target/ppc/misc_helper.c - qemu - Git at Google

 /*
  * Miscellaneous PowerPC emulation helpers for QEMU.
  *
  *  Copyright (c) 2003-2007 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 2.1 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 "qemu/log.h"
 #include "cpu.h"
 #include "exec/exec-all.h"
 #include "exec/helper-proto.h"
 #include "qemu/error-report.h"
 #include "qemu/main-loop.h"
 #include "mmu-book3s-v3.h"
 #include "hw/ppc/ppc.h"

 #include "helper_regs.h"

 /*****************************************************************************/
 /* SPR accesses */
 void helper_load_dump_spr(CPUPPCState *env, uint32_t sprn)
 {
     qemu_log("Read SPR %d %03x => " TARGET_FMT_lx "\n", sprn, sprn,
              env->spr[sprn]);
 }

 void helper_store_dump_spr(CPUPPCState *env, uint32_t sprn)
 {
     qemu_log("Write SPR %d %03x <= " TARGET_FMT_lx "\n", sprn, sprn,
              env->spr[sprn]);
 }

 void helper_spr_core_write_generic(CPUPPCState *env, uint32_t sprn,
                                    target_ulong val)
 {
     CPUState *cs = env_cpu(env);
     CPUState *ccs;
     uint32_t nr_threads = cs->nr_threads;

     if (nr_threads == 1) {
         env->spr[sprn] = val;
         return;
     }

     THREAD_SIBLING_FOREACH(cs, ccs) {
         CPUPPCState *cenv = &POWERPC_CPU(ccs)->env;
         cenv->spr[sprn] = val;
     }
 }

 void helper_spr_write_CTRL(CPUPPCState *env, uint32_t sprn,
                            target_ulong val)
 {
     CPUState *cs = env_cpu(env);
     CPUState *ccs;
     uint32_t run = val & 1;
     uint32_t ts, ts_mask;

     assert(sprn == SPR_CTRL);

     env->spr[sprn] &= ~1U;
     env->spr[sprn] |= run;

     ts_mask = ~(1U << (8 + env->spr[SPR_TIR]));
     ts = run << (8 + env->spr[SPR_TIR]);

     THREAD_SIBLING_FOREACH(cs, ccs) {
         CPUPPCState *cenv = &POWERPC_CPU(ccs)->env;

         cenv->spr[sprn] &= ts_mask;
         cenv->spr[sprn] |= ts;
     }
 }


 #ifdef TARGET_PPC64
 static void raise_hv_fu_exception(CPUPPCState *env, uint32_t bit,
                                   const char *caller, uint32_t cause,
                                   uintptr_t raddr)
 {
     qemu_log_mask(CPU_LOG_INT, "HV Facility %d is unavailable (%s)\n",
                   bit, caller);

     env->spr[SPR_HFSCR] &= ~((target_ulong)FSCR_IC_MASK << FSCR_IC_POS);

     raise_exception_err_ra(env, POWERPC_EXCP_HV_FU, cause, raddr);
 }

 static void raise_fu_exception(CPUPPCState *env, uint32_t bit,
                                uint32_t sprn, uint32_t cause,
                                uintptr_t raddr)
 {
     qemu_log("Facility SPR %d is unavailable (SPR FSCR:%d)\n", sprn, bit);

     env->spr[SPR_FSCR] &= ~((target_ulong)FSCR_IC_MASK << FSCR_IC_POS);
     cause &= FSCR_IC_MASK;
     env->spr[SPR_FSCR] |= (target_ulong)cause << FSCR_IC_POS;

     raise_exception_err_ra(env, POWERPC_EXCP_FU, 0, raddr);
 }
 #endif

 void helper_hfscr_facility_check(CPUPPCState *env, uint32_t bit,
                                  const char *caller, uint32_t cause)
 {
 #ifdef TARGET_PPC64
     if ((env->msr_mask & MSR_HVB) && !FIELD_EX64(env->msr, MSR, HV) &&
                                      !(env->spr[SPR_HFSCR] & (1UL << bit))) {
         raise_hv_fu_exception(env, bit, caller, cause, GETPC());
     }
 #endif
 }

