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target-ppc: Add POWER8's FSCR SPR

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This adds an FSCR (Facility Status and Control Register) SPR. This defines
names for FSCR bits.

This defines new exception type - POWERPC_EXCP_FU - "facility unavailable" (FU).
This registers an interrupt vector for it at 0xF60 as PowerISA defines.

This adds a TCG helper_fscr_facility_check() helper to raise an exception
if the facility is not enabled. It updates the interrupt cause field
in FSCR. This adds a TCG translation block generation code. The helper
may be used for HFSCR too as it has the same format.

The helper raising FU exceptions is not used by this patch but will be
in the next ones.

This adds gen_update_current_nip() to update NIP in DisasContext.
This helper is not used now and will be called before checking for
a condition for throwing an FU exception.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: Tom Musta <tommusta@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexey Kardashevskiy 2014-06-04 22:50:56 +10:00 • committed by Alexander Graf
parent d1a721ab81
commit 7019cb3d88
6 changed files with 66 additions and 0 deletions
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27
target-ppc/misc_helper.c
View file

@ -34,6 +34,33 @@ void helper_store_dump_spr(CPUPPCState *env, uint32_t sprn)
qemu_log("Write SPR %d %03x <= " TARGET_FMT_lx "\n", sprn, sprn,
env->spr[sprn]);
}
#ifdef TARGET_PPC64
static void raise_fu_exception(CPUPPCState *env, uint32_t bit,
uint32_t sprn, uint32_t cause)
{
qemu_log("Facility SPR %d is unavailable (SPR FSCR:%d)\n", sprn, bit);
env->spr[SPR_FSCR] &= ~((target_ulong)FSCR_IC_MASK << FSCR_IC_POS);
cause &= FSCR_IC_MASK;
env->spr[SPR_FSCR] |= (target_ulong)cause << FSCR_IC_POS;
helper_raise_exception_err(env, POWERPC_EXCP_FU, 0);
}
#endif
void helper_fscr_facility_check(CPUPPCState *env, uint32_t bit,
uint32_t sprn, uint32_t cause)
{
#ifdef TARGET_PPC64
if (env->spr[SPR_FSCR] & (1ULL << bit)) {
/* Facility is enabled, continue */
return;
}
raise_fu_exception(env, bit, sprn, cause);
#endif
}
#if !defined(CONFIG_USER_ONLY)
void helper_store_sdr1(CPUPPCState *env, target_ulong val)