smbios.c

xen 3.2.2 源码

/*
 * smbios.c - Generate SMBIOS tables for Xen HVM domU's.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * Copyright (C) IBM Corporation, 2006
 *
 * Authors: Andrew D. Ball <[e-mail]>
 */

#include <stdint.h>
#include <xen/version.h>
#include "smbios_types.h"
#include "util.h"
#include "hypercall.h"
#include "e820.h"

static int
write_smbios_tables(void *start,
                    uint32_t vcpus, uint64_t memsize,
                    uint8_t uuid[16], char *xen_version,
                    uint32_t xen_major_version, uint32_t xen_minor_version);

static void
get_cpu_manufacturer(char *buf, int len);
static void
smbios_entry_point_init(void *start,
                        uint16_t max_structure_size,
                        uint16_t structure_table_length,
                        uint32_t structure_table_address,
                        uint16_t number_of_structures);
static void *
smbios_type_0_init(void *start, const char *xen_version,
                   uint32_t xen_major_version, uint32_t xen_minor_version);
static void *
smbios_type_1_init(void *start, const char *xen_version, 
                   uint8_t uuid[16]);
static void *
smbios_type_3_init(void *start);
static void *
smbios_type_4_init(void *start, unsigned int cpu_number,
                   char *cpu_manufacturer);
static void *
smbios_type_16_init(void *start, uint32_t memory_size_mb);
static void *
smbios_type_17_init(void *start, uint32_t memory_size_mb);
static void *
smbios_type_19_init(void *start, uint32_t memory_size_mb);
static void *
smbios_type_20_init(void *start, uint32_t memory_size_mb);
static void *
smbios_type_32_init(void *start);
static void *
smbios_type_127_init(void *start);

static void
get_cpu_manufacturer(char *buf, int len)
{
    char id[12];
    uint32_t eax = 0;

    cpuid(0, &eax, (uint32_t *)&id[0], (uint32_t *)&id[8],
          (uint32_t *)&id[4]);

    if (memcmp(id, "GenuineIntel", 12) == 0)
        strncpy(buf, "Intel", len);
    else if (memcmp(id, "AuthenticAMD", 12) == 0)
        strncpy(buf, "AMD", len);
    else
        strncpy(buf, "unknown", len);
}

static int
write_smbios_tables(void *start,
                    uint32_t vcpus, uint64_t memsize,
                    uint8_t uuid[16], char *xen_version,
                    uint32_t xen_major_version, uint32_t xen_minor_version)
{
    unsigned cpu_num, nr_structs = 0, max_struct_size = 0;
    char *p, *q;
    char cpu_manufacturer[15];

    get_cpu_manufacturer(cpu_manufacturer, 15);

    p = (char *)start + sizeof(struct smbios_entry_point);

#define do_struct(fn) do {                      \
    q = (fn);                                   \
    nr_structs++;                               \
    if ( (q - p) > max_struct_size )            \
        max_struct_size = q - p;                \
    p = q;                                      \
} while (0)

    do_struct(smbios_type_0_init(p, xen_version, xen_major_version,
                                 xen_minor_version));
    do_struct(smbios_type_1_init(p, xen_version, uuid));
    do_struct(smbios_type_3_init(p));
    for ( cpu_num = 1; cpu_num <= vcpus; cpu_num++ )
        do_struct(smbios_type_4_init(p, cpu_num, cpu_manufacturer));
    do_struct(smbios_type_16_init(p, memsize));
    do_struct(smbios_type_17_init(p, memsize));
    do_struct(smbios_type_19_init(p, memsize));
    do_struct(smbios_type_20_init(p, memsize));
    do_struct(smbios_type_32_init(p));
    do_struct(smbios_type_127_init(p));

#undef do_struct

    smbios_entry_point_init(
        start, max_struct_size,
        (p - (char *)start) - sizeof(struct smbios_entry_point),
        SMBIOS_PHYSICAL_ADDRESS + sizeof(struct smbios_entry_point),
        nr_structs);

    return ((char *)p - (char *)start);
}

/* Calculate how much pseudo-physical memory (in MB) is allocated to us. */
static uint64_t
get_memsize(void)
{
    struct e820entry *map = HVM_E820;
    uint8_t num_entries = *HVM_E820_NR;
    uint64_t memsize = 0;
    int i;

    /*
     * Walk through e820map, ignoring any entries that aren't marked
     * as usable or reserved.
     */
    for ( i = 0; i < num_entries; i++ )
    {
        if ( (map->type == E820_RAM) || (map->type == E820_RESERVED) )
            memsize += map->size;
        map++;
    }

