hw/mips_mipssim.c - qemu - Git at Google

 /*
  * QEMU/mipssim emulation
  *
  * Emulates a very simple machine model similar to the one used by the
  * proprietary MIPS emulator.
  *
  * Copyright (c) 2007 Thiemo Seufer
  *
  * 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 "mips.h"
 #include "mips_cpudevs.h"
 #include "serial.h"
 #include "isa.h"
 #include "net/net.h"
 #include "sysemu/sysemu.h"
 #include "boards.h"
 #include "mips-bios.h"
 #include "loader.h"
 #include "elf.h"
 #include "sysbus.h"
 #include "exec/address-spaces.h"

 static struct _loaderparams {
     int ram_size;
     const char *kernel_filename;
     const char *kernel_cmdline;
     const char *initrd_filename;
 } loaderparams;

 typedef struct ResetData {
     MIPSCPU *cpu;
     uint64_t vector;
 } ResetData;

 static int64_t load_kernel(void)
 {
     int64_t entry, kernel_high;
     long kernel_size;
     long initrd_size;
     ram_addr_t initrd_offset;
     int big_endian;

 #ifdef TARGET_WORDS_BIGENDIAN
     big_endian = 1;
 #else
     big_endian = 0;
 #endif

     kernel_size = load_elf(loaderparams.kernel_filename, cpu_mips_kseg0_to_phys,
                            NULL, (uint64_t *)&entry, NULL,
                            (uint64_t *)&kernel_high, big_endian,
                            ELF_MACHINE, 1);
     if (kernel_size >= 0) {
         if ((entry & ~0x7fffffffULL) == 0x80000000)
             entry = (int32_t)entry;
     } else {
         fprintf(stderr, "qemu: could not load kernel '%s'\n",
                 loaderparams.kernel_filename);
         exit(1);
     }

     /* load initrd */
     initrd_size = 0;
     initrd_offset = 0;
     if (loaderparams.initrd_filename) {
         initrd_size = get_image_size (loaderparams.initrd_filename);
         if (initrd_size > 0) {
             initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
             if (initrd_offset + initrd_size > loaderparams.ram_size) {
                 fprintf(stderr,
                         "qemu: memory too small for initial ram disk '%s'\n",
                         loaderparams.initrd_filename);
                 exit(1);
             }
             initrd_size = load_image_targphys(loaderparams.initrd_filename,
                 initrd_offset, loaderparams.ram_size - initrd_offset);
         }
         if (initrd_size == (target_ulong) -1) {
             fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
                     loaderparams.initrd_filename);
             exit(1);
         }
     }
     return entry;
 }

 static void main_cpu_reset(void *opaque)
 {
     ResetData *s = (ResetData *)opaque;
     CPUMIPSState *env = &s->cpu->env;

     cpu_reset(CPU(s->cpu));
     env->active_tc.PC = s->vector & ~(target_ulong)1;
     if (s->vector & 1) {
         env->hflags |= MIPS_HFLAG_M16;
     }
 }

 static void mipsnet_init(int base, qemu_irq irq, NICInfo *nd)
 {
     DeviceState *dev;
     SysBusDevice *s;

     dev = qdev_create(NULL, "mipsnet");
     qdev_set_nic_properties(dev, nd);
     qdev_init_nofail(dev);

     s = SYS_BUS_DEVICE(dev);
     sysbus_connect_irq(s, 0, irq);
     memory_region_add_subregion(get_system_io(),
                                 base,
                                 sysbus_mmio_get_region(s, 0));
 }

 static void
 mips_mipssim_init(QEMUMachineInitArgs *args)
 {
     ram_addr_t ram_size = args->ram_size;
     const char *cpu_model = args->cpu_model;
     const char *kernel_filename = args->kernel_filename;
     const char *kernel_cmdline = args->kernel_cmdline;
     const char *initrd_filename = args->initrd_filename;
     char *filename;
     MemoryRegion *address_space_mem = get_system_memory();
     MemoryRegion *ram = g_new(MemoryRegion, 1);
     MemoryRegion *bios = g_new(MemoryRegion, 1);
     MIPSCPU *cpu;
     CPUMIPSState *env;
     ResetData *reset_info;
     int bios_size;

     /* Init CPUs. */
     if (cpu_model == NULL) {
 #ifdef TARGET_MIPS64
         cpu_model = "5Kf";
 #else
         cpu_model = "24Kf";
 #endif
     }
     cpu = cpu_mips_init(cpu_model);
     if (cpu == NULL) {
         fprintf(stderr, "Unable to find CPU definition\n");
         exit(1);
     }
     env = &cpu->env;

     reset_info = g_malloc0(sizeof(ResetData));
     reset_info->cpu = cpu;
     reset_info->vector = env->active_tc.PC;
     qemu_register_reset(main_cpu_reset, reset_info);

