1 /*
2 * arch/sh/mm/tlb-sh4.c
3 *
4 * SH-4 specific TLB operations
5 *
6 * Copyright (C) 1999 Niibe Yutaka
7 * Copyright (C) 2002 - 2007 Paul Mundt
8 *
9 * Released under the terms of the GNU GPL v2.0.
10 */
11 #include <linux/kernel.h>
12 #include <linux/mm.h>
13 #include <linux/io.h>
14 #include <asm/system.h>
15 #include <asm/mmu_context.h>
16 #include <asm/cacheflush.h>
17
__update_tlb(struct vm_area_struct * vma,unsigned long address,pte_t pte)18 void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
19 {
20 unsigned long flags, pteval, vpn;
21
22 /*
23 * Handle debugger faulting in for debugee.
24 */
25 if (vma && current->active_mm != vma->vm_mm)
26 return;
27
28 local_irq_save(flags);
29
30 /* Set PTEH register */
31 vpn = (address & MMU_VPN_MASK) | get_asid();
32 __raw_writel(vpn, MMU_PTEH);
33
34 pteval = pte.pte_low;
35
36 /* Set PTEA register */
37 #ifdef CONFIG_X2TLB
38 /*
39 * For the extended mode TLB this is trivial, only the ESZ and
40 * EPR bits need to be written out to PTEA, with the remainder of
41 * the protection bits (with the exception of the compat-mode SZ
42 * and PR bits, which are cleared) being written out in PTEL.
43 */
44 __raw_writel(pte.pte_high, MMU_PTEA);
45 #else
46 if (cpu_data->flags & CPU_HAS_PTEA) {
47 /* The last 3 bits and the first one of pteval contains
48 * the PTEA timing control and space attribute bits
49 */
50 __raw_writel(copy_ptea_attributes(pteval), MMU_PTEA);
51 }
52 #endif
53
54 /* Set PTEL register */
55 pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
56 #ifdef CONFIG_CACHE_WRITETHROUGH
57 pteval |= _PAGE_WT;
58 #endif
59 /* conveniently, we want all the software flags to be 0 anyway */
60 __raw_writel(pteval, MMU_PTEL);
61
62 /* Load the TLB */
63 asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
64 local_irq_restore(flags);
65 }
66
local_flush_tlb_one(unsigned long asid,unsigned long page)67 void local_flush_tlb_one(unsigned long asid, unsigned long page)
68 {
69 unsigned long addr, data;
70
71 /*
72 * NOTE: PTEH.ASID should be set to this MM
73 * _AND_ we need to write ASID to the array.
74 *
75 * It would be simple if we didn't need to set PTEH.ASID...
76 */
77 addr = MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT;
78 data = page | asid; /* VALID bit is off */
79 jump_to_uncached();
80 __raw_writel(data, addr);
81 back_to_cached();
82 }
83
local_flush_tlb_all(void)84 void local_flush_tlb_all(void)
85 {
86 unsigned long flags, status;
87 int i;
88
89 /*
90 * Flush all the TLB.
91 */
92 local_irq_save(flags);
93 jump_to_uncached();
94
95 status = __raw_readl(MMUCR);
96 status = ((status & MMUCR_URB) >> MMUCR_URB_SHIFT);
97
98 if (status == 0)
99 status = MMUCR_URB_NENTRIES;
100
101 for (i = 0; i < status; i++)
102 __raw_writel(0x0, MMU_UTLB_ADDRESS_ARRAY | (i << 8));
103
104 for (i = 0; i < 4; i++)
105 __raw_writel(0x0, MMU_ITLB_ADDRESS_ARRAY | (i << 8));
106
107 back_to_cached();
108 ctrl_barrier();
109 local_irq_restore(flags);
110 }
111