2011-03-30 12:46:40 +00:00
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/*
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* Size memory and create the kernel page-tables on the fly while doing so.
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* Called from main(), this code should only be run by the bootstrap processor.
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*
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* MemMin is what the bootstrap code in l.s has already mapped;
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* MemMax is the limit of physical memory to scan.
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*/
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#include "u.h"
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#include "../port/lib.h"
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#include "mem.h"
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#include "dat.h"
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#include "fns.h"
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#include "io.h"
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#include "ureg.h"
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#define MEMDEBUG 0
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enum {
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MemUPA = 0, /* unbacked physical address */
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MemRAM = 1, /* physical memory */
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MemUMB = 2, /* upper memory block (<16MB) */
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MemReserved = 3,
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NMemType = 4,
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KB = 1024,
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MemMin = 8*MB,
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MemMax = (3*1024+768)*MB,
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};
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typedef struct Map Map;
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struct Map {
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ulong size;
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ulong addr;
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};
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typedef struct RMap RMap;
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struct RMap {
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char* name;
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Map* map;
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Map* mapend;
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Lock;
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};
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/*
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* Memory allocation tracking.
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*/
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static Map mapupa[16];
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static RMap rmapupa = {
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"unallocated unbacked physical memory",
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mapupa,
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&mapupa[nelem(mapupa)-1],
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};
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static Map xmapupa[16];
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static RMap xrmapupa = {
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"unbacked physical memory",
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xmapupa,
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&xmapupa[nelem(xmapupa)-1],
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};
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static Map mapram[16];
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static RMap rmapram = {
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"physical memory",
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mapram,
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&mapram[nelem(mapram)-1],
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};
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static Map mapumb[64];
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static RMap rmapumb = {
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"upper memory block",
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mapumb,
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&mapumb[nelem(mapumb)-1],
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};
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static Map mapumbrw[16];
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static RMap rmapumbrw = {
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"UMB device memory",
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mapumbrw,
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&mapumbrw[nelem(mapumbrw)-1],
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};
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void
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mapprint(RMap *rmap)
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{
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Map *mp;
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print("%s\n", rmap->name);
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for(mp = rmap->map; mp->size; mp++)
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print("\t%8.8luX %8.8luX (%lud)\n", mp->addr, mp->addr+mp->size, mp->size);
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}
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void
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memdebug(void)
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{
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ulong maxpa, maxpa1, maxpa2;
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maxpa = (nvramread(0x18)<<8)|nvramread(0x17);
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maxpa1 = (nvramread(0x31)<<8)|nvramread(0x30);
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maxpa2 = (nvramread(0x16)<<8)|nvramread(0x15);
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print("maxpa = %luX -> %luX, maxpa1 = %luX maxpa2 = %luX\n",
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maxpa, MB+maxpa*KB, maxpa1, maxpa2);
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mapprint(&rmapram);
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mapprint(&rmapumb);
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mapprint(&rmapumbrw);
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mapprint(&rmapupa);
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}
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void
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mapfree(RMap* rmap, ulong addr, ulong size)
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{
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Map *mp;
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ulong t;
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if(size <= 0)
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return;
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lock(rmap);
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for(mp = rmap->map; mp->addr <= addr && mp->size; mp++)
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;
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if(mp > rmap->map && (mp-1)->addr+(mp-1)->size == addr){
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(mp-1)->size += size;
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if(addr+size == mp->addr){
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(mp-1)->size += mp->size;
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while(mp->size){
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mp++;
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(mp-1)->addr = mp->addr;
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(mp-1)->size = mp->size;
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}
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}
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}
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else{
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if(addr+size == mp->addr && mp->size){
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mp->addr -= size;
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mp->size += size;
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}
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else do{
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if(mp >= rmap->mapend){
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print("mapfree: %s: losing 0x%luX, %ld\n",
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rmap->name, addr, size);
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break;
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}
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t = mp->addr;
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mp->addr = addr;
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addr = t;
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t = mp->size;
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mp->size = size;
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mp++;
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}while(size = t);
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}
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unlock(rmap);
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}
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ulong
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mapalloc(RMap* rmap, ulong addr, int size, int align)
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{
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Map *mp;
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ulong maddr, oaddr;
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lock(rmap);
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for(mp = rmap->map; mp->size; mp++){
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maddr = mp->addr;
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if(addr){
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/*
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* A specific address range has been given:
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* if the current map entry is greater then
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* the address is not in the map;
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* if the current map entry does not overlap
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* the beginning of the requested range then
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* continue on to the next map entry;
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* if the current map entry does not entirely
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* contain the requested range then the range
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* is not in the map.
