4 * SH-4 specific TLB operations
6 * Copyright (C) 1999 Niibe Yutaka
7 * Copyright (C) 2002 - 2007 Paul Mundt
9 * Released under the terms of the GNU GPL v2.0.
11 #include <linux/kernel.h>
14 #include <asm/system.h>
15 #include <asm/mmu_context.h>
16 #include <asm/cacheflush.h>
18 void update_mmu_cache(struct vm_area_struct * vma,
19 unsigned long address, pte_t pte)
24 unsigned long pfn = pte_pfn(pte);
27 /* Ptrace may call this routine. */
28 if (vma && current->active_mm != vma->vm_mm)
31 page = pfn_to_page(pfn);
32 if (pfn_valid(pfn) && page_mapping(page)) {
34 int dirty = test_and_clear_bit(PG_dcache_dirty, &page->flags);
37 unsigned long addr = (unsigned long)page_address(page);
39 if (pages_do_alias(addr, address & PAGE_MASK))
40 __flush_wback_region((void *)addr, PAGE_SIZE);
45 local_irq_save(flags);
47 /* Set PTEH register */
48 vpn = (address & MMU_VPN_MASK) | get_asid();
49 ctrl_outl(vpn, MMU_PTEH);
53 /* Set PTEA register */
56 * For the extended mode TLB this is trivial, only the ESZ and
57 * EPR bits need to be written out to PTEA, with the remainder of
58 * the protection bits (with the exception of the compat-mode SZ
59 * and PR bits, which are cleared) being written out in PTEL.
61 ctrl_outl(pte.pte_high, MMU_PTEA);
63 if (cpu_data->flags & CPU_HAS_PTEA)
64 /* TODO: make this look less hacky */
65 ctrl_outl(((pteval >> 28) & 0xe) | (pteval & 0x1), MMU_PTEA);
68 /* Set PTEL register */
69 pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
70 #ifdef CONFIG_CACHE_WRITETHROUGH
73 /* conveniently, we want all the software flags to be 0 anyway */
74 ctrl_outl(pteval, MMU_PTEL);
77 asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
78 local_irq_restore(flags);
81 void __uses_jump_to_uncached local_flush_tlb_one(unsigned long asid,
84 unsigned long addr, data;
87 * NOTE: PTEH.ASID should be set to this MM
88 * _AND_ we need to write ASID to the array.
90 * It would be simple if we didn't need to set PTEH.ASID...
92 addr = MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT;
93 data = page | asid; /* VALID bit is off */
95 ctrl_outl(data, addr);