1/* $NetBSD: vmparam.h,v 1.27 2023/12/15 09:42:33 rin Exp $ */
2
3#ifndef _POWERPC_VMPARAM_H_
4#define _POWERPC_VMPARAM_H_
5
6#ifdef _KERNEL_OPT
7#include "opt_modular.h"
8#include "opt_ppcarch.h"
9#endif
10
11/*
12 * These are common for BOOKE, IBM4XX, and OEA
13 */
14#define VM_FREELIST_DEFAULT 0
15#define VM_FREELIST_DIRECT_MAPPED 1
16#define VM_FREELIST_FIRST16 2
17#define VM_NFREELIST 3
18
19#define VM_PHYSSEG_MAX 16
20
21/*
22 * The address to which unspecified mapping requests default
23 * Put the stack in its own segment and start mmaping at the
24 * top of the next lower segment.
25 */
26#define __USE_TOPDOWN_VM
27#define VM_DEFAULT_ADDRESS_BOTTOMUP(da, sz) \
28 round_page((vaddr_t)(da) + (vsize_t)maxdmap)
29
30#if defined(MODULAR) || defined(_MODULE) || !defined(_KERNEL)
31/*
32 * If we are a module or a modular kernel, then we need to defined the range
33 * of our variable page sizes since BOOKE and OEA use 4KB pages while IBM4XX
34 * use 16KB pages.
35 * This is also required for userland by jemalloc.
36 */
37#define MIN_PAGE_SHIFT 12 /* BOOKE/OEA */
38#define MAX_PAGE_SHIFT 14 /* IBM4XX */
39#define MIN_PAGE_SIZE (1 << MIN_PAGE_SHIFT)
40#define MAX_PAGE_SIZE (1 << MAX_PAGE_SHIFT)
41#endif /* MODULAR || _MODULE || !_KERNEL */
42
43#if defined(_MODULE)
44#if defined(_RUMPKERNEL)
45/*
46 * Safe definitions for RUMP kernels
47 */
48#define VM_MAXUSER_ADDRESS 0x7fff8000
49#define VM_MIN_ADDRESS 0x00000000
50#define VM_MAX_ADDRESS VM_MAXUSER_ADDRESS
51#define MAXDSIZ (1024*1024*1024)
52#define MAXSSIZ (32*1024*1024)
53#define MAXTSIZ (256*1024*1024)
54#else /* !_RUMPKERNEL */
55/*
56 * Some modules need some of the constants but those vary between the variants
57 * so those constants are exported as linker symbols so they don't take up any
58 * space but also avoid an extra load to put into a register.
59 */
60extern const char __USRSTACK; /* let the linker resolve it */
61
62#define USRSTACK ((vaddr_t)(uintptr_t)&__USRSTACK)
63#endif /* !_RUMPKERNEL */
64
65#else /* !_MODULE */
66
67#if defined(PPC_BOOKE)
68#include <powerpc/booke/vmparam.h>
69#elif defined(PPC_IBM4XX)
70#include <powerpc/ibm4xx/vmparam.h>
71#elif defined(PPC_OEA) || defined (PPC_OEA64) || defined (PPC_OEA64_BRIDGE)
72#include <powerpc/oea/vmparam.h>
73#elif defined(_KERNEL)
74#error unknown PPC variant
75#endif
76
77#endif /* !_MODULE */
78
79#if defined(MODULAR) || defined(_MODULE)
80/*
81 * If we are a module or support modules, we need to define a compatible
82 * pmap_physseg since IBM4XX uses one. This will waste a tiny of space
83 * but is needed for compatibility.
84 */
85#ifndef __HAVE_PMAP_PHYSSEG
86#define __HAVE_PMAP_PHYSSEG
87struct pmap_physseg {
88 uintptr_t pmseg_dummy[2];
89};
90#endif
91
92__CTASSERT(sizeof(struct pmap_physseg) == sizeof(uintptr_t) * 2);
93#endif /* MODULAR || _MODULE */
94
95#endif /* !_POWERPC_VMPARAM_H_ */