     /* Allocate RAM. */
     memory_region_init_ram(ram, "mips_mipssim.ram", ram_size);
     vmstate_register_ram_global(ram);
     memory_region_init_ram(bios, "mips_mipssim.bios", BIOS_SIZE);
     vmstate_register_ram_global(bios);
     memory_region_set_readonly(bios, true);

     memory_region_add_subregion(address_space_mem, 0, ram);

     /* Map the BIOS / boot exception handler. */
     memory_region_add_subregion(address_space_mem, 0x1fc00000LL, bios);
     /* Load a BIOS / boot exception handler image. */
     if (bios_name == NULL)
         bios_name = BIOS_FILENAME;
     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
     if (filename) {
         bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE);
         g_free(filename);
     } else {
         bios_size = -1;
     }
     if ((bios_size < 0 || bios_size > BIOS_SIZE) && !kernel_filename) {
         /* Bail out if we have neither a kernel image nor boot vector code. */
         fprintf(stderr,
                 "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
                 filename);
         exit(1);
     } else {
         /* We have a boot vector start address. */
         env->active_tc.PC = (target_long)(int32_t)0xbfc00000;
     }

     if (kernel_filename) {
         loaderparams.ram_size = ram_size;
         loaderparams.kernel_filename = kernel_filename;
         loaderparams.kernel_cmdline = kernel_cmdline;
         loaderparams.initrd_filename = initrd_filename;
         reset_info->vector = load_kernel();
     }

     /* Init CPU internal devices. */
     cpu_mips_irq_init_cpu(env);
     cpu_mips_clock_init(env);

     /* Register 64 KB of ISA IO space at 0x1fd00000. */
     isa_mmio_init(0x1fd00000, 0x00010000);

     /* A single 16450 sits at offset 0x3f8. It is attached to
        MIPS CPU INT2, which is interrupt 4. */
     if (serial_hds[0])
         serial_init(0x3f8, env->irq[4], 115200, serial_hds[0],
                     get_system_io());

     if (nd_table[0].used)
         /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
         mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
 }

 static QEMUMachine mips_mipssim_machine = {
     .name = "mipssim",
     .desc = "MIPS MIPSsim platform",
     .init = mips_mipssim_init,
     DEFAULT_MACHINE_OPTIONS,
 };

 static void mips_mipssim_machine_init(void)
 {
     qemu_register_machine(&mips_mipssim_machine);
 }

 machine_init(mips_mipssim_machine_init);
	/*
	* QEMU/mipssim emulation
	*
	* Emulates a very simple machine model similar to the one used by the
	* proprietary MIPS emulator.
	*
	* Copyright (c) 2007 Thiemo Seufer
	*
	* 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 "mips.h"
	#include "mips_cpudevs.h"
	#include "serial.h"
	#include "isa.h"
	#include "net/net.h"
	#include "sysemu/sysemu.h"
	#include "boards.h"
	#include "mips-bios.h"
	#include "loader.h"
	#include "elf.h"
	#include "sysbus.h"
	#include "exec/address-spaces.h"

	static struct _loaderparams {
	int ram_size;
	const char *kernel_filename;
	const char *kernel_cmdline;
	const char *initrd_filename;
	} loaderparams;

	typedef struct ResetData {
	MIPSCPU *cpu;
	uint64_t vector;
	} ResetData;

	static int64_t load_kernel(void)
	{
	int64_t entry, kernel_high;
	long kernel_size;
	long initrd_size;
	ram_addr_t initrd_offset;
	int big_endian;

	#ifdef TARGET_WORDS_BIGENDIAN
	big_endian = 1;
	#else
	big_endian = 0;
	#endif

	kernel_size = load_elf(loaderparams.kernel_filename, cpu_mips_kseg0_to_phys,
	NULL, (uint64_t *)&entry, NULL,
	(uint64_t *)&kernel_high, big_endian,
	ELF_MACHINE, 1);
	if (kernel_size >= 0) {
	if ((entry & ~0x7fffffffULL) == 0x80000000)
	entry = (int32_t)entry;
	} else {
	fprintf(stderr, "qemu: could not load kernel '%s'\n",
	loaderparams.kernel_filename);
	exit(1);
	}

