target/hppa/cpu.h - qemu - Git at Google

 /*
  * PA-RISC emulation cpu definitions for qemu.
  *
  * Copyright (c) 2016 Richard Henderson <rth@twiddle.net>
  *
  * 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/>.
  */

 #ifndef HPPA_CPU_H
 #define HPPA_CPU_H

 #include "qemu-common.h"
 #include "cpu-qom.h"

 #ifdef TARGET_HPPA64
 #define TARGET_LONG_BITS            64
 #define TARGET_VIRT_ADDR_SPACE_BITS 64
 #define TARGET_REGISTER_BITS        64
 #define TARGET_PHYS_ADDR_SPACE_BITS 64
 #elif defined(CONFIG_USER_ONLY)
 #define TARGET_LONG_BITS            32
 #define TARGET_VIRT_ADDR_SPACE_BITS 32
 #define TARGET_REGISTER_BITS        32
 #define TARGET_PHYS_ADDR_SPACE_BITS 32
 #else
 /* In order to form the GVA from space:offset,
    we need a 64-bit virtual address space.  */
 #define TARGET_LONG_BITS            64
 #define TARGET_VIRT_ADDR_SPACE_BITS 64
 #define TARGET_REGISTER_BITS        32
 #define TARGET_PHYS_ADDR_SPACE_BITS 32
 #endif

 /* PA-RISC 1.x processors have a strong memory model.  */
 /* ??? While we do not yet implement PA-RISC 2.0, those processors have
    a weak memory model, but with TLB bits that force ordering on a per-page
    basis.  It's probably easier to fall back to a strong memory model.  */
 #define TCG_GUEST_DEFAULT_MO        TCG_MO_ALL

 #define CPUArchState struct CPUHPPAState

 #include "exec/cpu-defs.h"

 #define TARGET_PAGE_BITS 12

 #define ALIGNED_ONLY
 #define NB_MMU_MODES     5
 #define MMU_KERNEL_IDX   0
 #define MMU_USER_IDX     3
 #define MMU_PHYS_IDX     4
 #define TARGET_INSN_START_EXTRA_WORDS 1

 /* Hardware exceptions, interupts, faults, and traps.  */
 #define EXCP_HPMC                1  /* high priority machine check */
 #define EXCP_POWER_FAIL          2
 #define EXCP_RC                  3  /* recovery counter */
 #define EXCP_EXT_INTERRUPT       4  /* external interrupt */
 #define EXCP_LPMC                5  /* low priority machine check */
 #define EXCP_ITLB_MISS           6  /* itlb miss / instruction page fault */
 #define EXCP_IMP                 7  /* instruction memory protection trap */
 #define EXCP_ILL                 8  /* illegal instruction trap */
 #define EXCP_BREAK               9  /* break instruction */
 #define EXCP_PRIV_OPR            10 /* privileged operation trap */
 #define EXCP_PRIV_REG            11 /* privileged register trap */
 #define EXCP_OVERFLOW            12 /* signed overflow trap */
 #define EXCP_COND                13 /* trap-on-condition */
 #define EXCP_ASSIST              14 /* assist exception trap */
 #define EXCP_DTLB_MISS           15 /* dtlb miss / data page fault */
 #define EXCP_NA_ITLB_MISS        16 /* non-access itlb miss */
 #define EXCP_NA_DTLB_MISS        17 /* non-access dtlb miss */
 #define EXCP_DMP                 18 /* data memory protection trap */
 #define EXCP_DMB                 19 /* data memory break trap */
 #define EXCP_TLB_DIRTY           20 /* tlb dirty bit trap */
 #define EXCP_PAGE_REF            21 /* page reference trap */
 #define EXCP_ASSIST_EMU          22 /* assist emulation trap */
 #define EXCP_HPT                 23 /* high-privilege transfer trap */
 #define EXCP_LPT                 24 /* low-privilege transfer trap */
 #define EXCP_TB                  25 /* taken branch trap */
 #define EXCP_DMAR                26 /* data memory access rights trap */
 #define EXCP_DMPI                27 /* data memory protection id trap */
 #define EXCP_UNALIGN             28 /* unaligned data reference trap */
 #define EXCP_PER_INTERRUPT       29 /* performance monitor interrupt */

 /* Exceptions for linux-user emulation.  */
 #define EXCP_SYSCALL             30
 #define EXCP_SYSCALL_LWS         31

