mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-28 07:04:00 +08:00
1f8d419e29
This patch started as simply removing a few never-used macros from asm-ppc64/pgtable.h, then kind of grew. It now makes a bunch of cleanups to the ppc64 low-level header files (with corresponding changes to .c files where necessary) such as: - Abolishing never-used macros - Eliminating multiple #defines with the same purpose - Removing pointless macros (cases where just expanding the macro everywhere turns out clearer and more sensible) - Removing some cases where macros which could be defined in terms of each other weren't - Moving imalloc() related definitions from pgtable.h to their own header file (imalloc.h) - Re-arranging headers to group things more logically - Moving all VSID allocation related things to mmu.h, instead of being split between mmu.h and mmu_context.h - Removing some reserved space for flags from the PMD - we're not using it. - Fix some bugs which broke compile with STRICT_MM_TYPECHECKS. Signed-off-by: David Gibson <dwg@au1.ibm.com> Acked-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
#ifndef __PPC64_MMU_CONTEXT_H
|
|
#define __PPC64_MMU_CONTEXT_H
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <asm/mmu.h>
|
|
#include <asm/cputable.h>
|
|
|
|
/*
|
|
* Copyright (C) 2001 PPC 64 Team, IBM Corp
|
|
*
|
|
* 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; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
/*
|
|
* Every architecture must define this function. It's the fastest
|
|
* way of searching a 140-bit bitmap where the first 100 bits are
|
|
* unlikely to be set. It's guaranteed that at least one of the 140
|
|
* bits is cleared.
|
|
*/
|
|
static inline int sched_find_first_bit(unsigned long *b)
|
|
{
|
|
if (unlikely(b[0]))
|
|
return __ffs(b[0]);
|
|
if (unlikely(b[1]))
|
|
return __ffs(b[1]) + 64;
|
|
return __ffs(b[2]) + 128;
|
|
}
|
|
|
|
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
|
|
{
|
|
}
|
|
|
|
#define NO_CONTEXT 0
|
|
#define MAX_CONTEXT (0x100000-1)
|
|
|
|
extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
|
|
extern void destroy_context(struct mm_struct *mm);
|
|
|
|
extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm);
|
|
extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
|
|
|
|
/*
|
|
* switch_mm is the entry point called from the architecture independent
|
|
* code in kernel/sched.c
|
|
*/
|
|
static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
|
|
struct task_struct *tsk)
|
|
{
|
|
if (!cpu_isset(smp_processor_id(), next->cpu_vm_mask))
|
|
cpu_set(smp_processor_id(), next->cpu_vm_mask);
|
|
|
|
/* No need to flush userspace segments if the mm doesnt change */
|
|
if (prev == next)
|
|
return;
|
|
|
|
#ifdef CONFIG_ALTIVEC
|
|
if (cpu_has_feature(CPU_FTR_ALTIVEC))
|
|
asm volatile ("dssall");
|
|
#endif /* CONFIG_ALTIVEC */
|
|
|
|
if (cpu_has_feature(CPU_FTR_SLB))
|
|
switch_slb(tsk, next);
|
|
else
|
|
switch_stab(tsk, next);
|
|
}
|
|
|
|
#define deactivate_mm(tsk,mm) do { } while (0)
|
|
|
|
/*
|
|
* After we have set current->mm to a new value, this activates
|
|
* the context for the new mm so we see the new mappings.
|
|
*/
|
|
static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
|
|
{
|
|
unsigned long flags;
|
|
|
|
local_irq_save(flags);
|
|
switch_mm(prev, next, current);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
#endif /* __PPC64_MMU_CONTEXT_H */
|