Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / sh / kernel / process.c

diff --git a/kernel/arch/sh/kernel/process.c b/kernel/arch/sh/kernel/process.c
new file mode 100644 (file)
index 0000000..53bc6c4
--- /dev/null
+++ b/kernel/arch/sh/kernel/process.c
@@ -0,0 +1,76 @@
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/export.h>
+#include <linux/stackprotector.h>
+#include <asm/fpu.h>
+
+struct kmem_cache *task_xstate_cachep = NULL;
+unsigned int xstate_size;
+
+#ifdef CONFIG_CC_STACKPROTECTOR
+unsigned long __stack_chk_guard __read_mostly;
+EXPORT_SYMBOL(__stack_chk_guard);
+#endif
+
+/*
+ * this gets called so that we can store lazy state into memory and copy the
+ * current task into the new thread.
+ */
+int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
+{
+#ifdef CONFIG_SUPERH32
+       unlazy_fpu(src, task_pt_regs(src));
+#endif
+       *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;
+       }
+}
+
+void arch_release_task_struct(struct task_struct *tsk)
+{
+       free_thread_xstate(tsk);
+}
+
+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;
+}