 /* Taken from Linux kernel: arch/parisc/include/asm/psw.h */
 #define PSW_I            0x00000001
 #define PSW_D            0x00000002
 #define PSW_P            0x00000004
 #define PSW_Q            0x00000008
 #define PSW_R            0x00000010
 #define PSW_F            0x00000020
 #define PSW_G            0x00000040 /* PA1.x only */
 #define PSW_O            0x00000080 /* PA2.0 only */
 #define PSW_CB           0x0000ff00
 #define PSW_M            0x00010000
 #define PSW_V            0x00020000
 #define PSW_C            0x00040000
 #define PSW_B            0x00080000
 #define PSW_X            0x00100000
 #define PSW_N            0x00200000
 #define PSW_L            0x00400000
 #define PSW_H            0x00800000
 #define PSW_T            0x01000000
 #define PSW_S            0x02000000
 #define PSW_E            0x04000000
 #ifdef TARGET_HPPA64
 #define PSW_W            0x08000000 /* PA2.0 only */
 #else
 #define PSW_W            0
 #endif
 #define PSW_Z            0x40000000 /* PA1.x only */
 #define PSW_Y            0x80000000 /* PA1.x only */

 #define PSW_SM (PSW_W | PSW_E | PSW_O | PSW_G | PSW_F \
                | PSW_R | PSW_Q | PSW_P | PSW_D | PSW_I)

 /* ssm/rsm instructions number PSW_W and PSW_E differently */
 #define PSW_SM_I         PSW_I      /* Enable External Interrupts */
 #define PSW_SM_D         PSW_D
 #define PSW_SM_P         PSW_P
 #define PSW_SM_Q         PSW_Q      /* Enable Interrupt State Collection */
 #define PSW_SM_R         PSW_R      /* Enable Recover Counter Trap */
 #ifdef TARGET_HPPA64
 #define PSW_SM_E         0x100
 #define PSW_SM_W         0x200      /* PA2.0 only : Enable Wide Mode */
 #else
 #define PSW_SM_E         0
 #define PSW_SM_W         0
 #endif

 #define CR_RC            0
 #define CR_SCRCCR        10
 #define CR_SAR           11
 #define CR_IVA           14
 #define CR_EIEM          15
 #define CR_IT            16
 #define CR_IIASQ         17
 #define CR_IIAOQ         18
 #define CR_IIR           19
 #define CR_ISR           20
 #define CR_IOR           21
 #define CR_IPSW          22
 #define CR_EIRR          23

 typedef struct CPUHPPAState CPUHPPAState;

 #if TARGET_REGISTER_BITS == 32
 typedef uint32_t target_ureg;
 typedef int32_t  target_sreg;
 #define TREG_FMT_lx   "%08"PRIx32
 #define TREG_FMT_ld   "%"PRId32
 #else
 typedef uint64_t target_ureg;
 typedef int64_t  target_sreg;
 #define TREG_FMT_lx   "%016"PRIx64
 #define TREG_FMT_ld   "%"PRId64
 #endif

 typedef struct {
     uint64_t va_b;
     uint64_t va_e;
     target_ureg pa;
     unsigned u : 1;
     unsigned t : 1;
     unsigned d : 1;
     unsigned b : 1;
     unsigned page_size : 4;
     unsigned ar_type : 3;
     unsigned ar_pl1 : 2;
     unsigned ar_pl2 : 2;
     unsigned entry_valid : 1;
     unsigned access_id : 16;
 } hppa_tlb_entry;

 struct CPUHPPAState {
     target_ureg gr[32];
     uint64_t fr[32];
     uint64_t sr[8];          /* stored shifted into place for gva */

     target_ureg psw;         /* All psw bits except the following:  */
     target_ureg psw_n;       /* boolean */
     target_sreg psw_v;       /* in most significant bit */

     /* Splitting the carry-borrow field into the MSB and "the rest", allows
      * for "the rest" to be deleted when it is unused, but the MSB is in use.
      * In addition, it's easier to compute carry-in for bit B+1 than it is to
      * compute carry-out for bit B (3 vs 4 insns for addition, assuming the
      * host has the appropriate add-with-carry insn to compute the msb).
      * Therefore the carry bits are stored as: cb_msb : cb & 0x11111110.
      */
     target_ureg psw_cb;      /* in least significant bit of next nibble */
     target_ureg psw_cb_msb;  /* boolean */

     target_ureg iaoq_f;      /* front */
     target_ureg iaoq_b;      /* back, aka next instruction */
     uint64_t iasq_f;
     uint64_t iasq_b;

     uint32_t fr0_shadow;     /* flags, c, ca/cq, rm, d, enables */
     float_status fp_status;

     target_ureg cr[32];      /* control registers */
     target_ureg cr_back[2];  /* back of cr17/cr18 */
     target_ureg shadow[7];   /* shadow registers */

