hw/slavio_intctl.c - qemu - Git at Google

 /*
  * QEMU Sparc SLAVIO interrupt controller emulation
  *
  * Copyright (c) 2003-2005 Fabrice Bellard
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
 #include "hw.h"
 #include "sun4m.h"
 #include "console.h"

 //#define DEBUG_IRQ_COUNT
 //#define DEBUG_IRQ

 #ifdef DEBUG_IRQ
 #define DPRINTF(fmt, args...) \
 do { printf("IRQ: " fmt , ##args); } while (0)
 #else
 #define DPRINTF(fmt, args...)
 #endif

 /*
  * Registers of interrupt controller in sun4m.
  *
  * This is the interrupt controller part of chip STP2001 (Slave I/O), also
  * produced as NCR89C105. See
  * http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C105.txt
  *
  * There is a system master controller and one for each cpu.
  *
  */

 #define MAX_CPUS 16
 #define MAX_PILS 16

 struct SLAVIO_CPUINTCTLState;

 typedef struct SLAVIO_INTCTLState {
     uint32_t intregm_pending;
     uint32_t intregm_disabled;
     uint32_t target_cpu;
 #ifdef DEBUG_IRQ_COUNT
     uint64_t irq_count[32];
 #endif
     qemu_irq *cpu_irqs[MAX_CPUS];
     const uint32_t *intbit_to_level;
     uint32_t cputimer_lbit, cputimer_mbit;
     uint32_t pil_out[MAX_CPUS];
     struct SLAVIO_CPUINTCTLState *slaves[MAX_CPUS];
 } SLAVIO_INTCTLState;

 typedef struct SLAVIO_CPUINTCTLState {
     uint32_t intreg_pending;
     SLAVIO_INTCTLState *master;
     uint32_t cpu;
 } SLAVIO_CPUINTCTLState;

 #define INTCTL_MAXADDR 0xf
 #define INTCTL_SIZE (INTCTL_MAXADDR + 1)
 #define INTCTLM_SIZE 0x14
 #define MASTER_IRQ_MASK ~0x0fa2007f
 #define MASTER_DISABLE 0x80000000
 #define CPU_SOFTIRQ_MASK 0xfffe0000
 #define CPU_HARDIRQ_MASK 0x0000fffe
 #define CPU_IRQ_INT15_IN 0x0004000
 #define CPU_IRQ_INT15_MASK 0x80000000

 static void slavio_check_interrupts(SLAVIO_INTCTLState *s);

 // per-cpu interrupt controller
 static uint32_t slavio_intctl_mem_readl(void *opaque, target_phys_addr_t addr)
 {
     SLAVIO_CPUINTCTLState *s = opaque;
     uint32_t saddr, ret;

     saddr = addr >> 2;
     switch (saddr) {
     case 0:
         ret = s->intreg_pending;
         break;
     default:
         ret = 0;
         break;
     }
     DPRINTF("read cpu %d reg 0x" TARGET_FMT_plx " = %x\n", cpu, addr, ret);

     return ret;
 }

 static void slavio_intctl_mem_writel(void *opaque, target_phys_addr_t addr,
                                      uint32_t val)
 {
     SLAVIO_CPUINTCTLState *s = opaque;
     uint32_t saddr;

     saddr = addr >> 2;
     DPRINTF("write cpu %d reg 0x" TARGET_FMT_plx " = %x\n", cpu, addr, val);
     switch (saddr) {
     case 1: // clear pending softints
         if (val & CPU_IRQ_INT15_IN)
             val |= CPU_IRQ_INT15_MASK;
         val &= CPU_SOFTIRQ_MASK;
         s->intreg_pending &= ~val;
         slavio_check_interrupts(s->master);
         DPRINTF("Cleared cpu %d irq mask %x, curmask %x\n", s->cpu, val,
                 s->intreg_pending);
         break;
     case 2: // set softint
         val &= CPU_SOFTIRQ_MASK;
         s->intreg_pending |= val;
         slavio_check_interrupts(s->master);
         DPRINTF("Set cpu %d irq mask %x, curmask %x\n", s->cpu, val,
                 s->intreg_pending);
         break;
     default:
         break;
     }
 }

 static CPUReadMemoryFunc *slavio_intctl_mem_read[3] = {
     NULL,
     NULL,
     slavio_intctl_mem_readl,
 };

 static CPUWriteMemoryFunc *slavio_intctl_mem_write[3] = {
     NULL,
     NULL,
     slavio_intctl_mem_writel,
 };

