mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-18 17:54:13 +08:00
d6dd61c831
Add hooks to allow a paravirt implementation to track the lifetime of an mm. Paravirtualization requires three hooks, but only two are needed in common code. They are: arch_dup_mmap, which is called when a new mmap is created at fork arch_exit_mmap, which is called when the last process reference to an mm is dropped, which typically happens on exit and exec. The third hook is activate_mm, which is called from the arch-specific activate_mm() macro/function, and so doesn't need stub versions for other architectures. It's called when an mm is first used. Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Andi Kleen <ak@suse.de> Cc: linux-arch@vger.kernel.org Cc: James Bottomley <James.Bottomley@SteelEye.com> Acked-by: Ingo Molnar <mingo@elte.hu>
209 lines
4.9 KiB
C
209 lines
4.9 KiB
C
#ifndef __ASM_SH64_MMU_CONTEXT_H
|
|
#define __ASM_SH64_MMU_CONTEXT_H
|
|
|
|
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* include/asm-sh64/mmu_context.h
|
|
*
|
|
* Copyright (C) 2000, 2001 Paolo Alberelli
|
|
* Copyright (C) 2003 Paul Mundt
|
|
*
|
|
* ASID handling idea taken from MIPS implementation.
|
|
*
|
|
*/
|
|
|
|
#ifndef __ASSEMBLY__
|
|
|
|
/*
|
|
* Cache of MMU context last used.
|
|
*
|
|
* The MMU "context" consists of two things:
|
|
* (a) TLB cache version (or cycle, top 24 bits of mmu_context_cache)
|
|
* (b) ASID (Address Space IDentifier, bottom 8 bits of mmu_context_cache)
|
|
*/
|
|
extern unsigned long mmu_context_cache;
|
|
|
|
#include <asm/page.h>
|
|
#include <asm-generic/mm_hooks.h>
|
|
|
|
/* Current mm's pgd */
|
|
extern pgd_t *mmu_pdtp_cache;
|
|
|
|
#define SR_ASID_MASK 0xffffffffff00ffffULL
|
|
#define SR_ASID_SHIFT 16
|
|
|
|
#define MMU_CONTEXT_ASID_MASK 0x000000ff
|
|
#define MMU_CONTEXT_VERSION_MASK 0xffffff00
|
|
#define MMU_CONTEXT_FIRST_VERSION 0x00000100
|
|
#define NO_CONTEXT 0
|
|
|
|
/* ASID is 8-bit value, so it can't be 0x100 */
|
|
#define MMU_NO_ASID 0x100
|
|
|
|
|
|
/*
|
|
* Virtual Page Number mask
|
|
*/
|
|
#define MMU_VPN_MASK 0xfffff000
|
|
|
|
static inline void
|
|
get_new_mmu_context(struct mm_struct *mm)
|
|
{
|
|
extern void flush_tlb_all(void);
|
|
extern void flush_cache_all(void);
|
|
|
|
unsigned long mc = ++mmu_context_cache;
|
|
|
|
if (!(mc & MMU_CONTEXT_ASID_MASK)) {
|
|
/* We exhaust ASID of this version.
|
|
Flush all TLB and start new cycle. */
|
|
flush_tlb_all();
|
|
/* We have to flush all caches as ASIDs are
|
|
used in cache */
|
|
flush_cache_all();
|
|
/* Fix version if needed.
|
|
Note that we avoid version #0/asid #0 to distingush NO_CONTEXT. */
|
|
if (!mc)
|
|
mmu_context_cache = mc = MMU_CONTEXT_FIRST_VERSION;
|
|
}
|
|
mm->context = mc;
|
|
}
|
|
|
|
/*
|
|
* Get MMU context if needed.
|
|
*/
|
|
static __inline__ void
|
|
get_mmu_context(struct mm_struct *mm)
|
|
{
|
|
if (mm) {
|
|
unsigned long mc = mmu_context_cache;
|
|
/* Check if we have old version of context.
|
|
If it's old, we need to get new context with new version. */
|
|
if ((mm->context ^ mc) & MMU_CONTEXT_VERSION_MASK)
|
|
get_new_mmu_context(mm);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Initialize the context related info for a new mm_struct
|
|
* instance.
