integratorcp.c

qemu虚拟机代码

/* 
 * ARM Integrator CP System emulation.
 *
 * Copyright (c) 2005-2006 CodeSourcery.
 * Written by Paul Brook
 *
 * This code is licenced under the GPL
 */

#include "vl.h"
#include "arm_pic.h"

void DMA_run (void)
{
}

typedef struct {
    uint32_t flash_offset;
    uint32_t cm_osc;
    uint32_t cm_ctrl;
    uint32_t cm_lock;
    uint32_t cm_auxosc;
    uint32_t cm_sdram;
    uint32_t cm_init;
    uint32_t cm_flags;
    uint32_t cm_nvflags;
    uint32_t int_level;
    uint32_t irq_enabled;
    uint32_t fiq_enabled;
} integratorcm_state;

static uint8_t integrator_spd[128] = {
   128, 8, 4, 11, 9, 1, 64, 0,  2, 0xa0, 0xa0, 0, 0, 8, 0, 1,
   0xe, 4, 0x1c, 1, 2, 0x20, 0xc0, 0, 0, 0, 0, 0x30, 0x28, 0x30, 0x28, 0x40
};

static uint32_t integratorcm_read(void *opaque, target_phys_addr_t offset)
{
    integratorcm_state *s = (integratorcm_state *)opaque;
    offset -= 0x10000000;
    if (offset >= 0x100 && offset < 0x200) {
        /* CM_SPD */
        if (offset >= 0x180)
            return 0;
        return integrator_spd[offset >> 2];
    }
    switch (offset >> 2) {
    case 0: /* CM_ID */
        return 0x411a3001;
    case 1: /* CM_PROC */
        return 0;
    case 2: /* CM_OSC */
        return s->cm_osc;
    case 3: /* CM_CTRL */
        return s->cm_ctrl;
    case 4: /* CM_STAT */
        return 0x00100000;
    case 5: /* CM_LOCK */
        if (s->cm_lock == 0xa05f) {
            return 0x1a05f;
        } else {
            return s->cm_lock;
        }
    case 6: /* CM_LMBUSCNT */
        /* ??? High frequency timer.  */
        cpu_abort(cpu_single_env, "integratorcm_read: CM_LMBUSCNT");
    case 7: /* CM_AUXOSC */
        return s->cm_auxosc;
    case 8: /* CM_SDRAM */
        return s->cm_sdram;
    case 9: /* CM_INIT */
        return s->cm_init;
    case 10: /* CM_REFCT */
        /* ??? High frequency timer.  */
        cpu_abort(cpu_single_env, "integratorcm_read: CM_REFCT");
    case 12: /* CM_FLAGS */
        return s->cm_flags;
    case 14: /* CM_NVFLAGS */
        return s->cm_nvflags;
    case 16: /* CM_IRQ_STAT */
        return s->int_level & s->irq_enabled;
    case 17: /* CM_IRQ_RSTAT */
        return s->int_level;
    case 18: /* CM_IRQ_ENSET */
        return s->irq_enabled;
    case 20: /* CM_SOFT_INTSET */
        return s->int_level & 1;
    case 24: /* CM_FIQ_STAT */
        return s->int_level & s->fiq_enabled;
    case 25: /* CM_FIQ_RSTAT */
        return s->int_level;
    case 26: /* CM_FIQ_ENSET */
        return s->fiq_enabled;
    case 32: /* CM_VOLTAGE_CTL0 */
    case 33: /* CM_VOLTAGE_CTL1 */
    case 34: /* CM_VOLTAGE_CTL2 */
    case 35: /* CM_VOLTAGE_CTL3 */
        /* ??? Voltage control unimplemented.  */
        return 0;
    default:
        cpu_abort (cpu_single_env,
            "integratorcm_read: Unimplemented offset 0x%x\n", offset);
        return 0;
    }
}

static void integratorcm_do_remap(integratorcm_state *s, int flash)
{
    if (flash) {
        cpu_register_physical_memory(0, 0x100000, IO_MEM_RAM);
    } else {
        cpu_register_physical_memory(0, 0x100000, s->flash_offset | IO_MEM_RAM);
    }
    //??? tlb_flush (cpu_single_env, 1);
}

static void integratorcm_set_ctrl(integratorcm_state *s, uint32_t value)
{
    if (value & 8) {
        cpu_abort(cpu_single_env, "Board reset\n");
    }
    if ((s->cm_init ^ value) & 4) {
        integratorcm_do_remap(s, (value & 4) == 0);
    }
    if ((s->cm_init ^ value) & 1) {
        printf("Green LED %s\n", (value & 1) ? "on" : "off");
    }
    s->cm_init = (s->cm_init & ~ 5) | (value ^ 5);
}

