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[src/trunk]: src/sys/arch Move all the hardware register layout for the x86 c...
details: https://anonhg.NetBSD.org/src/rev/47a6635c318a
branches: trunk
changeset: 326621:47a6635c318a
user: dsl <dsl%NetBSD.org@localhost>
date: Fri Feb 07 19:36:15 2014 +0000
description:
Move all the hardware register layout for the x86 cpus into a header
that can also be used by amd64.
Add in skeleton definitions for XSAVE and AVX.
Update some comments to match reality.
diffstat:
sys/arch/i386/include/npx.h | 180 +----------------------
sys/arch/x86/include/cpu_extended_state.h | 242 ++++++++++++++++++++++++++++++
2 files changed, 244 insertions(+), 178 deletions(-)
diffs (truncated from 437 to 300 lines):
diff -r 826d96c5ae72 -r 47a6635c318a sys/arch/i386/include/npx.h
--- a/sys/arch/i386/include/npx.h Fri Feb 07 19:32:50 2014 +0000
+++ b/sys/arch/i386/include/npx.h Fri Feb 07 19:36:15 2014 +0000
@@ -1,185 +1,9 @@
-/* $NetBSD: npx.h,v 1.33 2014/02/04 22:21:35 dsl Exp $ */
-
-/*-
- * Copyright (c) 1990 The Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * William Jolitz.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * @(#)npx.h 5.3 (Berkeley) 1/18/91
- */
-
-/*
- * 287/387 NPX Coprocessor Data Structures and Constants
- * W. Jolitz 1/90
- */
+/* $NetBSD: npx.h,v 1.34 2014/02/07 19:36:15 dsl Exp $ */
#ifndef _I386_NPX_H_
#define _I386_NPX_H_
-/*
- * Layout for code/data pointers relating to FP exceptions.
- * Marked 'packed' because they aren't always 64bit aligned.
- * Since the x86 cpu supports misaligned accesses it isn't
- * worth avoiding the 'packed' attribute.
- */
-union fp_addr {
- uint64_t fa_64; /* Linear address for 64bit systems */
- struct {
- uint32_t fa_off; /* linear address for 32 bit */
- uint16_t fa_seg; /* code/data (etc) segment */
- uint16_t fa_opcode; /* last opcode (sometimes) */
- } fa_32;
-} __packed;
-
-/* The x87 registers are 80 bits (in ST(n) order) */
-struct fpacc87 {
- uint64_t f87_mantissa; /* mantissa */
- uint16_t f87_exp_sign; /* exponent and sign */
-} __packed;
-
-/* The x87 registers padded out for fxsave */
-struct fpaccfx {
- struct fpacc87 r __aligned(16);
-};
-
-/*
- * floating point unit registers (fsave instruction).
- * Note that the 'tag word' contains 2 bits per register and is relative
- * to the stack top.
- * The fxsave version is 1 bit per register indexed by register number.
- */
-struct save87 {
- uint32_t s87_cw; /* control word (16bits) */
- uint32_t s87_sw; /* status word (16bits) */
- uint32_t s87_tw; /* tag word (16bits) */
- union fp_addr s87_ip; /* floating point instruction pointer */
-#define s87_opcode s87_ip.fa_32.fa_opcode /* opcode last executed (11bits) */
- union fp_addr s87_dp; /* floating operand offset */
- struct fpacc87 s87_ac[8]; /* accumulator contents, 0-7 */
-};
-#ifndef __lint__
-// Has different packing semantics, adding packed to save87 works
-__CTASSERT(sizeof (struct save87) == 108);
-#endif
-
-/* SSE/SSE2 registers. */
-struct xmmreg {
- uint8_t sse_bytes[16];
-};
-
-/* FPU/MMX/SSE/SSE2 context */
-struct fxsave {
-/*0*/ uint16_t fx_cw; /* FPU Control Word */
- uint16_t fx_sw; /* FPU Status Word */
- uint8_t fx_tw; /* FPU Tag Word (abridged) */
- uint8_t fx_reserved1;
- uint16_t fx_opcode; /* FPU Opcode */
- union fp_addr fx_ip; /* FPU Instruction Pointer */
-/*16*/ union fp_addr fx_dp; /* FPU Data pointer */
- uint32_t fx_mxcsr; /* MXCSR Register State */
- uint32_t fx_mxcsr_mask;
- struct fpaccfx fx_87_ac[8]; /* 8 x87 registers */
- struct xmmreg sv_xmmregs[8]; /* XMM regs */
- uint8_t sv_rsvd[16 * 14];
-} __aligned(16);
-#ifndef __lint__
-// lint does not know aligned
-__CTASSERT(sizeof (struct fxsave) == 512);
-#endif
-
-
-union savefpu {
- struct save87 sv_87;
- struct fxsave sv_xmm;
-};
-
-/*
- * The i387 defaults to Intel extended precision mode and round to nearest,
- * with all exceptions masked.
