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pmap.h revision 1.22 
      1 /* $NetBSD: pmap.h,v 1.22 2023/10/06 08:48:49 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 #define	PMAP_TLB_ALWAYS_ASIDS		false
     85 #ifdef _LP64
     86 #define	PMAP_INVALID_PDETAB_ADDRESS	((pmap_pdetab_t *)(VM_MIN_KERNEL_ADDRESS - PAGE_SIZE))
     87 #define	PMAP_INVALID_SEGTAB_ADDRESS	((pmap_segtab_t *)(VM_MIN_KERNEL_ADDRESS - PAGE_SIZE))
     88 #else
     89 #define	PMAP_INVALID_PDETAB_ADDRESS	((pmap_pdetab_t *)0xdeadbeef)
     90 #define	PMAP_INVALID_SEGTAB_ADDRESS	((pmap_segtab_t *)0xdeadbeef)
     91 #endif
     92 #define	PMAP_TLB_NUM_PIDS		(__SHIFTOUT_MASK(SATP_ASID) + 1)
     93 #define	PMAP_TLB_BITMAP_LENGTH          PMAP_TLB_NUM_PIDS
     94 #define	PMAP_TLB_FLUSH_ASID_ON_RESET	true
     95 
     96 #define	pmap_phys_address(x)		(x)
     97 
     98 #ifndef __BSD_PTENTRY_T__
     99 #define	__BSD_PTENTRY_T__
    100 #ifdef _LP64
    101 #define	PRIxPTE         PRIx64
    102 #else
    103 #define	PRIxPTE         PRIx32
    104 #endif
    105 #endif /* __BSD_PTENTRY_T__ */
    106 
    107 #define	PMAP_NEED_PROCWR
    108 static inline void
    109 pmap_procwr(struct proc *p, vaddr_t va, vsize_t len)
    110 {
    111 	__asm __volatile("fence\trw,rw; fence.i" ::: "memory");
    112 }
    113 
    114 #include <uvm/pmap/tlb.h>
    115 #include <uvm/pmap/pmap_devmap.h>
    116 #include <uvm/pmap/pmap_tlb.h>
    117 #include <uvm/pmap/pmap_synci.h>
    118 
    119 #define	PMAP_GROWKERNEL
    120 #define	PMAP_STEAL_MEMORY
    121 
    122 #ifdef _KERNEL
    123 
    124 #define	__HAVE_PMAP_MD
    125 struct pmap_md {
    126 	paddr_t md_ppn;
    127 };
    128 
    129 static inline void
    130 pmap_md_icache_sync_all(void)
    131 {
    132 }
    133 
    134 static inline void
    135 pmap_md_icache_sync_range_index(vaddr_t va, vsize_t size)
    136 {
    137 }
    138 
    139 struct vm_page *
    140 	pmap_md_alloc_poolpage(int);
    141 vaddr_t	pmap_md_map_poolpage(paddr_t, vsize_t);
    142 void	pmap_md_unmap_poolpage(vaddr_t, vsize_t);
    143 
    144 bool	pmap_md_direct_mapped_vaddr_p(vaddr_t);
    145 paddr_t	pmap_md_direct_mapped_vaddr_to_paddr(vaddr_t);
    146 vaddr_t	pmap_md_direct_map_paddr(paddr_t);
    147 void	pmap_md_init(void);
    148 bool	pmap_md_io_vaddr_p(vaddr_t);
    149 bool	pmap_md_ok_to_steal_p(const uvm_physseg_t, size_t);
    150 void	pmap_md_pdetab_init(struct pmap *);
    151 void	pmap_md_pdetab_fini(struct pmap *);
    152 void	pmap_md_tlb_info_attach(struct pmap_tlb_info *, struct cpu_info *);
    153 void	pmap_md_xtab_activate(struct pmap *, struct lwp *);
    154 void	pmap_md_xtab_deactivate(struct pmap *);
    155 
    156 void	pmap_bootstrap(vaddr_t, vaddr_t);
    157 
    158 vsize_t	pmap_kenter_range(vaddr_t, paddr_t, vsize_t, vm_prot_t, u_int);
    159 
    160 #ifdef _LP64
    161 extern vaddr_t pmap_direct_base;
    162 extern vaddr_t pmap_direct_end;
    163 #define	PMAP_DIRECT_MAP(pa)	RISCV_PA_TO_KVA(pa)
    164 #define	PMAP_DIRECT_UNMAP(va)	RISCV_KVA_TO_PA(va)
    165 
    166 /*
    167  * Other hooks for the pool allocator.
    168  */
    169 #define	POOL_PHYSTOV(pa)	RISCV_PA_TO_KVA((paddr_t)(pa))
    170 #define	POOL_VTOPHYS(va)	RISCV_KVA_TO_PA((vaddr_t)(va))
    171 
    172 #endif	/* _LP64 */
    173 
    174 #define	MEGAPAGE_TRUNC(x)	((x) & ~SEGOFSET)
    175 #define	MEGAPAGE_ROUND(x)	MEGAPAGE_TRUNC((x) + SEGOFSET)
    176 
    177 #define	PMAP_DEV		__BIT(29)	/* 0x2000_0000 */
    178 
    179 #define	DEVMAP_ALIGN(x)		MEGAPAGE_TRUNC((x))
    180 #define	DEVMAP_SIZE(x)		MEGAPAGE_ROUND((x))
    181 #define	DEVMAP_FLAGS		PMAP_DEV
    182 
    183 #ifdef __PMAP_PRIVATE
    184 
    185 static inline bool
    186 pmap_md_tlb_check_entry(void *ctx, vaddr_t va, tlb_asid_t asid, pt_entry_t pte)
    187 {
    188         // TLB not walked and so not called.
    189         return false;
    190 }
    191 
    192 static inline void
    193 pmap_md_page_syncicache(struct vm_page_md *mdpg, const kcpuset_t *onproc)
    194 {
    195 	__asm __volatile("fence\trw,rw; fence.i" ::: "memory");
    196 }
    197 
    198 /*
    199  * Virtual Cache Alias helper routines.  Not a problem for RISCV CPUs.
    200  */
    201 static inline bool
    202 pmap_md_vca_add(struct vm_page_md *mdpg, vaddr_t va, pt_entry_t *nptep)
    203 {
    204 	return false;
    205 }
    206 
    207 static inline void
    208 pmap_md_vca_remove(struct vm_page_md *mdpg, vaddr_t va)
    209 {
    210 }
    211 
    212 static inline void
    213 pmap_md_vca_clean(struct vm_page_md *mdpg, vaddr_t va, int op)
    214 {
    215 }
    216 
    217 static inline size_t
    218 pmap_md_tlb_asid_max(void)
    219 {
    220 	return PMAP_TLB_NUM_PIDS - 1;
    221 }
    222 
    223 static inline pt_entry_t *
    224 pmap_md_nptep(pt_entry_t *ptep)
    225 {
    226 	return ptep + 1;
    227 }
    228 
    229 #endif /* __PMAP_PRIVATE */
    230 #endif /* _KERNEL */
    231 
    232 #include <uvm/pmap/pmap.h>
    233 
    234 #endif /* !_MODULE */
    235 
    236 #if defined(MODULAR) || defined(_MODULE)
    237 /*
    238  * Define a compatible vm_page_md so that struct vm_page is the same size
    239  * whether we are using modules or not.
    240  */
    241 #ifndef __HAVE_VM_PAGE_MD
    242 #define	__HAVE_VM_PAGE_MD
    243 
    244 struct vm_page_md {
    245 	uintptr_t mdpg_dummy[3];
    246 };
    247 __CTASSERT(sizeof(struct vm_page_md) == sizeof(uintptr_t)*3);
    248 
    249 #endif /* !__HAVE_VM_PAGE_MD */
    250 
    251 #endif /* MODULAR || _MODULE */
    252 
    253 #endif /* !_RISCV_PMAP_H_ */
    254