/*
* linux/include/asm-arm/tlbflush.h
*
* Copyright (C) 1999-2003 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _ASMARM_TLBFLUSH_H
#define _ASMARM_TLBFLUSH_H
#include <linux/config.h>
#include <asm/glue.h>
#define TLB_V3_PAGE (1 << 0)
#define TLB_V4_U_PAGE (1 << 1)
#define TLB_V4_D_PAGE (1 << 2)
#define TLB_V4_I_PAGE (1 << 3)
#define TLB_V6_U_PAGE (1 << 4)
#define TLB_V6_D_PAGE (1 << 5)
#define TLB_V6_I_PAGE (1 << 6)
#define TLB_V3_FULL (1 << 8)
#define TLB_V4_U_FULL (1 << 9)
#define TLB_V4_D_FULL (1 << 10)
#define TLB_V4_I_FULL (1 << 11)
#define TLB_V6_U_FULL (1 << 12)
#define TLB_V6_D_FULL (1 << 13)
#define TLB_V6_I_FULL (1 << 14)
#define TLB_V6_U_ASID (1 << 16)
#define TLB_V6_D_ASID (1 << 17)
#define TLB_V6_I_ASID (1 << 18)
#define TLB_DCLEAN (1 << 30)
#define TLB_WB (1 << 31)
/*
* MMU TLB Model
* =============
*
* We have the following to choose from:
* v3 - ARMv3
* v4 - ARMv4 without write buffer
* v4wb - ARMv4 with write buffer without I TLB flush entry instruction
* v4wbi - ARMv4 with write buffer with I TLB flush entry instruction
* v6wbi - ARMv6 with write buffer with I TLB flush entry instruction
*/
#undef _TLB
#undef MULTI_TLB
#define v3_tlb_flags (TLB_V3_FULL | TLB_V3_PAGE)
#ifdef CONFIG_CPU_TLB_V3
# define v3_possible_flags v3_tlb_flags
# define v3_always_flags v3_tlb_flags
# ifdef _TLB
# define MULTI_TLB 1
# else
# define _TLB v3
# endif
#else
# define v3_possible_flags 0
# define v3_always_flags (-1UL)
#endif
#define v4_tlb_flags (TLB_V4_U_FULL | TLB_V4_U_PAGE)
#ifdef CONFIG_CPU_TLB_V4WT
# define v4_possible_flags v4_tlb_flags
# define v4_always_flags v4_tlb_flags
# ifdef _TLB
# define MULTI_TLB 1
# else
# define _TLB v4
# endif
#else
# define v4_possible_flags 0
# define v4_always_flags (-1UL)
#endif
#define v4wbi_tlb_flags (TLB_WB | TLB_DCLEAN | \
TLB_V4_I_FULL | TLB_V4_D_FULL | \
TLB_V4_I_PAGE | TLB_V4_D_PAGE)
#ifdef CONFIG_CPU_TLB_V4WBI
# define v4wbi_possible_flags v4wbi_tlb_flags
# define v4wbi_always_flags v4wbi_tlb_flags
# ifdef _TLB
# define MULTI_TLB 1
# else
# define _TLB v4wbi
# endif
#else
# define v4wbi_possible_flags 0
# define v4wbi_always_flags (-1UL)
#endif
#define v4wb_tlb_flags (TLB_WB | TLB_DCLEAN | \
TLB_V4_I_FULL | TLB_V4_D_FULL | \
TLB_V4_D_PAGE)
#ifdef CONFIG_CPU_TLB_V4WB
# define v4wb_possible_flags v4wb_tlb_flags
# define v4wb_always_flags v4wb_tlb_flags
# ifdef _TLB
# define MULTI_TLB 1
# else
# define _TLB v4wb
# endif
#else
# define v4wb_possible_flags 0
# define v4wb_always_flags (-1UL)
#endif
#define v6wbi_tlb_flags (TLB_WB | TLB_DCLEAN | \
TLB_V6_I_FULL | TLB_V6_D_FULL | \
TLB_V6_I_PAGE | TLB_V6_D_PAGE | \
TLB_V6_I_ASID | TLB_V6_D_ASID)
#ifdef CONFIG_CPU_TLB_V6
# define v6wbi_possible_flags v6wbi_tlb_flags
# define v6wbi_always_flags v6wbi_tlb_flags
# ifdef _TLB
# define MULTI_TLB 1
# else
# define _TLB v6wbi
# endif
#else