 void helper_fscr_facility_check(CPUPPCState *env, uint32_t bit,
                                 uint32_t sprn, uint32_t cause)
 {
 #ifdef TARGET_PPC64
     if (env->spr[SPR_FSCR] & (1ULL << bit)) {
         /* Facility is enabled, continue */
         return;
     }
     raise_fu_exception(env, bit, sprn, cause, GETPC());
 #endif
 }

 void helper_msr_facility_check(CPUPPCState *env, uint32_t bit,
                                uint32_t sprn, uint32_t cause)
 {
 #ifdef TARGET_PPC64
     if (env->msr & (1ULL << bit)) {
         /* Facility is enabled, continue */
         return;
     }
     raise_fu_exception(env, bit, sprn, cause, GETPC());
 #endif
 }

 #if !defined(CONFIG_USER_ONLY)

 void helper_store_sdr1(CPUPPCState *env, target_ulong val)
 {
     if (env->spr[SPR_SDR1] != val) {
         ppc_store_sdr1(env, val);
         tlb_flush(env_cpu(env));
     }
 }

 #if defined(TARGET_PPC64)
 void helper_store_ptcr(CPUPPCState *env, target_ulong val)
 {
     if (env->spr[SPR_PTCR] != val) {
         PowerPCCPU *cpu = env_archcpu(env);
         target_ulong ptcr_mask = PTCR_PATB | PTCR_PATS;
         target_ulong patbsize = val & PTCR_PATS;

         qemu_log_mask(CPU_LOG_MMU, "%s: " TARGET_FMT_lx "\n", __func__, val);

         assert(!cpu->vhyp);
         assert(env->mmu_model & POWERPC_MMU_3_00);

         if (val & ~ptcr_mask) {
             error_report("Invalid bits 0x"TARGET_FMT_lx" set in PTCR",
                          val & ~ptcr_mask);
             val &= ptcr_mask;
         }

         if (patbsize > 24) {
             error_report("Invalid Partition Table size 0x" TARGET_FMT_lx
                          " stored in PTCR", patbsize);
             return;
         }

         env->spr[SPR_PTCR] = val;
         tlb_flush(env_cpu(env));
     }
 }

 void helper_store_pcr(CPUPPCState *env, target_ulong value)
 {
     PowerPCCPU *cpu = env_archcpu(env);
     PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);

     env->spr[SPR_PCR] = value & pcc->pcr_mask;
 }

 void helper_store_ciabr(CPUPPCState *env, target_ulong value)
 {
     ppc_store_ciabr(env, value);
 }

 void helper_store_dawr0(CPUPPCState *env, target_ulong value)
 {
     ppc_store_dawr0(env, value);
 }

 void helper_store_dawrx0(CPUPPCState *env, target_ulong value)
 {
     ppc_store_dawrx0(env, value);
 }

 /*
  * DPDES register is shared. Each bit reflects the state of the
  * doorbell interrupt of a thread of the same core.
  */
 target_ulong helper_load_dpdes(CPUPPCState *env)
 {
     CPUState *cs = env_cpu(env);
     CPUState *ccs;
     uint32_t nr_threads = cs->nr_threads;
     target_ulong dpdes = 0;

     helper_hfscr_facility_check(env, HFSCR_MSGP, "load DPDES", HFSCR_IC_MSGP);

     if (!(env->flags & POWERPC_FLAG_SMT_1LPAR)) {
         nr_threads = 1; /* DPDES behaves as 1-thread in LPAR-per-thread mode */
     }

     if (nr_threads == 1) {
         if (env->pending_interrupts & PPC_INTERRUPT_DOORBELL) {
             dpdes = 1;
         }
         return dpdes;
     }

     bql_lock();
     THREAD_SIBLING_FOREACH(cs, ccs) {
         PowerPCCPU *ccpu = POWERPC_CPU(ccs);
         CPUPPCState *cenv = &ccpu->env;
         uint32_t thread_id = ppc_cpu_tir(ccpu);

         if (cenv->pending_interrupts & PPC_INTERRUPT_DOORBELL) {
             dpdes |= (0x1 << thread_id);
         }
     }
     bql_unlock();

