target/hppa/int_helper.c - qemu - Git at Google

 /*
  *  HPPA interrupt helper routines
  *
  *  Copyright (c) 2017 Richard Henderson
  *
  * 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/main-loop.h"
 #include "qemu/log.h"
 #include "cpu.h"
 #include "exec/helper-proto.h"
 #include "hw/core/cpu.h"
 #include "hw/hppa/hppa_hardware.h"

 static void eval_interrupt(HPPACPU *cpu)
 {
     CPUState *cs = CPU(cpu);
     if (cpu->env.cr[CR_EIRR]) {
         cpu_interrupt(cs, CPU_INTERRUPT_HARD);
     } else {
         cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
     }
 }

 /* Each CPU has a word mapped into the GSC bus.  Anything on the GSC bus
  * can write to this word to raise an external interrupt on the target CPU.
  * This includes the system controller (DINO) for regular devices, or
  * another CPU for SMP interprocessor interrupts.
  */
 static uint64_t io_eir_read(void *opaque, hwaddr addr, unsigned size)
 {
     HPPACPU *cpu = opaque;

     /* ??? What does a read of this register over the GSC bus do?  */
     return cpu->env.cr[CR_EIRR];
 }

 static void io_eir_write(void *opaque, hwaddr addr,
                          uint64_t data, unsigned size)
 {
     HPPACPU *cpu = opaque;
     CPUHPPAState *env = &cpu->env;
     int widthm1 = 31;
     int le_bit;

     /* The default PSW.W controls the width of EIRR. */
     if (hppa_is_pa20(env) && env->cr[CR_PSW_DEFAULT] & PDC_PSW_WIDE_BIT) {
         widthm1 = 63;
     }
     le_bit = ~data & widthm1;

     env->cr[CR_EIRR] |= 1ull << le_bit;
     eval_interrupt(cpu);
 }

 const MemoryRegionOps hppa_io_eir_ops = {
     .read = io_eir_read,
     .write = io_eir_write,
     .valid.min_access_size = 4,
     .valid.max_access_size = 4,
     .impl.min_access_size = 4,
     .impl.max_access_size = 4,
 };

 void hppa_cpu_alarm_timer(void *opaque)
 {
     /* Raise interrupt 0.  */
     io_eir_write(opaque, 0, 0, 4);
 }

 void HELPER(write_eirr)(CPUHPPAState *env, target_ulong val)
 {
     env->cr[CR_EIRR] &= ~val;
     bql_lock();
     eval_interrupt(env_archcpu(env));
     bql_unlock();
 }

 void hppa_cpu_do_interrupt(CPUState *cs)
 {
     HPPACPU *cpu = HPPA_CPU(cs);
     CPUHPPAState *env = &cpu->env;
     int i = cs->exception_index;
     uint64_t old_psw;

     /* As documented in pa2.0 -- interruption handling.  */
     /* step 1 */
     env->cr[CR_IPSW] = old_psw = cpu_hppa_get_psw(env);

     /* step 2 -- Note PSW_W is masked out again for pa1.x */
     cpu_hppa_put_psw(env,
                      (env->cr[CR_PSW_DEFAULT] & PDC_PSW_WIDE_BIT ? PSW_W : 0) |
                      (i == EXCP_HPMC ? PSW_M : 0));

     /* step 3 */
     /*
      * For pa1.x, IIASQ is simply a copy of IASQ.
      * For pa2.0, IIASQ is the top bits of the virtual address,
      *            or zero if translation is disabled.
      */
     if (!hppa_is_pa20(env)) {
         env->cr[CR_IIASQ] = env->iasq_f >> 32;
         env->cr_back[0] = env->iasq_b >> 32;
     } else if (old_psw & PSW_C) {
         env->cr[CR_IIASQ] =
             hppa_form_gva_psw(old_psw, env->iasq_f, env->iaoq_f) >> 32;
         env->cr_back[0] =
             hppa_form_gva_psw(old_psw, env->iasq_b, env->iaoq_b) >> 32;
     } else {
         env->cr[CR_IIASQ] = 0;
         env->cr_back[0] = 0;
     }
     env->cr[CR_IIAOQ] = env->iaoq_f;
     env->cr_back[1] = env->iaoq_b;

