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386DX: Force external cache enabled to improve performance.

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This commit is contained in:
OBattler
2025-09-02 16:36:41 +02:00
parent 54fc345ee5
commit 766734eb3a
1 changed files with 13 additions and 7 deletions
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20
src/cpu/cpu.c
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@@ -1080,6 +1080,9 @@ cpu_set(void)
timing_jmp_rm = 12;
timing_jmp_pm = 27;
timing_jmp_pm_gate = 45;
if (cpu_s->cpu_type == CPU_386DX)
cpu_cache_ext_enabled = 1;
break;
case CPU_486SLC:
@@ -1161,6 +1164,9 @@ cpu_set(void)
timing_jmp_pm_gate = 37;
timing_misaligned = 3;
if (cpu_s->cpu_type == CPU_386DX)
cpu_cache_ext_enabled = 1;
break;
case CPU_i486SX_SLENH:
@@ -4473,13 +4479,6 @@ cpu_update_waitstates(void)
if (cpu_cache_int_enabled) {
/* Disable prefetch emulation */
cpu_prefetch_cycles = 0;
} else if (cpu_waitstates && (cpu_s->cpu_type >= CPU_286 && cpu_s->cpu_type <= CPU_386DX)) {
/* Waitstates override */
cpu_prefetch_cycles = cpu_waitstates + 1;
cpu_cycles_read = cpu_waitstates + 1;
cpu_cycles_read_l = (cpu_16bitbus ? 2 : 1) * (cpu_waitstates + 1);
cpu_cycles_write = cpu_waitstates + 1;
cpu_cycles_write_l = (cpu_16bitbus ? 2 : 1) * (cpu_waitstates + 1);
} else if (cpu_cache_ext_enabled) {
/* Use cache timings */
cpu_prefetch_cycles = cpu_s->cache_read_cycles;
@@ -4487,6 +4486,13 @@ cpu_update_waitstates(void)
cpu_cycles_read_l = (cpu_16bitbus ? 2 : 1) * cpu_s->cache_read_cycles;
cpu_cycles_write = cpu_s->cache_write_cycles;
cpu_cycles_write_l = (cpu_16bitbus ? 2 : 1) * cpu_s->cache_write_cycles;
} else if (cpu_waitstates && (cpu_s->cpu_type >= CPU_286 && cpu_s->cpu_type <= CPU_386DX)) {
/* Waitstates override */
cpu_prefetch_cycles = cpu_waitstates + 1;
cpu_cycles_read = cpu_waitstates + 1;
cpu_cycles_read_l = (cpu_16bitbus ? 2 : 1) * (cpu_waitstates + 1);
cpu_cycles_write = cpu_waitstates + 1;
cpu_cycles_write_l = (cpu_16bitbus ? 2 : 1) * (cpu_waitstates + 1);
} else {
/* Use memory timings */
cpu_prefetch_cycles = cpu_s->mem_read_cycles;