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/*
* QEMU/mipssim emulation
*
* Emulates a very simple machine model similiar to the one use by the
* proprietary MIPS emulator.
*/
#include "vl.h"
#ifdef TARGET_WORDS_BIGENDIAN
#define BIOS_FILENAME "mips_bios.bin"
#else
#define BIOS_FILENAME "mipsel_bios.bin"
#endif
#ifdef TARGET_MIPS64
#define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffULL)
#else
#define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffU)
#endif
#define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
static void load_kernel (CPUState *env)
{
int64_t entry, kernel_low, kernel_high;
long kernel_size;
long initrd_size;
ram_addr_t initrd_offset;
kernel_size = load_elf(env->kernel_filename, VIRT_TO_PHYS_ADDEND,
&entry, &kernel_low, &kernel_high);
if (kernel_size >= 0) {
if ((entry & ~0x7fffffffULL) == 0x80000000)
entry = (int32_t)entry;
env->PC[env->current_tc] = entry;
} else {
fprintf(stderr, "qemu: could not load kernel '%s'\n",
env->kernel_filename);
exit(1);
}
/* load initrd */
initrd_size = 0;
initrd_offset = 0;
if (env->initrd_filename) {
initrd_size = get_image_size (env->initrd_filename);
if (initrd_size > 0) {
initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
if (initrd_offset + initrd_size > env->ram_size) {
fprintf(stderr,
"qemu: memory too small for initial ram disk '%s'\n",
env->initrd_filename);
exit(1);
}
initrd_size = load_image(env->initrd_filename,
phys_ram_base + initrd_offset);
}
if (initrd_size == (target_ulong) -1) {
fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
env->initrd_filename);
exit(1);
}
}
}
static void main_cpu_reset(void *opaque)
{
CPUState *env = opaque;
cpu_reset(env);
cpu_mips_register(env, NULL);
if (env->kernel_filename)
load_kernel (env);
}
static void
mips_mipssim_init (int ram_size, int vga_ram_size, int boot_device,
DisplayState *ds, const char **fd_filename, int snapshot,
const char *kernel_filename, const char *kernel_cmdline,
const char *initrd_filename, const char *cpu_model)
{
char buf[1024];
unsigned long bios_offset;
CPUState *env;
int bios_size;
mips_def_t *def;
/* Init CPUs. */
if (cpu_model == NULL) {
#ifdef TARGET_MIPS64
cpu_model = "5Kf";
#else
cpu_model = "24Kf";
#endif
}
if (mips_find_by_name(cpu_model, &def) != 0)
def = NULL;
env = cpu_init();
cpu_mips_register(env, def);
register_savevm("cpu", 0, 3, cpu_save, cpu_load, env);
qemu_register_reset(main_cpu_reset, env);
/* Allocate RAM. */
cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);
/* Load a BIOS / boot exception handler image. */
bios_offset = ram_size + vga_ram_size;
if (bios_name == NULL)
bios_name = BIOS_FILENAME;
snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
bios_size = load_image(buf, phys_ram_base + bios_offset);
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",
buf);
exit(1);
} else {
/* Map the BIOS / boot exception handler. */
cpu_register_physical_memory(0x1fc00000LL,
bios_size, bios_offset | IO_MEM_ROM);
/* We have a boot vector start address. */
env->PC[env->current_tc] = (target_long)(int32_t)0xbfc00000;
}
if (kernel_filename) {
env->ram_size = ram_size;
env->kernel_filename = kernel_filename;
env->kernel_cmdline = kernel_cmdline;
env->initrd_filename = initrd_filename;
load_kernel(env);
}
/* Init CPU internal devices. */
cpu_mips_irq_init_cpu(env);
cpu_mips_clock_init(env);
cpu_mips_irqctrl_init();
/* 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], serial_hds[0]);
if (nd_table[0].vlan) {
if (nd_table[0].model == NULL
|| strcmp(nd_table[0].model, "mipsnet") == 0) {
/* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
} else if (strcmp(nd_table[0].model, "?") == 0) {
fprintf(stderr, "qemu: Supported NICs: mipsnet\n");
exit (1);
} else {
fprintf(stderr, "qemu: Unsupported NIC: %s\n", nd_table[0].model);
exit (1);
}
}
}
QEMUMachine mips_mipssim_machine = {
"mipssim",
"MIPS MIPSsim platform",
mips_mipssim_init,
};
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