Archipelago » qemu

/*

 * QEMU generic PowerPC hardware System Emulator

 * 

 * Copyright (c) 2003-2007 Jocelyn Mayer

 * 

 * Permission is hereby granted, free of charge, to any person obtaining a copy

 * of this software and associated documentation files (the "Software"), to deal

 * in the Software without restriction, including without limitation the rights

 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

 * copies of the Software, and to permit persons to whom the Software is

 * furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL

 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

 * THE SOFTWARE.

 */

#include "vl.h"

#include "m48t59.h"

//#define PPC_DEBUG_IRQ

extern FILE *logfile;

extern int loglevel;

void ppc_set_irq (CPUState *env, int n_IRQ, int level)

{

    if (level) {

        env->pending_interrupts |= 1 << n_IRQ;

        cpu_interrupt(env, CPU_INTERRUPT_HARD);

    } else {

        env->pending_interrupts &= ~(1 << n_IRQ);

        if (env->pending_interrupts == 0)

            cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);

    }

#if defined(PPC_DEBUG_IRQ)

    printf("%s: %p n_IRQ %d level %d => pending %08x req %08x\n", __func__,

           env, n_IRQ, level, env->pending_interrupts, env->interrupt_request);

#endif

}

/* PowerPC 6xx / 7xx internal IRQ controller */

static void ppc6xx_set_irq (void *opaque, int pin, int level)

{

    CPUState *env = opaque;

    int cur_level;

#if defined(PPC_DEBUG_IRQ)

    printf("%s: env %p pin %d level %d\n", __func__, env, pin, level);

#endif

    cur_level = (env->irq_input_state >> pin) & 1;

    /* Don't generate spurious events */

    if ((cur_level == 1 && level == 0) || (cur_level == 0 && level != 0) || 0) {

        switch (pin) {

        case PPC_INPUT_INT:

            /* Level sensitive - asserted high */

#if defined(PPC_DEBUG_IRQ)

            printf("%s: set the external IRQ state to %d\n", __func__, level);

#endif

            ppc_set_irq(env, PPC_INTERRUPT_EXT, level);

            break;

        case PPC_INPUT_SMI:

            /* Level sensitive - active high */

#if defined(PPC_DEBUG_IRQ)

            printf("%s: set the SMI IRQ state to %d\n", __func__, level);

#endif

            ppc_set_irq(env, PPC_INTERRUPT_SMI, level);

            break;

        case PPC_INPUT_MCP:

            /* Negative edge sensitive */

            /* XXX: TODO: actual reaction may depends on HID0 status

             *            603/604/740/750: check HID0[EMCP]

             */

            if (cur_level == 1 && level == 0) {

#if defined(PPC_DEBUG_IRQ)

                printf("%s: raise machine check state\n", __func__);

#endif

                ppc_set_irq(env, PPC_INTERRUPT_MCK, 1);

            }

            break;

        case PPC_INPUT_CKSTP_IN:

            /* Level sensitive - active low */

            /* XXX: TODO: relay the signal to CKSTP_OUT pin */

            if (level) {

#if defined(PPC_DEBUG_IRQ)

                printf("%s: stop the CPU\n", __func__);

#endif

                env->halted = 1;

            } else {

#if defined(PPC_DEBUG_IRQ)

                printf("%s: restart the CPU\n", __func__);

#endif

                env->halted = 0;

            }

            break;

        case PPC_INPUT_HRESET:

            /* Level sensitive - active low */

            if (level) {

#if 0 // XXX: TOFIX

#if defined(PPC_DEBUG_IRQ)

                printf("%s: reset the CPU\n", __func__);

#endif

                cpu_reset(env);

#endif

            }

            break;

        case PPC_INPUT_SRESET:

#if defined(PPC_DEBUG_IRQ)

            printf("%s: set the RESET IRQ state to %d\n", __func__, level);

#endif

            ppc_set_irq(env, PPC_INTERRUPT_RESET, level);

            break;

        default:

            /* Unknown pin - do nothing */

#if defined(PPC_DEBUG_IRQ)

            printf("%s: unknown IRQ pin %d\n", __func__, pin);

#endif

            return;

        }

        if (level)

            env->irq_input_state |= 1 << pin;

        else

            env->irq_input_state &= ~(1 << pin);

