hw/slavio_misc.c - qemu - Git at Google

 /*
  * QEMU Sparc SLAVIO aux io port emulation
  *
  * Copyright (c) 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 "sysemu.h"

 /* debug misc */
 //#define DEBUG_MISC

 /*
  * This is the auxio port, chip control and system control 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
  *
  * This also includes the PMC CPU idle controller.
  */

 #ifdef DEBUG_MISC
 #define MISC_DPRINTF(fmt, args...) \
 do { printf("MISC: " fmt , ##args); } while (0)
 #else
 #define MISC_DPRINTF(fmt, args...)
 #endif

 typedef struct MiscState {
     qemu_irq irq;
     uint8_t config;
     uint8_t aux1, aux2;
     uint8_t diag, mctrl;
     uint32_t sysctrl;
     uint16_t leds;
     qemu_irq cpu_halt;
     qemu_irq fdc_tc;
 } MiscState;

 #define MISC_SIZE 1
 #define SYSCTRL_MAXADDR 3
 #define SYSCTRL_SIZE (SYSCTRL_MAXADDR + 1)
 #define LED_MAXADDR 1
 #define LED_SIZE (LED_MAXADDR + 1)

 #define MISC_MASK 0x0fff0000
 #define MISC_LEDS 0x01600000
 #define MISC_CFG  0x01800000
 #define MISC_DIAG 0x01a00000
 #define MISC_MDM  0x01b00000
 #define MISC_SYS  0x01f00000

 #define AUX1_TC        0x02

 #define AUX2_PWROFF    0x01
 #define AUX2_PWRINTCLR 0x02
 #define AUX2_PWRFAIL   0x20

 #define CFG_PWRINTEN   0x08

 #define SYS_RESET      0x01
 #define SYS_RESETSTAT  0x02

 static void slavio_misc_update_irq(void *opaque)
 {
     MiscState *s = opaque;

     if ((s->aux2 & AUX2_PWRFAIL) && (s->config & CFG_PWRINTEN)) {
         MISC_DPRINTF("Raise IRQ\n");
         qemu_irq_raise(s->irq);
     } else {
         MISC_DPRINTF("Lower IRQ\n");
         qemu_irq_lower(s->irq);
     }
 }

 static void slavio_misc_reset(void *opaque)
 {
     MiscState *s = opaque;

     // Diagnostic and system control registers not cleared in reset
     s->config = s->aux1 = s->aux2 = s->mctrl = 0;
 }

 void slavio_set_power_fail(void *opaque, int power_failing)
 {
     MiscState *s = opaque;

     MISC_DPRINTF("Power fail: %d, config: %d\n", power_failing, s->config);
     if (power_failing && (s->config & CFG_PWRINTEN)) {
         s->aux2 |= AUX2_PWRFAIL;
     } else {
         s->aux2 &= ~AUX2_PWRFAIL;
     }
     slavio_misc_update_irq(s);
 }

 static void slavio_misc_mem_writeb(void *opaque, target_phys_addr_t addr,
                                    uint32_t val)
 {
     MiscState *s = opaque;

     switch (addr & MISC_MASK) {
     case MISC_CFG:
         MISC_DPRINTF("Write config %2.2x\n", val & 0xff);
         s->config = val & 0xff;
         slavio_misc_update_irq(s);
         break;
     case MISC_DIAG:
         MISC_DPRINTF("Write diag %2.2x\n", val & 0xff);
         s->diag = val & 0xff;
         break;
     case MISC_MDM:
         MISC_DPRINTF("Write modem control %2.2x\n", val & 0xff);
         s->mctrl = val & 0xff;
         break;
     default:
         break;
     }
 }

 static uint32_t slavio_misc_mem_readb(void *opaque, target_phys_addr_t addr)
 {
     MiscState *s = opaque;
     uint32_t ret = 0;