     if (old_psw & PSW_Q) {
         /* step 5 */
         /* ISR and IOR will be set elsewhere.  */
         switch (i) {
         case EXCP_ILL:
         case EXCP_BREAK:
         case EXCP_PRIV_REG:
         case EXCP_PRIV_OPR:
             /* IIR set via translate.c.  */
             break;

         case EXCP_OVERFLOW:
         case EXCP_COND:
         case EXCP_ASSIST:
         case EXCP_DTLB_MISS:
         case EXCP_NA_ITLB_MISS:
         case EXCP_NA_DTLB_MISS:
         case EXCP_DMAR:
         case EXCP_DMPI:
         case EXCP_UNALIGN:
         case EXCP_DMP:
         case EXCP_DMB:
         case EXCP_TLB_DIRTY:
         case EXCP_PAGE_REF:
         case EXCP_ASSIST_EMU:
             {
                 /* Avoid reading directly from the virtual address, lest we
                    raise another exception from some sort of TLB issue.  */
                 /* ??? An alternate fool-proof method would be to store the
                    instruction data into the unwind info.  That's probably
                    a bit too much in the way of extra storage required.  */
                 vaddr vaddr = env->iaoq_f & -4;
                 hwaddr paddr = vaddr;

                 if (old_psw & PSW_C) {
                     int prot, t;

                     vaddr = hppa_form_gva_psw(old_psw, env->iasq_f, vaddr);
                     t = hppa_get_physical_address(env, vaddr, MMU_KERNEL_IDX,
                                                   0, &paddr, &prot, NULL);
                     if (t >= 0) {
                         /* We can't re-load the instruction.  */
                         env->cr[CR_IIR] = 0;
                         break;
                     }
                 }
                 env->cr[CR_IIR] = ldl_phys(cs->as, paddr);
             }
             break;

         default:
             /* Other exceptions do not set IIR.  */
             break;
         }

         /* step 6 */
         env->shadow[0] = env->gr[1];
         env->shadow[1] = env->gr[8];
         env->shadow[2] = env->gr[9];
         env->shadow[3] = env->gr[16];
         env->shadow[4] = env->gr[17];
         env->shadow[5] = env->gr[24];
         env->shadow[6] = env->gr[25];
     }

     /* step 7 */
     if (i == EXCP_TOC) {
         env->iaoq_f = hppa_form_gva(env, 0, FIRMWARE_START);
         /* help SeaBIOS and provide iaoq_b and iasq_back in shadow regs */
         env->gr[24] = env->cr_back[0];
         env->gr[25] = env->cr_back[1];
     } else {
         env->iaoq_f = hppa_form_gva(env, 0, env->cr[CR_IVA] + 32 * i);
     }
     env->iaoq_b = hppa_form_gva(env, 0, env->iaoq_f + 4);
     env->iasq_f = 0;
     env->iasq_b = 0;

     if (qemu_loglevel_mask(CPU_LOG_INT)) {
         static const char * const names[] = {
             [EXCP_HPMC]          = "high priority machine check",
             [EXCP_POWER_FAIL]    = "power fail interrupt",
             [EXCP_RC]            = "recovery counter trap",
             [EXCP_EXT_INTERRUPT] = "external interrupt",
             [EXCP_LPMC]          = "low priority machine check",
             [EXCP_ITLB_MISS]     = "instruction tlb miss fault",
             [EXCP_IMP]           = "instruction memory protection trap",
             [EXCP_ILL]           = "illegal instruction trap",
             [EXCP_BREAK]         = "break instruction trap",
             [EXCP_PRIV_OPR]      = "privileged operation trap",
             [EXCP_PRIV_REG]      = "privileged register trap",
             [EXCP_OVERFLOW]      = "overflow trap",
             [EXCP_COND]          = "conditional trap",
             [EXCP_ASSIST]        = "assist exception trap",
             [EXCP_DTLB_MISS]     = "data tlb miss fault",
             [EXCP_NA_ITLB_MISS]  = "non-access instruction tlb miss",
             [EXCP_NA_DTLB_MISS]  = "non-access data tlb miss",
             [EXCP_DMP]           = "data memory protection trap",
             [EXCP_DMB]           = "data memory break trap",
             [EXCP_TLB_DIRTY]     = "tlb dirty bit trap",
             [EXCP_PAGE_REF]      = "page reference trap",
             [EXCP_ASSIST_EMU]    = "assist emulation trap",
             [EXCP_HPT]           = "high-privilege transfer trap",
             [EXCP_LPT]           = "low-privilege transfer trap",
             [EXCP_TB]            = "taken branch trap",
             [EXCP_DMAR]          = "data memory access rights trap",
             [EXCP_DMPI]          = "data memory protection id trap",
             [EXCP_UNALIGN]       = "unaligned data reference trap",
             [EXCP_PER_INTERRUPT] = "performance monitor interrupt",
             [EXCP_SYSCALL]       = "syscall",
             [EXCP_SYSCALL_LWS]   = "syscall-lws",
             [EXCP_TOC]           = "TOC (transfer of control)",
         };
         static int count;
         const char *name = NULL;
         char unknown[16];