	/* load initrd */
	initrd_size = 0;
	initrd_offset = 0;
	if (loaderparams.initrd_filename) {
	initrd_size = get_image_size (loaderparams.initrd_filename);
	if (initrd_size > 0) {
	initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
	if (initrd_offset + initrd_size > loaderparams.ram_size) {
	fprintf(stderr,
	"qemu: memory too small for initial ram disk '%s'\n",
	loaderparams.initrd_filename);
	exit(1);
	}
	initrd_size = load_image_targphys(loaderparams.initrd_filename,
	initrd_offset, loaderparams.ram_size - initrd_offset);
	}
	if (initrd_size == (target_ulong) -1) {
	fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
	loaderparams.initrd_filename);
	exit(1);
	}
	}
	return entry;
	}

	static void main_cpu_reset(void *opaque)
	{
	ResetData s = (ResetData )opaque;
	CPUMIPSState *env = &s->cpu->env;

	cpu_reset(CPU(s->cpu));
	env->active_tc.PC = s->vector & ~(target_ulong)1;
	if (s->vector & 1) {
	env->hflags \|= MIPS_HFLAG_M16;
	}
	}

	static void mipsnet_init(int base, qemu_irq irq, NICInfo *nd)
	{
	DeviceState *dev;
	SysBusDevice *s;

	dev = qdev_create(NULL, "mipsnet");
	qdev_set_nic_properties(dev, nd);
	qdev_init_nofail(dev);

	s = SYS_BUS_DEVICE(dev);
	sysbus_connect_irq(s, 0, irq);
	memory_region_add_subregion(get_system_io(),
	base,
	sysbus_mmio_get_region(s, 0));
	}

	static void
	mips_mipssim_init(QEMUMachineInitArgs *args)
	{
	ram_addr_t ram_size = args->ram_size;
	const char *cpu_model = args->cpu_model;
	const char *kernel_filename = args->kernel_filename;
	const char *kernel_cmdline = args->kernel_cmdline;
	const char *initrd_filename = args->initrd_filename;
	char *filename;
	MemoryRegion *address_space_mem = get_system_memory();
	MemoryRegion *ram = g_new(MemoryRegion, 1);
	MemoryRegion *bios = g_new(MemoryRegion, 1);
	MIPSCPU *cpu;
	CPUMIPSState *env;
	ResetData *reset_info;
	int bios_size;

	/* Init CPUs. */
	if (cpu_model == NULL) {
	#ifdef TARGET_MIPS64
	cpu_model = "5Kf";
	#else
	cpu_model = "24Kf";
	#endif
	}
	cpu = cpu_mips_init(cpu_model);
	if (cpu == NULL) {
	fprintf(stderr, "Unable to find CPU definition\n");
	exit(1);
	}
	env = &cpu->env;

	reset_info = g_malloc0(sizeof(ResetData));
	reset_info->cpu = cpu;
	reset_info->vector = env->active_tc.PC;
	qemu_register_reset(main_cpu_reset, reset_info);

	/* Allocate RAM. */
	memory_region_init_ram(ram, "mips_mipssim.ram", ram_size);
	vmstate_register_ram_global(ram);
	memory_region_init_ram(bios, "mips_mipssim.bios", BIOS_SIZE);
	vmstate_register_ram_global(bios);
	memory_region_set_readonly(bios, true);

	memory_region_add_subregion(address_space_mem, 0, ram);

	/* Map the BIOS / boot exception handler. */
	memory_region_add_subregion(address_space_mem, 0x1fc00000LL, bios);
	/* Load a BIOS / boot exception handler image. */
	if (bios_name == NULL)
	bios_name = BIOS_FILENAME;
	filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
	if (filename) {
	bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE);
	g_free(filename);
	} else {
	bios_size = -1;
	}
	if ((bios_size < 0 \|\| bios_size > BIOS_SIZE) && !kernel_filename) {
	/* Bail out if we have neither a kernel image nor boot vector code. */
	fprintf(stderr,
	"qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
	filename);
	exit(1);
	} else {
	/* We have a boot vector start address. */
	env->active_tc.PC = (target_long)(int32_t)0xbfc00000;
	}

	if (kernel_filename) {
	loaderparams.ram_size = ram_size;
	loaderparams.kernel_filename = kernel_filename;
	loaderparams.kernel_cmdline = kernel_cmdline;
	loaderparams.initrd_filename = initrd_filename;
	reset_info->vector = load_kernel();
	}

	/* Init CPU internal devices. */
	cpu_mips_irq_init_cpu(env);
	cpu_mips_clock_init(env);

	/* Register 64 KB of ISA IO space at 0x1fd00000. */
	isa_mmio_init(0x1fd00000, 0x00010000);

	/* A single 16450 sits at offset 0x3f8. It is attached to
	MIPS CPU INT2, which is interrupt 4. */
	if (serial_hds[0])
	serial_init(0x3f8, env->irq[4], 115200, serial_hds[0],
	get_system_io());

	if (nd_table[0].used)
	/* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
	mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
	}

	static QEMUMachine mips_mipssim_machine = {
	.name = "mipssim",
	.desc = "MIPS MIPSsim platform",
	.init = mips_mipssim_init,
	DEFAULT_MACHINE_OPTIONS,
	};

	static void mips_mipssim_machine_init(void)
	{
	qemu_register_machine(&mips_mipssim_machine);
	}

	machine_init(mips_mipssim_machine_init);