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Added pmap_mapdev() function to map device memory.

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dg 1994-09-04 04:11:57 +00:00
parent e077351fdc
commit 4f4f361dff
2 changed files with 70 additions and 2 deletions
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36
sys/amd64/amd64/pmap.c
View File

@ -39,7 +39,7 @@
* SUCH DAMAGE.
*
* from: @(#)pmap.c 7.7 (Berkeley) 5/12/91
* $Id: pmap.c,v 1.33 1994/08/18 22:34:42 wollman Exp $
* $Id: pmap.c,v 1.34 1994/09/02 04:12:06 davidg Exp $
*/
/*
@ -1930,6 +1930,40 @@ i386_protection_init()
}
}
/*
* Map a set of physical memory pages into the kernel virtual
* address space. Return a pointer to where it is mapped. This
* routine is intended to be used for mapping device memory,
* NOT real memory. The non-cacheable bits are set on each
* mapped page.
*/
void *
pmap_mapdev(pa, size)
vm_offset_t pa;
vm_size_t size;
{
vm_offset_t va, tmpva;
pt_entry_t *pte;
pa = trunc_page(pa);
size = roundup(size, PAGE_SIZE);
va = kmem_alloc_pageable(kernel_map, size);
if (!va)
panic("pmap_mapdev: Couldn't alloc kernel virtual memory");
for (tmpva = va; size > 0;) {
pte = vtopte(tmpva);
*pte = (pt_entry_t) ((int) (pa | PG_RW | PG_V | PG_N));
size -= PAGE_SIZE;
tmpva += PAGE_SIZE;
pa += PAGE_SIZE;
}
pmap_update();
return ((void *)va);
}
#ifdef DEBUG
/* print address space of pmap*/
void

36
sys/i386/i386/pmap.c
View File

@ -39,7 +39,7 @@
* SUCH DAMAGE.
*
* from: @(#)pmap.c 7.7 (Berkeley) 5/12/91
* $Id: pmap.c,v 1.33 1994/08/18 22:34:42 wollman Exp $
* $Id: pmap.c,v 1.34 1994/09/02 04:12:06 davidg Exp $
*/
/*
@ -1930,6 +1930,40 @@ i386_protection_init()
}
}
/*
* Map a set of physical memory pages into the kernel virtual
* address space. Return a pointer to where it is mapped. This
* routine is intended to be used for mapping device memory,
* NOT real memory. The non-cacheable bits are set on each
* mapped page.
*/
void *
pmap_mapdev(pa, size)
vm_offset_t pa;
vm_size_t size;
{
vm_offset_t va, tmpva;
pt_entry_t *pte;
pa = trunc_page(pa);
size = roundup(size, PAGE_SIZE);
va = kmem_alloc_pageable(kernel_map, size);
if (!va)
panic("pmap_mapdev: Couldn't alloc kernel virtual memory");
for (tmpva = va; size > 0;) {
pte = vtopte(tmpva);
*pte = (pt_entry_t) ((int) (pa | PG_RW | PG_V | PG_N));
size -= PAGE_SIZE;
tmpva += PAGE_SIZE;
pa += PAGE_SIZE;
}
pmap_update();
return ((void *)va);
}
#ifdef DEBUG
/* print address space of pmap*/
void