     return dpdes;
 }

 void helper_store_dpdes(CPUPPCState *env, target_ulong val)
 {
     PowerPCCPU *cpu = env_archcpu(env);
     CPUState *cs = env_cpu(env);
     CPUState *ccs;
     uint32_t nr_threads = cs->nr_threads;

     helper_hfscr_facility_check(env, HFSCR_MSGP, "store DPDES", HFSCR_IC_MSGP);

     if (!(env->flags & POWERPC_FLAG_SMT_1LPAR)) {
         nr_threads = 1; /* DPDES behaves as 1-thread in LPAR-per-thread mode */
     }

     if (val & ~(nr_threads - 1)) {
         qemu_log_mask(LOG_GUEST_ERROR, "Invalid DPDES register value "
                       TARGET_FMT_lx"\n", val);
         val &= (nr_threads - 1); /* Ignore the invalid bits */
     }

     if (nr_threads == 1) {
         ppc_set_irq(cpu, PPC_INTERRUPT_DOORBELL, val & 0x1);
         return;
     }

     /* Does iothread need to be locked for walking CPU list? */
     bql_lock();
     THREAD_SIBLING_FOREACH(cs, ccs) {
         PowerPCCPU *ccpu = POWERPC_CPU(ccs);
         uint32_t thread_id = ppc_cpu_tir(ccpu);

         ppc_set_irq(cpu, PPC_INTERRUPT_DOORBELL, val & (0x1 << thread_id));
     }
     bql_unlock();
 }
 #endif /* defined(TARGET_PPC64) */

 void helper_store_pidr(CPUPPCState *env, target_ulong val)
 {
     env->spr[SPR_BOOKS_PID] = (uint32_t)val;
     tlb_flush(env_cpu(env));
 }

 void helper_store_lpidr(CPUPPCState *env, target_ulong val)
 {
     env->spr[SPR_LPIDR] = (uint32_t)val;

     /*
      * We need to flush the TLB on LPID changes as we only tag HV vs
      * guest in TCG TLB. Also the quadrants means the HV will
      * potentially access and cache entries for the current LPID as
      * well.
      */
     tlb_flush(env_cpu(env));
 }

 void helper_store_40x_dbcr0(CPUPPCState *env, target_ulong val)
 {
     /* Bits 26 & 27 affect single-stepping. */
     hreg_compute_hflags(env);
     /* Bits 28 & 29 affect reset or shutdown. */
     store_40x_dbcr0(env, val);
 }

 void helper_store_40x_sler(CPUPPCState *env, target_ulong val)
 {
     store_40x_sler(env, val);
 }
 #endif

 /*****************************************************************************/
 /* Special registers manipulation */

 /*
  * This code is lifted from MacOnLinux. It is called whenever THRM1,2
  * or 3 is read an fixes up the values in such a way that will make
  * MacOS not hang. These registers exist on some 75x and 74xx
  * processors.
  */
 void helper_fixup_thrm(CPUPPCState *env)
 {
     target_ulong v, t;
     int i;

 #define THRM1_TIN       (1 << 31)
 #define THRM1_TIV       (1 << 30)
 #define THRM1_THRES(x)  (((x) & 0x7f) << 23)
 #define THRM1_TID       (1 << 2)
 #define THRM1_TIE       (1 << 1)
 #define THRM1_V         (1 << 0)
 #define THRM3_E         (1 << 0)

     if (!(env->spr[SPR_THRM3] & THRM3_E)) {
         return;
     }

     /* Note: Thermal interrupts are unimplemented */
     for (i = SPR_THRM1; i <= SPR_THRM2; i++) {
         v = env->spr[i];
         if (!(v & THRM1_V)) {
             continue;
         }
         v |= THRM1_TIV;
         v &= ~THRM1_TIN;
         t = v & THRM1_THRES(127);
         if ((v & THRM1_TID) && t < THRM1_THRES(24)) {
             v |= THRM1_TIN;
         }
         if (!(v & THRM1_TID) && t > THRM1_THRES(24)) {
             v |= THRM1_TIN;
         }
         env->spr[i] = v;
     }
 }
	/*
	* Miscellaneous PowerPC emulation helpers for QEMU.
	*
	* Copyright (c) 2003-2007 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 2.1 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 "qemu/log.h"
	#include "cpu.h"
	#include "exec/exec-all.h"
	#include "exec/helper-proto.h"
	#include "qemu/error-report.h"
	#include "qemu/main-loop.h"
	#include "mmu-book3s-v3.h"
	#include "hw/ppc/ppc.h"

