/*      $NetBSD: param.h,v 1.44 2026/05/10 16:07:56 thorpej Exp $       */

#ifdef __x86_64__

#ifndef XENPV
/* Must be defined before cpu.h */
#define MAXCPUS         256
#endif

#ifdef _KERNEL
#include <machine/cpu.h>
#if defined(_KERNEL_OPT)
#include "opt_kasan.h"
#include "opt_kmsan.h"
#include "opt_svs.h"
#endif
#endif

#define _MACHINE        amd64
#define MACHINE         "amd64"
#define _MACHINE_ARCH   x86_64
#define MACHINE_ARCH    "x86_64"
#define MID_MACHINE     MID_X86_64

#define ALIGNED_POINTER(p,t)            1
#define ALIGNED_POINTER_LOAD(q,p,t)     memcpy((q), (p), sizeof(t))

/*
 * Align stack as required by AMD64 System V ABI. This is because
 * (1) we want to bypass libc/csu in LLDB, and
 * (2) rtld in glibc >= 2.23 for Linux/x86_64 requires it.
 */
#define STACK_ALIGNBYTES        (16 - 1)
#define STACK_ALIGNBYTES32      (4 - 1)

#define ALIGNBYTES32            (sizeof(int) - 1)
#define ALIGN32(p)              (((u_long)(p) + ALIGNBYTES32) &~ALIGNBYTES32)

#define PGSHIFT         12              /* LOG2(NBPG) */
#define NBPG            (1 << PGSHIFT)  /* bytes/page */
#define PGOFSET         (NBPG-1)        /* byte offset into page */
#define NPTEPG          (NBPG/(sizeof (pt_entry_t)))

#define MAXIOMEM        0xffffffffffff

/*
 * Maximum physical memory supported by the implementation.
 */
#if defined(KMSAN)
#define MAXPHYSMEM      0x008000000000ULL /* 512GB */
#else
#define MAXPHYSMEM      0x100000000000ULL /* 16TB */
#endif

/*
 * XXXfvdl change this (after bootstrap) to take # of bits from
 * config info into account.
 */
#define KERNBASE        0xffffffff80000000 /* start of kernel virtual space */
#define KERNTEXTOFF     0xffffffff80200000 /* start of kernel text */

#define KERNTEXTOFF_HI  0xffffffff
#define KERNTEXTOFF_LO  0x80200000

#define KERNBASE_HI     0xffffffff
#define KERNBASE_LO     0x80000000

#if defined(KASAN) || defined(KMSAN)
#define UPAGES_KxSAN    3
#else
#define UPAGES_KxSAN    0
#endif
#if defined(SVS)
#define UPAGES_SVS      1
#else
#define UPAGES_SVS      0
#endif
#define UPAGES_PCB      1       /* one page for the PCB */
#define UPAGES_RED      1       /* one page for red zone between pcb/stack */
#define UPAGES_STACK    3       /* three pages (12 KiB) of stack space */
#define UPAGES          \
        (UPAGES_PCB + UPAGES_RED + UPAGES_STACK + UPAGES_SVS + UPAGES_KxSAN)

#ifndef _STANDALONE
#if defined(KASAN) || defined(KMSAN)
__CTASSERT(UPAGES == 8);
#elif defined(SVS)
__CTASSERT(UPAGES == 6);
#else
__CTASSERT(UPAGES == 5);
#endif
#endif  /* _STANDALONE */
#define USPACE          (UPAGES * NBPG) /* total size of u-area */

#ifndef MSGBUFSIZE
#define MSGBUFSIZE      (16*NBPG)       /* default message buffer size */
#endif

/*
 * Constants related to network buffer management.
 * MCLBYTES must be no larger than NBPG (the software page size), and,
 * on machines that exchange pages of input or output buffers with mbuf
 * clusters (MAPPED_MBUFS), MCLBYTES must also be an integral multiple
 * of the hardware page size.
 */
#define MSIZE           512             /* size of an mbuf */

#ifndef MCLSHIFT
#define MCLSHIFT        11              /* convert bytes to m_buf clusters */
                                        /* 2K cluster can hold Ether frame */
#endif  /* MCLSHIFT */

#define MCLBYTES        (1 << MCLSHIFT) /* size of a m_buf cluster */

#ifndef NFS_RSIZE
#define NFS_RSIZE       32768
#endif
#ifndef NFS_WSIZE
#define NFS_WSIZE       32768
#endif

/*
 * Minimum size of the kernel kmem_arena in PAGE_SIZE-sized
 * logical pages.
 * No enforced maximum on amd64.
 */
#define NKMEMPAGES_MIN_DEFAULT  ((8 * 1024 * 1024) >> PAGE_SHIFT)
#define NKMEMPAGES_MAX_UNLIMITED 1

/*
 * XXXfvdl the PD* stuff is different from i386.
 */
/*
 * Mach derived conversion macros
 */
#define x86_round_pdr(x) \
        ((((unsigned long)(x)) + (NBPD_L2 - 1)) & ~(NBPD_L2 - 1))
#define x86_trunc_pdr(x)        ((unsigned long)(x) & ~(NBPD_L2 - 1))
#define x86_btod(x)             ((unsigned long)(x) >> L2_SHIFT)
#define x86_dtob(x)             ((unsigned long)(x) << L2_SHIFT)
#define x86_round_page(x)       ((((unsigned long)(x)) + PGOFSET) & ~PGOFSET)
#define x86_trunc_page(x)       ((unsigned long)(x) & ~PGOFSET)
#define x86_btop(x)             ((unsigned long)(x) >> PGSHIFT)
#define x86_ptob(x)             ((unsigned long)(x) << PGSHIFT)

#define btop(x)                         x86_btop(x)
#define ptob(x)                         x86_ptob(x)

#else   /*      __x86_64__      */

#include <i386/param.h>

#endif  /*      __x86_64__      */