4 files changed, 37 insertions, 15 deletions

diff --git a/arch/ia64/sn/kernel/io_init.c b/arch/ia64/sn/kernel/io_init.c
index 9e07f5463f21..783eb4323847 100644
--- a/arch/ia64/sn/kernel/io_init.c
+++ b/arch/ia64/sn/kernel/io_init.c
@@ -384,7 +384,7 @@ static int __init sn_pci_init(void)
         extern void register_sn_procfs(void);
 #endif
 
-        if (!ia64_platform_is("sn2") || IS_RUNNING_ON_SIMULATOR())
+        if (!ia64_platform_is("sn2") || IS_RUNNING_ON_FAKE_PROM())
                 return 0;
 
         /*
diff --git a/arch/ia64/sn/kernel/setup.c b/arch/ia64/sn/kernel/setup.c
index 3e5ba34ac2ef..22e10d282c7f 100644
--- a/arch/ia64/sn/kernel/setup.c
+++ b/arch/ia64/sn/kernel/setup.c
@@ -96,6 +96,7 @@ u8 sn_coherency_id;
 EXPORT_SYMBOL(sn_coherency_id);
 u8 sn_region_size;
 EXPORT_SYMBOL(sn_region_size);
+int sn_prom_type;       /* 0=hardware, 1=medusa/realprom, 2=medusa/fakeprom */
 
 short physical_node_map[MAX_PHYSNODE_ID];
 
@@ -354,7 +355,7 @@ void __init sn_setup(char **cmdline_p)
 
         ia64_mark_idle = &snidle;
 
-        /* 
+        /*
          * For the bootcpu, we do this here. All other cpus will make the
          * call as part of cpu_init in slave cpu initialization.
          */
@@ -401,7 +402,7 @@ static void __init sn_init_pdas(char **cmdline_p)
                 nodepdaindr[cnode] =
                     alloc_bootmem_node(NODE_DATA(cnode), sizeof(nodepda_t));
                 memset(nodepdaindr[cnode], 0, sizeof(nodepda_t));
-                memset(nodepdaindr[cnode]->phys_cpuid, -1, 
+                memset(nodepdaindr[cnode]->phys_cpuid, -1,
                     sizeof(nodepdaindr[cnode]->phys_cpuid));
         }
 
@@ -431,7 +432,7 @@ static void __init sn_init_pdas(char **cmdline_p)
         }
 
         /*
-         * Initialize the per node hubdev.  This includes IO Nodes and 
+         * Initialize the per node hubdev.  This includes IO Nodes and
          * headless/memless nodes.
          */
         for (cnode = 0; cnode < numionodes; cnode++) {
@@ -459,6 +460,14 @@ void __init sn_cpu_init(void)
         int i;
         static int wars_have_been_checked;
 
+        if (smp_processor_id() == 0 && IS_MEDUSA()) {
+                if (ia64_sn_is_fake_prom())
+                        sn_prom_type = 2;
+                else
+                        sn_prom_type = 1;
+                printk("Running on medusa with %s PROM\n", (sn_prom_type == 1) ? "real" : "fake");
+        }
+
         memset(pda, 0, sizeof(pda));
         if (ia64_sn_get_sn_info(0, &sn_hub_info->shub2, &sn_hub_info->nasid_bitmask, &sn_hub_info->nasid_shift,
                                 &sn_system_size, &sn_sharing_domain_size, &sn_partition_id,
@@ -524,7 +533,7 @@ void __init sn_cpu_init(void)
          */
         {
                 u64 pio1[] = {SH1_PIO_WRITE_STATUS_0, 0, SH1_PIO_WRITE_STATUS_1, 0};
-                u64 pio2[] = {SH2_PIO_WRITE_STATUS_0, SH2_PIO_WRITE_STATUS_1, 
+                u64 pio2[] = {SH2_PIO_WRITE_STATUS_0, SH2_PIO_WRITE_STATUS_1,
                         SH2_PIO_WRITE_STATUS_2, SH2_PIO_WRITE_STATUS_3};
                 u64 *pio;
                 pio = is_shub1() ? pio1 : pio2;
@@ -556,6 +565,10 @@ static void __init scan_for_ionodes(void)
         int nasid = 0;
         lboard_t *brd;
 
