mips_r4k.c 7.18 KB
Newer Older
bellard's avatar
bellard committed
1 2 3 4 5 6 7 8 9
#include "vl.h"

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

extern FILE *logfile;

bellard's avatar
bellard committed
10
static void pic_irq_request(void *opaque, int level)
bellard's avatar
bellard committed
11
{
bellard's avatar
bellard committed
12 13 14
    if (level) {
        cpu_single_env->CP0_Cause |= 0x00000400;
        cpu_interrupt(cpu_single_env, CPU_INTERRUPT_HARD);
bellard's avatar
bellard committed
15
    } else {
bellard's avatar
bellard committed
16 17
	cpu_single_env->CP0_Cause &= ~0x00000400;
        cpu_reset_interrupt(cpu_single_env, CPU_INTERRUPT_HARD);
bellard's avatar
bellard committed
18 19 20 21 22 23 24 25 26
    }
}

void cpu_mips_irqctrl_init (void)
{
}

uint32_t cpu_mips_get_random (CPUState *env)
{
bellard's avatar
bellard committed
27
    uint32_t now = qemu_get_clock(vm_clock);
bellard's avatar
bellard committed
28

bellard's avatar
bellard committed
29
    return now % (MIPS_TLB_NB - env->CP0_Wired) + env->CP0_Wired;
bellard's avatar
bellard committed
30 31
}

bellard's avatar
bellard committed
32
/* MIPS R4K timer */
bellard's avatar
bellard committed
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74
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 1
    if (logfile) {
        fprintf(logfile, "%s: 0x%08llx %08x %08x => 0x%08llx\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);
75 76
    cpu_single_env->CP0_Cause &= ~0x00008000;
    cpu_reset_interrupt(cpu_single_env, CPU_INTERRUPT_HARD);
bellard's avatar
bellard committed
77 78 79 80 81 82 83 84 85 86 87 88 89
}

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

    env = opaque;
#if 1
    if (logfile) {
        fprintf(logfile, "%s\n", __func__);
    }
#endif
    cpu_mips_update_count(env, cpu_mips_get_count(env), env->CP0_Compare);
90 91
    cpu_single_env->CP0_Cause |= 0x00008000;
    cpu_interrupt(cpu_single_env, CPU_INTERRUPT_HARD);
bellard's avatar
bellard committed
92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205
}

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);
}

static void io_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
{
    if (logfile)
        fprintf(logfile, "%s: addr %08x val %08x\n", __func__, addr, value);
    cpu_outb(NULL, addr & 0xffff, value);
}

static uint32_t io_readb (void *opaque, target_phys_addr_t addr)
{
    uint32_t ret = cpu_inb(NULL, addr & 0xffff);
    if (logfile)
        fprintf(logfile, "%s: addr %08x val %08x\n", __func__, addr, ret);
    return ret;
}

static void io_writew (void *opaque, target_phys_addr_t addr, uint32_t value)
{
    if (logfile)
        fprintf(logfile, "%s: addr %08x val %08x\n", __func__, addr, value);
#ifdef TARGET_WORDS_BIGENDIAN
    value = bswap16(value);
#endif
    cpu_outw(NULL, addr & 0xffff, value);
}

static uint32_t io_readw (void *opaque, target_phys_addr_t addr)
{
    uint32_t ret = cpu_inw(NULL, addr & 0xffff);
#ifdef TARGET_WORDS_BIGENDIAN
    ret = bswap16(ret);
#endif
    if (logfile)
        fprintf(logfile, "%s: addr %08x val %08x\n", __func__, addr, ret);
    return ret;
}

static void io_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
{
    if (logfile)
        fprintf(logfile, "%s: addr %08x val %08x\n", __func__, addr, value);
#ifdef TARGET_WORDS_BIGENDIAN
    value = bswap32(value);
#endif
    cpu_outl(NULL, addr & 0xffff, value);
}

static uint32_t io_readl (void *opaque, target_phys_addr_t addr)
{
    uint32_t ret = cpu_inl(NULL, addr & 0xffff);

