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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
18void __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 */
70void 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
80void 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}
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/system.h>
16#include <asm/mmu_context.h>
17#include <asm/cacheflush.h>
18
19void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
20{
21 unsigned long flags, pteval, vpn;
22
23 /*
24 * Handle debugger faulting in for debugee.
25 */
26 if (vma && current->active_mm != vma->vm_mm)
27 return;
28
29 local_irq_save(flags);
30
31 /* Set PTEH register */
32 vpn = address & MMU_VPN_MASK;
33 __raw_writel(vpn, MMU_PTEH);
34
35 /* Set PTEAEX */
36 __raw_writel(get_asid(), MMU_PTEAEX);
37
38 pteval = pte.pte_low;
39
40 /* Set PTEA register */
41#ifdef CONFIG_X2TLB
42 /*
43 * For the extended mode TLB this is trivial, only the ESZ and
44 * EPR bits need to be written out to PTEA, with the remainder of
45 * the protection bits (with the exception of the compat-mode SZ
46 * and PR bits, which are cleared) being written out in PTEL.
47 */
48 __raw_writel(pte.pte_high, MMU_PTEA);
49#endif
50
51 /* Set PTEL register */
52 pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
53#ifdef CONFIG_CACHE_WRITETHROUGH
54 pteval |= _PAGE_WT;
55#endif
56 /* conveniently, we want all the software flags to be 0 anyway */
57 __raw_writel(pteval, MMU_PTEL);
58
59 /* Load the TLB */
60 asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
61 local_irq_restore(flags);
62}
63
64/*
65 * While SH-X2 extended TLB mode splits out the memory-mapped I/UTLB
66 * data arrays, SH-X3 cores with PTEAEX split out the memory-mapped
67 * address arrays. In compat mode the second array is inaccessible, while
68 * in extended mode, the legacy 8-bit ASID field in address array 1 has
69 * undefined behaviour.
70 */
71void local_flush_tlb_one(unsigned long asid, unsigned long page)
72{
73 jump_to_uncached();
74 __raw_writel(page, MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT);
75 __raw_writel(asid, MMU_UTLB_ADDRESS_ARRAY2 | MMU_PAGE_ASSOC_BIT);
76 __raw_writel(page, MMU_ITLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT);
77 __raw_writel(asid, MMU_ITLB_ADDRESS_ARRAY2 | MMU_PAGE_ASSOC_BIT);
78 back_to_cached();
79}
80
81void local_flush_tlb_all(void)
82{
83 unsigned long flags, status;
84 int i;
85
86 /*
87 * Flush all the TLB.
88 */
89 local_irq_save(flags);
90 jump_to_uncached();
91
92 status = __raw_readl(MMUCR);
93 status = ((status & MMUCR_URB) >> MMUCR_URB_SHIFT);
94
95 if (status == 0)
96 status = MMUCR_URB_NENTRIES;
97
98 for (i = 0; i < status; i++)
99 __raw_writel(0x0, MMU_UTLB_ADDRESS_ARRAY | (i << 8));
100
101 for (i = 0; i < 4; i++)
102 __raw_writel(0x0, MMU_ITLB_ADDRESS_ARRAY | (i << 8));
103
104 back_to_cached();
105 ctrl_barrier();
106 local_irq_restore(flags);
107}