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Fix the vunmapbuf() problem, by zeroing out the PTEs before freeing the VA 

range.  This is reasonable given that we inserted the PTEs manually in the
first place.
Also try to use specific cache/TLB purges.
This commit is contained in:
mycroft 1999-03-28 06:35:38 +00:00
parent 9c02b3c942
commit ea8db6d88d
1 changed files with 28 additions and 8 deletions
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36
sys/arch/arm32/arm32/vm_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.36 1999/03/26 22:00:25 mycroft Exp $ */
/* $NetBSD: vm_machdep.c,v 1.37 1999/03/28 06:35:38 mycroft Exp $ */
/*
* Copyright (c) 1994-1998 Mark Brinicombe.
@ -338,10 +338,12 @@ vmapbuf(bp, len)
if ((bp->b_flags & B_PHYS) == 0)
panic("vmapbuf");
faddr = trunc_page(bp->b_saveaddr = bp->b_data);
taddr = uvm_km_valloc_wait(phys_map, len);
faddr = trunc_page(bp->b_data);
off = (vm_offset_t)bp->b_data - faddr;
len = round_page(off + len);
taddr = uvm_km_valloc_wait(phys_map, len);
bp->b_saveaddr = bp->b_data;
bp->b_data = (caddr_t)(taddr + off);
/*
@ -362,11 +364,14 @@ vmapbuf(bp, len)
cpu_cache_purgeID();
do {
*fpte = (*fpte) & ~(PT_C | PT_B);
*tpte++ = *fpte++;
len -= PAGE_SIZE;
} while (len > 0);
cpu_tlb_flushID();
if (len <= 0x1000)
cpu_tlb_flushID_SE(taddr);
else
cpu_tlb_flushID();
}
/*
@ -380,6 +385,7 @@ vunmapbuf(bp, len)
vm_size_t len;
{
vm_offset_t addr, off;
pt_entry_t *pte;
#ifdef PMAP_DEBUG
if (pmap_debug_level >= 0)
@ -397,13 +403,27 @@ vunmapbuf(bp, len)
addr = trunc_page(bp->b_data);
off = (vm_offset_t)bp->b_data - addr;
len = round_page(off + len);
uvm_km_free_wakeup(phys_map, addr, len);
bp->b_data = bp->b_saveaddr;
bp->b_saveaddr = 0;
cpu_cache_purgeID_rng(addr, len);
pte = pmap_pte(vm_map_pmap(phys_map), addr);
cpu_tlb_flushID();
if (len <= 0x2000)
cpu_cache_purgeID_rng(addr, len);
else
cpu_cache_purgeID();
do {
*pte++ = 0;
len -= PAGE_SIZE;
} while (len > 0);
if (len <= 0x1000)
cpu_tlb_flushID_SE(addr);
else
cpu_tlb_flushID();
uvm_km_free_wakeup(phys_map, addr, len);
}
/*