 // master system interrupt controller
 static uint32_t slavio_intctlm_mem_readl(void *opaque, target_phys_addr_t addr)
 {
     SLAVIO_INTCTLState *s = opaque;
     uint32_t saddr, ret;

     saddr = addr >> 2;
     switch (saddr) {
     case 0:
         ret = s->intregm_pending & ~MASTER_DISABLE;
         break;
     case 1:
         ret = s->intregm_disabled & MASTER_IRQ_MASK;
         break;
     case 4:
         ret = s->target_cpu;
         break;
     default:
         ret = 0;
         break;
     }
     DPRINTF("read system reg 0x" TARGET_FMT_plx " = %x\n", addr, ret);

     return ret;
 }

 static void slavio_intctlm_mem_writel(void *opaque, target_phys_addr_t addr,
                                       uint32_t val)
 {
     SLAVIO_INTCTLState *s = opaque;
     uint32_t saddr;

     saddr = addr >> 2;
     DPRINTF("write system reg 0x" TARGET_FMT_plx " = %x\n", addr, val);
     switch (saddr) {
     case 2: // clear (enable)
         // Force clear unused bits
         val &= MASTER_IRQ_MASK;
         s->intregm_disabled &= ~val;
         DPRINTF("Enabled master irq mask %x, curmask %x\n", val,
                 s->intregm_disabled);
         slavio_check_interrupts(s);
         break;
     case 3: // set (disable, clear pending)
         // Force clear unused bits
         val &= MASTER_IRQ_MASK;
         s->intregm_disabled |= val;
         s->intregm_pending &= ~val;
         slavio_check_interrupts(s);
         DPRINTF("Disabled master irq mask %x, curmask %x\n", val,
                 s->intregm_disabled);
         break;
     case 4:
         s->target_cpu = val & (MAX_CPUS - 1);
         slavio_check_interrupts(s);
         DPRINTF("Set master irq cpu %d\n", s->target_cpu);
         break;
     default:
         break;
     }
 }

 static CPUReadMemoryFunc *slavio_intctlm_mem_read[3] = {
     NULL,
     NULL,
     slavio_intctlm_mem_readl,
 };

 static CPUWriteMemoryFunc *slavio_intctlm_mem_write[3] = {
     NULL,
     NULL,
     slavio_intctlm_mem_writel,
 };

 void slavio_pic_info(void *opaque)
 {
     SLAVIO_INTCTLState *s = opaque;
     int i;

     for (i = 0; i < MAX_CPUS; i++) {
         term_printf("per-cpu %d: pending 0x%08x\n", i,
                     s->slaves[i]->intreg_pending);
     }
     term_printf("master: pending 0x%08x, disabled 0x%08x\n",
                 s->intregm_pending, s->intregm_disabled);
 }

 void slavio_irq_info(void *opaque)
 {
 #ifndef DEBUG_IRQ_COUNT
     term_printf("irq statistic code not compiled.\n");
 #else
     SLAVIO_INTCTLState *s = opaque;
     int i;
     int64_t count;

     term_printf("IRQ statistics:\n");
     for (i = 0; i < 32; i++) {
         count = s->irq_count[i];
         if (count > 0)
             term_printf("%2d: %" PRId64 "\n", i, count);
     }
 #endif
 }

 static void slavio_check_interrupts(SLAVIO_INTCTLState *s)
 {
     uint32_t pending = s->intregm_pending, pil_pending;
     unsigned int i, j;

     pending &= ~s->intregm_disabled;

