1 files changed, 42 insertions, 11 deletions

diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index e72690ec9b87..a88bf2713d41 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -62,6 +62,7 @@
 #include <asm/udbg.h>
 #include <asm/kexec.h>
 #include <asm/mmu_context.h>
+#include <asm/code-patching.h>
 
 #include "setup.h"
 
@@ -72,6 +73,7 @@
 #endif
 
 int boot_cpuid = 0;
+int __initdata boot_cpu_count;
 u64 ppc64_pft_size;
 
 /* Pick defaults since we might want to patch instructions
@@ -233,6 +235,7 @@ void early_setup_secondary(void)
 void smp_release_cpus(void)
 {
         unsigned long *ptr;
+        int i;
 
         DBG(" -> smp_release_cpus()\n");
 
@@ -245,7 +248,16 @@ void smp_release_cpus(void)
         ptr  = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
                         - PHYSICAL_START);
         *ptr = __pa(generic_secondary_smp_init);
-        mb();
+
+        /* And wait a bit for them to catch up */
+        for (i = 0; i < 100000; i++) {
+                mb();
+                HMT_low();
+                if (boot_cpu_count == 0)
+                        break;
+                udelay(1);
+        }
+        DBG("boot_cpu_count = %d\n", boot_cpu_count);
 
         DBG(" <- smp_release_cpus()\n");
 }
@@ -423,22 +435,35 @@ void __init setup_system(void)
         DBG(" <- setup_system()\n");
 }
 
-static u64 slb0_limit(void)
+/* This returns the limit below which memory accesses to the linear
+ * mapping are guarnateed not to cause a TLB or SLB miss. This is
+ * used to allocate interrupt or emergency stacks for which our
+ * exception entry path doesn't deal with being interrupted.
+ */
+static u64 safe_stack_limit(void)
 {
-        if (cpu_has_feature(CPU_FTR_1T_SEGMENT)) {
+#ifdef CONFIG_PPC_BOOK3E
+        /* Freescale BookE bolts the entire linear mapping */
+        if (mmu_has_feature(MMU_FTR_TYPE_FSL_E))
+                return linear_map_top;
+        /* Other BookE, we assume the first GB is bolted */
+        return 1ul << 30;
+#else
+        /* BookS, the first segment is bolted */
+        if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
                 return 1UL << SID_SHIFT_1T;
-        }
         return 1UL << SID_SHIFT;
+#endif
 }
 
 static void __init irqstack_early_init(void)
 {
-        u64 limit = slb0_limit();
+        u64 limit = safe_stack_limit();
         unsigned int i;
 
         /*
-         * interrupt stacks must be under 256MB, we cannot afford to take
-         * SLB misses on them.
+         * Interrupt stacks must be in the first segment since we
+         * cannot afford to take SLB misses on them.
          */
         for_each_possible_cpu(i) {
                 softirq_ctx[i] = (struct thread_info *)
@@ -453,6 +478,9 @@ static void __init irqstack_early_init(void)
 #ifdef CONFIG_PPC_BOOK3E
 static void __init exc_lvl_early_init(void)
 {
+        extern unsigned int interrupt_base_book3e;
+        extern unsigned int exc_debug_debug_book3e;
+
         unsigned int i;
 
         for_each_possible_cpu(i) {
@@ -463,6 +491,10 @@ static void __init exc_lvl_early_init(void)
                 mcheckirq_ctx[i] = (struct thread_info *)
                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
         }
+
+        if (cpu_has_feature(CPU_FTR_DEBUG_LVL_EXC))
+                patch_branch(&interrupt_base_book3e + (0x040 / 4) + 1,
+                             (unsigned long)&exc_debug_debug_book3e, 0);
 }
 #else
 #define exc_lvl_early_init()
@@ -486,7 +518,7 @@ static void __init emergency_stack_init(void)
          * bringup, we need to get at them in real mode. This means they
          * must also be within the RMO region.
          */
-        limit = min(slb0_limit(), memblock.rmo_size);
+        limit = min(safe_stack_limit(), ppc64_rma_size);
 
         for_each_possible_cpu(i) {
                 unsigned long sp;
@@ -497,9 +529,8 @@ static void __init emergency_stack_init(void)
 }
 
 /*
- * Called into from start_kernel, after lock_kernel has been called.
- * Initializes bootmem, which is unsed to manage page allocation until
- * mem_init is called.
+ * Called into from start_kernel this initializes bootmem, which is used
+ * to manage page allocation until mem_init is called.
  */
 void __init setup_arch(char **cmdline_p)
 {