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/*---------------------------------------------------------------------------+

 |  fpu_system.h                                                             |

 |                                                                           |

 | Copyright (C) 1992,1994                                                   |

 |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |

 |                       Australia.  E-mail   billm@vaxc.cc.monash.edu.au    |

 |                                                                           |

 +---------------------------------------------------------------------------*/

#ifndef _FPU_SYSTEM_H

#define _FPU_SYSTEM_H

/* system dependent definitions */

#include <linux/sched.h>

#include <linux/kernel.h>

#include <linux/mm.h>

/* This sets the pointer FPU_info to point to the argument part

   of the stack frame of math_emulate() */

#define SETUP_DATA_AREA(arg)    FPU_info = (struct info *) &arg

#define LDT_DESCRIPTOR(s)       (current->ldt[(s) >> 3])

#define SEG_D_SIZE(x)           ((x).b & (3 << 21))

#define SEG_G_BIT(x)            ((x).b & (1 << 23))

#define SEG_GRANULARITY(x)      (((x).b & (1 << 23)) ? 4096 : 1)

#define SEG_286_MODE(x)         ((x).b & ( 0xff000000 | 0xf0000 | (1 << 23)))

#define SEG_BASE_ADDR(s)        (((s).b & 0xff000000) \

                                 | (((s).b & 0xff) << 16) | ((s).a >> 16))

#define SEG_LIMIT(s)            (((s).b & 0xff0000) | ((s).a & 0xffff))

#define SEG_EXECUTE_ONLY(s)     (((s).b & ((1 << 11) | (1 << 9))) == (1 << 11))

#define SEG_WRITE_PERM(s)       (((s).b & ((1 << 11) | (1 << 9))) == (1 << 9))

#define SEG_EXPAND_DOWN(s)      (((s).b & ((1 << 11) | (1 << 10))) \

                                 == (1 << 10))

#define I387                    (current->tss.i387)

#define FPU_info                (I387.soft.info)

#define FPU_CS                  (*(unsigned short *) &(FPU_info->___cs))

#define FPU_SS                  (*(unsigned short *) &(FPU_info->___ss))

#define FPU_DS                  (*(unsigned short *) &(FPU_info->___ds))

#define FPU_EAX                 (FPU_info->___eax)

#define FPU_EFLAGS              (FPU_info->___eflags)

#define FPU_EIP                 (FPU_info->___eip)

#define FPU_ORIG_EIP            (FPU_info->___orig_eip)

#define FPU_lookahead           (I387.soft.lookahead)

/* nz if ip_offset and cs_selector are not to be set for the current

   instruction. */

#define no_ip_update            (((char *)&(I387.soft.twd))[0])

#define FPU_rm                  (((unsigned char *)&(I387.soft.twd))[1])

/* Number of bytes of data which can be legally accessed by the current

   instruction. This only needs to hold a number <= 108, so a byte will do. */

#define access_limit            (((unsigned char *)&(I387.soft.twd))[2])

#define partial_status          (I387.soft.swd)

#define control_word            (I387.soft.cwd)

#define regs                    (I387.soft.regs)

#define top                     (I387.soft.top)

#define instruction_address     (*(struct address *)&I387.soft.fip)

#define operand_address         (*(struct address *)&I387.soft.foo)

#define FPU_verify_area(x,y,z)  if ( verify_area(x,y,z) ) \

                                math_abort(FPU_info,SIGSEGV)

#undef FPU_IGNORE_CODE_SEGV

#ifdef FPU_IGNORE_CODE_SEGV

/* verify_area() is very expensive, and causes the emulator to run

   about 20% slower if applied to the code. Anyway, errors due to bad

   code addresses should be much rarer than errors due to bad data

   addresses. */

#define FPU_code_verify_area(z)

#else

/* A simpler test than verify_area() can probably be done for

   FPU_code_verify_area() because the only possible error is to step

   past the upper boundary of a legal code area. */

#define FPU_code_verify_area(z) FPU_verify_area(VERIFY_READ,(void *)FPU_EIP,z)

#endif

#endif