314 lines
9.1 KiB
C
314 lines
9.1 KiB
C
/*
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* QEMU/MIPS pseudo-board
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*
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* emulates a simple machine with ISA-like bus.
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* ISA IO space mapped to the 0x14000000 (PHYS) and
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* ISA memory at the 0x10000000 (PHYS, 16Mb in size).
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* All peripherial devices are attached to this "bus" with
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* the standard PC ISA addresses.
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*/
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#include "hw/hw.h"
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#include "hw/mips.h"
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#include "hw/mips_cpudevs.h"
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#include "hw/pc.h"
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#include "hw/serial.h"
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#include "hw/isa.h"
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#include "net/net.h"
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#include "sysemu/sysemu.h"
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#include "hw/boards.h"
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#include "hw/flash.h"
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#include "qemu/log.h"
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#include "hw/mips-bios.h"
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#include "hw/ide.h"
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#include "hw/loader.h"
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#include "elf.h"
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#include "hw/mc146818rtc.h"
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#include "hw/i8254.h"
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#include "sysemu/blockdev.h"
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#include "exec/address-spaces.h"
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#define MAX_IDE_BUS 2
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static const int ide_iobase[2] = { 0x1f0, 0x170 };
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static const int ide_iobase2[2] = { 0x3f6, 0x376 };
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static const int ide_irq[2] = { 14, 15 };
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static ISADevice *pit; /* PIT i8254 */
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/* i8254 PIT is attached to the IRQ0 at PIC i8259 */
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static struct _loaderparams {
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int ram_size;
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const char *kernel_filename;
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const char *kernel_cmdline;
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const char *initrd_filename;
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} loaderparams;
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static void mips_qemu_write (void *opaque, hwaddr addr,
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uint64_t val, unsigned size)
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{
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if ((addr & 0xffff) == 0 && val == 42)
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qemu_system_reset_request ();
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else if ((addr & 0xffff) == 4 && val == 42)
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qemu_system_shutdown_request ();
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}
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static uint64_t mips_qemu_read (void *opaque, hwaddr addr,
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unsigned size)
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{
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return 0;
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}
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static const MemoryRegionOps mips_qemu_ops = {
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.read = mips_qemu_read,
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.write = mips_qemu_write,
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.endianness = DEVICE_NATIVE_ENDIAN,
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};
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typedef struct ResetData {
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MIPSCPU *cpu;
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uint64_t vector;
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} ResetData;
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static int64_t load_kernel(void)
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{
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int64_t entry, kernel_high;
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long kernel_size, initrd_size, params_size;
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ram_addr_t initrd_offset;
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uint32_t *params_buf;
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int big_endian;
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#ifdef TARGET_WORDS_BIGENDIAN
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big_endian = 1;
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#else
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big_endian = 0;
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#endif
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kernel_size = load_elf(loaderparams.kernel_filename, cpu_mips_kseg0_to_phys,
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NULL, (uint64_t *)&entry, NULL,
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(uint64_t *)&kernel_high, big_endian,
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ELF_MACHINE, 1);
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if (kernel_size >= 0) {
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if ((entry & ~0x7fffffffULL) == 0x80000000)
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entry = (int32_t)entry;
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} else {
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fprintf(stderr, "qemu: could not load kernel '%s'\n",
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loaderparams.kernel_filename);
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exit(1);
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}
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/* load initrd */
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initrd_size = 0;
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initrd_offset = 0;
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if (loaderparams.initrd_filename) {
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initrd_size = get_image_size (loaderparams.initrd_filename);
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if (initrd_size > 0) {
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initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
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if (initrd_offset + initrd_size > ram_size) {
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fprintf(stderr,
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"qemu: memory too small for initial ram disk '%s'\n",
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loaderparams.initrd_filename);
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exit(1);
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}
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initrd_size = load_image_targphys(loaderparams.initrd_filename,
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initrd_offset,
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ram_size - initrd_offset);
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}
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if (initrd_size == (target_ulong) -1) {
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fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
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loaderparams.initrd_filename);
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exit(1);
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}
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}
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/* Store command line. */
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params_size = 264;
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params_buf = g_malloc(params_size);
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params_buf[0] = tswap32(ram_size);
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params_buf[1] = tswap32(0x12345678);
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if (initrd_size > 0) {
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snprintf((char *)params_buf + 8, 256, "rd_start=0x%" PRIx64 " rd_size=%li %s",
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cpu_mips_phys_to_kseg0(NULL, initrd_offset),
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initrd_size, loaderparams.kernel_cmdline);
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} else {
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snprintf((char *)params_buf + 8, 256, "%s", loaderparams.kernel_cmdline);
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}
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rom_add_blob_fixed("params", params_buf, params_size,
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(16 << 20) - 264);
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return entry;
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}
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static void main_cpu_reset(void *opaque)
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{
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ResetData *s = (ResetData *)opaque;
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CPUMIPSState *env = &s->cpu->env;
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cpu_reset(CPU(s->cpu));
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env->active_tc.PC = s->vector;
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}
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static const int sector_len = 32 * 1024;
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static
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void mips_r4k_init(QEMUMachineInitArgs *args)
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{
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ram_addr_t ram_size = args->ram_size;
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const char *cpu_model = args->cpu_model;
