diff options
| author | Pavel Pisa <pisa@cmp.felk.cvut.cz> | 2019-02-04 13:19:10 +0100 |
|---|---|---|
| committer | Pavel Pisa <pisa@cmp.felk.cvut.cz> | 2019-02-04 13:19:10 +0100 |
| commit | 11e55482f80e5bf7df19f845c2d4faf5a9a6010c (patch) | |
| tree | ed6e21378212c2386c976367200584ea8c46f8e2 | |
| parent | fed3a4f559984ec77961f6d5556e183db6f41a2d (diff) | |
| download | qtmips-11e55482f80e5bf7df19f845c2d4faf5a9a6010c.tar.gz qtmips-11e55482f80e5bf7df19f845c2d4faf5a9a6010c.tar.bz2 qtmips-11e55482f80e5bf7df19f845c2d4faf5a9a6010c.zip | |
Primitive implementation of cache instruction.
When any variant of cache instruction is detected
flush and invalidate whole data cache.
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
| -rw-r--r-- | qtmips_machine/core.cpp | 6 | ||||
| -rw-r--r-- | qtmips_machine/instruction.cpp | 2 | ||||
| -rw-r--r-- | qtmips_machine/memory.h | 3 |
3 files changed, 7 insertions, 4 deletions
diff --git a/qtmips_machine/core.cpp b/qtmips_machine/core.cpp index 2850e32..839def2 100644 --- a/qtmips_machine/core.cpp +++ b/qtmips_machine/core.cpp @@ -112,7 +112,7 @@ static const struct DecodeMap dmap[] = { NOPE, // 44 NOPE, // 45 NOPE, // SWR - NOPE, // 47 + { .flags = DM_SUPPORTED | DM_ALUSRC, .alu = ALU_OP_ADDU, .mem_ctl = MemoryAccess::AC_CACHE_OP }, // CACHE NOPE, // 48 NOPE, // 49 NOPE, // 50 @@ -302,7 +302,9 @@ struct Core::dtMemory Core::memory(const struct dtExecute &dt) { emit instruction_memory(dt.inst); std::uint32_t towrite_val = dt.alu_val; - if (dt.memwrite) + if (dt.memctl == MemoryAccess::AC_CACHE_OP) + mem_data->sync(); + else if (dt.memwrite) mem_data->write_ctl(dt.memctl, dt.alu_val, dt.val_rt); else if (dt.memread) towrite_val = mem_data->read_ctl(dt.memctl, dt.alu_val); diff --git a/qtmips_machine/instruction.cpp b/qtmips_machine/instruction.cpp index baae4bc..5743c69 100644 --- a/qtmips_machine/instruction.cpp +++ b/qtmips_machine/instruction.cpp @@ -103,7 +103,7 @@ static const struct InstructionMap instruction_map[] = { IM_UNKNOWN, // 44 IM_UNKNOWN, // 45 {"SWR", IT_I, true, .flags = IMF_MEM}, - IM_UNKNOWN, // 47 + {"CACHE", IT_I, true, .flags = IMF_MEM}, // 47 IM_UNKNOWN, // 48 IM_UNKNOWN, // 49 IM_UNKNOWN, // 50 diff --git a/qtmips_machine/memory.h b/qtmips_machine/memory.h index 11832fb..aa75b18 100644 --- a/qtmips_machine/memory.h +++ b/qtmips_machine/memory.h @@ -61,7 +61,8 @@ public: AC_HALFWORD, AC_WORD, AC_BYTE_UNSIGNED, - AC_HALFWORD_UNSIGNED + AC_HALFWORD_UNSIGNED, + AC_CACHE_OP, }; void write_ctl(enum AccessControl ctl, std::uint32_t offset, std::uint32_t value); std::uint32_t read_ctl(enum AccessControl ctl, std::uint32_t offset) const; |