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/*
* 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/hw.h"
#include "hw/mips/mips.h"
#include "hw/mips/cpudevs.h"
#include "hw/char/serial.h"
#include "hw/isa/isa.h"
#include "net/net.h"
#include "sysemu/sysemu.h"
#include "hw/boards.h"
#include "hw/mips/bios.h"
#include "hw/loader.h"
#include "elf.h"
#include "hw/sysbus.h"
#include "exec/address-spaces.h"
#include "qemu/error-report.h"
#include "sysemu/qtest.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 + ~INITRD_PAGE_MASK) & INITRD_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 *isa = g_new(MemoryRegion, 1);
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, NULL, "mips_mipssim.ram", ram_size);
vmstate_register_ram_global(ram);
memory_region_init_ram(bios, NULL, "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 && !qtest_enabled()) {
/* Bail out if we have neither a kernel image nor boot vector code. */
error_report("Could not load MIPS bios '%s', and no "
"-kernel argument was specified", 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. */
memory_region_init_alias(isa, NULL, "isa_mmio",
get_system_io(), 0, 0x00010000);
memory_region_add_subregion(get_system_memory(), 0x1fd00000, isa);
/* 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,
};
static void mips_mipssim_machine_init(void)
{
qemu_register_machine(&mips_mipssim_machine);
}
machine_init(mips_mipssim_machine_init);
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