Linux-2.6.12-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, 245 insertions, 0 deletions

diff --git a/drivers/md/raid6x86.h b/drivers/md/raid6x86.h
new file mode 100644
index 000000000000..4cf20534fe44
--- /dev/null
+++ b/drivers/md/raid6x86.h
@@ -0,0 +1,245 @@
+/* ----------------------------------------------------------------------- *
+ *
+ *   Copyright 2002-2004 H. Peter Anvin - All Rights Reserved
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, Inc., 53 Temple Place Ste 330,
+ *   Bostom MA 02111-1307, USA; either version 2 of the License, or
+ *   (at your option) any later version; incorporated herein by reference.
+ *
+ * ----------------------------------------------------------------------- */
+
+/*
+ * raid6x86.h
+ *
+ * Definitions common to x86 and x86-64 RAID-6 code only
+ */
+
+#ifndef LINUX_RAID_RAID6X86_H
+#define LINUX_RAID_RAID6X86_H
+
+#if defined(__i386__) || defined(__x86_64__)
+
+#ifdef __x86_64__
+
+typedef struct {
+	unsigned int fsave[27];
+	unsigned long cr0;
+} raid6_mmx_save_t __attribute__((aligned(16)));
+
+/* N.B.: For SSE we only save %xmm0-%xmm7 even for x86-64, since
+   the code doesn't know about the additional x86-64 registers */
+typedef struct {
+	unsigned int sarea[8*4+2];
+	unsigned long cr0;
+} raid6_sse_save_t __attribute__((aligned(16)));
+
+/* This is for x86-64-specific code which uses all 16 XMM registers */
+typedef struct {
+	unsigned int sarea[16*4+2];
+	unsigned long cr0;
+} raid6_sse16_save_t __attribute__((aligned(16)));
+
+/* On x86-64 the stack *SHOULD* be 16-byte aligned, but currently this
+   is buggy in the kernel and it's only 8-byte aligned in places, so
+   we need to do this anyway.  Sigh. */
+#define SAREA(x) ((unsigned int *)((((unsigned long)&(x)->sarea)+15) & ~15))
+
+#else /* __i386__ */
+
+typedef struct {
+	unsigned int fsave[27];
+	unsigned long cr0;
+} raid6_mmx_save_t;
+
+/* On i386, the stack is only 8-byte aligned, but SSE requires 16-byte
+   alignment.  The +3 is so we have the slack space to manually align
+   a properly-sized area correctly.  */
+typedef struct {
+	unsigned int sarea[8*4+3];
+	unsigned long cr0;
+} raid6_sse_save_t;
+
+/* Find the 16-byte aligned save area */
+#define SAREA(x) ((unsigned int *)((((unsigned long)&(x)->sarea)+15) & ~15))
+
+#endif
+
+#ifdef __KERNEL__ /* Real code */
+
+/* Note: %cr0 is 32 bits on i386 and 64 bits on x86-64 */
+
+static inline unsigned long raid6_get_fpu(void)
+{
+	unsigned long cr0;
+
+	preempt_disable();
+	asm volatile("mov %%cr0,%0 ; clts" : "=r" (cr0));
+	return cr0;
+}
+
+static inline void raid6_put_fpu(unsigned long cr0)
+{
+	asm volatile("mov %0,%%cr0" : : "r" (cr0));
+	preempt_enable();
+}
+
+#else /* Dummy code for user space testing */
+
+static inline unsigned long raid6_get_fpu(void)
+{
+	return 0xf00ba6;
+}
+
+static inline void raid6_put_fpu(unsigned long cr0)
+{
+	(void)cr0;
+}
+
+#endif
+
+static inline void raid6_before_mmx(raid6_mmx_save_t *s)
+{
+	s->cr0 = raid6_get_fpu();
+	asm volatile("fsave %0 ; fwait" : "=m" (s->fsave[0]));
+}
+
+static inline void raid6_after_mmx(raid6_mmx_save_t *s)
+{
+	asm volatile("frstor %0" : : "m" (s->fsave[0]));
+	raid6_put_fpu(s->cr0);
+}
+
+static inline void raid6_before_sse(raid6_sse_save_t *s)
+{
+	unsigned int *rsa = SAREA(s);
+
+	s->cr0 = raid6_get_fpu();
+
+	asm volatile("movaps %%xmm0,%0" : "=m" (rsa[0]));
+	asm volatile("movaps %%xmm1,%0" : "=m" (rsa[4]));
+	asm volatile("movaps %%xmm2,%0" : "=m" (rsa[8]));
+	asm volatile("movaps %%xmm3,%0" : "=m" (rsa[12]));
+	asm volatile("movaps %%xmm4,%0" : "=m" (rsa[16]));
+	asm volatile("movaps %%xmm5,%0" : "=m" (rsa[20]));
+	asm volatile("movaps %%xmm6,%0" : "=m" (rsa[24]));
+	asm volatile("movaps %%xmm7,%0" : "=m" (rsa[28]));
+}
+
+static inline void raid6_after_sse(raid6_sse_save_t *s)
+{
+	unsigned int *rsa = SAREA(s);
+