	#include "helper_regs.h"

	/*****************************************************************************/
	/* SPR accesses */
	void helper_load_dump_spr(CPUPPCState *env, uint32_t sprn)
	{
	qemu_log("Read SPR %d %03x => " TARGET_FMT_lx "\n", sprn, sprn,
	env->spr[sprn]);
	}

	void helper_store_dump_spr(CPUPPCState *env, uint32_t sprn)
	{
	qemu_log("Write SPR %d %03x <= " TARGET_FMT_lx "\n", sprn, sprn,
	env->spr[sprn]);
	}

	void helper_spr_core_write_generic(CPUPPCState *env, uint32_t sprn,
	target_ulong val)
	{
	CPUState *cs = env_cpu(env);
	CPUState *ccs;
	uint32_t nr_threads = cs->nr_threads;

	if (nr_threads == 1) {
	env->spr[sprn] = val;
	return;
	}

	THREAD_SIBLING_FOREACH(cs, ccs) {
	CPUPPCState *cenv = &POWERPC_CPU(ccs)->env;
	cenv->spr[sprn] = val;
	}
	}

	void helper_spr_write_CTRL(CPUPPCState *env, uint32_t sprn,
	target_ulong val)
	{
	CPUState *cs = env_cpu(env);
	CPUState *ccs;
	uint32_t run = val & 1;
	uint32_t ts, ts_mask;

	assert(sprn == SPR_CTRL);

	env->spr[sprn] &= ~1U;
	env->spr[sprn] \|= run;

	ts_mask = ~(1U << (8 + env->spr[SPR_TIR]));
	ts = run << (8 + env->spr[SPR_TIR]);

	THREAD_SIBLING_FOREACH(cs, ccs) {
	CPUPPCState *cenv = &POWERPC_CPU(ccs)->env;

	cenv->spr[sprn] &= ts_mask;
	cenv->spr[sprn] \|= ts;
	}
	}


	#ifdef TARGET_PPC64
	static void raise_hv_fu_exception(CPUPPCState *env, uint32_t bit,
	const char *caller, uint32_t cause,
	uintptr_t raddr)
	{
	qemu_log_mask(CPU_LOG_INT, "HV Facility %d is unavailable (%s)\n",
	bit, caller);

	env->spr[SPR_HFSCR] &= ~((target_ulong)FSCR_IC_MASK << FSCR_IC_POS);

	raise_exception_err_ra(env, POWERPC_EXCP_HV_FU, cause, raddr);
	}

	static void raise_fu_exception(CPUPPCState *env, uint32_t bit,
	uint32_t sprn, uint32_t cause,
	uintptr_t raddr)
	{
	qemu_log("Facility SPR %d is unavailable (SPR FSCR:%d)\n", sprn, bit);

	env->spr[SPR_FSCR] &= ~((target_ulong)FSCR_IC_MASK << FSCR_IC_POS);
	cause &= FSCR_IC_MASK;
	env->spr[SPR_FSCR] \|= (target_ulong)cause << FSCR_IC_POS;

	raise_exception_err_ra(env, POWERPC_EXCP_FU, 0, raddr);
	}
	#endif

	void helper_hfscr_facility_check(CPUPPCState *env, uint32_t bit,
	const char *caller, uint32_t cause)
	{
	#ifdef TARGET_PPC64
	if ((env->msr_mask & MSR_HVB) && !FIELD_EX64(env->msr, MSR, HV) &&
	!(env->spr[SPR_HFSCR] & (1UL << bit))) {
	raise_hv_fu_exception(env, bit, caller, cause, GETPC());
	}
	#endif
	}

