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- /*
- * This file is part of the UCB release of Plan 9. It is subject to the license
- * terms in the LICENSE file found in the top-level directory of this
- * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
- * part of the UCB release of Plan 9, including this file, may be copied,
- * modified, propagated, or distributed except according to the terms contained
- * in the LICENSE file.
- */
- /*
- * Memory and machine-specific definitions. Used in C and assembler.
- */
- #define KiB 1024u /* 0x00000400 */
- #define MiB 1048576u /* 0x00100000 */
- #define GiB 1073741824u /* 0x40000000 */
- /*
- * Sizes
- */
- #define BI2BY 8 /* bits per byte */
- #define BI2WD 32 /* bits per word */
- #define BY2WD 4 /* bytes per word */
- #define BY2PG 4096 /* bytes per page */
- #define PGSHIFT 12 /* log(BY2PG) */
- #define PGROUND(s) (((s)+(BY2PG-1))&~(BY2PG-1))
- #define MAXMACH 1 /* max # cpus system can run */
- /*
- * Time
- */
- #define HZ (100) /* clock frequency */
- #define MS2HZ (1000/HZ) /* millisec per clock tick */
- #define TK2SEC(t) ((t)/HZ) /* ticks to seconds */
- #define TK2MS(x) ((x)*(1000/HZ))
- #define MS2TK(t) ((((ulong)(t))*HZ)/1000) /* milliseconds to ticks */
- /*
- * Fundamental addresses
- * To run in only protected mode (paging off),
- * #define KZERO 0
- * else
- * #define KZERO 0x80000000
- */
- #define KZERO 0 /* base of kernel address space */
- #define KTZERO KZERO /* first address in kernel text */
- #define ROMBIOS (KZERO|0xF0000)
- #define CONFADDR (KZERO+0x1200) /* info passed from boot loader */
- #define MACHSIZE (BY2PG*8) /* stack size */
- /*
- * known 80386 segments (in GDT) and their selectors
- */
- #define NULLSEG 0 /* null segment */
- #define KDSEG 1 /* kernel data/stack */
- #define KESEG 2 /* kernel executable */
- #define UDSEG 3 /* user data/stack */
- #define UESEG 4 /* user executable */
- #define SYSGATE 5 /* system call gate */
- #define TSSSEG 6 /* task segment */
- #define APMCSEG 6 /* APM code segment */
- #define APMCSEG16 7 /* APM 16-bit code segment */
- #define APMDSEG 8 /* APM data segment */
- #define NGDT 10 /* number of GDT entries required */
- #define SELGDT (0<<3) /* selector is in gdt */
- #define SELLDT (1<<3) /* selector is in ldt */
- #define SELECTOR(i, t, p) (((i)<<3) | (t) | (p))
- #define NULLSEL SELECTOR(NULLSEG, SELGDT, 0)
- #define KESEL SELECTOR(KESEG, SELGDT, 0)
- #define KDSEL SELECTOR(KDSEG, SELGDT, 0)
- #define UESEL SELECTOR(UESEG, SELGDT, 3)
- #define UDSEL SELECTOR(UDSEG, SELGDT, 3)
- #define TSSSEL SELECTOR(TSSSEG, SELGDT, 0)
- /*
- * fields in segment descriptors
- */
- #define SEGDATA (0x10<<8) /* data/stack segment */
- #define SEGEXEC (0x18<<8) /* executable segment */
- #define SEGTSS (0x9<<8) /* TSS segment */
- #define SEGCG (0x0C<<8) /* call gate */
- #define SEGIG (0x0E<<8) /* interrupt gate */
- #define SEGTG (0x0F<<8) /* task gate */
- #define SEGTYPE (0x1F<<8)
- #define SEGP (1<<15) /* segment present */
- #define SEGPL(x) ((x)<<13) /* priority level */
- #define SEGB (1<<22) /* granularity 1==4k (for expand-down) */
- #define SEGG (1<<23) /* granularity 1==4k (for other) */
- #define SEGE (1<<10) /* expand down */
- #define SEGW (1<<9) /* writable (for data/stack) */
- #define SEGR (1<<9) /* readable (for code) */
- #define SEGD (1<<22) /* default 1==32bit (for code) */
- /*
- * virtual MMU
- */
- #define PTEMAPMEM (1024*1024) /* ??? */
- #define SEGMAPSIZE 16 /* ??? */
- #define PTEPERTAB (PTEMAPMEM/BY2PG) /* ??? */
- #define PPN(x) ((x)&~(BY2PG-1))
- /*
- * physical MMU
- */
- #define PTEVALID (1<<0)
- #define PTEUNCACHED 0 /* everything is uncached */
- #define PTEWRITE (1<<1)
- #define PTERONLY (0<<1)
- #define PTEKERNEL (0<<2)
- #define PTEUSER (1<<2)
- #define PTESIZE (1<<7)
- /*
- * flag register bits that we care about
- */
- #define IFLAG 0x200
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