2011-03-30 12:46:40 +00:00
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/*
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* Memory and machine-specific definitions. Used in C and assembler.
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*/
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/*
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* Sizes
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*/
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#define BI2BY 8 /* bits per byte */
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#define BI2WD 32 /* bits per word */
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#define BY2WD 4 /* bytes per word */
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#define BY2PG 4096 /* bytes per page */
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#define WD2PG (BY2PG/BY2WD) /* words per page */
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#define PGSHIFT 12 /* log(BY2PG) */
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#define PGROUND(s) (((s)+(BY2PG-1))&~(BY2PG-1))
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/*
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* Fundamental addresses
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*/
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2011-05-14 17:06:27 +00:00
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#define CONFADDR 0x1200 /* info passed from boot loader */
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#define BIOSXCHG 0x6000 /* To exchange data with the BIOS */
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2011-03-30 12:46:40 +00:00
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#define SELGDT (0<<3) /* selector is in gdt */
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#define SELLDT (1<<3) /* selector is in ldt */
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#define SELECTOR(i, t, p) (((i)<<3) | (t) | (p))
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/*
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* fields in segment descriptors
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*/
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#define SEGDATA (0x10<<8) /* data/stack segment */
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#define SEGEXEC (0x18<<8) /* executable segment */
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#define SEGTSS (0x9<<8) /* TSS segment */
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#define SEGCG (0x0C<<8) /* call gate */
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#define SEGIG (0x0E<<8) /* interrupt gate */
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#define SEGTG (0x0F<<8) /* task gate */
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#define SEGTYPE (0x1F<<8)
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#define SEGP (1<<15) /* segment present */
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#define SEGPL(x) ((x)<<13) /* priority level */
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#define SEGB (1<<22) /* granularity 1==4k (for expand-down) */
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#define SEGG (1<<23) /* granularity 1==4k (for other) */
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#define SEGE (1<<10) /* expand down */
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#define SEGW (1<<9) /* writable (for data/stack) */
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#define SEGR (1<<9) /* readable (for code) */
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#define SEGD (1<<22) /* default 1==32bit (for code) */
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