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提交 cea7e2df 编写于 作者: R Ralf Baechle
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MIPS: Sort out CPU type to name translation. 

As noticed by David Daney <ddaney@caviumnetworks.com>, the old long switch
statement did not comply with the Linux C coding style.  It was also yet
another place of code to be changed when adding a new processor type
leading to annoying bugs for example in /proc/cpuinfo.

Fixed by moving the setting of the CPU type string into the core of the
probing code and a few BUG_ON() test to ensure the CPU probing code indeed
did its job and removing multiple now redundant tests.
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
上级 255a12fb
隐藏空白更改
内联 并排
Showing with 98 addition and 127 deletion
arch/mips/kernel/cpu-probe.c
浏览文件 @ cea7e2df
......@@ -286,11 +286,12 @@ static inline int __cpu_has_fpu(void)
#define R4K_OPTS (MIPS_CPU_TLB | MIPS_CPU_4KEX | MIPS_CPU_4K_CACHE \
| MIPS_CPU_COUNTER)
static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
static inline void cpu_probe_legacy(struct cpuinfo_mips *c, unsigned int cpu)
{
switch (c->processor_id & 0xff00) {
case PRID_IMP_R2000:
c->cputype = CPU_R2000;
__cpu_name[cpu] = "R2000";
c->isa_level = MIPS_CPU_ISA_I;
c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
MIPS_CPU_NOFPUEX;
......@@ -299,13 +300,19 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
c->tlbsize = 64;
break;
case PRID_IMP_R3000:
if ((c->processor_id & 0xff) == PRID_REV_R3000A)
if (cpu_has_confreg())
if ((c->processor_id & 0xff) == PRID_REV_R3000A) {
if (cpu_has_confreg()) {
c->cputype = CPU_R3081E;
else
__cpu_name[cpu] = "R3081";
} else {
c->cputype = CPU_R3000A;
else
__cpu_name[cpu] = "R3000A";
}
break;
} else {
c->cputype = CPU_R3000;
__cpu_name[cpu] = "R3000";
}
c->isa_level = MIPS_CPU_ISA_I;
c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
MIPS_CPU_NOFPUEX;
......@@ -315,15 +322,21 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_R4000:
if (read_c0_config() & CONF_SC) {
if ((c->processor_id & 0xff) >= PRID_REV_R4400)
if ((c->processor_id & 0xff) >= PRID_REV_R4400) {
c->cputype = CPU_R4400PC;
else
__cpu_name[cpu] = "R4400PC";
} else {
c->cputype = CPU_R4000PC;
__cpu_name[cpu] = "R4000PC";
}
} else {
if ((c->processor_id & 0xff) >= PRID_REV_R4400)
if ((c->processor_id & 0xff) >= PRID_REV_R4400) {
c->cputype = CPU_R4400SC;
else
__cpu_name[cpu] = "R4400SC";
} else {
c->cputype = CPU_R4000SC;
__cpu_name[cpu] = "R4000SC";
}
}
c->isa_level = MIPS_CPU_ISA_III;
......@@ -336,25 +349,34 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
switch (c->processor_id & 0xf0) {
case PRID_REV_VR4111:
c->cputype = CPU_VR4111;
__cpu_name[cpu] = "NEC VR4111";
break;
case PRID_REV_VR4121:
c->cputype = CPU_VR4121;
__cpu_name[cpu] = "NEC VR4121";
break;
case PRID_REV_VR4122:
if ((c->processor_id & 0xf) < 0x3)
if ((c->processor_id & 0xf) < 0x3) {
c->cputype = CPU_VR4122;
else
__cpu_name[cpu] = "NEC VR4122";
} else {
c->cputype = CPU_VR4181A;
__cpu_name[cpu] = "NEC VR4181A";
}
break;
case PRID_REV_VR4130:
if ((c->processor_id & 0xf) < 0x4)
if ((c->processor_id & 0xf) < 0x4) {
c->cputype = CPU_VR4131;
else
__cpu_name[cpu] = "NEC VR4131";
} else {
c->cputype = CPU_VR4133;
__cpu_name[cpu] = "NEC VR4133";
}
break;
default:
printk(KERN_INFO "Unexpected CPU of NEC VR4100 series\n");
c->cputype = CPU_VR41XX;
__cpu_name[cpu] = "NEC Vr41xx";
break;
}
c->isa_level = MIPS_CPU_ISA_III;
......@@ -363,6 +385,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_R4300:
c->cputype = CPU_R4300;
__cpu_name[cpu] = "R4300";
c->isa_level = MIPS_CPU_ISA_III;
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
MIPS_CPU_LLSC;
......@@ -370,6 +393,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_R4600:
c->cputype = CPU_R4600;
__cpu_name[cpu] = "R4600";
c->isa_level = MIPS_CPU_ISA_III;
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
MIPS_CPU_LLSC;
......@@ -384,6 +408,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
* it's c0_prid id number with the TX3900.