+	asm volatile("movaps %0,%%xmm0" : : "m" (rsa[0]));
+	asm volatile("movaps %0,%%xmm1" : : "m" (rsa[4]));
+	asm volatile("movaps %0,%%xmm2" : : "m" (rsa[8]));
+	asm volatile("movaps %0,%%xmm3" : : "m" (rsa[12]));
+	asm volatile("movaps %0,%%xmm4" : : "m" (rsa[16]));
+	asm volatile("movaps %0,%%xmm5" : : "m" (rsa[20]));
+	asm volatile("movaps %0,%%xmm6" : : "m" (rsa[24]));
+	asm volatile("movaps %0,%%xmm7" : : "m" (rsa[28]));
+
+	raid6_put_fpu(s->cr0);
+}
+
+static inline void raid6_before_sse2(raid6_sse_save_t *s)
+{
+	unsigned int *rsa = SAREA(s);
+
+	s->cr0 = raid6_get_fpu();
+
+	asm volatile("movdqa %%xmm0,%0" : "=m" (rsa[0]));
+	asm volatile("movdqa %%xmm1,%0" : "=m" (rsa[4]));
+	asm volatile("movdqa %%xmm2,%0" : "=m" (rsa[8]));
+	asm volatile("movdqa %%xmm3,%0" : "=m" (rsa[12]));
+	asm volatile("movdqa %%xmm4,%0" : "=m" (rsa[16]));
+	asm volatile("movdqa %%xmm5,%0" : "=m" (rsa[20]));
+	asm volatile("movdqa %%xmm6,%0" : "=m" (rsa[24]));
+	asm volatile("movdqa %%xmm7,%0" : "=m" (rsa[28]));
+}
+
+static inline void raid6_after_sse2(raid6_sse_save_t *s)
+{
+	unsigned int *rsa = SAREA(s);
+
+	asm volatile("movdqa %0,%%xmm0" : : "m" (rsa[0]));
+	asm volatile("movdqa %0,%%xmm1" : : "m" (rsa[4]));
+	asm volatile("movdqa %0,%%xmm2" : : "m" (rsa[8]));
+	asm volatile("movdqa %0,%%xmm3" : : "m" (rsa[12]));
+	asm volatile("movdqa %0,%%xmm4" : : "m" (rsa[16]));
+	asm volatile("movdqa %0,%%xmm5" : : "m" (rsa[20]));
+	asm volatile("movdqa %0,%%xmm6" : : "m" (rsa[24]));
+	asm volatile("movdqa %0,%%xmm7" : : "m" (rsa[28]));
+
+	raid6_put_fpu(s->cr0);
+}
+
+#ifdef __x86_64__
+
+static inline void raid6_before_sse16(raid6_sse16_save_t *s)
+{
+	unsigned int *rsa = SAREA(s);
+
+	s->cr0 = raid6_get_fpu();
+
+	asm volatile("movdqa %%xmm0,%0" : "=m" (rsa[0]));
+	asm volatile("movdqa %%xmm1,%0" : "=m" (rsa[4]));
+	asm volatile("movdqa %%xmm2,%0" : "=m" (rsa[8]));
+	asm volatile("movdqa %%xmm3,%0" : "=m" (rsa[12]));
+	asm volatile("movdqa %%xmm4,%0" : "=m" (rsa[16]));
+	asm volatile("movdqa %%xmm5,%0" : "=m" (rsa[20]));
+	asm volatile("movdqa %%xmm6,%0" : "=m" (rsa[24]));
+	asm volatile("movdqa %%xmm7,%0" : "=m" (rsa[28]));
+	asm volatile("movdqa %%xmm8,%0" : "=m" (rsa[32]));
+	asm volatile("movdqa %%xmm9,%0" : "=m" (rsa[36]));
+	asm volatile("movdqa %%xmm10,%0" : "=m" (rsa[40]));
+	asm volatile("movdqa %%xmm11,%0" : "=m" (rsa[44]));
+	asm volatile("movdqa %%xmm12,%0" : "=m" (rsa[48]));
+	asm volatile("movdqa %%xmm13,%0" : "=m" (rsa[52]));
+	asm volatile("movdqa %%xmm14,%0" : "=m" (rsa[56]));
+	asm volatile("movdqa %%xmm15,%0" : "=m" (rsa[60]));
+}
+
+static inline void raid6_after_sse16(raid6_sse16_save_t *s)
+{
+	unsigned int *rsa = SAREA(s);
+
+	asm volatile("movdqa %0,%%xmm0" : : "m" (rsa[0]));
+	asm volatile("movdqa %0,%%xmm1" : : "m" (rsa[4]));
+	asm volatile("movdqa %0,%%xmm2" : : "m" (rsa[8]));
+	asm volatile("movdqa %0,%%xmm3" : : "m" (rsa[12]));
+	asm volatile("movdqa %0,%%xmm4" : : "m" (rsa[16]));
+	asm volatile("movdqa %0,%%xmm5" : : "m" (rsa[20]));
+	asm volatile("movdqa %0,%%xmm6" : : "m" (rsa[24]));
+	asm volatile("movdqa %0,%%xmm7" : : "m" (rsa[28]));
+	asm volatile("movdqa %0,%%xmm8" : : "m" (rsa[32]));
+	asm volatile("movdqa %0,%%xmm9" : : "m" (rsa[36]));
+	asm volatile("movdqa %0,%%xmm10" : : "m" (rsa[40]));
+	asm volatile("movdqa %0,%%xmm11" : : "m" (rsa[44]));
+	asm volatile("movdqa %0,%%xmm12" : : "m" (rsa[48]));
+	asm volatile("movdqa %0,%%xmm13" : : "m" (rsa[52]));
+	asm volatile("movdqa %0,%%xmm14" : : "m" (rsa[56]));
+	asm volatile("movdqa %0,%%xmm15" : : "m" (rsa[60]));
+
+	raid6_put_fpu(s->cr0);
+}
+
+#endif /* __x86_64__ */
+
+/* User space test hack */
+#ifndef __KERNEL__
+static inline int cpuid_features(void)
+{
+	u32 eax = 1;
+	u32 ebx, ecx, edx;
+
+	asm volatile("cpuid" :
+		     "+a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx));
+
+	return edx;
+}
+#endif /* ndef __KERNEL__ */
+
+#endif
+#endif