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/*
* Creation Date: <2000/08/06 01:27:53 samuel>
* Time-stamp: <2001/09/22 14:20:57 samuel>
*
* <compat.h>
*
* Kernel Compatibility Definitions
*
* Copyright (C) 2000, 2001 Samuel Rydh (samuel@ibrium.se)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation
*
*/
#ifndef _H_COMPAT
#define _H_COMPAT
#include <linux/version.h>
#ifndef __ASSEMBLY__
#include <asm/atomic.h>
#include <linux/sched.h> /* needed by <asm/mmu_context.h> */
#include <asm/mmu_context.h>
#include <asm/time.h>
#include "molif.h"
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
#define LINUX_24
#endif
#ifndef __ASSEMBLY__
// We detect Paul's new MM implementation by the absence of MUNGE_CONTEXT
// The linux-MM change was introduced in 2.4.6
#ifndef MUNGE_CONTEXT
#define NEW_LINUX_MM
#endif
// Symbols exported from the module molsymglueN.o
extern ulong msym_flush_hash_page, msym_handle_mm_fault, msym_next_mmu_context;
extern molif_t mol_interface; /* exported by old, patched kernels */
struct vm_area_struct;
struct mm_struct;
struct task_struct;
struct _PTE;
extern ulong *mc_flush_hash_page;
extern atomic_t *mc_next_mmu_context;
extern molif_t *mc_molif;
#ifdef LINUX_24
extern int (*mc_handle_mm_fault)( struct mm_struct *mm,
struct vm_area_struct *vma,
unsigned long addr, int write_access);
#else
extern int (*mc_handle_mm_fault)( struct task_struct *tsk,
struct vm_area_struct *vma,
unsigned long addr, int write_access );
extern ulong mc_giveup_altivec;
#endif /* LINUX_24 */
extern int linux_vers;
#ifdef LINUX_24
#define compat_clear_page(x) clear_page( (void*)(x) );
#else
#define compat_clear_page(x) clear_page( x );
#endif
#ifdef LINUX_24
extern inline void _tlbie(unsigned long va)
{
asm volatile ("tlbie %0" : : "r"(va));
}
#endif
// The mmap mm->mmap_sem semaphore changed in 2.4.3-pre5 from
// semaphore to rw_semaphore.
extern void _compat_mmap_sem_up( void *sem );
extern void _compat_mmap_sem_down( void *sem );
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,3,0)
#define MMAP_SEM_UP(x) up(x)
#define MMAP_SEM_DOWN(x) down(x)
#else
#define MMAP_SEM_UP(x) _compat_mmap_sem_up(x)
#define MMAP_SEM_DOWN(x) _compat_mmap_sem_down(x)
#endif
// atomic_add_return is not exported in 2.2.
#ifdef LINUX_24
#define compat_atomic_add_return(a,v) atomic_add_return(a,v)
#else
static __inline__ int compat_atomic_add_return(int a, atomic_t *v) {
int t;
__asm__ __volatile__("\n\
1: lwarx %0,0,%3\n\
add %0,%2,%0\n\
stwcx. %0,0,%3\n\
bne- 1b"
: "=&r" (t), "=m" (v->counter)
: "r" (a), "r" (v), "m" (v->counter)
: "cc");
return t;
}
#endif
#ifdef LINUX_24
#define CURRENT_MM (current->mm)
#else
/* Use CURRENT_MM instead of current->mm. This makes the MOL module
* less kernel version dependent. If the module is compiled with the
* correct headers, __current_mm_offs will always contain the correct offset.
*/
#define CURRENT_MM (*(struct mm_struct**)((char*)current + __current_mm_offs ))
extern int __current_mm_offs;
#endif
#ifdef LINUX_24
#define compat_clear_page_reserved( ptr ) ClearPageReserved( virt_to_page(ptr))
#define compat_set_page_reserved( ptr ) SetPageReserved( virt_to_page(ptr) )
#else
#define compat_clear_page_reserved( ptr ) clear_bit( PG_reserved, &mem_map[MAP_NR(ptr)].flags );
#define compat_set_page_reserved( ptr ) set_bit( PG_reserved, &mem_map[MAP_NR(ptr)].flags )
#endif
#endif /* __ASSEMBLY__ */
#ifdef LINUX_24
#define get_tb_frequency() ( tb_ticks_per_jiffy * HZ )
#else
#define get_tb_frequency() 0 /* not available on 2.2 */
#endif
#endif /* _H_COMPAT */
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