*/
c->cputype = CPU_R4650;
__cpu_name[cpu] = "R4650";
c->isa_level = MIPS_CPU_ISA_III;
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_LLSC;
c->tlbsize = 48;
......@@ -395,25 +420,26 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
if ((c->processor_id & 0xf0) == (PRID_REV_TX3927 & 0xf0)) {
c->cputype = CPU_TX3927;
__cpu_name[cpu] = "TX3927";
c->tlbsize = 64;
} else {
switch (c->processor_id & 0xff) {
case PRID_REV_TX3912:
c->cputype = CPU_TX3912;
__cpu_name[cpu] = "TX3912";
c->tlbsize = 32;
break;
case PRID_REV_TX3922:
c->cputype = CPU_TX3922;
__cpu_name[cpu] = "TX3922";
c->tlbsize = 64;
break;
default:
c->cputype = CPU_UNKNOWN;
break;
}
}
break;
case PRID_IMP_R4700:
c->cputype = CPU_R4700;
__cpu_name[cpu] = "R4700";
c->isa_level = MIPS_CPU_ISA_III;
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
MIPS_CPU_LLSC;
......@@ -421,6 +447,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_TX49:
c->cputype = CPU_TX49XX;
__cpu_name[cpu] = "R49XX";
c->isa_level = MIPS_CPU_ISA_III;
c->options = R4K_OPTS | MIPS_CPU_LLSC;
if (!(c->processor_id & 0x08))
......@@ -429,6 +456,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_R5000:
c->cputype = CPU_R5000;
__cpu_name[cpu] = "R5000";
c->isa_level = MIPS_CPU_ISA_IV;
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
MIPS_CPU_LLSC;
......@@ -436,6 +464,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_R5432:
c->cputype = CPU_R5432;
__cpu_name[cpu] = "R5432";
c->isa_level = MIPS_CPU_ISA_IV;
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
MIPS_CPU_WATCH | MIPS_CPU_LLSC;
......@@ -443,6 +472,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_R5500:
c->cputype = CPU_R5500;
__cpu_name[cpu] = "R5500";
c->isa_level = MIPS_CPU_ISA_IV;
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
MIPS_CPU_WATCH | MIPS_CPU_LLSC;
......@@ -450,6 +480,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_NEVADA:
c->cputype = CPU_NEVADA;
__cpu_name[cpu] = "Nevada";
c->isa_level = MIPS_CPU_ISA_IV;
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
MIPS_CPU_DIVEC | MIPS_CPU_LLSC;
......@@ -457,6 +488,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_R6000:
c->cputype = CPU_R6000;
__cpu_name[cpu] = "R6000";
c->isa_level = MIPS_CPU_ISA_II;
c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
MIPS_CPU_LLSC;
......@@ -464,6 +496,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_R6000A:
c->cputype = CPU_R6000A;
__cpu_name[cpu] = "R6000A";
c->isa_level = MIPS_CPU_ISA_II;
c->options = MIPS_CPU_TLB | MIPS_CPU_FPU |
MIPS_CPU_LLSC;
......@@ -471,6 +504,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_RM7000:
c->cputype = CPU_RM7000;
__cpu_name[cpu] = "RM7000";
c->isa_level = MIPS_CPU_ISA_IV;
