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ppc: Add stub implementation of TRIG SPRs

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Linux sets these to control cache flush behaviour on Power9. Supervisor
and hypervisor are allowed to write, and reads are noops.

Add implementations to avoid noisy messages when booting Linux under the
pseries machine with guest_errors enabled.

Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
Joel Stanley 2023-07-19 14:59:20 +09:30 • committed by Cédric Le Goater
parent 0fdf05d774
commit 99837aa88c
2 changed files with 12 additions and 0 deletions
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10
target/ppc/cpu_init.c
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@ -5660,6 +5660,16 @@ static void register_power_common_book4_sprs(CPUPPCState *env)
SPR_NOACCESS, SPR_NOACCESS,
&spr_read_tfmr, &spr_write_tfmr,
0x00000000);
spr_register_hv(env, SPR_TRIG1, "TRIG1",
SPR_NOACCESS, SPR_NOACCESS,
&spr_access_nop, &spr_write_generic,
&spr_access_nop, &spr_write_generic,
0x00000000);
spr_register_hv(env, SPR_TRIG2, "TRIG2",
SPR_NOACCESS, SPR_NOACCESS,
&spr_access_nop, &spr_write_generic,
&spr_access_nop, &spr_write_generic,
0x00000000);
#endif
}