1 files changed, 101 insertions, 0 deletions

diff --git a/arch/sh/kernel/process.c b/arch/sh/kernel/process.c
new file mode 100644
index 000000000000..17f89aa4e1b3
--- /dev/null
+++ b/arch/sh/kernel/process.c
@@ -0,0 +1,101 @@
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+
+struct kmem_cache *task_xstate_cachep = NULL;
+unsigned int xstate_size;
+
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
+{
+        *dst = *src;
+
+        if (src->thread.xstate) {
+                dst->thread.xstate = kmem_cache_alloc(task_xstate_cachep,
+                                                      GFP_KERNEL);
+                if (!dst->thread.xstate)
+                        return -ENOMEM;
+                memcpy(dst->thread.xstate, src->thread.xstate, xstate_size);
+        }
+
+        return 0;
+}
+
+void free_thread_xstate(struct task_struct *tsk)
+{
+        if (tsk->thread.xstate) {
+                kmem_cache_free(task_xstate_cachep, tsk->thread.xstate);
+                tsk->thread.xstate = NULL;
+        }
+}
+
+#if THREAD_SHIFT < PAGE_SHIFT
+static struct kmem_cache *thread_info_cache;
+
+struct thread_info *alloc_thread_info(struct task_struct *tsk)
+{
+        struct thread_info *ti;
+
+        ti = kmem_cache_alloc(thread_info_cache, GFP_KERNEL);
+        if (unlikely(ti == NULL))
+                return NULL;
+#ifdef CONFIG_DEBUG_STACK_USAGE
+        memset(ti, 0, THREAD_SIZE);
+#endif
+        return ti;
+}
+
+void free_thread_info(struct thread_info *ti)
+{
+        free_thread_xstate(ti->task);
+        kmem_cache_free(thread_info_cache, ti);
+}
+
+void thread_info_cache_init(void)
+{
+        thread_info_cache = kmem_cache_create("thread_info", THREAD_SIZE,
+                                              THREAD_SIZE, SLAB_PANIC, NULL);
+}
+#else
+struct thread_info *alloc_thread_info(struct task_struct *tsk)
+{
+#ifdef CONFIG_DEBUG_STACK_USAGE
+        gfp_t mask = GFP_KERNEL | __GFP_ZERO;
+#else
+        gfp_t mask = GFP_KERNEL;
+#endif
+        return (struct thread_info *)__get_free_pages(mask, THREAD_SIZE_ORDER);
+}
+
+void free_thread_info(struct thread_info *ti)
+{
+        free_thread_xstate(ti->task);
+        free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
+}
+#endif /* THREAD_SHIFT < PAGE_SHIFT */
+
+void arch_task_cache_init(void)
+{
+        if (!xstate_size)
+                return;
+
+        task_xstate_cachep = kmem_cache_create("task_xstate", xstate_size,
+                                               __alignof__(union thread_xstate),
+                                               SLAB_PANIC | SLAB_NOTRACK, NULL);
+}
+
+#ifdef CONFIG_SH_FPU_EMU
+# define HAVE_SOFTFP    1
+#else
+# define HAVE_SOFTFP    0
+#endif
+
+void init_thread_xstate(void)
+{
+        if (boot_cpu_data.flags & CPU_HAS_FPU)
+                xstate_size = sizeof(struct sh_fpu_hard_struct);
+        else if (HAVE_SOFTFP)
+                xstate_size = sizeof(struct sh_fpu_soft_struct);
+        else
+                xstate_size = 0;
+}