Archipelago » qemu

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) */

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

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

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

#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) */

    ;

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

    }

/* 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 */

    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 = qemu_mallocz(allen);

        allen = acpi_tables_len;

    start = allen;

    acpi_tables = qemu_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 = qemu_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);

        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;

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

        ++changed;

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

        ++changed;

        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;

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

        ++changed;

        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);

    (*(uint16_t *)acpi_tables) =

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

    acpi_tables_len = allen;

    "-acpitable [sig=str][,rev=n][,oem_id=str][,oem_table_id=str][,oem_rev=n][,asl_compiler_id=str][,asl_compiler_rev=n][,{data|file}=file1[:file2]...]\n"

For file=, take whole ACPI table from the specified files, including all

ACPI headers (possible overridden by other options).

For data=, only data

portion of the table is used, all header information is specified in the

command line.