target/alpha/cpu.c - qemu - Git at Google

 /*
  * QEMU Alpha CPU
  *
  * Copyright (c) 2007 Jocelyn Mayer
  * Copyright (c) 2012 SUSE LINUX Products GmbH
  *
  * 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/lgpl-2.1.html>
  */

 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "qemu/qemu-print.h"
 #include "cpu.h"
 #include "exec/exec-all.h"
 #include "fpu/softfloat.h"


 static void alpha_cpu_set_pc(CPUState *cs, vaddr value)
 {
     CPUAlphaState *env = cpu_env(cs);
     env->pc = value;
 }

 static vaddr alpha_cpu_get_pc(CPUState *cs)
 {
     CPUAlphaState *env = cpu_env(cs);
     return env->pc;
 }

 static void alpha_cpu_synchronize_from_tb(CPUState *cs,
                                           const TranslationBlock *tb)
 {
     /* The program counter is always up to date with CF_PCREL. */
     if (!(tb_cflags(tb) & CF_PCREL)) {
         CPUAlphaState *env = cpu_env(cs);
         env->pc = tb->pc;
     }
 }

 static void alpha_restore_state_to_opc(CPUState *cs,
                                        const TranslationBlock *tb,
                                        const uint64_t *data)
 {
     CPUAlphaState *env = cpu_env(cs);

     if (tb_cflags(tb) & CF_PCREL) {
         env->pc = (env->pc & TARGET_PAGE_MASK) | data[0];
     } else {
         env->pc = data[0];
     }
 }

 static bool alpha_cpu_has_work(CPUState *cs)
 {
     /* Here we are checking to see if the CPU should wake up from HALT.
        We will have gotten into this state only for WTINT from PALmode.  */
     /* ??? I'm not sure how the IPL state works with WTINT to keep a CPU
        asleep even if (some) interrupts have been asserted.  For now,
        assume that if a CPU really wants to stay asleep, it will mask
        interrupts at the chipset level, which will prevent these bits
        from being set in the first place.  */
     return cs->interrupt_request & (CPU_INTERRUPT_HARD
                                     | CPU_INTERRUPT_TIMER
                                     | CPU_INTERRUPT_SMP
                                     | CPU_INTERRUPT_MCHK);
 }

 static int alpha_cpu_mmu_index(CPUState *cs, bool ifetch)
 {
     return alpha_env_mmu_index(cpu_env(cs));
 }

 static void alpha_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
 {
     info->mach = bfd_mach_alpha_ev6;
     info->print_insn = print_insn_alpha;
 }

 static void alpha_cpu_realizefn(DeviceState *dev, Error **errp)
 {
     CPUState *cs = CPU(dev);
     AlphaCPUClass *acc = ALPHA_CPU_GET_CLASS(dev);
     Error *local_err = NULL;

 #ifndef CONFIG_USER_ONLY
     /* Use pc-relative instructions in system-mode */
     cs->tcg_cflags |= CF_PCREL;
 #endif

     cpu_exec_realizefn(cs, &local_err);
     if (local_err != NULL) {
         error_propagate(errp, local_err);
         return;
     }

     qemu_init_vcpu(cs);

     acc->parent_realize(dev, errp);
 }

 /* Models */
 typedef struct AlphaCPUAlias {
     const char *alias;
     const char *typename;
 } AlphaCPUAlias;

 static const AlphaCPUAlias alpha_cpu_aliases[] = {
     { "21064",   ALPHA_CPU_TYPE_NAME("ev4") },
     { "21164",   ALPHA_CPU_TYPE_NAME("ev5") },
     { "21164a",  ALPHA_CPU_TYPE_NAME("ev56") },
     { "21164pc", ALPHA_CPU_TYPE_NAME("pca56") },
     { "21264",   ALPHA_CPU_TYPE_NAME("ev6") },
     { "21264a",  ALPHA_CPU_TYPE_NAME("ev67") },
 };

 static ObjectClass *alpha_cpu_class_by_name(const char *cpu_model)
 {
     ObjectClass *oc;
     char *typename;
     int i;

     oc = object_class_by_name(cpu_model);
     if (oc != NULL && object_class_dynamic_cast(oc, TYPE_ALPHA_CPU) != NULL) {
         return oc;
     }

     for (i = 0; i < ARRAY_SIZE(alpha_cpu_aliases); i++) {
         if (strcmp(cpu_model, alpha_cpu_aliases[i].alias) == 0) {
             oc = object_class_by_name(alpha_cpu_aliases[i].typename);
             assert(oc != NULL && !object_class_is_abstract(oc));
             return oc;
         }
     }

