hi, 0, 7);
 		tlb_g  = EXTRACT_FIELD(lo, 4, 4);

 		D_LOG("TLB[%d][%d][%d] v=%x vpage=%x lo=%x hi=%x\n",
 			 mmu, set, idx, tlb_vpn, vpage, lo, hi);
 		if ((tlb_g || (tlb_pid == pid))
 		    && tlb_vpn == vpage) {
 			match = 1;
 			break;
 		}
 	}

 	res->bf_vec = vect_base;
 	if (match) {
 		cfg_w  = EXTRACT_FIELD(r_cfg, 19, 19);
 		cfg_k  = EXTRACT_FIELD(r_cfg, 18, 18);
 		cfg_x  = EXTRACT_FIELD(r_cfg, 17, 17);
 		cfg_v  = EXTRACT_FIELD(r_cfg, 16, 16);

 		tlb_pfn = EXTRACT_FIELD(lo, 13, 31);
 		tlb_v = EXTRACT_FIELD(lo, 3, 3);
 		tlb_k = EXTRACT_FIELD(lo, 2, 2);
 		tlb_w = EXTRACT_FIELD(lo, 1, 1);
 		tlb_x = EXTRACT_FIELD(lo, 0, 0);

 		/*
 		set_exception_vector(0x04, i_mmu_refill);
 		set_exception_vector(0x05, i_mmu_invalid);
 		set_exception_vector(0x06, i_mmu_access);
 		set_exception_vector(0x07, i_mmu_execute);
 		set_exception_vector(0x08, d_mmu_refill);
 		set_exception_vector(0x09, d_mmu_invalid);
 		set_exception_vector(0x0a, d_mmu_access);
 		set_exception_vector(0x0b, d_mmu_write);
 		*/
 		if (cfg_k && tlb_k && usermode) {
 			D(printf ("tlb: kernel protected %x lo=%x pc=%x\n",
 				  vaddr, lo, env->pc));
 			match = 0;
 			res->bf_vec = vect_base + 2;
 		} else if (rw == 1 && cfg_w && !tlb_w) {
 			D(printf ("tlb: write protected %x lo=%x pc=%x\n",
 				  vaddr, lo, env->pc));
 			match = 0;
 			/* write accesses never go through the I mmu.  */
 			res->bf_vec = vect_base + 3;
 		} else if (rw == 2 && cfg_x && !tlb_x) {
 			D(printf ("tlb: exec protected %x lo=%x pc=%x\n",
 				 vaddr, lo, env->pc));
 			match = 0;
 			res->bf_vec = vect_base + 3;
 		} else if (cfg_v && !tlb_v) {
 			D(printf ("tlb: invalid %x\n", vaddr));
 			match = 0;
 			res->bf_vec = vect_base + 1;
 		}

 		res->prot = 0;
 		if (match) {
 			res->prot |= PAGE_READ;
 			if (tlb_w)
 				res->prot |= PAGE_WRITE;
 			if (mmu == 0 && (cfg_x || tlb_x))
 				res->prot |= PAGE_EXEC;
 		}
 		else
 			D(dump_tlb(env, mmu));
 	} else {
 		/* If refill, provide a randomized set.  */
 		set = env->mmu_rand_lfsr & 3;
 	}

 	if (!match && !debug) {
 		cris_mmu_update_rand_lfsr(env);

 		/* Compute index.  */
 		idx = vpage & 15;

 		/* Update RW_MM_TLB_SEL.  */
 		env->sregs[SFR_RW_MM_TLB_SEL] = 0;
 		set_field(&env->sregs[SFR_RW_MM_TLB_SEL], idx, 0, 4);
 		set_field(&env->sregs[SFR_RW_MM_TLB_SEL], set, 4, 2);

 		/* Update RW_MM_CAUSE.  */
 		set_field(&r_cause, rwcause, 8, 2);
 		set_field(&r_cause, vpage, 13, 19);
 		set_field(&r_cause, pid, 0, 8);
 		env->sregs[SFR_R_MM_CAUSE] = r_cause;
 		D(printf("refill vaddr=%x pc=%x\n", vaddr, env->pc));
 	}

