97 строки
2.2 KiB
C
97 строки
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* arch/sh/mm/tlb-sh3.c
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*
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* SH-3 specific TLB operations
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*
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* Copyright (C) 1999 Niibe Yutaka
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* Copyright (C) 2002 Paul Mundt
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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
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#include <linux/uaccess.h>
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#include <asm/pgalloc.h>
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#include <asm/mmu_context.h>
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#include <asm/cacheflush.h>
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void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
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{
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unsigned long flags, pteval, vpn;
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/*
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* Handle debugger faulting in for debugee.
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*/
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if (vma && current->active_mm != vma->vm_mm)
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return;
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local_irq_save(flags);
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/* Set PTEH register */
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vpn = (address & MMU_VPN_MASK) | get_asid();
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__raw_writel(vpn, MMU_PTEH);
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pteval = pte_val(pte);
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/* Set PTEL register */
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pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
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/* conveniently, we want all the software flags to be 0 anyway */
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__raw_writel(pteval, MMU_PTEL);
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/* Load the TLB */
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asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
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local_irq_restore(flags);
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}
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void local_flush_tlb_one(unsigned long asid, unsigned long page)
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{
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unsigned long addr, data;
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int i, ways = MMU_NTLB_WAYS;
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/*
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* NOTE: PTEH.ASID should be set to this MM
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* _AND_ we need to write ASID to the array.
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*
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* It would be simple if we didn't need to set PTEH.ASID...
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*/
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addr = MMU_TLB_ADDRESS_ARRAY | (page & 0x1F000);
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data = (page & 0xfffe0000) | asid; /* VALID bit is off */
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if ((current_cpu_data.flags & CPU_HAS_MMU_PAGE_ASSOC)) {
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addr |= MMU_PAGE_ASSOC_BIT;
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ways = 1; /* we already know the way .. */
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}
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for (i = 0; i < ways; i++)
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__raw_writel(data, addr + (i << 8));
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}
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void local_flush_tlb_all(void)
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{
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unsigned long flags, status;
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/*
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* Flush all the TLB.
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*
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* Write to the MMU control register's bit:
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* TF-bit for SH-3, TI-bit for SH-4.
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* It's same position, bit #2.
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*/
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local_irq_save(flags);
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status = __raw_readl(MMUCR);
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status |= 0x04;
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__raw_writel(status, MMUCR);
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ctrl_barrier();
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local_irq_restore(flags);
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}
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