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target/ppc: Implement attn instruction on BookS 64-bit processors

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attn is an implementation-specific instruction that on POWER (and G5/
970) can be enabled with a HID bit (disabled = illegal), and executing
it causes the host processor to stop and the service processor to be
notified. Generally used for debugging.

Implement attn and make it checkstop the system, which should be good
enough for QEMU debugging.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
This commit is contained in:
Nicholas Piggin 2023-06-18 19:39:13 +10:00
parent 9728fb5c22
commit 45693f94dd
6 changed files with 130 additions and 9 deletions
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12
target/ppc/cpu.h
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@ -1375,6 +1375,9 @@ struct CPUArchState {
/* Power management */
int (*check_pow)(CPUPPCState *env);
/* attn instruction enable */
int (*check_attn)(CPUPPCState *env);
#if !defined(CONFIG_USER_ONLY)
void *load_info; /* holds boot loading state */
#endif
@ -1523,6 +1526,7 @@ struct PowerPCCPUClass {
int n_host_threads;
void (*init_proc)(CPUPPCState *env);
int (*check_pow)(CPUPPCState *env);
int (*check_attn)(CPUPPCState *env);
};
ObjectClass *ppc_cpu_class_by_name(const char *name);
@ -2320,6 +2324,8 @@ void ppc_compat_add_property(Object *obj, const char *name,
#define HID0_NAP (1 << 22) /* pre-2.06 */
#define HID0_HILE PPC_BIT(19) /* POWER8 */
#define HID0_POWER9_HILE PPC_BIT(4)
#define HID0_ENABLE_ATTN PPC_BIT(31) /* POWER8 */
#define HID0_POWER9_ENABLE_ATTN PPC_BIT(3)
/*****************************************************************************/
/* PowerPC Instructions types definitions */
@ -3025,6 +3031,12 @@ static inline int check_pow_nocheck(CPUPPCState *env)
return 1;
}
/* attn enable check */
static inline int check_attn_none(CPUPPCState *env)
{
return 0;
}
/*****************************************************************************/
/* PowerPC implementations definitions */