| 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 |