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Add a second memory free list, which holds the first 8M of RAM. This is

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so that devices which must allocate DMA memory in this range (e.g.
PixelStamp graphics boards) have a better chance of doing so, without
an awful hack.
This commit is contained in:
thorpej 1999-05-07 18:04:36 +00:00
parent 4c9c896cc8
commit c7ad933ffa
2 changed files with 21 additions and 7 deletions
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9
sys/arch/pmax/include/vmparam.h
View File

@ -1,14 +1,17 @@
/* $NetBSD: vmparam.h,v 1.8 1998/07/08 04:43:19 thorpej Exp $ */
/* $NetBSD: vmparam.h,v 1.9 1999/05/07 18:04:37 thorpej Exp $ */
#include <mips/vmparam.h>
/*
* DECstation has one physical memory segment.
*/
#define VM_PHYSSEG_MAX 1
#define VM_PHYSSEG_MAX 2 /* 2 free lists */
#define VM_PHYSSEG_STRAT VM_PSTRAT_BSEARCH
#define VM_PHYSSEG_NOADD /* can't add RAM after vm_mem_init */
#define VM_NFREELIST 1
#define VM_NFREELIST 2
#define VM_FREELIST_DEFAULT 0
#define VM_FREELIST_FIRST8 1
/* pcb base */
/*#define pcbb(p) ((u_int)(p)->p_addr) */

19
sys/arch/pmax/pmax/machdep.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.139 1999/04/26 09:23:26 nisimura Exp $ */
/* $NetBSD: machdep.c,v 1.140 1999/05/07 18:04:36 thorpej Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -43,7 +43,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.139 1999/04/26 09:23:26 nisimura Exp $");
__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.140 1999/05/07 18:04:36 thorpej Exp $");
/* from: Utah Hdr: machdep.c 1.63 91/04/24 */
@ -439,11 +439,22 @@ mach_init(argc, argv, code, cv, bim, bip)
/*
* Load the rest of the available pages into the VM system.
* Put the first 8M of RAM onto a lower-priority free list, since
* some TC boards (e.g. PixelStamp boards) are only able to DMA
* into this region, and we want them to have a fighting chance of
* allocating their DMA memory during autoconfiguratoin.
*/
first = round_page(MIPS_KSEG0_TO_PHYS(kernend));
last = mem_clusters[0].start + mem_clusters[0].size;
uvm_page_physload(atop(first), atop(last), atop(first), atop(last),
VM_FREELIST_DEFAULT);
if (last <= (8 * 1024 * 1024)) {
uvm_page_physload(atop(first), atop(last), atop(first),
atop(last), VM_FREELIST_DEFAULT);
} else {
uvm_page_physload(atop(first), atop(8 * 1024 * 1024),
atop(first), atop(8 * 1024 * 1024), VM_FREELIST_FIRST8);
uvm_page_physload(atop(8 * 1024 * 1024), atop(last),
atop(8 * 1024 * 1024), atop(last), VM_FREELIST_DEFAULT);
}
/*
* Initialize error message buffer (at end of core).