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Length: 4842 (0x12ea)
Types: TextFile
Notes: UNIX file
Names: »pte.h«
└─⟦26887b7e0⟧ Bits:30009717 Comet 32 harddisk image
└─⟦28c352965⟧ »/a« UNIX Filesystem
└─⟦this⟧ »usr/include/sys/pte.h«
/* * @(#)pte.h 3.11 9/2/83 * @(#)Copyright (C) 1983 by National Semiconductor Corp. */ typedef long pte; /* should be a structure, but that had problems */ /* Macros to access various parts of a virtual address */ #define VA_OFFSET 0x000001ff /* mask for offset portion */ #define VA_INDEX2 0x0000fe00 /* second level index */ #define VA_INDEX1 0x00ff0000 /* first level index */ #define VA_UNUSED 0xff000000 /* unused, illegal */ #define VA_USED 0x00ffffff /* legal parts of virtual addresses */ #define BUILDADDR(i1,i2,off) (((i1)<<16)|((i2)<<9)|(off)) /* build addr */ #define MAXPAGES (128 * 256) /* maximum number of virtual pages */ #define MAXPTE2ADDRS ((VA_OFFSET | VA_INDEX2) + 1) /* maximum pte2 address */ #define MAXADDRS (MAXPAGES * PGSIZE) /* maximum number of bytes */ /* Macros to extract offsets of various parts of an address while taking * into account the memory cluster size */ #define GETVOFF(d) ((d)&MCOFSET) /* extract offset */ #define GETV2OFF(d) ((d)&((1<<(MCSHIFT+7))-1)) /* 2nd level offset */ #define GETVI1(d) (((d)>>16)&(-MCPAGES)) /* extract level 1 */ #define GETVI2(d) (((d)>>9)&(0x7f*MCPAGES)) /* extract level 2 */ /* bit definitions within a pte */ #define PG_V 0x00000001 /* page is valid */ #define PG_PROT 0x00000006 /* protection level (see below) */ #define PG_REF 0x00000008 /* page has been referenced */ #define PG_MOD 0x00000010 /* page has been modified */ #define PG_UNUSED1 0x00000020 /* unused */ #define PG_UNUSED2 0x00000040 /* unused */ #define PG_RES1 0x00000080 /* reserved for software (see below) */ #define PG_RES2 0x00000100 /* reserved for software (see below) */ #define PG_PGNUM 0xfffffe00 /* page number (or other data ) */ #define PG_TYPE (PG_V|PG_RES1|PG_RES2) /* software defined pte type */ #define PG_FILE 0x00000200 /* in PT_DISK type, page is from file */ /* Kinds of protections */ #define PG_RONA 0x00000000 /* supervisor read, user no access */ #define PG_RWNA 0x00000002 /* sup read/write, user no access */ #define PG_RWRO 0x00000004 /* sup read/write, user read only */ #define PG_RWRW 0x00000006 /* sup read/write, user read/write */ /* Kinds of ptes. Selected by the PG_TYPE field of a pte. The PTEHASH macro * only works because of the location of the PG_V, PG_RES1 and PG_RES2 bits. * The PTEISMEM macro works only for specific memory pte type assignments. * So be wary of changing these definitions. */ #define PT_NULL 0 /* null pte */ #define PT_MEM PG_V /* normal memory */ #define PT_SPY (PG_V | PG_RES1) /* spying memory */ #define PT_LOCK (PG_V | PG_RES2) /* locked memory */ #define PT_DISK PG_RES1 /* disk page (file or swap) */ #define PT_SPT PG_RES2 /* indirect through spt */ #define PT_IOP (PG_RES1 | PG_RES2) /* memory page doing I/O */ /* Levels of page tables */ #define PTLEVEL1 1 /* level 1 page table */ #define PTLEVEL2 2 /* level 2 page table */ /* Pte related macros */ #define PTESIZE 4 /* number of bytes for a pte */ #define NPTEPG (NBPG/PTESIZE) /* number of ptes per page */ #define PTENULL ((pte) (0)) #define PTEBUILD(typ,addr,prot) ((pte)(((int)(addr)&PG_PGNUM)|((prot)|(typ)))) #define PTEMEM(addr,prot) (PTEBUILD(PT_MEM,addr,prot)) #define PTELOCK(addr, prot) (PTEBUILD(PT_LOCK,addr,prot)) #define PTEIOP(addr, prot) (PTEBUILD(PT_IOP,addr,prot)) #define PTESPY(addr,prot) (PTEBUILD(PT_SPY,addr,prot)) #define PTELOCK(addr, prot) (PTEBUILD(PT_LOCK,addr,prot)) #define PTESPT(idx,page,prot) (PTEBUILD(PT_SPT,((page)<<9)|((idx)<<24),prot)) #define PTEDISK(fbit,page,prot) \ (PTEBUILD(PT_DISK,((page)<<10)|((fbit)?PG_FILE:0),prot)) #define PTESWAP(page,prot) (PTEDISK(0,page,prot)) #define PTEFILE(page,prot) (PTEDISK(1,page,prot)) #define PTETYPE(pte) (((int)(pte)) & PG_TYPE) #define PTEHASH(pte) (PTETYPE(pte) % 9) #define PTEHASH_NULL (PTEHASH(PT_NULL)) #define PTEHASH_MEM (PTEHASH(PT_MEM)) #define PTEHASH_SPY (PTEHASH(PT_SPY)) #define PTEHASH_LOCK (PTEHASH(PT_LOCK)) #define PTEHASH_DISK (PTEHASH(PT_DISK)) #define PTEHASH_SPT (PTEHASH(PT_SPT)) #define PTEHASH_IOP (PTEHASH(PT_IOP)) #define PTEPROT(pte) (((int)(pte)) & PG_PROT) #define PTEVALID(pte) ((int)(pte) & PG_V) #define PTEINVALID(pte) (((int)(pte) & PG_V) == 0) #define PTEISMEM(pte) ((((int)(pte)) & (PG_V | PG_RES1)) == PG_V) #define PTEISSWAP(pte) (((int)(pte) & (PG_TYPE|PG_FILE)) == PT_DISK) #define PTEISFILE(pte) (((int)(pte) & (PG_TYPE|PG_FILE)) == (PT_DISK|PG_FILE)) #define PTEMEM_ADDR(pte) ((int)(pte) & PG_PGNUM) #define PTELOCK_ADDR(pte) ((int)(pte) & PG_PGNUM) #define PTEIOP_ADDR(pte) ((int)(pte) & PG_PGNUM) #define PTESPY_ADDR(pte) ((int)(pte) & PG_PGNUM) #define PTESWAP_PAGE(pte) ((unsigned)(pte) >> 10) #define PTEFILE_PAGE(pte) ((unsigned)(pte) >> 10) #define PTESPT_INDEX(pte) ((unsigned)(pte) >> 24) #define PTESPT_PAGE(pte) (((unsigned)(pte) >> 9) & 0x7fff)