    }

}

void ppc6xx_irq_init (CPUState *env)

{

    env->irq_inputs = (void **)qemu_allocate_irqs(&ppc6xx_set_irq, env, 6);

}

/*****************************************************************************/

/* PowerPC time base and decrementer emulation */

//#define DEBUG_TB

struct ppc_tb_t {

    /* Time base management */

    int64_t  tb_offset;    /* Compensation               */

    uint32_t tb_freq;      /* TB frequency               */

    /* Decrementer management */

    uint64_t decr_next;    /* Tick for next decr interrupt  */

    struct QEMUTimer *decr_timer;

    void *opaque;

};

static inline uint64_t cpu_ppc_get_tb (ppc_tb_t *tb_env)

{

    /* TB time in tb periods */

    return muldiv64(qemu_get_clock(vm_clock) + tb_env->tb_offset,

                    tb_env->tb_freq, ticks_per_sec);

}

uint32_t cpu_ppc_load_tbl (CPUState *env)

{

    ppc_tb_t *tb_env = env->tb_env;

    uint64_t tb;

    tb = cpu_ppc_get_tb(tb_env);

#ifdef DEBUG_TB

    {

        static int last_time;

        int now;

        now = time(NULL);

        if (last_time != now) {

            last_time = now;

            printf("%s: tb=0x%016lx %d %08lx\n",

                   __func__, tb, now, tb_env->tb_offset);

        }

    }

#endif

    return tb & 0xFFFFFFFF;

}

uint32_t cpu_ppc_load_tbu (CPUState *env)

{

    ppc_tb_t *tb_env = env->tb_env;

    uint64_t tb;

    tb = cpu_ppc_get_tb(tb_env);

#ifdef DEBUG_TB

    printf("%s: tb=0x%016lx\n", __func__, tb);

#endif

    return tb >> 32;

}

static void cpu_ppc_store_tb (ppc_tb_t *tb_env, uint64_t value)

{

    tb_env->tb_offset = muldiv64(value, ticks_per_sec, tb_env->tb_freq)

        - qemu_get_clock(vm_clock);

#ifdef DEBUG_TB

    printf("%s: tb=0x%016lx offset=%08x\n", __func__, value);

#endif

}

void cpu_ppc_store_tbu (CPUState *env, uint32_t value)

{

    ppc_tb_t *tb_env = env->tb_env;

    cpu_ppc_store_tb(tb_env,

                     ((uint64_t)value << 32) | cpu_ppc_load_tbl(env));

}

void cpu_ppc_store_tbl (CPUState *env, uint32_t value)

{

    ppc_tb_t *tb_env = env->tb_env;

    cpu_ppc_store_tb(tb_env,

                     ((uint64_t)cpu_ppc_load_tbu(env) << 32) | value);

}

uint32_t cpu_ppc_load_decr (CPUState *env)

{

    ppc_tb_t *tb_env = env->tb_env;

    uint32_t decr;

    int64_t diff;

    diff = tb_env->decr_next - qemu_get_clock(vm_clock);

    if (diff >= 0)

        decr = muldiv64(diff, tb_env->tb_freq, ticks_per_sec);

    else

        decr = -muldiv64(-diff, tb_env->tb_freq, ticks_per_sec);

#if defined(DEBUG_TB)

    printf("%s: 0x%08x\n", __func__, decr);

#endif

    return decr;

}

/* When decrementer expires,

 * all we need to do is generate or queue a CPU exception

 */

static inline void cpu_ppc_decr_excp (CPUState *env)

{

    /* Raise it */

#ifdef DEBUG_TB

    printf("raise decrementer exception\n");

#endif

    ppc_set_irq(env, PPC_INTERRUPT_DECR, 1);

}

static void _cpu_ppc_store_decr (CPUState *env, uint32_t decr,

                                 uint32_t value, int is_excp)

{

    ppc_tb_t *tb_env = env->tb_env;

    uint64_t now, next;

#ifdef DEBUG_TB

    printf("%s: 0x%08x => 0x%08x\n", __func__, decr, value);

#endif

    now = qemu_get_clock(vm_clock);

    next = now + muldiv64(value, ticks_per_sec, tb_env->tb_freq);

    if (is_excp)

        next += tb_env->decr_next - now;

    if (next == now)

        next++;

    tb_env->decr_next = next;

    /* Adjust timer */

    qemu_mod_timer(tb_env->decr_timer, next);

    /* If we set a negative value and the decrementer was positive,

     * raise an exception.

