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// 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;
}
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