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Added FPU support for pre-486 CPUs.

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This commit does not include timings for 8087, 80287 or 80387 FPUs, these will
be added later. It also does not restrict the use of 486 and later FPU
instructions.
This commit is contained in:
SarahW 2020-01-22 20:53:13 +00:00
commit 0e8926936d
11 changed files with 1349 additions and 919 deletions
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55
src/cpu.c
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@ -7,6 +7,7 @@
#include "pci.h"
#include "codegen.h"
int fpu_type;
uint32_t cpu_features;
static int cpu_turbo_speed, cpu_nonturbo_speed;
@ -125,10 +126,59 @@ void cpu_set_edx()
EDX = models[model].cpu[cpu_manufacturer].cpus[cpu].edx_reset;
}
int fpu_get_type(int model, int manu, int cpu, const char *internal_name)
{
CPU *cpu_s = &models[model].cpu[manu].cpus[cpu];
const FPU *fpus = cpu_s->fpus;
int fpu_type = fpus[0].type;
int c = 0;
while (fpus[c].internal_name)
{
if (!strcmp(internal_name, fpus[c].internal_name))
fpu_type = fpus[c].type;
c++;
}
return fpu_type;
}
const char *fpu_get_internal_name(int model, int manu, int cpu, int type)
{
CPU *cpu_s = &models[model].cpu[manu].cpus[cpu];
const FPU *fpus = cpu_s->fpus;
int c = 0;
while (fpus[c].internal_name)
{
if (fpus[c].type == type)
return fpus[c].internal_name;
c++;
}
return fpus[0].internal_name;
}
const char *fpu_get_name_from_index(int model, int manu, int cpu, int c)
{
CPU *cpu_s = &models[model].cpu[manu].cpus[cpu];
const FPU *fpus = cpu_s->fpus;
return fpus[c].name;
}
int fpu_get_type_from_index(int model, int manu, int cpu, int c)
{
CPU *cpu_s = &models[model].cpu[manu].cpus[cpu];
const FPU *fpus = cpu_s->fpus;
return fpus[c].type;
}
void cpu_set()
{
CPU *cpu_s;
if (!models[model].cpu[cpu_manufacturer].cpus)
{
/*CPU is invalid, set to default*/
@ -143,7 +193,8 @@ void cpu_set()
is8086 = (cpu_s->cpu_type > CPU_8088);
is386 = (cpu_s->cpu_type >= CPU_386SX);
is486 = (cpu_s->cpu_type >= CPU_i486SX) || (cpu_s->cpu_type == CPU_486SLC || cpu_s->cpu_type == CPU_486DLC);
hasfpu = (cpu_s->cpu_type >= CPU_i486DX);
hasfpu = (fpu_type != FPU_NONE);
cpu_iscyrix = (cpu_s->cpu_type == CPU_486SLC || cpu_s->cpu_type == CPU_486DLC || cpu_s->cpu_type == CPU_Cx486S || cpu_s->cpu_type == CPU_Cx486DX || cpu_s->cpu_type == CPU_Cx5x86 || cpu_s->cpu_type == CPU_Cx6x86 || cpu_s->cpu_type == CPU_Cx6x86MX || cpu_s->cpu_type == CPU_Cx6x86L || cpu_s->cpu_type == CPU_CxGX1);
cpu_16bitbus = (cpu_s->cpu_type == CPU_286 || cpu_s->cpu_type == CPU_386SX || cpu_s->cpu_type == CPU_486SLC);
if (cpu_s->multi)