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implement bus_mem_map() and bus_mem_unmap() functions.

This commit is contained in:
cgd 1996-03-08 20:19:48 +00:00
parent 0b56afadf3
commit 91d7642d30
1 changed files with 45 additions and 1 deletions
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46
sys/arch/i386/i386/machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.193 1996/03/08 11:40:28 mycroft Exp $ */
/* $NetBSD: machdep.c,v 1.194 1996/03/08 20:19:48 cgd Exp $ */
/*-
* Copyright (c) 1993, 1994, 1995 Charles M. Hannum. All rights reserved.
@ -1420,3 +1420,47 @@ cpu_reset()
for (;;);
}
int
bus_mem_map(t, bpa, size, cacheable, mhp)
bus_chipset_tag_t t;
bus_mem_addr_t bpa;
bus_mem_size_t size;
int cacheable;
bus_mem_handle_t *mhp;
{
u_long pa, endpa;
vm_offset_t va;
pa = i386_trunc_page(bpa);
endpa = i386_round_page(bpa + size);
va = kmem_alloc_pageable(kernel_map, endpa - pa);
if (va == 0)
return (1);
*mhp = (caddr_t)(va + (bpa & PGOFSET));
for (; pa < endpa; pa += NBPG, va += NBPG) {
pmap_enter(pmap_kernel(), va, pa, VM_PROT_READ | VM_PROT_WRITE,
TRUE);
if (!cacheable)
pmap_changebit(pa, PG_N, ~0);
else
pmap_changebit(pa, 0, ~PG_N);
}
return 0;
}
void
bus_mem_unmap(t, memh, size)
bus_chipset_tag_t t;
bus_mem_handle_t memh;
bus_mem_size_t size;
{
vm_offset_t va, endva;
va = i386_trunc_page(memh);
endva = i386_round_page(memh);
kmem_free(kmem_map, va, endva - va);
}