2 * arch/sh/mm/tlb-pteaex.c
4 * TLB operations for SH-X3 CPUs featuring PTE ASID Extensions.
6 * Copyright (C) 2009 Paul Mundt
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
12 #include <linux/kernel.h>
15 #include <asm/system.h>
16 #include <asm/mmu_context.h>
17 #include <asm/cacheflush.h>
19 void update_mmu_cache(struct vm_area_struct * vma,
20 unsigned long address, pte_t pte)
26 /* Ptrace may call this routine. */
27 if (vma && current->active_mm != vma->vm_mm)
30 local_irq_save(flags);
32 /* Set PTEH register */
33 vpn = address & MMU_VPN_MASK;
34 __raw_writel(vpn, MMU_PTEH);
37 __raw_writel(get_asid(), MMU_PTEAEX);
41 /* Set PTEA register */
44 * For the extended mode TLB this is trivial, only the ESZ and
45 * EPR bits need to be written out to PTEA, with the remainder of
46 * the protection bits (with the exception of the compat-mode SZ
47 * and PR bits, which are cleared) being written out in PTEL.
49 __raw_writel(pte.pte_high, MMU_PTEA);
52 /* Set PTEL register */
53 pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
54 #ifdef CONFIG_CACHE_WRITETHROUGH
57 /* conveniently, we want all the software flags to be 0 anyway */
58 __raw_writel(pteval, MMU_PTEL);
61 asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
62 local_irq_restore(flags);
66 * While SH-X2 extended TLB mode splits out the memory-mapped I/UTLB
67 * data arrays, SH-X3 cores with PTEAEX split out the memory-mapped
68 * address arrays. In compat mode the second array is inaccessible, while
69 * in extended mode, the legacy 8-bit ASID field in address array 1 has
70 * undefined behaviour.
72 void __uses_jump_to_uncached local_flush_tlb_one(unsigned long asid,
76 __raw_writel(page, MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT);
77 __raw_writel(asid, MMU_UTLB_ADDRESS_ARRAY2 | MMU_PAGE_ASSOC_BIT);