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
MIPS_CPU_LLSC;
......@@ -486,6 +520,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_RM9000:
c->cputype = CPU_RM9000;
__cpu_name[cpu] = "RM9000";
c->isa_level = MIPS_CPU_ISA_IV;
c->options = R4K_OPTS | MIPS_CPU_FPU | MIPS_CPU_32FPR |
MIPS_CPU_LLSC;
......@@ -500,6 +535,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_R8000:
c->cputype = CPU_R8000;
__cpu_name[cpu] = "RM8000";
c->isa_level = MIPS_CPU_ISA_IV;
c->options = MIPS_CPU_TLB | MIPS_CPU_4KEX |
MIPS_CPU_FPU | MIPS_CPU_32FPR |
......@@ -508,6 +544,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_R10000:
c->cputype = CPU_R10000;
__cpu_name[cpu] = "R10000";
c->isa_level = MIPS_CPU_ISA_IV;
c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
MIPS_CPU_FPU | MIPS_CPU_32FPR |
......@@ -517,6 +554,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_R12000:
c->cputype = CPU_R12000;
__cpu_name[cpu] = "R12000";
c->isa_level = MIPS_CPU_ISA_IV;
c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
MIPS_CPU_FPU | MIPS_CPU_32FPR |
......@@ -526,6 +564,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_R14000:
c->cputype = CPU_R14000;
__cpu_name[cpu] = "R14000";
c->isa_level = MIPS_CPU_ISA_IV;
c->options = MIPS_CPU_TLB | MIPS_CPU_4K_CACHE | MIPS_CPU_4KEX |
MIPS_CPU_FPU | MIPS_CPU_32FPR |
......@@ -535,6 +574,7 @@ static inline void cpu_probe_legacy(struct cpuinfo_mips *c)
break;
case PRID_IMP_LOONGSON2:
c->cputype = CPU_LOONGSON2;
__cpu_name[cpu] = "ICT Loongson-2";
c->isa_level = MIPS_CPU_ISA_III;
c->options = R4K_OPTS |
MIPS_CPU_FPU | MIPS_CPU_LLSC |
......@@ -678,51 +718,62 @@ extern void spram_config(void);
static inline void spram_config(void) {}
#endif
static inline void cpu_probe_mips(struct cpuinfo_mips *c)
static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
{
decode_configs(c);
switch (c->processor_id & 0xff00) {
case PRID_IMP_4KC:
c->cputype = CPU_4KC;
__cpu_name[cpu] = "MIPS 4Kc";
break;
case PRID_IMP_4KEC:
c->cputype = CPU_4KEC;
__cpu_name[cpu] = "MIPS 4KEc";
break;
case PRID_IMP_4KECR2:
c->cputype = CPU_4KEC;
__cpu_name[cpu] = "MIPS 4KEc";
break;
case PRID_IMP_4KSC:
case PRID_IMP_4KSD:
c->cputype = CPU_4KSC;
__cpu_name[cpu] = "MIPS 4KSc";
break;
case PRID_IMP_5KC:
c->cputype = CPU_5KC;
__cpu_name[cpu] = "MIPS 5Kc";
break;
case PRID_IMP_20KC:
c->cputype = CPU_20KC;
__cpu_name[cpu] = "MIPS 20Kc";
break;
case PRID_IMP_24K:
case PRID_IMP_24KE:
c->cputype = CPU_24K;
__cpu_name[cpu] = "MIPS 24Kc";
break;
case PRID_IMP_25KF:
c->cputype = CPU_25KF;
__cpu_name[cpu] = "MIPS 25Kc";
break;
case PRID_IMP_34K:
c->cputype = CPU_34K;
__cpu_name[cpu] = "MIPS 34Kc";
break;
case PRID_IMP_74K:
c->cputype = CPU_74K;
__cpu_name[cpu] = "MIPS 74Kc";
break;
