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xemu/hw/mips_r4k.c
ths eec2743ec2 Allow diskless operation for all mips platforms. 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5001 c046a42c-6fe2-441c-8c8c-71466251a162
2008-08-13 13:01:28 +00:00

292 lines
8.6 KiB
C
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/*
* QEMU/MIPS pseudo-board
*
* emulates a simple machine with ISA-like bus.
* ISA IO space mapped to the 0x14000000 (PHYS) and
* ISA memory at the 0x10000000 (PHYS, 16Mb in size).
* All peripherial devices are attached to this "bus" with
* the standard PC ISA addresses.
*/
#include "hw.h"
#include "mips.h"
#include "pc.h"
#include "isa.h"
#include "net.h"
#include "sysemu.h"
#include "boards.h"
#include "flash.h"
#ifdef TARGET_WORDS_BIGENDIAN
#define BIOS_FILENAME "mips_bios.bin"
#else
#define BIOS_FILENAME "mipsel_bios.bin"
#endif
#define PHYS_TO_VIRT(x) ((x) | ~(target_ulong)0x7fffffff)
#define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
#define MAX_IDE_BUS 2
static const int ide_iobase[2] = { 0x1f0, 0x170 };
static const int ide_iobase2[2] = { 0x3f6, 0x376 };
static const int ide_irq[2] = { 14, 15 };
static int serial_io[MAX_SERIAL_PORTS] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
static int serial_irq[MAX_SERIAL_PORTS] = { 4, 3, 4, 3 };
extern FILE *logfile;
static PITState *pit; /* PIT i8254 */
/* i8254 PIT is attached to the IRQ0 at PIC i8259 */
static struct _loaderparams {
int ram_size;
const char *kernel_filename;
const char *kernel_cmdline;
const char *initrd_filename;
} loaderparams;
static void mips_qemu_writel (void *opaque, target_phys_addr_t addr,
uint32_t val)
{
if ((addr & 0xffff) == 0 && val == 42)
qemu_system_reset_request ();
else if ((addr & 0xffff) == 4 && val == 42)
qemu_system_shutdown_request ();
}
static uint32_t mips_qemu_readl (void *opaque, target_phys_addr_t addr)
{
return 0;
}
static CPUWriteMemoryFunc *mips_qemu_write[] = {
&mips_qemu_writel,
&mips_qemu_writel,
&mips_qemu_writel,
};
static CPUReadMemoryFunc *mips_qemu_read[] = {
&mips_qemu_readl,
&mips_qemu_readl,
&mips_qemu_readl,
};
static int mips_qemu_iomemtype = 0;
static void load_kernel (CPUState *env)
{
int64_t entry, kernel_low, kernel_high;
long kernel_size, initrd_size;
ram_addr_t initrd_offset;
kernel_size = load_elf(loaderparams.kernel_filename, VIRT_TO_PHYS_ADDEND,
&entry, &kernel_low, &kernel_high);
if (kernel_size >= 0) {
if ((entry & ~0x7fffffffULL) == 0x80000000)
entry = (int32_t)entry;
env->active_tc.PC = 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 > ram_size) {
fprintf(stderr,
"qemu: memory too small for initial ram disk '%s'\n",
loaderparams.initrd_filename);
exit(1);
}
initrd_size = load_image(loaderparams.initrd_filename,
phys_ram_base + initrd_offset);
}
if (initrd_size == (target_ulong) -1) {
fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
loaderparams.initrd_filename);
exit(1);
}
}
/* Store command line. */
if (initrd_size > 0) {
int ret;
ret = sprintf(phys_ram_base + (16 << 20) - 256,
"rd_start=0x" TARGET_FMT_lx " rd_size=%li ",
PHYS_TO_VIRT((uint32_t)initrd_offset),
initrd_size);
strcpy (phys_ram_base + (16 << 20) - 256 + ret,
loaderparams.kernel_cmdline);
}
else {
strcpy (phys_ram_base + (16 << 20) - 256,
loaderparams.kernel_cmdline);
}
*(int32_t *)(phys_ram_base + (16 << 20) - 260) = tswap32 (0x12345678);
*(int32_t *)(phys_ram_base + (16 << 20) - 264) = tswap32 (ram_size);
}