     DPRINTF("pending %x disabled %x\n", pending, s->intregm_disabled);
     for (i = 0; i < MAX_CPUS; i++) {
         pil_pending = 0;
         if (pending && !(s->intregm_disabled & MASTER_DISABLE) &&
             (i == s->target_cpu)) {
             for (j = 0; j < 32; j++) {
                 if (pending & (1 << j))
                     pil_pending |= 1 << s->intbit_to_level[j];
             }
         }
         pil_pending |= (s->slaves[i]->intreg_pending & CPU_SOFTIRQ_MASK) >> 16;

         for (j = 0; j < MAX_PILS; j++) {
             if (pil_pending & (1 << j)) {
                 if (!(s->pil_out[i] & (1 << j)))
                     qemu_irq_raise(s->cpu_irqs[i][j]);
             } else {
                 if (s->pil_out[i] & (1 << j))
                     qemu_irq_lower(s->cpu_irqs[i][j]);
             }
         }
         s->pil_out[i] = pil_pending;
     }
 }

 /*
  * "irq" here is the bit number in the system interrupt register to
  * separate serial and keyboard interrupts sharing a level.
  */
 static void slavio_set_irq(void *opaque, int irq, int level)
 {
     SLAVIO_INTCTLState *s = opaque;
     uint32_t mask = 1 << irq;
     uint32_t pil = s->intbit_to_level[irq];

     DPRINTF("Set cpu %d irq %d -> pil %d level %d\n", s->target_cpu, irq, pil,
             level);
     if (pil > 0) {
         if (level) {
 #ifdef DEBUG_IRQ_COUNT
             s->irq_count[pil]++;
 #endif
             s->intregm_pending |= mask;
             s->slaves[s->target_cpu]->intreg_pending |= 1 << pil;
         } else {
             s->intregm_pending &= ~mask;
             s->slaves[s->target_cpu]->intreg_pending &= ~(1 << pil);
         }
         slavio_check_interrupts(s);
     }
 }

 static void slavio_set_timer_irq_cpu(void *opaque, int cpu, int level)
 {
     SLAVIO_INTCTLState *s = opaque;

     DPRINTF("Set cpu %d local timer level %d\n", cpu, level);

     if (level) {
         s->intregm_pending |= s->cputimer_mbit;
         s->slaves[cpu]->intreg_pending |= s->cputimer_lbit;
     } else {
         s->intregm_pending &= ~s->cputimer_mbit;
         s->slaves[cpu]->intreg_pending &= ~s->cputimer_lbit;
     }

     slavio_check_interrupts(s);
 }

 static void slavio_intctl_save(QEMUFile *f, void *opaque)
 {
     SLAVIO_INTCTLState *s = opaque;
     int i;

     for (i = 0; i < MAX_CPUS; i++) {
         qemu_put_be32s(f, &s->slaves[i]->intreg_pending);
     }
     qemu_put_be32s(f, &s->intregm_pending);
     qemu_put_be32s(f, &s->intregm_disabled);
     qemu_put_be32s(f, &s->target_cpu);
 }

 static int slavio_intctl_load(QEMUFile *f, void *opaque, int version_id)
 {
     SLAVIO_INTCTLState *s = opaque;
     int i;

     if (version_id != 1)
         return -EINVAL;

     for (i = 0; i < MAX_CPUS; i++) {
         qemu_get_be32s(f, &s->slaves[i]->intreg_pending);
     }
     qemu_get_be32s(f, &s->intregm_pending);
     qemu_get_be32s(f, &s->intregm_disabled);
     qemu_get_be32s(f, &s->target_cpu);
     slavio_check_interrupts(s);
     return 0;
 }

 static void slavio_intctl_reset(void *opaque)
 {
     SLAVIO_INTCTLState *s = opaque;
     int i;

     for (i = 0; i < MAX_CPUS; i++) {
         s->slaves[i]->intreg_pending = 0;
     }
     s->intregm_disabled = ~MASTER_IRQ_MASK;
     s->intregm_pending = 0;
     s->target_cpu = 0;
     slavio_check_interrupts(s);
 }

 void *slavio_intctl_init(target_phys_addr_t addr, target_phys_addr_t addrg,
                          const uint32_t *intbit_to_level,
                          qemu_irq **irq, qemu_irq **cpu_irq,
                          qemu_irq **parent_irq, unsigned int cputimer)
 {
     int slavio_intctl_io_memory, slavio_intctlm_io_memory, i;
     SLAVIO_INTCTLState *s;
     SLAVIO_CPUINTCTLState *slave;