# define v6wbi_possible_flags 0
# define v6wbi_always_flags (-1UL)
#endif
#ifndef _TLB
#error Unknown TLB model
#endif
#ifndef __ASSEMBLY__
struct cpu_tlb_fns {
void (*flush_user_range)(unsigned long, unsigned long, struct vm_area_struct *);
void (*flush_kern_range)(unsigned long, unsigned long);
unsigned long tlb_flags;
};
/*
* Select the calling method
*/
#ifdef MULTI_TLB
#define __cpu_flush_user_tlb_range cpu_tlb.flush_user_range
#define __cpu_flush_kern_tlb_range cpu_tlb.flush_kern_range
#else
#define __cpu_flush_user_tlb_range __glue(_TLB,_flush_user_tlb_range)
#define __cpu_flush_kern_tlb_range __glue(_TLB,_flush_kern_tlb_range)
extern void __cpu_flush_user_tlb_range(unsigned long, unsigned long, struct vm_area_struct *);
extern void __cpu_flush_kern_tlb_range(unsigned long, unsigned long);
#endif
extern struct cpu_tlb_fns cpu_tlb;
#define __cpu_tlb_flags cpu_tlb.tlb_flags
/*
* TLB Management
* ==============
*
* The arch/arm/mm/tlb-*.S files implement these methods.
*
* The TLB specific code is expected to perform whatever tests it
* needs to determine if it should invalidate the TLB for each
* call. Start addresses are inclusive and end addresses are
* exclusive; it is safe to round these addresses down.
*
* flush_tlb_all()
*
* Invalidate the entire TLB.
*
* flush_tlb_mm(mm)
*
* Invalidate all TLB entries in a particular address
* space.
* - mm - mm_struct describing address space
*
* flush_tlb_range(mm,start,end)
*
* Invalidate a range of TLB entries in the specified
* address space.
* - mm - mm_struct describing address space
* - start - start address (may not be aligned)
* - end - end address (exclusive, may not be aligned)
*
* flush_tlb_page(vaddr,vma)
*
* Invalidate the specified page in the specified address range.
* - vaddr - virtual address (may not be aligned)
* - vma - vma_struct describing address range
*
* flush_kern_tlb_page(kaddr)
*
* Invalidate the TLB entry for the specified page. The address
* will be in the kernels virtual memory space. Current uses
* only require the D-TLB to be invalidated.
* - kaddr - Kernel virtual memory address
*/
/*
* We optimise the code below by:
* - building a set of TLB flags that might be set in __cpu_tlb_flags
* - building a set of TLB flags that will always be set in __cpu_tlb_flags
* - if we're going to need __cpu_tlb_flags, access it once and only once
*
* This allows us to build optimal assembly for the single-CPU type case,
* and as close to optimal given the compiler constrants for multi-CPU
* case. We could do better for the multi-CPU case if the compiler
* implemented the "%?" method, but this has been discontinued due to too
* many people getting it wrong.
