3c726f8dee
Adds a new CONFIG_PPC_64K_PAGES which, when enabled, changes the kernel base page size to 64K. The resulting kernel still boots on any hardware. On current machines with 4K pages support only, the kernel will maintain 16 "subpages" for each 64K page transparently. Note that while real 64K capable HW has been tested, the current patch will not enable it yet as such hardware is not released yet, and I'm still verifying with the firmware architects the proper to get the information from the newer hypervisors. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
148 lines
4 KiB
C
148 lines
4 KiB
C
#ifndef _ASM_POWERPC_TLBFLUSH_H
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#define _ASM_POWERPC_TLBFLUSH_H
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/*
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* TLB flushing:
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*
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* - flush_tlb_mm(mm) flushes the specified mm context TLB's
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* - flush_tlb_page(vma, vmaddr) flushes one page
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* - flush_tlb_page_nohash(vma, vmaddr) flushes one page if SW loaded TLB
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* - flush_tlb_range(vma, start, end) flushes a range of pages
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* - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
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* - flush_tlb_pgtables(mm, start, end) flushes a range of page tables
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifdef __KERNEL__
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#include <linux/config.h>
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struct mm_struct;
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#ifdef CONFIG_PPC64
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#include <linux/percpu.h>
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#include <asm/page.h>
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#define PPC64_TLB_BATCH_NR 192
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struct ppc64_tlb_batch {
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unsigned long index;
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struct mm_struct *mm;
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real_pte_t pte[PPC64_TLB_BATCH_NR];
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unsigned long vaddr[PPC64_TLB_BATCH_NR];
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unsigned int psize;
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};
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DECLARE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch);
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extern void __flush_tlb_pending(struct ppc64_tlb_batch *batch);
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static inline void flush_tlb_pending(void)
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{
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struct ppc64_tlb_batch *batch = &get_cpu_var(ppc64_tlb_batch);
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if (batch->index)
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__flush_tlb_pending(batch);
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put_cpu_var(ppc64_tlb_batch);
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}
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extern void flush_hash_page(unsigned long va, real_pte_t pte, int psize,
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int local);
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extern void flush_hash_range(unsigned long number, int local);
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#else /* CONFIG_PPC64 */
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#include <linux/mm.h>
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extern void _tlbie(unsigned long address);
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extern void _tlbia(void);
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/*
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* TODO: (CONFIG_FSL_BOOKE) determine if flush_tlb_range &
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* flush_tlb_kernel_range are best implemented as tlbia vs
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* specific tlbie's
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*/
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#if (defined(CONFIG_4xx) && !defined(CONFIG_44x)) || defined(CONFIG_8xx)
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#define flush_tlb_pending() asm volatile ("tlbia; sync" : : : "memory")
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#elif defined(CONFIG_4xx) || defined(CONFIG_FSL_BOOKE)
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#define flush_tlb_pending() _tlbia()
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#endif
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/*
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* This gets called at the end of handling a page fault, when
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* the kernel has put a new PTE into the page table for the process.
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* We use it to ensure coherency between the i-cache and d-cache
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* for the page which has just been mapped in.
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* On machines which use an MMU hash table, we use this to put a
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* corresponding HPTE into the hash table ahead of time, instead of
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* waiting for the inevitable extra hash-table miss exception.
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*/
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extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);
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#endif /* CONFIG_PPC64 */
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#if defined(CONFIG_PPC64) || defined(CONFIG_4xx) || \
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defined(CONFIG_FSL_BOOKE) || defined(CONFIG_8xx)
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static inline void flush_tlb_mm(struct mm_struct *mm)
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{
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flush_tlb_pending();
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}
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static inline void flush_tlb_page(struct vm_area_struct *vma,
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unsigned long vmaddr)
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{
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#ifdef CONFIG_PPC64
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flush_tlb_pending();
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#else
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_tlbie(vmaddr);
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#endif
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}
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static inline void flush_tlb_page_nohash(struct vm_area_struct *vma,
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unsigned long vmaddr)
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{
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#ifndef CONFIG_PPC64
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_tlbie(vmaddr);
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#endif
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}
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static inline void flush_tlb_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end)
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{
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flush_tlb_pending();
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}
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static inline void flush_tlb_kernel_range(unsigned long start,
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unsigned long end)
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{
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flush_tlb_pending();
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}
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#else /* 6xx, 7xx, 7xxx cpus */
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extern void flush_tlb_mm(struct mm_struct *mm);
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extern void flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
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extern void flush_tlb_page_nohash(struct vm_area_struct *vma, unsigned long addr);
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extern void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end);
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extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
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#endif
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/*
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* This is called in munmap when we have freed up some page-table
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* pages. We don't need to do anything here, there's nothing special
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* about our page-table pages. -- paulus
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*/
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static inline void flush_tlb_pgtables(struct mm_struct *mm,
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unsigned long start, unsigned long end)
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{
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}
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#endif /*__KERNEL__ */
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#endif /* _ASM_POWERPC_TLBFLUSH_H */
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