Early in boot, we need to create the normal stdin/out/err env for the
boot loader to run in. To do that, we need to open the console and
duplicate the file descriptors which requires dup(2). Implement a
wrapper as host_dup.
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Linux's /dev/fd is implemented inside of /proc/self/fd, so we may need
to create a symlink to it early in boot. "/dev/fd" and "/dev/std*" might
not be strictly required for the boot loader, but should be present for
maximum flexibility.
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Add host_getpid() so we can know if we're running as init(8) or not. If
we are, we may chose to do early system setup / sanity operations.
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Implement stat(2) and fstat(2) in terms of newfstatat and newfstat
system calls respectively (assume we have a compat #define when
there's no newfstat and just a regular fstat and do so for ppc).
Snag struct kstat (the Linux kernel stat(2), et al interface) from musl
and attribute properly.
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Add the common O_ constants for the open, fcntl, etc system calls. They
are different than FreeBSD's. While they can differ based on
architecture, they are constant for architectures we care about, and
those architectures use the 'generic' version so future architectures
will also work.
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Just have the MD code provide syscall and have generic code for the
rest.
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Differential Revision: https://reviews.freebsd.org/D33515
As the first step at making this more generic, move kboot to top level.
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Reviewed by: luporl, tsoome
Differential Revision: https://reviews.freebsd.org/D33513