- */
-#define __INITIAL_NPXCW__ 0x037f
-/* Modern NetBSD uses the default control word.. */
-#define __NetBSD_NPXCW__ 0x037f
-/* NetBSD before 6.99.26 forced IEEE double precision. */
-#define __NetBSD_COMPAT_NPXCW__ 0x127f
-/* FreeBSD leaves some exceptions unmasked as well. */
-#define __FreeBSD_NPXCW__ 0x1272
-/* iBCS2 goes a bit further and leaves the underflow exception unmasked. */
-#define __iBCS2_NPXCW__ 0x0262
-/* Linux just uses the default control word. */
-#define __Linux_NPXCW__ 0x037f
-/* SVR4 uses the same control word as iBCS2. */
-#define __SVR4_NPXCW__ 0x0262
-
-/*
- * The default MXCSR value at reset is 0x1f80, IA-32 Instruction
- * Set Reference, pg. 3-369.
- */
-#define __INITIAL_MXCSR__ 0x1f80
-
-
-/*
- * 80387 control word bits
- */
-#define EN_SW_INVOP 0x0001 /* Invalid operation */
-#define EN_SW_DENORM 0x0002 /* Denormalized operand */
-#define EN_SW_ZERODIV 0x0004 /* Divide by zero */
-#define EN_SW_OVERFLOW 0x0008 /* Overflow */
-#define EN_SW_UNDERFLOW 0x0010 /* Underflow */
-#define EN_SW_PRECLOSS 0x0020 /* Loss of precision */
-#define EN_SW_DATACHAIN 0x0080 /* Data chain exception */
-#define EN_SW_CTL_PREC 0x0300 /* Precision control */
-#define EN_SW_CTL_ROUND 0x0c00 /* Rounding control */
-#define EN_SW_CTL_INF 0x1000 /* Infinity control */
-
-/*
- * The standard control word from finit is 0x37F, giving:
- * round to nearest
- * 64-bit precision
- * all exceptions masked.
- *
- * Now we want:
- * affine mode (if we decide to support 287's)
- * round to nearest
- * 53-bit precision
- * all exceptions masked.
- *
- * 64-bit precision often gives bad results with high level languages
- * because it makes the results of calculations depend on whether
- * intermediate values are stored in memory or in FPU registers.
- *
- * The iBCS control word has underflow, overflow, zero divide, and invalid
- * operation exceptions unmasked. But that causes an unexpected exception
- * in the test program 'paranoia' and makes denormals useless (DBL_MIN / 2
- * underflows). It doesn't make a lot of sense to trap underflow without
- * trapping denormals.
- */
+#include <x86/cpu_extended_state.h>
#ifdef _KERNEL
diff -r 826d96c5ae72 -r 47a6635c318a sys/arch/x86/include/cpu_extended_state.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/x86/include/cpu_extended_state.h Fri Feb 07 19:36:15 2014 +0000
@@ -0,0 +1,242 @@
+/* $NetBSD: cpu_extended_state.h,v 1.1 2014/02/07 19:36:15 dsl Exp $ */
+
+#ifndef _X86_CPU_EXTENDED_STATE_H_
+#define _X86_CPU_EXTENDED_STATE_H_
+
+/*
+ * This file contains definitions of structures that match the memory
+ * layouts used x86 processors to save floating point registers and other
+ * extended cpu state.
+ * This includes registers (etc) used by SSE/SSE2/SSE3/SSSE3/SSE4 and
+ * the later AVX instructions.