     typename = g_strdup_printf(ALPHA_CPU_TYPE_NAME("%s"), cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);

     return oc;
 }

 static void ev4_cpu_initfn(Object *obj)
 {
     cpu_env(CPU(obj))->implver = IMPLVER_2106x;
 }

 static void ev5_cpu_initfn(Object *obj)
 {
     cpu_env(CPU(obj))->implver = IMPLVER_21164;
 }

 static void ev56_cpu_initfn(Object *obj)
 {
     cpu_env(CPU(obj))->amask |= AMASK_BWX;
 }

 static void pca56_cpu_initfn(Object *obj)
 {
     cpu_env(CPU(obj))->amask |= AMASK_MVI;
 }

 static void ev6_cpu_initfn(Object *obj)
 {
     CPUAlphaState *env = cpu_env(CPU(obj));

     env->implver = IMPLVER_21264;
     env->amask = AMASK_BWX | AMASK_FIX | AMASK_MVI | AMASK_TRAP;
 }

 static void ev67_cpu_initfn(Object *obj)
 {
     cpu_env(CPU(obj))->amask |= AMASK_CIX | AMASK_PREFETCH;
 }

 static void alpha_cpu_initfn(Object *obj)
 {
     CPUAlphaState *env = cpu_env(CPU(obj));

     /* TODO all this should be done in reset, not init */

     env->lock_addr = -1;

     /*
      * TODO: this is incorrect. The Alpha Architecture Handbook version 4
      * describes NaN propagation in section 4.7.10.4. We should prefer
      * the operand in Fb (whether it is a QNaN or an SNaN), then the
      * operand in Fa. That is float_2nan_prop_ba.
      */
     set_float_2nan_prop_rule(float_2nan_prop_x87, &env->fp_status);
 #if defined(CONFIG_USER_ONLY)
     env->flags = ENV_FLAG_PS_USER | ENV_FLAG_FEN;
     cpu_alpha_store_fpcr(env, (uint64_t)(FPCR_INVD | FPCR_DZED | FPCR_OVFD
                                          | FPCR_UNFD | FPCR_INED | FPCR_DNOD
                                          | FPCR_DYN_NORMAL) << 32);
 #else
     env->flags = ENV_FLAG_PAL_MODE | ENV_FLAG_FEN;
 #endif
 }

 #ifndef CONFIG_USER_ONLY
 #include "hw/core/sysemu-cpu-ops.h"

 static const struct SysemuCPUOps alpha_sysemu_ops = {
     .get_phys_page_debug = alpha_cpu_get_phys_page_debug,
 };
 #endif

 #include "hw/core/tcg-cpu-ops.h"

 static const TCGCPUOps alpha_tcg_ops = {
     .initialize = alpha_translate_init,
     .synchronize_from_tb = alpha_cpu_synchronize_from_tb,
     .restore_state_to_opc = alpha_restore_state_to_opc,

 #ifdef CONFIG_USER_ONLY
     .record_sigsegv = alpha_cpu_record_sigsegv,
     .record_sigbus = alpha_cpu_record_sigbus,
 #else
     .tlb_fill = alpha_cpu_tlb_fill,
     .cpu_exec_interrupt = alpha_cpu_exec_interrupt,
     .cpu_exec_halt = alpha_cpu_has_work,
     .do_interrupt = alpha_cpu_do_interrupt,
     .do_transaction_failed = alpha_cpu_do_transaction_failed,
     .do_unaligned_access = alpha_cpu_do_unaligned_access,
 #endif /* !CONFIG_USER_ONLY */
 };

 static void alpha_cpu_class_init(ObjectClass *oc, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(oc);
     CPUClass *cc = CPU_CLASS(oc);
     AlphaCPUClass *acc = ALPHA_CPU_CLASS(oc);

     device_class_set_parent_realize(dc, alpha_cpu_realizefn,
                                     &acc->parent_realize);

     cc->class_by_name = alpha_cpu_class_by_name;
     cc->has_work = alpha_cpu_has_work;
     cc->mmu_index = alpha_cpu_mmu_index;
     cc->dump_state = alpha_cpu_dump_state;
     cc->set_pc = alpha_cpu_set_pc;
     cc->get_pc = alpha_cpu_get_pc;
     cc->gdb_read_register = alpha_cpu_gdb_read_register;
     cc->gdb_write_register = alpha_cpu_gdb_write_register;
 #ifndef CONFIG_USER_ONLY
     dc->vmsd = &vmstate_alpha_cpu;
     cc->sysemu_ops = &alpha_sysemu_ops;
 #endif
     cc->disas_set_info = alpha_cpu_disas_set_info;

