#asahi-re on 2022-01-20 — irc logs at oftc.irclog.whitequark.org

2021-07-26 22:57 ChanServ changed the topic of #asahi-re to: Asahi Linux: porting Linux to Apple Silicon macs | Hardware / boot process / firmware interface reverse engineering | WARNING: this channel (only) may contain binary reverse engineering discussion | RE policy: https://alx.sh/re (MANDATORY READ) | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Logs: https://alx.sh/l/asahi-re

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03:15 <TaherAli[m]> i'm trying to figure out how the boot loader renders an image on boot process. here's the apple logo: https://opensource.apple.com/source/BootX/BootX-81/bootx.tproj/sl.subproj/appleboot.h.auto.html

03:16 TaherAli[m] is now known as null-nop[m]

03:17 <null-nop[m]> in display.c file i see it looks up color index from CLUT

03:17 <null-nop[m]> is it possible to interpret the logo's pixel and colors as-is on the desktop?

03:17 <null-nop[m]> perhaps will need gfx api? metal?

03:18 <null-nop[m]> cc marcan

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04:19 <marcan> null-nop[m]: that code has nothing to do with M1s. BootX is for PowerPC Macs.

04:19 <marcan> I'm not sure exactly what you want to do

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05:18 <null-nop[m]> https://github.com/apple/darwin-xnu/blob/main/pexpert/pexpert/AppleBoot.h#L42 - even this is related to PowerPC?

05:20 <null-nop[m]> im trying to render `gAppleBootPict`

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08:02 <marcan> null-nop[m]: that file seems to be unused

08:02 <marcan> where are you trying to render it and how?

08:04 <marcan> if you're looking for the actual Apple logo used by iBoot, it's in ipsw updates, e.g. Firmware/all_flash/applelogo@1x~mac-USBc.im4p, in a custom format

08:04 <marcan> you can extract the im4p with img4tool and the image with something like https://github.com/realnp/ibootim

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08:07 <marcan> if you just want the Apple logo back while running m1n1, just do p.fb_restore_logo() or p.fb_shutdown(True)

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11:13 <marcan> so I managed to pull the field diagnostics image from Apple's CDN (normally loads only in field diags mode, but the loader is in the recovery mode image of course)

11:13 <marcan> // CRFDR

11:13 <marcan> // CoreRepairKit

11:14 <marcan> was not expecting to see *headers* in here

11:14 <marcan> #if !RC_HIDE_D16 || !RC_HIDE_D17 || !RC_HIDE_D63 || !RC_HIDE_D64

11:14 <marcan> #define kPearlRepairSPC @"IPHONE COMP FACEID"

11:14 <marcan> #endif

11:14 <marcan> heh

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11:21 <marcan> lol the lua files and json files are encrypted?

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12:00 <Jamie[m]1> lolwut

12:43 <Jamie[m]1> "FieldDiagsGoblin"

12:43 <Jamie[m]1> what is goblin the codename for lmao

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15:45 <null-nop[m]> ah thanks

15:45 <null-nop[m]> ive been deep reading about the whole macho, iokit, xnu

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15:50 <null-nop[m]> whenever i see a .o file i think of it as an exec and forget a macho exec doesn't usually have an extension name

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