     s = qemu_mallocz(sizeof(SLAVIO_INTCTLState));
     if (!s)
         return NULL;

     s->intbit_to_level = intbit_to_level;
     for (i = 0; i < MAX_CPUS; i++) {
         slave = qemu_mallocz(sizeof(SLAVIO_CPUINTCTLState));
         if (!slave)
             return NULL;

         slave->cpu = i;
         slave->master = s;

         slavio_intctl_io_memory = cpu_register_io_memory(0,
                                                          slavio_intctl_mem_read,
                                                          slavio_intctl_mem_write,
                                                          slave);
         cpu_register_physical_memory(addr + i * TARGET_PAGE_SIZE, INTCTL_SIZE,
                                      slavio_intctl_io_memory);

         s->slaves[i] = slave;
         s->cpu_irqs[i] = parent_irq[i];
     }

     slavio_intctlm_io_memory = cpu_register_io_memory(0,
                                                       slavio_intctlm_mem_read,
                                                       slavio_intctlm_mem_write,
                                                       s);
     cpu_register_physical_memory(addrg, INTCTLM_SIZE, slavio_intctlm_io_memory);

     register_savevm("slavio_intctl", addr, 1, slavio_intctl_save,
                     slavio_intctl_load, s);
     qemu_register_reset(slavio_intctl_reset, s);
     *irq = qemu_allocate_irqs(slavio_set_irq, s, 32);

     *cpu_irq = qemu_allocate_irqs(slavio_set_timer_irq_cpu, s, MAX_CPUS);
     s->cputimer_mbit = 1 << cputimer;
     s->cputimer_lbit = 1 << intbit_to_level[cputimer];
     slavio_intctl_reset(s);
     return s;
 }
	/*
	* QEMU Sparc SLAVIO interrupt controller emulation
	*
	* Copyright (c) 2003-2005 Fabrice Bellard
	*
	* Permission is hereby granted, free of charge, to any person obtaining a copy
	* of this software and associated documentation files (the "Software"), to deal
	* in the Software without restriction, including without limitation the rights
	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	* copies of the Software, and to permit persons to whom the Software is
	* furnished to do so, subject to the following conditions:
	*
	* The above copyright notice and this permission notice shall be included in
	* all copies or substantial portions of the Software.
	*
	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	* THE SOFTWARE.
	*/
	#include "hw.h"
	#include "sun4m.h"
	#include "console.h"

	//#define DEBUG_IRQ_COUNT
	//#define DEBUG_IRQ

	#ifdef DEBUG_IRQ
	#define DPRINTF(fmt, args...) \
	do { printf("IRQ: " fmt , ##args); } while (0)
	#else
	#define DPRINTF(fmt, args...)
	#endif

	/*
	* Registers of interrupt controller in sun4m.
	*
	* This is the interrupt controller part of chip STP2001 (Slave I/O), also
	* produced as NCR89C105. See
	* http://www.ibiblio.org/pub/historic-linux/early-ports/Sparc/NCR/NCR89C105.txt
	*
	* There is a system master controller and one for each cpu.
	*
	*/

	#define MAX_CPUS 16
	#define MAX_PILS 16

	struct SLAVIO_CPUINTCTLState;

	typedef struct SLAVIO_INTCTLState {
	uint32_t intregm_pending;
	uint32_t intregm_disabled;
	uint32_t target_cpu;
	#ifdef DEBUG_IRQ_COUNT
	uint64_t irq_count[32];
	#endif
	qemu_irq *cpu_irqs[MAX_CPUS];
	const uint32_t *intbit_to_level;
	uint32_t cputimer_lbit, cputimer_mbit;
	uint32_t pil_out[MAX_CPUS];
	struct SLAVIO_CPUINTCTLState *slaves[MAX_CPUS];
	} SLAVIO_INTCTLState;

	typedef struct SLAVIO_CPUINTCTLState {
	uint32_t intreg_pending;
	SLAVIO_INTCTLState *master;
	uint32_t cpu;
	} SLAVIO_CPUINTCTLState;

