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freebsd-dev/sys/alpha/include/pmap.h
jhb 1161317a98 Fixes for alpha pmap on SMP machines: 
- Create a private list of active pmaps rather than abusing the list of all
  processes when we need to look up pmaps.  The process list needs a sx lock
  and we can't be getting sx locks in the middle of cpu_switch()
  (pmap_activate() can call pmap_get_asn() from cpu_switch()).  Instead, we
  protect the list with a spinlock.  This also means the list is shorter
  since a pmap can be used by more than one process and we could (at least
  in thoery) dink with pmap's more than once, but now we only touch each
  pmap once when we have to update all of them.
- Wrap pmap_activate()'s code to get a new ASN in an explicit critical section
  so that when it is called while doing an exec() we can't get preempted.
- Replace splhigh() in pmap_growkernel() with a critical section to prevent
  preemption while we are adjusting the kernel page tables.
- Fixes abuse of PCPU_GET(), which doesn't return an L-value.
- Also adds some slight cleanups to the ASN handling by adding some macros
  instead of magic numbers in relation to the ASN and ASN generations.

Reviewed by:	dfr
2002-02-06 04:30:26 +00:00

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/*
* Copyright (c) 1991 Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department and William Jolitz of UUNET Technologies Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Derived from hp300 version by Mike Hibler, this version by William
* Jolitz uses a recursive map [a pde points to the page directory] to
* map the page tables using the pagetables themselves. This is done to
* reduce the impact on kernel virtual memory for lots of sparse address
* space, and to reduce the cost of memory to each process.
*
* from: hp300: @(#)pmap.h 7.2 (Berkeley) 12/16/90
* from: @(#)pmap.h 7.4 (Berkeley) 5/12/91
* from: i386 pmap.h,v 1.54 1997/11/20 19:30:35 bde Exp
* $FreeBSD$
*/
#ifndef _MACHINE_PMAP_H_
#define _MACHINE_PMAP_H_
/*
* Define meanings for a few software bits in the pte
*/
#define PG_V ALPHA_PTE_VALID
#define PG_FOR ALPHA_PTE_FAULT_ON_READ
#define PG_FOW ALPHA_PTE_FAULT_ON_WRITE
#define PG_FOE ALPHA_PTE_FAULT_ON_EXECUTE
#define PG_ASM ALPHA_PTE_ASM
#define PG_GH ALPHA_PTE_GRANULARITY
#define PG_KRE ALPHA_PTE_KR
#define PG_URE ALPHA_PTE_UR
#define PG_KWE ALPHA_PTE_KW
#define PG_UWE ALPHA_PTE_UW
#define PG_PROT ALPHA_PTE_PROT
#define PG_SHIFT 32
#define PG_W 0x00010000 /* software wired */
#define PG_MANAGED 0x00020000 /* software managed */
/*
* Pte related macros
*/
#define VADDR(l1, l2, l3) (((l1) << ALPHA_L1SHIFT) \
+ ((l2) << ALPHA_L2SHIFT) \
+ ((l3) << ALPHA_L3SHIFT)
#ifndef NKPT
#define NKPT 9 /* initial number of kernel page tables */
#endif
#define NKLEV2MAPS 255 /* max number of lev2 page tables */
#define NKLEV3MAPS (NKLEV2MAPS << ALPHA_PTSHIFT) /* max number of lev3 page tables */
/*
* The *PTDI values control the layout of virtual memory
*
* XXX This works for now, but I am not real happy with it, I'll fix it
* right after I fix locore.s and the magic 28K hole
*
* SMP_PRIVPAGES: The per-cpu address space is 0xff80000 -> 0xffbfffff
*/
#define PTLEV1I (NPTEPG-1) /* Lev0 entry that points to Lev0 */
#define K0SEGLEV1I (NPTEPG/2)
#define K1SEGLEV1I (K0SEGLEV1I+(NPTEPG/4))
#define NUSERLEV2MAPS (NPTEPG/2)
#define NUSERLEV3MAPS (NUSERLEV2MAPS << ALPHA_PTSHIFT)
#ifndef LOCORE
#include <sys/queue.h>
typedef alpha_pt_entry_t pt_entry_t;
#define PTESIZE sizeof(pt_entry_t) /* for assembly files */
/*
* Address of current address space page table maps
*/
#ifdef _KERNEL
extern pt_entry_t PTmap[]; /* lev3 page tables */
extern pt_entry_t PTlev2[]; /* lev2 page tables */
extern pt_entry_t PTlev1[]; /* lev1 page table */
extern pt_entry_t PTlev1pte; /* pte that maps lev1 page table */
#endif
#ifdef _KERNEL
/*
* virtual address to page table entry and
* to physical address.
