mirror of
https://codeberg.org/ziglang/zig.git
synced 2026-04-28 19:47:08 +03:00
Alex Rønne Petersen
66d97267c7
This excludes all headers in /usr/include/dev because that directory is bonkers huge (18M). We can add these on an as-needed basis.
150 lines
4.9 KiB
C
Vendored
150 lines
4.9 KiB
C
Vendored
/* $OpenBSD: vmparam.h,v 1.9 2023/11/28 09:10:18 jsg Exp $ */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)vmparam.h 5.9 (Berkeley) 5/12/91
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*/
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#ifndef _MACHINE_VMPARAM_H_
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#define _MACHINE_VMPARAM_H_
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/*
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* Machine dependent constants for riscv64.
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*/
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#define USRSTACK VM_MAXUSER_ADDRESS
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/*
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* Virtual memory related constants, all in bytes
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*/
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#ifndef MAXTSIZ
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#define MAXTSIZ ((paddr_t)1*1024*1024*1024) /* max text size */
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#endif
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#ifndef DFLDSIZ
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#define DFLDSIZ ((paddr_t)128*1024*1024) /* initial data size limit */
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#endif
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#ifndef MAXDSIZ
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#define MAXDSIZ ((paddr_t)16*1024*1024*1024) /* max data size */
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#endif
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#ifndef BRKSIZ
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#define BRKSIZ ((paddr_t)1*1024*1024*1024) /* heap gap size */
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#endif
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#ifndef DFLSSIZ
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#define DFLSSIZ ((paddr_t)128*1024*1024) /* initial stack size limit */
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#endif
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#ifndef MAXSSIZ
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#define MAXSSIZ ((paddr_t)1*1024*1024*1024) /* max stack size */
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#endif
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#define STACKGAP_RANDOM 256*1024
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/*
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* Size of shared memory map
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*/
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#ifndef SHMMAXPGS
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#define SHMMAXPGS 1024
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#endif
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/*
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* Size of User Raw I/O map
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*/
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#define USRIOSIZE 300
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/**
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* Address space layout.
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*
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* RISC-V implements multiple paging modes with different virtual address space
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* sizes: SV32, SV39 and SV48. SV39 permits a virtual address space size of
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* 512GB and uses a three-level page table. Since this is large enough for most
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* purposes, we currently use SV39 for both userland and the kernel, avoiding
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* the extra translation step required by SV48.
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*
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* The address space is split into two regions at each end of the 64-bit address
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* space:
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*
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* 0x0000000000000000 - 0x0000003fffffffff 256GB user map
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* 0x0000004000000000 - 0xffffffbfffffffff unmappable
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* 0xffffffc000000000 - 0xffffffc7ffffffff 32GB kernel map
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* 0xffffffc800000000 - 0xffffffcfffffffff 32GB unused
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* 0xffffffd000000000 - 0xffffffefffffffff 128GB direct map
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* 0xfffffff000000000 - 0xffffffffffffffff 64GB unused
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*
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* The kernel is loaded at the beginning of the kernel map.
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*
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* We define some interesting address constants:
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*
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* VM_MIN_ADDRESS and VM_MAX_ADDRESS define the start and end of the entire
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* 64 bit address space, mostly just for convenience.
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*
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* VM_MIN_KERNEL_ADDRESS and VM_MAX_KERNEL_ADDRESS define the start and end of
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* mappable kernel virtual address space.
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*
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* VM_MIN_ADDRESS and VM_MAXUSER_ADDRESS define the start and end of the
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* user address space.
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*/
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#define VM_MIN_ADDRESS ((vaddr_t)PAGE_SIZE)
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#define VM_MAX_ADDRESS (0xffffffffffffffffUL)
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#define VM_MIN_KERNEL_ADDRESS (0xffffffc000000000UL)
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#define VM_MAX_KERNEL_ADDRESS (0xffffffc800000000UL)
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/* Kernel L1 Page Table Range */
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#define L1_KERN_BASE (256)
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#define L1_KERN_ENTRIES (288 - L1_KERN_BASE)
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#define DMAP_MIN_ADDRESS (0xffffffd000000000UL)
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#define DMAP_MAX_ADDRESS (0xfffffff000000000UL)
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/* DMAP L1 Page Table Range */
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#define L1_DMAP_BASE (320)
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#define L1_DMAP_ENTRIES (448 - L1_DMAP_BASE)
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#define VM_MAXUSER_ADDRESS (0x0000004000000000UL) /* 39 bits */
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#ifdef _KERNEL
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#define VM_MIN_STACK_ADDRESS (VM_MAXUSER_ADDRESS * 3 / 4)
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#endif
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#define KERNBASE (VM_MIN_KERNEL_ADDRESS)
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#ifndef _LOCORE
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extern paddr_t dmap_phys_base;
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#endif
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/* virtual sizes (bytes) for various kernel submaps */
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#define VM_PHYS_SIZE (USRIOSIZE*PAGE_SIZE)
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#define VM_PHYSSEG_MAX 32
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#define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH
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#define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */
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#endif /* _MACHINE_VMPARAM_H_ */ |