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vmparam.h revision 1.15 
      1 /*	$NetBSD: vmparam.h,v 1.15 2011/06/20 20:24:28 matt 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 /*
     40  * Some modules need some of the constants but those vary between the variants
     41  * so those constants are exported as linker symbols so they don't take up any
     42  * space but also avoid an extra load to put into a register.
     43  */
     44 extern const char __USRSTACK;		/* let the linker resolve it */
     45 
     46 #define USRSTACK	((vaddr_t)(uintptr_t)&__USRSTACK)
     47 
     48 #else /* !_MODULE */
     49 
     50 #if defined(PPC_BOOKE)
     51 #include <powerpc/booke/vmparam.h>
     52 #elif defined(PPC_IBM4XX)
     53 #include <powerpc/ibm4xx/vmparam.h>
     54 #elif defined(PPC_OEA) || defined (PPC_OEA64) || defined (PPC_OEA64_BRIDGE)
     55 #include <powerpc/oea/vmparam.h>
     56 #else
     57 #error unknown PPC variant
     58 #endif
     59 
     60 #endif /* !_MODULE */
     61 
     62 #if defined(MODULAR) || defined(_MODULAR)
     63 /*
     64  * If we are a module or support modules, we need to define a compatible
     65  * pmap_physseg since IBM4XX uses one.  This will waste a tiny of space
     66  * but is needed for compatibility.
     67  */
     68 #ifndef __HAVE_PMAP_PHYSSEG
     69 #define	__HAVE_PMAP_PHYSSEG
     70 struct pmap_physseg {
     71 	uintptr_t pmseg_dummy[2];
     72 };
     73 #endif
     74 
     75 __CTASSERT(sizeof(struct pmap_physseg) == sizeof(uintptr_t) * 2);
     76 #endif /* MODULAR || _MODULE */
     77 
     78 #endif /* !_POWERPC_VMPARAM_H_ */
     79