* Note: this work recursively, thus vtopte of a pte will give
* the corresponding lev1 that in turn maps it.
*/
#define vtopte(va) (PTmap + (alpha_btop(va) \
& ((1 << 3*ALPHA_PTSHIFT)-1)))
/*
* Routine: pmap_kextract
* Function:
* Extract the physical page address associated
* kernel virtual address.
*/
static __inline vm_offset_t
pmap_kextract(vm_offset_t va)
{
vm_offset_t pa;
if (va >= ALPHA_K0SEG_BASE && va <= ALPHA_K0SEG_END)
pa = ALPHA_K0SEG_TO_PHYS(va);
else
pa = alpha_ptob(ALPHA_PTE_TO_PFN(*vtopte(va)))
| (va & PAGE_MASK);
return pa;
}
#define vtophys(va) pmap_kextract(((vm_offset_t) (va)))
extern vm_offset_t alpha_XXX_dmamap_or;
static __inline vm_offset_t
alpha_XXX_dmamap(vm_offset_t va)
{
return (pmap_kextract(va) | alpha_XXX_dmamap_or);
}
#endif /* _KERNEL */
/*
* Pmap stuff
*/
struct pv_entry;
struct md_page {
int pv_list_count;
int pv_flags;
TAILQ_HEAD(,pv_entry) pv_list;
};
#define ASN_BITS 8
#define ASNGEN_BITS (32 - ASN_BITS)
#define ASNGEN_MASK ((1 << ASNGEN_BITS) - 1)
struct pmap {
pt_entry_t *pm_lev1; /* KVA of lev0map */
vm_object_t pm_pteobj; /* Container for pte's */
TAILQ_HEAD(,pv_entry) pm_pvlist; /* list of mappings in pmap */
int pm_count; /* reference count */
u_int32_t pm_active; /* active cpus */
struct {
u_int32_t asn:ASN_BITS; /* address space number */
u_int32_t gen:ASNGEN_BITS; /* generation number */
} pm_asn[MAXCPU];
struct pmap_statistics pm_stats; /* pmap statistics */
struct vm_page *pm_ptphint; /* pmap ptp hint */
LIST_ENTRY(pmap) pm_list; /* list of all pmaps. */
};
#define pmap_resident_count(pmap) (pmap)->pm_stats.resident_count
#define PM_FLAG_LOCKED 0x1
#define PM_FLAG_WANTED 0x2
typedef struct pmap *pmap_t;
#ifdef _KERNEL
extern pmap_t kernel_pmap;
#endif
/*
* For each vm_page_t, there is a list of all currently valid virtual
* mappings of that page. An entry is a pv_entry_t, the list is pv_table.
*/
typedef struct pv_entry {
pmap_t pv_pmap; /* pmap where mapping lies */
vm_offset_t pv_va; /* virtual address for mapping */
TAILQ_ENTRY(pv_entry) pv_list;
TAILQ_ENTRY(pv_entry) pv_plist;
vm_page_t pv_ptem; /* VM page for pte */
} *pv_entry_t;
#define PV_ENTRY_NULL ((pv_entry_t) 0)
#define PV_CI 0x01 /* all entries must be cache inhibited */
#define PV_PTPAGE 0x02 /* entry maps a page table page */
#ifdef _KERNEL
extern caddr_t CADDR1;
extern pt_entry_t *CMAP1;
extern vm_offset_t avail_end;
extern vm_offset_t avail_start;
extern vm_offset_t clean_eva;
extern vm_offset_t clean_sva;
extern vm_offset_t phys_avail[];
extern char *ptvmmap; /* poor name! */
extern vm_offset_t virtual_avail;
extern vm_offset_t virtual_end;
struct vmspace;
vm_offset_t pmap_steal_memory __P((vm_size_t));
void pmap_bootstrap __P((vm_offset_t, u_int));
void pmap_setdevram __P((unsigned long long basea, vm_offset_t sizea));
int pmap_uses_prom_console __P((void));
pmap_t pmap_kernel __P((void));
void *pmap_mapdev __P((vm_offset_t, vm_size_t));
void pmap_unmapdev __P((vm_offset_t, vm_size_t));
unsigned *pmap_pte __P((pmap_t, vm_offset_t)) __pure2;
vm_page_t pmap_use_pt __P((pmap_t, vm_offset_t));
void pmap_set_opt __P((unsigned *));
void pmap_set_opt_bsp __P((void));
void pmap_deactivate __P((struct thread *td));
void pmap_emulate_reference __P((struct vmspace *vm, vm_offset_t v, int user, int write));
#endif /* _KERNEL */
#endif /* !LOCORE */
#endif /* !_MACHINE_PMAP_H_ */
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