 	D(printf ("%s rw=%d mtch=%d pc=%x va=%x vpn=%x tlbvpn=%x pfn=%x pid=%x"
 		  " %x cause=%x sel=%x sp=%x %x %x\n",
 		  __func__, rw, match, env->pc,
 		  vaddr, vpage,
 		  tlb_vpn, tlb_pfn, tlb_pid,
 		  pid,
 		  r_cause,
 		  env->sregs[SFR_RW_MM_TLB_SEL],
 		  env->regs[R_SP], env->pregs[PR_USP], env->ksp));

 	res->phy = tlb_pfn << TARGET_PAGE_BITS;
 	return !match;
 }

 void cris_mmu_flush_pid(CPUCRISState *env, uint32_t pid)
 {
     CRISCPU *cpu = cris_env_get_cpu(env);
 	target_ulong vaddr;
 	unsigned int idx;
 	uint32_t lo, hi;
 	uint32_t tlb_vpn;
 	int tlb_pid, tlb_g, tlb_v;
 	unsigned int set;
 	unsigned int mmu;

 	pid &= 0xff;
 	for (mmu = 0; mmu < 2; mmu++) {
 		for (set = 0; set < 4; set++)
 		{
 			for (idx = 0; idx < 16; idx++) {
 				lo = env->tlbsets[mmu][set][idx].lo;
 				hi = env->tlbsets[mmu][set][idx].hi;

 				tlb_vpn = EXTRACT_FIELD(hi, 13, 31);
 				tlb_pid = EXTRACT_FIELD(hi, 0, 7);
 				tlb_g  = EXTRACT_FIELD(lo, 4, 4);
 				tlb_v = EXTRACT_FIELD(lo, 3, 3);

 				if (tlb_v && !tlb_g && (tlb_pid == pid)) {
 					vaddr = tlb_vpn << TARGET_PAGE_BITS;
 					D_LOG("flush pid=%x vaddr=%x\n",
 						  pid, vaddr);
                     tlb_flush_page(CPU(cpu), vaddr);
 				}
 			}
 		}
 	}
 }

 int cris_mmu_translate(struct cris_mmu_result *res,
 		       CPUCRISState *env, uint32_t vaddr,
 		       int rw, int mmu_idx, int debug)
 {
 	int seg;
 	int miss = 0;
 	int is_user = mmu_idx == MMU_USER_IDX;
 	uint32_t old_srs;

 	old_srs= env->pregs[PR_SRS];

 	/* rw == 2 means exec, map the access to the insn mmu.  */
 	env->pregs[PR_SRS] = rw == 2 ? 1 : 2;

 	if (!cris_mmu_enabled(env->sregs[SFR_RW_GC_CFG])) {
 		res->phy = vaddr;
 		res->prot = PAGE_BITS;
 		goto done;
 	}

 	seg = vaddr >> 28;
 	if (!is_user && cris_mmu_segmented_addr(seg, env->sregs[SFR_RW_MM_CFG]))
 	{
 		uint32_t base;

 		miss = 0;
 		base = cris_mmu_translate_seg(env, seg);
                 res->phy = base | (0x0fffffff & vaddr);
 		res->prot = PAGE_BITS;
 	} else {
 		miss = cris_mmu_translate_page(res, env, vaddr, rw,
 					       is_user, debug);
 	}
   done:
 	env->pregs[PR_SRS] = old_srs;
 	return miss;
 }
	/*
	* CRIS mmu emulation.
	*
	* Copyright (c) 2007 AXIS Communications AB
	* Written by Edgar E. Iglesias.
	*
	* 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 "qemu/osdep.h"
	#include "cpu.h"
	#include "exec/exec-all.h"
	#include "mmu.h"