     cc->tcg_ops = &alpha_tcg_ops;
     cc->gdb_num_core_regs = 67;
 }

 #define DEFINE_ALPHA_CPU_TYPE(base_type, cpu_model, initfn) \
      {                                                      \
          .parent = base_type,                               \
          .instance_init = initfn,                           \
          .name = ALPHA_CPU_TYPE_NAME(cpu_model),            \
      }

 static const TypeInfo alpha_cpu_type_infos[] = {
     {
         .name = TYPE_ALPHA_CPU,
         .parent = TYPE_CPU,
         .instance_size = sizeof(AlphaCPU),
         .instance_align = __alignof(AlphaCPU),
         .instance_init = alpha_cpu_initfn,
         .abstract = true,
         .class_size = sizeof(AlphaCPUClass),
         .class_init = alpha_cpu_class_init,
     },
     DEFINE_ALPHA_CPU_TYPE(TYPE_ALPHA_CPU, "ev4", ev4_cpu_initfn),
     DEFINE_ALPHA_CPU_TYPE(TYPE_ALPHA_CPU, "ev5", ev5_cpu_initfn),
     DEFINE_ALPHA_CPU_TYPE(ALPHA_CPU_TYPE_NAME("ev5"), "ev56", ev56_cpu_initfn),
     DEFINE_ALPHA_CPU_TYPE(ALPHA_CPU_TYPE_NAME("ev56"), "pca56",
                           pca56_cpu_initfn),
     DEFINE_ALPHA_CPU_TYPE(TYPE_ALPHA_CPU, "ev6", ev6_cpu_initfn),
     DEFINE_ALPHA_CPU_TYPE(ALPHA_CPU_TYPE_NAME("ev6"), "ev67", ev67_cpu_initfn),
     DEFINE_ALPHA_CPU_TYPE(ALPHA_CPU_TYPE_NAME("ev67"), "ev68", NULL),
 };

 DEFINE_TYPES(alpha_cpu_type_infos)
	/*
	* QEMU Alpha CPU
	*
	* Copyright (c) 2007 Jocelyn Mayer
	* Copyright (c) 2012 SUSE LINUX Products GmbH
	*
	* 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/lgpl-2.1.html>
	*/

	#include "qemu/osdep.h"
	#include "qapi/error.h"
	#include "qemu/qemu-print.h"
	#include "cpu.h"
	#include "exec/exec-all.h"
	#include "fpu/softfloat.h"


	static void alpha_cpu_set_pc(CPUState *cs, vaddr value)
	{
	CPUAlphaState *env = cpu_env(cs);
	env->pc = value;
	}

	static vaddr alpha_cpu_get_pc(CPUState *cs)
	{
	CPUAlphaState *env = cpu_env(cs);
	return env->pc;
	}

	static void alpha_cpu_synchronize_from_tb(CPUState *cs,
	const TranslationBlock *tb)
	{
	/* The program counter is always up to date with CF_PCREL. */
	if (!(tb_cflags(tb) & CF_PCREL)) {
	CPUAlphaState *env = cpu_env(cs);
	env->pc = tb->pc;
	}
	}

	static void alpha_restore_state_to_opc(CPUState *cs,
	const TranslationBlock *tb,
	const uint64_t *data)
	{
	CPUAlphaState *env = cpu_env(cs);

	if (tb_cflags(tb) & CF_PCREL) {
	env->pc = (env->pc & TARGET_PAGE_MASK) \| data[0];
	} else {
	env->pc = data[0];
	}
	}

	static bool alpha_cpu_has_work(CPUState *cs)
	{
	/* Here we are checking to see if the CPU should wake up from HALT.
	We will have gotten into this state only for WTINT from PALmode. */
	/* ??? I'm not sure how the IPL state works with WTINT to keep a CPU
	asleep even if (some) interrupts have been asserted. For now,
	assume that if a CPU really wants to stay asleep, it will mask
	interrupts at the chipset level, which will prevent these bits
	from being set in the first place. */
	return cs->interrupt_request & (CPU_INTERRUPT_HARD
	\| CPU_INTERRUPT_TIMER
	\| CPU_INTERRUPT_SMP
	\| CPU_INTERRUPT_MCHK);
	}

	static int alpha_cpu_mmu_index(CPUState *cs, bool ifetch)
	{
	return alpha_env_mmu_index(cpu_env(cs));
	}

	static void alpha_cpu_disas_set_info(CPUState cpu, disassemble_info info)
	{
	info->mach = bfd_mach_alpha_ev6;
	info->print_insn = print_insn_alpha;
	}

	static void alpha_cpu_realizefn(DeviceState dev, Error *errp)
	{
	CPUState *cs = CPU(dev);
	AlphaCPUClass *acc = ALPHA_CPU_GET_CLASS(dev);
	Error *local_err = NULL;