         if (i >= 0 && i < ARRAY_SIZE(names)) {
             name = names[i];
         }
         if (!name) {
             snprintf(unknown, sizeof(unknown), "unknown %d", i);
             name = unknown;
         }
         qemu_log("INT %6d: %s @ " TARGET_FMT_lx ":" TARGET_FMT_lx
                  " for " TARGET_FMT_lx ":" TARGET_FMT_lx "\n",
                  ++count, name, env->cr[CR_IIASQ], env->cr[CR_IIAOQ],
                  env->cr[CR_ISR], env->cr[CR_IOR]);
     }
     cs->exception_index = -1;
 }

 bool hppa_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
 {
     HPPACPU *cpu = HPPA_CPU(cs);
     CPUHPPAState *env = &cpu->env;

     if (interrupt_request & CPU_INTERRUPT_NMI) {
         /* Raise TOC (NMI) interrupt */
         cpu_reset_interrupt(cs, CPU_INTERRUPT_NMI);
         cs->exception_index = EXCP_TOC;
         hppa_cpu_do_interrupt(cs);
         return true;
     }

     /* If interrupts are requested and enabled, raise them.  */
     if ((interrupt_request & CPU_INTERRUPT_HARD)
         && (env->psw & PSW_I)
         && (env->cr[CR_EIRR] & env->cr[CR_EIEM])) {
         cs->exception_index = EXCP_EXT_INTERRUPT;
         hppa_cpu_do_interrupt(cs);
         return true;
     }
     return false;
 }
	/*
	* HPPA interrupt helper routines
	*
	* Copyright (c) 2017 Richard Henderson
	*
	* 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/main-loop.h"
	#include "qemu/log.h"
	#include "cpu.h"
	#include "exec/helper-proto.h"
	#include "hw/core/cpu.h"
	#include "hw/hppa/hppa_hardware.h"

	static void eval_interrupt(HPPACPU *cpu)
	{
	CPUState *cs = CPU(cpu);
	if (cpu->env.cr[CR_EIRR]) {
	cpu_interrupt(cs, CPU_INTERRUPT_HARD);
	} else {
	cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
	}
	}

	/* Each CPU has a word mapped into the GSC bus. Anything on the GSC bus
	* can write to this word to raise an external interrupt on the target CPU.
	* This includes the system controller (DINO) for regular devices, or
	* another CPU for SMP interprocessor interrupts.
	*/
	static uint64_t io_eir_read(void *opaque, hwaddr addr, unsigned size)
	{
	HPPACPU *cpu = opaque;

	/* ??? What does a read of this register over the GSC bus do? */
	return cpu->env.cr[CR_EIRR];
	}

	static void io_eir_write(void *opaque, hwaddr addr,
	uint64_t data, unsigned size)
	{
	HPPACPU *cpu = opaque;
	CPUHPPAState *env = &cpu->env;
	int widthm1 = 31;
	int le_bit;

	/* The default PSW.W controls the width of EIRR. */
	if (hppa_is_pa20(env) && env->cr[CR_PSW_DEFAULT] & PDC_PSW_WIDE_BIT) {
	widthm1 = 63;
	}
	le_bit = ~data & widthm1;

	env->cr[CR_EIRR] \|= 1ull << le_bit;
	eval_interrupt(cpu);
	}

	const MemoryRegionOps hppa_io_eir_ops = {
	.read = io_eir_read,
	.write = io_eir_write,
	.valid.min_access_size = 4,
	.valid.max_access_size = 4,
	.impl.min_access_size = 4,
	.impl.max_access_size = 4,
	};

	void hppa_cpu_alarm_timer(void *opaque)
	{
	/* Raise interrupt 0. */
	io_eir_write(opaque, 0, 0, 4);
	}

	void HELPER(write_eirr)(CPUHPPAState *env, target_ulong val)
	{
	env->cr[CR_EIRR] &= ~val;
	bql_lock();
	eval_interrupt(env_archcpu(env));
	bql_unlock();
	}

	void hppa_cpu_do_interrupt(CPUState *cs)
	{
	HPPACPU *cpu = HPPA_CPU(cs);
	CPUHPPAState *env = &cpu->env;
	int i = cs->exception_index;
	uint64_t old_psw;

