1 // SPDX-License-Identifier: GPL-2.0
2 #include <asm/ebcdic.h>
3 #include <asm/ipl.h>
4
5 /* VM IPL PARM routines */
ipl_block_get_ascii_vmparm(char * dest,size_t size,const struct ipl_parameter_block * ipb)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 }
37