     switch (addr & MISC_MASK) {
     case MISC_CFG:
         ret = s->config;
         MISC_DPRINTF("Read config %2.2x\n", ret);
         break;
     case MISC_DIAG:
         ret = s->diag;
         MISC_DPRINTF("Read diag %2.2x\n", ret);
         break;
     case MISC_MDM:
         ret = s->mctrl;
         MISC_DPRINTF("Read modem control %2.2x\n", ret);
         break;
     default:
         break;
     }
     return ret;
 }

 static CPUReadMemoryFunc *slavio_misc_mem_read[3] = {
     slavio_misc_mem_readb,
     NULL,
     NULL,
 };

 static CPUWriteMemoryFunc *slavio_misc_mem_write[3] = {
     slavio_misc_mem_writeb,
     NULL,
     NULL,
 };

 static void slavio_aux1_mem_writeb(void *opaque, target_phys_addr_t addr,
                                    uint32_t val)
 {
     MiscState *s = opaque;

     MISC_DPRINTF("Write aux1 %2.2x\n", val & 0xff);
     if (val & AUX1_TC) {
         // Send a pulse to floppy terminal count line
         if (s->fdc_tc) {
             qemu_irq_raise(s->fdc_tc);
             qemu_irq_lower(s->fdc_tc);
         }
         val &= ~AUX1_TC;
     }
     s->aux1 = val & 0xff;
 }

 static uint32_t slavio_aux1_mem_readb(void *opaque, target_phys_addr_t addr)
 {
     MiscState *s = opaque;
     uint32_t ret = 0;

     ret = s->aux1;
     MISC_DPRINTF("Read aux1 %2.2x\n", ret);

     return ret;
 }

 static CPUReadMemoryFunc *slavio_aux1_mem_read[3] = {
     slavio_aux1_mem_readb,
     NULL,
     NULL,
 };

 static CPUWriteMemoryFunc *slavio_aux1_mem_write[3] = {
     slavio_aux1_mem_writeb,
     NULL,
     NULL,
 };

 static void slavio_aux2_mem_writeb(void *opaque, target_phys_addr_t addr,
                                    uint32_t val)
 {
     MiscState *s = opaque;

     val &= AUX2_PWRINTCLR | AUX2_PWROFF;
     MISC_DPRINTF("Write aux2 %2.2x\n", val);
     val |= s->aux2 & AUX2_PWRFAIL;
     if (val & AUX2_PWRINTCLR) // Clear Power Fail int
         val &= AUX2_PWROFF;
     s->aux2 = val;
     if (val & AUX2_PWROFF)
         qemu_system_shutdown_request();
     slavio_misc_update_irq(s);
 }

 static uint32_t slavio_aux2_mem_readb(void *opaque, target_phys_addr_t addr)
 {
     MiscState *s = opaque;
     uint32_t ret = 0;

     ret = s->aux2;
     MISC_DPRINTF("Read aux2 %2.2x\n", ret);

     return ret;
 }

 static CPUReadMemoryFunc *slavio_aux2_mem_read[3] = {
     slavio_aux2_mem_readb,
     NULL,
     NULL,
 };

 static CPUWriteMemoryFunc *slavio_aux2_mem_write[3] = {
     slavio_aux2_mem_writeb,
     NULL,
     NULL,
 };

 static void apc_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
 {
     MiscState *s = opaque;

     MISC_DPRINTF("Write power management %2.2x\n", val & 0xff);
     qemu_irq_raise(s->cpu_halt);
 }

 static uint32_t apc_mem_readb(void *opaque, target_phys_addr_t addr)
 {
     uint32_t ret = 0;

     MISC_DPRINTF("Read power management %2.2x\n", ret);
     return ret;
 }

 static CPUReadMemoryFunc *apc_mem_read[3] = {
     apc_mem_readb,
     NULL,
     NULL,
 };

 static CPUWriteMemoryFunc *apc_mem_write[3] = {
     apc_mem_writeb,
     NULL,
     NULL,
 };

 static uint32_t slavio_sysctrl_mem_readl(void *opaque, target_phys_addr_t addr)
 {
     MiscState *s = opaque;
     uint32_t ret = 0, saddr;

     saddr = addr & SYSCTRL_MAXADDR;
     switch (saddr) {
     case 0:
         ret = s->sysctrl;
         break;
     default:
         break;
     }
     MISC_DPRINTF("Read system control reg 0x" TARGET_FMT_plx " = %x\n", addr,
                  ret);
     return ret;
 }

