x86: merge APIC_init_uniprocessor

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 45 insertions, 3 deletions

diff --git a/arch/x86/kernel/apic_64.c b/arch/x86/kernel/apic_64.c
index dca6c246e731..16a30c22b07c 100644
--- a/arch/x86/kernel/apic_64.c
+++ b/arch/x86/kernel/apic_64.c
@@ -1351,6 +1351,7 @@ int apic_version[MAX_APICS];
 
 int __init APIC_init_uniprocessor(void)
 {
+#ifdef CONFIG_X86_64
         if (disable_apic) {
                 printk(KERN_INFO "Apic disabled\n");
                 return -1;
@@ -1360,37 +1361,78 @@ int __init APIC_init_uniprocessor(void)
                 printk(KERN_INFO "Apic disabled by BIOS\n");
                 return -1;
         }
+#else
+        if (!smp_found_config && !cpu_has_apic)
+                return -1;
+
+        /*
+         * Complain if the BIOS pretends there is one.
+         */
+        if (!cpu_has_apic &&
+            APIC_INTEGRATED(apic_version[boot_cpu_physical_apicid])) {
+                printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
+                       boot_cpu_physical_apicid);
+                clear_cpu_cap(&boot_cpu_data, X86_FEATURE_APIC);
+                return -1;
+        }
+#endif
+
 #ifdef HAVE_X2APIC
         enable_IR_x2apic();
 #endif
+#ifdef CONFIG_X86_64
         setup_apic_routing();
+#endif
 
         verify_local_APIC();
-
         connect_bsp_APIC();
 
-        physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
+#ifdef CONFIG_X86_64
         apic_write(APIC_ID, SET_APIC_ID(boot_cpu_physical_apicid));
-
+#else
+        /*
+         * Hack: In case of kdump, after a crash, kernel might be booting
+         * on a cpu with non-zero lapic id. But boot_cpu_physical_apicid
+         * might be zero if read from MP tables. Get it from LAPIC.
+         */
+# ifdef CONFIG_CRASH_DUMP
+        boot_cpu_physical_apicid = read_apic_id();
+# endif
+#endif
+        physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
         setup_local_APIC();
 
+#ifdef CONFIG_X86_64
         /*
          * Now enable IO-APICs, actually call clear_IO_APIC
          * We need clear_IO_APIC before enabling vector on BP
          */
         if (!skip_ioapic_setup && nr_ioapics)
                 enable_IO_APIC();
+#endif
 
+#ifdef CONFIG_X86_IO_APIC
         if (!smp_found_config || skip_ioapic_setup || !nr_ioapics)
+#endif
                 localise_nmi_watchdog();
         end_local_APIC_setup();
 
+#ifdef CONFIG_X86_IO_APIC
         if (smp_found_config && !skip_ioapic_setup && nr_ioapics)
                 setup_IO_APIC();
+# ifdef CONFIG_X86_64
         else
                 nr_ioapics = 0;
+# endif
+#endif
+
+#ifdef CONFIG_X86_64
         setup_boot_APIC_clock();
         check_nmi_watchdog();
+#else
+        setup_boot_clock();
+#endif
+
         return 0;
 }