Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc

[linux-2.6-omap-h63xx.git] / include / asm-powerpc / processor.h

diff --git a/include/asm-powerpc/processor.h b/include/asm-powerpc/processor.h
index 1f4765d6546fe0313b6bbc150ff38b509d6811ba..cf83f2d7e2a5dea90b550861b3b0502c54853551 100644 (file)
--- a/include/asm-powerpc/processor.h
+++ b/include/asm-powerpc/processor.h
@@ -113,12 +113,33 @@ extern struct task_struct *last_task_used_spe;
                TASK_UNMAPPED_BASE_USER32 : TASK_UNMAPPED_BASE_USER64 )
 #endif
 
+#ifdef __KERNEL__
+#ifdef __powerpc64__
+
+#define STACK_TOP_USER64 TASK_SIZE_USER64
+#define STACK_TOP_USER32 TASK_SIZE_USER32
+
+#define STACK_TOP (test_thread_flag(TIF_32BIT) ? \
+                  STACK_TOP_USER32 : STACK_TOP_USER64)
+
+#define STACK_TOP_MAX STACK_TOP_USER64
+
+#else /* __powerpc64__ */
+
+#define STACK_TOP TASK_SIZE
+#define STACK_TOP_MAX  STACK_TOP
+
+#endif /* __powerpc64__ */
+#endif /* __KERNEL__ */
+
 typedef struct {
        unsigned long seg;
 } mm_segment_t;
 
 struct thread_struct {
        unsigned long   ksp;            /* Kernel stack pointer */
+       unsigned long   ksp_limit;      /* if ksp <= ksp_limit stack overflow */
+
 #ifdef CONFIG_PPC64
        unsigned long   ksp_vsid;
 #endif
@@ -163,11 +184,14 @@ struct thread_struct {
 #define ARCH_MIN_TASKALIGN 16
 
 #define INIT_SP                (sizeof(init_stack) + (unsigned long) &init_stack)
+#define INIT_SP_LIMIT \
+       (_ALIGN_UP(sizeof(init_thread_info), 16) + (unsigned long) &init_stack)
 
 
 #ifdef CONFIG_PPC32
 #define INIT_THREAD { \
        .ksp = INIT_SP, \
+       .ksp_limit = INIT_SP_LIMIT, \
        .fs = KERNEL_DS, \
        .pgdir = swapper_pg_dir, \
        .fpexc_mode = MSR_FE0 | MSR_FE1, \
@@ -175,6 +199,7 @@ struct thread_struct {
 #else
 #define INIT_THREAD  { \
        .ksp = INIT_SP, \
+       .ksp_limit = INIT_SP_LIMIT, \
        .regs = (struct pt_regs *)INIT_SP - 1, /* XXX bogus, I think */ \
        .fs = KERNEL_DS, \
        .fpr = {0}, \