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m68k: improve cpu instantiation comments

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Improvement in comments for the instantiation functions.
This is to highlight what each cpu class, in the 68000 series, contains
in terms of instructions/features.

Signed-off-by: Lucien Murray-Pitts <lucienmp.qemu@gmail.com>
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Message-Id: <2dfe32672ee6ddce4b54c6bcfce579d35abeaf51.1612137712.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 5b19cb63d9
commit ee2fc6c6da
2 changed files with 73 additions and 20 deletions
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44
target/m68k/cpu.c
View File

@ -103,6 +103,7 @@ static void m5206_cpu_initfn(Object *obj)
m68k_set_feature(env, M68K_FEATURE_CF_ISA_A);
}
/* Base feature set, including isns. for m68k family */
static void m68000_cpu_initfn(Object *obj)
{
M68kCPU *cpu = M68K_CPU(obj);
@ -135,6 +136,13 @@ static void m680x0_cpu_common(CPUM68KState *env)
m68k_set_feature(env, M68K_FEATURE_MOVEP);
}
/*
* Adds BFCHG, BFCLR, BFEXTS, BFEXTU, BFFFO, BFINS, BFSET, BFTST, CAS, CAS2,
* CHK2, CMP2, DIVSL, DIVUL, EXTB, PACK, TRAPcc, UNPK.
*
* 68020/30 only:
* CALLM, cpBcc, cpDBcc, cpGEN, cpRESTORE, cpSAVE, cpScc, cpTRAPcc
*/
static void m68020_cpu_initfn(Object *obj)
{
M68kCPU *cpu = M68K_CPU(obj);
@ -144,6 +152,14 @@ static void m68020_cpu_initfn(Object *obj)
m68k_set_feature(env, M68K_FEATURE_M68020);
}
/*
* Adds: PFLUSH (*5)
* 68030 Only: PFLUSHA (*5), PLOAD (*5), PMOVE
* 68030/40 Only: PTEST
*
* NOTES:
* 5. Not valid on MC68EC030
*/
static void m68030_cpu_initfn(Object *obj)
{
M68kCPU *cpu = M68K_CPU(obj);
@ -153,6 +169,23 @@ static void m68030_cpu_initfn(Object *obj)
m68k_set_feature(env, M68K_FEATURE_M68030);
}
/*
* Adds: CINV, CPUSH
* Adds all with Note *2: FABS, FSABS, FDABS, FADD, FSADD, FDADD, FBcc, FCMP,
* FDBcc, FDIV, FSDIV, FDDIV, FMOVE, FSMOVE, FDMOVE,
* FMOVEM, FMUL, FSMUL, FDMUL, FNEG, FSNEG, FDNEG, FNOP,
* FRESTORE, FSAVE, FScc, FSQRT, FSSQRT, FDSQRT, FSUB,
* FSSUB, FDSUB, FTRAPcc, FTST
*
* Adds with Notes *2, and *3: FACOS, FASIN, FATAN, FATANH, FCOS, FCOSH, FETOX,
* FETOXM, FGETEXP, FGETMAN, FINT, FINTRZ, FLOG10,
* FLOG2, FLOGN, FLOGNP1, FMOD, FMOVECR, FREM,
* FSCALE, FSGLDIV, FSGLMUL, FSIN, FSINCOS, FSINH,
* FTAN, FTANH, FTENTOX, FTWOTOX
* NOTES:
* 2. Not applicable to the MC68EC040, MC68LC040, MC68EC060, and MC68LC060.
* 3. These are software-supported instructions on the MC68040 and MC68060.
*/
static void m68040_cpu_initfn(Object *obj)
{
M68kCPU *cpu = M68K_CPU(obj);
@ -162,6 +195,17 @@ static void m68040_cpu_initfn(Object *obj)
m68k_set_feature(env, M68K_FEATURE_M68040);
}
/*
* Adds: PLPA
* Adds all with Note *2: CAS, CAS2, MULS, MULU, CHK2, CMP2, DIVS, DIVU
* All Fxxxx instructions are as per m68040 with exception to; FMOVEM NOTE3
*
* Does NOT implement MOVEP
*
* NOTES:
* 2. Not applicable to the MC68EC040, MC68LC040, MC68EC060, and MC68LC060.
* 3. These are software-supported instructions on the MC68040 and MC68060.
*/
static void m68060_cpu_initfn(Object *obj)
{
M68kCPU *cpu = M68K_CPU(obj);

