1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/minmax.h>
3 #include <linux/string.h>
4 #include <asm/ebcdic.h>
5 #include <asm/ipl.h>
6
7 /* VM IPL PARM routines */
8 size_t ipl_block_get_ascii_vmparm(char *dest, size_t size,
9 const struct ipl_parameter_block *ipb)
10 {
11 int i;
12 size_t len;
13 char has_lowercase = 0;
14
15 len = 0;
16 if ((ipb->ccw.vm_flags & IPL_PB0_CCW_VM_FLAG_VP) &&
17 (ipb->ccw.vm_parm_len > 0)) {
18
19 len = min_t(size_t, size - 1, ipb->ccw.vm_parm_len);
20 memcpy(dest, ipb->ccw.vm_parm, len);
21 /* If at least one character is lowercase, we assume mixed
22 * case; otherwise we convert everything to lowercase.
23 */
24 for (i = 0; i < len; i++)
25 if ((dest[i] > 0x80 && dest[i] < 0x8a) || /* a-i */
26 (dest[i] > 0x90 && dest[i] < 0x9a) || /* j-r */
27 (dest[i] > 0xa1 && dest[i] < 0xaa)) { /* s-z */
28 has_lowercase = 1;
29 break;
30 }
31 if (!has_lowercase)
32 EBC_TOLOWER(dest, len);
33 EBCASC(dest, len);
34 }
35 dest[len] = 0;
36
37 return len;
38 }
39
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