     /* Those resources are used only in QEMU core */
     CPU_COMMON

     /* ??? The number of entries isn't specified by the architecture.  */
     /* ??? Implement a unified itlb/dtlb for the moment.  */
     /* ??? We should use a more intelligent data structure.  */
     hppa_tlb_entry tlb[256];
     uint32_t tlb_last;
 };

 /**
  * HPPACPU:
  * @env: #CPUHPPAState
  *
  * An HPPA CPU.
  */
 struct HPPACPU {
     /*< private >*/
     CPUState parent_obj;
     /*< public >*/

     CPUHPPAState env;
     QEMUTimer *alarm_timer;
 };

 static inline HPPACPU *hppa_env_get_cpu(CPUHPPAState *env)
 {
     return container_of(env, HPPACPU, env);
 }

 #define ENV_GET_CPU(e)  CPU(hppa_env_get_cpu(e))
 #define ENV_OFFSET      offsetof(HPPACPU, env)

 #include "exec/cpu-all.h"

 static inline int cpu_mmu_index(CPUHPPAState *env, bool ifetch)
 {
 #ifdef CONFIG_USER_ONLY
     return MMU_USER_IDX;
 #else
     if (env->psw & (ifetch ? PSW_C : PSW_D)) {
         return env->iaoq_f & 3;
     }
     return MMU_PHYS_IDX;  /* mmu disabled */
 #endif
 }

 void hppa_translate_init(void);

 #define CPU_RESOLVING_TYPE TYPE_HPPA_CPU

 void hppa_cpu_list(FILE *f, fprintf_function cpu_fprintf);

 static inline target_ulong hppa_form_gva_psw(target_ureg psw, uint64_t spc,
                                              target_ureg off)
 {
 #ifdef CONFIG_USER_ONLY
     return off;
 #else
     off &= (psw & PSW_W ? 0x3fffffffffffffffull : 0xffffffffull);
     return spc | off;
 #endif
 }

 static inline target_ulong hppa_form_gva(CPUHPPAState *env, uint64_t spc,
                                          target_ureg off)
 {
     return hppa_form_gva_psw(env->psw, spc, off);
 }

 /* Since PSW_{I,CB} will never need to be in tb->flags, reuse them.
  * TB_FLAG_SR_SAME indicates that SR4 through SR7 all contain the
  * same value.
  */
 #define TB_FLAG_SR_SAME     PSW_I
 #define TB_FLAG_PRIV_SHIFT  8

 static inline void cpu_get_tb_cpu_state(CPUHPPAState *env, target_ulong *pc,
                                         target_ulong *cs_base,
                                         uint32_t *pflags)
 {
     uint32_t flags = env->psw_n * PSW_N;

     /* TB lookup assumes that PC contains the complete virtual address.
        If we leave space+offset separate, we'll get ITLB misses to an
        incomplete virtual address.  This also means that we must separate
        out current cpu priviledge from the low bits of IAOQ_F.  */
 #ifdef CONFIG_USER_ONLY
     *pc = env->iaoq_f & -4;
     *cs_base = env->iaoq_b & -4;
 #else
     /* ??? E, T, H, L, B, P bits need to be here, when implemented.  */
     flags |= env->psw & (PSW_W | PSW_C | PSW_D);
     flags |= (env->iaoq_f & 3) << TB_FLAG_PRIV_SHIFT;

     *pc = (env->psw & PSW_C
            ? hppa_form_gva_psw(env->psw, env->iasq_f, env->iaoq_f & -4)
            : env->iaoq_f & -4);
     *cs_base = env->iasq_f;

