include/hw/nvram/openbios_firmware_abi.h

   1 #ifndef FIRMWARE_ABI_H
   2 #define FIRMWARE_ABI_H
   3
   4 /* OpenBIOS NVRAM partition */
   5 struct OpenBIOS_nvpart_v1 {
   6     uint8_t signature;
   7     uint8_t checksum;
   8     uint16_t len; // BE, length divided by 16
   9     char name[12];
  10 };
  11
  12 #define OPENBIOS_PART_SYSTEM 0x70
  13 #define OPENBIOS_PART_FREE 0x7f
  14
  15 static inline void
  16 OpenBIOS_finish_partition(struct OpenBIOS_nvpart_v1 *header, uint32_t size)
  17 {
  18     unsigned int i, sum;
  19     uint8_t *tmpptr;
  20
  21     // Length divided by 16
  22     header->len = cpu_to_be16(size >> 4);
  23
  24     // Checksum
  25     tmpptr = (uint8_t *)header;
  26     sum = *tmpptr;
  27     for (i = 0; i < 14; i++) {
  28         sum += tmpptr[2 + i];
  29         sum = (sum + ((sum & 0xff00) >> 8)) & 0xff;
  30     }
  31     header->checksum = sum & 0xff;
  32 }
  33
  34 static inline uint32_t
  35 OpenBIOS_set_var(uint8_t *nvram, uint32_t addr, const char *str)
  36 {
  37     uint32_t len;
  38
  39     len = strlen(str) + 1;
  40     memcpy(&nvram[addr], str, len);
  41
  42     return addr + len;
  43 }
  44
  45 /* Sun IDPROM structure at the end of NVRAM */
  46 /* from http://www.squirrel.com/squirrel/sun-nvram-hostid.faq.html */
  47 struct Sun_nvram {
  48     uint8_t type;       /* always 01 */
  49     uint8_t machine_id; /* first byte of host id (machine type) */
  50     uint8_t macaddr[6]; /* 6 byte ethernet address (first 3 bytes 08, 00, 20) */
  51     uint8_t date[4];    /* date of manufacture */
  52     uint8_t hostid[3];  /* remaining 3 bytes of host id (serial number) */
  53     uint8_t checksum;   /* bitwise xor of previous bytes */
  54 };
  55
  56 static inline void
  57 Sun_init_header(struct Sun_nvram *header, const uint8_t *macaddr, int machine_id)
  58 {
  59     uint8_t tmp, *tmpptr;
  60     unsigned int i;
  61
  62     header->type = 1;
  63     header->machine_id = machine_id & 0xff;
  64     memcpy(&header->macaddr, macaddr, 6);
  65     memcpy(&header->hostid , &macaddr[3], 3);
  66
  67     /* Calculate checksum */
  68     tmp = 0;
  69     tmpptr = (uint8_t *)header;
  70     for (i = 0; i < 15; i++)
  71         tmp ^= tmpptr[i];
  72
  73     header->checksum = tmp;
  74 }
  75 #endif /* FIRMWARE_ABI_H */