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      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__	*/
    158