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*/
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if(maddr > addr)
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break;
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if(mp->size < addr - maddr) /* maddr+mp->size < addr, but no overflow */
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continue;
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if(addr - maddr > mp->size - size) /* addr+size > maddr+mp->size, but no overflow */
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break;
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maddr = addr;
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}
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if(align > 0)
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maddr = ((maddr+align-1)/align)*align;
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if(mp->addr+mp->size-maddr < size)
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continue;
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oaddr = mp->addr;
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mp->addr = maddr+size;
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mp->size -= maddr-oaddr+size;
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if(mp->size == 0){
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do{
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mp++;
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(mp-1)->addr = mp->addr;
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}while((mp-1)->size = mp->size);
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}
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unlock(rmap);
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if(oaddr != maddr)
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mapfree(rmap, oaddr, maddr-oaddr);
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return maddr;
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}
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unlock(rmap);
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return 0;
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}
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/*
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* Allocate from the ram map directly to make page tables.
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* Called by mmuwalk during e820scan.
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*/
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void*
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rampage(void)
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{
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ulong m;
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m = mapalloc(&rmapram, 0, BY2PG, BY2PG);
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if(m == 0)
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return nil;
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return KADDR(m);
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}
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static void
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umbexclude(void)
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{
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int size;
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ulong addr;
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char *op, *p, *rptr;
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if((p = getconf("umbexclude")) == nil)
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return;
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while(p && *p != '\0' && *p != '\n'){
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op = p;
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addr = strtoul(p, &rptr, 0);
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if(rptr == nil || rptr == p || *rptr != '-'){
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print("umbexclude: invalid argument <%s>\n", op);
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break;
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}
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p = rptr+1;
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size = strtoul(p, &rptr, 0) - addr + 1;
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if(size <= 0){
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print("umbexclude: bad range <%s>\n", op);
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break;
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}
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if(rptr != nil && *rptr == ',')
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*rptr++ = '\0';
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p = rptr;
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mapalloc(&rmapumb, addr, size, 0);
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}
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}
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static void
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umbscan(void)
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{
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uchar *p;
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/*
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* Scan the Upper Memory Blocks (0xA0000->0xF0000) for pieces
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* which aren't used; they can be used later for devices which
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* want to allocate some virtual address space.
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* Check for two things:
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* 1) device BIOS ROM. This should start with a two-byte header
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* of 0x55 0xAA, followed by a byte giving the size of the ROM
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* in 512-byte chunks. These ROM's must start on a 2KB boundary.
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* 2) device memory. This is read-write.
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* There are some assumptions: there's VGA memory at 0xA0000 and
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* the VGA BIOS ROM is at 0xC0000. Also, if there's no ROM signature
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* at 0xE0000 then the whole 64KB up to 0xF0000 is theoretically up
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* for grabs; check anyway.
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*/
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p = KADDR(0xD0000);
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while(p < (uchar*)KADDR(0xE0000)){
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/*
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* Test for 0x55 0xAA before poking obtrusively,
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* some machines (e.g. Thinkpad X20) seem to map
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* something dynamic here (cardbus?) causing weird
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* problems if it is changed.
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*/
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if(p[0] == 0x55 && p[1] == 0xAA){
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p += p[2]*512;
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continue;
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}
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p[0] = 0xCC;
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p[2*KB-1] = 0xCC;
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if(p[0] != 0xCC || p[2*KB-1] != 0xCC){
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p[0] = 0x55;
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p[1] = 0xAA;
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p[2] = 4;
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if(p[0] == 0x55 && p[1] == 0xAA){
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p += p[2]*512;
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continue;
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}
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if(p[0] == 0xFF && p[1] == 0xFF)
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mapfree(&rmapumb, PADDR(p), 2*KB);
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}
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else
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mapfree(&rmapumbrw, PADDR(p), 2*KB);
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p += 2*KB;
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}
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p = KADDR(0xE0000);
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if(p[0] != 0x55 || p[1] != 0xAA){
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p[0] = 0xCC;
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p[64*KB-1] = 0xCC;
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if(p[0] != 0xCC && p[64*KB-1] != 0xCC)
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mapfree(&rmapumb, PADDR(p), 64*KB);
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}
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umbexclude();
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}
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static void
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lowraminit(void)
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{
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ulong n, pa, x;
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uchar *bda;
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/*
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* Initialise the memory bank information for conventional memory
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* (i.e. less than 640KB). The base is the first location after the
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* bootstrap processor MMU information and the limit is obtained from
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* the BIOS data area.
