2.9BSD - /usr/include/sys/koverlay.h

   1: /*
   2:  *	Definitions relating to kernel text overlays.  The kernel and
   3:  *	stand/bootstrap/boot.c must be recompiled if these are changed.
   4:  *	In practice, it is very difficult to change these numbers since
   5:  *	many changes will be necessary in mch.s.  This file is provided
   6:  *	mainly to specify how kernel overlays are laid out, not for tuning.
   7:  *
   8:  *
   9:  *	Primary variables:
  10:  *		# ovly regs	the maximum size of a kernel
  11:  *				overlay segment will be
  12:  *				8k bytes * # ovly regs.
  13:  *				Currently, must be 1.
  14:  *
  15:  *		OVLY_TABLE_BASE	the address in l.s where the
  16:  *				kernel stores the prototype
  17:  *				PARs and PDRs.  The only one
  18:  *				of the constants in this file
  19:  *				which may readily be changed.
  20:  *
  21:  *		NUM_TEXT_REGS	the maximum size of the kernel
  22:  *				base text segment will be
  23:  *				8k bytes * NUM_TEXT_REGS.
  24:  */
  25: 
  26: #define OVLY_TABLE_BASE     01000
  27: 
  28: #define I_NUM_TEXT_REGS     7   /* 8 - # ovly regs */
  29: #define N_NUM_TEXT_REGS     2
  30: #ifndef KERN_NONSEP
  31: #define NUM_TEXT_REGS       I_NUM_TEXT_REGS
  32: #else
  33: #define NUM_TEXT_REGS       N_NUM_TEXT_REGS
  34: #endif	KERN_NONSEP
  35: 
  36: #define I_MAX_DATA_REGS     6
  37: #define N_MAX_DATA_REGS     3   /* 6 - NUM_TEXT_REGS - # ovly regs */
  38: #ifndef KERN_NONSEP
  39: #define MAX_DATA_REGS       I_MAX_DATA_REGS
  40: #else
  41: #define MAX_DATA_REGS       N_MAX_DATA_REGS
  42: #endif	KERN_NONSEP
  43: 
  44: #define I_DATA_PAR_BASE     KDSA0
  45: #define N_DATA_PAR_BASE     KISA3   /* &KISA[NUM_TEXT_REGS + # ovly regs] */
  46: #ifndef KERN_NONSEP
  47: #define DATA_PAR_BASE       I_DATA_PAR_BASE
  48: #else
  49: #define DATA_PAR_BASE       N_DATA_PAR_BASE
  50: #endif	KERN_NONSEP
  51: 
  52: #define I_DATA_PDR_BASE     KDSD0
  53: #define N_DATA_PDR_BASE     KISD3   /* &KISD[NUM_TEXT_REGS + # ovly regs] */
  54: #ifndef KERN_NONSEP
  55: #define DATA_PDR_BASE       I_DATA_PDR_BASE
  56: #else
  57: #define DATA_PDR_BASE       N_DATA_PDR_BASE
  58: #endif	KERN_NONSEP
  59: 
  60: #define TEXT_PAR_BASE       KISA0
  61: #define TEXT_PDR_BASE       KISD0
  62: #ifdef  KERN_NONSEP
  63: #define OVLY_PAR        KISA2   /* &KISA[NUM_TEXT_REGS] */
  64: #define OVLY_PDR        KISD2   /* &KISD[NUM_TEXT_REGS] */
  65: #else
  66: #define OVLY_PAR        KISA7   /* &KISA[NUM_TEXT_REGS] */
  67: #define OVLY_PDR        KISD7   /* &KISD[NUM_TEXT_REGS] */
  68: #endif

Defined macros

Usage of this include