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m68k: cascade m68k_features by m680xx_cpu_initfn() to improve readability

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The m680XX_cpu_initfn functions have been rearranged to cascade starting from
the base 68000, so that the 68010 then inherits from this, and so on until the
68060.

This makes it simpler to track features since in most cases the m68k were
product enhancements on each other, with only a few instructions being retired.

Because each cpu class inherits the previous CPU class, then for example
the 68020 also has the feature 68010, and 68000 and so on upto the 68060.

- Added 68010 cpu class, and moved correct features into 68000/68010.
- Added m68k_unset_feature to allow removing a feature in the inheritence

Signed-off-by: Lucien Murray-Pitts <lucienmp.qemu@gmail.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-Id: <c652fe7537f8b4fe87a13ecbbc0ea751fb71532f.1612137712.git.balaton@eik.bme.hu>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Lucien Murray-Pitts 2021-02-01 01:01:52 +01:00 committed by Laurent Vivier
parent ee2fc6c6da
commit 4ecce5fb52
2 changed files with 39 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
target/m68k/cpu.c
View File

@ -41,6 +41,11 @@ static void m68k_set_feature(CPUM68KState *env, int feature)
env->features |= (1u << feature);
}
static void m68k_unset_feature(CPUM68KState *env, int feature)
{
env->features &= (-1u - (1u << feature));
}
static void m68k_cpu_reset(DeviceState *dev)
{
CPUState *s = CPU(dev);
@ -115,25 +120,18 @@ static void m68000_cpu_initfn(Object *obj)
m68k_set_feature(env, M68K_FEATURE_MOVEP);
}
/* common features for 68020, 68030 and 68040 */
static void m680x0_cpu_common(CPUM68KState *env)
/*
* Adds BKPT, MOVE-from-SR *now priv instr, and MOVEC, MOVES, RTD
*/
static void m68010_cpu_initfn(Object *obj)
{
m68k_set_feature(env, M68K_FEATURE_M68000);
m68k_set_feature(env, M68K_FEATURE_USP);
m68k_set_feature(env, M68K_FEATURE_WORD_INDEX);
m68k_set_feature(env, M68K_FEATURE_QUAD_MULDIV);
m68k_set_feature(env, M68K_FEATURE_BRAL);
m68k_set_feature(env, M68K_FEATURE_BCCL);
m68k_set_feature(env, M68K_FEATURE_BITFIELD);
m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
m68k_set_feature(env, M68K_FEATURE_SCALED_INDEX);
m68k_set_feature(env, M68K_FEATURE_LONG_MULDIV);
m68k_set_feature(env, M68K_FEATURE_FPU);
m68k_set_feature(env, M68K_FEATURE_CAS);
m68k_set_feature(env, M68K_FEATURE_BKPT);
M68kCPU *cpu = M68K_CPU(obj);
CPUM68KState *env = &cpu->env;
m68000_cpu_initfn(obj);
m68k_set_feature(env, M68K_FEATURE_M68010);
m68k_set_feature(env, M68K_FEATURE_RTD);
m68k_set_feature(env, M68K_FEATURE_CHK2);
m68k_set_feature(env, M68K_FEATURE_MOVEP);
m68k_set_feature(env, M68K_FEATURE_BKPT);
}
/*
@ -148,8 +146,19 @@ static void m68020_cpu_initfn(Object *obj)
M68kCPU *cpu = M68K_CPU(obj);
CPUM68KState *env = &cpu->env;
m680x0_cpu_common(env);
m68010_cpu_initfn(obj);
m68k_unset_feature(env, M68K_FEATURE_M68010);
m68k_set_feature(env, M68K_FEATURE_M68020);
m68k_set_feature(env, M68K_FEATURE_QUAD_MULDIV);
m68k_set_feature(env, M68K_FEATURE_BRAL);
m68k_set_feature(env, M68K_FEATURE_BCCL);
m68k_set_feature(env, M68K_FEATURE_BITFIELD);
m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
m68k_set_feature(env, M68K_FEATURE_SCALED_INDEX);
m68k_set_feature(env, M68K_FEATURE_LONG_MULDIV);
m68k_set_feature(env, M68K_FEATURE_FPU);
m68k_set_feature(env, M68K_FEATURE_CAS);
m68k_set_feature(env, M68K_FEATURE_CHK2);
}
/*
@ -165,7 +174,8 @@ static void m68030_cpu_initfn(Object *obj)
M68kCPU *cpu = M68K_CPU(obj);
CPUM68KState *env = &cpu->env;
m680x0_cpu_common(env);
m68020_cpu_initfn(obj);
m68k_unset_feature(env, M68K_FEATURE_M68020);
m68k_set_feature(env, M68K_FEATURE_M68030);
}
@ -191,7 +201,8 @@ static void m68040_cpu_initfn(Object *obj)
M68kCPU *cpu = M68K_CPU(obj);
CPUM68KState *env = &cpu->env;
m680x0_cpu_common(env);
m68030_cpu_initfn(obj);
m68k_unset_feature(env, M68K_FEATURE_M68030);
m68k_set_feature(env, M68K_FEATURE_M68040);
}
@ -211,21 +222,13 @@ static void m68060_cpu_initfn(Object *obj)
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);
m68k_set_feature(env, M68K_FEATURE_BRAL);
m68k_set_feature(env, M68K_FEATURE_BCCL);
m68k_set_feature(env, M68K_FEATURE_BITFIELD);
m68k_set_feature(env, M68K_FEATURE_EXT_FULL);
m68k_set_feature(env, M68K_FEATURE_SCALED_INDEX);
m68k_set_feature(env, M68K_FEATURE_LONG_MULDIV);
m68k_set_feature(env, M68K_FEATURE_FPU);
m68k_set_feature(env, M68K_FEATURE_CAS);
m68k_set_feature(env, M68K_FEATURE_BKPT);
m68k_set_feature(env, M68K_FEATURE_RTD);
m68k_set_feature(env, M68K_FEATURE_CHK2);
m68040_cpu_initfn(obj);
m68k_unset_feature(env, M68K_FEATURE_M68040);
m68k_set_feature(env, M68K_FEATURE_M68060);
m68k_unset_feature(env, M68K_FEATURE_MOVEP);
/* Implemented as a software feature */
m68k_unset_feature(env, M68K_FEATURE_QUAD_MULDIV);
}
static void m5208_cpu_initfn(Object *obj)
@ -577,6 +580,7 @@ static const TypeInfo m68k_cpus_type_infos[] = {
.class_init = m68k_cpu_class_init,
},
DEFINE_M68K_CPU_TYPE_M68K(m68000),
DEFINE_M68K_CPU_TYPE_M68K(m68010),
DEFINE_M68K_CPU_TYPE_M68K(m68020),
DEFINE_M68K_CPU_TYPE_M68K(m68030),
DEFINE_M68K_CPU_TYPE_M68K(m68040),

1
target/m68k/cpu.h
View File

@ -466,6 +466,7 @@ void do_m68k_semihosting(CPUM68KState *env, int nr);
enum m68k_features {
M68K_FEATURE_M68000, /* Base m68k instruction set */
M68K_FEATURE_M68010,
M68K_FEATURE_M68020,
M68K_FEATURE_M68030,
M68K_FEATURE_M68040,