	/* As documented in pa2.0 -- interruption handling. */
	/* step 1 */
	env->cr[CR_IPSW] = old_psw = cpu_hppa_get_psw(env);

	/* step 2 -- Note PSW_W is masked out again for pa1.x */
	cpu_hppa_put_psw(env,
	(env->cr[CR_PSW_DEFAULT] & PDC_PSW_WIDE_BIT ? PSW_W : 0) \|
	(i == EXCP_HPMC ? PSW_M : 0));

	/* step 3 */
	/*
	* For pa1.x, IIASQ is simply a copy of IASQ.
	* For pa2.0, IIASQ is the top bits of the virtual address,
	* or zero if translation is disabled.
	*/
	if (!hppa_is_pa20(env)) {
	env->cr[CR_IIASQ] = env->iasq_f >> 32;
	env->cr_back[0] = env->iasq_b >> 32;
	} else if (old_psw & PSW_C) {
	env->cr[CR_IIASQ] =
	hppa_form_gva_psw(old_psw, env->iasq_f, env->iaoq_f) >> 32;
	env->cr_back[0] =
	hppa_form_gva_psw(old_psw, env->iasq_b, env->iaoq_b) >> 32;
	} else {
	env->cr[CR_IIASQ] = 0;
	env->cr_back[0] = 0;
	}
	env->cr[CR_IIAOQ] = env->iaoq_f;
	env->cr_back[1] = env->iaoq_b;

	if (old_psw & PSW_Q) {
	/* step 5 */
	/* ISR and IOR will be set elsewhere. */
	switch (i) {
	case EXCP_ILL:
	case EXCP_BREAK:
	case EXCP_PRIV_REG:
	case EXCP_PRIV_OPR:
	/* IIR set via translate.c. */
	break;

	case EXCP_OVERFLOW:
	case EXCP_COND:
	case EXCP_ASSIST:
	case EXCP_DTLB_MISS:
	case EXCP_NA_ITLB_MISS:
	case EXCP_NA_DTLB_MISS:
	case EXCP_DMAR:
	case EXCP_DMPI:
	case EXCP_UNALIGN:
	case EXCP_DMP:
	case EXCP_DMB:
	case EXCP_TLB_DIRTY:
	case EXCP_PAGE_REF:
	case EXCP_ASSIST_EMU:
	{
	/* Avoid reading directly from the virtual address, lest we
	raise another exception from some sort of TLB issue. */
	/* ??? An alternate fool-proof method would be to store the
	instruction data into the unwind info. That's probably
	a bit too much in the way of extra storage required. */
	vaddr vaddr = env->iaoq_f & -4;
	hwaddr paddr = vaddr;

	if (old_psw & PSW_C) {
	int prot, t;

	vaddr = hppa_form_gva_psw(old_psw, env->iasq_f, vaddr);
	t = hppa_get_physical_address(env, vaddr, MMU_KERNEL_IDX,
	0, &paddr, &prot, NULL);
	if (t >= 0) {
	/* We can't re-load the instruction. */
	env->cr[CR_IIR] = 0;
	break;
	}
	}
	env->cr[CR_IIR] = ldl_phys(cs->as, paddr);
	}
	break;

	default:
	/* Other exceptions do not set IIR. */
	break;
	}

	/* step 6 */
	env->shadow[0] = env->gr[1];
	env->shadow[1] = env->gr[8];
	env->shadow[2] = env->gr[9];
	env->shadow[3] = env->gr[16];
	env->shadow[4] = env->gr[17];
	env->shadow[5] = env->gr[24];
	env->shadow[6] = env->gr[25];
	}

