1/* $NetBSD: param.h,v 1.42 2025/04/27 01:32:09 riastradh Exp $ */
2
3#ifdef __x86_64__
4
5#ifndef XENPV
6/* Must be defined before cpu.h */
7#define MAXCPUS 256
8#endif
9
10#ifdef _KERNEL
11#include <machine/cpu.h>
12#if defined(_KERNEL_OPT)
13#include "opt_kasan.h"
14#include "opt_kmsan.h"
15#include "opt_svs.h"
16#endif
17#endif
18
19#define _MACHINE amd64
20#define MACHINE "amd64"
21#define _MACHINE_ARCH x86_64
22#define MACHINE_ARCH "x86_64"
23#define MID_MACHINE MID_X86_64
24
25#define ALIGNED_POINTER(p,t) 1
26#define ALIGNED_POINTER_LOAD(q,p,t) memcpy((q), (p), sizeof(t))
27
28/*
29 * Align stack as required by AMD64 System V ABI. This is because
30 * (1) we want to bypass libc/csu in LLDB, and
31 * (2) rtld in glibc >= 2.23 for Linux/x86_64 requires it.
32 */
33#define STACK_ALIGNBYTES (16 - 1)
34#define STACK_ALIGNBYTES32 (4 - 1)
35
36#define ALIGNBYTES32 (sizeof(int) - 1)
37#define ALIGN32(p) (((u_long)(p) + ALIGNBYTES32) &~ALIGNBYTES32)
38
39#define PGSHIFT 12 /* LOG2(NBPG) */
40#define NBPG (1 << PGSHIFT) /* bytes/page */
41#define PGOFSET (NBPG-1) /* byte offset into page */
42#define NPTEPG (NBPG/(sizeof (pt_entry_t)))
43
44#define MAXIOMEM 0xffffffffffff
45
46/*
47 * Maximum physical memory supported by the implementation.
48 */
49#if defined(KMSAN)
50#define MAXPHYSMEM 0x008000000000ULL /* 512GB */
51#else
52#define MAXPHYSMEM 0x100000000000ULL /* 16TB */
53#endif
54
55/*
56 * XXXfvdl change this (after bootstrap) to take # of bits from
57 * config info into account.
58 */
59#define KERNBASE 0xffffffff80000000 /* start of kernel virtual space */
60#define KERNTEXTOFF 0xffffffff80200000 /* start of kernel text */
61#define BTOPKERNBASE ((u_long)KERNBASE >> PGSHIFT)
62
63#define KERNTEXTOFF_HI 0xffffffff
64#define KERNTEXTOFF_LO 0x80200000
65
66#define KERNBASE_HI 0xffffffff
67#define KERNBASE_LO 0x80000000
68
69#define SSIZE 1 /* initial stack size/NBPG */
70#define SINCR 1 /* increment of stack/NBPG */
71
72#if defined(KASAN) || defined(KMSAN)
73#define UPAGES_KxSAN 3
74#else
75#define UPAGES_KxSAN 0
76#endif
77#if defined(SVS)
78#define UPAGES_SVS 1
79#else
80#define UPAGES_SVS 0
81#endif
82#define UPAGES_PCB 1 /* one page for the PCB */
83#define UPAGES_RED 1 /* one page for red zone between pcb/stack */
84#define UPAGES_STACK 3 /* three pages (12 KiB) of stack space */
85#define UPAGES \
86 (UPAGES_PCB + UPAGES_RED + UPAGES_STACK + UPAGES_SVS + UPAGES_KxSAN)
87
88#ifndef _STANDALONE
89#if defined(KASAN) || defined(KMSAN)
90__CTASSERT(UPAGES == 8);
91#elif defined(SVS)
92__CTASSERT(UPAGES == 6);
93#else
94__CTASSERT(UPAGES == 5);
95#endif
96#endif /* _STANDALONE */
97#define USPACE (UPAGES * NBPG) /* total size of u-area */
98
99#ifndef MSGBUFSIZE
100#define MSGBUFSIZE (16*NBPG) /* default message buffer size */
101#endif
102
103/*
104 * Constants related to network buffer management.
105 * MCLBYTES must be no larger than NBPG (the software page size), and,
106 * on machines that exchange pages of input or output buffers with mbuf
107 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
108 * of the hardware page size.
109 */
110#define MSIZE 512 /* size of an mbuf */
111
112#ifndef MCLSHIFT
113#define MCLSHIFT 11 /* convert bytes to m_buf clusters */
114 /* 2K cluster can hold Ether frame */
115#endif /* MCLSHIFT */
116
117#define MCLBYTES (1 << MCLSHIFT) /* size of a m_buf cluster */
118
119#ifndef NFS_RSIZE
120#define NFS_RSIZE 32768
121#endif
122#ifndef NFS_WSIZE
123#define NFS_WSIZE 32768
124#endif
125
126/*
127 * Minimum size of the kernel kmem_arena in PAGE_SIZE-sized
128 * logical pages.
129 * No enforced maximum on amd64.
130 */
131#define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT)
132#define NKMEMPAGES_MAX_UNLIMITED 1
133
134/*
135 * XXXfvdl the PD* stuff is different from i386.
136 */
137/*
138 * Mach derived conversion macros
139 */
140#define x86_round_pdr(x) \
141 ((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1))
142#define x86_trunc_pdr(x) ((unsigned long)(x) & ~(NBPD_L2 - 1))
143#define x86_btod(x) ((unsigned long)(x) >> L2_SHIFT)
144#define x86_dtob(x) ((unsigned long)(x) << L2_SHIFT)
145#define x86_round_page(x) ((((unsigned long)(x)) + PGOFSET) & ~PGOFSET)
146#define x86_trunc_page(x) ((unsigned long)(x) & ~PGOFSET)
147#define x86_btop(x) ((unsigned long)(x) >> PGSHIFT)
148#define x86_ptob(x) ((unsigned long)(x) << PGSHIFT)
149
150#define btop(x) x86_btop(x)
151#define ptob(x) x86_ptob(x)
152
153#else /* __x86_64__ */
154
155#include <i386/param.h>
156
157#endif /* __x86_64__ */