	#define INTCTL_MAXADDR 0xf
	#define INTCTL_SIZE (INTCTL_MAXADDR + 1)
	#define INTCTLM_SIZE 0x14
	#define MASTER_IRQ_MASK ~0x0fa2007f
	#define MASTER_DISABLE 0x80000000
	#define CPU_SOFTIRQ_MASK 0xfffe0000
	#define CPU_HARDIRQ_MASK 0x0000fffe
	#define CPU_IRQ_INT15_IN 0x0004000
	#define CPU_IRQ_INT15_MASK 0x80000000

	static void slavio_check_interrupts(SLAVIO_INTCTLState *s);

	// per-cpu interrupt controller
	static uint32_t slavio_intctl_mem_readl(void *opaque, target_phys_addr_t addr)
	{
	SLAVIO_CPUINTCTLState *s = opaque;
	uint32_t saddr, ret;

	saddr = addr >> 2;
	switch (saddr) {
	case 0:
	ret = s->intreg_pending;
	break;
	default:
	ret = 0;
	break;
	}
	DPRINTF("read cpu %d reg 0x" TARGET_FMT_plx " = %x\n", cpu, addr, ret);

	return ret;
	}

	static void slavio_intctl_mem_writel(void *opaque, target_phys_addr_t addr,
	uint32_t val)
	{
	SLAVIO_CPUINTCTLState *s = opaque;
	uint32_t saddr;

	saddr = addr >> 2;
	DPRINTF("write cpu %d reg 0x" TARGET_FMT_plx " = %x\n", cpu, addr, val);
	switch (saddr) {
	case 1: // clear pending softints
	if (val & CPU_IRQ_INT15_IN)
	val \|= CPU_IRQ_INT15_MASK;
	val &= CPU_SOFTIRQ_MASK;
	s->intreg_pending &= ~val;
	slavio_check_interrupts(s->master);
	DPRINTF("Cleared cpu %d irq mask %x, curmask %x\n", s->cpu, val,
	s->intreg_pending);
	break;
	case 2: // set softint
	val &= CPU_SOFTIRQ_MASK;
	s->intreg_pending \|= val;
	slavio_check_interrupts(s->master);
	DPRINTF("Set cpu %d irq mask %x, curmask %x\n", s->cpu, val,
	s->intreg_pending);
	break;
	default:
	break;
	}
	}

	static CPUReadMemoryFunc *slavio_intctl_mem_read[3] = {
	NULL,
	NULL,
	slavio_intctl_mem_readl,
	};

	static CPUWriteMemoryFunc *slavio_intctl_mem_write[3] = {
	NULL,
	NULL,
	slavio_intctl_mem_writel,
	};

	// master system interrupt controller
	static uint32_t slavio_intctlm_mem_readl(void *opaque, target_phys_addr_t addr)
	{
	SLAVIO_INTCTLState *s = opaque;
	uint32_t saddr, ret;

	saddr = addr >> 2;
	switch (saddr) {
	case 0:
	ret = s->intregm_pending & ~MASTER_DISABLE;
	break;
	case 1:
	ret = s->intregm_disabled & MASTER_IRQ_MASK;
	break;
	case 4:
	ret = s->target_cpu;
	break;
	default:
	ret = 0;
	break;
	}
	DPRINTF("read system reg 0x" TARGET_FMT_plx " = %x\n", addr, ret);

	return ret;
	}

	static void slavio_intctlm_mem_writel(void *opaque, target_phys_addr_t addr,
	uint32_t val)
	{
	SLAVIO_INTCTLState *s = opaque;
	uint32_t saddr;

