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Annotation of wikisrc/users/jakllsch.mdwn, revision 1.4

1.2       wiki        1: # Jonathan Kollasch
                      2: 
1.4     ! wiki        3: ## [[!template id=man name="ddb" section="4"]] tips
        !             4: 
        !             5: ### locating a softc
        !             6: This locates a device's softc using it's `cfdriver_t` (e.g. `&mainbus_cd`, `&cpu_cd`) and its "device unit" (e.g. the `0` in `mainbus0`).
        !             7: 
        !             8:     db{0}> call device_lookup_private(ohci_cd, 0)
        !             9:     0xffff800045fb2008
        !            10: 
        !            11: ### locating structure members
        !            12: This uses [[!template id=man name="gdb" section="1"]] and a kernel with debugging symbols to find the offset to a element in a structure.
        !            13: 
        !            14:     $ gdb netbsd.gdb
        !            15:     ...
        !            16:     (gdb) print &((struct ohci_softc *)0)->iot
        !            17:     $3 = (bus_space_tag_t *) 0x478
        !            18:     (gdb) print &((struct ohci_softc *)0)->ioh
        !            19:     $4 = (bus_space_handle_t *) 0x480
        !            20: 
        !            21: ### peeking at mapped registers
        !            22: 
        !            23:     db{0}> call bus_space_read_4(*(ffff800045fb2008+478), *(ffff800045fb2008+480), 0)
        !            24:     0x110
        !            25: 
1.2       wiki       26: ## Unfinished Projects
                     27: 
                     28: ### x86 UEFI kernel loader
                     29: Building this for x64 UEFI requires the `ms_abi` function attribute introduced in GCC 4.4 or so.
                     30: This project uses Intel UEFI headers and some existing FreeBSD work.
                     31: Needs more work and cleanup, also toolchain updates.
                     32: Work has been done using the OVMF BIOS images for Qemu.
                     33: 
                     34: ### bcm47xx for evbmips
                     35: Boots multiuser on NFS root, needs more work and cleanup.
                     36: This project is on hold until there's a miniature userland that fits in 4-8MiB flash storage devices, on a flash-oriented file system.
                     37: [[!template id=man name="bce" section="4"]] and [[!template id=man name="bwi" section="4"]] would need refactoring to be bus-independent.
                     38: 
                     39: ### Conexant PCI DTV driver
                     40: I have some code for 23880-3 and 887 host interfaces.
                     41: This type of hardware is hard to find freely available docs for.
                     42: Tuner/demod drivers from Linux could be ported, but would still be GPLed.
                     43: Probably better to keep these drivers in userland.
                     44: 
                     45: Should try to coordinate with what FreeBSD is doing: <http://wiki.freebsd.org/HDTV>.
                     46: 
                     47: ### Memory-mapped PCI config access on x86
1.3       jakllsch   48: Needs cleanup, and maybe some more validation of MCFG tables.
                     49: 
                     50: ### Toshiba ACPI LCD backlight driver
                     51: Loosly based on [[!template id=man name="vald" section="4"]]. Currently attaches to `TOS1900`/`VALZ`, but doesn't interact with this device.
                     52: This driver should really attach to `\_SB.PCI0.GFX0.LCD` or
                     53: `\_SB.PCI0.PEGP.VGA.LCD`, which are the devices that get notified of
                     54: brightness button pushes, and contain the `_BCL`, `_BCM`, and `_BQC`
                     55: methods that access the brightness adjustment function.
                     56: Such an attachment does not appear to be possible (or at the very least, easy)
                     57: at present.
1.2       wiki       58: 
                     59: ## Possible Projects
                     60: ### AMD PowerNow/Cool'n'Quiet states loaded from ACPI tables
1.3       jakllsch   61: