1 /*
2 * arch/sh/mm/tlb-pteaex.c
3 *
4 * TLB operations for SH-X3 CPUs featuring PTE ASID Extensions.
5 *
6 * Copyright (C) 2009 Paul Mundt
7 *
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
10 * for more details.
11 */
12 #include <linux/kernel.h>
13 #include <linux/mm.h>
14 #include <linux/io.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;
32 __raw_writel(vpn, MMU_PTEH);
33
34 /* Set PTEAEX */
35 __raw_writel(get_asid(), MMU_PTEAEX);
36
37 pteval = pte.pte_low;
38
39 /* Set PTEA register */
40 #ifdef CONFIG_X2TLB
41 /*
42 * For the extended mode TLB this is trivial, only the ESZ and
43 * EPR bits need to be written out to PTEA, with the remainder of
44 * the protection bits (with the exception of the compat-mode SZ
45 * and PR bits, which are cleared) being written out in PTEL.
46 */
47 __raw_writel(pte.pte_high, MMU_PTEA);
48 #endif
49
50 /* Set PTEL register */
51 pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
52 #ifdef CONFIG_CACHE_WRITETHROUGH
53 pteval |= _PAGE_WT;
54 #endif
55 /* conveniently, we want all the software flags to be 0 anyway */
56 __raw_writel(pteval, MMU_PTEL);
57
58 /* Load the TLB */
59 asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
60 local_irq_restore(flags);
61 }
62
63 /*
64 * While SH-X2 extended TLB mode splits out the memory-mapped I/UTLB
65 * data arrays, SH-X3 cores with PTEAEX split out the memory-mapped
66 * address arrays. In compat mode the second array is inaccessible, while
67 * in extended mode, the legacy 8-bit ASID field in address array 1 has
68 * undefined behaviour.
69 */
local_flush_tlb_one(unsigned long asid,unsigned long page)70 void local_flush_tlb_one(unsigned long asid, unsigned long page)
71 {
72 jump_to_uncached();
73 __raw_writel(page, MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT);
74 __raw_writel(asid, MMU_UTLB_ADDRESS_ARRAY2 | MMU_PAGE_ASSOC_BIT);
75 __raw_writel(page, MMU_ITLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT);
76 __raw_writel(asid, MMU_ITLB_ADDRESS_ARRAY2 | MMU_PAGE_ASSOC_BIT);
77 back_to_cached();
78 }
79
local_flush_tlb_all(void)80 void local_flush_tlb_all(void)
81 {
82 unsigned long flags, status;
83 int i;
84
85 /*
86 * Flush all the TLB.
87 */
88 local_irq_save(flags);
89 jump_to_uncached();
90
91 status = __raw_readl(MMUCR);
92 status = ((status & MMUCR_URB) >> MMUCR_URB_SHIFT);
93
94 if (status == 0)
95 status = MMUCR_URB_NENTRIES;
96
97 for (i = 0; i < status; i++)
98 __raw_writel(0x0, MMU_UTLB_ADDRESS_ARRAY | (i << 8));
99
100 for (i = 0; i < 4; i++)
101 __raw_writel(0x0, MMU_ITLB_ADDRESS_ARRAY | (i << 8));
102
103 back_to_cached();
104 ctrl_barrier();
105 local_irq_restore(flags);
106 }
107