Annotation of wikisrc/users/jakllsch.mdwn, revision 1.6

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
1.6     ! jakllsch   29: Needs more work and cleanup.
1.2       wiki       30: Work has been done using the OVMF BIOS images for Qemu.
                     31: 
                     32: ### bcm47xx for evbmips
                     33: Boots multiuser on NFS root, needs more work and cleanup.
                     34: 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.
                     35: [[!template id=man name="bce" section="4"]] and [[!template id=man name="bwi" section="4"]] would need refactoring to be bus-independent.
                     36: 
                     37: ### Memory-mapped PCI config access on x86
1.3       jakllsch   38: Needs cleanup, and maybe some more validation of MCFG tables.

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