[PATCH v6 18/28] pc-bios/s390-ccw: Rework zipl_load_segment function

[Zhuoying Cai <zycai@linux.ibm.com>]

Make the address variable a parameter of zipl_load_segment and return
segment length.

Modify this function to allow the caller to specify a memory address
where segment data should be loaded into.

seg_len variable is necessary to store the calculated segment length and
is used during signature verification. Return the length on success, or
a negative return code on failure.

Signed-off-by: Zhuoying Cai <zycai@linux.ibm.com>
---
 pc-bios/s390-ccw/bootmap.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/pc-bios/s390-ccw/bootmap.c b/pc-bios/s390-ccw/bootmap.c
index ff0fa78cf0..4f54c643ff 100644
--- a/pc-bios/s390-ccw/bootmap.c
+++ b/pc-bios/s390-ccw/bootmap.c
@@ -613,19 +613,22 @@ static int ipl_eckd(void)
  * IPL a SCSI disk
  */
 
-static int zipl_load_segment(ComponentEntry *entry)
+/*
+ * Returns: length of the segment on sucess,
+ *          negative value on error.
+ */
+static int zipl_load_segment(ComponentEntry *entry, uint64_t address)
 {
     const int max_entries = (MAX_SECTOR_SIZE / sizeof(ScsiBlockPtr));
     ScsiBlockPtr *bprs = (void *)sec;
     const int bprs_size = sizeof(sec);
     block_number_t blockno;
-    uint64_t address;
     int i;
     char err_msg[] = "zIPL failed to read BPRS at 0xZZZZZZZZZZZZZZZZ";
     char *blk_no = &err_msg[30]; /* where to print blockno in (those ZZs) */
+    int seg_len = 0;
 
     blockno = entry->data.blockno;
-    address = entry->compdat.load_addr;
 
     debug_print_int("loading segment at block", blockno);
     debug_print_int("addr", address);
@@ -668,10 +671,12 @@ static int zipl_load_segment(ComponentEntry *entry)
                 puts("zIPL load segment failed");
                 return -EIO;
             }
+
+            seg_len += bprs->size * (bprs[i].blockct + 1);
         }
     } while (blockno);
 
-    return 0;
+    return seg_len;
 }
 
 static int zipl_run_normal(ComponentEntry **entry_ptr, uint8_t *tmp_sec)
@@ -687,7 +692,7 @@ static int zipl_run_normal(ComponentEntry **entry_ptr, uint8_t *tmp_sec)
             continue;
         }
 
-        if (zipl_load_segment(entry)) {
+        if (zipl_load_segment(entry, entry->compdat.load_addr) < 0) {
             return -1;
         }
 
-- 
2.50.1