Archipelago » qemu

/*

 * ACPI implementation

 *

 * Copyright (c) 2006 Fabrice Bellard

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License version 2 as published by the Free Software Foundation.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see <http://www.gnu.org/licenses/>

 *

 * Contributions after 2012-01-13 are licensed under the terms of the

 * GNU GPL, version 2 or (at your option) any later version.

 */

#include "sysemu.h"

#include "hw.h"

#include "pc.h"

#include "acpi.h"

struct acpi_table_header {

    uint16_t _length;         /* our length, not actual part of the hdr */

                              /* XXX why we have 2 length fields here? */

    char sig[4];              /* ACPI signature (4 ASCII characters) */

    uint32_t length;          /* Length of table, in bytes, including header */

    uint8_t revision;         /* ACPI Specification minor version # */

    uint8_t checksum;         /* To make sum of entire table == 0 */

    char oem_id[6];           /* OEM identification */

    char oem_table_id[8];     /* OEM table identification */

    uint32_t oem_revision;    /* OEM revision number */

    char asl_compiler_id[4];  /* ASL compiler vendor ID */

    uint32_t asl_compiler_revision; /* ASL compiler revision number */

} QEMU_PACKED;

#define ACPI_TABLE_HDR_SIZE sizeof(struct acpi_table_header)

#define ACPI_TABLE_PFX_SIZE sizeof(uint16_t)  /* size of the extra prefix */

static const char dfl_hdr[ACPI_TABLE_HDR_SIZE] =

    "\0\0"                   /* fake _length (2) */

    "QEMU\0\0\0\0\1\0"       /* sig (4), len(4), revno (1), csum (1) */

    "QEMUQEQEMUQEMU\1\0\0\0" /* OEM id (6), table (8), revno (4) */

    "QEMU\1\0\0\0"           /* ASL compiler ID (4), version (4) */

    ;

char *acpi_tables;

size_t acpi_tables_len;

static int acpi_checksum(const uint8_t *data, int len)

{

    int sum, i;

    sum = 0;

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

        sum += data[i];

    }

    return (-sum) & 0xff;

}

/* like strncpy() but zero-fills the tail of destination */

static void strzcpy(char *dst, const char *src, size_t size)

{

    size_t len = strlen(src);

    if (len >= size) {

        len = size;

    } else {

      memset(dst + len, 0, size - len);

    }

    memcpy(dst, src, len);

}

/* XXX fixme: this function uses obsolete argument parsing interface */

int acpi_table_add(const char *t)

{

    char buf[1024], *p, *f;

    unsigned long val;

    size_t len, start, allen;

    bool has_header;

    int changed;

    int r;

    struct acpi_table_header hdr;

    r = 0;

    r |= get_param_value(buf, sizeof(buf), "data", t) ? 1 : 0;

    r |= get_param_value(buf, sizeof(buf), "file", t) ? 2 : 0;

    switch (r) {

    case 0:

        buf[0] = '\0';

        /* fallthrough for default behavior */

    case 1:

        has_header = false;

        break;

    case 2:

        has_header = true;

        break;

    default:

        fprintf(stderr, "acpitable: both data and file are specified\n");

        return -1;

    }

    if (!acpi_tables) {

        allen = sizeof(uint16_t);

        acpi_tables = g_malloc0(allen);

    } else {

        allen = acpi_tables_len;

    }

    start = allen;

    acpi_tables = g_realloc(acpi_tables, start + ACPI_TABLE_HDR_SIZE);

    allen += has_header ? ACPI_TABLE_PFX_SIZE : ACPI_TABLE_HDR_SIZE;

    /* now read in the data files, reallocating buffer as needed */

    for (f = strtok(buf, ":"); f; f = strtok(NULL, ":")) {

        int fd = open(f, O_RDONLY);

        if (fd < 0) {

            fprintf(stderr, "can't open file %s: %s\n", f, strerror(errno));

            return -1;