	void helper_fscr_facility_check(CPUPPCState *env, uint32_t bit,
	uint32_t sprn, uint32_t cause)
	{
	#ifdef TARGET_PPC64
	if (env->spr[SPR_FSCR] & (1ULL << bit)) {
	/* Facility is enabled, continue */
	return;
	}
	raise_fu_exception(env, bit, sprn, cause, GETPC());
	#endif
	}

	void helper_msr_facility_check(CPUPPCState *env, uint32_t bit,
	uint32_t sprn, uint32_t cause)
	{
	#ifdef TARGET_PPC64
	if (env->msr & (1ULL << bit)) {
	/* Facility is enabled, continue */
	return;
	}
	raise_fu_exception(env, bit, sprn, cause, GETPC());
	#endif
	}

	#if !defined(CONFIG_USER_ONLY)

	void helper_store_sdr1(CPUPPCState *env, target_ulong val)
	{
	if (env->spr[SPR_SDR1] != val) {
	ppc_store_sdr1(env, val);
	tlb_flush(env_cpu(env));
	}
	}

	#if defined(TARGET_PPC64)
	void helper_store_ptcr(CPUPPCState *env, target_ulong val)
	{
	if (env->spr[SPR_PTCR] != val) {
	PowerPCCPU *cpu = env_archcpu(env);
	target_ulong ptcr_mask = PTCR_PATB \| PTCR_PATS;
	target_ulong patbsize = val & PTCR_PATS;

	qemu_log_mask(CPU_LOG_MMU, "%s: " TARGET_FMT_lx "\n", __func__, val);

	assert(!cpu->vhyp);
	assert(env->mmu_model & POWERPC_MMU_3_00);

	if (val & ~ptcr_mask) {
	error_report("Invalid bits 0x"TARGET_FMT_lx" set in PTCR",
	val & ~ptcr_mask);
	val &= ptcr_mask;
	}

	if (patbsize > 24) {
	error_report("Invalid Partition Table size 0x" TARGET_FMT_lx
	" stored in PTCR", patbsize);
	return;
	}

	env->spr[SPR_PTCR] = val;
	tlb_flush(env_cpu(env));
	}
	}

	void helper_store_pcr(CPUPPCState *env, target_ulong value)
	{
	PowerPCCPU *cpu = env_archcpu(env);
	PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);

	env->spr[SPR_PCR] = value & pcc->pcr_mask;
	}

	void helper_store_ciabr(CPUPPCState *env, target_ulong value)
	{
	ppc_store_ciabr(env, value);
	}

	void helper_store_dawr0(CPUPPCState *env, target_ulong value)
	{
	ppc_store_dawr0(env, value);
	}

	void helper_store_dawrx0(CPUPPCState *env, target_ulong value)
	{
	ppc_store_dawrx0(env, value);
	}

	/*
	* DPDES register is shared. Each bit reflects the state of the
	* doorbell interrupt of a thread of the same core.
	*/
	target_ulong helper_load_dpdes(CPUPPCState *env)
	{
	CPUState *cs = env_cpu(env);
	CPUState *ccs;
	uint32_t nr_threads = cs->nr_threads;
	target_ulong dpdes = 0;

	helper_hfscr_facility_check(env, HFSCR_MSGP, "load DPDES", HFSCR_IC_MSGP);

	if (!(env->flags & POWERPC_FLAG_SMT_1LPAR)) {
	nr_threads = 1; /* DPDES behaves as 1-thread in LPAR-per-thread mode */
	}

	if (nr_threads == 1) {
	if (env->pending_interrupts & PPC_INTERRUPT_DOORBELL) {
	dpdes = 1;
	}
	return dpdes;
	}

	bql_lock();
	THREAD_SIBLING_FOREACH(cs, ccs) {
	PowerPCCPU *ccpu = POWERPC_CPU(ccs);
	CPUPPCState *cenv = &ccpu->env;
	uint32_t thread_id = ppc_cpu_tir(ccpu);

	if (cenv->pending_interrupts & PPC_INTERRUPT_DOORBELL) {
	dpdes \|= (0x1 << thread_id);
	}
	}
	bql_unlock();

