/*
* Copyright (c) 2006 Jakub Jermar
* Copyright (c) 2006 Jakub Vana
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - 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.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/** @addtogroup kernel_ia64_mm
* @{
*/
/** @file
*/
#include <arch/mm/page.h>
#include <assert.h>
#include <genarch/mm/page_ht.h>
#include <mm/asid.h>
#include <arch/mm/asid.h>
#include <arch/mm/vhpt.h>
#include <typedefs.h>
#include <mm/page.h>
#include <mm/frame.h>
#include <config.h>
#include <panic.h>
#include <arch/asm.h>
#include <barrier.h>
#include <align.h>
static void set_environment(void);
/** Initialize ia64 virtual address translation subsystem. */
void page_arch_init(void)
{
page_mapping_operations = &ht_mapping_operations;
pk_disable();
set_environment();
}
/** Initialize VHPT and region registers. */
void set_environment(void)
{
region_register_t rr;
pta_register_t pta;
int i;
#ifdef CONFIG_VHPT
uintptr_t vhpt_base;
#endif
/*
* Set up kernel region registers.
* VRN_KERNEL has already been set in start.S.
* For paranoia reasons, we set it again.
*/
for (i = 0; i < REGION_REGISTERS; i++) {
rr.word = rr_read(i);
rr.map.ve = 0; /* disable VHPT walker */
rr.map.rid = ASID2RID(ASID_KERNEL, i);
rr.map.ps = PAGE_WIDTH;
rr_write(i, rr.word);
srlz_i();
srlz_d();
}
#ifdef CONFIG_VHPT
vhpt_base = vhpt_set_up();
#endif
/*
* Set up PTA register.
*/
pta.word = pta_read();
#ifndef CONFIG_VHPT
pta.map.ve = 0; /* disable VHPT walker */
pta.map.base = 0 >> PTA_BASE_SHIFT;
#else
pta.map.ve = 1; /* enable VHPT walker */
pta.map.base = vhpt_base >> PTA_BASE_SHIFT;
#endif
pta.map.vf = 1; /* large entry format */
pta.map.size = VHPT_WIDTH;
pta_write(pta.word);
srlz_i();
srlz_d();
}
/** Calculate address of collision chain from VPN and ASID.
*
* Interrupts must be disabled.
*
* @param page Address of virtual page including VRN bits.
* @param asid Address space identifier.
*
* @return VHPT entry address.
*/
vhpt_entry_t *vhpt_hash(uintptr_t page, asid_t asid)
{
region_register_t rr_save, rr;
size_t vrn;
rid_t rid;
vhpt_entry_t *v;
vrn = page >> VRN_SHIFT;
rid = ASID2RID(asid, vrn);
rr_save.word = rr_read(vrn);
if (rr_save.map.rid == rid) {
/*
* The RID is already in place, compute thash and return.
*/
v = (vhpt_entry_t *) thash(page);
return v;
}
/*
* The RID must be written to some region register.
* To speed things up, register indexed by vrn is used.
*/
rr.word = rr_save.word;
rr.map.rid = rid;
rr_write(vrn, rr.word);
srlz_i();
v = (vhpt_entry_t *) thash(page);
rr_write(vrn, rr_save.word);
srlz_i();
srlz_d();
return v;
}
/** Compare ASID and VPN against PTE.
*
* Interrupts must be disabled.
*
* @param page Address of virtual page including VRN bits.
* @param asid Address space identifier.
*
* @return True if page and asid match the page and asid of t,
* false otherwise.
*/
bool vhpt_compare(uintptr_t page, asid_t asid, vhpt_entry_t *v)
{
region_register_t rr_save, rr;
size_t vrn;
rid_t rid;
bool match;
assert(v);
vrn = page >> VRN_SHIFT;
rid = ASID2RID(asid, vrn);
rr_save.word = rr_read(vrn);
if (rr_save.map.rid == rid) {
/*
* The RID is already in place, compare ttag with t and return.
*/
return ttag(page) == v->present.tag.tag_word;
}
/*
* The RID must be written to some region register.
* To speed things up, register indexed by vrn is used.
*/
rr.word = rr_save.word;
rr.map.rid = rid;
rr_write(vrn, rr.word);
srlz_i();
match = (ttag(page) == v->present.tag.tag_word);
rr_write(vrn, rr_save.word);
srlz_i();
srlz_d();
return match;
}
/** Set up one VHPT entry.
*
* @param v VHPT entry to be set up.
* @param page Virtual address of the page mapped by the entry.
* @param asid Address space identifier of the address space to which
* page belongs.
* @param frame Physical address of the frame to wich page is mapped.
* @param flags Different flags for the mapping.
*/
void
vhpt_set_record(vhpt_entry_t *v, uintptr_t page, asid_t asid, uintptr_t frame,
int flags)
{
region_register_t rr_save, rr;
size_t vrn;
rid_t rid;
uint64_t tag;
assert(v);
vrn = page >> VRN_SHIFT;
rid = ASID2RID(asid, vrn);
/*
* Compute ttag.
*/
rr_save.word = rr_read(vrn);
rr.word = rr_save.word;
rr.map.rid = rid;
rr_write(vrn, rr.word);
srlz_i();
tag = ttag(page);
rr_write(vrn, rr_save.word);
srlz_i();
srlz_d();
/*
* Clear the entry.
*/
v->word[0] = 0;
v->word[1] = 0;
v->word[2] = 0;
v->word[3] = 0;
v->present.p = true;
v->present.ma = (flags & PAGE_CACHEABLE) ?
MA_WRITEBACK : MA_UNCACHEABLE;
v->present.a = false; /* not accessed */
v->present.d = false; /* not dirty */
v->present.pl = (flags & PAGE_USER) ? PL_USER : PL_KERNEL;
v->present.ar = (flags & PAGE_WRITE) ? AR_WRITE : AR_READ;
v->present.ar |= (flags & PAGE_EXEC) ? AR_EXECUTE : 0;
v->present.ppn = frame >> PPN_SHIFT;
v->present.ed = false; /* exception not deffered */
v->present.ps = PAGE_WIDTH;
v->present.key = 0;
v->present.tag.tag_word = tag;
}
/** @}
*/