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

     saddr = addr & SYSCTRL_MAXADDR;
     MISC_DPRINTF("Write system control reg 0x" TARGET_FMT_plx " =  %x\n", addr,
                  val);
     switch (saddr) {
     case 0:
         if (val & SYS_RESET) {
             s->sysctrl = SYS_RESETSTAT;
             qemu_system_reset_request();
         }
         break;
     default:
         break;
     }
 }

 static CPUReadMemoryFunc *slavio_sysctrl_mem_read[3] = {
     NULL,
     NULL,
     slavio_sysctrl_mem_readl,
 };

 static CPUWriteMemoryFunc *slavio_sysctrl_mem_write[3] = {
     NULL,
     NULL,
     slavio_sysctrl_mem_writel,
 };

 static uint32_t slavio_led_mem_readw(void *opaque, target_phys_addr_t addr)
 {
     MiscState *s = opaque;
     uint32_t ret = 0, saddr;

     saddr = addr & LED_MAXADDR;
     switch (saddr) {
     case 0:
         ret = s->leds;
         break;
     default:
         break;
     }
     MISC_DPRINTF("Read diagnostic LED reg 0x" TARGET_FMT_plx " = %x\n", addr,
                  ret);
     return ret;
 }

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

     saddr = addr & LED_MAXADDR;
     MISC_DPRINTF("Write diagnostic LED reg 0x" TARGET_FMT_plx " =  %x\n", addr,
                  val);
     switch (saddr) {
     case 0:
         s->leds = val;
         break;
     default:
         break;
     }
 }

 static CPUReadMemoryFunc *slavio_led_mem_read[3] = {
     NULL,
     slavio_led_mem_readw,
     NULL,
 };

 static CPUWriteMemoryFunc *slavio_led_mem_write[3] = {
     NULL,
     slavio_led_mem_writew,
     NULL,
 };

 static void slavio_misc_save(QEMUFile *f, void *opaque)
 {
     MiscState *s = opaque;
     uint32_t tmp = 0;
     uint8_t tmp8;

     qemu_put_be32s(f, &tmp); /* ignored, was IRQ.  */
     qemu_put_8s(f, &s->config);
     qemu_put_8s(f, &s->aux1);
     qemu_put_8s(f, &s->aux2);
     qemu_put_8s(f, &s->diag);
     qemu_put_8s(f, &s->mctrl);
     tmp8 = s->sysctrl & 0xff;
     qemu_put_8s(f, &tmp8);
 }

 static int slavio_misc_load(QEMUFile *f, void *opaque, int version_id)
 {
     MiscState *s = opaque;
     uint32_t tmp;
     uint8_t tmp8;

     if (version_id != 1)
         return -EINVAL;

     qemu_get_be32s(f, &tmp);
     qemu_get_8s(f, &s->config);
     qemu_get_8s(f, &s->aux1);
     qemu_get_8s(f, &s->aux2);
     qemu_get_8s(f, &s->diag);
     qemu_get_8s(f, &s->mctrl);
     qemu_get_8s(f, &tmp8);
     s->sysctrl = (uint32_t)tmp8;
     return 0;
 }

 void *slavio_misc_init(target_phys_addr_t base, target_phys_addr_t power_base,
                        target_phys_addr_t aux1_base,
                        target_phys_addr_t aux2_base, qemu_irq irq,
                        qemu_irq cpu_halt, qemu_irq **fdc_tc)
 {
     int io;
     MiscState *s;

