Ph03n1ks has quit [Remote host closed the connection]
doggkruse has quit [Quit: My MacBook has gone to sleep. ZZZzzz…]
doggkruse has joined #asahi-re
Ph03n1ks has joined #asahi-re
doggkruse has quit [Quit: My MacBook has gone to sleep. ZZZzzz…]
<
rqou_>
note that this is hardware revision 1.0, and the actual M2 may have yet another new version of this DART interface
<
nicolas17>
rqou_: did you figure it out by blackbox testing or reversing Apple's kernel?
<
rqou_>
mix of both
<
nicolas17>
you could decompile A15 kernels if you're curious about the future hw :)
<
rqou_>
oh, the code is available, just the hardware behavior wouldn't be
<
rqou_>
unless someone wants to hand me a research jailbreak on an a15
<
rqou_>
possibly even requiring a PPL bypass
Ph03n1ks has quit [Remote host closed the connection]
chadmed has joined #asahi-re
akemin_dayo has joined #asahi-re
Ph03n1ks has joined #asahi-re
Ph03n1ks has quit [Read error: Connection reset by peer]
Ph03n1ks has joined #asahi-re
bisko has quit [Read error: Connection reset by peer]
bisko has joined #asahi-re
Ph03n1ks has quit [Remote host closed the connection]
Ph03n1ks has joined #asahi-re
Ph03n1ks has quit [Ping timeout: 480 seconds]
Ph03n1ks has joined #asahi-re
Ph03n1ks has quit [Ping timeout: 480 seconds]
Ph03n1ks has joined #asahi-re
PhilippvK has joined #asahi-re
phiologe has quit [Ping timeout: 480 seconds]
Ph03n1ks has quit [Remote host closed the connection]
bisko has quit [Read error: Connection reset by peer]
Ph03n1ks has joined #asahi-re
doggkruse has joined #asahi-re
bisko has joined #asahi-re
Ph03n1ks has quit [Ping timeout: 480 seconds]
Ph03n1ks has joined #asahi-re
doggkruse has quit [Quit: My MacBook has gone to sleep. ZZZzzz…]
Ph03n1ks has quit [Ping timeout: 480 seconds]
Ph03n1ks has joined #asahi-re
Ph03n1ks has quit [Remote host closed the connection]
Ph03n1ks has joined #asahi-re
doggkruse has joined #asahi-re
Ph03n1ks has quit [Remote host closed the connection]
Ph03n1ks has joined #asahi-re
<
rqou_>
uhh the linux DART driver doesn't try to set PTE bit 1 (SP_PROT_DIS) does it? because on t6000 that bit does something completely different
<
rqou_>
according to the symbols, it flags the page as uncacheable
bisko has quit [Read error: Connection reset by peer]
bisko has joined #asahi-re
<
jannau>
rqou_: the common io-pgtable-arm.c used by the dart driver sets that bit
<
rqou_>
uhh where? can we make it not do that?
<
jannau>
search for ARM_LPAE_PTE_TYPE_PAGE
<
rqou_>
Someone(TM) should maybe investigate/fix that?
<
rqou_>
idk if the bit actually works
<
jannau>
I don't think we can change it to not set that code, we would hvae to copy it and make it dart specific
doggkruse has quit [Quit: My MacBook has gone to sleep. ZZZzzz…]
<
jannau>
it's possible to not set that bit for testing locally
<
jannau>
or maybe we can, just extend the 'fmt != ARM_MALI_LPAE' with 'fmt != APPLE_DART'
<
rqou_>
idk, i'm not really a good kernel dev
<
rqou_>
at some point should investigate whether or not that bit actually makes the page not be cached (presumably in the DART TLB?)
<
rqou_>
unrelatedly, does anybody know how to fix ghidra's varargs ABI?