     */

    if ((value & 0x80000000) && !(decr & 0x80000000))

        cpu_ppc_decr_excp(env);

}

void cpu_ppc_store_decr (CPUState *env, uint32_t value)

{

    _cpu_ppc_store_decr(env, cpu_ppc_load_decr(env), value, 0);

}

static void cpu_ppc_decr_cb (void *opaque)

{

    _cpu_ppc_store_decr(opaque, 0x00000000, 0xFFFFFFFF, 1);

}

/* Set up (once) timebase frequency (in Hz) */

ppc_tb_t *cpu_ppc_tb_init (CPUState *env, uint32_t freq)

{

    ppc_tb_t *tb_env;

    tb_env = qemu_mallocz(sizeof(ppc_tb_t));

    if (tb_env == NULL)

        return NULL;

    env->tb_env = tb_env;

    if (tb_env->tb_freq == 0 || 1) {

        tb_env->tb_freq = freq;

        /* Create new timer */

        tb_env->decr_timer =

            qemu_new_timer(vm_clock, &cpu_ppc_decr_cb, env);

        /* There is a bug in Linux 2.4 kernels:

         * if a decrementer exception is pending when it enables msr_ee,

         * it's not ready to handle it...

         */

        _cpu_ppc_store_decr(env, 0xFFFFFFFF, 0xFFFFFFFF, 0);

    }

    return tb_env;

}

/* Specific helpers for POWER & PowerPC 601 RTC */

ppc_tb_t *cpu_ppc601_rtc_init (CPUState *env)

{

    return cpu_ppc_tb_init(env, 7812500);

}

void cpu_ppc601_store_rtcu (CPUState *env, uint32_t value)

__attribute__ (( alias ("cpu_ppc_store_tbu") ));

uint32_t cpu_ppc601_load_rtcu (CPUState *env)

__attribute__ (( alias ("cpu_ppc_load_tbu") ));

void cpu_ppc601_store_rtcl (CPUState *env, uint32_t value)

{

    cpu_ppc_store_tbl(env, value & 0x3FFFFF80);

}

uint32_t cpu_ppc601_load_rtcl (CPUState *env)

{

    return cpu_ppc_load_tbl(env) & 0x3FFFFF80;

}

/*****************************************************************************/

/* Embedded PowerPC timers */

/* PIT, FIT & WDT */

typedef struct ppcemb_timer_t ppcemb_timer_t;

struct ppcemb_timer_t {

    uint64_t pit_reload;  /* PIT auto-reload value        */

    uint64_t fit_next;    /* Tick for next FIT interrupt  */

    struct QEMUTimer *fit_timer;

    uint64_t wdt_next;    /* Tick for next WDT interrupt  */

    struct QEMUTimer *wdt_timer;

};

/* Fixed interval timer */

static void cpu_4xx_fit_cb (void *opaque)

{

    CPUState *env;

    ppc_tb_t *tb_env;

    ppcemb_timer_t *ppcemb_timer;

    uint64_t now, next;

    env = opaque;

    tb_env = env->tb_env;

    ppcemb_timer = tb_env->opaque;

    now = qemu_get_clock(vm_clock);

    switch ((env->spr[SPR_40x_TCR] >> 24) & 0x3) {

    case 0:

        next = 1 << 9;

        break;

    case 1:

        next = 1 << 13;

        break;

    case 2:

        next = 1 << 17;

        break;

    case 3:

        next = 1 << 21;

        break;

    default:

        /* Cannot occur, but makes gcc happy */

        return;

    }

    next = now + muldiv64(next, ticks_per_sec, tb_env->tb_freq);

    if (next == now)

        next++;

    qemu_mod_timer(ppcemb_timer->fit_timer, next);

    tb_env->decr_next = next;

    env->spr[SPR_40x_TSR] |= 1 << 26;

    if ((env->spr[SPR_40x_TCR] >> 23) & 0x1)

        ppc_set_irq(env, PPC_INTERRUPT_FIT, 1);

    if (loglevel) {

        fprintf(logfile, "%s: ir %d TCR %08x TSR %08x\n", __func__,

                (env->spr[SPR_40x_TCR] >> 23) & 0x1,

                env->spr[SPR_40x_TCR], env->spr[SPR_40x_TSR]);