static void main_cpu_reset(void *opaque)
{
CPUState *env = opaque;
cpu_reset(env);
if (loaderparams.kernel_filename)
load_kernel (env);
}
static const int sector_len = 32 * 1024;
static
void mips_r4k_init (ram_addr_t ram_size, int vga_ram_size,
const char *boot_device, DisplayState *ds,
const char *kernel_filename, const char *kernel_cmdline,
const char *initrd_filename, const char *cpu_model)
{
char buf[1024];
unsigned long bios_offset;
int bios_size;
CPUState *env;
RTCState *rtc_state;
int i;
qemu_irq *i8259;
int index;
BlockDriverState *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
/* init CPUs */
if (cpu_model == NULL) {
#ifdef TARGET_MIPS64
cpu_model = "R4000";
#else
cpu_model = "24Kf";
#endif
}
env = cpu_init(cpu_model);
if (!env) {
fprintf(stderr, "Unable to find CPU definition\n");
exit(1);
}
qemu_register_reset(main_cpu_reset, env);
/* allocate RAM */
cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);
if (!mips_qemu_iomemtype) {
mips_qemu_iomemtype = cpu_register_io_memory(0, mips_qemu_read,
mips_qemu_write, NULL);
}
cpu_register_physical_memory(0x1fbf0000, 0x10000, mips_qemu_iomemtype);
/* 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;
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)) {
cpu_register_physical_memory(0x1fc00000,
BIOS_SIZE, bios_offset | IO_MEM_ROM);
} else if ((index = drive_get_index(IF_PFLASH, 0, 0)) > -1) {
uint32_t mips_rom = 0x00400000;
cpu_register_physical_memory(0x1fc00000, mips_rom,
qemu_ram_alloc(mips_rom) | IO_MEM_ROM);
if (!pflash_cfi01_register(0x1fc00000, qemu_ram_alloc(mips_rom),
drives_table[index].bdrv, sector_len, mips_rom / sector_len,
4, 0, 0, 0, 0)) {
fprintf(stderr, "qemu: Error registering flash memory.\n");
}
}
else {
/* not fatal */
fprintf(stderr, "qemu: Warning, could not load MIPS bios '%s'\n",
buf);
}
if (kernel_filename) {
loaderparams.ram_size = ram_size;
loaderparams.kernel_filename = kernel_filename;
loaderparams.kernel_cmdline = kernel_cmdline;
loaderparams.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();
/* The PIC is attached to the MIPS CPU INT0 pin */
i8259 = i8259_init(env->irq[2]);
rtc_state = rtc_init(0x70, i8259[8]);
/* Register 64 KB of ISA IO space at 0x14000000 */
isa_mmio_init(0x14000000, 0x00010000);
isa_mem_base = 0x10000000;
pit = pit_init(0x40, i8259[0]);
for(i = 0; i < MAX_SERIAL_PORTS; i++) {
if (serial_hds[i]) {
serial_init(serial_io[i], i8259[serial_irq[i]], 115200,
serial_hds[i]);
}
}
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, i8259[9], &nd_table[0]);
} else if (strcmp(nd_table[0].model, "?") == 0) {
fprintf(stderr, "qemu: Supported NICs: ne2k_isa\n");
exit (1);
} else {
fprintf(stderr, "qemu: Unsupported NIC: %s\n", nd_table[0].model);
exit (1);
}
}
if (drive_get_max_bus(IF_IDE) >= MAX_IDE_BUS) {
fprintf(stderr, "qemu: too many IDE bus\n");
exit(1);
}
for(i = 0; i < MAX_IDE_BUS * MAX_IDE_DEVS; i++) {
index = drive_get_index(IF_IDE, i / MAX_IDE_DEVS, i % MAX_IDE_DEVS);
if (index != -1)
hd[i] = drives_table[index].bdrv;
else
hd[i] = NULL;
}
for(i = 0; i < MAX_IDE_BUS; i++)
isa_ide_init(ide_iobase[i], ide_iobase2[i], i8259[ide_irq[i]],
hd[MAX_IDE_DEVS * i],
hd[MAX_IDE_DEVS * i + 1]);
i8042_init(i8259[1], i8259[12], 0x60);
}
QEMUMachine mips_machine = {
.name = "mips",
.desc = "mips r4k platform",
.init = mips_r4k_init,
.ram_require = VGA_RAM_SIZE + BIOS_SIZE,
.nodisk_ok = 1,
};
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