	/* step 7 */
	if (i == EXCP_TOC) {
	env->iaoq_f = hppa_form_gva(env, 0, FIRMWARE_START);
	/* help SeaBIOS and provide iaoq_b and iasq_back in shadow regs */
	env->gr[24] = env->cr_back[0];
	env->gr[25] = env->cr_back[1];
	} else {
	env->iaoq_f = hppa_form_gva(env, 0, env->cr[CR_IVA] + 32 * i);
	}
	env->iaoq_b = hppa_form_gva(env, 0, env->iaoq_f + 4);
	env->iasq_f = 0;
	env->iasq_b = 0;

	if (qemu_loglevel_mask(CPU_LOG_INT)) {
	static const char * const names[] = {
	[EXCP_HPMC] = "high priority machine check",
	[EXCP_POWER_FAIL] = "power fail interrupt",
	[EXCP_RC] = "recovery counter trap",
	[EXCP_EXT_INTERRUPT] = "external interrupt",
	[EXCP_LPMC] = "low priority machine check",
	[EXCP_ITLB_MISS] = "instruction tlb miss fault",
	[EXCP_IMP] = "instruction memory protection trap",
	[EXCP_ILL] = "illegal instruction trap",
	[EXCP_BREAK] = "break instruction trap",
	[EXCP_PRIV_OPR] = "privileged operation trap",
	[EXCP_PRIV_REG] = "privileged register trap",
	[EXCP_OVERFLOW] = "overflow trap",
	[EXCP_COND] = "conditional trap",
	[EXCP_ASSIST] = "assist exception trap",
	[EXCP_DTLB_MISS] = "data tlb miss fault",
	[EXCP_NA_ITLB_MISS] = "non-access instruction tlb miss",
	[EXCP_NA_DTLB_MISS] = "non-access data tlb miss",
	[EXCP_DMP] = "data memory protection trap",
	[EXCP_DMB] = "data memory break trap",
	[EXCP_TLB_DIRTY] = "tlb dirty bit trap",
	[EXCP_PAGE_REF] = "page reference trap",
	[EXCP_ASSIST_EMU] = "assist emulation trap",
	[EXCP_HPT] = "high-privilege transfer trap",
	[EXCP_LPT] = "low-privilege transfer trap",
	[EXCP_TB] = "taken branch trap",
	[EXCP_DMAR] = "data memory access rights trap",
	[EXCP_DMPI] = "data memory protection id trap",
	[EXCP_UNALIGN] = "unaligned data reference trap",
	[EXCP_PER_INTERRUPT] = "performance monitor interrupt",
	[EXCP_SYSCALL] = "syscall",
	[EXCP_SYSCALL_LWS] = "syscall-lws",
	[EXCP_TOC] = "TOC (transfer of control)",
	};
	static int count;
	const char *name = NULL;
	char unknown[16];

	if (i >= 0 && i < ARRAY_SIZE(names)) {
	name = names[i];
	}
	if (!name) {
	snprintf(unknown, sizeof(unknown), "unknown %d", i);
	name = unknown;
	}
	qemu_log("INT %6d: %s @ " TARGET_FMT_lx ":" TARGET_FMT_lx
	" for " TARGET_FMT_lx ":" TARGET_FMT_lx "\n",
	++count, name, env->cr[CR_IIASQ], env->cr[CR_IIAOQ],
	env->cr[CR_ISR], env->cr[CR_IOR]);
	}
	cs->exception_index = -1;
	}

	bool hppa_cpu_exec_interrupt(CPUState *cs, int interrupt_request)
	{
	HPPACPU *cpu = HPPA_CPU(cs);
	CPUHPPAState *env = &cpu->env;

	if (interrupt_request & CPU_INTERRUPT_NMI) {
	/* Raise TOC (NMI) interrupt */
	cpu_reset_interrupt(cs, CPU_INTERRUPT_NMI);
	cs->exception_index = EXCP_TOC;
	hppa_cpu_do_interrupt(cs);
	return true;
	}

	/* If interrupts are requested and enabled, raise them. */
	if ((interrupt_request & CPU_INTERRUPT_HARD)
	&& (env->psw & PSW_I)
	&& (env->cr[CR_EIRR] & env->cr[CR_EIEM])) {
	cs->exception_index = EXCP_EXT_INTERRUPT;
	hppa_cpu_do_interrupt(cs);
	return true;
	}
	return false;
	}