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pmap.h revision 1.16 
      1 /* $NetBSD: pmap.h,v 1.16 2023/05/08 07:56:08 skrll Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2014, 2019, 2021 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Matt Thomas (of 3am Software Foundry), Maxime Villard, and
      9  * Nick Hudson.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     30  * POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #ifndef _RISCV_PMAP_H_
     34 #define	_RISCV_PMAP_H_
     35 
     36 #ifdef _KERNEL_OPT
     37 #include "opt_modular.h"
     38 #endif
     39 
     40 #if !defined(_MODULE)
     41 
     42 #include <sys/cdefs.h>
     43 #include <sys/types.h>
     44 #include <sys/pool.h>
     45 #include <sys/evcnt.h>
     46 
     47 #include <uvm/uvm_physseg.h>
     48 #include <uvm/pmap/vmpagemd.h>
     49 
     50 #include <riscv/pte.h>
     51 #include <riscv/sysreg.h>
     52 
     53 #define	PMAP_SEGTABSIZE	NPTEPG
     54 #define	PMAP_PDETABSIZE	NPTEPG
     55 
     56 #ifdef _LP64
     57 #define	PTPSHIFT	3
     58 /* This is SV57. */
     59 //#define	XSEGSHIFT	(SEGSHIFT + SEGLENGTH + SEGLENGTH + SEGLENGTH)
     60 
     61 /* This is SV48. */
     62 //#define	XSEGSHIFT	(SEGSHIFT + SEGLENGTH + SEGLENGTH)
     63 
     64 /* This is SV39. */
     65 #define	XSEGSHIFT	(SEGSHIFT + SEGLENGTH)
     66 #define	NBXSEG		(1ULL << XSEGSHIFT)
     67 #define	XSEGOFSET	(NBXSEG - 1)		/* byte offset into xsegment */
     68 #define	XSEGLENGTH	(PGSHIFT - 3)
     69 #define	NXSEGPG		(1 << XSEGLENGTH)
     70 #else
     71 #define	PTPSHIFT	2
     72 #define	XSEGSHIFT	SEGSHIFT
     73 #endif
     74 
     75 #define	SEGLENGTH	(PGSHIFT - PTPSHIFT)
     76 #define	SEGSHIFT	(SEGLENGTH + PGSHIFT)
     77 #define	NBSEG		(1 << SEGSHIFT)		/* bytes/segment */
     78 #define	SEGOFSET	(NBSEG - 1)		/* byte offset into segment */
     79 
     80 #define	KERNEL_PID	0
     81 
     82 #define	PMAP_HWPAGEWALKER		1
     83 #define	PMAP_TLB_MAX			1
     84 #ifdef _LP64
     85 #define	PMAP_INVALID_PDETAB_ADDRESS	((pmap_pdetab_t *)(VM_MIN_KERNEL_ADDRESS - PAGE_SIZE))
     86 #define	PMAP_INVALID_SEGTAB_ADDRESS	((pmap_segtab_t *)(VM_MIN_KERNEL_ADDRESS - PAGE_SIZE))
     87 #else
     88 #define	PMAP_INVALID_PDETAB_ADDRESS	((pmap_pdetab_t *)0xdeadbeef)
     89 #define	PMAP_INVALID_SEGTAB_ADDRESS	((pmap_segtab_t *)0xdeadbeef)
     90 #endif
     91 #define	PMAP_TLB_NUM_PIDS		(__SHIFTOUT_MASK(SATP_ASID) + 1)
     92 #define	PMAP_TLB_BITMAP_LENGTH          PMAP_TLB_NUM_PIDS
     93 #define	PMAP_TLB_FLUSH_ASID_ON_RESET	false
     94 
     95 #define	pmap_phys_address(x)		(x)
     96 
     97 #ifndef __BSD_PTENTRY_T__
     98 #define	__BSD_PTENTRY_T__
     99 #ifdef _LP64
    100 #define	PRIxPTE         PRIx64
    101 #else
    102 #define	PRIxPTE         PRIx32
    103 #endif
    104 #endif /* __BSD_PTENTRY_T__ */
    105 
    106 #define	PMAP_NEED_PROCWR
    107 static inline void
    108 pmap_procwr(struct proc *p, vaddr_t va, vsize_t len)
    109 {
    110 	__asm __volatile("fence\trw,rw; fence.i" ::: "memory");
    111 }
    112 
    113 #include <uvm/pmap/tlb.h>
    114 #include <uvm/pmap/pmap_devmap.h>
    115 #include <uvm/pmap/pmap_tlb.h>
    116 
    117 #define	PMAP_GROWKERNEL
    118 #define	PMAP_STEAL_MEMORY
    119 
    120 #ifdef _KERNEL
    121 
    122 #define	__HAVE_PMAP_MD
    123 struct pmap_md {
    124 	paddr_t md_ppn;
    125 };
    126 
    127 struct vm_page *
    128 	pmap_md_alloc_poolpage(int flags);
    129 vaddr_t	pmap_md_map_poolpage(paddr_t, vsize_t);
    130 void	pmap_md_unmap_poolpage(vaddr_t, vsize_t);
    131 bool	pmap_md_direct_mapped_vaddr_p(vaddr_t);
    132 bool	pmap_md_io_vaddr_p(vaddr_t);
    133 paddr_t	pmap_md_direct_mapped_vaddr_to_paddr(vaddr_t);
    134 vaddr_t	pmap_md_direct_map_paddr(paddr_t);
    135 void	pmap_md_init(void);
    136 
    137 void	pmap_md_xtab_activate(struct pmap *, struct lwp *);
    138 void	pmap_md_xtab_deactivate(struct pmap *);
    139 void	pmap_md_pdetab_init(struct pmap *);
    140 void	pmap_md_pdetab_fini(struct pmap *);
    141 bool	pmap_md_ok_to_steal_p(const uvm_physseg_t, size_t);
    142 
    143 void	pmap_bootstrap(vaddr_t, vaddr_t);
    144 
    145 vsize_t	pmap_kenter_range(vaddr_t, paddr_t, vsize_t, vm_prot_t, u_int);
    146 
    147 #ifdef _LP64
    148 extern vaddr_t pmap_direct_base;
    149 extern vaddr_t pmap_direct_end;
    150 #if 0	/* XXXSB is pmap_direct_base not initialised correctly somehow?  didn't check */
    151 #define	PMAP_DIRECT_MAP(pa)	(pmap_direct_base + (pa))
    152 #define	PMAP_DIRECT_UNMAP(va)	((paddr_t)(va) - pmap_direct_base)
    153 #else
    154 #define	PMAP_DIRECT_MAP(pa)	RISCV_PA_TO_KVA(pa)
    155 #define	PMAP_DIRECT_UNMAP(va)	RISCV_KVA_TO_PA(va)
    156 
    157 #endif
    158 
    159 /*
    160  * Other hooks for the pool allocator.
    161  */
    162 #define	POOL_PHYSTOV(pa)	RISCV_PA_TO_KVA((paddr_t)(pa))
    163 #define	POOL_VTOPHYS(va)	RISCV_KVA_TO_PA((vaddr_t)(va))
    164 
    165 #endif	/* _LP64 */
    166 
    167 #define	MEGAPAGE_TRUNC(x)	((x) & ~SEGOFSET)
    168 #define	MEGAPAGE_ROUND(x)	MEGAPAGE_TRUNC((x) + SEGOFSET)
    169 
    170 #define	PMAP_DEV		__BIT(29)	/* 0x2000_0000 */
    171 
    172 #define	DEVMAP_ALIGN(x)		MEGAPAGE_TRUNC((x))
    173 #define	DEVMAP_SIZE(x)		MEGAPAGE_ROUND((x))
    174 #define	DEVMAP_FLAGS		PMAP_DEV
    175 
    176 #ifdef __PMAP_PRIVATE
    177 
    178 static inline bool
    179 pmap_md_tlb_check_entry(void *ctx, vaddr_t va, tlb_asid_t asid, pt_entry_t pte)
    180 {
    181         // TLB not walked and so not called.
    182         return false;
    183 }
    184 
    185 static inline void
    186 pmap_md_page_syncicache(struct vm_page_md *mdpg, const kcpuset_t *kc)
    187 {
    188 	__asm __volatile("fence\trw,rw; fence.i" ::: "memory");
    189 }
    190 
    191 /*
    192  * Virtual Cache Alias helper routines.  Not a problem for RISCV CPUs.
    193  */
    194 static inline bool
    195 pmap_md_vca_add(struct vm_page_md *mdpg, vaddr_t va, pt_entry_t *nptep)
    196 {
    197 	return false;
    198 }
    199 
    200 static inline void
    201 pmap_md_vca_remove(struct vm_page_md *mdpg, vaddr_t va)
    202 {
    203 }
    204 
    205 static inline void
    206 pmap_md_vca_clean(struct vm_page_md *mdpg, vaddr_t va, int op)
    207 {
    208 }
    209 
    210 static inline size_t
    211 pmap_md_tlb_asid_max(void)
    212 {
    213 	return PMAP_TLB_NUM_PIDS - 1;
    214 }
    215 
    216 static inline pt_entry_t *
    217 pmap_md_nptep(pt_entry_t *ptep)
    218 {
    219 	return ptep + 1;
    220 }
    221 
    222 static inline bool
    223 pmap_md_kernel_vaddr_p(vaddr_t va)
    224 {
    225 	return false;
    226 }
    227 
    228 static inline paddr_t
    229 pmap_md_kernel_vaddr_to_paddr(vaddr_t vax)
    230 {
    231 	/* Not used due to false from pmap_md_kernel_vaddr_p */
    232 
    233 	return 0;
    234 }
    235 
    236 #endif /* __PMAP_PRIVATE */
    237 #endif /* _KERNEL */
    238 
    239 #include <uvm/pmap/pmap.h>
    240 
    241 #endif /* !_MODULE */
    242 
    243 #if defined(MODULAR) || defined(_MODULE)
    244 /*
    245  * Define a compatible vm_page_md so that struct vm_page is the same size
    246  * whether we are using modules or not.
    247  */
    248 #ifndef __HAVE_VM_PAGE_MD
    249 #define	__HAVE_VM_PAGE_MD
    250 
    251 struct vm_page_md {
    252 	uintptr_t mdpg_dummy[3];
    253 };
    254 __CTASSERT(sizeof(struct vm_page_md) == sizeof(uintptr_t)*3);
    255 
    256 #endif /* !__HAVE_VM_PAGE_MD */
    257 
    258 #endif /* MODULAR || _MODULE */
    259 
    260 #endif /* !_RISCV_PMAP_H_ */
    261