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      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  */
     60 extern 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
     87 struct 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_ */
     96