/* $NetBSD: vmparam.h,v 1.18 2026/05/11 19:34:05 skrll Exp $ */ /*- * Copyright (c) 2014, 2020 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Matt Thomas of 3am Software Foundry, and Nick Hudson. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #ifndef _RISCV_VMPARAM_H_ #define _RISCV_VMPARAM_H_ #include <riscv/param.h> #ifdef _KERNEL_OPT #include "opt_multiprocessor.h" #endif /* * Machine dependent VM constants for RISC-V. */ /* * We use a 4K page on both RV64 and RV32 systems. * Override PAGE_* definitions to compile-time constants. */ #define PAGE_SHIFT PGSHIFT #define PAGE_SIZE (1 << PAGE_SHIFT) #define PAGE_MASK (PAGE_SIZE - 1) #ifdef _LP64 /* * Default pager_map of 16MB is awfully small. There is plenty * of VA so use it. */ #define PAGER_MAP_DEFAULT_SIZE (512 * 1024 * 1024) /* * Defaults for Unified Buffer Cache parameters. */ #ifndef UBC_WINSHIFT #define UBC_WINSHIFT 16 /* 64kB */ #endif #ifndef UBC_NWINS #define UBC_NWINS 4096 /* 256MB */ #endif #endif /* * USRSTACK is the top (end) of the user stack. * * USRSTACK needs to start a page below the maxuser address so that a memory * access with a maximum displacement (0x7ff) won't cross into the kernel's * address space. We use PAGE_SIZE instead of 0x800 since these need to be * page-aligned. */ #define USRSTACK (VM_MAXUSER_ADDRESS - PAGE_SIZE) /* Start of user stack */ #define USRSTACK32 ((uint32_t)VM_MAXUSER_ADDRESS32 - PAGE_SIZE) /* * Virtual memory related constants, all in bytes */ #ifndef MAXTSIZ #define MAXTSIZ (128*1024*1024) /* max text size */ #endif #ifndef DFLDSIZ #define DFLDSIZ (256*1024*1024) /* initial data size limit */ #endif #ifndef MAXDSIZ #define MAXDSIZ (1536*1024*1024) /* max data size */ #endif #ifndef DFLSSIZ #define DFLSSIZ (4*1024*1024) /* initial stack size limit */ #endif #ifndef MAXSSIZ #define MAXSSIZ (120*1024*1024) /* max stack size */ #endif /* * Virtual memory related constants, all in bytes */ #ifndef DFLDSIZ32 #define DFLDSIZ32 DFLDSIZ /* initial data size limit */ #endif #ifndef MAXDSIZ32 #define MAXDSIZ32 MAXDSIZ /* max data size */ #endif #ifndef DFLSSIZ32 #define DFLSSIZ32 DFLTSIZ /* initial stack size limit */ #endif #ifndef MAXSSIZ32 #define MAXSSIZ32 MAXSSIZ /* max stack size */ #endif /* * PTEs for mapping user space into the kernel for phyio operations. * The default PTE number is enough to cover 8 disks * MAXBSIZE. */ #ifndef USRIOSIZE #define USRIOSIZE (MAXBSIZE/PAGE_SIZE * 8) #endif /* * User/kernel map constants. */ #define VM_MIN_ADDRESS ((vaddr_t)PAGE_SIZE) #ifdef _LP64 /* Sv39 / Sv48 / Sv57 */ /* * SV39 gives 1 << (39 - 1) address space to kernel and same to userland. * This is 256GiB each. Split the kernel space in two and use the top half * for direct map. * * kernel virtual space layout: * 0xffff_ffc0_0000_0000 - 64GiB KERNEL VM Space (inc. text/data/bss) * (0xffff_ffc0_4000_0000 +1GiB) KERNEL VM start of KVA * (0xffff_ffd0_0000_0000 64GiB) reserved * 0xffff_ffe0_0000_0000 - 128GiB direct mapping */ #define VM_MAXUSER_ADDRESS ((vaddr_t)0x0000004000000000 - 16 * PAGE_SIZE) #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)0xffffffc000000000) #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)0xffffffd000000000) #else /* Sv32 */ /* * kernel virtual space layout without direct map (common case) * * 0x8000_0000 - 256MB kernel text/data/bss * 0x9000_0000 - 1536MB Kernel VM Space * 0xf000_0000 - 256MB IO * * kernel virtual space layout with KASAN * * 0x8000_0000 - 256MB kernel text/data/bss * 0x9000_0000 - 768MB Kernel VM Space * 0xc000_0000 - 128MB (KASAN SHADOW MAP) * 0xc800_0000 - 640MB (spare) * 0xf000_0000 - 256MB IO * * kernel virtual space layout with direct map (1GB limited) * 0x8000_0000 - 1024MB kernel text/data/bss and direct map start * 0xc000_0000 - 768MB Kernel VM Space * 0xf000_0000 - 256MB IO * */ #define VM_MAXUSER_ADDRESS ((vaddr_t)-0x7fffffff-1)/* 0xffff_ffff_8000_0000 */ #define VM_MIN_KERNEL_ADDRESS ((vaddr_t)-0x7fffffff-1)/* 0xffff_ffff_8000_0000 */ #define VM_MAX_KERNEL_ADDRESS ((vaddr_t)-0x10000000) /* 0xffff_ffff_f000_0000 */ #endif #define VM_KERNEL_BASE VM_MIN_KERNEL_ADDRESS #define VM_KERNEL_SIZE 0x2000000 /* 32 MiB (8 / 16 megapages) */ #define VM_KERNEL_DTB_BASE (VM_KERNEL_BASE + VM_KERNEL_SIZE) #define VM_KERNEL_DTB_SIZE 0x1000000 /* 16 MiB (4 / 8 megapages) */ #define VM_KERNEL_IO_BASE (VM_KERNEL_DTB_BASE + VM_KERNEL_DTB_SIZE) #define VM_KERNEL_IO_SIZE 0x1000000 /* 16 MiB (4 / 8 megapages) */ #define VM_KERNEL_RESERVED (VM_KERNEL_SIZE + VM_KERNEL_DTB_SIZE + VM_KERNEL_IO_SIZE) #define VM_KERNEL_VM_BASE (VM_MIN_KERNEL_ADDRESS + VM_KERNEL_RESERVED) #define VM_KERNEL_VM_SIZE (VM_MAX_KERNEL_ADDRESS - VM_KERNEL_VM_BASE) #define VM_MAX_ADDRESS VM_MAXUSER_ADDRESS #define VM_MAXUSER_ADDRESS32 ((vaddr_t)(1UL << 31))/* 0x0000000080000000 */ #ifdef _LP64 /* * Since we have the address space, we map all of physical memory (RAM) * using gigapages on SV39, terapages on SV48 and petapages on SV57. */ #define RISCV_DIRECTMAP_MASK ((vaddr_t) 0xffffffe000000000L) #define RISCV_DIRECTMAP_SIZE (-RISCV_DIRECTMAP_MASK - PAGE_SIZE) /* 128GiB */ #define RISCV_DIRECTMAP_START RISCV_DIRECTMAP_MASK #define RISCV_DIRECTMAP_END (RISCV_DIRECTMAP_START + RISCV_DIRECTMAP_SIZE) #define RISCV_DIRECTMAP_P(va) (((vaddr_t) (va) & RISCV_DIRECTMAP_MASK) == RISCV_DIRECTMAP_MASK) #define RISCV_PA_TO_KVA(pa) ((vaddr_t) ((pa) | RISCV_DIRECTMAP_START)) #define RISCV_KVA_TO_PA(va) ((paddr_t) ((va) & ~RISCV_DIRECTMAP_MASK)) #endif /* * The address to which unspecified mapping requests default */ #define __USE_TOPDOWN_VM #define VM_DEFAULT_ADDRESS_TOPDOWN(da, sz) \ trunc_page(USRSTACK - MAXSSIZ - (sz) - user_stack_guard_size) #define VM_DEFAULT_ADDRESS_BOTTOMUP(da, sz) \ round_page((vaddr_t)(da) + (vsize_t)maxdmap) #define VM_DEFAULT_ADDRESS32_TOPDOWN(da, sz) \ trunc_page(USRSTACK32 - MAXSSIZ32 - (sz) - user_stack_guard_size) #define VM_DEFAULT_ADDRESS32_BOTTOMUP(da, sz) \ round_page((vaddr_t)(da) + (vsize_t)MAXDSIZ32) /* virtual sizes (bytes) for various kernel submaps */ #define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE) /* * max number of non-contig chunks of physical RAM you can have */ #define VM_PHYSSEG_MAX 64 /* * when converting a physical address to a vm_page structure, we * want to use a binary search on the chunks of physical memory * to find our RAM */ #define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH #ifndef VM_NFREELIST #define VM_NFREELIST 2 /* 2 distinct memory segments */ #define VM_FREELIST_DEFAULT 0 #define VM_FREELIST_DIRECTMAP 1 #endif #ifdef _KERNEL #ifdef _LP64 void * cpu_uarea_alloc(bool); bool cpu_uarea_free(void *); #endif #endif #endif /* ! _RISCV_VMPARAM_H_ */
