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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * arch/sh/mm/tlb-sh3.c
3 *
4 * SH-3 specific TLB operations
5 *
6 * Copyright (C) 1999 Niibe Yutaka
7 * Copyright (C) 2002 Paul Mundt
8 *
9 * Released under the terms of the GNU GPL v2.0.
10 */
Paul Mundt39e688a2007-03-05 19:46:47 +090011#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>
19#include <linux/mm.h>
20#include <linux/smp.h>
21#include <linux/smp_lock.h>
22#include <linux/interrupt.h>
23
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <asm/system.h>
Paul Mundt39e688a2007-03-05 19:46:47 +090025#include <asm/io.h>
26#include <asm/uaccess.h>
27#include <asm/pgalloc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <asm/mmu_context.h>
Paul Mundt39e688a2007-03-05 19:46:47 +090029#include <asm/cacheflush.h>
30
31void update_mmu_cache(struct vm_area_struct * vma,
32 unsigned long address, pte_t pte)
33{
34 unsigned long flags;
35 unsigned long pteval;
36 unsigned long vpn;
37
38 /* Ptrace may call this routine. */
39 if (vma && current->active_mm != vma->vm_mm)
40 return;
41
42#if defined(CONFIG_SH7705_CACHE_32KB)
43 {
44 struct page *page = pte_page(pte);
45 unsigned long pfn = pte_pfn(pte);
46
47 if (pfn_valid(pfn) && !test_bit(PG_mapped, &page->flags)) {
48 unsigned long phys = pte_val(pte) & PTE_PHYS_MASK;
49
50 __flush_wback_region((void *)P1SEGADDR(phys),
51 PAGE_SIZE);
52 __set_bit(PG_mapped, &page->flags);
53 }
54 }
55#endif
56
57 local_irq_save(flags);
58
59 /* Set PTEH register */
60 vpn = (address & MMU_VPN_MASK) | get_asid();
61 ctrl_outl(vpn, MMU_PTEH);
62
63 pteval = pte_val(pte);
64
65 /* Set PTEL register */
66 pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
67 /* conveniently, we want all the software flags to be 0 anyway */
68 ctrl_outl(pteval, MMU_PTEL);
69
70 /* Load the TLB */
71 asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
72 local_irq_restore(flags);
73}
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Paul Mundtea9af692006-12-25 19:28:54 +090075void local_flush_tlb_one(unsigned long asid, unsigned long page)
Linus Torvalds1da177e2005-04-16 15:20:36 -070076{
77 unsigned long addr, data;
78 int i, ways = MMU_NTLB_WAYS;
79
80 /*
81 * NOTE: PTEH.ASID should be set to this MM
82 * _AND_ we need to write ASID to the array.
83 *
84 * It would be simple if we didn't need to set PTEH.ASID...
85 */
86 addr = MMU_TLB_ADDRESS_ARRAY | (page & 0x1F000);
87 data = (page & 0xfffe0000) | asid; /* VALID bit is off */
Paul Mundt0d6d82b2005-11-07 00:58:28 -080088
Paul Mundt11c19652006-12-25 10:19:56 +090089 if ((current_cpu_data.flags & CPU_HAS_MMU_PAGE_ASSOC)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 addr |= MMU_PAGE_ASSOC_BIT;
91 ways = 1; /* we already know the way .. */
92 }
93
94 for (i = 0; i < ways; i++)
95 ctrl_outl(data, addr + (i << 8));
96}
Paul Mundt39e688a2007-03-05 19:46:47 +090097