1992/0630/gnot/mmu.c (diff list | history)

gnot/mmu.c on 1990/03091
1990/03091		#include "u.h"
1992/0321		#include "../port/lib.h"
1990/03091		#include "mem.h" #include "dat.h" #include "fns.h"
1990/06021		struct { Lock; int init; KMap *free;
1991/0821		KMap arena[MB4/BY2PG]; /* kernel mmu maps up to 4MB */
1990/06021		}kmapalloc;
1990/03091		/* * Called splhi, not in Running state */ void mapstack(Proc *p) { ulong tlbvirt, tlbphys;
1990/1004		ulong next; MMU *mm, *mn, *me;
1990/03091
1991/0705
1991/0928		if(p->upage->va != (USERADDR|(p->pid&0xFFFF)) && p->pid != 0)
1990/03091		panic("mapstack %d 0x%lux 0x%lux", p->pid, p->upage->pa, p->upage->va); tlbvirt = USERADDR; tlbphys = PPN(p->upage->pa) | PTEVALID | PTEKERNEL; putkmmu(tlbvirt, tlbphys);
1990/1211		u = (User*)USERADDR;
1990/1004
1991/0705		if(p->newtlb) { flushmmu(); p->newtlb = 0; }
1990/1004		/* * if not a kernel process and this process was not the * last process on this machine, flush & preload mmu */ if(!p->kp && p!=m->lproc){ flushmmu(); m->lproc = p; }
1990/03091		} void
1991/0507		mmurelease(Proc *p) { USED(p); } void
1990/03091		putkmmu(ulong tlbvirt, ulong tlbphys) { if(!(tlbvirt&KZERO)) panic("putkmmu"); tlbvirt &= ~KZERO; KMAP[(tlbvirt&0x003FE000L)>>2] = tlbphys; } void
1991/0705		putmmu(ulong tlbvirt, ulong tlbphys, Page *p)
1990/03091		{ if(tlbvirt&KZERO) panic("putmmu"); tlbphys |= VTAG(tlbvirt)<<24;
1990/1004		tlbvirt = (tlbvirt&0x003FE000L)>>2; UMAP[tlbvirt] = tlbphys;
1990/03091		} void flushmmu(void) { flushcpucache(); *PARAM &= ~TLBFLUSH_; *PARAM |= TLBFLUSH_;
1990/06021		} void kmapinit(void) {
1992/0625		int i;
1992/0630		ulong endscreen;
1992/0625		Page *p;
1990/06021		KMap *k; if(kmapalloc.init == 0){ k = &kmapalloc.arena[0];
1992/0630		k->va = KZERO|(MB4-BY2PG);
1990/06021		k->next = 0; kmapalloc.free = k; kmapalloc.init = 1; return; }
1991/0821
1992/0625		i = 0;
1992/0630		/* * Reclaim map register for pages in bank0; * screen is in virtual space overlaying physical pages; be careful */ endscreen = (PGROUND((ulong)end)&~KZERO) + 256*1024;
1992/0625		for(p = palloc.head; p; p = p->next) {
1992/0630		if(p->pa >= endscreen && p->pa < MB4) {
1992/0625		k = &kmapalloc.arena[p->pa/BY2PG]; k->va = p->pa|KZERO; kunmap(k); i++; }
1990/06021		}
1992/0625		print("%lud free map registers\n", i);
1990/06021		} KMap* kmap(Page *pg) { KMap *k;
1991/1004		int s; s = splhi();
1990/06021		lock(&kmapalloc); k = kmapalloc.free;
1990/0709		if(k == 0){ dumpstack();
1990/06021		panic("kmap");
1990/0709		}
1990/06021		kmapalloc.free = k->next; unlock(&kmapalloc);
1991/1004		splx(s);
1991/0821
1990/06021		k->pa = pg->pa; putkmmu(k->va, PPN(k->pa) | PTEVALID | PTEKERNEL);
1991/0828
1990/06021		return k; } void kunmap(KMap *k) {
1991/0827		int s;
1990/06021		k->pa = 0;
1991/0821		putkmmu(k->va, INVALIDPTE);
1991/0827		s = splhi();
1990/06021		lock(&kmapalloc); k->next = kmapalloc.free; kmapalloc.free = k; unlock(&kmapalloc);
1991/0827		splx(s);
1990/1211		} void invalidateu(void) { putkmmu(USERADDR, INVALIDPTE);
1990/03091		}