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NetBSD/sys/arch/alpha/include/pmap.h

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/* $NetBSD: pmap.h,v 1.7 1996/07/02 22:51:55 cgd Exp $ */
/*
* Copyright (c) 1992, 1993, 1996 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* File: pmap.h
*
* Author: David Golub (mods for Alpha by Alessandro Forin)
Mods for use in NetBSD/Alpha by Chris Demetriou.
* Date: 1988 ca.
*
* Machine-dependent structures for the physical map module.
*/
#ifdef OLD_PMAP
#include <machine/pmap.old.h>
#else
#ifndef _PMAP_MACHINE_
#define _PMAP_MACHINE_ 1
#ifndef ASSEMBLER
#include <kern/zalloc.h>
#include <kern/lock.h>
#include <mach/machine/vm_param.h>
#include <mach/vm_statistics.h>
#include <mach/kern_return.h>
/*
* Alpha Page Table Entry
*/
typedef unsigned long pt_entry_t;
#define PT_ENTRY_NULL ((pt_entry_t *) 0)
#endif ASSEMBLER
#define ALPHA_OFFMASK (ALPHA_PGBYTES-1) /* offset within page */
#define SEG_MASK ((ALPHA_PGBYTES / 8)-1) /* masks for segments */
#define SEG3_SHIFT (ALPHA_PGSHIFT) /* shifts for segments */
#define SEG2_SHIFT (SEG3_SHIFT+(ALPHA_PGSHIFT-3))
#define SEG1_SHIFT (SEG2_SHIFT+(ALPHA_PGSHIFT-3))
/*
* Convert address offset to page descriptor index
*/
#define pdenum(a) (((a) >> SEG1_SHIFT) & SEG_MASK)
/*
* Convert page descriptor index to user virtual address
*/
#define pdetova(a) ((vm_offset_t)(a) << SEG1_SHIFT)
#define pde2tova(a) ((vm_offset_t)(a) << SEG2_SHIFT)
#define pde3tova(a) ((vm_offset_t)(a) << SEG3_SHIFT)
/*
* Convert address offset to second level page table index
*/
#define pte2num(a) (((a) >> SEG2_SHIFT) & SEG_MASK)
/*
* Convert address offset to third level page table index
*/
#define pte3num(a) (((a) >> SEG3_SHIFT) & SEG_MASK)
#define NPTES (alpha_ptob(1)/sizeof(pt_entry_t))
#define NPDES (alpha_ptob(1)/sizeof(pt_entry_t))
/*
* Hardware pte bit definitions (to be used directly on the ptes
* without using the bit fields).
*/
#define ALPHA_PTE_VALID 0x1
#define ALPHA_PTE_FAULT_ON_x 0xe
#define ALPHA_PTE_GLOBAL 0x10
#define ALPHA_PTE_GRANULARITY 0x60
#define ALPHA_PTE_PROT 0xff00
#define ALPHA_PTE_PROTOFF 8
#define ALPHA_PTE_KW 0x10
#define ALPHA_PTE_UW 0x80
#define ALPHA_PTE_KR 0x01
#define ALPHA_PTE_UR 0x08
#define ALPHA_PTE_WRITE 0x00009000
#define ALPHA_PTE_SOFTWARE 0xffff0000
#define ALPHA_PTE_WIRED 0x00010000
#define ALPHA_PTE_REF 0x00020000
#define ALPHA_PTE_MOD 0x00040000
#define ALPHA_PTE_PFN 0xffffffff00000000
#define pa_to_pte(a) (alpha_btop(a) << 32)
#define pte_to_pa(p) (alpha_ptob( (p) >> 32 ))
#define pte_increment_pa(p) ((p) += pa_to_pte(ALPHA_PGBYTES))
/*
* Convert page table entry to kernel virtual address
*/
#define ptetokv(a) (phystokv(pte_to_pa(a)))
#ifndef ASSEMBLER
typedef volatile long cpu_set; /* set of CPUs - must be <= 64 */
/* changed by other processors */
struct pmap {
pt_entry_t *dirbase; /* page directory pointer register */
int pid; /* TLBPID when in use */
int ref_count; /* reference count */
decl_simple_lock_data(,lock)
/* lock on map */
struct pmap_statistics stats; /* map statistics */
cpu_set cpus_using; /* bitmap of cpus using pmap */
int (*hacking)(); /* horrible things needed */
};
typedef struct pmap *pmap_t;
#define PMAP_NULL ((pmap_t) 0)
extern vm_offset_t kvtophys(vm_offset_t);
extern void set_ptbr(/* pmap_t map, pcb_t pcb */);
#if NCPUS > 1
/*
* List of cpus that are actively using mapped memory. Any
* pmap update operation must wait for all cpus in this list.