static void integratorcm_update(integratorcm_state *s)
{
    /* ??? The CPU irq/fiq is raised when either the core module or base PIC
       are active.  */
    if (s->int_level & (s->irq_enabled | s->fiq_enabled))
        cpu_abort(cpu_single_env, "Core module interrupt\n");
}

static void integratorcm_write(void *opaque, target_phys_addr_t offset,
                               uint32_t value)
{
    integratorcm_state *s = (integratorcm_state *)opaque;
    offset -= 0x10000000;
    switch (offset >> 2) {
    case 2: /* CM_OSC */
        if (s->cm_lock == 0xa05f)
            s->cm_osc = value;
        break;
    case 3: /* CM_CTRL */
        integratorcm_set_ctrl(s, value);
        break;
    case 5: /* CM_LOCK */
        s->cm_lock = value & 0xffff;
        break;
    case 7: /* CM_AUXOSC */
        if (s->cm_lock == 0xa05f)
            s->cm_auxosc = value;
        break;
    case 8: /* CM_SDRAM */
        s->cm_sdram = value;
        break;
    case 9: /* CM_INIT */
        /* ??? This can change the memory bus frequency.  */
        s->cm_init = value;
        break;
    case 12: /* CM_FLAGSS */
        s->cm_flags |= value;
        break;
    case 13: /* CM_FLAGSC */
        s->cm_flags &= ~value;
        break;
    case 14: /* CM_NVFLAGSS */
        s->cm_nvflags |= value;
        break;
    case 15: /* CM_NVFLAGSS */
        s->cm_nvflags &= ~value;
        break;
    case 18: /* CM_IRQ_ENSET */
        s->irq_enabled |= value;
        integratorcm_update(s);
        break;
    case 19: /* CM_IRQ_ENCLR */
        s->irq_enabled &= ~value;
        integratorcm_update(s);
        break;
    case 20: /* CM_SOFT_INTSET */
        s->int_level |= (value & 1);
        integratorcm_update(s);
        break;
    case 21: /* CM_SOFT_INTCLR */
        s->int_level &= ~(value & 1);
        integratorcm_update(s);
        break;
    case 26: /* CM_FIQ_ENSET */
        s->fiq_enabled |= value;
        integratorcm_update(s);
        break;
    case 27: /* CM_FIQ_ENCLR */
        s->fiq_enabled &= ~value;
        integratorcm_update(s);
        break;
    case 32: /* CM_VOLTAGE_CTL0 */
    case 33: /* CM_VOLTAGE_CTL1 */
    case 34: /* CM_VOLTAGE_CTL2 */
    case 35: /* CM_VOLTAGE_CTL3 */
        /* ??? Voltage control unimplemented.  */
        break;
    default:
        cpu_abort (cpu_single_env,
            "integratorcm_write: Unimplemented offset 0x%x\n", offset);
        break;
    }
}

/* Integrator/CM control registers.  */

static CPUReadMemoryFunc *integratorcm_readfn[] = {
   integratorcm_read,
   integratorcm_read,
   integratorcm_read
};

static CPUWriteMemoryFunc *integratorcm_writefn[] = {
   integratorcm_write,
   integratorcm_write,
   integratorcm_write
};

static void integratorcm_init(int memsz, uint32_t flash_offset)
{
    int iomemtype;
    integratorcm_state *s;

    s = (integratorcm_state *)qemu_mallocz(sizeof(integratorcm_state));
    s->cm_osc = 0x01000048;
    /* ??? What should the high bits of this value be?  */
    s->cm_auxosc = 0x0007feff;
    s->cm_sdram = 0x00011122;
    if (memsz >= 256) {
        integrator_spd[31] = 64;
        s->cm_sdram |= 0x10;
    } else if (memsz >= 128) {
        integrator_spd[31] = 32;
        s->cm_sdram |= 0x0c;
    } else if (memsz >= 64) {
        integrator_spd[31] = 16;
        s->cm_sdram |= 0x08;
    } else if (memsz >= 32) {
        integrator_spd[31] = 4;
        s->cm_sdram |= 0x04;
    } else {
        integrator_spd[31] = 2;
    }
    memcpy(integrator_spd + 73, "QEMU-MEMORY", 11);
    s->cm_init = 0x00000112;
    s->flash_offset = flash_offset;

    iomemtype = cpu_register_io_memory(0, integratorcm_readfn,
                                       integratorcm_writefn, s);
    cpu_register_physical_memory(0x10000000, 0x007fffff, iomemtype);
    integratorcm_do_remap(s, 1);
    /* ??? Save/restore.  */
}

/* Integrator/CP hardware emulation.  */
/* Primary interrupt controller.  */

typedef struct icp_pic_state
{
  arm_pic_handler handler;
  uint32_t base;
  uint32_t level;
  uint32_t irq_enabled;
  uint32_t fiq_enabled;