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*/
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x = PADDR(CPU0END);
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bda = (uchar*)KADDR(0x400);
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n = ((bda[0x14]<<8)|bda[0x13])*KB-x;
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mapfree(&rmapram, x, n);
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memset(KADDR(x), 0, n); /* keep us honest */
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x = PADDR(PGROUND((ulong)end));
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pa = MemMin;
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if(x > pa)
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panic("kernel too big");
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mapfree(&rmapram, x, pa-x);
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memset(KADDR(x), 0, pa-x); /* keep us honest */
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}
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static void
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ramscan(ulong maxmem)
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{
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ulong *k0, kzero, map, maxkpa, maxpa, pa, *pte, *table, *va, vbase, x;
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int nvalid[NMemType];
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/*
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* The bootstrap code has has created a prototype page
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* table which maps the first MemMin of physical memory to KZERO.
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* The page directory is at m->pdb and the first page of
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* free memory is after the per-processor MMU information.
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*/
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pa = MemMin;
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/*
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* Check if the extended memory size can be obtained from the CMOS.
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* If it's 0 then it's either not known or >= 64MB. Always check
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* at least 24MB in case there's a memory gap (up to 8MB) below 16MB;
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* in this case the memory from the gap is remapped to the top of
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* memory.
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* The value in CMOS is supposed to be the number of KB above 1MB.
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*/
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if(maxmem == 0){
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x = (nvramread(0x18)<<8)|nvramread(0x17);
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if(x == 0 || x >= (63*KB))
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maxpa = MemMax;
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else
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maxpa = MB+x*KB;
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if(maxpa < 24*MB)
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maxpa = 24*MB;
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}else
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maxpa = maxmem;
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maxkpa = (u32int)-KZERO; /* 2^32 - KZERO */
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/*
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* March up memory from MemMin to maxpa 1MB at a time,
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* mapping the first page and checking the page can
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* be written and read correctly. The page tables are created here
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* on the fly, allocating from low memory as necessary.
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*/
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k0 = (ulong*)KADDR(0);
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kzero = *k0;
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map = 0;
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x = 0x12345678;
|
|
|
|
memset(nvalid, 0, sizeof(nvalid));
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Can't map memory to KADDR(pa) when we're walking because
|
|
|
|
* can only use KADDR for relatively low addresses.
|
|
|
|
* Instead, map each 4MB we scan to the virtual address range
|
|
|
|
* MemMin->MemMin+4MB while we are scanning.
|
|
|
|
*/
|
|
|
|
vbase = MemMin;
|
|
|
|
while(pa < maxpa){
|
|
|
|
/*
|
|
|
|
* Map the page. Use mapalloc(&rmapram, ...) to make
|
|
|
|
* the page table if necessary, it will be returned to the
|
|
|
|
* pool later if it isn't needed. Map in a fixed range (the second 4M)
|
|
|
|
* because high physical addresses cannot be passed to KADDR.
|
|
|
|
*/
|
|
|
|
va = (void*)(vbase + pa%(4*MB));
|
|
|
|
table = &m->pdb[PDX(va)];
|
|
|
|
if(pa%(4*MB) == 0){
|
|
|
|
if(map == 0 && (map = mapalloc(&rmapram, 0, BY2PG, BY2PG)) == 0)
|
|
|
|
break;
|
|
|
|
memset(KADDR(map), 0, BY2PG);
|
|
|
|
*table = map|PTEWRITE|PTEVALID;
|
|
|
|
memset(nvalid, 0, sizeof(nvalid));
|
|
|
|
}
|
|
|
|
table = KADDR(PPN(*table));
|
|
|
|
pte = &table[PTX(va)];
|
|
|
|
|
|
|
|
*pte = pa|PTEWRITE|PTEUNCACHED|PTEVALID;
|
|
|
|
mmuflushtlb(PADDR(m->pdb));
|
|
|
|
/*
|
|
|
|
* Write a pattern to the page and write a different
|
|
|
|
* pattern to a possible mirror at KZERO. If the data
|
|
|
|
* reads back correctly the chunk is some type of RAM (possibly
|
|
|
|
* a linearly-mapped VGA framebuffer, for instance...) and
|
|
|
|
* can be cleared and added to the memory pool. If not, the
|
|
|
|
* chunk is marked uncached and added to the UMB pool if <16MB
|
|
|
|
* or is marked invalid and added to the UPA pool.