* Update operations must still be queued to cpus not in this
* list.
*/
extern cpu_set cpus_active;
/*
* List of cpus that are idle, but still operating, and will want
* to see any kernel pmap updates when they become active.
*/
extern cpu_set cpus_idle;
/*
* Quick test for pmap update requests.
*/
extern volatile
boolean_t cpu_update_needed[NCPUS];
/*
* External declarations for PMAP_ACTIVATE.
*/
void process_pmap_updates();
void pmap_update_interrupt();
extern pmap_t kernel_pmap;
#endif NCPUS > 1
/*
* Machine dependent routines that are used only for Alpha.
*/
pt_entry_t *pmap_pte();
/*
* Macros for speed.
*/
#if NCPUS > 1
/*
* For multiple CPUS, PMAP_ACTIVATE and PMAP_DEACTIVATE must manage
* fields to control TLB invalidation on other CPUS.
*/
#define PMAP_ACTIVATE_KERNEL(my_cpu) { \
\
/* \
* Let pmap updates proceed while we wait for this pmap. \
*/ \
i_bit_clear((my_cpu), &cpus_active); \
\
/* \
* Lock the pmap to put this cpu in its active set. \
* Wait for updates here. \
*/ \
simple_lock(&kernel_pmap->lock); \
\
/* \
* Process invalidate requests for the kernel pmap. \
*/ \
if (cpu_update_needed[(my_cpu)]) \
process_pmap_updates(kernel_pmap); \
\
/* \
* Mark that this cpu is using the pmap. \
*/ \
i_bit_set((my_cpu), &kernel_pmap->cpus_using); \
\
/* \
* Mark this cpu active - IPL will be lowered by \
* load_context(). \
*/ \
i_bit_set((my_cpu), &cpus_active); \
\
simple_unlock(&kernel_pmap->lock); \
}
#define PMAP_DEACTIVATE_KERNEL(my_cpu) { \
/* \
* Mark pmap no longer in use by this cpu even if \
* pmap is locked against updates. \
*/ \
i_bit_clear((my_cpu), &kernel_pmap->cpus_using); \
}
#define PMAP_ACTIVATE_USER(pmap, th, my_cpu) { \
register pmap_t tpmap = (pmap); \
register pcb_t pcb = (th)->pcb; \
\
if (tpmap == kernel_pmap) { \
/* \
* If this is the kernel pmap, switch to its page tables. \
*/ \
set_ptbr(tpmap,pcb,TRUE); \
} \
else { \
/* \
* Let pmap updates proceed while we wait for this pmap. \
*/ \
i_bit_clear((my_cpu), &cpus_active); \
\
/* \
* Lock the pmap to put this cpu in its active set. \
* Wait for updates here. \
*/ \
simple_lock(&tpmap->lock); \
\
/* \
* No need to invalidate the TLB - the entire user pmap \
* will be invalidated by reloading dirbase. \
*/ \
if (tpmap->pid < 0) pmap_assign_tlbpid(tpmap); \
set_ptbr(tpmap, pcb, TRUE); \
\
/* \
* Mark that this cpu is using the pmap. \
*/ \
i_bit_set((my_cpu), &tpmap->cpus_using); \
\
/* \
* Mark this cpu active - IPL will be lowered by \
* load_context(). \
*/ \
i_bit_set((my_cpu), &cpus_active); \
\
simple_unlock(&tpmap->lock); \
} \
}
#define PMAP_DEACTIVATE_USER(pmap, thread, my_cpu) { \
register pmap_t tpmap = (pmap); \