        }

        for (;;) {

            char data[8192];

            r = read(fd, data, sizeof(data));

            if (r == 0) {

                break;

            } else if (r > 0) {

                acpi_tables = g_realloc(acpi_tables, allen + r);

                memcpy(acpi_tables + allen, data, r);

                allen += r;

            } else if (errno != EINTR) {

                fprintf(stderr, "can't read file %s: %s\n",

                        f, strerror(errno));

                close(fd);

                return -1;

            }

        }

        close(fd);

    }

    /* now fill in the header fields */

    f = acpi_tables + start;   /* start of the table */

    changed = 0;

    /* copy the header to temp place to align the fields */

    memcpy(&hdr, has_header ? f : dfl_hdr, ACPI_TABLE_HDR_SIZE);

    /* length of the table minus our prefix */

    len = allen - start - ACPI_TABLE_PFX_SIZE;

    hdr._length = cpu_to_le16(len);

    if (get_param_value(buf, sizeof(buf), "sig", t)) {

        strzcpy(hdr.sig, buf, sizeof(hdr.sig));

        ++changed;

    }

    /* length of the table including header, in bytes */

    if (has_header) {

        /* check if actual length is correct */

        val = le32_to_cpu(hdr.length);

        if (val != len) {

            fprintf(stderr,

                "warning: acpitable has wrong length,"

                " header says %lu, actual size %zu bytes\n",

                val, len);

            ++changed;

        }

    }

    /* we may avoid putting length here if has_header is true */

    hdr.length = cpu_to_le32(len);

    if (get_param_value(buf, sizeof(buf), "rev", t)) {

        val = strtoul(buf, &p, 0);

        if (val > 255 || *p) {

            fprintf(stderr, "acpitable: \"rev=%s\" is invalid\n", buf);

            return -1;

        }

        hdr.revision = (uint8_t)val;

        ++changed;

    }

    if (get_param_value(buf, sizeof(buf), "oem_id", t)) {

        strzcpy(hdr.oem_id, buf, sizeof(hdr.oem_id));

        ++changed;

    }

    if (get_param_value(buf, sizeof(buf), "oem_table_id", t)) {

        strzcpy(hdr.oem_table_id, buf, sizeof(hdr.oem_table_id));

        ++changed;

    }

    if (get_param_value(buf, sizeof(buf), "oem_rev", t)) {

        val = strtol(buf, &p, 0);

        if (*p) {

            fprintf(stderr, "acpitable: \"oem_rev=%s\" is invalid\n", buf);

            return -1;

        }

        hdr.oem_revision = cpu_to_le32(val);

        ++changed;

    }

    if (get_param_value(buf, sizeof(buf), "asl_compiler_id", t)) {

        strzcpy(hdr.asl_compiler_id, buf, sizeof(hdr.asl_compiler_id));

        ++changed;

    }

    if (get_param_value(buf, sizeof(buf), "asl_compiler_rev", t)) {

        val = strtol(buf, &p, 0);

        if (*p) {

            fprintf(stderr, "acpitable: \"%s=%s\" is invalid\n",

                    "asl_compiler_rev", buf);

            return -1;

        }

        hdr.asl_compiler_revision = cpu_to_le32(val);

        ++changed;

    }

    if (!has_header && !changed) {

        fprintf(stderr, "warning: acpitable: no table headers are specified\n");

    }

    /* now calculate checksum of the table, complete with the header */

    /* we may as well leave checksum intact if has_header is true */

    /* alternatively there may be a way to set cksum to a given value */

    hdr.checksum = 0;    /* for checksum calculation */

    /* put header back */

    memcpy(f, &hdr, sizeof(hdr));

    if (changed || !has_header || 1) {

        ((struct acpi_table_header *)f)->checksum =

            acpi_checksum((uint8_t *)f + ACPI_TABLE_PFX_SIZE, len);

    }

    /* increase number of tables */

    (*(uint16_t *)acpi_tables) =

        cpu_to_le32(le32_to_cpu(*(uint16_t *)acpi_tables) + 1);

    acpi_tables_len = allen;

    return 0;

