CVS commit: src/sys/arch/alpha

["Jason R Thorpe" <thorpej%netbsd.org@localhost>]

Module Name:    src
Committed By:   thorpej
Date:           Sat Oct  3 17:31:46 UTC 2020

Modified Files:
        src/sys/arch/alpha/alpha: autoconf.c machdep.c prom.c
        src/sys/arch/alpha/include: alpha.h prom.h

Log Message:
Qemu loads the kernel directly, and so there's no bootloader to provide
a "bootinfo" structure for us.  Qemu does, however, place a Linux kernel
parameter block at kernel_text[] - 0x6000 that contains Linux-style kernel
command line arguments.  So, add a prom_qemu_getenv() that allows us to
look for specific things passed along to the kernel from there, and use
them as follows:

- Support specifying the root device in the forms "root=/dev/wd0a",
  "root=wd0a", or "rootdev=wd0".
- Support SRM-like -flags ... in the form of "flags=AD".  In the case of
  Qemu, we also assume that no flags=... is the same as "flags=A", i.e.
  perform an auto-boot.

Also allow an alternate delay() function to be specified, if the platform
wishes to provide one.


To generate a diff of this commit:
cvs rdiff -u -r1.54 -r1.55 src/sys/arch/alpha/alpha/autoconf.c
cvs rdiff -u -r1.365 -r1.366 src/sys/arch/alpha/alpha/machdep.c
cvs rdiff -u -r1.57 -r1.58 src/sys/arch/alpha/alpha/prom.c
cvs rdiff -u -r1.41 -r1.42 src/sys/arch/alpha/include/alpha.h
cvs rdiff -u -r1.15 -r1.16 src/sys/arch/alpha/include/prom.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.