arch/s390/kernel/ipl_vmparm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <asm/ebcdic.h>
   3 #include <asm/ipl.h>
   4
   5 /* VM IPL PARM routines */
   6 size_t ipl_block_get_ascii_vmparm(char *dest, size_t size,
   7                                   const struct ipl_parameter_block *ipb)
   8 {
   9         int i;
  10         size_t len;
  11         char has_lowercase = 0;
  12
  13         len = 0;
  14         if ((ipb->ccw.vm_flags & IPL_PB0_CCW_VM_FLAG_VP) &&
  15             (ipb->ccw.vm_parm_len > 0)) {
  16
  17                 len = min_t(size_t, size - 1, ipb->ccw.vm_parm_len);
  18                 memcpy(dest, ipb->ccw.vm_parm, len);
  19                 /* If at least one character is lowercase, we assume mixed
  20                  * case; otherwise we convert everything to lowercase.
  21                  */
  22                 for (i = 0; i < len; i++)
  23                         if ((dest[i] > 0x80 && dest[i] < 0x8a) || /* a-i */
  24                             (dest[i] > 0x90 && dest[i] < 0x9a) || /* j-r */
  25                             (dest[i] > 0xa1 && dest[i] < 0xaa)) { /* s-z */
  26                                 has_lowercase = 1;
  27                                 break;
  28                         }
  29                 if (!has_lowercase)
  30                         EBC_TOLOWER(dest, len);
  31                 EBCASC(dest, len);
  32         }
  33         dest[len] = 0;
  34
  35         return len;
  36 }