\
/* \
* Do nothing if this is the kernel pmap. \
*/ \
if (tpmap != kernel_pmap) { \
/* \
* Mark pmap no longer in use by this cpu even if \
* pmap is locked against updates. \
*/ \
i_bit_clear((my_cpu), &(pmap)->cpus_using); \
} \
}
#define MARK_CPU_IDLE(my_cpu) { \
/* \
* Mark this cpu idle, and remove it from the active set, \
* since it is not actively using any pmap. Signal_cpus \
* will notice that it is idle, and avoid signaling it, \
* but will queue the update request for when the cpu \
* becomes active. \
*/ \
spl_t s = splvm(); \
i_bit_set((my_cpu), &cpus_idle); \
i_bit_clear((my_cpu), &cpus_active); \
splx(s); \
}
#define MARK_CPU_ACTIVE(my_cpu) { \
\
spl_t s = splvm(); \
/* \
* If a kernel_pmap update was requested while this cpu \
* was idle, process it as if we got the interrupt. \
* Before doing so, remove this cpu from the idle set. \
* Since we do not grab any pmap locks while we flush \
* our TLB, another cpu may start an update operation \
* before we finish. Removing this cpu from the idle \
* set assures that we will receive another update \
* interrupt if this happens. \
*/ \
i_bit_clear((my_cpu), &cpus_idle); \
\
if (cpu_update_needed[(my_cpu)]) \
pmap_update_interrupt(); \
\
/* \
* Mark that this cpu is now active. \
*/ \
i_bit_set((my_cpu), &cpus_active); \
splx(s); \
}
#else NCPUS > 1
/*
* With only one CPU, we just have to indicate whether the pmap is
* in use.
*/
#define PMAP_ACTIVATE_KERNEL(my_cpu) { \
kernel_pmap->cpus_using = TRUE; \
}
#define PMAP_DEACTIVATE_KERNEL(my_cpu) { \
kernel_pmap->cpus_using = FALSE; \
}
#define PMAP_ACTIVATE_USER(pmap, th, my_cpu) { \
register pmap_t tpmap = (pmap); \
register pcb_t pcb = (th)->pcb; \
\
if (tpmap->pid < 0) pmap_assign_tlbpid(tpmap); \
set_ptbr(tpmap,pcb,TRUE); \
if (tpmap != kernel_pmap) { \
tpmap->cpus_using = TRUE; \
} \
}
#define PMAP_DEACTIVATE_USER(pmap, thread, cpu) { \
if ((pmap) != kernel_pmap) \
(pmap)->cpus_using = FALSE; \
}
#endif NCPUS > 1
#define pmap_kernel() (kernel_pmap)
#define pmap_resident_count(pmap) ((pmap)->stats.resident_count)
#define pmap_phys_address(frame) ((vm_offset_t) (alpha_ptob(frame)))
#define pmap_phys_to_frame(phys) ((alpha_btop(phys)))
#define pmap_copy(dst_pmap,src_pmap,dst_addr,len,src_addr)
#define pmap_attribute(pmap,addr,size,attr,value) \
(KERN_INVALID_ADDRESS)
/*
* Data structures this module exports
*/
extern pmap_t kernel_pmap; /* pointer to the kernel pmap */
#endif ASSEMBLER
/*
* We want to implement pmap_steal_memory and pmap_startup.
*/
#define MACHINE_PAGES
#endif _PMAP_MACHINE_
#endif /* OLD_PMAP */
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