60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/* $NetBSD: mips_param.h,v 1.23 2006/08/28 13:43:35 yamt Exp $ */
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#ifdef _KERNEL
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#include <machine/cpu.h>
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#endif
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/*
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* On mips, UPAGES is fixed by sys/arch/mips/mips/locore code
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* to be the number of per-process-wired kernel-stack pages/PTES.
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*/
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#define SSIZE 1 /* initial stack size/NBPG */
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#define SINCR 1 /* increment of stack/NBPG */
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#define UPAGES 2 /* pages of u-area */
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#define USPACE (UPAGES*NBPG) /* size of u-area in bytes */
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#ifndef MSGBUFSIZE
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#define MSGBUFSIZE NBPG /* default message buffer size */
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#endif
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/*
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* Round p (pointer or byte index) up to a correctly-aligned value for all
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* data types (int, long, ...). The result is u_int and must be cast to
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* any desired pointer type.
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*
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* ALIGNED_POINTER is a boolean macro that checks whether an address
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* is valid to fetch data elements of type t from on this architecture.
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* This does not reflect the optimal alignment, just the possibility
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* (within reasonable limits).
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*
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*/
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#define ALIGNBYTES 7
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#define ALIGN(p) (((uintptr_t)(p) + ALIGNBYTES) & ~ALIGNBYTES)
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#define ALIGNED_POINTER(p,t) ((((uintptr_t)(p)) & (sizeof(t)-1)) == 0)
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#define NBPG 4096 /* bytes/page */
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#define PGOFSET (NBPG-1) /* byte offset into page */
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#define PGSHIFT 12 /* LOG2(NBPG) */
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#define NPTEPG (NBPG/4)
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#define NBSEG 0x400000 /* bytes/segment */
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#define SEGOFSET (NBSEG-1) /* byte offset into segment */
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#define SEGSHIFT 22 /* LOG2(NBSEG) */
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/*
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* Minimum and maximum sizes of the kernel malloc arena in PAGE_SIZE-sized
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* logical pages.
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*/
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#define NKMEMPAGES_MIN_DEFAULT ((8 * 1024 * 1024) >> PAGE_SHIFT)
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#define NKMEMPAGES_MAX_DEFAULT ((128 * 1024 * 1024) >> PAGE_SHIFT)
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/*
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* Mach derived conversion macros
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*/
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#define mips_round_page(x) ((((uintptr_t)(x)) + NBPG - 1) & ~(NBPG-1))
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#define mips_trunc_page(x) ((uintptr_t)(x) & ~(NBPG-1))
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#define mips_btop(x) ((paddr_t)(x) >> PGSHIFT)
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#define mips_ptob(x) ((paddr_t)(x) << PGSHIFT)
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