     /* Insert a difference between IAOQ_B and IAOQ_F within the otherwise zero
        low 32-bits of CS_BASE.  This will succeed for all direct branches,
        which is the primary case we care about -- using goto_tb within a page.
        Failure is indicated by a zero difference.  */
     if (env->iasq_f == env->iasq_b) {
         target_sreg diff = env->iaoq_b - env->iaoq_f;
         if (TARGET_REGISTER_BITS == 32 || diff == (int32_t)diff) {
             *cs_base |= (uint32_t)diff;
         }
     }
     if ((env->sr[4] == env->sr[5])
         & (env->sr[4] == env->sr[6])
         & (env->sr[4] == env->sr[7])) {
         flags |= TB_FLAG_SR_SAME;
     }
 #endif

     *pflags = flags;
 }

 target_ureg cpu_hppa_get_psw(CPUHPPAState *env);
 void cpu_hppa_put_psw(CPUHPPAState *env, target_ureg);
 void cpu_hppa_loaded_fr0(CPUHPPAState *env);

 #define cpu_signal_handler cpu_hppa_signal_handler

 int cpu_hppa_signal_handler(int host_signum, void *pinfo, void *puc);
 hwaddr hppa_cpu_get_phys_page_debug(CPUState *cs, vaddr addr);
 int hppa_cpu_gdb_read_register(CPUState *cpu, uint8_t *buf, int reg);
 int hppa_cpu_gdb_write_register(CPUState *cpu, uint8_t *buf, int reg);
 void hppa_cpu_do_interrupt(CPUState *cpu);
 bool hppa_cpu_exec_interrupt(CPUState *cpu, int int_req);
 void hppa_cpu_dump_state(CPUState *cs, FILE *f, fprintf_function, int);
 #ifdef CONFIG_USER_ONLY
 int hppa_cpu_handle_mmu_fault(CPUState *cpu, vaddr address, int size,
                               int rw, int midx);
 #else
 int hppa_get_physical_address(CPUHPPAState *env, vaddr addr, int mmu_idx,
                               int type, hwaddr *pphys, int *pprot);
 extern const MemoryRegionOps hppa_io_eir_ops;
 extern const struct VMStateDescription vmstate_hppa_cpu;
 void hppa_cpu_alarm_timer(void *);
 int hppa_artype_for_page(CPUHPPAState *env, target_ulong vaddr);
 #endif
 void QEMU_NORETURN hppa_dynamic_excp(CPUHPPAState *env, int excp, uintptr_t ra);

 #endif /* HPPA_CPU_H */
	/*
	* PA-RISC emulation cpu definitions for qemu.
	*
	* Copyright (c) 2016 Richard Henderson <rth@twiddle.net>
	*
	* 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/>.
	*/

	#ifndef HPPA_CPU_H
	#define HPPA_CPU_H

	#include "qemu-common.h"
	#include "cpu-qom.h"

	#ifdef TARGET_HPPA64
	#define TARGET_LONG_BITS 64
	#define TARGET_VIRT_ADDR_SPACE_BITS 64
	#define TARGET_REGISTER_BITS 64
	#define TARGET_PHYS_ADDR_SPACE_BITS 64
	#elif defined(CONFIG_USER_ONLY)
	#define TARGET_LONG_BITS 32
	#define TARGET_VIRT_ADDR_SPACE_BITS 32
	#define TARGET_REGISTER_BITS 32
	#define TARGET_PHYS_ADDR_SPACE_BITS 32
	#else
	/* In order to form the GVA from space:offset,
	we need a 64-bit virtual address space. */
	#define TARGET_LONG_BITS 64
	#define TARGET_VIRT_ADDR_SPACE_BITS 64
	#define TARGET_REGISTER_BITS 32
	#define TARGET_PHYS_ADDR_SPACE_BITS 32
	#endif

	/* PA-RISC 1.x processors have a strong memory model. */
	/* ??? While we do not yet implement PA-RISC 2.0, those processors have
	a weak memory model, but with TLB bits that force ordering on a per-page
	basis. It's probably easier to fall back to a strong memory model. */
	#define TCG_GUEST_DEFAULT_MO TCG_MO_ALL

	#define CPUArchState struct CPUHPPAState

	#include "exec/cpu-defs.h"

	#define TARGET_PAGE_BITS 12

	#define ALIGNED_ONLY
	#define NB_MMU_MODES 5
	#define MMU_KERNEL_IDX 0
	#define MMU_USER_IDX 3
	#define MMU_PHYS_IDX 4
	#define TARGET_INSN_START_EXTRA_WORDS 1

