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target/sparc: Set TCG_GUEST_DEFAULT_MO

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Always use TSO, per the Oracle 2015 manual.
This is slightly less restrictive than the TCG_MO_ALL default,
and happens to match the i386 model, which will eliminate a few
extra barriers on that host.

Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Acked-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-06-20 18:36:33 +02:00
parent d9125cf27c
commit e0f46055a1
1 changed files with 23 additions and 0 deletions
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23
target/sparc/cpu.h
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@ -6,6 +6,29 @@
#include "exec/cpu-defs.h" #include "exec/cpu-defs.h"
#include "qemu/cpu-float.h" #include "qemu/cpu-float.h"
/*
* From Oracle SPARC Architecture 2015:
*
* Compatibility notes: The PSO memory model described in SPARC V8 and
* SPARC V9 compatibility architecture specifications was never implemented
* in a SPARC V9 implementation and is not included in the Oracle SPARC
* Architecture specification.
*
* The RMO memory model described in the SPARC V9 specification was
* implemented in some non-Sun SPARC V9 implementations, but is not
* directly supported in Oracle SPARC Architecture 2015 implementations.
*
* Therefore always use TSO in QEMU.
*
* D.5 Specification of Partial Store Order (PSO)
* ... [loads] are followed by an implied MEMBAR #LoadLoad | #LoadStore.
*
* D.6 Specification of Total Store Order (TSO)
* ... PSO with the additional requirement that all [stores] are followed
* by an implied MEMBAR #StoreStore.
*/
#define TCG_GUEST_DEFAULT_MO (TCG_MO_LD_LD | TCG_MO_LD_ST | TCG_MO_ST_ST)
#if !defined(TARGET_SPARC64) #if !defined(TARGET_SPARC64)
#define TARGET_DPREGS 16 #define TARGET_DPREGS 16
#else #else