*/
#define possible_tlb_flags (v3_possible_flags | \
v4_possible_flags | \
v4wbi_possible_flags | \
v4wb_possible_flags | \
v6wbi_possible_flags)
#define always_tlb_flags (v3_always_flags & \
v4_always_flags & \
v4wbi_always_flags & \
v4wb_always_flags & \
v6wbi_always_flags)
#define tlb_flag(f) ((always_tlb_flags & (f)) || (__tlb_flag & possible_tlb_flags & (f)))
static inline void local_flush_tlb_all(void)
{
const int zero = 0;
const unsigned int __tlb_flag = __cpu_tlb_flags;
if (tlb_flag(TLB_WB))
asm("mcr%? p15, 0, %0, c7, c10, 4" : : "r" (zero));
if (tlb_flag(TLB_V3_FULL))
asm("mcr%? p15, 0, %0, c6, c0, 0" : : "r" (zero));
if (tlb_flag(TLB_V4_U_FULL | TLB_V6_U_FULL))
asm("mcr%? p15, 0, %0, c8, c7, 0" : : "r" (zero));
if (tlb_flag(TLB_V4_D_FULL | TLB_V6_D_FULL))
asm("mcr%? p15, 0, %0, c8, c6, 0" : : "r" (zero));
if (tlb_flag(TLB_V4_I_FULL | TLB_V6_I_FULL))
asm("mcr%? p15, 0, %0, c8, c5, 0" : : "r" (zero));
}
static inline void local_flush_tlb_mm(struct mm_struct *mm)
{
const int zero = 0;
const int asid = ASID(mm);
const unsigned int __tlb_flag = __cpu_tlb_flags;
if (tlb_flag(TLB_WB))
asm("mcr%? p15, 0, %0, c7, c10, 4" : : "r" (zero));
if (cpu_isset(smp_processor_id(), mm->cpu_vm_mask)) {
if (tlb_flag(TLB_V3_FULL))
asm("mcr%? p15, 0, %0, c6, c0, 0" : : "r" (zero));
if (tlb_flag(TLB_V4_U_FULL))
asm("mcr%? p15, 0, %0, c8, c7, 0" : : "r" (zero));
if (tlb_flag(TLB_V4_D_FULL))
asm("mcr%? p15, 0, %0, c8, c6, 0" : : "r" (zero));
if (tlb_flag(TLB_V4_I_FULL))
asm("mcr%? p15, 0, %0, c8, c5, 0" : : "r" (zero));
}
if (tlb_flag(TLB_V6_U_ASID))
asm("mcr%? p15, 0, %0, c8, c7, 2" : : "r" (asid));
if (tlb_flag(TLB_V6_D_ASID))
asm("mcr%? p15, 0, %0, c8, c6, 2" : : "r" (asid));
if (tlb_flag(TLB_V6_I_ASID))
asm("mcr%? p15, 0, %0, c8, c5, 2" : : "r" (asid));
}
static inline void
local_flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
{
const int zero = 0;
const unsigned int __tlb_flag = __cpu_tlb_flags;
uaddr = (uaddr & PAGE_MASK) | ASID(vma->vm_mm);
if (tlb_flag(TLB_WB))
asm("mcr%? p15, 0, %0, c7, c10, 4" : : "r" (zero));
if (cpu_isset(smp_processor_id(), vma->vm_mm->cpu_vm_mask)) {
if (tlb_flag(TLB_V3_PAGE))
asm("mcr%? p15, 0, %0, c6, c0, 0" : : "r" (uaddr));
if (tlb_flag(TLB_V4_U_PAGE))
asm("mcr%? p15, 0, %0, c8, c7, 1" : : "r" (uaddr));
if (tlb_flag(TLB_V4_D_PAGE))
asm("mcr%? p15, 0, %0, c8, c6, 1" : : "r" (uaddr));
if (tlb_flag(TLB_V4_I_PAGE))
asm("mcr%? p15, 0, %0, c8, c5, 1" : : "r" (uaddr));
if (!tlb_flag(TLB_V4_I_PAGE) && tlb_flag(TLB_V4_I_FULL))
asm("mcr%? p15, 0, %0, c8, c5, 0" : : "r" (zero));
}
if (tlb_flag(TLB_V6_U_PAGE))
asm("mcr%? p15, 0, %0, c8, c7, 1" : : "r" (uaddr));
if (tlb_flag(TLB_V6_D_PAGE))
asm("mcr%? p15, 0, %0, c8, c6, 1" : : "r" (uaddr));
if (tlb_flag(TLB_V6_I_PAGE))
asm("mcr%? p15, 0, %0, c8, c5, 1" : : "r" (uaddr));
}
static inline void local_flush_tlb_kernel_page(unsigned long kaddr)
{
const int zero = 0;
const unsigned int __tlb_flag = __cpu_tlb_flags;
kaddr &= PAGE_MASK;
if (tlb_flag(TLB_WB))
asm("mcr%? p15, 0, %0, c7, c10, 4" : : "r" (zero));