|
|
|
|
*/
|
|
|
|
*va = x;
|
|
|
|
*k0 = ~x;
|
|
|
|
if(*va == x){
|
|
|
|
nvalid[MemRAM] += MB/BY2PG;
|
|
|
|
mapfree(&rmapram, pa, MB);
|
|
|
|
|
|
|
|
do{
|
|
|
|
*pte++ = pa|PTEWRITE|PTEVALID;
|
|
|
|
pa += BY2PG;
|
|
|
|
}while(pa % MB);
|
|
|
|
mmuflushtlb(PADDR(m->pdb));
|
|
|
|
/* memset(va, 0, MB); so damn slow to memset all of memory */
|
|
|
|
}
|
|
|
|
else if(pa < 16*MB){
|
|
|
|
nvalid[MemUMB] += MB/BY2PG;
|
|
|
|
mapfree(&rmapumb, pa, MB);
|
|
|
|
|
|
|
|
do{
|
|
|
|
*pte++ = pa|PTEWRITE|PTEUNCACHED|PTEVALID;
|
|
|
|
pa += BY2PG;
|
|
|
|
}while(pa % MB);
|
|
|
|
}
|
|
|
|
else{
|
|
|
|
nvalid[MemUPA] += MB/BY2PG;
|
|
|
|
mapfree(&rmapupa, pa, MB);
|
|
|
|
|
|
|
|
*pte = 0;
|
|
|
|
pa += MB;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* Done with this 4MB chunk, review the options:
|
|
|
|
* 1) not physical memory and >=16MB - invalidate the PDB entry;
|
|
|
|
* 2) physical memory - use the 4MB page extension if possible;
|
|
|
|
* 3) not physical memory and <16MB - use the 4MB page extension
|
|
|
|
* if possible;
|
|
|
|
* 4) mixed or no 4MB page extension - commit the already
|
|
|
|
* initialised space for the page table.
|
|
|
|
*/
|
|
|
|
if(pa%(4*MB) == 0 && pa >= 32*MB && nvalid[MemUPA] == (4*MB)/BY2PG){
|
|
|
|
/*
|
|
|
|
* If we encounter a 4MB chunk of missing memory
|
|
|
|
* at a sufficiently high offset, call it the end of
|
|
|
|
* memory. Otherwise we run the risk of thinking
|
|
|
|
* that video memory is real RAM.
|
|
|
|
*/
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if(pa <= maxkpa && pa%(4*MB) == 0){
|
|
|
|
table = &m->pdb[PDX(KADDR(pa - 4*MB))];
|
|
|
|
if(nvalid[MemUPA] == (4*MB)/BY2PG)
|
|
|
|
*table = 0;
|
|
|
|
else if(nvalid[MemRAM] == (4*MB)/BY2PG && (m->cpuiddx & 0x08))
|
|
|
|
*table = (pa - 4*MB)|PTESIZE|PTEWRITE|PTEVALID;
|
|
|
|
else if(nvalid[MemUMB] == (4*MB)/BY2PG && (m->cpuiddx & 0x08))
|
|
|
|
*table = (pa - 4*MB)|PTESIZE|PTEWRITE|PTEUNCACHED|PTEVALID;
|
|
|
|
else{
|
|
|
|
*table = map|PTEWRITE|PTEVALID;
|
|
|
|
map = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
mmuflushtlb(PADDR(m->pdb));
|
|
|
|
x += 0x3141526;
|
|
|
|
}
|
|
|
|
/*
|
|
|
|
* If we didn't reach the end of the 4MB chunk, that part won't
|
|
|
|
* be mapped. Commit the already initialised space for the page table.
