arch/ppc/kernel/mol.h

   1 /*
   2  *   arch/ppc/kernel/mol.h
   3  *
   4  *      <mol.h>
   5  *
   6  *      Mac-on-Linux hook macros
   7  *      <http://www.maconlinux.org>
   8  *
   9  *   Copyright (C) 2000 Samuel Rydh (samuel@ibrium.se)
  10  *
  11  *   This program is free software; you can redistribute it and/or
  12  *   modify it under the terms of the GNU General Public License
  13  *   as published by the Free Software Foundation
  14  *
  15  */
  16
  17 #ifndef _PPC_KERNEL_MOL
  18 #define _PPC_KERNEL_MOL
  19
  20 #include <linux/config.h>
  21
  22 #ifdef CONFIG_MOL
  23 #define MOL_INTERFACE_VERSION           3
  24
  25 #define MOL_HOOK(hook_num)                                      \
  26         lwz     r0,(mol_interface + 4 * hook_num + 4)@l(0);     \
  27         cmpwi   cr1,r0,0;                                       \
  28         beq+    cr1,777f;                                       \
  29         mtctr   r0;                                             \
  30         bctrl;                                                  \
  31 777:    lwz     r0,GPR0(r21)
  32
  33 #define MOL_HOOK_RESTORE(hook_num)                              \
  34         mfcr    r2;                                             \
  35         MOL_HOOK(hook_num);                                     \
  36         mtcrf   0x80,r2;                                        \
  37         lwz     r2,_CTR(r21);                                   \
  38         mtctr   r2;                                             \
  39         lwz     r2,GPR2(r21)
  40
  41 #define MOL_HOOK_MMU(hook_num, scr)                             \
  42         lis     scr,(mol_interface + 4 * hook_num + 4)@ha;      \
  43         lwz     scr,(mol_interface + 4 * hook_num + 4)@l(scr);  \
  44         cmpwi   cr1,scr,0;                                      \
  45         beq+    cr1,778f;                                       \
  46         mtctr   scr;                                            \
  47         bctrl;                                                  \
  48 778:
  49
  50 #define MOL_HOOK_TLBMISS(hook_num)                              \
  51         lwz     r0,(mol_interface + 4 * hook_num + 4)@l(0);     \
  52         cmpwi   r0,0;                                           \
  53         beq+    779f;                                           \
  54         mflr    r3;                                             \
  55         mtlr    r0;                                             \
  56         blrl;                                                   \
  57         mtlr    r3;                                             \
  58 779:
  59
  60 #else
  61 #define MOL_HOOK(num)
  62 #define MOL_HOOK_RESTORE(num)
  63 #define MOL_HOOK_MMU(num, scr)
  64 #define MOL_HOOK_TLBMISS(num)
  65 #endif
  66
  67
  68 #endif   /* _PPC_KERNEL_MOL */