// SPDX-License-Identifier: GPL-2.0 #include <linux/minmax.h> #include <linux/string.h> #include <asm/ebcdic.h> #include <asm/ipl.h> /* VM IPL PARM routines */ size_t ipl_block_get_ascii_vmparm(char *dest, size_t size, const struct ipl_parameter_block *ipb) { int i; size_t len; char has_lowercase = 0; len = 0; if ((ipb->ccw.vm_flags & IPL_PB0_CCW_VM_FLAG_VP) && (ipb->ccw.vm_parm_len > 0)) { len = min_t(size_t, size - 1, ipb->ccw.vm_parm_len); memcpy(dest, ipb->ccw.vm_parm, len); /* If at least one character is lowercase, we assume mixed * case; otherwise we convert everything to lowercase. */ for (i = 0; i < len; i++) if ((dest[i] > 0x80 && dest[i] < 0x8a) || /* a-i */ (dest[i] > 0x90 && dest[i] < 0x9a) || /* j-r */ (dest[i] > 0xa1 && dest[i] < 0xaa)) { /* s-z */ has_lowercase = 1; break; } if (!has_lowercase) EBC_TOLOWER(dest, len); EBCASC(dest, len); } dest[len] = 0; return len; }