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

     if (base) {
         /* 8 bit registers */
         io = cpu_register_io_memory(0, slavio_misc_mem_read,
                                     slavio_misc_mem_write, s);
         // Slavio control
         cpu_register_physical_memory(base + MISC_CFG, MISC_SIZE, io);
         // Diagnostics
         cpu_register_physical_memory(base + MISC_DIAG, MISC_SIZE, io);
         // Modem control
         cpu_register_physical_memory(base + MISC_MDM, MISC_SIZE, io);

         /* 16 bit registers */
         io = cpu_register_io_memory(0, slavio_led_mem_read,
                                     slavio_led_mem_write, s);
         /* ss600mp diag LEDs */
         cpu_register_physical_memory(base + MISC_LEDS, MISC_SIZE, io);

         /* 32 bit registers */
         io = cpu_register_io_memory(0, slavio_sysctrl_mem_read,
                                     slavio_sysctrl_mem_write, s);
         // System control
         cpu_register_physical_memory(base + MISC_SYS, SYSCTRL_SIZE, io);
     }

     // AUX 1 (Misc System Functions)
     if (aux1_base) {
         io = cpu_register_io_memory(0, slavio_aux1_mem_read,
                                     slavio_aux1_mem_write, s);
         cpu_register_physical_memory(aux1_base, MISC_SIZE, io);
     }

     // AUX 2 (Software Powerdown Control)
     if (aux2_base) {
         io = cpu_register_io_memory(0, slavio_aux2_mem_read,
                                     slavio_aux2_mem_write, s);
         cpu_register_physical_memory(aux2_base, MISC_SIZE, io);
     }

     // Power management (APC) XXX: not a Slavio device
     if (power_base) {
         io = cpu_register_io_memory(0, apc_mem_read, apc_mem_write, s);
         cpu_register_physical_memory(power_base, MISC_SIZE, io);
     }

     s->irq = irq;
     s->cpu_halt = cpu_halt;
     *fdc_tc = &s->fdc_tc;

     register_savevm("slavio_misc", base, 1, slavio_misc_save, slavio_misc_load,
                     s);
     qemu_register_reset(slavio_misc_reset, s);
     slavio_misc_reset(s);

     return s;
 }
	/*
	* QEMU Sparc SLAVIO aux io port emulation
	*
	* Copyright (c) 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 "sysemu.h"

	/* debug misc */
	//#define DEBUG_MISC

	/*
	* This is the auxio port, chip control and system control 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
	*
	* This also includes the PMC CPU idle controller.
	*/

	#ifdef DEBUG_MISC
	#define MISC_DPRINTF(fmt, args...) \
	do { printf("MISC: " fmt , ##args); } while (0)
	#else
	#define MISC_DPRINTF(fmt, args...)
	#endif

	typedef struct MiscState {
	qemu_irq irq;
	uint8_t config;
	uint8_t aux1, aux2;
	uint8_t diag, mctrl;
	uint32_t sysctrl;
	uint16_t leds;
	qemu_irq cpu_halt;
	qemu_irq fdc_tc;
	} MiscState;

	#define MISC_SIZE 1
	#define SYSCTRL_MAXADDR 3
	#define SYSCTRL_SIZE (SYSCTRL_MAXADDR + 1)
	#define LED_MAXADDR 1
	#define LED_SIZE (LED_MAXADDR + 1)

	#define MISC_MASK 0x0fff0000
	#define MISC_LEDS 0x01600000
	#define MISC_CFG 0x01800000
	#define MISC_DIAG 0x01a00000
	#define MISC_MDM 0x01b00000
	#define MISC_SYS 0x01f00000

	#define AUX1_TC 0x02

	#define AUX2_PWROFF 0x01
	#define AUX2_PWRINTCLR 0x02
	#define AUX2_PWRFAIL 0x20

	#define CFG_PWRINTEN 0x08

	#define SYS_RESET 0x01
	#define SYS_RESETSTAT 0x02

	static void slavio_misc_update_irq(void *opaque)
	{
	MiscState *s = opaque;

	if ((s->aux2 & AUX2_PWRFAIL) && (s->config & CFG_PWRINTEN)) {
	MISC_DPRINTF("Raise IRQ\n");
	qemu_irq_raise(s->irq);
	} else {
	MISC_DPRINTF("Lower IRQ\n");
	qemu_irq_lower(s->irq);
	}
	}

	static void slavio_misc_reset(void *opaque)
	{
	MiscState *s = opaque;

