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target/m68k: only change valid bits in CACR

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This is used by netBSD (and MacOS ROM) to detect the MMU type

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Thomas Huth <huth@tuxfamily.org>
Message-Id: <20191220172415.35838-1-laurent@vivier.eu>
[lv: add a comment before m680x0_cpu_common()]
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Laurent Vivier 2019-12-20 18:24:15 +01:00
parent e24e58e8ac
commit 18b6102e51
3 changed files with 36 additions and 9 deletions
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12
target/m68k/helper.c
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@ -203,9 +203,17 @@ void HELPER(m68k_movec_to)(CPUM68KState *env, uint32_t reg, uint32_t val)
case M68K_CR_VBR:
env->vbr = val;
return;
/* MC680[234]0 */
/* MC680[2346]0 */
case M68K_CR_CACR:
env->cacr = val;
if (m68k_feature(env, M68K_FEATURE_M68020)) {
env->cacr = val & 0x0000000f;
} else if (m68k_feature(env, M68K_FEATURE_M68030)) {
env->cacr = val & 0x00003f1f;
} else if (m68k_feature(env, M68K_FEATURE_M68040)) {
env->cacr = val & 0x80008000;
} else if (m68k_feature(env, M68K_FEATURE_M68060)) {
env->cacr = val & 0xf8e0e000;
}
m68k_switch_sp(env);
return;
/* MC680[34]0 */