	saddr = addr >> 2;
	DPRINTF("write system reg 0x" TARGET_FMT_plx " = %x\n", addr, val);
	switch (saddr) {
	case 2: // clear (enable)
	// Force clear unused bits
	val &= MASTER_IRQ_MASK;
	s->intregm_disabled &= ~val;
	DPRINTF("Enabled master irq mask %x, curmask %x\n", val,
	s->intregm_disabled);
	slavio_check_interrupts(s);
	break;
	case 3: // set (disable, clear pending)
	// Force clear unused bits
	val &= MASTER_IRQ_MASK;
	s->intregm_disabled \|= val;
	s->intregm_pending &= ~val;
	slavio_check_interrupts(s);
	DPRINTF("Disabled master irq mask %x, curmask %x\n", val,
	s->intregm_disabled);
	break;
	case 4:
	s->target_cpu = val & (MAX_CPUS - 1);
	slavio_check_interrupts(s);
	DPRINTF("Set master irq cpu %d\n", s->target_cpu);
	break;
	default:
	break;
	}
	}

	static CPUReadMemoryFunc *slavio_intctlm_mem_read[3] = {
	NULL,
	NULL,
	slavio_intctlm_mem_readl,
	};

	static CPUWriteMemoryFunc *slavio_intctlm_mem_write[3] = {
	NULL,
	NULL,
	slavio_intctlm_mem_writel,
	};

	void slavio_pic_info(void *opaque)
	{
	SLAVIO_INTCTLState *s = opaque;
	int i;

	for (i = 0; i < MAX_CPUS; i++) {
	term_printf("per-cpu %d: pending 0x%08x\n", i,
	s->slaves[i]->intreg_pending);
	}
	term_printf("master: pending 0x%08x, disabled 0x%08x\n",
	s->intregm_pending, s->intregm_disabled);
	}

	void slavio_irq_info(void *opaque)
	{
	#ifndef DEBUG_IRQ_COUNT
	term_printf("irq statistic code not compiled.\n");
	#else
	SLAVIO_INTCTLState *s = opaque;
	int i;
	int64_t count;

	term_printf("IRQ statistics:\n");
	for (i = 0; i < 32; i++) {
	count = s->irq_count[i];
	if (count > 0)
	term_printf("%2d: %" PRId64 "\n", i, count);
	}
	#endif
	}

	static void slavio_check_interrupts(SLAVIO_INTCTLState *s)
	{
	uint32_t pending = s->intregm_pending, pil_pending;
	unsigned int i, j;

	pending &= ~s->intregm_disabled;

	DPRINTF("pending %x disabled %x\n", pending, s->intregm_disabled);
	for (i = 0; i < MAX_CPUS; i++) {
	pil_pending = 0;
	if (pending && !(s->intregm_disabled & MASTER_DISABLE) &&
	(i == s->target_cpu)) {
	for (j = 0; j < 32; j++) {
	if (pending & (1 << j))
	pil_pending \|= 1 << s->intbit_to_level[j];
	}
	}
	pil_pending \|= (s->slaves[i]->intreg_pending & CPU_SOFTIRQ_MASK) >> 16;

	for (j = 0; j < MAX_PILS; j++) {
	if (pil_pending & (1 << j)) {
	if (!(s->pil_out[i] & (1 << j)))
	qemu_irq_raise(s->cpu_irqs[i][j]);
	} else {
	if (s->pil_out[i] & (1 << j))
	qemu_irq_lower(s->cpu_irqs[i][j]);
	}
	}
	s->pil_out[i] = pil_pending;
	}
	}

	/*
	* "irq" here is the bit number in the system interrupt register to
	* separate serial and keyboard interrupts sharing a level.
	*/
	static void slavio_set_irq(void *opaque, int irq, int level)
	{
	SLAVIO_INTCTLState *s = opaque;
	uint32_t mask = 1 << irq;
	uint32_t pil = s->intbit_to_level[irq];

	DPRINTF("Set cpu %d irq %d -> pil %d level %d\n", s->target_cpu, irq, pil,
	level);
	if (pil > 0) {
	if (level) {
	#ifdef DEBUG_IRQ_COUNT
	s->irq_count[pil]++;
	#endif
	s->intregm_pending \|= mask;
	s->slaves[s->target_cpu]->intreg_pending \|= 1 << pil;
	} else {
	s->intregm_pending &= ~mask;
	s->slaves[s->target_cpu]->intreg_pending &= ~(1 << pil);
	}
	slavio_check_interrupts(s);
	}
	}

	static void slavio_set_timer_irq_cpu(void *opaque, int cpu, int level)
	{
	SLAVIO_INTCTLState *s = opaque;