	// Diagnostic and system control registers not cleared in reset
	s->config = s->aux1 = s->aux2 = s->mctrl = 0;
	}

	void slavio_set_power_fail(void *opaque, int power_failing)
	{
	MiscState *s = opaque;

	MISC_DPRINTF("Power fail: %d, config: %d\n", power_failing, s->config);
	if (power_failing && (s->config & CFG_PWRINTEN)) {
	s->aux2 \|= AUX2_PWRFAIL;
	} else {
	s->aux2 &= ~AUX2_PWRFAIL;
	}
	slavio_misc_update_irq(s);
	}

	static void slavio_misc_mem_writeb(void *opaque, target_phys_addr_t addr,
	uint32_t val)
	{
	MiscState *s = opaque;

	switch (addr & MISC_MASK) {
	case MISC_CFG:
	MISC_DPRINTF("Write config %2.2x\n", val & 0xff);
	s->config = val & 0xff;
	slavio_misc_update_irq(s);
	break;
	case MISC_DIAG:
	MISC_DPRINTF("Write diag %2.2x\n", val & 0xff);
	s->diag = val & 0xff;
	break;
	case MISC_MDM:
	MISC_DPRINTF("Write modem control %2.2x\n", val & 0xff);
	s->mctrl = val & 0xff;
	break;
	default:
	break;
	}
	}

	static uint32_t slavio_misc_mem_readb(void *opaque, target_phys_addr_t addr)
	{
	MiscState *s = opaque;
	uint32_t ret = 0;

	switch (addr & MISC_MASK) {
	case MISC_CFG:
	ret = s->config;
	MISC_DPRINTF("Read config %2.2x\n", ret);
	break;
	case MISC_DIAG:
	ret = s->diag;
	MISC_DPRINTF("Read diag %2.2x\n", ret);
	break;
	case MISC_MDM:
	ret = s->mctrl;
	MISC_DPRINTF("Read modem control %2.2x\n", ret);
	break;
	default:
	break;
	}
	return ret;
	}

	static CPUReadMemoryFunc *slavio_misc_mem_read[3] = {
	slavio_misc_mem_readb,
	NULL,
	NULL,
	};

	static CPUWriteMemoryFunc *slavio_misc_mem_write[3] = {
	slavio_misc_mem_writeb,
	NULL,
	NULL,
	};

	static void slavio_aux1_mem_writeb(void *opaque, target_phys_addr_t addr,
	uint32_t val)
	{
	MiscState *s = opaque;

	MISC_DPRINTF("Write aux1 %2.2x\n", val & 0xff);
	if (val & AUX1_TC) {
	// Send a pulse to floppy terminal count line
	if (s->fdc_tc) {
	qemu_irq_raise(s->fdc_tc);
	qemu_irq_lower(s->fdc_tc);
	}
	val &= ~AUX1_TC;
	}
	s->aux1 = val & 0xff;
	}

	static uint32_t slavio_aux1_mem_readb(void *opaque, target_phys_addr_t addr)
	{
	MiscState *s = opaque;
	uint32_t ret = 0;

	ret = s->aux1;
	MISC_DPRINTF("Read aux1 %2.2x\n", ret);

	return ret;
	}

	static CPUReadMemoryFunc *slavio_aux1_mem_read[3] = {
	slavio_aux1_mem_readb,
	NULL,
	NULL,
	};

	static CPUWriteMemoryFunc *slavio_aux1_mem_write[3] = {
	slavio_aux1_mem_writeb,
	NULL,
	NULL,
	};

	static void slavio_aux2_mem_writeb(void *opaque, target_phys_addr_t addr,
	uint32_t val)
	{
	MiscState *s = opaque;

