mips_r4k.c 7.9 KB
Newer Older
bellard's avatar
bellard committed
1 2 3 4 5 6 7
#include "vl.h"

#define BIOS_FILENAME "mips_bios.bin"
//#define BIOS_FILENAME "system.bin"
#define KERNEL_LOAD_ADDR 0x80010000
#define INITRD_LOAD_ADDR 0x80800000

bellard's avatar
bellard committed
8 9
#define VIRT_TO_PHYS_ADDEND (-0x80000000LL)

pbrook's avatar
pbrook committed
10 11 12 13
static const int ide_iobase[2] = { 0x1f0, 0x170 };
static const int ide_iobase2[2] = { 0x3f6, 0x376 };
static const int ide_irq[2] = { 14, 15 };

bellard's avatar
bellard committed
14 15
extern FILE *logfile;

bellard's avatar
bellard committed
16 17
static PITState *pit;

bellard's avatar
bellard committed
18
static void pic_irq_request(void *opaque, int level)
bellard's avatar
bellard committed
19
{
bellard's avatar
bellard committed
20
    CPUState *env = first_cpu;
bellard's avatar
bellard committed
21
    if (level) {
bellard's avatar
bellard committed
22 23
        env->CP0_Cause |= 0x00000400;
        cpu_interrupt(env, CPU_INTERRUPT_HARD);
bellard's avatar
bellard committed
24
    } else {
bellard's avatar
bellard committed
25 26
	env->CP0_Cause &= ~0x00000400;
        cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
bellard's avatar
bellard committed
27 28 29 30 31 32 33
    }
}

void cpu_mips_irqctrl_init (void)
{
}

34
/* XXX: do not use a global */
bellard's avatar
bellard committed
35 36
uint32_t cpu_mips_get_random (CPUState *env)
{
37 38 39 40 41
    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;
bellard's avatar
bellard committed
42 43
}

bellard's avatar
bellard committed
44
/* MIPS R4K timer */
bellard's avatar
bellard committed
45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
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++;
65
#if 0
bellard's avatar
bellard committed
66
    if (logfile) {
bellard's avatar
bellard committed
67
        fprintf(logfile, "%s: 0x%08" PRIx64 " %08x %08x => 0x%08" PRIx64 "\n",
bellard's avatar
bellard committed
68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86
                __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);
bellard's avatar
bellard committed
87 88
    env->CP0_Cause &= ~0x00008000;
    cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
bellard's avatar
bellard committed
89 90 91 92 93 94 95
}

static void mips_timer_cb (void *opaque)
{
    CPUState *env;

    env = opaque;
96
#if 0
bellard's avatar
bellard committed
97 98 99 100 101
    if (logfile) {
        fprintf(logfile, "%s\n", __func__);
    }
#endif
    cpu_mips_update_count(env, cpu_mips_get_count(env), env->CP0_Compare);
bellard's avatar
bellard committed
102 103
    env->CP0_Cause |= 0x00008000;
    cpu_interrupt(env, CPU_INTERRUPT_HARD);
bellard's avatar
bellard committed
104 105 106 107 108 109 110 111 112
}

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);
}

113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199
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;

void load_kernel (CPUState *env, int ram_size, const char *kernel_filename,
		  const char *kernel_cmdline,
		  const char *initrd_filename)
{
    int64_t entry = 0;
    long kernel_size, initrd_size;

    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 */
    initrd_size = 0;
    if (initrd_filename) {
        initrd_size = load_image(initrd_filename,
                                 phys_ram_base + INITRD_LOAD_ADDR + VIRT_TO_PHYS_ADDEND);
        if (initrd_size == (target_ulong) -1) {
            fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
                    initrd_filename);
            exit(1);
        }
    }

    /* Store command line.  */
    if (initrd_size > 0) {
        int ret;
        ret = sprintf(phys_ram_base + (16 << 20) - 256,
                      "rd_start=0x%08x rd_size=%li ",
                      INITRD_LOAD_ADDR,
                      initrd_size);
        strcpy (phys_ram_base + (16 << 20) - 256 + ret, kernel_cmdline);
    }
    else {
        strcpy (phys_ram_base + (16 << 20) - 256, kernel_cmdline);
    }

    *(int *)(phys_ram_base + (16 << 20) - 260) = tswap32 (0x12345678);
    *(int *)(phys_ram_base + (16 << 20) - 264) = tswap32 (ram_size);
}

static void main_cpu_reset(void *opaque)
{
    CPUState *env = opaque;
    cpu_reset(env);

    if (env->kernel_filename)
        load_kernel (env, env->ram_size, env->kernel_filename,
                     env->kernel_cmdline, env->initrd_filename);
}
bellard's avatar
bellard committed
200

bellard's avatar
bellard committed
201 202 203 204 205 206 207 208
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];
    unsigned long bios_offset;
    int ret;
bellard's avatar
bellard committed
209
    CPUState *env;
pbrook's avatar
pbrook committed
210
    int i;
bellard's avatar
bellard committed
211 212 213

    env = cpu_init();
    register_savevm("cpu", 0, 3, cpu_save, cpu_load, env);
214
    qemu_register_reset(main_cpu_reset, env);
bellard's avatar
bellard committed
215

bellard's avatar
bellard committed
216 217
    /* allocate RAM */
    cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);
bellard's avatar
bellard committed
218

219 220 221 222 223 224
    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);

bellard's avatar
bellard committed
225 226 227 228
    /* 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. */
bellard's avatar
bellard committed
229 230 231
    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);
bellard's avatar
bellard committed
232 233 234 235 236 237 238
    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);
bellard's avatar
bellard committed
239
    }
bellard's avatar
bellard committed
240 241

    if (kernel_filename) {
242 243 244 245 246 247
        load_kernel (env, ram_size, kernel_filename, kernel_cmdline,
		     initrd_filename);
	env->ram_size = ram_size;
	env->kernel_filename = kernel_filename;
	env->kernel_cmdline = kernel_cmdline;
	env->initrd_filename = initrd_filename;
bellard's avatar
bellard committed
248 249 250
    }

    /* Init internal devices */
bellard's avatar
bellard committed
251
    cpu_mips_clock_init(env);
bellard's avatar
bellard committed
252 253
    cpu_mips_irqctrl_init();

bellard's avatar
bellard committed
254
    /* Register 64 KB of ISA IO space at 0x14000000 */
pbrook's avatar
pbrook committed
255
    isa_mmio_init(0x14000000, 0x00010000);
bellard's avatar
bellard committed
256 257
    isa_mem_base = 0x10000000;

bellard's avatar
bellard committed
258
    isa_pic = pic_init(pic_irq_request, env);
bellard's avatar
bellard committed
259
    pit = pit_init(0x40, 0);
260
    serial_init(&pic_set_irq_new, isa_pic, 0x3f8, 4, serial_hds[0]);
bellard's avatar
bellard committed
261 262
    isa_vga_init(ds, phys_ram_base + ram_size, ram_size, 
                 vga_ram_size);
bellard's avatar
bellard committed
263

264 265 266 267 268 269 270 271 272
    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);
        }
    }
pbrook's avatar
pbrook committed
273 274 275 276

    for(i = 0; i < 2; i++)
        isa_ide_init(ide_iobase[i], ide_iobase2[i], ide_irq[i],
                     bs_table[2 * i], bs_table[2 * i + 1]);
bellard's avatar
bellard committed
277 278 279 280 281 282 283
}

QEMUMachine mips_machine = {
    "mips",
    "mips r4k platform",
    mips_r4k_init,
};