[RFC][PATCH 8/9] Support for old IBM PReP boxes

@@ -833,6 +833,27 @@
 	{0x000, 0x00, 0x00, "",					NULL,			NULL, NULL, NULL, 0x00}
 };

+u_int __init
+ibm_prep_boot_cpu(void)
+{
+	/* Scan the residual data for the CPU that the firmware used to
+	 * execute the loader - this is our boot CPU.  This is needed
+	 * because the 7043-240 (at least) will not always use CPU 0
+	 * as the boot CPU */
+	if (have_residual_data()) {
+		int i;
+
+		for (i = 0; i < res->MaxNumCpus; ++i)
+			if (res->Cpus[i].CpuState == CPU_GOOD) {
+				printk(KERN_INFO "PReP boot CPU: %d\n",
+							res->Cpus[i].CpuNumber);
+				return res->Cpus[i].CpuNumber;
+			}
+	}
+
+	return 0;
+}
+
 void __init
 ibm_prep_init(void)
 {

@@ -881,6 +902,7 @@
 			return;
 #undef p
 		OpenPIC_Addr = ioremap(addr, len);
+		OpenPIC_BootCPU = ibm_prep_boot_cpu();
 		ppc_md.get_irq = openpic_get_irq;

 		OpenPIC_InitSenses = prep_openpic_initsenses;

@@ -33,6 +33,7 @@
 #endif

 void* OpenPIC_Addr;
+u_int OpenPIC_BootCPU;
 static volatile struct OpenPIC *OpenPIC = NULL;

 /*

@@ -128,7 +129,7 @@
 #define DECL_THIS_CPU		int cpu = smp_hw_index[smp_processor_id()]
 #define CHECK_THIS_CPU		check_arg_cpu(cpu)
 #else
-#define THIS_CPU		Processor[0]
+#define THIS_CPU		Processor[OpenPIC_BootCPU]
 #define DECL_THIS_CPU
 #define CHECK_THIS_CPU
 #endif /* CONFIG_SMP */

@@ -407,8 +408,8 @@
 		/* Enabled, Priority 8 */
 		openpic_initirq(i, 8, i+offset, (sense & IRQ_POLARITY_MASK),
 				(sense & IRQ_SENSE_MASK));
-		/* Processor 0 */
-		openpic_mapirq(i, 1<<0, 0);
+		/* Boot Processor */
+		openpic_mapirq(i, 1<<OpenPIC_BootCPU, 0);
 	}

 	/* Init descriptors */

@@ -36,6 +36,7 @@
 extern u_int OpenPIC_NumInitSenses;
 extern u_char *OpenPIC_InitSenses;
 extern void* OpenPIC_Addr;
+extern u_int OpenPIC_BootCPU;

 /* Exported functions */
 extern void openpic_set_sources(int first_irq, int num_irqs, void *isr);