1 // SPDX-License-Identifier: GPL-2.0-only
5 * SH-4 specific TLB operations
7 * Copyright (C) 1999 Niibe Yutaka
8 * Copyright (C) 2002 - 2007 Paul Mundt
10 #include <linux/kernel.h>
13 #include <asm/mmu_context.h>
14 #include <asm/cacheflush.h>
16 void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
18 unsigned long flags, pteval, vpn;
21 * Handle debugger faulting in for debugee.
23 if (vma && current->active_mm != vma->vm_mm)
26 local_irq_save(flags);
28 /* Set PTEH register */
29 vpn = (address & MMU_VPN_MASK) | get_asid();
30 __raw_writel(vpn, MMU_PTEH);
34 /* Set PTEA register */
37 * For the extended mode TLB this is trivial, only the ESZ and
38 * EPR bits need to be written out to PTEA, with the remainder of
39 * the protection bits (with the exception of the compat-mode SZ
40 * and PR bits, which are cleared) being written out in PTEL.
42 __raw_writel(pte.pte_high, MMU_PTEA);
44 if (cpu_data->flags & CPU_HAS_PTEA) {
45 /* The last 3 bits and the first one of pteval contains
46 * the PTEA timing control and space attribute bits
48 __raw_writel(copy_ptea_attributes(pteval), MMU_PTEA);
52 /* Set PTEL register */
53 pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
54 #ifdef CONFIG_CACHE_WRITETHROUGH
57 /* conveniently, we want all the software flags to be 0 anyway */
58 __raw_writel(pteval, MMU_PTEL);
61 asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
62 local_irq_restore(flags);
65 void local_flush_tlb_one(unsigned long asid, unsigned long page)
67 unsigned long addr, data;
70 * NOTE: PTEH.ASID should be set to this MM
71 * _AND_ we need to write ASID to the array.
73 * It would be simple if we didn't need to set PTEH.ASID...
75 addr = MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT;
76 data = page | asid; /* VALID bit is off */
78 __raw_writel(data, addr);
82 void local_flush_tlb_all(void)
84 unsigned long flags, status;
90 local_irq_save(flags);
93 status = __raw_readl(MMUCR);
94 status = ((status & MMUCR_URB) >> MMUCR_URB_SHIFT);
97 status = MMUCR_URB_NENTRIES;
99 for (i = 0; i < status; i++)
100 __raw_writel(0x0, MMU_UTLB_ADDRESS_ARRAY | (i << 8));
102 for (i = 0; i < 4; i++)
103 __raw_writel(0x0, MMU_ITLB_ADDRESS_ARRAY | (i << 8));
107 local_irq_restore(flags);