	#ifndef CONFIG_USER_ONLY
	/* Use pc-relative instructions in system-mode */
	cs->tcg_cflags \|= CF_PCREL;
	#endif

	cpu_exec_realizefn(cs, &local_err);
	if (local_err != NULL) {
	error_propagate(errp, local_err);
	return;
	}

	qemu_init_vcpu(cs);

	acc->parent_realize(dev, errp);
	}

	/* Models */
	typedef struct AlphaCPUAlias {
	const char *alias;
	const char *typename;
	} AlphaCPUAlias;

	static const AlphaCPUAlias alpha_cpu_aliases[] = {
	{ "21064", ALPHA_CPU_TYPE_NAME("ev4") },
	{ "21164", ALPHA_CPU_TYPE_NAME("ev5") },
	{ "21164a", ALPHA_CPU_TYPE_NAME("ev56") },
	{ "21164pc", ALPHA_CPU_TYPE_NAME("pca56") },
	{ "21264", ALPHA_CPU_TYPE_NAME("ev6") },
	{ "21264a", ALPHA_CPU_TYPE_NAME("ev67") },
	};

	static ObjectClass alpha_cpu_class_by_name(const char cpu_model)
	{
	ObjectClass *oc;
	char *typename;
	int i;

	oc = object_class_by_name(cpu_model);
	if (oc != NULL && object_class_dynamic_cast(oc, TYPE_ALPHA_CPU) != NULL) {
	return oc;
	}

	for (i = 0; i < ARRAY_SIZE(alpha_cpu_aliases); i++) {
	if (strcmp(cpu_model, alpha_cpu_aliases[i].alias) == 0) {
	oc = object_class_by_name(alpha_cpu_aliases[i].typename);
	assert(oc != NULL && !object_class_is_abstract(oc));
	return oc;
	}
	}

	typename = g_strdup_printf(ALPHA_CPU_TYPE_NAME("%s"), cpu_model);
	oc = object_class_by_name(typename);
	g_free(typename);

	return oc;
	}

	static void ev4_cpu_initfn(Object *obj)
	{
	cpu_env(CPU(obj))->implver = IMPLVER_2106x;
	}

	static void ev5_cpu_initfn(Object *obj)
	{
	cpu_env(CPU(obj))->implver = IMPLVER_21164;
	}

	static void ev56_cpu_initfn(Object *obj)
	{
	cpu_env(CPU(obj))->amask \|= AMASK_BWX;
	}

	static void pca56_cpu_initfn(Object *obj)
	{
	cpu_env(CPU(obj))->amask \|= AMASK_MVI;
	}

	static void ev6_cpu_initfn(Object *obj)
	{
	CPUAlphaState *env = cpu_env(CPU(obj));

	env->implver = IMPLVER_21264;
	env->amask = AMASK_BWX \| AMASK_FIX \| AMASK_MVI \| AMASK_TRAP;
	}

	static void ev67_cpu_initfn(Object *obj)
	{
	cpu_env(CPU(obj))->amask \|= AMASK_CIX \| AMASK_PREFETCH;
	}

	static void alpha_cpu_initfn(Object *obj)
	{
	CPUAlphaState *env = cpu_env(CPU(obj));

	/* TODO all this should be done in reset, not init */

	env->lock_addr = -1;

	/*
	* TODO: this is incorrect. The Alpha Architecture Handbook version 4
	* describes NaN propagation in section 4.7.10.4. We should prefer
	* the operand in Fb (whether it is a QNaN or an SNaN), then the
	* operand in Fa. That is float_2nan_prop_ba.
	*/
	set_float_2nan_prop_rule(float_2nan_prop_x87, &env->fp_status);
	#if defined(CONFIG_USER_ONLY)
	env->flags = ENV_FLAG_PS_USER \| ENV_FLAG_FEN;
	cpu_alpha_store_fpcr(env, (uint64_t)(FPCR_INVD \| FPCR_DZED \| FPCR_OVFD
	\| FPCR_UNFD \| FPCR_INED \| FPCR_DNOD
	\| FPCR_DYN_NORMAL) << 32);
	#else
	env->flags = ENV_FLAG_PAL_MODE \| ENV_FLAG_FEN;
	#endif
	}