#ifdef TARGET_WORDS_BIGENDIAN
    ret = bswap32(ret);
#endif
    if (logfile)
        fprintf(logfile, "%s: addr %08x val %08x\n", __func__, addr, ret);
    return ret;
}

CPUWriteMemoryFunc *io_write[] = {
    &io_writeb,
    &io_writew,
    &io_writel,
};

CPUReadMemoryFunc *io_read[] = {
    &io_readb,
    &io_readw,
    &io_readl,
};

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];
    target_ulong kernel_base, kernel_size, initrd_base, initrd_size;
    unsigned long bios_offset;
    int io_memory;
    int linux_boot;
    int ret;

    printf("%s: start\n", __func__);
    linux_boot = (kernel_filename != NULL);
    /* allocate RAM */
    cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);
    bios_offset = ram_size + vga_ram_size;
    snprintf(buf, sizeof(buf), "%s/%s", bios_dir, BIOS_FILENAME);
    printf("%s: load BIOS '%s' size %d\n", __func__, buf, BIOS_SIZE);
    ret = load_image(buf, phys_ram_base + bios_offset);
    if (ret != BIOS_SIZE) {
        fprintf(stderr, "qemu: could not load MIPS bios '%s'\n", buf);
        exit(1);
    }
    cpu_register_physical_memory((uint32_t)(0x1fc00000),
                                 BIOS_SIZE, bios_offset | IO_MEM_ROM);
#if 0
    memcpy(phys_ram_base + 0x10000, phys_ram_base + bios_offset, BIOS_SIZE);
    cpu_single_env->PC = 0x80010004;
#else
    cpu_single_env->PC = 0xBFC00004;
#endif
    if (linux_boot) {
        kernel_base = KERNEL_LOAD_ADDR;
        /* now we can load the kernel */
bellard's avatar
bellard committed
206 207 208
        kernel_size = load_image(kernel_filename,
                                phys_ram_base + (kernel_base - 0x80000000));
        if (kernel_size == (target_ulong) -1) {
bellard's avatar
bellard committed
209 210 211 212 213 214 215 216 217
            fprintf(stderr, "qemu: could not load kernel '%s'\n", 
                    kernel_filename);
            exit(1);
        }
        /* load initrd */
        if (initrd_filename) {
            initrd_base = INITRD_LOAD_ADDR;
            initrd_size = load_image(initrd_filename,
                                     phys_ram_base + initrd_base);
bellard's avatar
bellard committed
218
            if (initrd_size == (target_ulong) -1) {
bellard's avatar
bellard committed
219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238
                fprintf(stderr, "qemu: could not load initial ram disk '%s'\n", 
                        initrd_filename);
                exit(1);
            }
        } else {
            initrd_base = 0;
            initrd_size = 0;
        }
        cpu_single_env->PC = KERNEL_LOAD_ADDR;
    } else {
        kernel_base = 0;
        kernel_size = 0;
        initrd_base = 0;
        initrd_size = 0;
    }

    /* Init internal devices */
    cpu_mips_clock_init(cpu_single_env);
    cpu_mips_irqctrl_init();

bellard's avatar
bellard committed
239
    /* Register 64 KB of ISA IO space at 0x14000000 */
bellard's avatar
bellard committed
240
    io_memory = cpu_register_io_memory(0, io_read, io_write, NULL);
bellard's avatar
bellard committed
241 242 243
    cpu_register_physical_memory(0x14000000, 0x00010000, io_memory);
    isa_mem_base = 0x10000000;

bellard's avatar
bellard committed
244
    isa_pic = pic_init(pic_irq_request, cpu_single_env);
bellard's avatar
bellard committed
245
    serial_init(0x3f8, 4, serial_hds[0]);
bellard's avatar
bellard committed
246
    vga_initialize(NULL, ds, phys_ram_base + ram_size, ram_size, 
bellard's avatar
bellard committed
247
                   vga_ram_size, 0, 0);
bellard's avatar
bellard committed
248 249

    isa_ne2000_init(0x300, 9, &nd_table[0]);
bellard's avatar
bellard committed
250 251 252 253 254 255 256
}

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