|
|
|
|
*/
|
|
|
|
if(pa % (4*MB) && pa <= maxkpa){
|
|
|
|
m->pdb[PDX(KADDR(pa))] = map|PTEWRITE|PTEVALID;
|
|
|
|
map = 0;
|
|
|
|
}
|
|
|
|
if(map)
|
|
|
|
mapfree(&rmapram, map, BY2PG);
|
|
|
|
|
|
|
|
m->pdb[PDX(vbase)] = 0;
|
|
|
|
mmuflushtlb(PADDR(m->pdb));
|
|
|
|
|
|
|
|
mapfree(&rmapupa, pa, (u32int)-pa);
|
|
|
|
*k0 = kzero;
|
|
|
|
}
|
|
|
|
|
|
|
|
typedef struct Emap Emap;
|
|
|
|
struct Emap
|
|
|
|
{
|
|
|
|
uvlong base;
|
|
|
|
uvlong len;
|
|
|
|
};
|
|
|
|
static Emap emap[16];
|
|
|
|
int nemap;
|
|
|
|
|
|
|
|
static int
|
|
|
|
emapcmp(const void *va, const void *vb)
|
|
|
|
{
|
|
|
|
Emap *a, *b;
|
|
|
|
|
|
|
|
a = (Emap*)va;
|
|
|
|
b = (Emap*)vb;
|
|
|
|
if(a->base < b->base)
|
|
|
|
return -1;
|
|
|
|
if(a->base > b->base)
|
|
|
|
return 1;
|
2011-11-05 05:19:52 +00:00
|
|
|
return a->len - b->len;
|
2011-03-30 12:46:40 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static void
|
|
|
|
map(ulong base, ulong len, int type)
|
|
|
|
{
|
|
|
|
ulong e, n;
|
|
|
|
ulong *table, flags, maxkpa;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Split any call crossing MemMin to make below simpler.
|
|
|
|
*/
|
|
|
|
if(base < MemMin && len > MemMin-base){
|
|
|
|
n = MemMin - base;
|
|
|
|
map(base, n, type);
|
|
|
|
map(MemMin, len-n, type);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Let lowraminit and umbscan hash out the low MemMin.
|
|
|
|
*/
|
|
|
|
if(base < MemMin)
|
|
|
|
return;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Any non-memory below 16*MB is used as upper mem blocks.
|
|
|
|
*/
|
|
|
|
if(type == MemUPA && base < 16*MB && base+len > 16*MB){
|
|
|
|
map(base, 16*MB-base, MemUMB);
|
|
|
|
map(16*MB, len-(16*MB-base), MemUPA);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Memory below CPU0END is reserved for the kernel
|
|
|
|
* and already mapped.
|
|
|
|
*/
|
|
|
|
if(base < PADDR(CPU0END)){
|
|
|
|
n = PADDR(CPU0END) - base;
|
|
|
|
if(len <= n)
|
|
|
|
return;
|
|
|
|
map(PADDR(CPU0END), len-n, type);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Memory between KTZERO and end is the kernel itself
|
|
|
|
* and is already mapped.
|
|
|
|
*/
|
|
|
|
if(base < PADDR(KTZERO) && base+len > PADDR(KTZERO)){
|
|
|
|
map(base, PADDR(KTZERO)-base, type);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
if(PADDR(KTZERO) < base && base < PADDR(PGROUND((ulong)end))){
|
|
|
|
n = PADDR(PGROUND((ulong)end));
|
|
|
|
if(len <= n)
|
|
|
|
return;
|
|
|
|
map(PADDR(PGROUND((ulong)end)), len-n, type);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Now we have a simple case.
|
|
|
|
*/
|
|
|
|
// print("map %.8lux %.8lux %d\n", base, base+len, type);
|
|
|
|
switch(type){
|
|
|
|
case MemRAM:
|
|
|
|
mapfree(&rmapram, base, len);
|
|
|
|
flags = PTEWRITE|PTEVALID;
|
|
|
|
break;
|
|
|
|
case MemUMB:
|
|
|
|
mapfree(&rmapumb, base, len);
|
|
|
|
flags = PTEWRITE|PTEUNCACHED|PTEVALID;
|
|
|
|
break;
|
|
|
|
case MemUPA:
|
|
|
|
mapfree(&rmapupa, base, len);
|
|
|
|
flags = 0;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
case MemReserved:
|
|
|
|
flags = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* bottom MemMin is already mapped - just twiddle flags.
|
|
|
|
* (not currently used - see above)
|
|
|
|
*/
|
|
|
|
if(base < MemMin){
|
|
|
|
table = KADDR(PPN(m->pdb[PDX(base)]));
|
|
|
|
e = base+len;
|
|
|
|
base = PPN(base);
|
|
|
|
for(; base<e; base+=BY2PG)
|
|
|
|
table[PTX(base)] |= flags;
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Only map from KZERO to 2^32.