	#ifndef CONFIG_USER_ONLY
	#include "hw/core/sysemu-cpu-ops.h"

	static const struct SysemuCPUOps alpha_sysemu_ops = {
	.get_phys_page_debug = alpha_cpu_get_phys_page_debug,
	};
	#endif

	#include "hw/core/tcg-cpu-ops.h"

	static const TCGCPUOps alpha_tcg_ops = {
	.initialize = alpha_translate_init,
	.synchronize_from_tb = alpha_cpu_synchronize_from_tb,
	.restore_state_to_opc = alpha_restore_state_to_opc,

	#ifdef CONFIG_USER_ONLY
	.record_sigsegv = alpha_cpu_record_sigsegv,
	.record_sigbus = alpha_cpu_record_sigbus,
	#else
	.tlb_fill = alpha_cpu_tlb_fill,
	.cpu_exec_interrupt = alpha_cpu_exec_interrupt,
	.cpu_exec_halt = alpha_cpu_has_work,
	.do_interrupt = alpha_cpu_do_interrupt,
	.do_transaction_failed = alpha_cpu_do_transaction_failed,
	.do_unaligned_access = alpha_cpu_do_unaligned_access,
	#endif /* !CONFIG_USER_ONLY */
	};

	static void alpha_cpu_class_init(ObjectClass oc, void data)
	{
	DeviceClass *dc = DEVICE_CLASS(oc);
	CPUClass *cc = CPU_CLASS(oc);
	AlphaCPUClass *acc = ALPHA_CPU_CLASS(oc);

	device_class_set_parent_realize(dc, alpha_cpu_realizefn,
	&acc->parent_realize);

	cc->class_by_name = alpha_cpu_class_by_name;
	cc->has_work = alpha_cpu_has_work;
	cc->mmu_index = alpha_cpu_mmu_index;
	cc->dump_state = alpha_cpu_dump_state;
	cc->set_pc = alpha_cpu_set_pc;
	cc->get_pc = alpha_cpu_get_pc;
	cc->gdb_read_register = alpha_cpu_gdb_read_register;
	cc->gdb_write_register = alpha_cpu_gdb_write_register;
	#ifndef CONFIG_USER_ONLY
	dc->vmsd = &vmstate_alpha_cpu;
	cc->sysemu_ops = &alpha_sysemu_ops;
	#endif
	cc->disas_set_info = alpha_cpu_disas_set_info;

	cc->tcg_ops = &alpha_tcg_ops;
	cc->gdb_num_core_regs = 67;
	}

	#define DEFINE_ALPHA_CPU_TYPE(base_type, cpu_model, initfn) \
	{ \
	.parent = base_type, \
	.instance_init = initfn, \
	.name = ALPHA_CPU_TYPE_NAME(cpu_model), \
	}

	static const TypeInfo alpha_cpu_type_infos[] = {
	{
	.name = TYPE_ALPHA_CPU,
	.parent = TYPE_CPU,
	.instance_size = sizeof(AlphaCPU),
	.instance_align = __alignof(AlphaCPU),
	.instance_init = alpha_cpu_initfn,
	.abstract = true,
	.class_size = sizeof(AlphaCPUClass),
	.class_init = alpha_cpu_class_init,
	},
	DEFINE_ALPHA_CPU_TYPE(TYPE_ALPHA_CPU, "ev4", ev4_cpu_initfn),
	DEFINE_ALPHA_CPU_TYPE(TYPE_ALPHA_CPU, "ev5", ev5_cpu_initfn),
	DEFINE_ALPHA_CPU_TYPE(ALPHA_CPU_TYPE_NAME("ev5"), "ev56", ev56_cpu_initfn),
	DEFINE_ALPHA_CPU_TYPE(ALPHA_CPU_TYPE_NAME("ev56"), "pca56",
	pca56_cpu_initfn),
	DEFINE_ALPHA_CPU_TYPE(TYPE_ALPHA_CPU, "ev6", ev6_cpu_initfn),
	DEFINE_ALPHA_CPU_TYPE(ALPHA_CPU_TYPE_NAME("ev6"), "ev67", ev67_cpu_initfn),
	DEFINE_ALPHA_CPU_TYPE(ALPHA_CPU_TYPE_NAME("ev67"), "ev68", NULL),
	};

	DEFINE_TYPES(alpha_cpu_type_infos)