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vmparam.h revision 1.16.2.2 
      1 /*	$NetBSD: vmparam.h,v 1.16.2.2 2011/06/23 14:19:31 cherry 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 #include "opt_uvm.h"
     10 #endif
     11 
     12 /*
     13  * These are common for BOOKE, IBM4XX, and OEA
     14  */
     15 #define	VM_FREELIST_DEFAULT	0
     16 #define	VM_FREELIST_FIRST256	1
     17 #define	VM_FREELIST_FIRST16	2
     18 #define	VM_NFREELIST		3
     19 
     20 #define	VM_PHYSSEG_MAX		16
     21 
     22 /*
     23  * The address to which unspecified mapping requests default
     24  * Put the stack in it's own segment and start mmaping at the
     25  * top of the next lower segment.
     26  */
     27 #define	__USE_TOPDOWN_VM
     28 #define	VM_DEFAULT_ADDRESS(da, sz) \
     29 	((VM_MAXUSER_ADDRESS - MAXSSIZ) - round_page(sz))
     30 
     31 #if defined(_MODULE)
     32 /*
     33  * If we are a module, then we need with varible page sizes since BOOKE and OEA
     34  * use 4KB pages while IBM4XX use 16KB pages.
     35  */
     36 #define	MIN_PAGE_SIZE	4096		/* BOOKE/OEA */
     37 #define	MAX_PAGE_SIZE	16384		/* IBM4XX */
     38 
     39 #if defined(_RUMPKERNEL)
     40 /*
     41  * Safe definitions for RUMP kernels
     42  */
     43 #define	VM_MAXUSER_ADDRESS	0x7fff8000
     44 #define	VM_MIN_ADDRESS		0x00000000
     45 #define	VM_MAX_ADDRESS		VM_MAXUSER_ADDRESS
     46 #define	MAXDSIZ			(1024*1024*1024)
     47 #define	MAXSSIZ			(32*1024*1024)
     48 #define	MAXTSIZ			(256*1024*1024)
     49 #else /* !_RUMPKERNEL */
     50 /*
     51  * Some modules need some of the constants but those vary between the variants
     52  * so those constants are exported as linker symbols so they don't take up any
     53  * space but also avoid an extra load to put into a register.
     54  */
     55 extern const char __USRSTACK;		/* let the linker resolve it */
     56 
     57 #define USRSTACK	((vaddr_t)(uintptr_t)&__USRSTACK)
     58 #endif /* !_RUMPKERNEL */
     59 
     60 #else /* !_MODULE */
     61 
     62 #if defined(PPC_BOOKE)
     63 #include <powerpc/booke/vmparam.h>
     64 #elif defined(PPC_IBM4XX)
     65 #include <powerpc/ibm4xx/vmparam.h>
     66 #elif defined(PPC_OEA) || defined (PPC_OEA64) || defined (PPC_OEA64_BRIDGE)
     67 #include <powerpc/oea/vmparam.h>
     68 #elif defined(_KERNEL)
     69 #error unknown PPC variant
     70 #endif
     71 
     72 #endif /* !_MODULE */
     73 
     74 #if defined(MODULAR) || defined(_MODULAR)
     75 /*
     76  * If we are a module or support modules, we need to define a compatible
     77  * pmap_physseg since IBM4XX uses one.  This will waste a tiny of space
     78  * but is needed for compatibility.
     79  */
     80 #ifndef __HAVE_PMAP_PHYSSEG
     81 #define	__HAVE_PMAP_PHYSSEG
     82 struct pmap_physseg {
     83 	uintptr_t pmseg_dummy[2];
     84 };
     85 #endif
     86 
     87 __CTASSERT(sizeof(struct pmap_physseg) == sizeof(uintptr_t) * 2);
     88 #endif /* MODULAR || _MODULE */
     89 
     90 #endif /* !_POWERPC_VMPARAM_H_ */
     91