1 files changed, 50 insertions, 2 deletions

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index c2a7da3ac0f1..9fed5fa194d9 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -92,6 +92,14 @@ struct cpu_user_fns cpu_user;
 struct cpu_cache_fns cpu_cache;
 #endif
 
+struct stack {
+        u32 irq[3];
+        u32 abt[3];
+        u32 und[3];
+} ____cacheline_aligned;
+
+static struct stack stacks[NR_CPUS];
+
 char elf_platform[ELF_PLATFORM_SIZE];
 EXPORT_SYMBOL(elf_platform);
 
@@ -307,8 +315,6 @@ static void __init setup_processor(void)
                cpu_name, processor_id, (int)processor_id & 15,
                proc_arch[cpu_architecture()]);
 
-        dump_cpu_info(smp_processor_id());
-
         sprintf(system_utsname.machine, "%s%c", list->arch_name, ENDIANNESS);
         sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
         elf_hwcap = list->elf_hwcap;
@@ -316,6 +322,46 @@ static void __init setup_processor(void)
         cpu_proc_init();
 }
 
+/*
+ * cpu_init - initialise one CPU.
+ *
+ * cpu_init dumps the cache information, initialises SMP specific
+ * information, and sets up the per-CPU stacks.
+ */
+void cpu_init(void)
+{
+        unsigned int cpu = smp_processor_id();
+        struct stack *stk = &stacks[cpu];
+
+        if (cpu >= NR_CPUS) {
+                printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
+                BUG();
+        }
+
+        dump_cpu_info(cpu);
+
+        /*
+         * setup stacks for re-entrant exception handlers
+         */
+        __asm__ (
+        "msr    cpsr_c, %1\n\t"
+        "add    sp, %0, %2\n\t"
+        "msr    cpsr_c, %3\n\t"
+        "add    sp, %0, %4\n\t"
+        "msr    cpsr_c, %5\n\t"
+        "add    sp, %0, %6\n\t"
+        "msr    cpsr_c, %7"
+            :
+            : "r" (stk),
+              "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
+              "I" (offsetof(struct stack, irq[0])),
+              "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
+              "I" (offsetof(struct stack, abt[0])),
+              "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
+              "I" (offsetof(struct stack, und[0])),
+              "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE));
+}
+
 static struct machine_desc * __init setup_machine(unsigned int nr)
 {
         struct machine_desc *list;
@@ -715,6 +761,8 @@ void __init setup_arch(char **cmdline_p)
         paging_init(&meminfo, mdesc);
         request_standard_resources(&meminfo, mdesc);
 
+        cpu_init();
+
         /*
          * Set up various architecture-specific pointers
          */