+ * The definitions are such that any future 'extended state' should
+ * be handled (provided the kernel doesn't need to know the actual contents.
+ *
+ * The actual structures the cpu accesses must be aligned to 16 for
+ * FXSAVE and 64 for XSAVE. The types aren't aligned because copies
+ * do not need extra alignment.
+ *
+ * The slightly different layout saved by the i387 fsave in also defined.
+ * This is only normally written by pre Pentium II type cpus that don't
+ * support the fxsave instruction.
+ *
+ * Associated save instructions:
+ * FNSAVE: Saves x87 state in 108 bytes (original i387 layout).
+ * Then reinitialies the fpu.
+ * FSAVE: Encodes to FWAIT followed by FNSAVE.
+ * FXSAVE: Saves the x87 state and XMM (aka SSE) registers to the
+ * first 448 (max) bytes of a 512 byte area.
+ * This layout does not match that written by FNSAVE.
+ * XSAVE: Uses the same layout for the x87 and XMM registers,
+ * followed by a 64byte header and separate save areas
+ * for additional extended cpu state.
+ * The x87 state is always saved, the others conditionally.
+ * XSAVEOPT: As XSAVE but (IIRC) only writes the registers blocks
+ * that have been modified.
+ */
+
+#ifdef __lint__
+/* Lint has different packing rules and doesn't understand __aligned() */
+#define __CTASSERT_NOLINT(x) __CTASSERT(1)
+#else
+#define __CTASSERT_NOLINT(x) __CTASSERT(x)
+#endif
+
+/*
+ * Layout for code/data pointers relating to FP exceptions.
+ * Marked 'packed' because they aren't always 64bit aligned.
+ * Since the x86 cpu supports misaligned accesses it isn't
+ * worth avoiding the 'packed' attribute.
+ */
+union fp_addr {
+ uint64_t fa_64; /* Linear address for 64bit systems */
+ struct {
+ uint32_t fa_off; /* linear address for 32 bit */
+ uint16_t fa_seg; /* code/data (etc) segment */
+ uint16_t fa_opcode; /* last opcode (sometimes) */
+ } fa_32;
+} __packed;
+
+/* The x87 registers are 80 bits */
+struct fpacc87 {
+ uint64_t f87_mantissa; /* mantissa */
+ uint16_t f87_exp_sign; /* exponent and sign */
+} __packed;
+
+/* The x87 registers padded out to 16 bytes for fxsave */
+struct fpaccfx {
+ struct fpacc87 r __aligned(16);
+};
+
+/* The SSE/SSE2 registers are 128 bits */
+struct xmmreg {
+ uint8_t xmm_bytes[16];
+};
+
+/* The AVX registers are 256 bits, but the low bits are the xmmregs */
+struct ymmreg {
+ uint8_t ymm_bytes[16];
+};
+
+/*
+ * Floating point unit registers (fsave instruction).
+ * The s87_ac[] and fx_87_ac[] are relative to the stack top.
+ * The 'tag word' contains 2 bits per register and refers to
+ * absolute register numbers.
+ * The cpu sets the tag values 0b01 (zero) and 0b10 (special) when a value
+ * is loaded. The software need only set 0b00 (used) and 0xb11 (unused).
+ * The fxsave 'Abridged tag word' in inverted.
+ */
+struct save87 {
+ uint32_t s87_cw; /* control word (16bits) */
+ uint32_t s87_sw; /* status word (16bits) */
+ uint32_t s87_tw; /* tag word (16bits) */
+ union fp_addr s87_ip; /* floating point instruction pointer */
+#define s87_opcode s87_ip.fa_32.fa_opcode /* opcode last executed (11bits) */
+ union fp_addr s87_dp; /* floating operand offset */
+ struct fpacc87 s87_ac[8]; /* accumulator contents, 0-7 */
+};
+__CTASSERT_NOLINT(sizeof (struct save87) == 108);
+
+/* FPU/MMX/SSE/SSE2 context */
+struct fxsave {
+/*0*/ uint16_t fx_cw; /* FPU Control Word */
+ uint16_t fx_sw; /* FPU Status Word */
+ uint8_t fx_tw; /* FPU Tag Word (abridged) */
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