	/* Hardware exceptions, interupts, faults, and traps. */
	#define EXCP_HPMC 1 /* high priority machine check */
	#define EXCP_POWER_FAIL 2
	#define EXCP_RC 3 /* recovery counter */
	#define EXCP_EXT_INTERRUPT 4 /* external interrupt */
	#define EXCP_LPMC 5 /* low priority machine check */
	#define EXCP_ITLB_MISS 6 /* itlb miss / instruction page fault */
	#define EXCP_IMP 7 /* instruction memory protection trap */
	#define EXCP_ILL 8 /* illegal instruction trap */
	#define EXCP_BREAK 9 /* break instruction */
	#define EXCP_PRIV_OPR 10 /* privileged operation trap */
	#define EXCP_PRIV_REG 11 /* privileged register trap */
	#define EXCP_OVERFLOW 12 /* signed overflow trap */
	#define EXCP_COND 13 /* trap-on-condition */
	#define EXCP_ASSIST 14 /* assist exception trap */
	#define EXCP_DTLB_MISS 15 /* dtlb miss / data page fault */
	#define EXCP_NA_ITLB_MISS 16 /* non-access itlb miss */
	#define EXCP_NA_DTLB_MISS 17 /* non-access dtlb miss */
	#define EXCP_DMP 18 /* data memory protection trap */
	#define EXCP_DMB 19 /* data memory break trap */
	#define EXCP_TLB_DIRTY 20 /* tlb dirty bit trap */
	#define EXCP_PAGE_REF 21 /* page reference trap */
	#define EXCP_ASSIST_EMU 22 /* assist emulation trap */
	#define EXCP_HPT 23 /* high-privilege transfer trap */
	#define EXCP_LPT 24 /* low-privilege transfer trap */
	#define EXCP_TB 25 /* taken branch trap */
	#define EXCP_DMAR 26 /* data memory access rights trap */
	#define EXCP_DMPI 27 /* data memory protection id trap */
	#define EXCP_UNALIGN 28 /* unaligned data reference trap */
	#define EXCP_PER_INTERRUPT 29 /* performance monitor interrupt */

	/* Exceptions for linux-user emulation. */
	#define EXCP_SYSCALL 30
	#define EXCP_SYSCALL_LWS 31

	/* Taken from Linux kernel: arch/parisc/include/asm/psw.h */
	#define PSW_I 0x00000001
	#define PSW_D 0x00000002
	#define PSW_P 0x00000004
	#define PSW_Q 0x00000008
	#define PSW_R 0x00000010
	#define PSW_F 0x00000020
	#define PSW_G 0x00000040 /* PA1.x only */
	#define PSW_O 0x00000080 /* PA2.0 only */
	#define PSW_CB 0x0000ff00
	#define PSW_M 0x00010000
	#define PSW_V 0x00020000
	#define PSW_C 0x00040000
	#define PSW_B 0x00080000
	#define PSW_X 0x00100000
	#define PSW_N 0x00200000
	#define PSW_L 0x00400000
	#define PSW_H 0x00800000
	#define PSW_T 0x01000000
	#define PSW_S 0x02000000
	#define PSW_E 0x04000000
	#ifdef TARGET_HPPA64
	#define PSW_W 0x08000000 /* PA2.0 only */
	#else
	#define PSW_W 0
	#endif
	#define PSW_Z 0x40000000 /* PA1.x only */
	#define PSW_Y 0x80000000 /* PA1.x only */

	#define PSW_SM (PSW_W \| PSW_E \| PSW_O \| PSW_G \| PSW_F \
	\| PSW_R \| PSW_Q \| PSW_P \| PSW_D \| PSW_I)

	/* ssm/rsm instructions number PSW_W and PSW_E differently */
	#define PSW_SM_I PSW_I /* Enable External Interrupts */
	#define PSW_SM_D PSW_D
	#define PSW_SM_P PSW_P
	#define PSW_SM_Q PSW_Q /* Enable Interrupt State Collection */
	#define PSW_SM_R PSW_R /* Enable Recover Counter Trap */
	#ifdef TARGET_HPPA64
	#define PSW_SM_E 0x100
	#define PSW_SM_W 0x200 /* PA2.0 only : Enable Wide Mode */
	#else
	#define PSW_SM_E 0
	#define PSW_SM_W 0
	#endif

