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      1 /*-
      2  * Copyright (c) 2021 The NetBSD Foundation, Inc.
      3  * All rights reserved.
      4  *
      5  * This code is derived from software contributed to The NetBSD Foundation
      6  * by Nick Hudson
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     18  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     19  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     20  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     27  * POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include "opt_cputypes.h"
     31 #include "opt_multiprocessor.h"
     32 
     33 #include <sys/cdefs.h>
     34 __KERNEL_RCSID(1, "$NetBSD: aarch64_tlb.c,v 1.3 2026/04/19 15:09:49 skrll Exp $");
     35 
     36 #include <sys/param.h>
     37 #include <sys/types.h>
     38 
     39 #include <uvm/uvm.h>
     40 
     41 #include <arm/cpufunc.h>
     42 
     43 #include <aarch64/armreg.h>
     44 
     45 tlb_asid_t
     46 tlb_get_asid(void)
     47 {
     48 
     49 	return (reg_tcr_el1_read() & TCR_EPD0) != 0 ?
     50 	    KERNEL_PID :__SHIFTOUT(reg_ttbr0_el1_read(), TTBR_ASID);
     51 }
     52 
     53 #if 0
     54 void
     55 tlb_set_asid(tlb_asid_t asid, pmap_t pm)
     56 {
     57 	const uint64_t ttbr =
     58 	    __SHIFTIN(asid, TTBR_ASID) |
     59 	    __SHIFTIN(pmap_l0pa(pm), TTBR_BADDR);
     60 
     61 	cpu_set_ttbr0(ttbr);
     62 }
     63 #endif
     64 
     65 void
     66 tlb_invalidate_all(void)
     67 {
     68 
     69 	aarch64_tlbi_all();
     70 }
     71 
     72 void
     73 tlb_invalidate_globals(void)
     74 {
     75 	tlb_invalidate_all();
     76 }
     77 
     78 void
     79 tlb_invalidate_asids(tlb_asid_t lo, tlb_asid_t hi)
     80 {
     81 	for (; lo <= hi; lo++) {
     82 		aarch64_tlbi_by_asid(lo);
     83 	}
     84 }
     85 
     86 void
     87 tlb_invalidate_addr(vaddr_t va, tlb_asid_t asid)
     88 {
     89 	KASSERT((va & PAGE_MASK) == 0);
     90 
     91 	aarch64_tlbi_by_asid_va(asid, va);
     92 }
     93 
     94 bool
     95 tlb_update_addr(vaddr_t va, tlb_asid_t asid, pt_entry_t pte, bool insert_p)
     96 {
     97 	KASSERT((va & PAGE_MASK) == 0);
     98 
     99 	tlb_invalidate_addr(va, asid);
    100 
    101 	return true;
    102 }
    103 
    104 u_int
    105 tlb_record_asids(u_long *mapp, tlb_asid_t asid_max)
    106 {
    107 	KASSERT(asid_max == pmap_md_tlb_asid_max());
    108 
    109 #if DIAGNOSTIC
    110 	memset(mapp, 0xff, (asid_max + 1) / NBBY);
    111 	mapp[0] ^= __BITS(0, KERNEL_PID);
    112 #endif
    113 	return asid_max;
    114 }
    115 
    116 void
    117 tlb_walk(void *ctx, bool (*func)(void *, vaddr_t, tlb_asid_t, pt_entry_t))
    118 {
    119 
    120 	/* no way to view the TLB */
    121 }
    122