}

static void acpi_notify_wakeup(Notifier *notifier, void *data)

{

    ACPIREGS *ar = container_of(notifier, ACPIREGS, wakeup);

    WakeupReason *reason = data;

    switch (*reason) {

    case QEMU_WAKEUP_REASON_RTC:

        ar->pm1.evt.sts |=

            (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_RT_CLOCK_STATUS);

        break;

    case QEMU_WAKEUP_REASON_PMTIMER:

        ar->pm1.evt.sts |=

            (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_TIMER_STATUS);

        break;

    case QEMU_WAKEUP_REASON_OTHER:

    default:

        /* ACPI_BITMASK_WAKE_STATUS should be set on resume.

           Pretend that resume was caused by power button */

        ar->pm1.evt.sts |=

            (ACPI_BITMASK_WAKE_STATUS | ACPI_BITMASK_POWER_BUTTON_STATUS);

        break;

    }

}

/* ACPI PM1a EVT */

uint16_t acpi_pm1_evt_get_sts(ACPIREGS *ar)

{

    int64_t d = acpi_pm_tmr_get_clock();

    if (d >= ar->tmr.overflow_time) {

        ar->pm1.evt.sts |= ACPI_BITMASK_TIMER_STATUS;

    }

    return ar->pm1.evt.sts;

}

void acpi_pm1_evt_write_sts(ACPIREGS *ar, uint16_t val)

{

    uint16_t pm1_sts = acpi_pm1_evt_get_sts(ar);

    if (pm1_sts & val & ACPI_BITMASK_TIMER_STATUS) {

        /* if TMRSTS is reset, then compute the new overflow time */

        acpi_pm_tmr_calc_overflow_time(ar);

    }

    ar->pm1.evt.sts &= ~val;

}

void acpi_pm1_evt_write_en(ACPIREGS *ar, uint16_t val)

{

    ar->pm1.evt.en = val;

    qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_RTC,

                              val & ACPI_BITMASK_RT_CLOCK_ENABLE);

    qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_PMTIMER,

                              val & ACPI_BITMASK_TIMER_ENABLE);

}

void acpi_pm1_evt_power_down(ACPIREGS *ar)

{

    if (ar->pm1.evt.en & ACPI_BITMASK_POWER_BUTTON_ENABLE) {

        ar->pm1.evt.sts |= ACPI_BITMASK_POWER_BUTTON_STATUS;

        ar->tmr.update_sci(ar);

    }

}

void acpi_pm1_evt_reset(ACPIREGS *ar)

{

    ar->pm1.evt.sts = 0;

    ar->pm1.evt.en = 0;

    qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_RTC, 0);

    qemu_system_wakeup_enable(QEMU_WAKEUP_REASON_PMTIMER, 0);

}

/* ACPI PM_TMR */

void acpi_pm_tmr_update(ACPIREGS *ar, bool enable)

{

    int64_t expire_time;

    /* schedule a timer interruption if needed */

    if (enable) {

        expire_time = muldiv64(ar->tmr.overflow_time, get_ticks_per_sec(),

                               PM_TIMER_FREQUENCY);

        qemu_mod_timer(ar->tmr.timer, expire_time);

    } else {

        qemu_del_timer(ar->tmr.timer);

    }

}

void acpi_pm_tmr_calc_overflow_time(ACPIREGS *ar)

{

    int64_t d = acpi_pm_tmr_get_clock();

    ar->tmr.overflow_time = (d + 0x800000LL) & ~0x7fffffLL;

}

uint32_t acpi_pm_tmr_get(ACPIREGS *ar)

{

    uint32_t d = acpi_pm_tmr_get_clock();

    return d & 0xffffff;

}

static void acpi_pm_tmr_timer(void *opaque)

{

    ACPIREGS *ar = opaque;

    qemu_system_wakeup_request(QEMU_WAKEUP_REASON_PMTIMER);

    ar->tmr.update_sci(ar);