|
|
|
|
*/
|
|
|
|
if(flags){
|
|
|
|
maxkpa = -KZERO;
|
|
|
|
if(base >= maxkpa)
|
|
|
|
return;
|
|
|
|
if(len > maxkpa-base)
|
|
|
|
len = maxkpa - base;
|
|
|
|
pdbmap(m->pdb, base|flags, base+KZERO, len);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
e820scan(void)
|
|
|
|
{
|
2011-11-05 05:19:52 +00:00
|
|
|
ulong base, len;
|
2011-03-30 12:46:40 +00:00
|
|
|
uvlong last;
|
|
|
|
Emap *e;
|
2011-05-14 19:20:16 +00:00
|
|
|
char *s;
|
2011-11-05 05:19:52 +00:00
|
|
|
int i;
|
2011-03-30 12:46:40 +00:00
|
|
|
|
2011-11-05 05:19:52 +00:00
|
|
|
/* passed by bootloader */
|
|
|
|
if((s = getconf("e820")) == nil)
|
|
|
|
return -1;
|
|
|
|
for(nemap = 0; nemap < nelem(emap); nemap++){
|
|
|
|
if(*s == 0)
|
|
|
|
break;
|
|
|
|
e = emap + nemap;
|
|
|
|
e->base = strtoull(s, &s, 16);
|
|
|
|
if(*s != ' ')
|
|
|
|
break;
|
|
|
|
e->len = strtoull(s, &s, 16) - e->base;
|
|
|
|
if(*s != ' ' && *s != 0 || e->len >= 1ull<<32 || e->len == 0)
|
|
|
|
break;
|
2011-03-30 12:46:40 +00:00
|
|
|
}
|
|
|
|
if(nemap == 0)
|
|
|
|
return -1;
|
|
|
|
qsort(emap, nemap, sizeof emap[0], emapcmp);
|
|
|
|
last = 0;
|
|
|
|
for(i=0; i<nemap; i++){
|
|
|
|
e = &emap[i];
|
|
|
|
/*
|
|
|
|
* pull out the info but only about the low 32 bits...
|
|
|
|
*/
|
|
|
|
if(e->base >= (1LL<<32))
|
|
|
|
break;
|
|
|
|
base = e->base;
|
|
|
|
if(base+e->len > (1LL<<32))
|
|
|
|
len = -base;
|
|
|
|
else
|
|
|
|
len = e->len;
|
|
|
|
/*
|
|
|
|
* If the map skips addresses, mark them available.
|
|
|
|
*/
|
|
|
|
if(last < e->base)
|
|
|
|
map(last, e->base-last, MemUPA);
|
|
|
|
last = base+len;
|
2011-11-05 05:19:52 +00:00
|
|
|
map(base, len, MemRAM);
|
2011-03-30 12:46:40 +00:00
|
|
|
}
|
|
|
|
if(last < (1LL<<32))
|
|
|
|
map(last, (u32int)-last, MemUPA);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
meminit(void)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
Map *mp;
|
|
|
|
Confmem *cm;
|
|
|
|
ulong pa, *pte;
|
|
|
|
ulong maxmem, lost;
|
|
|
|
char *p;
|
|
|
|
|
|
|
|
if(p = getconf("*maxmem"))
|
|
|
|
maxmem = strtoul(p, 0, 0);
|
|
|
|
else
|
|
|
|
maxmem = 0;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set special attributes for memory between 640KB and 1MB:
|
|
|
|
* VGA memory is writethrough;
|
|
|
|
* BIOS ROM's/UMB's are uncached;
|
|
|
|
* then scan for useful memory.
|
|
|
|
*/
|
|
|
|
for(pa = 0xA0000; pa < 0xC0000; pa += BY2PG){
|
|
|
|
pte = mmuwalk(m->pdb, (ulong)KADDR(pa), 2, 0);
|
|
|
|
*pte |= PTEWT;
|
|
|
|
}
|
|
|
|
for(pa = 0xC0000; pa < 0x100000; pa += BY2PG){
|
|
|
|
pte = mmuwalk(m->pdb, (ulong)KADDR(pa), 2, 0);
|
|
|
|
*pte |= PTEUNCACHED;
|
|
|
|
}
|
|
|
|
mmuflushtlb(PADDR(m->pdb));
|
|
|
|
|
|
|
|
umbscan();
|
|
|
|
lowraminit();
|
|
|
|
if(e820scan() < 0)
|
|
|
|
ramscan(maxmem);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set the conf entries describing banks of allocatable memory.
