IPL_assert(bms->entry[i].type == BOOT_SCRIPT_EXEC,
"Unknown script entry type");
- jump_to_IPL_code(bms->entry[i].address.load_address); /* no return */
+ write_reset_psw(bms->entry[i].address.load_address); /* no return */
+ jump_to_IPL_code(0); /* no return */
}
static void ipl_eckd_cdl(void)
IPL_assert(entry->component_type == ZIPL_COMP_ENTRY_EXEC, "No EXEC entry");
/* should not return */
- jump_to_IPL_code(entry->compdat.load_psw & PSW_MASK_SHORT_ADDR);
+ write_reset_psw(entry->compdat.load_psw);
+ jump_to_IPL_code(0);
}
static void ipl_scsi(void)
#define KERN_IMAGE_START 0x010000UL
#define RESET_PSW_MASK (PSW_MASK_SHORTPSW | PSW_MASK_64)
+#define RESET_PSW ((uint64_t)&jump_to_IPL_addr | RESET_PSW_MASK)
static uint64_t *reset_psw = 0, save_psw, ipl_continue;
+void write_reset_psw(uint64_t psw)
+{
+ *reset_psw = psw;
+}
+
static void jump_to_IPL_addr(void)
{
__attribute__((noreturn)) void (*ipl)(void) = (void *)ipl_continue;
/* Restore reset PSW */
- *reset_psw = save_psw;
+ write_reset_psw(save_psw);
ipl();
/* should not return */
* content of non-BIOS memory after we loaded the guest, so we
* save the original content and restore it in jump_to_IPL_2.
*/
- save_psw = *reset_psw;
- *reset_psw = (uint64_t) &jump_to_IPL_addr;
- *reset_psw |= RESET_PSW_MASK;
- ipl_continue = address;
- debug_print_int("set IPL addr to", ipl_continue);
+ if (address) {
+ save_psw = *reset_psw;
+ write_reset_psw(RESET_PSW);
+ ipl_continue = address;
+ }
+ debug_print_int("set IPL addr to", address ?: *reset_psw & PSW_MASK_SHORT_ADDR);
/* Ensure the guest output starts fresh */
sclp_print("\n");
/* Trying to get PSW at zero address */
if (*((uint64_t *)0) & RESET_PSW_MASK) {
- jump_to_IPL_code((*((uint64_t *)0)) & PSW_MASK_SHORT_ADDR);
+ /*
+ * Surely nobody will try running directly from lowcore, so
+ * let's use 0 as an indication that we want to load the reset
+ * psw at 0x0 and not jump to the entry.
+ */
+ jump_to_IPL_code(0);
}
/* No other option left, so use the Linux kernel start address */