	return dpdes;
	}

	void helper_store_dpdes(CPUPPCState *env, target_ulong val)
	{
	PowerPCCPU *cpu = env_archcpu(env);
	CPUState *cs = env_cpu(env);
	CPUState *ccs;
	uint32_t nr_threads = cs->nr_threads;

	helper_hfscr_facility_check(env, HFSCR_MSGP, "store DPDES", HFSCR_IC_MSGP);

	if (!(env->flags & POWERPC_FLAG_SMT_1LPAR)) {
	nr_threads = 1; /* DPDES behaves as 1-thread in LPAR-per-thread mode */
	}

	if (val & ~(nr_threads - 1)) {
	qemu_log_mask(LOG_GUEST_ERROR, "Invalid DPDES register value "
	TARGET_FMT_lx"\n", val);
	val &= (nr_threads - 1); /* Ignore the invalid bits */
	}

	if (nr_threads == 1) {
	ppc_set_irq(cpu, PPC_INTERRUPT_DOORBELL, val & 0x1);
	return;
	}

	/* Does iothread need to be locked for walking CPU list? */
	bql_lock();
	THREAD_SIBLING_FOREACH(cs, ccs) {
	PowerPCCPU *ccpu = POWERPC_CPU(ccs);
	uint32_t thread_id = ppc_cpu_tir(ccpu);

	ppc_set_irq(cpu, PPC_INTERRUPT_DOORBELL, val & (0x1 << thread_id));
	}
	bql_unlock();
	}
	#endif /* defined(TARGET_PPC64) */

	void helper_store_pidr(CPUPPCState *env, target_ulong val)
	{
	env->spr[SPR_BOOKS_PID] = (uint32_t)val;
	tlb_flush(env_cpu(env));
	}

	void helper_store_lpidr(CPUPPCState *env, target_ulong val)
	{
	env->spr[SPR_LPIDR] = (uint32_t)val;

	/*
	* We need to flush the TLB on LPID changes as we only tag HV vs
	* guest in TCG TLB. Also the quadrants means the HV will
	* potentially access and cache entries for the current LPID as
	* well.
	*/
	tlb_flush(env_cpu(env));
	}

	void helper_store_40x_dbcr0(CPUPPCState *env, target_ulong val)
	{
	/* Bits 26 & 27 affect single-stepping. */
	hreg_compute_hflags(env);
	/* Bits 28 & 29 affect reset or shutdown. */
	store_40x_dbcr0(env, val);
	}

	void helper_store_40x_sler(CPUPPCState *env, target_ulong val)
	{
	store_40x_sler(env, val);
	}
	#endif

	/*****************************************************************************/
	/* Special registers manipulation */

	/*
	* This code is lifted from MacOnLinux. It is called whenever THRM1,2
	* or 3 is read an fixes up the values in such a way that will make
	* MacOS not hang. These registers exist on some 75x and 74xx
	* processors.
	*/
	void helper_fixup_thrm(CPUPPCState *env)
	{
	target_ulong v, t;
	int i;

	#define THRM1_TIN (1 << 31)
	#define THRM1_TIV (1 << 30)
	#define THRM1_THRES(x) (((x) & 0x7f) << 23)
	#define THRM1_TID (1 << 2)
	#define THRM1_TIE (1 << 1)
	#define THRM1_V (1 << 0)
	#define THRM3_E (1 << 0)

	if (!(env->spr[SPR_THRM3] & THRM3_E)) {
	return;
	}

	/* Note: Thermal interrupts are unimplemented */
	for (i = SPR_THRM1; i <= SPR_THRM2; i++) {
	v = env->spr[i];
	if (!(v & THRM1_V)) {
	continue;
	}
	v \|= THRM1_TIV;
	v &= ~THRM1_TIN;
	t = v & THRM1_THRES(127);
	if ((v & THRM1_TID) && t < THRM1_THRES(24)) {
	v \|= THRM1_TIN;
	}
	if (!(v & THRM1_TID) && t > THRM1_THRES(24)) {
	v \|= THRM1_TIN;
	}
	env->spr[i] = v;
	}
	}