Ph03n1ks has quit [Remote host closed the connection]
doggkruse has joined #asahi-re
the_lanetly_052 has joined #asahi-re
doggkruse has quit [Quit: My MacBook has gone to sleep. ZZZzzz…]
chadmed has quit [Remote host closed the connection]
<
sven>
uh, uncacheable might also mean that access to that page bypasses all caches
<
sven>
which wouldn't be great if we accidentally set that for all pages :D
bisko has quit [Read error: Connection reset by peer]
bisko has joined #asahi-re
chadmed has joined #asahi-re
nicolas17 has quit [Ping timeout: 480 seconds]
<
rqou_>
this only affects iommu pages, but yes
<
rqou_>
idk if it bypasses all caches or just the iommu TLB
chadmed has quit [Remote host closed the connection]
chadmed has joined #asahi-re
chadmed has quit [Remote host closed the connection]
chadmed has joined #asahi-re
MajorBiscuit has joined #asahi-re
Ph03n1ks has joined #asahi-re
Ph03n1ks has quit []
chadmed has quit [Ping timeout: 480 seconds]
bisko has quit [Read error: Connection reset by peer]
bisko has joined #asahi-re
MajorBiscuit has quit [Ping timeout: 480 seconds]
<
sven>
I’ve never seen a bit to indicate “don’t add this to the tlb” but “accesses to this page bypasses all caches” is pretty common
herbas has joined #asahi-re
MajorBiscuit has joined #asahi-re
<
rqou_>
btw, why doesn't attempting to turn on dart-apcieN work?
<
rqou_>
>>> p.pmgr_adt_clocks_enable(f'/arm-io/dart-apciec0')
<
rqou_>
TTY> pmgr: Error getting /arm-io/dart-apciec0 clock-gates.
<
rqou_>
0xffffffffffffffff
<
jannau>
the clock-gates are in '/arm-io/apciec0' and not in the dart node
<
rqou_>
hmm, then i get 0xffffffff trying to read any of the DART registers
<
rqou_>
(i'm just trying to check the parameter registers to see if they're very different or not)
MajorBiscuit has quit [Ping timeout: 480 seconds]
<
sven>
that's more complex
<
sven>
getting the thunderbolt DART up requires ATCPHY to be up and that CIO co-processor to be running as well
<
sven>
technically it only requires you to poke some "thunderbolt clock" or something that's different from the normal PMGR stuff
<
sven>
but if you do that without ATCPHY or handling that CIO co-processor you get ~2 seconds until the entire SoC reboots
bisko has quit [Read error: Connection reset by peer]
bisko has joined #asahi-re
<
rqou_>
even if i just want to read register 0?
<
rqou_>
ok, i'll look at this some other time
amarioguy has joined #asahi-re
<
sven>
the easiest way is probably to run macOS, connect some thunderbolt device and then break in the hypervisor and read it from there
<
rqou_>
not sure i even own any thunderbolt devices
amarioguy has quit [Remote host closed the connection]
kameks has joined #asahi-re
bisko has quit [Read error: Connection reset by peer]
alyssa has quit [Quit: leaving]
bisko has joined #asahi-re
herbas has quit [Quit: herbas]
the_lanetly_052 has quit [Ping timeout: 480 seconds]
MajorBiscuit has joined #asahi-re
bisko has quit [Read error: Connection reset by peer]
bisko has joined #asahi-re
kameks has quit [Ping timeout: 480 seconds]
nicolas17 has joined #asahi-re
bisko has quit [Read error: Connection reset by peer]
bisko has joined #asahi-re
doggkruse has joined #asahi-re
Misthios has quit [Quit: Misthios]
Misthios has joined #asahi-re
bisko has quit [Quit: My MacBook has gone to sleep. ZZZzzz…]
bisko has joined #asahi-re
MajorBiscuit has quit [Ping timeout: 480 seconds]
bisko has quit [Read error: Connection reset by peer]
bisko has joined #asahi-re
Shiz has quit [Ping timeout: 480 seconds]
bisko has quit [Quit: My MacBook has gone to sleep. ZZZzzz…]
bisko has joined #asahi-re
bisko has quit [Read error: Connection reset by peer]
bisko has joined #asahi-re
yrlf has joined #asahi-re
yusoofsh[m] has left #asahi-re [#asahi-re]