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param.h revision 1.37 
      1 /*	$NetBSD: param.h,v 1.37 2020/03/17 17:18:49 maxv 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 #endif
     16 #endif
     17 
     18 #define	_MACHINE	amd64
     19 #define	MACHINE		"amd64"
     20 #define	_MACHINE_ARCH	x86_64
     21 #define	MACHINE_ARCH	"x86_64"
     22 #define MID_MACHINE	MID_X86_64
     23 
     24 #define ALIGNED_POINTER(p,t)		1
     25 #define ALIGNED_POINTER_LOAD(q,p,t)	memcpy((q), (p), sizeof(t))
     26 
     27 /*
     28  * Align stack as required by AMD64 System V ABI. This is because
     29  * (1) we want to bypass libc/csu in LLDB, and
     30  * (2) rtld in glibc >= 2.23 for Linux/x86_64 requires it.
     31  */
     32 #define STACK_ALIGNBYTES	(16 - 1)
     33 
     34 #define ALIGNBYTES32		(sizeof(int) - 1)
     35 #define ALIGN32(p)		(((u_long)(p) + ALIGNBYTES32) &~ALIGNBYTES32)
     36 
     37 #define	PGSHIFT		12		/* LOG2(NBPG) */
     38 #define	NBPG		(1 << PGSHIFT)	/* bytes/page */
     39 #define	PGOFSET		(NBPG-1)	/* byte offset into page */
     40 #define	NPTEPG		(NBPG/(sizeof (pt_entry_t)))
     41 
     42 #define	MAXIOMEM	0xffffffffffff
     43 
     44 /*
     45  * Maximum physical memory supported by the implementation.
     46  */
     47 #if defined(KMSAN)
     48 #define MAXPHYSMEM	0x008000000000ULL /* 512GB */
     49 #else
     50 #define MAXPHYSMEM	0x100000000000ULL /* 16TB */
     51 #endif
     52 
     53 /*
     54  * XXXfvdl change this (after bootstrap) to take # of bits from
     55  * config info into account.
     56  */
     57 #define	KERNBASE	0xffffffff80000000 /* start of kernel virtual space */
     58 #define	KERNTEXTOFF	0xffffffff80200000 /* start of kernel text */
     59 #define	BTOPKERNBASE	((u_long)KERNBASE >> PGSHIFT)
     60 
     61 #define KERNTEXTOFF_HI	0xffffffff
     62 #define KERNTEXTOFF_LO	0x80200000
     63 
     64 #define KERNBASE_HI	0xffffffff
     65 #define KERNBASE_LO	0x80000000
     66 
     67 #define	SSIZE		1		/* initial stack size/NBPG */
     68 #define	SINCR		1		/* increment of stack/NBPG */
     69 
     70 #if defined(KASAN) || defined(KMSAN)
     71 #define	UPAGES		8
     72 #else
     73 #define	UPAGES		5		/* pages of u-area (1 for redzone) */
     74 #endif
     75 #define	USPACE		(UPAGES * NBPG)	/* total size of u-area */
     76 
     77 #ifndef MSGBUFSIZE
     78 #define MSGBUFSIZE	(16*NBPG)	/* default message buffer size */
     79 #endif
     80 
     81 /*
     82  * Constants related to network buffer management.
     83  * MCLBYTES must be no larger than NBPG (the software page size), and,
     84  * on machines that exchange pages of input or output buffers with mbuf
     85  * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
     86  * of the hardware page size.
     87  */
     88 #define	MSIZE		512		/* size of an mbuf */
     89 
     90 #ifndef MCLSHIFT
     91 #define	MCLSHIFT	11		/* convert bytes to m_buf clusters */
     92 					/* 2K cluster can hold Ether frame */
     93 #endif	/* MCLSHIFT */
     94 
     95 #define	MCLBYTES	(1 << MCLSHIFT)	/* size of a m_buf cluster */
     96 
     97 #ifndef NFS_RSIZE
     98 #define NFS_RSIZE       32768
     99 #endif
    100 #ifndef NFS_WSIZE
    101 #define NFS_WSIZE       32768
    102 #endif
    103 
    104 /*
    105  * Minimum size of the kernel kmem_arena in PAGE_SIZE-sized
    106  * logical pages.
    107  * No enforced maximum on amd64.
    108  */
    109 #define	NKMEMPAGES_MIN_DEFAULT	((8 * 1024 * 1024) >> PAGE_SHIFT)
    110 #define	NKMEMPAGES_MAX_UNLIMITED 1
    111 
    112 /*
    113  * XXXfvdl the PD* stuff is different from i386.
    114  */
    115 /*
    116  * Mach derived conversion macros
    117  */
    118 #define	x86_round_pdr(x) \
    119 	((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1))
    120 #define	x86_trunc_pdr(x)	((unsigned long)(x) & ~(NBPD_L2 - 1))
    121 #define	x86_btod(x)		((unsigned long)(x) >> L2_SHIFT)
    122 #define	x86_dtob(x)		((unsigned long)(x) << L2_SHIFT)
    123 #define	x86_round_page(x)	((((unsigned long)(x)) + PGOFSET) & ~PGOFSET)
    124 #define	x86_trunc_page(x)	((unsigned long)(x) & ~PGOFSET)
    125 #define	x86_btop(x)		((unsigned long)(x) >> PGSHIFT)
    126 #define	x86_ptob(x)		((unsigned long)(x) << PGSHIFT)
    127 
    128 #define btop(x)				x86_btop(x)
    129 #define ptob(x)				x86_ptob(x)
    130 
    131 #else	/*	__x86_64__	*/
    132 
    133 #include <i386/param.h>
    134 
    135 #endif	/*	__x86_64__	*/
    136