	val &= AUX2_PWRINTCLR \| AUX2_PWROFF;
	MISC_DPRINTF("Write aux2 %2.2x\n", val);
	val \|= s->aux2 & AUX2_PWRFAIL;
	if (val & AUX2_PWRINTCLR) // Clear Power Fail int
	val &= AUX2_PWROFF;
	s->aux2 = val;
	if (val & AUX2_PWROFF)
	qemu_system_shutdown_request();
	slavio_misc_update_irq(s);
	}

	static uint32_t slavio_aux2_mem_readb(void *opaque, target_phys_addr_t addr)
	{
	MiscState *s = opaque;
	uint32_t ret = 0;

	ret = s->aux2;
	MISC_DPRINTF("Read aux2 %2.2x\n", ret);

	return ret;
	}

	static CPUReadMemoryFunc *slavio_aux2_mem_read[3] = {
	slavio_aux2_mem_readb,
	NULL,
	NULL,
	};

	static CPUWriteMemoryFunc *slavio_aux2_mem_write[3] = {
	slavio_aux2_mem_writeb,
	NULL,
	NULL,
	};

	static void apc_mem_writeb(void *opaque, target_phys_addr_t addr, uint32_t val)
	{
	MiscState *s = opaque;

	MISC_DPRINTF("Write power management %2.2x\n", val & 0xff);
	qemu_irq_raise(s->cpu_halt);
	}

	static uint32_t apc_mem_readb(void *opaque, target_phys_addr_t addr)
	{
	uint32_t ret = 0;

	MISC_DPRINTF("Read power management %2.2x\n", ret);
	return ret;
	}

	static CPUReadMemoryFunc *apc_mem_read[3] = {
	apc_mem_readb,
	NULL,
	NULL,
	};

	static CPUWriteMemoryFunc *apc_mem_write[3] = {
	apc_mem_writeb,
	NULL,
	NULL,
	};

	static uint32_t slavio_sysctrl_mem_readl(void *opaque, target_phys_addr_t addr)
	{
	MiscState *s = opaque;
	uint32_t ret = 0, saddr;

	saddr = addr & SYSCTRL_MAXADDR;
	switch (saddr) {
	case 0:
	ret = s->sysctrl;
	break;
	default:
	break;
	}
	MISC_DPRINTF("Read system control reg 0x" TARGET_FMT_plx " = %x\n", addr,
	ret);
	return ret;
	}

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

	saddr = addr & SYSCTRL_MAXADDR;
	MISC_DPRINTF("Write system control reg 0x" TARGET_FMT_plx " = %x\n", addr,
	val);
	switch (saddr) {
	case 0:
	if (val & SYS_RESET) {
	s->sysctrl = SYS_RESETSTAT;
	qemu_system_reset_request();
	}
	break;
	default:
	break;
	}
	}

	static CPUReadMemoryFunc *slavio_sysctrl_mem_read[3] = {
	NULL,
	NULL,
	slavio_sysctrl_mem_readl,
	};

	static CPUWriteMemoryFunc *slavio_sysctrl_mem_write[3] = {
	NULL,
	NULL,
	slavio_sysctrl_mem_writel,
	};

	static uint32_t slavio_led_mem_readw(void *opaque, target_phys_addr_t addr)
	{
	MiscState *s = opaque;
	uint32_t ret = 0, saddr;

	saddr = addr & LED_MAXADDR;
	switch (saddr) {
	case 0:
	ret = s->leds;
	break;
	default:
	break;
	}
	MISC_DPRINTF("Read diagnostic LED reg 0x" TARGET_FMT_plx " = %x\n", addr,
	ret);
	return ret;
	}