    }

}

/* Programmable interval timer */

static void cpu_4xx_pit_cb (void *opaque)

{

    CPUState *env;

    ppc_tb_t *tb_env;

    ppcemb_timer_t *ppcemb_timer;

    uint64_t now, next;

    env = opaque;

    tb_env = env->tb_env;

    ppcemb_timer = tb_env->opaque;

    now = qemu_get_clock(vm_clock);

    if ((env->spr[SPR_40x_TCR] >> 22) & 0x1) {

        /* Auto reload */

        next = now + muldiv64(ppcemb_timer->pit_reload,

                              ticks_per_sec, tb_env->tb_freq);

        if (next == now)

            next++;

        qemu_mod_timer(tb_env->decr_timer, next);

        tb_env->decr_next = next;

    }

    env->spr[SPR_40x_TSR] |= 1 << 27;

    if ((env->spr[SPR_40x_TCR] >> 26) & 0x1)

        ppc_set_irq(env, PPC_INTERRUPT_PIT, 1);

    if (loglevel) {

        fprintf(logfile, "%s: ar %d ir %d TCR %08x TSR %08x %08lx\n", __func__,

                (env->spr[SPR_40x_TCR] >> 22) & 0x1,

                (env->spr[SPR_40x_TCR] >> 26) & 0x1,

                env->spr[SPR_40x_TCR], env->spr[SPR_40x_TSR],

                ppcemb_timer->pit_reload);

    }

}

/* Watchdog timer */

static void cpu_4xx_wdt_cb (void *opaque)

{

    CPUState *env;

    ppc_tb_t *tb_env;

    ppcemb_timer_t *ppcemb_timer;

    uint64_t now, next;

    env = opaque;

    tb_env = env->tb_env;

    ppcemb_timer = tb_env->opaque;

    now = qemu_get_clock(vm_clock);

    switch ((env->spr[SPR_40x_TCR] >> 30) & 0x3) {

    case 0:

        next = 1 << 17;

        break;

    case 1:

        next = 1 << 21;

        break;

    case 2:

        next = 1 << 25;

        break;

    case 3:

        next = 1 << 29;

        break;

    default:

        /* Cannot occur, but makes gcc happy */

        return;

    }

    next = now + muldiv64(next, ticks_per_sec, tb_env->tb_freq);

    if (next == now)

        next++;

    if (loglevel) {

        fprintf(logfile, "%s: TCR %08x TSR %08x\n", __func__,

                env->spr[SPR_40x_TCR], env->spr[SPR_40x_TSR]);

    }

    switch ((env->spr[SPR_40x_TSR] >> 30) & 0x3) {

    case 0x0:

    case 0x1:

        qemu_mod_timer(ppcemb_timer->wdt_timer, next);

        ppcemb_timer->wdt_next = next;

        env->spr[SPR_40x_TSR] |= 1 << 31;

        break;

    case 0x2:

        qemu_mod_timer(ppcemb_timer->wdt_timer, next);

        ppcemb_timer->wdt_next = next;

        env->spr[SPR_40x_TSR] |= 1 << 30;

        if ((env->spr[SPR_40x_TCR] >> 27) & 0x1)

            ppc_set_irq(env, PPC_INTERRUPT_WDT, 1);

        break;

    case 0x3:

        env->spr[SPR_40x_TSR] &= ~0x30000000;

        env->spr[SPR_40x_TSR] |= env->spr[SPR_40x_TCR] & 0x30000000;

        switch ((env->spr[SPR_40x_TCR] >> 28) & 0x3) {

        case 0x0:

            /* No reset */

            break;

        case 0x1: /* Core reset */

        case 0x2: /* Chip reset */

        case 0x3: /* System reset */

            qemu_system_reset_request();

            return;

        }

    }

}

void store_40x_pit (CPUState *env, target_ulong val)

