/* $NetBSD: vmparam.h,v 1.6 2026/05/04 19:31:46 thorpej Exp $ */ /* * Dummy <machine/vmparam.h> for rump. * * Written by Jason R. Thorpe, May 1, 2026. * Public domain. */ #ifndef _SYS_RUMP_VMPARAM_H_ #define _SYS_RUMP_VMPARAM_H_ /* * We have VM page sizes ranging from 2K to 16K. * * Note that mbufs use MIN_PAGE_SHIFT to calculate the number of * external pages that can be associated with an M_EXT mbuf. On * LP64 platforms we can easily get into trouble and overflow the * required space (within MSIZE) because pointers are 8 bytes. * If a platform has a 256-byte MSIZE, then MIN_PAGE_SIZE must be * at least 8K. And we know this is true because the compile-time * asserts pass when building the kernel on those platforms. If * the platform's MSIZE is 512 (as it is on amd64, for example), * then a 4K page size is OK. */ #ifdef _LP64 #define MIN_PAGE_SHIFT (12 + (MSIZE == 256)) #else #define MIN_PAGE_SHIFT 11 #endif #define MAX_PAGE_SHIFT 14 #define MIN_PAGE_SIZE (1 << MIN_PAGE_SHIFT) #define MAX_PAGE_SIZE (1 << MAX_PAGE_SHIFT) /* * 16MB ought to be enough for anybody, really. Especially * considering that user-space doesn't really exist in RUMP. */ #define VM_MIN_ADDRESS ((vaddr_t)0) #define VM_MAX_ADDRESS ((vaddr_t)0x01000000) #define VM_MAXUSER_ADDRESS VM_MAX_ADDRESS /* * Stack starts at the top of the user's address space. */ #define USRSTACK VM_MAX_ADDRESS /* * Resource limits that are incredibly generous for a * non-existent user-space. */ #define MAXTSIZ (5*1024*1024) #define DFLDSIZ (4*1024*1024) #define MAXDSIZ (6*1024*1024) #define DFLSSIZ (512*1024) #define MAXSSIZ (4*1024*1024) /* * The RUMP virtual machine has one physical memory segment and * one page free list. */ #define VM_PHYSSEG_MAX 1 #define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH #define VM_NFREELIST 1 #define VM_FREELIST_DEFAULT 0 #endif /* _SYS_RUMP_VMPARAM_H_ */