}

void acpi_pm_tmr_init(ACPIREGS *ar, acpi_update_sci_fn update_sci)

{

    ar->tmr.update_sci = update_sci;

    ar->tmr.timer = qemu_new_timer_ns(vm_clock, acpi_pm_tmr_timer, ar);

}

void acpi_pm_tmr_reset(ACPIREGS *ar)

{

    ar->tmr.overflow_time = 0;

    qemu_del_timer(ar->tmr.timer);

}

/* ACPI PM1aCNT */

void acpi_pm1_cnt_init(ACPIREGS *ar)

{

    ar->wakeup.notify = acpi_notify_wakeup;

    qemu_register_wakeup_notifier(&ar->wakeup);

}

void acpi_pm1_cnt_write(ACPIREGS *ar, uint16_t val, char s4)

{

    ar->pm1.cnt.cnt = val & ~(ACPI_BITMASK_SLEEP_ENABLE);

    if (val & ACPI_BITMASK_SLEEP_ENABLE) {

        /* change suspend type */

        uint16_t sus_typ = (val >> 10) & 7;

        switch(sus_typ) {

        case 0: /* soft power off */

            qemu_system_shutdown_request();

            break;

        case 1:

            qemu_system_suspend_request();

            break;

        default:

            if (sus_typ == s4) { /* S4 request */

                qemu_system_shutdown_request();

            }

            break;

        }

    }

}

void acpi_pm1_cnt_update(ACPIREGS *ar,

                         bool sci_enable, bool sci_disable)

{

    /* ACPI specs 3.0, 4.7.2.5 */

    if (sci_enable) {

        ar->pm1.cnt.cnt |= ACPI_BITMASK_SCI_ENABLE;

    } else if (sci_disable) {

        ar->pm1.cnt.cnt &= ~ACPI_BITMASK_SCI_ENABLE;

    }

}

void acpi_pm1_cnt_reset(ACPIREGS *ar)

{

    ar->pm1.cnt.cnt = 0;

}

/* ACPI GPE */

void acpi_gpe_init(ACPIREGS *ar, uint8_t len)

{

    ar->gpe.len = len;

    ar->gpe.sts = g_malloc0(len / 2);

    ar->gpe.en = g_malloc0(len / 2);

}

void acpi_gpe_blk(ACPIREGS *ar, uint32_t blk)

{

    ar->gpe.blk = blk;

}

void acpi_gpe_reset(ACPIREGS *ar)

{

    memset(ar->gpe.sts, 0, ar->gpe.len / 2);

    memset(ar->gpe.en, 0, ar->gpe.len / 2);

}

static uint8_t *acpi_gpe_ioport_get_ptr(ACPIREGS *ar, uint32_t addr)

{

    uint8_t *cur = NULL;

    if (addr < ar->gpe.len / 2) {

        cur = ar->gpe.sts + addr;

    } else if (addr < ar->gpe.len) {

        cur = ar->gpe.en + addr - ar->gpe.len / 2;

    } else {

        abort();

    }

    return cur;

}

void acpi_gpe_ioport_writeb(ACPIREGS *ar, uint32_t addr, uint32_t val)

{

    uint8_t *cur;

    addr -= ar->gpe.blk;

    cur = acpi_gpe_ioport_get_ptr(ar, addr);

    if (addr < ar->gpe.len / 2) {

        /* GPE_STS */

        *cur = (*cur) & ~val;

    } else if (addr < ar->gpe.len) {

        /* GPE_EN */

        *cur = val;

    } else {

        abort();

    }

}

uint32_t acpi_gpe_ioport_readb(ACPIREGS *ar, uint32_t addr)

{

    uint8_t *cur;

    uint32_t val;

    addr -= ar->gpe.blk;

    cur = acpi_gpe_ioport_get_ptr(ar, addr);

    val = 0;

    if (cur != NULL) {

        val = *cur;

    }

    return val;

}