From 9e5e386e7c90669709dbc4c2f6cb5ab9e483c6d7 Mon Sep 17 00:00:00 2001
From: Tim Deegan <tim@xen.org>
Date: Tue, 13 Mar 2012 15:10:55 +0000
Subject: [PATCH] arm: start plumbing in SMP bringup in C

Still a noop, but no longer just a dummy symbol.

Signed-off-by: Tim Deegan <tim@xen.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
Committed-by: Ian Campbell <ian.campbell@citrix.com>
---
 xen/arch/arm/dummy.S   |  3 ---
 xen/arch/arm/setup.c   |  7 ++-----
 xen/arch/arm/smpboot.c | 43 +++++++++++++++++++++++++++++++++---------
 3 files changed, 36 insertions(+), 17 deletions(-)

diff --git a/xen/arch/arm/dummy.S b/xen/arch/arm/dummy.S
index 5f1fe2c462..8c6151cfc4 100644
--- a/xen/arch/arm/dummy.S
+++ b/xen/arch/arm/dummy.S
@@ -7,9 +7,6 @@ x:	.word 0xe7f000f0 /* Undefined instruction */
 x:	mov pc, lr
 	
 /* SMP support */
-DUMMY(__cpu_die);
-DUMMY(__cpu_disable);
-DUMMY(__cpu_up);
 DUMMY(per_cpu__cpu_core_mask);
 DUMMY(per_cpu__cpu_sibling_mask);
 DUMMY(node_online_map);
diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
index 865f6fabae..8d919d182b 100644
--- a/xen/arch/arm/setup.c
+++ b/xen/arch/arm/setup.c
@@ -38,9 +38,6 @@
 #include <asm/setup.h>
 #include "gic.h"
 
-/* maxcpus: maximum number of CPUs to activate. */
-static unsigned int __initdata max_cpus = NR_CPUS;
-
 /* Xen stack for bringing up the first CPU. */
 unsigned char __initdata init_stack[STACK_SIZE] __attribute__((__aligned__(STACK_SIZE)));
 
@@ -204,7 +201,7 @@ void __init start_xen(unsigned long boot_phys_offset,
     __set_current((struct vcpu *)0xfffff000); /* debug sanity */
     idle_vcpu[0] = current;
 
-    smp_prepare_cpus(max_cpus);
+    smp_prepare_cpus(cpus);
 
     init_xen_time();
 
@@ -251,7 +248,7 @@ void __init start_xen(unsigned long boot_phys_offset,
 
     for_each_present_cpu ( i )
     {
-        if ( (num_online_cpus() < max_cpus) && !cpu_online(i) )
+        if ( (num_online_cpus() < cpus) && !cpu_online(i) )
         {
             int ret = cpu_up(i);
             if ( ret != 0 )
diff --git a/xen/arch/arm/smpboot.c b/xen/arch/arm/smpboot.c
index 82874733e1..b4f25eeb71 100644
--- a/xen/arch/arm/smpboot.c
+++ b/xen/arch/arm/smpboot.c
@@ -19,6 +19,7 @@
 #include <xen/cpumask.h>
 #include <xen/smp.h>
 #include <xen/init.h>
+#include <xen/errno.h>
 
 cpumask_t cpu_online_map;
 EXPORT_SYMBOL(cpu_online_map);
@@ -30,16 +31,40 @@ EXPORT_SYMBOL(cpu_possible_map);
 void __init
 smp_prepare_cpus (unsigned int max_cpus)
 {
-        set_processor_id(0); /* needed early, for smp_processor_id() */
-
-        cpumask_clear(&cpu_online_map);
-        cpumask_clear(&cpu_present_map);
-        cpumask_clear(&cpu_possible_map);
-        cpumask_set_cpu(0, &cpu_online_map);
-        cpumask_set_cpu(0, &cpu_present_map);
-        cpumask_set_cpu(0, &cpu_possible_map);
-        return;
+    int i;
+    set_processor_id(0); /* needed early, for smp_processor_id() */
+
+    cpumask_clear(&cpu_online_map);
+    cpumask_set_cpu(0, &cpu_online_map);
+
+    cpumask_clear(&cpu_possible_map);
+    for ( i = 0; i < max_cpus; i++ )
+        cpumask_set_cpu(i, &cpu_possible_map);
+    cpumask_copy(&cpu_present_map, &cpu_possible_map);
 }
+
+/* Bring up a non-boot CPU */
+int __cpu_up(unsigned int cpu)
+{
+    /* Not yet... */
+    return -ENODEV;
+}
+
+/* Shut down the current CPU */
+void __cpu_disable(void)
+{
+    /* TODO: take down timers, GIC, &c. */
+    BUG();
+}
+
+/* Wait for a remote CPU to die */
+void __cpu_die(unsigned int cpu)
+{
+    /* TODO: interlock with __cpu_disable */
+    BUG();
+}
+
+
 /*
  * Local variables:
  * mode: C
-- 
2.39.5