2 * Copyright (c) 1990 The Regents of the University of California.
5 * This code is derived from software contributed to Berkeley by
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9 * modification, are permitted provided that the following conditions
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29 * from: @(#)param.h 5.8 (Berkeley) 6/28/91
33 #ifndef _MACHINE_PARAM_H_
34 #define _MACHINE_PARAM_H_
37 * Machine dependent constants for RISC-V.
40 #include <machine/_align.h>
42 #define STACKALIGNBYTES (16 - 1)
43 #define STACKALIGN(p) ((uint64_t)(p) & ~STACKALIGNBYTES)
46 #define MACHINE "riscv"
49 #define MACHINE_ARCH "riscv64"
52 #if defined(SMP) || defined(KLD_MODULE)
58 #endif /* SMP || KLD_MODULE */
64 #define ALIGNBYTES _ALIGNBYTES
65 #define ALIGN(p) _ALIGN(p)
67 * ALIGNED_POINTER is a boolean macro that checks whether an address
68 * is valid to fetch data elements of type t from on this architecture.
69 * This does not reflect the optimal alignment, just the possibility
70 * (within reasonable limits).
72 #define ALIGNED_POINTER(p, t) ((((u_long)(p)) & (sizeof(t) - 1)) == 0)
75 * CACHE_LINE_SIZE is the compile-time maximum cache line size for an
76 * architecture. It should be used with appropriate caution.
78 #define CACHE_LINE_SHIFT 6
79 #define CACHE_LINE_SIZE (1 << CACHE_LINE_SHIFT)
82 #define PAGE_SIZE (1 << PAGE_SHIFT) /* Page size */
83 #define PAGE_MASK (PAGE_SIZE - 1)
85 #define MAXPAGESIZES 3 /* maximum number of supported page sizes */
88 #define KSTACK_PAGES 4 /* pages of kernel stack (with pcb) */
91 #define KSTACK_GUARD_PAGES 1 /* pages of kstack guard; 0 disables */
95 * Mach derived conversion macros
97 #define round_page(x) (((unsigned long)(x) + PAGE_MASK) & ~PAGE_MASK)
98 #define trunc_page(x) ((unsigned long)(x) & ~PAGE_MASK)
100 #define atop(x) ((unsigned long)(x) >> PAGE_SHIFT)
101 #define ptoa(x) ((unsigned long)(x) << PAGE_SHIFT)
103 #define riscv_btop(x) ((unsigned long)(x) >> PAGE_SHIFT)
104 #define riscv_ptob(x) ((unsigned long)(x) << PAGE_SHIFT)
106 #define pgtok(x) ((unsigned long)(x) * (PAGE_SIZE / 1024))
108 #endif /* !_MACHINE_PARAM_H_ */