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/* * Copyright (c) 1992 NeXT Computer, Inc. * * Intel386 Family: Virtual memory constants. * * HISTORY * * 14 April 1992 David E. Bohman at NeXT * Created. */ #ifndef _MACH_I386_VM_PARAM_H_ #define _MACH_I386_VM_PARAM_H_ #import <sys/types.h> #define BYTE_SIZE 8 /* byte size in bits */ #define BYTE_MSF 0 #define I386_PGBYTES 4096 /* bytes per 80386 page */ #define I386_PGSHIFT 12 /* number of bits to shift for pages */ /* * Convert bytes to pages and convert pages to bytes. * No rounding is used. */ #define i386_btop(x) (((unsigned)(x)) >> I386_PGSHIFT) #define i386_ptob(x) (((unsigned)(x)) << I386_PGSHIFT) /* * Round off or truncate to the nearest page. These will work * for either addresses or counts. (i.e. 1 byte rounds to 1 page * bytes. */ #define i386_round_page(x) ((((unsigned)(x)) + I386_PGBYTES - 1) & \ ~(I386_PGBYTES-1)) #define i386_trunc_page(x) (((unsigned)(x)) & ~(I386_PGBYTES-1)) #define VM_MIN_ADDRESS ((vm_offset_t) 0) #define VM_MAX_ADDRESS ((vm_offset_t) 0xc0000000) #define VM_MIN_KERNEL_ADDRESS ((vm_offset_t) 0x00000000) #define VM_MAX_KERNEL_ADDRESS ((vm_offset_t) 0x40000000) #define KERNSTACK_SIZE (1*I386_PGBYTES) #define INTSTACK_SIZE (1*I386_PGBYTES) /* * Conversion between 80386 pages and VM pages */ #define trunc_i386_to_vm(p) (atop(trunc_page(i386_ptob(p)))) #define round_i386_to_vm(p) (atop(round_page(i386_ptob(p)))) #define vm_to_i386(p) (i386_btop(ptoa(p))) /* * Maximum alignment required by any data type for this architecture. * (Use 4 bytes for performance reasons....) */ #define MAX_DATA_ALIGNMENT 4 /* 4 bytes */ #endif
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