{

    ppc_tb_t *tb_env;

    ppcemb_timer_t *ppcemb_timer;

    uint64_t now, next;

    tb_env = env->tb_env;

    ppcemb_timer = tb_env->opaque;

    if (loglevel)

        fprintf(logfile, "%s %p %p\n", __func__, tb_env, ppcemb_timer);

    ppcemb_timer->pit_reload = val;

    if (val == 0) {

        /* Stop PIT */

        if (loglevel)

            fprintf(logfile, "%s: stop PIT\n", __func__);

        qemu_del_timer(tb_env->decr_timer);

    } else {

        if (loglevel)

            fprintf(logfile, "%s: start PIT 0x%08x\n", __func__, val);

        now = qemu_get_clock(vm_clock);

        next = now + muldiv64(val, ticks_per_sec, tb_env->tb_freq);

         if (next == now)

            next++;

        qemu_mod_timer(tb_env->decr_timer, next);

        tb_env->decr_next = next;

    }

}

target_ulong load_40x_pit (CPUState *env)

{

    return cpu_ppc_load_decr(env);

}

void store_booke_tsr (CPUState *env, target_ulong val)

{

    env->spr[SPR_40x_TSR] = val & 0xFC000000;

}

void store_booke_tcr (CPUState *env, target_ulong val)

{

    /* We don't update timers now. Maybe we should... */

    env->spr[SPR_40x_TCR] = val & 0xFF800000;

}

void ppc_emb_timers_init (CPUState *env)

{

    ppc_tb_t *tb_env;

    ppcemb_timer_t *ppcemb_timer;

    tb_env = env->tb_env;

    ppcemb_timer = qemu_mallocz(sizeof(ppcemb_timer_t));

    tb_env->opaque = ppcemb_timer;

    if (loglevel)

        fprintf(logfile, "%s %p %p\n", __func__, tb_env, ppcemb_timer);

    if (ppcemb_timer != NULL) {

        /* We use decr timer for PIT */

        tb_env->decr_timer = qemu_new_timer(vm_clock, &cpu_4xx_pit_cb, env);

        ppcemb_timer->fit_timer =

            qemu_new_timer(vm_clock, &cpu_4xx_fit_cb, env);

        ppcemb_timer->wdt_timer =

            qemu_new_timer(vm_clock, &cpu_4xx_wdt_cb, env);

    }

}

#if 0

/*****************************************************************************/

/* Handle system reset (for now, just stop emulation) */

void cpu_ppc_reset (CPUState *env)

{

    printf("Reset asked... Stop emulation\n");

    abort();

}

#endif

/*****************************************************************************/

/* Debug port */

void PPC_debug_write (void *opaque, uint32_t addr, uint32_t val)

{

    addr &= 0xF;

    switch (addr) {

    case 0:

        printf("%c", val);

        break;

    case 1:

        printf("\n");

        fflush(stdout);

        break;

    case 2:

        printf("Set loglevel to %04x\n", val);

        cpu_set_log(val | 0x100);

        break;

    }

}

/*****************************************************************************/

/* NVRAM helpers */

void NVRAM_set_byte (m48t59_t *nvram, uint32_t addr, uint8_t value)

{

    m48t59_write(nvram, addr, value);

}

uint8_t NVRAM_get_byte (m48t59_t *nvram, uint32_t addr)

{

    return m48t59_read(nvram, addr);

}

void NVRAM_set_word (m48t59_t *nvram, uint32_t addr, uint16_t value)

{

    m48t59_write(nvram, addr, value >> 8);

    m48t59_write(nvram, addr + 1, value & 0xFF);

}

uint16_t NVRAM_get_word (m48t59_t *nvram, uint32_t addr)

{

    uint16_t tmp;

    tmp = m48t59_read(nvram, addr) << 8;

    tmp |= m48t59_read(nvram, addr + 1);

    return tmp;

}

void NVRAM_set_lword (m48t59_t *nvram, uint32_t addr, uint32_t value)

{

    m48t59_write(nvram, addr, value >> 24);

    m48t59_write(nvram, addr + 1, (value >> 16) & 0xFF);

    m48t59_write(nvram, addr + 2, (value >> 8) & 0xFF);

    m48t59_write(nvram, addr + 3, value & 0xFF);

}

uint32_t NVRAM_get_lword (m48t59_t *nvram, uint32_t addr)

