1d9c166f51
- OpenFirmware returns overlapping memory regions. Use a simple brute force algorithm to merge these into non-overlapping regions. This fixes bugs in reporting of available memory and also prevents pages from being added twice in the VM system.
245 lines
6.0 KiB
C
245 lines
6.0 KiB
C
/*
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* Copyright (C) 1996 Wolfgang Solfrank.
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* Copyright (C) 1996 TooLs GmbH.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $NetBSD: ofw_machdep.c,v 1.5 2000/05/23 13:25:43 tsubai Exp $
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/disk.h>
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#include <sys/fcntl.h>
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#include <sys/malloc.h>
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#include <sys/stat.h>
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#include <net/ethernet.h>
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#include <dev/ofw/openfirm.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_page.h>
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#include <machine/powerpc.h>
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#include <machine/ofw_machdep.h>
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#include <powerpc/ofw/ofw_pci.h>
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#define OFMEM_REGIONS 32
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static struct mem_region OFmem[OFMEM_REGIONS + 1], OFavail[OFMEM_REGIONS + 3];
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static struct mem_region OFfree[OFMEM_REGIONS + 3];
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extern long ofmsr;
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extern struct pmap ofw_pmap;
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extern int pmap_bootstrapped;
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static int (*ofwcall)(void *);
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/*
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* Memory region utilities: determine if two regions overlap,
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* and merge two overlapping regions into one
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*/
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static int
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memr_overlap(struct mem_region *r1, struct mem_region *r2)
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{
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if ((r1->mr_start + r1->mr_size) < r2->mr_start ||
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(r2->mr_start + r2->mr_size) < r1->mr_start)
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return (FALSE);
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return (TRUE);
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}
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static void
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memr_merge(struct mem_region *from, struct mem_region *to)
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{
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int end;
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end = imax(to->mr_start + to->mr_size, from->mr_start + from->mr_size);
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to->mr_start = imin(from->mr_start, to->mr_start);
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to->mr_size = end - to->mr_start;
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}
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/*
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* This is called during powerpc_init, before the system is really initialized.
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* It shall provide the total and the available regions of RAM.
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* Both lists must have a zero-size entry as terminator.
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* The available regions need not take the kernel into account, but needs
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* to provide space for two additional entry beyond the terminating one.
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*/
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void
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mem_regions(struct mem_region **memp, int *memsz,
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struct mem_region **availp, int *availsz)
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{
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int phandle;
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int asz, msz, fsz;
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int i, j;
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int still_merging;
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/*
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* Get memory.
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*/
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if ((phandle = OF_finddevice("/memory")) == -1
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|| (msz = OF_getprop(phandle, "reg",
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OFmem, sizeof OFmem[0] * OFMEM_REGIONS))
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<= 0
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|| (asz = OF_getprop(phandle, "available",
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OFavail, sizeof OFavail[0] * OFMEM_REGIONS))
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<= 0)
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panic("no memory?");
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*memp = OFmem;
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*memsz = msz / sizeof(struct mem_region);
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/*
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* OFavail may have overlapping regions - collapse these
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* and copy out remaining regions to OFfree
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*/
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asz /= sizeof(struct mem_region);
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do {
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still_merging = FALSE;
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for (i = 0; i < asz; i++) {
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if (OFavail[i].mr_size == 0)
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continue;
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for (j = i+1; j < asz; j++) {
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if (OFavail[j].mr_size == 0)
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continue;
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if (memr_overlap(&OFavail[j], &OFavail[i])) {
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memr_merge(&OFavail[j], &OFavail[i]);
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/* mark inactive */
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OFavail[j].mr_size = 0;
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still_merging = TRUE;
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}
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}
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}
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} while (still_merging == TRUE);
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/* evict inactive ranges */
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for (i = 0, fsz = 0; i < asz; i++) {
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if (OFavail[i].mr_size != 0) {
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OFfree[fsz] = OFavail[i];
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fsz++;
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}
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}
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*availp = OFfree;
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*availsz = fsz;
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}
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void
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set_openfirm_callback(int (*openfirm)(void *))
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{
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ofwcall = openfirm;
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}
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int
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openfirmware(void *args)
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{
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long oldmsr;
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int result;
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u_int srsave[16];
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u_int i;
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__asm __volatile( "\t"
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"sync\n\t"
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"mfmsr %0\n\t"
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"mtmsr %1\n\t"
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"isync\n"
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: "=r" (oldmsr)
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: "r" (ofmsr)
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);
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if (pmap_bootstrapped) {
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/*
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* Swap the kernel's address space with OpenFirmware's
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*/
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for (i = 0; i < 16; i++) {
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srsave[i] = mfsrin(i << ADDR_SR_SHFT);
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mtsrin(i << ADDR_SR_SHFT, ofw_pmap.pm_sr[i]);
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}
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/*
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* Clear battable[] translations
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*/
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__asm __volatile("mtdbatu 2, %0\n"
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"mtdbatu 3, %0" : : "r" (0));
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isync();
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}
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result = ofwcall(args);
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if (pmap_bootstrapped) {
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/*
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* Restore the kernel's addr space. The isync() doesn;t
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* work outside the loop unless mtsrin() is open-coded
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* in an asm statement :(
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*/
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for (i = 0; i < 16; i++) {
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mtsrin(i << ADDR_SR_SHFT, srsave[i]);
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isync();
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}
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}
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__asm( "\t"
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"mtmsr %0\n\t"
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"isync\n"
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: : "r" (oldmsr)
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);
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return (result);
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}
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void
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OF_halt()
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{
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int retval; /* dummy, this may not be needed */
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OF_interpret("shut-down", 1, &retval);
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for (;;); /* just in case */
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}
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void
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OF_reboot()
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{
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int retval; /* dummy, this may not be needed */
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OF_interpret("reset-all", 1, &retval);
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for (;;); /* just in case */
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}
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void
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OF_getetheraddr(device_t dev, u_char *addr)
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{
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phandle_t node;
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node = ofw_pci_find_node(dev);
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OF_getprop(node, "local-mac-address", addr, ETHER_ADDR_LEN);
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}
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