amd64 and i386.
The fillkpt loop is equivalent to the following:
do {
/* fill in the slot */
/* increment %ebx to the next slot */
/* increment %eax to the next pa */
} while (%ecx > 0)
The issue here is that if %ecx = 0 (i.e., the chunk we are trying to
map is zero-sized), there is still one entry created in the page table.
The kernel expects the va<->pa translation to be linear in low memory.
If there is a zero-sized chunk, the dead entry creates a +4096 offset in
the virtual space, with two consecutive entries that point to the same
physical address. In other words, the mappings are not linear anymore,
which causes the kernel to die.
Before my recent changes, there were only two big chunks that were
mapped, and neither of these could be zero-sized. Now, with multiple,
fine-grained chunks, it is possible that the [SYMS]+[PRELOADED_MODULES]
chunk could be zero-sized.
[PRELOADED_MODULES] is almost never here, and [SYMS] is always here on
default kernels. Except for floppies, where the bootloader does not load
[SYMS].
Should fix PR 51148.
$NetBSD: README,v 1.62 2014/03/31 11:25:48 martin Exp $
acorn26 arm 20000509 Acorn ARM2- and ARM3-based machines
acorn32 arm 20011118 Acorn computers Ltd. ARM 6/7/SA based machines
algor mipsel,mips64el 20010528 Algorithmics, Ltd. MIPS evaluation boards
alpha alpha 19950213 Compaq (formerly Digital Equipment Corp.) Alpha
amd64 x86_64 20010619 AMD's x86 64 bit architecture
amiga m68k 19930902 Commodore et al. Amiga
amigappc powerpc 20000525 Phase 5 Amiga
arc mipsel,mips64el 20000123 MIPS Advanced Risc Computing spec machines
atari m68k 19950326 Atari TT30, Falcon, and Hades
bebox powerpc 19971014 Be Inc. BeBox
cats arm 19981005 Chalice Technologies, CATS motherboard
cesfic m68k 20010514 FIC8234 VME processor board
cobalt mipsel,mips64el 20000319 Cobalt Networks Microservers
dreamcast sh3el 20010107 SEGA Dreamcast
emips mipseb 20110126 Machines based on Extensible MIPS
epoc32 arm 20130502 32bit EPOC OS machines
evbarm armeb 20010905 ARM-based eval boards
evbmips mipseb,mipsel,mips64eb,mips64el 20020307 MIPS-based eval boards
evbppc powerpc,powerpc64 20021209 PowerPC-based eval boards
evbsh3 sh3eb,sh3el 20010206 Hitachi SuperH(TM) sh3 and sh4 eval boards
ews4800mips mipseb 20051229 NEC's MIPS based EWS4800 workstations
hp300 m68k 19930512 Hewlett Packard 300- and 400-series machines
hppa hppa 20020606 Hewlett Packard 700-series machines
hpcarm arm 20010220 ARM based handheld PCs
hpcmips mipsel 19990925 MIPS based handheld PCs
hpcsh sh3el 20010117 Hitachi SuperH(TM) based handheld PCs
i386 i386 19930321 Intel/AMD etc. x86 processor line
ia64 ia64 00000000 Intel Itanium/Itanium2 processor based workstations
ibmnws powerpc 00000000 IBM Network Station Thin Clients
iyonix arm 20040713 Castle Technology xscale based workstations
landisk sh3el 20060901 SH4 processor based NAS appliances by I-O DATA
luna68k m68k 20000105 LUNA product line of OMRON Tateisi Electronics
mac68k m68k 19930929 Apple Macintosh
macppc powerpc,powerpc64 19980515 Apple Power Macintosh and clones
mipsco mipseb 20000812 MIPS Corp Magnum 3000 computers
mmeye sh3eb 19990913 Hitachi SuperH(TM) computer controlled camera
mvme68k m68k 19950725 Motorola's VMEbus 68K based single board computers
mvmeppc powerpc 20020227 Motorola's PowerPC machines running older PPCBUG
netwinder arm 20010609 StrongARM based Netwinder machines
news68k m68k 19991209 Sony's m68k based NET WORK STATION
newsmips mipseb 19980218 Sony's MIPS based NET WORK STATION
next68k m68k 19980609 NeXT Computer's cubes and slabs
ofppc powerpc,powerpc64 19980528 Open Firmware based PowerPC machines
playstation2 mipsel 20011016 Sony PlayStation 2
pmax mipsel,mips64el 19931012 Digital Equipment Corp. MIPS based machines
prep powerpc 20000229 PowerPC Reference Platform machines
rs6000 powerpc 20071217 MCA-based IBM RS/6000 wokstations
sandpoint powerpc 20010211 Motorola Sandpoint based NAS systems
sbmips mipseb,mipsel,mips64eb,mips64el 20020306 Broadcom's SiByte processor evaluation boards
sgimips mipseb,mips64eb 20000614 MIPS based Silicon Graphics machines
shark arm 19960131 Digital Network Appliance Reference Design ("Shark")
sparc sparc 19931002 Sun Microsystems SPARC (sun4, sun4c, sun4m) 32 bit machines
sparc64 sparc64/sparc 19980620 Sun Microsystems UltraSPARC 64 bit machines
sun2 m68000 20010328 Sun m68010 based machines
sun3 m68k 19930625 Sun m680[23]0 based machines
vax vax 19940802 Digital Equipment Corp. VAX machines
x68k m68k 19960505 Sharp X68000, X68030
xen xen 20040311 Xen virtual machine monitor
zaurus arm 20061217 Sharp Zaurus C7x0/860/1000/3x00 PDAs
Generic cpu features shared among multiple ports
arm: ARM CPU based platform files
hppa: Hewlett Packard PA-RISC CPU based platform files
m68k: Motorola 680x0 CPU based platform files
mips: MIPS CPU based platform files
powerpc: PowerPC CPU based platform files
sh3: Hitachi SuperH(TM) sh3 and sh4 CPU based platform files
sparc: Sun Microsystems SPARC(TM) CPU based platform files
x86: Intel x86 based platform files.
Generic architectural features shared among multiple ports
hpc: Handheld PC reference platform files
sun68k: Sun Microsystems Motorola 680x0 CPU based platform files
Single port cpu families
alpha: Digital Equipment Alpha processor
ia64: Intel Itanium/Itanium2 processor
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