Import of Linux/MIPS 1.3.0

1 files changed, 171 insertions, 0 deletions

diff --git a/arch/i386/math-emu/fpu_emu.h b/arch/i386/math-emu/fpu_emu.h
new file mode 100644
index 000000000..9d2c5dd13
--- /dev/null
+++ b/arch/i386/math-emu/fpu_emu.h
@@ -0,0 +1,171 @@
+/*---------------------------------------------------------------------------+
+ |  fpu_emu.h                                                                |
+ |                                                                           |
+ | Copyright (C) 1992,1993,1994                                              |
+ |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
+ |                       Australia.  E-mail   billm@vaxc.cc.monash.edu.au    |
+ |                                                                           |
+ +---------------------------------------------------------------------------*/
+
+
+#ifndef _FPU_EMU_H_
+#define _FPU_EMU_H_
+
+/*
+ * Define DENORM_OPERAND to make the emulator detect denormals
+ * and use the denormal flag of the status word. Note: this only
+ * affects the flag and corresponding interrupt, the emulator
+ * will always generate denormals and operate upon them as required.
+ */
+#define DENORM_OPERAND
+
+/*
+ * Define PECULIAR_486 to get a closer approximation to 80486 behaviour,
+ * rather than behaviour which appears to be cleaner.
+ * This is a matter of opinion: for all I know, the 80486 may simply
+ * be complying with the IEEE spec. Maybe one day I'll get to see the
+ * spec...
+ */
+#define PECULIAR_486
+
+#ifdef __ASSEMBLER__
+#include "fpu_asm.h"
+#define	Const(x)	$##x
+#else
+#define	Const(x)	x
+#endif
+
+#define EXP_BIAS	Const(0)
+#define EXP_OVER	Const(0x4000)    /* smallest invalid large exponent */
+#define	EXP_UNDER	Const(-0x3fff)   /* largest invalid small exponent */
+#define EXP_Infinity    EXP_OVER
+#define EXP_NaN         EXP_OVER
+
+#define SIGN_POS	Const(0)
+#define SIGN_NEG	Const(1)
+
+/* Keep the order TW_Valid, TW_Zero, TW_Denormal */
+#define TW_Valid	Const(0)	/* valid */
+#define TW_Zero		Const(1)	/* zero */
+/* The following fold to 2 (Special) in the Tag Word */
+/* #define TW_Denormal     Const(4) */       /* De-normal */
+#define TW_Infinity	Const(5)	/* + or - infinity */
+#define	TW_NaN		Const(6)	/* Not a Number */
+
+#define TW_Empty	Const(7)	/* empty */
+
+
+#ifndef __ASSEMBLER__
+
+#include <linux/math_emu.h>
+#include <linux/linkage.h>
+
+/*
+#define RE_ENTRANT_CHECKING
+ */
+
+#ifdef RE_ENTRANT_CHECKING
+extern char emulating;
+#  define RE_ENTRANT_CHECK_OFF emulating = 0
+#  define RE_ENTRANT_CHECK_ON emulating = 1
+#else
+#  define RE_ENTRANT_CHECK_OFF
+#  define RE_ENTRANT_CHECK_ON
+#endif RE_ENTRANT_CHECKING
+
+#define FWAIT_OPCODE 0x9b
+#define OP_SIZE_PREFIX 0x66
+#define ADDR_SIZE_PREFIX 0x67
+#define PREFIX_CS 0x2e
+#define PREFIX_DS 0x3e
+#define PREFIX_ES 0x26
+#define PREFIX_SS 0x36
+#define PREFIX_FS 0x64
+#define PREFIX_GS 0x65
+#define PREFIX_REPE 0xf3
+#define PREFIX_REPNE 0xf2
