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target/ppc: Move 601 hflags adjustment to hreg_compute_hflags

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Keep all hflags computation in one place, as this will be
especially important later.

Introduce a new POWERPC_FLAG_HID0_LE bit to indicate when
LE should be taken from HID0.  This appears to be set if
and only if POWERPC_FLAG_RTC_CLK is set, but we're not
short of bits and having both names will avoid confusion.

Note that this was the only user of hflags_nmsr, so we can
perform a straight assignment rather than mask and set.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210315184615.1985590-3-richard.henderson@linaro.org>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Richard Henderson 2021-03-15 12:46:00 -06:00 committed by David Gibson
parent 8a05fd9a22
commit 1828504672
4 changed files with 18 additions and 9 deletions
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2
target/ppc/cpu.h
View File

@ -581,6 +581,8 @@ enum {
POWERPC_FLAG_TM = 0x00100000,
/* Has SCV (ISA 3.00) */
POWERPC_FLAG_SCV = 0x00200000,
/* Has HID0 for LE bit (601) */
POWERPC_FLAG_HID0_LE = 0x00400000,
};
/*****************************************************************************/

13
target/ppc/helper_regs.c
View File

@ -96,8 +96,17 @@ void hreg_compute_hflags(CPUPPCState *env)
hflags_mask |= (1ULL << MSR_CM) | (1ULL << MSR_SF) | MSR_HVB;
hreg_compute_mem_idx(env);
env->hflags = env->msr & hflags_mask;
/* Merge with hflags coming from other registers */
env->hflags |= env->hflags_nmsr;
if (env->flags & POWERPC_FLAG_HID0_LE) {
/*
* Note that MSR_LE is not set in env->msr_mask for this cpu,
* and so will never be set in msr or hflags at this point.
*/
uint32_t le = extract32(env->spr[SPR_HID0], 3, 1);
env->hflags |= le << MSR_LE;
/* Retain for backward compatibility with migration. */
env->hflags_nmsr = le << MSR_LE;
}
}
void cpu_interrupt_exittb(CPUState *cs)

8
target/ppc/misc_helper.c
View File

@ -194,16 +194,14 @@ void helper_store_hid0_601(CPUPPCState *env, target_ulong val)
target_ulong hid0;
hid0 = env->spr[SPR_HID0];
env->spr[SPR_HID0] = (uint32_t)val;
if ((val ^ hid0) & 0x00000008) {
/* Change current endianness */
env->hflags &= ~(1 << MSR_LE);
env->hflags_nmsr &= ~(1 << MSR_LE);
env->hflags_nmsr |= (1 << MSR_LE) & (((val >> 3) & 1) << MSR_LE);
env->hflags |= env->hflags_nmsr;
hreg_compute_hflags(env);
qemu_log("%s: set endianness to %c => " TARGET_FMT_lx "\n", __func__,
val & 0x8 ? 'l' : 'b', env->hflags);
}
env->spr[SPR_HID0] = (uint32_t)val;
}
void helper_store_403_pbr(CPUPPCState *env, uint32_t num, target_ulong value)

4
target/ppc/translate_init.c.inc
View File

@ -5441,7 +5441,7 @@ POWERPC_FAMILY(601)(ObjectClass *oc, void *data)
pcc->excp_model = POWERPC_EXCP_601;
pcc->bus_model = PPC_FLAGS_INPUT_6xx;
pcc->bfd_mach = bfd_mach_ppc_601;
pcc->flags = POWERPC_FLAG_SE | POWERPC_FLAG_RTC_CLK;
pcc->flags = POWERPC_FLAG_SE | POWERPC_FLAG_RTC_CLK | POWERPC_FLAG_HID0_LE;
}
#define POWERPC_MSRR_601v (0x0000000000001040ULL)
@ -5485,7 +5485,7 @@ POWERPC_FAMILY(601v)(ObjectClass *oc, void *data)
#endif
pcc->bus_model = PPC_FLAGS_INPUT_6xx;
pcc->bfd_mach = bfd_mach_ppc_601;
pcc->flags = POWERPC_FLAG_SE | POWERPC_FLAG_RTC_CLK;
pcc->flags = POWERPC_FLAG_SE | POWERPC_FLAG_RTC_CLK | POWERPC_FLAG_HID0_LE;
}
static void init_proc_602(CPUPPCState *env)