CVS commit: src/sys/dev/arcbios

Module Name:	src
Committed By:	adrian
Date:		Sun May  3 23:06:13 UTC 2026

Modified Files:
	src/sys/dev/arcbios: arcbios_calls.S

Log Message:
arcbios: enable FPU around ARCS calls

This seems required for the SGI O2 for PROM graphics console IO to work
when it scrolls.  See PR port-sgimips/60204 for more details.

The issue was introduced in v1.214 of sys/arch/mips/mips/locore.S .

Notably maya@ disabled the FPU early in boot, expecting the rest of
boot to run with the FPU disabled. The FPU is being explicitly
enabled/disabled here to keep to the spirit of maya@'s above commit.

A "better" solution would be to use the pcu API and mark the thread
as needing the FPU for the duration of the arcbios call, however:

 * The current MIPS pcu FPU code in sys/arch/mips/mips/mips_fpu.c
   doesn't support FPU use in kernel yet; and
 * this stuff is called super early during boot and once the OS starts
   the ARCBIOS API is no longer supposed to be used.


To generate a diff of this commit:
cvs rdiff -u -r1.6 -r1.7 src/sys/dev/arcbios/arcbios_calls.S

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