+#define PREFIX_LOCK 0xf0
+#define PREFIX_CS_ 1
+#define PREFIX_DS_ 2
+#define PREFIX_ES_ 3
+#define PREFIX_FS_ 4
+#define PREFIX_GS_ 5
+#define PREFIX_SS_ 6
+#define PREFIX_DEFAULT 7
+
+struct address {
+  unsigned int offset;
+  unsigned int selector:16;
+  unsigned int opcode:11;
+  unsigned int empty:5;
+};
+typedef void (*FUNC)(void);
+typedef struct fpu_reg FPU_REG;
+typedef void (*FUNC_ST0)(FPU_REG *st0_ptr);
+typedef struct { unsigned char address_size, operand_size, segment; }
+        overrides;
+/* This structure is 32 bits: */
+typedef struct { overrides override;
+		 unsigned char default_mode; } fpu_addr_modes;
+/* PROTECTED has a restricted meaning in the emulator; it is used
+   to signal that the emulator needs to do special things to ensure
+   that protection is respected in a segmented model. */
+#define PROTECTED 4
+#define SIXTEEN   1         /* We rely upon this being 1 (true) */
+#define VM86      SIXTEEN
+#define PM16      (SIXTEEN | PROTECTED)
+#define SEG32     PROTECTED
+extern unsigned char const data_sizes_16[32];
+
+#define	st(x)	( regs[((top+x) &7 )] )
+
+#define	STACK_OVERFLOW	(st_new_ptr = &st(-1), st_new_ptr->tag != TW_Empty)
+#define	NOT_EMPTY(i)	(st(i).tag != TW_Empty)
+#define	NOT_EMPTY_ST0	(st0_tag ^ TW_Empty)
+
+#define pop()	{ regs[(top++ & 7 )].tag = TW_Empty; }
+#define poppop() { regs[((top + 1) & 7 )].tag \
+		     = regs[(top & 7 )].tag = TW_Empty; \
+		   top += 2; }
+
+/* push() does not affect the tags */
+#define push()	{ top--; }
+
+
+#define reg_move(x, y) { \
+		 *(short *)&((y)->sign) = *(short *)&((x)->sign); \
+		 *(long *)&((y)->exp) = *(long *)&((x)->exp); \
+		 *(long long *)&((y)->sigl) = *(long long *)&((x)->sigl); }
+
+#define significand(x) ( ((unsigned long long *)&((x)->sigl))[0] )
+
+
+/*----- Prototypes for functions written in assembler -----*/
+/* extern void reg_move(FPU_REG *a, FPU_REG *b); */
+
+asmlinkage void normalize(FPU_REG *x);
+asmlinkage void normalize_nuo(FPU_REG *x);
+asmlinkage int reg_div(FPU_REG const *arg1, FPU_REG const *arg2,
+		       FPU_REG *answ, unsigned int control_w);
+asmlinkage int reg_u_sub(FPU_REG const *arg1, FPU_REG const *arg2,
+			 FPU_REG *answ, unsigned int control_w);
+asmlinkage int reg_u_mul(FPU_REG const *arg1, FPU_REG const *arg2,
+			 FPU_REG *answ, unsigned int control_w);
+asmlinkage int reg_u_div(FPU_REG const *arg1, FPU_REG const *arg2,
+			 FPU_REG *answ, unsigned int control_w);
+asmlinkage int reg_u_add(FPU_REG const *arg1, FPU_REG const *arg2,
+			 FPU_REG *answ, unsigned int control_w);
+asmlinkage int wm_sqrt(FPU_REG *n, unsigned int control_w);
+asmlinkage unsigned	shrx(void *l, unsigned x);
+asmlinkage unsigned	shrxs(void *v, unsigned x);
+asmlinkage unsigned long div_small(unsigned long long *x, unsigned long y);
+asmlinkage void round_reg(FPU_REG *arg, unsigned int extent,
+		      unsigned int control_w);
+
+#ifndef MAKING_PROTO
+#include "fpu_proto.h"
+#endif
+
+#endif __ASSEMBLER__
+
+#endif _FPU_EMU_H_