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/*
* linux/arch/unicore32/include/asm/tlbflush.h
*
* Code specific to PKUnity SoC and UniCore ISA
*
* Copyright (C) 2001-2010 GUAN Xue-tao
*
* 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 __UNICORE_TLBFLUSH_H__
#define __UNICORE_TLBFLUSH_H__
#ifndef __ASSEMBLY__
#include <linux/sched.h>
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);
/*
* TLB Management
* ==============
*
* The arch/unicore/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
*/
static inline void local_flush_tlb_all(void)
{
const int zero = 0;
/* TLB invalidate all */
asm("movc p0.c6, %0, #6; nop; nop; nop; nop; nop; nop; nop; nop"
: : "r" (zero) : "cc");
}
static inline void local_flush_tlb_mm(struct mm_struct *mm)
{
const int zero = 0;
if (cpumask_test_cpu(get_cpu(), mm_cpumask(mm))) {
/* TLB invalidate all */
asm("movc p0.c6, %0, #6; nop; nop; nop; nop; nop; nop; nop; nop"
: : "r" (zero) : "cc");
}
put_cpu();
}
static inline void
local_flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr)
{
if (cpumask_test_cpu(smp_processor_id(), mm_cpumask(vma->vm_mm))) {
#ifndef CONFIG_CPU_TLB_SINGLE_ENTRY_DISABLE
/* iTLB invalidate page */
asm("movc p0.c6, %0, #5; nop; nop; nop; nop; nop; nop; nop; nop"
: : "r" (uaddr & PAGE_MASK) : "cc");
/* dTLB invalidate page */
asm("movc p0.c6, %0, #3; nop; nop; nop; nop; nop; nop; nop; nop"
: : "r" (uaddr & PAGE_MASK) : "cc");
#else
/* TLB invalidate all */
asm("movc p0.c6, %0, #6; nop; nop; nop; nop; nop; nop; nop; nop"
: : "r" (uaddr & PAGE_MASK) : "cc");
#endif
}
}
static inline void local_flush_tlb_kernel_page(unsigned long kaddr)
{
#ifndef CONFIG_CPU_TLB_SINGLE_ENTRY_DISABLE
/* iTLB invalidate page */
asm("movc p0.c6, %0, #5; nop; nop; nop; nop; nop; nop; nop; nop"
: : "r" (kaddr & PAGE_MASK) : "cc");
/* dTLB invalidate page */
asm("movc p0.c6, %0, #3; nop; nop; nop; nop; nop; nop; nop; nop"
: : "r" (kaddr & PAGE_MASK) : "cc");
#else
/* TLB invalidate all */
asm("movc p0.c6, %0, #6; nop; nop; nop; nop; nop; nop; nop; nop"
: : "r" (kaddr & PAGE_MASK) : "cc");
#endif
}
/*
* 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)
{
#ifndef CONFIG_CPU_DCACHE_LINE_DISABLE
/* flush dcache line, see dcacheline_flush in proc-macros.S */
asm("mov r1, %0 << #20\n"
"ldw r2, =_stext\n"
"add r2, r2, r1 >> #20\n"
"ldw r1, [r2+], #0x0000\n"
"ldw r1, [r2+], #0x1000\n"
"ldw r1, [r2+], #0x2000\n"
"ldw r1, [r2+], #0x3000\n"
: : "r" (pmd) : "r1", "r2");
#else
/* flush dcache all */
asm("movc p0.c5, %0, #14; nop; nop; nop; nop; nop; nop; nop; nop"
: : "r" (pmd) : "cc");
#endif
}
static inline void clean_pmd_entry(pmd_t *pmd)
{
#ifndef CONFIG_CPU_DCACHE_LINE_DISABLE
/* clean dcache line */
asm("movc p0.c5, %0, #11; nop; nop; nop; nop; nop; nop; nop; nop"
: : "r" (__pa(pmd) & ~(L1_CACHE_BYTES - 1)) : "cc");
#else
/* clean dcache all */
asm("movc p0.c5, %0, #10; nop; nop; nop; nop; nop; nop; nop; nop"
: : "r" (pmd) : "cc");
#endif
}
/*
* 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)
#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
/*
* if PG_dcache_clean is not 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 *ptep);
extern void do_bad_area(unsigned long addr, unsigned int fsr,
struct pt_regs *regs);
#endif
#endif
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