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-rw-r--r--arch/s390/kernel/ipl_vmparm.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/s390/kernel/ipl_vmparm.c b/arch/s390/kernel/ipl_vmparm.c
new file mode 100644
index 0000000000..b5245fadcf
--- /dev/null
+++ b/arch/s390/kernel/ipl_vmparm.c
@@ -0,0 +1,38 @@
+// 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;
+}