diff options
| -rw-r--r-- | pc-bios/s390-ccw/netmain.c | 56 |
1 files changed, 55 insertions, 1 deletions
diff --git a/pc-bios/s390-ccw/netmain.c b/pc-bios/s390-ccw/netmain.c index c059546..0392131 100644 --- a/pc-bios/s390-ccw/netmain.c +++ b/pc-bios/s390-ccw/netmain.c @@ -44,6 +44,9 @@ extern char _start[]; #define KERNEL_MAX_SIZE ((long)_start) #define ARCH_COMMAND_LINE_SIZE 896 /* Taken from Linux kernel */ +/* STSI 3.2.2 offset of first vmdb + offset of uuid inside vmdb */ +#define STSI322_VMDB_UUID_OFFSET ((8 + 12) * 4) + char stack[PAGE_SIZE * 8] __attribute__((aligned(PAGE_SIZE))); IplParameterBlock iplb __attribute__((aligned(PAGE_SIZE))); static char cfgbuf[2048]; @@ -236,6 +239,56 @@ static void net_release(filename_ip_t *fn_ip) } /** + * Retrieve the Universally Unique Identifier of the VM. + * @return UUID string, or NULL in case of errors + */ +static const char *get_uuid(void) +{ + register int r0 asm("0"); + register int r1 asm("1"); + uint8_t *mem, *buf, uuid[16]; + int i, cc, chk = 0; + static char uuid_str[37]; + + mem = malloc(2 * PAGE_SIZE); + if (!mem) { + puts("Out of memory ... can not get UUID."); + return NULL; + } + buf = (uint8_t *)(((uint64_t)mem + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1)); + memset(buf, 0, PAGE_SIZE); + + /* Get SYSIB 3.2.2 */ + r0 = (3 << 28) | 2; + r1 = 2; + asm volatile(" stsi 0(%[addr])\n" + " ipm %[cc]\n" + " srl %[cc],28\n" + : [cc] "=d" (cc) + : "d" (r0), "d" (r1), [addr] "a" (buf) + : "cc", "memory"); + if (cc) { + return NULL; + } + + for (i = 0; i < 16; i++) { + uuid[i] = buf[STSI322_VMDB_UUID_OFFSET + i]; + chk |= uuid[i]; + } + free(mem); + if (!chk) { + return NULL; + } + + sprintf(uuid_str, "%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-" + "%02x%02x%02x%02x%02x%02x", uuid[0], uuid[1], uuid[2], uuid[3], + uuid[4], uuid[5], uuid[6], uuid[7], uuid[8], uuid[9], uuid[10], + uuid[11], uuid[12], uuid[13], uuid[14], uuid[15]); + + return uuid_str; +} + +/** * Load a kernel with initrd (i.e. with the information that we've got from * a pxelinux.cfg config file) */ @@ -285,7 +338,8 @@ static int net_try_pxelinux_cfg(filename_ip_t *fn_ip) struct pl_cfg_entry entries[MAX_PXELINUX_ENTRIES]; int num_ent, def_ent = 0; - num_ent = pxelinux_load_parse_cfg(fn_ip, mac, NULL, DEFAULT_TFTP_RETRIES, + num_ent = pxelinux_load_parse_cfg(fn_ip, mac, get_uuid(), + DEFAULT_TFTP_RETRIES, cfgbuf, sizeof(cfgbuf), entries, MAX_PXELINUX_ENTRIES, &def_ent); if (num_ent > 0) { |