	#ifdef DEBUG
	#define D(x) x
	#define D_LOG(...) qemu_log(__VA_ARGS__)
	#else
	#define D(x) do { } while (0)
	#define D_LOG(...) do { } while (0)
	#endif

	void cris_mmu_init(CPUCRISState *env)
	{
	env->mmu_rand_lfsr = 0xcccc;
	}

	#define SR_POLYNOM 0x8805
	static inline unsigned int compute_polynom(unsigned int sr)
	{
	unsigned int i;
	unsigned int f;

	f = 0;
	for (i = 0; i < 16; i++)
	f += ((SR_POLYNOM >> i) & 1) & ((sr >> i) & 1);

	return f;
	}

	static void cris_mmu_update_rand_lfsr(CPUCRISState *env)
	{
	unsigned int f;

	/* Update lfsr at every fault. */
	f = compute_polynom(env->mmu_rand_lfsr);
	env->mmu_rand_lfsr >>= 1;
	env->mmu_rand_lfsr \|= (f << 15);
	env->mmu_rand_lfsr &= 0xffff;
	}

	static inline int cris_mmu_enabled(uint32_t rw_gc_cfg)
	{
	return (rw_gc_cfg & 12) != 0;
	}

	static inline int cris_mmu_segmented_addr(int seg, uint32_t rw_mm_cfg)
	{
	return (1 << seg) & rw_mm_cfg;
	}

	static uint32_t cris_mmu_translate_seg(CPUCRISState *env, int seg)
	{
	uint32_t base;
	int i;

	if (seg < 8)
	base = env->sregs[SFR_RW_MM_KBASE_LO];
	else
	base = env->sregs[SFR_RW_MM_KBASE_HI];

	i = seg & 7;
	base >>= i * 4;
	base &= 15;

	base <<= 28;
	return base;
	}
	/* Used by the tlb decoder. */
	#define EXTRACT_FIELD(src, start, end) \
	(((src) >> start) & ((1 << (end - start + 1)) - 1))

	static inline void set_field(uint32_t *dst, unsigned int val,
	unsigned int offset, unsigned int width)
	{
	uint32_t mask;

	mask = (1 << width) - 1;
	mask <<= offset;
	val <<= offset;

	val &= mask;
	*dst &= ~(mask);
	*dst \|= val;
	}

	#ifdef DEBUG
	static void dump_tlb(CPUCRISState *env, int mmu)
	{
	int set;
	int idx;
	uint32_t hi, lo, tlb_vpn, tlb_pfn;

	for (set = 0; set < 4; set++) {
	for (idx = 0; idx < 16; idx++) {
	lo = env->tlbsets[mmu][set][idx].lo;
	hi = env->tlbsets[mmu][set][idx].hi;
	tlb_vpn = EXTRACT_FIELD(hi, 13, 31);
	tlb_pfn = EXTRACT_FIELD(lo, 13, 31);

	printf ("TLB: [%d][%d] hi=%x lo=%x v=%x p=%x\n",
	set, idx, hi, lo, tlb_vpn, tlb_pfn);
	}
	}
	}
	#endif

	/* rw 0 = read, 1 = write, 2 = exec. */
	static int cris_mmu_translate_page(struct cris_mmu_result *res,
	CPUCRISState *env, uint32_t vaddr,
	int rw, int usermode, int debug)
	{
	unsigned int vpage;
	unsigned int idx;
	uint32_t pid, lo, hi;
	uint32_t tlb_vpn, tlb_pfn = 0;
	int tlb_pid, tlb_g, tlb_v, tlb_k, tlb_w, tlb_x;
	int cfg_v, cfg_k, cfg_w, cfg_x;
	int set, match = 0;
	uint32_t r_cause;
	uint32_t r_cfg;
	int rwcause;
	int mmu = 1; /* Data mmu is default. */
	int vect_base;

	r_cause = env->sregs[SFR_R_MM_CAUSE];
	r_cfg = env->sregs[SFR_RW_MM_CFG];
	pid = env->pregs[PR_PID] & 0xff;

	switch (rw) {
	case 2: rwcause = CRIS_MMU_ERR_EXEC; mmu = 0; break;
	case 1: rwcause = CRIS_MMU_ERR_WRITE; break;
	default:
	case 0: rwcause = CRIS_MMU_ERR_READ; break;
	}

