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target/m68k: only change valid bits in CACR 

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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28
target/m68k/cpu.c
View File

@ -114,11 +114,9 @@ static void m68000_cpu_initfn(Object *obj)
m68k_set_feature(env, M68K_FEATURE_MOVEP);
}
static void m68020_cpu_initfn(Object *obj)
/* common features for 68020, 68030 and 68040 */
static void m680x0_cpu_common(CPUM68KState *env)
{
M68kCPU *cpu = M68K_CPU(obj);
CPUM68KState *env = &cpu->env;
m68k_set_feature(env, M68K_FEATURE_M68000);
m68k_set_feature(env, M68K_FEATURE_USP);
m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
@ -136,14 +134,31 @@ static void m68020_cpu_initfn(Object *obj)
m68k_set_feature(env, M68K_FEATURE_CHK2);
m68k_set_feature(env, M68K_FEATURE_MOVEP);
}
#define m68030_cpu_initfn m68020_cpu_initfn
static void m68020_cpu_initfn(Object *obj)
{
M68kCPU *cpu = M68K_CPU(obj);
CPUM68KState *env = &cpu->env;
m680x0_cpu_common(env);
m68k_set_feature(env, M68K_FEATURE_M68020);
}
static void m68030_cpu_initfn(Object *obj)
{
M68kCPU *cpu = M68K_CPU(obj);
CPUM68KState *env = &cpu->env;
m680x0_cpu_common(env);
m68k_set_feature(env, M68K_FEATURE_M68030);
}
static void m68040_cpu_initfn(Object *obj)
{
M68kCPU *cpu = M68K_CPU(obj);
CPUM68KState *env = &cpu->env;
m68020_cpu_initfn(obj);
m680x0_cpu_common(env);
m68k_set_feature(env, M68K_FEATURE_M68040);
}
@ -166,6 +181,7 @@ static void m68060_cpu_initfn(Object *obj)
m68k_set_feature(env, M68K_FEATURE_BKPT);
m68k_set_feature(env, M68K_FEATURE_RTD);
m68k_set_feature(env, M68K_FEATURE_CHK2);
m68k_set_feature(env, M68K_FEATURE_M68060);
}
static void m5208_cpu_initfn(Object *obj)

5
target/m68k/cpu.h
View File

@ -460,6 +460,10 @@ void do_m68k_semihosting(CPUM68KState *env, int nr);
enum m68k_features {
M68K_FEATURE_M68000,
M68K_FEATURE_M68020,
M68K_FEATURE_M68030,
M68K_FEATURE_M68040,
M68K_FEATURE_M68060,
M68K_FEATURE_CF_ISA_A,
M68K_FEATURE_CF_ISA_B, /* (ISA B or C). */
M68K_FEATURE_CF_ISA_APLUSC, /* BIT/BITREV, FF1, STRLDSR (ISA A+ or C). */
@ -481,7 +485,6 @@ enum m68k_features {
M68K_FEATURE_BKPT,
M68K_FEATURE_RTD,
M68K_FEATURE_CHK2,
M68K_FEATURE_M68040, /* instructions specific to MC68040 */
M68K_FEATURE_MOVEP,
};

12
target/m68k/helper.c
View File

@ -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 */