	#define CR_RC 0
	#define CR_SCRCCR 10
	#define CR_SAR 11
	#define CR_IVA 14
	#define CR_EIEM 15
	#define CR_IT 16
	#define CR_IIASQ 17
	#define CR_IIAOQ 18
	#define CR_IIR 19
	#define CR_ISR 20
	#define CR_IOR 21
	#define CR_IPSW 22
	#define CR_EIRR 23

	typedef struct CPUHPPAState CPUHPPAState;

	#if TARGET_REGISTER_BITS == 32
	typedef uint32_t target_ureg;
	typedef int32_t target_sreg;
	#define TREG_FMT_lx "%08"PRIx32
	#define TREG_FMT_ld "%"PRId32
	#else
	typedef uint64_t target_ureg;
	typedef int64_t target_sreg;
	#define TREG_FMT_lx "%016"PRIx64
	#define TREG_FMT_ld "%"PRId64
	#endif

	typedef struct {
	uint64_t va_b;
	uint64_t va_e;
	target_ureg pa;
	unsigned u : 1;
	unsigned t : 1;
	unsigned d : 1;
	unsigned b : 1;
	unsigned page_size : 4;
	unsigned ar_type : 3;
	unsigned ar_pl1 : 2;
	unsigned ar_pl2 : 2;
	unsigned entry_valid : 1;
	unsigned access_id : 16;
	} hppa_tlb_entry;

	struct CPUHPPAState {
	target_ureg gr[32];
	uint64_t fr[32];
	uint64_t sr[8]; /* stored shifted into place for gva */

	target_ureg psw; /* All psw bits except the following: */
	target_ureg psw_n; /* boolean */
	target_sreg psw_v; /* in most significant bit */

	/* Splitting the carry-borrow field into the MSB and "the rest", allows
	* for "the rest" to be deleted when it is unused, but the MSB is in use.
	* In addition, it's easier to compute carry-in for bit B+1 than it is to
	* compute carry-out for bit B (3 vs 4 insns for addition, assuming the
	* host has the appropriate add-with-carry insn to compute the msb).
	* Therefore the carry bits are stored as: cb_msb : cb & 0x11111110.
	*/
	target_ureg psw_cb; /* in least significant bit of next nibble */
	target_ureg psw_cb_msb; /* boolean */

	target_ureg iaoq_f; /* front */
	target_ureg iaoq_b; /* back, aka next instruction */
	uint64_t iasq_f;
	uint64_t iasq_b;

	uint32_t fr0_shadow; /* flags, c, ca/cq, rm, d, enables */
	float_status fp_status;

	target_ureg cr[32]; /* control registers */
	target_ureg cr_back[2]; /* back of cr17/cr18 */
	target_ureg shadow[7]; /* shadow registers */

	/* Those resources are used only in QEMU core */
	CPU_COMMON

	/* ??? The number of entries isn't specified by the architecture. */
	/* ??? Implement a unified itlb/dtlb for the moment. */
	/* ??? We should use a more intelligent data structure. */
	hppa_tlb_entry tlb[256];
	uint32_t tlb_last;
	};

	/**
	* HPPACPU:
	* @env: #CPUHPPAState
	*
	* An HPPA CPU.
	*/
	struct HPPACPU {
	/< private >/
	CPUState parent_obj;
	/< public >/

	CPUHPPAState env;
	QEMUTimer *alarm_timer;
	};

	static inline HPPACPU hppa_env_get_cpu(CPUHPPAState env)
	{
	return container_of(env, HPPACPU, env);
	}

	#define ENV_GET_CPU(e) CPU(hppa_env_get_cpu(e))
	#define ENV_OFFSET offsetof(HPPACPU, env)

	#include "exec/cpu-all.h"

	static inline int cpu_mmu_index(CPUHPPAState *env, bool ifetch)
	{
	#ifdef CONFIG_USER_ONLY
	return MMU_USER_IDX;
	#else
	if (env->psw & (ifetch ? PSW_C : PSW_D)) {
	return env->iaoq_f & 3;
	}
	return MMU_PHYS_IDX; /* mmu disabled */
	#endif
	}

	void hppa_translate_init(void);