|
|
|
|
*/
|
|
|
|
for(i=0; i<nelem(mapram) && i<nelem(conf.mem); i++){
|
|
|
|
mp = &rmapram.map[i];
|
|
|
|
cm = &conf.mem[i];
|
|
|
|
cm->base = mp->addr;
|
|
|
|
cm->npage = mp->size/BY2PG;
|
|
|
|
}
|
|
|
|
|
|
|
|
lost = 0;
|
|
|
|
for(; i<nelem(mapram); i++)
|
|
|
|
lost += rmapram.map[i].size;
|
|
|
|
if(lost)
|
|
|
|
print("meminit - lost %lud bytes\n", lost);
|
|
|
|
|
|
|
|
if(MEMDEBUG)
|
|
|
|
memdebug();
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Allocate memory from the upper memory blocks.
|
|
|
|
*/
|
|
|
|
ulong
|
|
|
|
umbmalloc(ulong addr, int size, int align)
|
|
|
|
{
|
|
|
|
ulong a;
|
|
|
|
|
|
|
|
if(a = mapalloc(&rmapumb, addr, size, align))
|
|
|
|
return (ulong)KADDR(a);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
umbfree(ulong addr, int size)
|
|
|
|
{
|
|
|
|
mapfree(&rmapumb, PADDR(addr), size);
|
|
|
|
}
|
|
|
|
|
|
|
|
ulong
|
|
|
|
umbrwmalloc(ulong addr, int size, int align)
|
|
|
|
{
|
|
|
|
ulong a;
|
|
|
|
uchar *p;
|
|
|
|
|
|
|
|
if(a = mapalloc(&rmapumbrw, addr, size, align))
|
|
|
|
return(ulong)KADDR(a);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Perhaps the memory wasn't visible before
|
|
|
|
* the interface is initialised, so try again.
|
|
|
|
*/
|
|
|
|
if((a = umbmalloc(addr, size, align)) == 0)
|
|
|
|
return 0;
|
|
|
|
p = (uchar*)a;
|
|
|
|
p[0] = 0xCC;
|
|
|
|
p[size-1] = 0xCC;
|
|
|
|
if(p[0] == 0xCC && p[size-1] == 0xCC)
|
|
|
|
return a;
|
|
|
|
umbfree(a, size);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
umbrwfree(ulong addr, int size)
|
|
|
|
{
|
|
|
|
mapfree(&rmapumbrw, PADDR(addr), size);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Give out otherwise-unused physical address space
|
|
|
|
* for use in configuring devices. Note that unlike upamalloc
|
|
|
|
* before it, upaalloc does not map the physical address
|
|
|
|
* into virtual memory. Call vmap to do that.
|
|
|
|
*/
|
|
|
|
ulong
|
|
|
|
upaalloc(int size, int align)
|
|
|
|
{
|
|
|
|
ulong a;
|
|
|
|
|
|
|
|
a = mapalloc(&rmapupa, 0, size, align);
|
|
|
|
if(a == 0){
|
|
|
|
print("out of physical address space allocating %d\n", size);
|
|
|
|
mapprint(&rmapupa);
|
|
|
|
}
|
|
|
|
return a;
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
upafree(ulong pa, int size)
|
|
|
|
{
|
|
|
|
mapfree(&rmapupa, pa, size);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
upareserve(ulong pa, int size)
|
|
|
|
{
|
|
|
|
ulong a;
|
|
|
|
|
|
|
|
a = mapalloc(&rmapupa, pa, size, 0);
|
|
|
|
if(a != pa){
|
|
|
|
/*
|
|
|
|
* This can happen when we're using the E820
|
|
|
|
* map, which might have already reserved some
|
|
|
|
* of the regions claimed by the pci devices.
|
|
|
|
*/
|
|
|
|
// print("upareserve: cannot reserve pa=%#.8lux size=%d\n", pa, size);
|
|
|
|
if(a != 0)
|
|
|
|
mapfree(&rmapupa, a, size);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
memorysummary(void)
|
|
|
|
{
|
|
|
|
memdebug();
|
|
|
|
}
|
|
|
|
|