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target-microblaze: Introduce a use-hw-mul property 

Introduce a use-div property making multiplication instructions
optional.

Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
This commit is contained in:
Edgar E. Iglesias 2017-06-20 13:06:44 +02:00
parent 47709e4c66
commit 9b9643181a
3 changed files with 11 additions and 7 deletions
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12
target/microblaze/cpu.c
View File

@ -150,8 +150,7 @@ static void mb_cpu_realizefn(DeviceState *dev, Error **errp)
qemu_init_vcpu(cs);
env->pvr.regs[0] = PVR0_USE_HW_MUL_MASK \
| PVR0_USE_EXC_MASK \
env->pvr.regs[0] = PVR0_USE_EXC_MASK \
| PVR0_USE_ICACHE_MASK \
| PVR0_USE_DCACHE_MASK;
env->pvr.regs[2] = PVR2_D_OPB_MASK \
@ -160,8 +159,6 @@ static void mb_cpu_realizefn(DeviceState *dev, Error **errp)
| PVR2_I_LMB_MASK \
| PVR2_USE_MSR_INSTR \
| PVR2_USE_PCMP_INSTR \
| PVR2_USE_HW_MUL_MASK \
| PVR2_USE_MUL64_MASK \
| PVR2_FPU_EXC_MASK \
| 0;
@ -178,6 +175,7 @@ static void mb_cpu_realizefn(DeviceState *dev, Error **errp)
env->pvr.regs[0] |= (cpu->cfg.stackprot ? PVR0_SPROT_MASK : 0) |
(cpu->cfg.use_fpu ? PVR0_USE_FPU_MASK : 0) |
(cpu->cfg.use_hw_mul ? PVR0_USE_HW_MUL_MASK : 0) |
(cpu->cfg.use_barrel ? PVR0_USE_BARREL_MASK : 0) |
(cpu->cfg.use_div ? PVR0_USE_DIV_MASK : 0) |
(cpu->cfg.use_mmu ? PVR0_USE_MMU_MASK : 0) |
@ -187,6 +185,8 @@ static void mb_cpu_realizefn(DeviceState *dev, Error **errp)
env->pvr.regs[2] |= (cpu->cfg.use_fpu ? PVR2_USE_FPU_MASK : 0) |
(cpu->cfg.use_fpu > 1 ? PVR2_USE_FPU2_MASK : 0) |
(cpu->cfg.use_hw_mul ? PVR2_USE_HW_MUL_MASK : 0) |
(cpu->cfg.use_hw_mul > 1 ? PVR2_USE_MUL64_MASK : 0) |
(cpu->cfg.use_barrel ? PVR2_USE_BARREL_MASK : 0) |
(cpu->cfg.use_div ? PVR2_USE_DIV_MASK : 0);
@ -235,6 +235,10 @@ static Property mb_properties[] = {
* are enabled
*/
DEFINE_PROP_UINT8("use-fpu", MicroBlazeCPU, cfg.use_fpu, 2),
/* If use-hw-mul > 0 - Multiplier is enabled
* If use-hw-mul = 2 - 64-bit multiplier is enabled
*/
DEFINE_PROP_UINT8("use-hw-mul", MicroBlazeCPU, cfg.use_hw_mul, 2),
DEFINE_PROP_BOOL("use-barrel", MicroBlazeCPU, cfg.use_barrel, true),
DEFINE_PROP_BOOL("use-div", MicroBlazeCPU, cfg.use_div, true),
DEFINE_PROP_BOOL("use-mmu", MicroBlazeCPU, cfg.use_mmu, true),

1
target/microblaze/cpu.h
View File

@ -298,6 +298,7 @@ struct MicroBlazeCPU {
bool stackprot;
uint32_t base_vectors;
uint8_t use_fpu;
uint8_t use_hw_mul;
bool use_barrel;
bool use_div;
bool use_mmu;

5
target/microblaze/translate.c
View File

@ -589,7 +589,7 @@ static void dec_mul(DisasContext *dc)
if ((dc->tb_flags & MSR_EE_FLAG)
&& (dc->cpu->env.pvr.regs[2] & PVR2_ILL_OPCODE_EXC_MASK)
&& !(dc->cpu->env.pvr.regs[0] & PVR0_USE_HW_MUL_MASK)) {
&& !dc->cpu->cfg.use_hw_mul) {
tcg_gen_movi_tl(cpu_SR[SR_ESR], ESR_EC_ILLEGAL_OP);
t_gen_raise_exception(dc, EXCP_HW_EXCP);
return;
@ -604,8 +604,7 @@ static void dec_mul(DisasContext *dc)
}
/* mulh, mulhsu and mulhu are not available if C_USE_HW_MUL is < 2. */
if (subcode >= 1 && subcode <= 3
&& !((dc->cpu->env.pvr.regs[2] & PVR2_USE_MUL64_MASK))) {
if (subcode >= 1 && subcode <= 3 && dc->cpu->cfg.use_hw_mul < 2) {
/* nop??? */
}