Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 150 insertions, 0 deletions

diff --git a/include/asm-x86_64/i387.h b/include/asm-x86_64/i387.h
new file mode 100644
index 000000000000..aa39cfd0e001
--- /dev/null
+++ b/include/asm-x86_64/i387.h
@@ -0,0 +1,150 @@
+/*
+ * include/asm-x86_64/i387.h
+ *
+ * Copyright (C) 1994 Linus Torvalds
+ *
+ * Pentium III FXSR, SSE support
+ * General FPU state handling cleanups
+ *      Gareth Hughes <gareth@valinux.com>, May 2000
+ * x86-64 work by Andi Kleen 2002
+ */
+
+#ifndef __ASM_X86_64_I387_H
+#define __ASM_X86_64_I387_H
+
+#include <linux/sched.h>
+#include <asm/processor.h>
+#include <asm/sigcontext.h>
+#include <asm/user.h>
+#include <asm/thread_info.h>
+#include <asm/uaccess.h>
+
+extern void fpu_init(void);
+extern unsigned int mxcsr_feature_mask;
+extern void mxcsr_feature_mask_init(void);
+extern void init_fpu(struct task_struct *child);
+extern int save_i387(struct _fpstate __user *buf);
+
+/*
+ * FPU lazy state save handling...
+ */
+
+#define unlazy_fpu(tsk) do { \
+        if ((tsk)->thread_info->status & TS_USEDFPU) \
+                save_init_fpu(tsk); \
+} while (0)
+
+/* Ignore delayed exceptions from user space */
+static inline void tolerant_fwait(void)
+{
+        asm volatile("1: fwait\n"
+                     "2:\n"
+                     "   .section __ex_table,\"a\"\n"
+                     "  .align 8\n"
+                     "  .quad 1b,2b\n"
+                     "  .previous\n");
+}
+
+#define clear_fpu(tsk) do { \
+        if ((tsk)->thread_info->status & TS_USEDFPU) {          \
+                tolerant_fwait();                               \
+                (tsk)->thread_info->status &= ~TS_USEDFPU;      \
+                stts();                                         \
+        }                                                       \
+} while (0)
+
+/*
+ * ptrace request handers...
+ */
+extern int get_fpregs(struct user_i387_struct __user *buf,
+                      struct task_struct *tsk);
+extern int set_fpregs(struct task_struct *tsk,
+                      struct user_i387_struct __user *buf);
+
+/*
+ * i387 state interaction
+ */
+#define get_fpu_mxcsr(t) ((t)->thread.i387.fxsave.mxcsr)
+#define get_fpu_cwd(t) ((t)->thread.i387.fxsave.cwd)
+#define get_fpu_fxsr_twd(t) ((t)->thread.i387.fxsave.twd)
+#define get_fpu_swd(t) ((t)->thread.i387.fxsave.swd)
+#define set_fpu_cwd(t,val) ((t)->thread.i387.fxsave.cwd = (val))
+#define set_fpu_swd(t,val) ((t)->thread.i387.fxsave.swd = (val))
+#define set_fpu_fxsr_twd(t,val) ((t)->thread.i387.fxsave.twd = (val))
+
+static inline int restore_fpu_checking(struct i387_fxsave_struct *fx) 
+{ 
+        int err;
+        asm volatile("1:  rex64 ; fxrstor (%[fx])\n\t"
+                     "2:\n"
+                     ".section .fixup,\"ax\"\n"
+                     "3:  movl $-1,%[err]\n"
+                     "    jmp  2b\n"
+                     ".previous\n"
+                     ".section __ex_table,\"a\"\n"
+                     "   .align 8\n"
+                     "   .quad  1b,3b\n"
+                     ".previous"
+                     : [err] "=r" (err)
+                     : [fx] "r" (fx), "0" (0)); 
+        if (unlikely(err))
+                init_fpu(current);
+        return err;
+} 
+
+static inline int save_i387_checking(struct i387_fxsave_struct __user *fx) 
+{ 
+        int err;
+        asm volatile("1:  rex64 ; fxsave (%[fx])\n\t"
+                     "2:\n"
+                     ".section .fixup,\"ax\"\n"
+                     "3:  movl $-1,%[err]\n"
+                     "    jmp  2b\n"
+                     ".previous\n"
+                     ".section __ex_table,\"a\"\n"
+                     "   .align 8\n"
+                     "   .quad  1b,3b\n"
+                     ".previous"
+                     : [err] "=r" (err)
+                     : [fx] "r" (fx), "0" (0)); 
+        if (unlikely(err))
+                __clear_user(fx, sizeof(struct i387_fxsave_struct));
+        return err;
+} 
+
+static inline void kernel_fpu_begin(void)
+{
+        struct thread_info *me = current_thread_info();
+        preempt_disable();
+        if (me->status & TS_USEDFPU) { 
+                asm volatile("rex64 ; fxsave %0 ; fnclex"
+                              : "=m" (me->task->thread.i387.fxsave));
+                me->status &= ~TS_USEDFPU;
+                return;
+        }
+        clts();
+}
+
+static inline void kernel_fpu_end(void)
+{
+        stts();
+        preempt_enable();
+}
+
+static inline void save_init_fpu( struct task_struct *tsk )
+{
+        asm volatile( "rex64 ; fxsave %0 ; fnclex"
+                      : "=m" (tsk->thread.i387.fxsave));
+        tsk->thread_info->status &= ~TS_USEDFPU;
+        stts();
+}
+
+/* 
+ * This restores directly out of user space. Exceptions are handled.
+ */
+static inline int restore_i387(struct _fpstate __user *buf)
+{
+        return restore_fpu_checking((__force struct i387_fxsave_struct *)buf);
+}
+
+#endif /* __ASM_X86_64_I387_H */