Hi Jason,
On Mon, Feb 14, 2022 at 3:05 PM Jason A. Donenfeld <Jason@xxxxxxxxx> wrote:
On Sun, Feb 13, 2022 at 12:06 AM Joshua Kinard <kumba@xxxxxxxxxx> wrote:
The R6000/R6000A CPU only ever existed in systems in the late 1980's that
were fairly large, and I don't think there is a complete, working unit out
there that can actually boot up, let alone boot a Linux kernel.
So from what you've written, it sounds like MIPS is actually not a problem here.
So the only systems we're actually talking about without a good cycle
counter are non-Amiga m68k? If so, that'd be a pretty terrific
finding. It'd mean that this idea can move forward, and we only need
to worry about some m68k museum pieces with misconfigured
userspaces...
I'm afraid you missed one important detail. You wrote:
On every platform, random_get_entropy() is connected to get_cycles(),
except for three: m68k, MIPS, and RISC-V.
The default implementation in include/asm-generic/timex.h is:
static inline cycles_t get_cycles(void)
{
return 0;
}
Several architectures do not implement get_cycles(), or implement it
with a variant that's very similar or identical to the generic version.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