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const char *kernel_filename = args->kernel_filename;
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const char *kernel_cmdline = args->kernel_cmdline;
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const char *initrd_filename = args->initrd_filename;
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char *filename;
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MemoryRegion *address_space_mem = get_system_memory();
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MemoryRegion *ram = g_new(MemoryRegion, 1);
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MemoryRegion *bios;
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MemoryRegion *iomem = g_new(MemoryRegion, 1);
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int bios_size;
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MIPSCPU *cpu;
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CPUMIPSState *env;
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ResetData *reset_info;
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int i;
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qemu_irq *i8259;
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ISABus *isa_bus;
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DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
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DriveInfo *dinfo;
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int be;
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/* init CPUs */
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if (cpu_model == NULL) {
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#ifdef TARGET_MIPS64
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cpu_model = "R4000";
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#else
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cpu_model = "24Kf";
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#endif
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}
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cpu = cpu_mips_init(cpu_model);
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if (cpu == NULL) {
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fprintf(stderr, "Unable to find CPU definition\n");
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exit(1);
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}
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env = &cpu->env;
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reset_info = g_malloc0(sizeof(ResetData));
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reset_info->cpu = cpu;
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reset_info->vector = env->active_tc.PC;
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qemu_register_reset(main_cpu_reset, reset_info);
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/* allocate RAM */
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if (ram_size > (256 << 20)) {
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fprintf(stderr,
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"qemu: Too much memory for this machine: %d MB, maximum 256 MB\n",
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((unsigned int)ram_size / (1 << 20)));
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exit(1);
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}
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memory_region_init_ram(ram, "mips_r4k.ram", ram_size);
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vmstate_register_ram_global(ram);
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memory_region_add_subregion(address_space_mem, 0, ram);
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memory_region_init_io(iomem, &mips_qemu_ops, NULL, "mips-qemu", 0x10000);
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memory_region_add_subregion(address_space_mem, 0x1fbf0000, iomem);
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/* Try to load a BIOS image. If this fails, we continue regardless,
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but initialize the hardware ourselves. When a kernel gets
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preloaded we also initialize the hardware, since the BIOS wasn't
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run. */
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if (bios_name == NULL)
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bios_name = BIOS_FILENAME;
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filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
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if (filename) {
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bios_size = get_image_size(filename);
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} else {
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bios_size = -1;
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}
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#ifdef TARGET_WORDS_BIGENDIAN
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be = 1;
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#else
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be = 0;
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#endif
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if ((bios_size > 0) && (bios_size <= BIOS_SIZE)) {
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bios = g_new(MemoryRegion, 1);
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memory_region_init_ram(bios, "mips_r4k.bios", BIOS_SIZE);
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vmstate_register_ram_global(bios);
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memory_region_set_readonly(bios, true);
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memory_region_add_subregion(get_system_memory(), 0x1fc00000, bios);
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load_image_targphys(filename, 0x1fc00000, BIOS_SIZE);
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} else if ((dinfo = drive_get(IF_PFLASH, 0, 0)) != NULL) {
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uint32_t mips_rom = 0x00400000;
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if (!pflash_cfi01_register(0x1fc00000, NULL, "mips_r4k.bios", mips_rom,
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dinfo->bdrv, sector_len,
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mips_rom / sector_len,
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4, 0, 0, 0, 0, be)) {
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fprintf(stderr, "qemu: Error registering flash memory.\n");
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}
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}
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else {
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/* not fatal */
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fprintf(stderr, "qemu: Warning, could not load MIPS bios '%s'\n",
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bios_name);
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}
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if (filename) {
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g_free(filename);
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}
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if (kernel_filename) {
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loaderparams.ram_size = ram_size;
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loaderparams.kernel_filename = kernel_filename;
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loaderparams.kernel_cmdline = kernel_cmdline;
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loaderparams.initrd_filename = initrd_filename;
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reset_info->vector = load_kernel();
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}
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/* Init CPU internal devices */
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cpu_mips_irq_init_cpu(env);
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cpu_mips_clock_init(env);
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/* The PIC is attached to the MIPS CPU INT0 pin */
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isa_bus = isa_bus_new(NULL, get_system_io());
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i8259 = i8259_init(isa_bus, env->irq[2]);
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isa_bus_irqs(isa_bus, i8259);
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rtc_init(isa_bus, 2000, NULL);
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/* Register 64 KB of ISA IO space at 0x14000000 */
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isa_mmio_init(0x14000000, 0x00010000);
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isa_mem_base = 0x10000000;
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pit = pit_init(isa_bus, 0x40, 0, NULL);
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for(i = 0; i < MAX_SERIAL_PORTS; i++) {
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if (serial_hds[i]) {
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serial_isa_init(isa_bus, i, serial_hds[i]);
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}
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}
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isa_vga_init(isa_bus);
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if (nd_table[0].used)
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isa_ne2000_init(isa_bus, 0x300, 9, &nd_table[0]);
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ide_drive_get(hd, MAX_IDE_BUS);
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for(i = 0; i < MAX_IDE_BUS; i++)
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isa_ide_init(isa_bus, ide_iobase[i], ide_iobase2[i], ide_irq[i],
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hd[MAX_IDE_DEVS * i],
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hd[MAX_IDE_DEVS * i + 1]);
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isa_create_simple(isa_bus, "i8042");
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}
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static QEMUMachine mips_machine = {
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.name = "mips",
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.desc = "mips r4k platform",
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.init = mips_r4k_init,
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DEFAULT_MACHINE_OPTIONS,
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};
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static void mips_machine_init(void)
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{
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qemu_register_machine(&mips_machine);
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}
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machine_init(mips_machine_init);
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