    /*
     * Round up to the nearest MB.  The user specifies domU pseudo-physical 
     * memory in megabytes, so not doing this could easily lead to reporting 
     * one less MB than the user specified.
     */
    return (memsize + (1 << 20) - 1) >> 20;
}

int
hvm_write_smbios_tables(void)
{
    xen_domain_handle_t uuid;
    uint16_t xen_major_version, xen_minor_version;
    uint32_t xen_version;
    char xen_extra_version[XEN_EXTRAVERSION_LEN];
    /* guess conservatively on buffer length for Xen version string */
    char xen_version_str[80];
    /* temporary variables used to build up Xen version string */
    char *p = NULL; /* points to next point of insertion */
    unsigned len = 0; /* length of string already composed */
    char tmp[16]; /* holds result of itoa() */
    unsigned tmp_len; /* length of next string to add */

    hypercall_xen_version(XENVER_guest_handle, uuid);
    BUILD_BUG_ON(sizeof(xen_domain_handle_t) != 16);

    /* xen_version major and minor */
    xen_version = hypercall_xen_version(XENVER_version, NULL);
    xen_major_version = (uint16_t) (xen_version >> 16);
    xen_minor_version = (uint16_t) xen_version;

    hypercall_xen_version(XENVER_extraversion, xen_extra_version);

    /* build up human-readable Xen version string */
    p = xen_version_str;
    len = 0;

    itoa(tmp, xen_major_version);
    tmp_len = strlen(tmp);
    len += tmp_len;
    if ( len >= sizeof(xen_version_str) )
        goto error_out;
    strcpy(p, tmp);
    p += tmp_len;

    len++;
    if ( len >= sizeof(xen_version_str) )
        goto error_out;
    *p = '.';
    p++;

    itoa(tmp, xen_minor_version);
    tmp_len = strlen(tmp);
    len += tmp_len;
    if ( len >= sizeof(xen_version_str) )
        goto error_out;
    strcpy(p, tmp);
    p += tmp_len;

    tmp_len = strlen(xen_extra_version);
    len += tmp_len;
    if ( len >= sizeof(xen_version_str) )
        goto error_out;
    strcpy(p, xen_extra_version);
    p += tmp_len;

    xen_version_str[sizeof(xen_version_str)-1] = '\0';

    /* NB. 0xC0000 is a safe large memory area for scratch. */
    len = write_smbios_tables((void *)0xC0000,
                              get_vcpu_nr(), get_memsize(),
                              uuid, xen_version_str,
                              xen_major_version, xen_minor_version);
    if ( len > SMBIOS_MAXIMUM_SIZE )
        goto error_out;
    /* Okay, not too large: copy out of scratch to final location. */
    memcpy((void *)SMBIOS_PHYSICAL_ADDRESS, (void *)0xC0000, len);

    return len;

 error_out:
    printf("Could not write SMBIOS tables, error in hvmloader.c:"
           "hvm_write_smbios_tables()\n");
    return 0;
}


static void
smbios_entry_point_init(void *start,
                        uint16_t max_structure_size,
                        uint16_t structure_table_length,
                        uint32_t structure_table_address,
                        uint16_t number_of_structures)
{
    uint8_t sum;
    int i;
    struct smbios_entry_point *ep = (struct smbios_entry_point *)start;

    strncpy(ep->anchor_string, "_SM_", 4);
    ep->length = 0x1f;
    ep->smbios_major_version = 2;
    ep->smbios_minor_version = 4;
    ep->max_structure_size = max_structure_size;
    ep->entry_point_revision = 0;
    memset(ep->formatted_area, 0, 5);
    strncpy(ep->intermediate_anchor_string, "_DMI_", 5);
    
    ep->structure_table_length = structure_table_length;
    ep->structure_table_address = structure_table_address;
    ep->number_of_structures = number_of_structures;
    ep->smbios_bcd_revision = 0x24;

    ep->checksum = 0;
    ep->intermediate_checksum = 0;
    
    sum = 0;
    for ( i = 0; i < 0x10; i++ )
        sum += ((int8_t *)start)[i];
    ep->checksum = -sum;

    sum = 0;
    for ( i = 0x10; i < ep->length; i++ )
        sum += ((int8_t *)start)[i];
    ep->intermediate_checksum = -sum;
}

/* Type 0 -- BIOS Information */
static void *
smbios_type_0_init(void *start, const char *xen_version,
                   uint32_t xen_major_version, uint32_t xen_minor_version)
{
    struct smbios_type_0 *p = (struct smbios_type_0 *)start;