240 lines
7.5 KiB
C
240 lines
7.5 KiB
C
/*
|
|
* 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 = sysbus_from_qdev(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,
|
|
};
|
|
|
|
static void mips_mipssim_machine_init(void)
|
|
{
|
|
qemu_register_machine(&mips_mipssim_machine);
|
|
}
|
|
|
|
machine_init(mips_mipssim_machine_init);
|