	/* I exception vectors 4 - 7, D 8 - 11. */
	vect_base = (mmu + 1) * 4;

	vpage = vaddr >> 13;

	/* We know the index which to check on each set.
	Scan both I and D. */
	#if 0
	for (set = 0; set < 4; set++) {
	for (idx = 0; idx < 16; idx++) {
	lo = env->tlbsets[mmu][set][idx].lo;
	hi = env->tlbsets[mmu][set][idx].hi;
	tlb_vpn = EXTRACT_FIELD(hi, 13, 31);
	tlb_pfn = EXTRACT_FIELD(lo, 13, 31);

	printf ("TLB: [%d][%d] hi=%x lo=%x v=%x p=%x\n",
	set, idx, hi, lo, tlb_vpn, tlb_pfn);
	}
	}
	#endif

	idx = vpage & 15;
	for (set = 0; set < 4; set++)
	{
	lo = env->tlbsets[mmu][set][idx].lo;
	hi = env->tlbsets[mmu][set][idx].hi;

	tlb_vpn = hi >> 13;
	tlb_pid = EXTRACT_FIELD(hi, 0, 7);
	tlb_g = EXTRACT_FIELD(lo, 4, 4);

	D_LOG("TLB[%d][%d][%d] v=%x vpage=%x lo=%x hi=%x\n",
	mmu, set, idx, tlb_vpn, vpage, lo, hi);
	if ((tlb_g \|\| (tlb_pid == pid))
	&& tlb_vpn == vpage) {
	match = 1;
	break;
	}
	}

	res->bf_vec = vect_base;
	if (match) {
	cfg_w = EXTRACT_FIELD(r_cfg, 19, 19);
	cfg_k = EXTRACT_FIELD(r_cfg, 18, 18);
	cfg_x = EXTRACT_FIELD(r_cfg, 17, 17);
	cfg_v = EXTRACT_FIELD(r_cfg, 16, 16);

	tlb_pfn = EXTRACT_FIELD(lo, 13, 31);
	tlb_v = EXTRACT_FIELD(lo, 3, 3);
	tlb_k = EXTRACT_FIELD(lo, 2, 2);
	tlb_w = EXTRACT_FIELD(lo, 1, 1);
	tlb_x = EXTRACT_FIELD(lo, 0, 0);

	/*
	set_exception_vector(0x04, i_mmu_refill);
	set_exception_vector(0x05, i_mmu_invalid);
	set_exception_vector(0x06, i_mmu_access);
	set_exception_vector(0x07, i_mmu_execute);
	set_exception_vector(0x08, d_mmu_refill);
	set_exception_vector(0x09, d_mmu_invalid);
	set_exception_vector(0x0a, d_mmu_access);
	set_exception_vector(0x0b, d_mmu_write);
	*/
	if (cfg_k && tlb_k && usermode) {
	D(printf ("tlb: kernel protected %x lo=%x pc=%x\n",
	vaddr, lo, env->pc));
	match = 0;
	res->bf_vec = vect_base + 2;
	} else if (rw == 1 && cfg_w && !tlb_w) {
	D(printf ("tlb: write protected %x lo=%x pc=%x\n",
	vaddr, lo, env->pc));
	match = 0;
	/* write accesses never go through the I mmu. */
	res->bf_vec = vect_base + 3;
	} else if (rw == 2 && cfg_x && !tlb_x) {
	D(printf ("tlb: exec protected %x lo=%x pc=%x\n",
	vaddr, lo, env->pc));
	match = 0;
	res->bf_vec = vect_base + 3;
	} else if (cfg_v && !tlb_v) {
	D(printf ("tlb: invalid %x\n", vaddr));
	match = 0;
	res->bf_vec = vect_base + 1;
	}

	res->prot = 0;
	if (match) {
	res->prot \|= PAGE_READ;
	if (tlb_w)
	res->prot \|= PAGE_WRITE;
	if (mmu == 0 && (cfg_x \|\| tlb_x))
	res->prot \|= PAGE_EXEC;
	}
	else
	D(dump_tlb(env, mmu));
	} else {
	/* If refill, provide a randomized set. */
	set = env->mmu_rand_lfsr & 3;
	}

	if (!match && !debug) {
	cris_mmu_update_rand_lfsr(env);