	DPRINTF("Set cpu %d local timer level %d\n", cpu, level);

	if (level) {
	s->intregm_pending \|= s->cputimer_mbit;
	s->slaves[cpu]->intreg_pending \|= s->cputimer_lbit;
	} else {
	s->intregm_pending &= ~s->cputimer_mbit;
	s->slaves[cpu]->intreg_pending &= ~s->cputimer_lbit;
	}

	slavio_check_interrupts(s);
	}

	static void slavio_intctl_save(QEMUFile f, void opaque)
	{
	SLAVIO_INTCTLState *s = opaque;
	int i;

	for (i = 0; i < MAX_CPUS; i++) {
	qemu_put_be32s(f, &s->slaves[i]->intreg_pending);
	}
	qemu_put_be32s(f, &s->intregm_pending);
	qemu_put_be32s(f, &s->intregm_disabled);
	qemu_put_be32s(f, &s->target_cpu);
	}

	static int slavio_intctl_load(QEMUFile f, void opaque, int version_id)
	{
	SLAVIO_INTCTLState *s = opaque;
	int i;

	if (version_id != 1)
	return -EINVAL;

	for (i = 0; i < MAX_CPUS; i++) {
	qemu_get_be32s(f, &s->slaves[i]->intreg_pending);
	}
	qemu_get_be32s(f, &s->intregm_pending);
	qemu_get_be32s(f, &s->intregm_disabled);
	qemu_get_be32s(f, &s->target_cpu);
	slavio_check_interrupts(s);
	return 0;
	}

	static void slavio_intctl_reset(void *opaque)
	{
	SLAVIO_INTCTLState *s = opaque;
	int i;

	for (i = 0; i < MAX_CPUS; i++) {
	s->slaves[i]->intreg_pending = 0;
	}
	s->intregm_disabled = ~MASTER_IRQ_MASK;
	s->intregm_pending = 0;
	s->target_cpu = 0;
	slavio_check_interrupts(s);
	}

	void *slavio_intctl_init(target_phys_addr_t addr, target_phys_addr_t addrg,
	const uint32_t *intbit_to_level,
	qemu_irq irq, qemu_irq cpu_irq,
	qemu_irq **parent_irq, unsigned int cputimer)
	{
	int slavio_intctl_io_memory, slavio_intctlm_io_memory, i;
	SLAVIO_INTCTLState *s;
	SLAVIO_CPUINTCTLState *slave;

	s = qemu_mallocz(sizeof(SLAVIO_INTCTLState));
	if (!s)
	return NULL;

	s->intbit_to_level = intbit_to_level;
	for (i = 0; i < MAX_CPUS; i++) {
	slave = qemu_mallocz(sizeof(SLAVIO_CPUINTCTLState));
	if (!slave)
	return NULL;

	slave->cpu = i;
	slave->master = s;

	slavio_intctl_io_memory = cpu_register_io_memory(0,
	slavio_intctl_mem_read,
	slavio_intctl_mem_write,
	slave);
	cpu_register_physical_memory(addr + i * TARGET_PAGE_SIZE, INTCTL_SIZE,
	slavio_intctl_io_memory);

	s->slaves[i] = slave;
	s->cpu_irqs[i] = parent_irq[i];
	}

	slavio_intctlm_io_memory = cpu_register_io_memory(0,
	slavio_intctlm_mem_read,
	slavio_intctlm_mem_write,
	s);
	cpu_register_physical_memory(addrg, INTCTLM_SIZE, slavio_intctlm_io_memory);

	register_savevm("slavio_intctl", addr, 1, slavio_intctl_save,
	slavio_intctl_load, s);
	qemu_register_reset(slavio_intctl_reset, s);
	*irq = qemu_allocate_irqs(slavio_set_irq, s, 32);

	*cpu_irq = qemu_allocate_irqs(slavio_set_timer_irq_cpu, s, MAX_CPUS);
	s->cputimer_mbit = 1 << cputimer;
	s->cputimer_lbit = 1 << intbit_to_level[cputimer];
	slavio_intctl_reset(s);
	return s;
	}