+        /* fakeprom does not support klgraph */
+        if (IS_RUNNING_ON_FAKE_PROM())
+                return;
+
         /* Setup ionodes with memory */
         for (nasid = 0; nasid < MAX_PHYSNODE_ID; nasid += 2) {
                 char *klgraph_header;
@@ -567,8 +580,6 @@ static void __init scan_for_ionodes(void)
                 cnodeid = -1;
                 klgraph_header = __va(ia64_sn_get_klconfig_addr(nasid));
                 if (!klgraph_header) {
-                        if (IS_RUNNING_ON_SIMULATOR())
-                                continue;
                         BUG();  /* All nodes must have klconfig tables! */
                 }
                 cnodeid = nasid_to_cnodeid(nasid);
@@ -634,8 +645,8 @@ int
 nasid_slice_to_cpuid(int nasid, int slice)
 {
         long cpu;
-        
-        for (cpu=0; cpu < NR_CPUS; cpu++) 
+
+        for (cpu=0; cpu < NR_CPUS; cpu++)
                 if (cpuid_to_nasid(cpu) == nasid &&
                                         cpuid_to_slice(cpu) == slice)
                         return cpu;
diff --git a/include/asm-ia64/sn/simulator.h b/include/asm-ia64/sn/simulator.h
index 78eb4f869c8b..cf770e246af5 100644
--- a/include/asm-ia64/sn/simulator.h
+++ b/include/asm-ia64/sn/simulator.h
@@ -10,16 +10,17 @@
 
 #include <linux/config.h>
 
-#ifdef CONFIG_IA64_SGI_SN_SIM
-
 #define SNMAGIC 0xaeeeeeee8badbeefL
-#define IS_RUNNING_ON_SIMULATOR() ({long sn; asm("mov %0=cpuid[%1]" : "=r"(sn) : "r"(2)); sn == SNMAGIC;})
-
-#define SIMULATOR_SLEEP()       asm("nop.i 0x8beef")
+#define IS_MEDUSA()                     ({long sn; asm("mov %0=cpuid[%1]" : "=r"(sn) : "r"(2)); sn == SNMAGIC;})
 
+#ifdef CONFIG_IA64_SGI_SN_SIM
+#define SIMULATOR_SLEEP()               asm("nop.i 0x8beef")
+#define IS_RUNNING_ON_SIMULATOR()       (sn_prom_type)
+#define IS_RUNNING_ON_FAKE_PROM()       (sn_prom_type == 2)
+extern int sn_prom_type;                /* 0=hardware, 1=medusa/realprom, 2=medusa/fakeprom */
 #else
-
 #define IS_RUNNING_ON_SIMULATOR()       (0)
+#define IS_RUNNING_ON_FAKE_PROM()       (0)
 #define SIMULATOR_SLEEP()
 
 #endif
diff --git a/include/asm-ia64/sn/sn_sal.h b/include/asm-ia64/sn/sn_sal.h
index eb0395ad0d6a..1455375d2ce4 100644
--- a/include/asm-ia64/sn/sn_sal.h
+++ b/include/asm-ia64/sn/sn_sal.h
@@ -132,6 +132,8 @@
 #define SALRET_INVALID_ARG      (-2)
 #define SALRET_ERROR            (-3)
 
+#define SN_SAL_FAKE_PROM                           0x02009999
+
 
 /**
  * sn_sal_rev_major - get the major SGI SAL revision number
@@ -1105,4 +1107,12 @@ ia64_sn_bte_recovery(nasid_t nasid)
         return (int) rv.status;
 }
 
+static inline int
+ia64_sn_is_fake_prom(void)
+{
+        struct ia64_sal_retval rv;
+        SAL_CALL_NOLOCK(rv, SN_SAL_FAKE_PROM, 0, 0, 0, 0, 0, 0, 0);
+        return (rv.status == 0);
+}
+
 #endif /* _ASM_IA64_SN_SN_SAL_H */