void sclp_early_detect(void);
void sclp_early_printk(const char *s);
void __sclp_early_printk(const char *s, unsigned int len);
+void sclp_emergency_printk(const char *s);
int sclp_early_get_memsize(unsigned long *mem);
int sclp_early_get_hsa_size(unsigned long *hsa_size);
}
/*
+ * Use sclp_emergency_printk() to print a string when the system is in a
+ * state where regular console drivers cannot be assumed to work anymore.
+ *
+ * Callers must make sure that no concurrent SCLP requests are outstanding
+ * and all other CPUs are stopped, or at least disabled for external
+ * interrupts.
+ */
+void sclp_emergency_printk(const char *str)
+{
+ int have_linemode, have_vt220;
+ unsigned int len;
+
+ len = strlen(str);
+ /*
+ * Don't care about return values; if requests fail, just ignore and
+ * continue to have a rather high chance that anything is printed.
+ */
+ sclp_early_setup(0, &have_linemode, &have_vt220);
+ sclp_early_print_lm(str, len);
+ sclp_early_print_vt220(str, len);
+ sclp_early_setup(1, &have_linemode, &have_vt220);
+}
+
+/*
* We can't pass sclp_info_sccb to sclp_early_cmd() here directly,
* because it might not fulfil the requiremets for a SCLP communication buffer:
* - lie below 2G in memory