|
|
*/
|
|
static inline int init_new_context(struct task_struct *tsk,
|
|
struct mm_struct *mm)
|
|
{
|
|
mm->context = NO_CONTEXT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Destroy context related info for an mm_struct that is about
|
|
* to be put to rest.
|
|
*/
|
|
static inline void destroy_context(struct mm_struct *mm)
|
|
{
|
|
extern void flush_tlb_mm(struct mm_struct *mm);
|
|
|
|
/* Well, at least free TLB entries */
|
|
flush_tlb_mm(mm);
|
|
}
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
/* Common defines */
|
|
#define TLB_STEP 0x00000010
|
|
#define TLB_PTEH 0x00000000
|
|
#define TLB_PTEL 0x00000008
|
|
|
|
/* PTEH defines */
|
|
#define PTEH_ASID_SHIFT 2
|
|
#define PTEH_VALID 0x0000000000000001
|
|
#define PTEH_SHARED 0x0000000000000002
|
|
#define PTEH_MATCH_ASID 0x00000000000003ff
|
|
|
|
#ifndef __ASSEMBLY__
|
|
/* This has to be a common function because the next location to fill
|
|
* information is shared. */
|
|
extern void __do_tlb_refill(unsigned long address, unsigned long long is_text_not_data, pte_t *pte);
|
|
|
|
/* Profiling counter. */
|
|
#ifdef CONFIG_SH64_PROC_TLB
|
|
extern unsigned long long calls_to_do_fast_page_fault;
|
|
#endif
|
|
|
|
static inline unsigned long get_asid(void)
|
|
{
|
|
unsigned long long sr;
|
|
|
|
asm volatile ("getcon " __SR ", %0\n\t"
|
|
: "=r" (sr));
|
|
|
|
sr = (sr >> SR_ASID_SHIFT) & MMU_CONTEXT_ASID_MASK;
|
|
return (unsigned long) sr;
|
|
}
|
|
|
|
/* Set ASID into SR */
|
|
static inline void set_asid(unsigned long asid)
|
|
{
|
|
unsigned long long sr, pc;
|
|
|
|
asm volatile ("getcon " __SR ", %0" : "=r" (sr));
|
|
|
|
sr = (sr & SR_ASID_MASK) | (asid << SR_ASID_SHIFT);
|
|
|
|
/*
|
|
* It is possible that this function may be inlined and so to avoid
|
|
* the assembler reporting duplicate symbols we make use of the gas trick
|
|
* of generating symbols using numerics and forward reference.
|
|
*/
|
|
asm volatile ("movi 1, %1\n\t"
|
|
"shlli %1, 28, %1\n\t"
|
|
"or %0, %1, %1\n\t"
|
|
"putcon %1, " __SR "\n\t"
|
|
"putcon %0, " __SSR "\n\t"
|
|
"movi 1f, %1\n\t"
|
|
"ori %1, 1 , %1\n\t"
|
|
"putcon %1, " __SPC "\n\t"
|
|
"rte\n"
|
|
"1:\n\t"
|
|
: "=r" (sr), "=r" (pc) : "0" (sr));
|
|
}
|
|
|
|
/*
|
|
* 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_context(struct mm_struct *mm)
|
|
{
|
|
get_mmu_context(mm);
|
|
set_asid(mm->context & MMU_CONTEXT_ASID_MASK);
|
|
}
|
|
|
|
|
|
static __inline__ void switch_mm(struct mm_struct *prev,
|
|
struct mm_struct *next,
|
|
struct task_struct *tsk)
|
|
{
|
|
if (prev != next) {
|
|
mmu_pdtp_cache = next->pgd;
|
|
activate_context(next);
|
|
}
|
|
}
|
|
|
|
#define deactivate_mm(tsk,mm) do { } while (0)
|
|
|
|
#define activate_mm(prev, next) \
|
|
switch_mm((prev),(next),NULL)
|
|
|
|
static inline void
|
|
enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
|
|
{
|
|
}
|
|
|
|
#endif /* __ASSEMBLY__ */
|
|
|
|
#endif /* __ASM_SH64_MMU_CONTEXT_H */
|