qemu/hw/mips_r4k.c
pbrook aef445bd7e Merge common ISA access routines.
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@2159 c046a42c-6fe2-441c-8c8c-71466251a162
2006-09-18 01:15:29 +00:00

208 lines
5.8 KiB
C

#include "vl.h"
#define BIOS_FILENAME "mips_bios.bin"
//#define BIOS_FILENAME "system.bin"
#define KERNEL_LOAD_ADDR 0x80010000
#define INITRD_LOAD_ADDR 0x80800000
#define VIRT_TO_PHYS_ADDEND (-0x80000000LL)
extern FILE *logfile;
static PITState *pit;
static void pic_irq_request(void *opaque, int level)
{
CPUState *env = first_cpu;
if (level) {
env->CP0_Cause |= 0x00000400;
cpu_interrupt(env, CPU_INTERRUPT_HARD);
} else {
env->CP0_Cause &= ~0x00000400;
cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
}
}
void cpu_mips_irqctrl_init (void)
{
}
/* XXX: do not use a global */
uint32_t cpu_mips_get_random (CPUState *env)
{
static uint32_t seed = 0;
uint32_t idx;
seed = seed * 314159 + 1;
idx = (seed >> 16) % (MIPS_TLB_NB - env->CP0_Wired) + env->CP0_Wired;
return idx;
}
/* MIPS R4K timer */
uint32_t cpu_mips_get_count (CPUState *env)
{
return env->CP0_Count +
(uint32_t)muldiv64(qemu_get_clock(vm_clock),
100 * 1000 * 1000, ticks_per_sec);
}
static void cpu_mips_update_count (CPUState *env, uint32_t count,
uint32_t compare)
{
uint64_t now, next;
uint32_t tmp;
tmp = count;
if (count == compare)
tmp++;
now = qemu_get_clock(vm_clock);
next = now + muldiv64(compare - tmp, ticks_per_sec, 100 * 1000 * 1000);
if (next == now)
next++;
#if 0
if (logfile) {
fprintf(logfile, "%s: 0x%08" PRIx64 " %08x %08x => 0x%08" PRIx64 "\n",
__func__, now, count, compare, next - now);
}
#endif
/* Store new count and compare registers */
env->CP0_Compare = compare;
env->CP0_Count =
count - (uint32_t)muldiv64(now, 100 * 1000 * 1000, ticks_per_sec);
/* Adjust timer */
qemu_mod_timer(env->timer, next);
}
void cpu_mips_store_count (CPUState *env, uint32_t value)
{
cpu_mips_update_count(env, value, env->CP0_Compare);
}
void cpu_mips_store_compare (CPUState *env, uint32_t value)
{
cpu_mips_update_count(env, cpu_mips_get_count(env), value);
env->CP0_Cause &= ~0x00008000;
cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
}
static void mips_timer_cb (void *opaque)
{
CPUState *env;
env = opaque;
#if 0
if (logfile) {
fprintf(logfile, "%s\n", __func__);
}
#endif
cpu_mips_update_count(env, cpu_mips_get_count(env), env->CP0_Compare);
env->CP0_Cause |= 0x00008000;
cpu_interrupt(env, CPU_INTERRUPT_HARD);
}
void cpu_mips_clock_init (CPUState *env)
{
env->timer = qemu_new_timer(vm_clock, &mips_timer_cb, env);
env->CP0_Compare = 0;
cpu_mips_update_count(env, 1, 0);
}
void mips_r4k_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)
{
char buf[1024];
int64_t entry = 0;
unsigned long bios_offset;
int ret;
CPUState *env;
long kernel_size;
env = cpu_init();
register_savevm("cpu", 0, 3, cpu_save, cpu_load, env);
/* allocate RAM */
cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);
/* Try to load a BIOS image. If this fails, we continue regardless,
but initialize the hardware ourselves. When a kernel gets
preloaded we also initialize the hardware, since the BIOS wasn't
run. */
bios_offset = ram_size + vga_ram_size;
snprintf(buf, sizeof(buf), "%s/%s", bios_dir, BIOS_FILENAME);
ret = load_image(buf, phys_ram_base + bios_offset);
if (ret == BIOS_SIZE) {
cpu_register_physical_memory((uint32_t)(0x1fc00000),
BIOS_SIZE, bios_offset | IO_MEM_ROM);
} else {
/* not fatal */
fprintf(stderr, "qemu: Warning, could not load MIPS bios '%s'\n",
buf);
}
kernel_size = 0;
if (kernel_filename) {
kernel_size = load_elf(kernel_filename, VIRT_TO_PHYS_ADDEND, &entry);
if (kernel_size >= 0)
env->PC = entry;
else {
kernel_size = load_image(kernel_filename,
phys_ram_base + KERNEL_LOAD_ADDR + VIRT_TO_PHYS_ADDEND);
if (kernel_size < 0) {
fprintf(stderr, "qemu: could not load kernel '%s'\n",
kernel_filename);
exit(1);
}
env->PC = KERNEL_LOAD_ADDR;
}
/* load initrd */
if (initrd_filename) {
if (load_image(initrd_filename,
phys_ram_base + INITRD_LOAD_ADDR + VIRT_TO_PHYS_ADDEND)
== (target_ulong) -1) {
fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
initrd_filename);
exit(1);
}
}
/* Store command line. */
strcpy (phys_ram_base + (16 << 20) - 256, kernel_cmdline);
/* FIXME: little endian support */
*(int *)(phys_ram_base + (16 << 20) - 260) = tswap32 (0x12345678);
*(int *)(phys_ram_base + (16 << 20) - 264) = tswap32 (ram_size);
}
/* Init internal devices */
cpu_mips_clock_init(env);
cpu_mips_irqctrl_init();
/* Register 64 KB of ISA IO space at 0x14000000 */
isa_mmio_init(0x14000000, 0x00010000);
isa_mem_base = 0x10000000;
isa_pic = pic_init(pic_irq_request, env);
pit = pit_init(0x40, 0);
serial_init(&pic_set_irq_new, isa_pic, 0x3f8, 4, serial_hds[0]);
isa_vga_init(ds, phys_ram_base + ram_size, ram_size,
vga_ram_size);
if (nd_table[0].vlan) {
if (nd_table[0].model == NULL
|| strcmp(nd_table[0].model, "ne2k_isa") == 0) {
isa_ne2000_init(0x300, 9, &nd_table[0]);
} else {
fprintf(stderr, "qemu: Unsupported NIC: %s\n", nd_table[0].model);
exit (1);
}
}
}
QEMUMachine mips_machine = {
"mips",
"mips r4k platform",
mips_r4k_init,
};