4 * SH-4 specific TLB operations
6 * Copyright (C) 1999 Niibe Yutaka
7 * Copyright (C) 2002 Paul Mundt
9 * Released under the terms of the GNU GPL v2.0.
11 #include <linux/signal.h>
12 #include <linux/sched.h>
13 #include <linux/kernel.h>
14 #include <linux/errno.h>
15 #include <linux/string.h>
16 #include <linux/types.h>
17 #include <linux/ptrace.h>
18 #include <linux/mman.h>
20 #include <linux/smp.h>
21 #include <linux/smp_lock.h>
22 #include <linux/interrupt.h>
24 #include <asm/system.h>
26 #include <asm/uaccess.h>
27 #include <asm/pgalloc.h>
28 #include <asm/hardirq.h>
29 #include <asm/mmu_context.h>
30 #include <asm/cacheflush.h>
32 void update_mmu_cache(struct vm_area_struct * vma,
33 unsigned long address, pte_t pte)
42 /* Ptrace may call this routine. */
43 if (vma && current->active_mm != vma->vm_mm)
48 page = pfn_to_page(pfn);
49 if (!test_bit(PG_mapped, &page->flags)) {
50 unsigned long phys = pte_val(pte) & PTE_PHYS_MASK;
51 __flush_wback_region((void *)P1SEGADDR(phys), PAGE_SIZE);
52 __set_bit(PG_mapped, &page->flags);
56 local_irq_save(flags);
58 /* Set PTEH register */
59 vpn = (address & MMU_VPN_MASK) | get_asid();
60 ctrl_outl(vpn, MMU_PTEH);
62 pteval = pte_val(pte);
63 /* Set PTEA register */
64 /* TODO: make this look less hacky */
65 ptea = ((pteval >> 28) & 0xe) | (pteval & 0x1);
66 ctrl_outl(ptea, MMU_PTEA);
68 /* Set PTEL register */
69 pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
70 #ifdef CONFIG_SH_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 __flush_tlb_page(unsigned long asid, unsigned long page)
83 unsigned long addr, data;
86 * NOTE: PTEH.ASID should be set to this MM
87 * _AND_ we need to write ASID to the array.
89 * It would be simple if we didn't need to set PTEH.ASID...
91 addr = MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT;
92 data = page | asid; /* VALID bit is off */
94 ctrl_outl(data, addr);