	#define CPU_RESOLVING_TYPE TYPE_HPPA_CPU

	void hppa_cpu_list(FILE *f, fprintf_function cpu_fprintf);

	static inline target_ulong hppa_form_gva_psw(target_ureg psw, uint64_t spc,
	target_ureg off)
	{
	#ifdef CONFIG_USER_ONLY
	return off;
	#else
	off &= (psw & PSW_W ? 0x3fffffffffffffffull : 0xffffffffull);
	return spc \| off;
	#endif
	}

	static inline target_ulong hppa_form_gva(CPUHPPAState *env, uint64_t spc,
	target_ureg off)
	{
	return hppa_form_gva_psw(env->psw, spc, off);
	}

	/* Since PSW_{I,CB} will never need to be in tb->flags, reuse them.
	* TB_FLAG_SR_SAME indicates that SR4 through SR7 all contain the
	* same value.
	*/
	#define TB_FLAG_SR_SAME PSW_I
	#define TB_FLAG_PRIV_SHIFT 8

	static inline void cpu_get_tb_cpu_state(CPUHPPAState env, target_ulong pc,
	target_ulong *cs_base,
	uint32_t *pflags)
	{
	uint32_t flags = env->psw_n * PSW_N;

	/* TB lookup assumes that PC contains the complete virtual address.
	If we leave space+offset separate, we'll get ITLB misses to an
	incomplete virtual address. This also means that we must separate
	out current cpu priviledge from the low bits of IAOQ_F. */
	#ifdef CONFIG_USER_ONLY
	*pc = env->iaoq_f & -4;
	*cs_base = env->iaoq_b & -4;
	#else
	/* ??? E, T, H, L, B, P bits need to be here, when implemented. */
	flags \|= env->psw & (PSW_W \| PSW_C \| PSW_D);
	flags \|= (env->iaoq_f & 3) << TB_FLAG_PRIV_SHIFT;

	*pc = (env->psw & PSW_C
	? hppa_form_gva_psw(env->psw, env->iasq_f, env->iaoq_f & -4)
	: env->iaoq_f & -4);
	*cs_base = env->iasq_f;

	/* Insert a difference between IAOQ_B and IAOQ_F within the otherwise zero
	low 32-bits of CS_BASE. This will succeed for all direct branches,
	which is the primary case we care about -- using goto_tb within a page.
	Failure is indicated by a zero difference. */
	if (env->iasq_f == env->iasq_b) {
	target_sreg diff = env->iaoq_b - env->iaoq_f;
	if (TARGET_REGISTER_BITS == 32 \|\| diff == (int32_t)diff) {
	*cs_base \|= (uint32_t)diff;
	}
	}
	if ((env->sr[4] == env->sr[5])
	& (env->sr[4] == env->sr[6])
	& (env->sr[4] == env->sr[7])) {
	flags \|= TB_FLAG_SR_SAME;
	}
	#endif

	*pflags = flags;
	}

	target_ureg cpu_hppa_get_psw(CPUHPPAState *env);
	void cpu_hppa_put_psw(CPUHPPAState *env, target_ureg);
	void cpu_hppa_loaded_fr0(CPUHPPAState *env);

	#define cpu_signal_handler cpu_hppa_signal_handler

	int cpu_hppa_signal_handler(int host_signum, void pinfo, void puc);
	hwaddr hppa_cpu_get_phys_page_debug(CPUState *cs, vaddr addr);
	int hppa_cpu_gdb_read_register(CPUState cpu, uint8_t buf, int reg);
	int hppa_cpu_gdb_write_register(CPUState cpu, uint8_t buf, int reg);
	void hppa_cpu_do_interrupt(CPUState *cpu);
	bool hppa_cpu_exec_interrupt(CPUState *cpu, int int_req);
	void hppa_cpu_dump_state(CPUState cs, FILE f, fprintf_function, int);
	#ifdef CONFIG_USER_ONLY
	int hppa_cpu_handle_mmu_fault(CPUState *cpu, vaddr address, int size,
	int rw, int midx);
	#else
	int hppa_get_physical_address(CPUHPPAState *env, vaddr addr, int mmu_idx,
	int type, hwaddr pphys, int pprot);
	extern const MemoryRegionOps hppa_io_eir_ops;
	extern const struct VMStateDescription vmstate_hppa_cpu;
	void hppa_cpu_alarm_timer(void *);
	int hppa_artype_for_page(CPUHPPAState *env, target_ulong vaddr);
	#endif
	void QEMU_NORETURN hppa_dynamic_excp(CPUHPPAState *env, int excp, uintptr_t ra);

	#endif /* HPPA_CPU_H */