	/* Compute index. */
	idx = vpage & 15;

	/* Update RW_MM_TLB_SEL. */
	env->sregs[SFR_RW_MM_TLB_SEL] = 0;
	set_field(&env->sregs[SFR_RW_MM_TLB_SEL], idx, 0, 4);
	set_field(&env->sregs[SFR_RW_MM_TLB_SEL], set, 4, 2);

	/* Update RW_MM_CAUSE. */
	set_field(&r_cause, rwcause, 8, 2);
	set_field(&r_cause, vpage, 13, 19);
	set_field(&r_cause, pid, 0, 8);
	env->sregs[SFR_R_MM_CAUSE] = r_cause;
	D(printf("refill vaddr=%x pc=%x\n", vaddr, env->pc));
	}

	D(printf ("%s rw=%d mtch=%d pc=%x va=%x vpn=%x tlbvpn=%x pfn=%x pid=%x"
	" %x cause=%x sel=%x sp=%x %x %x\n",
	__func__, rw, match, env->pc,
	vaddr, vpage,
	tlb_vpn, tlb_pfn, tlb_pid,
	pid,
	r_cause,
	env->sregs[SFR_RW_MM_TLB_SEL],
	env->regs[R_SP], env->pregs[PR_USP], env->ksp));

	res->phy = tlb_pfn << TARGET_PAGE_BITS;
	return !match;
	}

	void cris_mmu_flush_pid(CPUCRISState *env, uint32_t pid)
	{
	CRISCPU *cpu = cris_env_get_cpu(env);
	target_ulong vaddr;
	unsigned int idx;
	uint32_t lo, hi;
	uint32_t tlb_vpn;
	int tlb_pid, tlb_g, tlb_v;
	unsigned int set;
	unsigned int mmu;

	pid &= 0xff;
	for (mmu = 0; mmu < 2; mmu++) {
	for (set = 0; set < 4; set++)
	{
	for (idx = 0; idx < 16; idx++) {
	lo = env->tlbsets[mmu][set][idx].lo;
	hi = env->tlbsets[mmu][set][idx].hi;

	tlb_vpn = EXTRACT_FIELD(hi, 13, 31);
	tlb_pid = EXTRACT_FIELD(hi, 0, 7);
	tlb_g = EXTRACT_FIELD(lo, 4, 4);
	tlb_v = EXTRACT_FIELD(lo, 3, 3);

	if (tlb_v && !tlb_g && (tlb_pid == pid)) {
	vaddr = tlb_vpn << TARGET_PAGE_BITS;
	D_LOG("flush pid=%x vaddr=%x\n",
	pid, vaddr);
	tlb_flush_page(CPU(cpu), vaddr);
	}
	}
	}
	}
	}

	int cris_mmu_translate(struct cris_mmu_result *res,
	CPUCRISState *env, uint32_t vaddr,
	int rw, int mmu_idx, int debug)
	{
	int seg;
	int miss = 0;
	int is_user = mmu_idx == MMU_USER_IDX;
	uint32_t old_srs;

	old_srs= env->pregs[PR_SRS];

	/* rw == 2 means exec, map the access to the insn mmu. */
	env->pregs[PR_SRS] = rw == 2 ? 1 : 2;

	if (!cris_mmu_enabled(env->sregs[SFR_RW_GC_CFG])) {
	res->phy = vaddr;
	res->prot = PAGE_BITS;
	goto done;
	}

	seg = vaddr >> 28;
	if (!is_user && cris_mmu_segmented_addr(seg, env->sregs[SFR_RW_MM_CFG]))
	{
	uint32_t base;

	miss = 0;
	base = cris_mmu_translate_seg(env, seg);
	res->phy = base \| (0x0fffffff & vaddr);
	res->prot = PAGE_BITS;
	} else {
	miss = cris_mmu_translate_page(res, env, vaddr, rw,
	is_user, debug);
	}
	done:
	env->pregs[PR_SRS] = old_srs;
	return miss;
	}