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/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 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.
*/
#include <string.h>
#include <mach/boolean.h>
#include <mach/xen.h>
#include <kern/task.h>
#include <kern/thread.h>
#include <vm/vm_map.h>
#include "vm_param.h"
#include <mach/vm_prot.h>
#include <vm/vm_kern.h>
#include <vm/vm_page.h>
#include <i386/pmap.h>
#include <i386/model_dep.h>
#include <mach/machine/vm_param.h>
#define INTEL_PTE_W(p) (INTEL_PTE_VALID | INTEL_PTE_WRITE | INTEL_PTE_REF | INTEL_PTE_MOD | pa_to_pte(p))
#define INTEL_PTE_R(p) (INTEL_PTE_VALID | INTEL_PTE_REF | pa_to_pte(p))
/*
* pmap_zero_page zeros the specified (machine independent) page.
*/
void
pmap_zero_page(vm_offset_t p)
{
assert(p != vm_page_fictitious_addr);
vm_offset_t v;
pmap_mapwindow_t *map;
boolean_t mapped = p >= VM_PAGE_DIRECTMAP_LIMIT;
if (mapped)
{
map = pmap_get_mapwindow(INTEL_PTE_W(p));
v = map->vaddr;
}
else
v = phystokv(p);
memset((void*) v, 0, PAGE_SIZE);
if (mapped)
pmap_put_mapwindow(map);
}
/*
* pmap_copy_page copies the specified (machine independent) pages.
*/
void
pmap_copy_page(
vm_offset_t src,
vm_offset_t dst)
{
vm_offset_t src_addr_v, dst_addr_v;
pmap_mapwindow_t *src_map = NULL;
pmap_mapwindow_t *dst_map;
boolean_t src_mapped = src >= VM_PAGE_DIRECTMAP_LIMIT;
boolean_t dst_mapped = dst >= VM_PAGE_DIRECTMAP_LIMIT;
assert(src != vm_page_fictitious_addr);
assert(dst != vm_page_fictitious_addr);
if (src_mapped)
{
src_map = pmap_get_mapwindow(INTEL_PTE_R(src));
src_addr_v = src_map->vaddr;
}
else
src_addr_v = phystokv(src);
if (dst_mapped)
{
dst_map = pmap_get_mapwindow(INTEL_PTE_W(dst));
dst_addr_v = dst_map->vaddr;
}
else
dst_addr_v = phystokv(dst);
memcpy((void *) dst_addr_v, (void *) src_addr_v, PAGE_SIZE);
if (src_mapped)
pmap_put_mapwindow(src_map);
if (dst_mapped)
pmap_put_mapwindow(dst_map);
}
/*
* copy_to_phys(src_addr_v, dst_addr_p, count)
*
* Copy virtual memory to physical memory
*/
void
copy_to_phys(
vm_offset_t src_addr_v,
vm_offset_t dst_addr_p,
int count)
{
vm_offset_t dst_addr_v;
pmap_mapwindow_t *dst_map;
boolean_t mapped = dst_addr_p >= VM_PAGE_DIRECTMAP_LIMIT;
assert(dst_addr_p != vm_page_fictitious_addr);
assert(pa_to_pte(dst_addr_p + count-1) == pa_to_pte(dst_addr_p));
if (mapped)
{
dst_map = pmap_get_mapwindow(INTEL_PTE_W(dst_addr_p));
dst_addr_v = dst_map->vaddr;
}
else
dst_addr_v = phystokv(dst_addr_p);
memcpy((void *)dst_addr_v, (void *)src_addr_v, count);
if (mapped)
pmap_put_mapwindow(dst_map);
}
/*
* copy_from_phys(src_addr_p, dst_addr_v, count)
*
* Copy physical memory to virtual memory. The virtual memory
* is assumed to be present (e.g. the buffer pool).
*/
void
copy_from_phys(
vm_offset_t src_addr_p,
vm_offset_t dst_addr_v,
int count)
{
vm_offset_t src_addr_v;
pmap_mapwindow_t *src_map;
boolean_t mapped = src_addr_p >= VM_PAGE_DIRECTMAP_LIMIT;
assert(src_addr_p != vm_page_fictitious_addr);
assert(pa_to_pte(src_addr_p + count-1) == pa_to_pte(src_addr_p));
if (mapped)
{
src_map = pmap_get_mapwindow(INTEL_PTE_R(src_addr_p));
src_addr_v = src_map->vaddr;
}
else
src_addr_v = phystokv(src_addr_p);
memcpy((void *)dst_addr_v, (void *)src_addr_v, count);
if (mapped)
pmap_put_mapwindow(src_map);
}
/*
* kvtophys(addr)
*
* Convert a kernel virtual address to a physical address
*/
vm_offset_t
kvtophys(vm_offset_t addr)
{
pt_entry_t *pte;
if ((pte = pmap_pte(kernel_pmap, addr)) == PT_ENTRY_NULL)
return 0;
return pte_to_pa(*pte) | (addr & INTEL_OFFMASK);
}
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