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

	saddr = addr & LED_MAXADDR;
	MISC_DPRINTF("Write diagnostic LED reg 0x" TARGET_FMT_plx " = %x\n", addr,
	val);
	switch (saddr) {
	case 0:
	s->leds = val;
	break;
	default:
	break;
	}
	}

	static CPUReadMemoryFunc *slavio_led_mem_read[3] = {
	NULL,
	slavio_led_mem_readw,
	NULL,
	};

	static CPUWriteMemoryFunc *slavio_led_mem_write[3] = {
	NULL,
	slavio_led_mem_writew,
	NULL,
	};

	static void slavio_misc_save(QEMUFile f, void opaque)
	{
	MiscState *s = opaque;
	uint32_t tmp = 0;
	uint8_t tmp8;

	qemu_put_be32s(f, &tmp); /* ignored, was IRQ. */
	qemu_put_8s(f, &s->config);
	qemu_put_8s(f, &s->aux1);
	qemu_put_8s(f, &s->aux2);
	qemu_put_8s(f, &s->diag);
	qemu_put_8s(f, &s->mctrl);
	tmp8 = s->sysctrl & 0xff;
	qemu_put_8s(f, &tmp8);
	}

	static int slavio_misc_load(QEMUFile f, void opaque, int version_id)
	{
	MiscState *s = opaque;
	uint32_t tmp;
	uint8_t tmp8;

	if (version_id != 1)
	return -EINVAL;

	qemu_get_be32s(f, &tmp);
	qemu_get_8s(f, &s->config);
	qemu_get_8s(f, &s->aux1);
	qemu_get_8s(f, &s->aux2);
	qemu_get_8s(f, &s->diag);
	qemu_get_8s(f, &s->mctrl);
	qemu_get_8s(f, &tmp8);
	s->sysctrl = (uint32_t)tmp8;
	return 0;
	}

	void *slavio_misc_init(target_phys_addr_t base, target_phys_addr_t power_base,
	target_phys_addr_t aux1_base,
	target_phys_addr_t aux2_base, qemu_irq irq,
	qemu_irq cpu_halt, qemu_irq **fdc_tc)
	{
	int io;
	MiscState *s;

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

	if (base) {
	/* 8 bit registers */
	io = cpu_register_io_memory(0, slavio_misc_mem_read,
	slavio_misc_mem_write, s);
	// Slavio control
	cpu_register_physical_memory(base + MISC_CFG, MISC_SIZE, io);
	// Diagnostics
	cpu_register_physical_memory(base + MISC_DIAG, MISC_SIZE, io);
	// Modem control
	cpu_register_physical_memory(base + MISC_MDM, MISC_SIZE, io);

	/* 16 bit registers */
	io = cpu_register_io_memory(0, slavio_led_mem_read,
	slavio_led_mem_write, s);
	/* ss600mp diag LEDs */
	cpu_register_physical_memory(base + MISC_LEDS, MISC_SIZE, io);

	/* 32 bit registers */
	io = cpu_register_io_memory(0, slavio_sysctrl_mem_read,
	slavio_sysctrl_mem_write, s);
	// System control
	cpu_register_physical_memory(base + MISC_SYS, SYSCTRL_SIZE, io);
	}

	// AUX 1 (Misc System Functions)
	if (aux1_base) {
	io = cpu_register_io_memory(0, slavio_aux1_mem_read,
	slavio_aux1_mem_write, s);
	cpu_register_physical_memory(aux1_base, MISC_SIZE, io);
	}

	// AUX 2 (Software Powerdown Control)
	if (aux2_base) {
	io = cpu_register_io_memory(0, slavio_aux2_mem_read,
	slavio_aux2_mem_write, s);
	cpu_register_physical_memory(aux2_base, MISC_SIZE, io);
	}

	// Power management (APC) XXX: not a Slavio device
	if (power_base) {
	io = cpu_register_io_memory(0, apc_mem_read, apc_mem_write, s);
	cpu_register_physical_memory(power_base, MISC_SIZE, io);
	}

	s->irq = irq;
	s->cpu_halt = cpu_halt;
	*fdc_tc = &s->fdc_tc;

	register_savevm("slavio_misc", base, 1, slavio_misc_save, slavio_misc_load,
	s);
	qemu_register_reset(slavio_misc_reset, s);
	slavio_misc_reset(s);

	return s;
	}