{

    uint32_t tmp;

    tmp = m48t59_read(nvram, addr) << 24;

    tmp |= m48t59_read(nvram, addr + 1) << 16;

    tmp |= m48t59_read(nvram, addr + 2) << 8;

    tmp |= m48t59_read(nvram, addr + 3);

    return tmp;

}

void NVRAM_set_string (m48t59_t *nvram, uint32_t addr,

                       const unsigned char *str, uint32_t max)

{

    int i;

    for (i = 0; i < max && str[i] != '\0'; i++) {

        m48t59_write(nvram, addr + i, str[i]);

    }

    m48t59_write(nvram, addr + max - 1, '\0');

}

int NVRAM_get_string (m48t59_t *nvram, uint8_t *dst, uint16_t addr, int max)

{

    int i;

    memset(dst, 0, max);

    for (i = 0; i < max; i++) {

        dst[i] = NVRAM_get_byte(nvram, addr + i);

        if (dst[i] == '\0')

            break;

    }

    return i;

}

static uint16_t NVRAM_crc_update (uint16_t prev, uint16_t value)

{

    uint16_t tmp;

    uint16_t pd, pd1, pd2;

    tmp = prev >> 8;

    pd = prev ^ value;

    pd1 = pd & 0x000F;

    pd2 = ((pd >> 4) & 0x000F) ^ pd1;

    tmp ^= (pd1 << 3) | (pd1 << 8);

    tmp ^= pd2 | (pd2 << 7) | (pd2 << 12);

    return tmp;

}

uint16_t NVRAM_compute_crc (m48t59_t *nvram, uint32_t start, uint32_t count)

{

    uint32_t i;

    uint16_t crc = 0xFFFF;

    int odd;

    odd = count & 1;

    count &= ~1;

    for (i = 0; i != count; i++) {

        crc = NVRAM_crc_update(crc, NVRAM_get_word(nvram, start + i));

    }

    if (odd) {

        crc = NVRAM_crc_update(crc, NVRAM_get_byte(nvram, start + i) << 8);

    }

    return crc;

}

#define CMDLINE_ADDR 0x017ff000

int PPC_NVRAM_set_params (m48t59_t *nvram, uint16_t NVRAM_size,

                          const unsigned char *arch,

                          uint32_t RAM_size, int boot_device,

                          uint32_t kernel_image, uint32_t kernel_size,

                          const char *cmdline,

                          uint32_t initrd_image, uint32_t initrd_size,

                          uint32_t NVRAM_image,

                          int width, int height, int depth)

{

    uint16_t crc;

    /* Set parameters for Open Hack'Ware BIOS */

    NVRAM_set_string(nvram, 0x00, "QEMU_BIOS", 16);

    NVRAM_set_lword(nvram,  0x10, 0x00000002); /* structure v2 */

    NVRAM_set_word(nvram,   0x14, NVRAM_size);

    NVRAM_set_string(nvram, 0x20, arch, 16);

    NVRAM_set_lword(nvram,  0x30, RAM_size);

    NVRAM_set_byte(nvram,   0x34, boot_device);

    NVRAM_set_lword(nvram,  0x38, kernel_image);

    NVRAM_set_lword(nvram,  0x3C, kernel_size);

    if (cmdline) {

        /* XXX: put the cmdline in NVRAM too ? */

        strcpy(phys_ram_base + CMDLINE_ADDR, cmdline);

        NVRAM_set_lword(nvram,  0x40, CMDLINE_ADDR);

        NVRAM_set_lword(nvram,  0x44, strlen(cmdline));

    } else {

        NVRAM_set_lword(nvram,  0x40, 0);

        NVRAM_set_lword(nvram,  0x44, 0);

    }

    NVRAM_set_lword(nvram,  0x48, initrd_image);

    NVRAM_set_lword(nvram,  0x4C, initrd_size);

    NVRAM_set_lword(nvram,  0x50, NVRAM_image);

    NVRAM_set_word(nvram,   0x54, width);

    NVRAM_set_word(nvram,   0x56, height);

    NVRAM_set_word(nvram,   0x58, depth);

    crc = NVRAM_compute_crc(nvram, 0x00, 0xF8);

    NVRAM_set_word(nvram,  0xFC, crc);

    return 0;

}