if (tlb_flag(TLB_V3_PAGE))
asm("mcr%? p15, 0, %0, c6, c0, 0" : : "r" (kaddr));
if (tlb_flag(TLB_V4_U_PAGE))
asm("mcr%? p15, 0, %0, c8, c7, 1" : : "r" (kaddr));
if (tlb_flag(TLB_V4_D_PAGE))
asm("mcr%? p15, 0, %0, c8, c6, 1" : : "r" (kaddr));
if (tlb_flag(TLB_V4_I_PAGE))
asm("mcr%? p15, 0, %0, c8, c5, 1" : : "r" (kaddr));
if (!tlb_flag(TLB_V4_I_PAGE) && tlb_flag(TLB_V4_I_FULL))
asm("mcr%? p15, 0, %0, c8, c5, 0" : : "r" (zero));
if (tlb_flag(TLB_V6_U_PAGE))
asm("mcr%? p15, 0, %0, c8, c7, 1" : : "r" (kaddr));
if (tlb_flag(TLB_V6_D_PAGE))
asm("mcr%? p15, 0, %0, c8, c6, 1" : : "r" (kaddr));
if (tlb_flag(TLB_V6_I_PAGE))
asm("mcr%? p15, 0, %0, c8, c5, 1" : : "r" (kaddr));
/* The ARM ARM states that the completion of a TLB maintenance
* operation is only guaranteed by a DSB instruction
*/
if (tlb_flag(TLB_V6_U_PAGE | TLB_V6_D_PAGE | TLB_V6_I_PAGE))
asm("mcr%? p15, 0, %0, c7, c10, 4" : : "r" (zero));
}
/*
* flush_pmd_entry
*
* Flush a PMD entry (word aligned, or double-word aligned) to
* RAM if the TLB for the CPU we are running on requires this.
* This is typically used when we are creating PMD entries.
*
* clean_pmd_entry
*
* Clean (but don't drain the write buffer) if the CPU requires
* these operations. This is typically used when we are removing
* PMD entries.
*/
static inline void flush_pmd_entry(pmd_t *pmd)
{
const unsigned int zero = 0;
const unsigned int __tlb_flag = __cpu_tlb_flags;
if (tlb_flag(TLB_DCLEAN))
asm("mcr%? p15, 0, %0, c7, c10, 1 @ flush_pmd"
: : "r" (pmd));
if (tlb_flag(TLB_WB))
asm("mcr%? p15, 0, %0, c7, c10, 4 @ flush_pmd"
: : "r" (zero));
}
static inline void clean_pmd_entry(pmd_t *pmd)
{
const unsigned int __tlb_flag = __cpu_tlb_flags;
if (tlb_flag(TLB_DCLEAN))
asm("mcr%? p15, 0, %0, c7, c10, 1 @ flush_pmd"
: : "r" (pmd));
}
#undef tlb_flag
#undef always_tlb_flags
#undef possible_tlb_flags
/*
* Convert calls to our calling convention.
*/
#define local_flush_tlb_range(vma,start,end) __cpu_flush_user_tlb_range(start,end,vma)
#define local_flush_tlb_kernel_range(s,e) __cpu_flush_kern_tlb_range(s,e)
#ifndef CONFIG_SMP
#define flush_tlb_all local_flush_tlb_all
#define flush_tlb_mm local_flush_tlb_mm
#define flush_tlb_page local_flush_tlb_page
#define flush_tlb_kernel_page local_flush_tlb_kernel_page
#define flush_tlb_range local_flush_tlb_range
#define flush_tlb_kernel_range local_flush_tlb_kernel_range
#else
extern void flush_tlb_all(void);
extern void flush_tlb_mm(struct mm_struct *mm);
extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr);
extern void flush_tlb_kernel_page(unsigned long kaddr);
extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
#endif
/*
* if PG_dcache_dirty is set for the page, we need to ensure that any
* cache entries for the kernels virtual memory range are written
* back to the page.
*/
extern void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, pte_t pte);
/*
* ARM processors do not cache TLB tables in RAM.
*/
#define flush_tlb_pgtables(mm,start,end) do { } while (0)
#endif
#endif