37
target/m68k/cpu.h
View File

@ -450,39 +450,48 @@ void m68k_switch_sp(CPUM68KState *env);
void do_m68k_semihosting(CPUM68KState *env, int nr);
/*
* The 68000 family is defined in six main CPU classes, the 680[012346]0.
* Generally each successive CPU adds enhanced data/stack/instructions.
* However, some features are only common to one, or a few classes.
* The features covers those subsets of instructons.
*
* CPU32/32+ are basically 680010 compatible with some 68020 class instructons,
* and some additional CPU32 instructions. Mostly Supervisor state differences.
*
* The ColdFire core ISA is a RISC-style reduction of the 68000 series cpu.
* There are 4 ColdFire core ISA revisions: A, A+, B and C.
* Each feature covers the subset of instructions common to the
* ISA revisions mentioned.
*/
enum m68k_features {
M68K_FEATURE_M68000,
M68K_FEATURE_M68000, /* Base m68k instruction set */
M68K_FEATURE_M68020,
M68K_FEATURE_M68030,
M68K_FEATURE_M68040,
M68K_FEATURE_M68060,
M68K_FEATURE_CF_ISA_A,
M68K_FEATURE_CF_ISA_A, /* Base Coldfire set Rev A. */
M68K_FEATURE_CF_ISA_B, /* (ISA B or C). */
M68K_FEATURE_CF_ISA_APLUSC, /* BIT/BITREV, FF1, STRLDSR (ISA A+ or C). */
M68K_FEATURE_BRAL, /* Long unconditional branch. (ISA A+ or B). */
M68K_FEATURE_BRAL, /* BRA with Long branch. (680[2346]0, ISA A+ or B). */
M68K_FEATURE_CF_FPU,
M68K_FEATURE_CF_MAC,
M68K_FEATURE_CF_EMAC,
M68K_FEATURE_CF_EMAC_B, /* Revision B EMAC (dual accumulate). */
M68K_FEATURE_USP, /* User Stack Pointer. (ISA A+, B or C). */
M68K_FEATURE_USP, /* User Stack Pointer. (680[012346]0, ISA A+, B or C).*/
M68K_FEATURE_EXT_FULL, /* 68020+ full extension word. */
M68K_FEATURE_WORD_INDEX, /* word sized address index registers. */
M68K_FEATURE_SCALED_INDEX, /* scaled address index registers. */
M68K_FEATURE_LONG_MULDIV, /* 32 bit multiply/divide. */
M68K_FEATURE_QUAD_MULDIV, /* 64 bit multiply/divide. */
M68K_FEATURE_BCCL, /* Long conditional branches. */
M68K_FEATURE_BITFIELD, /* Bit field insns. */
M68K_FEATURE_FPU,
M68K_FEATURE_CAS,
M68K_FEATURE_BKPT,
M68K_FEATURE_RTD,
M68K_FEATURE_CHK2,
M68K_FEATURE_MOVEP,
M68K_FEATURE_LONG_MULDIV, /* 32 bit mul/div. (680[2346]0, and CPU32) */
M68K_FEATURE_QUAD_MULDIV, /* 64 bit mul/div. (680[2346]0, and CPU32) */
M68K_FEATURE_BCCL, /* Bcc with Long branches. (680[2346]0, and CPU32) */
M68K_FEATURE_BITFIELD, /* BFxxx Bit field insns. (680[2346]0) */
M68K_FEATURE_FPU, /* fpu insn. (680[46]0) */
M68K_FEATURE_CAS, /* CAS/CAS2[WL] insns. (680[2346]0) */
M68K_FEATURE_BKPT, /* BKPT insn. (680[12346]0, and CPU32) */
M68K_FEATURE_RTD, /* RTD insn. (680[12346]0, and CPU32) */
M68K_FEATURE_CHK2, /* CHK2 insn. (680[2346]0, and CPU32) */
M68K_FEATURE_MOVEP, /* MOVEP insn. (680[01234]0, and CPU32) */
};
static inline int m68k_feature(CPUM68KState *env, int feature)