case PRID_IMP_1004K:
c->cputype = CPU_1004K;
__cpu_name[cpu] = "MIPS 1004Kc";
break;
}
spram_config();
}
static inline void cpu_probe_alchemy(struct cpuinfo_mips *c)
static inline void cpu_probe_alchemy(struct cpuinfo_mips *c, unsigned int cpu)
{
decode_configs(c);
switch (c->processor_id & 0xff00) {
......@@ -731,23 +782,31 @@ static inline void cpu_probe_alchemy(struct cpuinfo_mips *c)
switch ((c->processor_id >> 24) & 0xff) {
case 0:
c->cputype = CPU_AU1000;
__cpu_name[cpu] = "Au1000";
break;
case 1:
c->cputype = CPU_AU1500;
__cpu_name[cpu] = "Au1500";
break;
case 2:
c->cputype = CPU_AU1100;
__cpu_name[cpu] = "Au1100";
break;
case 3:
c->cputype = CPU_AU1550;
__cpu_name[cpu] = "Au1550";
break;
case 4:
c->cputype = CPU_AU1200;
if (2 == (c->processor_id & 0xff))
__cpu_name[cpu] = "Au1200";
if ((c->processor_id & 0xff) == 2) {
c->cputype = CPU_AU1250;
__cpu_name[cpu] = "Au1250";
}
break;
case 5:
c->cputype = CPU_AU1210;
__cpu_name[cpu] = "Au1210";
break;
default:
panic("Unknown Au Core!");
......@@ -757,154 +816,67 @@ static inline void cpu_probe_alchemy(struct cpuinfo_mips *c)
}
}
static inline void cpu_probe_sibyte(struct cpuinfo_mips *c)
static inline void cpu_probe_sibyte(struct cpuinfo_mips *c, unsigned int cpu)
{
decode_configs(c);
switch (c->processor_id & 0xff00) {
case PRID_IMP_SB1:
c->cputype = CPU_SB1;
__cpu_name[cpu] = "SiByte SB1";
/* FPU in pass1 is known to have issues. */
if ((c->processor_id & 0xff) < 0x02)
c->options &= ~(MIPS_CPU_FPU | MIPS_CPU_32FPR);
break;
case PRID_IMP_SB1A:
c->cputype = CPU_SB1A;
__cpu_name[cpu] = "SiByte SB1A";
break;
}
}
static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c)
static inline void cpu_probe_sandcraft(struct cpuinfo_mips *c, unsigned int cpu)
{
decode_configs(c);
switch (c->processor_id & 0xff00) {
case PRID_IMP_SR71000:
c->cputype = CPU_SR71000;
__cpu_name[cpu] = "Sandcraft SR71000";
c->scache.ways = 8;
c->tlbsize = 64;
break;
}
}
static inline void cpu_probe_nxp(struct cpuinfo_mips *c)
static inline void cpu_probe_nxp(struct cpuinfo_mips *c, unsigned int cpu)
{
decode_configs(c);
switch (c->processor_id & 0xff00) {
case PRID_IMP_PR4450:
c->cputype = CPU_PR4450;
__cpu_name[cpu] = "Philips PR4450";
c->isa_level = MIPS_CPU_ISA_M32R1;
break;
default:
panic("Unknown NXP Core!"); /* REVISIT: die? */
break;
}
}
static inline void cpu_probe_broadcom(struct cpuinfo_mips *c)
static inline void cpu_probe_broadcom(struct cpuinfo_mips *c, unsigned int cpu)
{
decode_configs(c);
switch (c->processor_id & 0xff00) {
case PRID_IMP_BCM3302:
c->cputype = CPU_BCM3302;
__cpu_name[cpu] = "Broadcom BCM3302";
break;
case PRID_IMP_BCM4710:
c->cputype = CPU_BCM4710;
break;
default:
c->cputype = CPU_UNKNOWN;
__cpu_name[cpu] = "Broadcom BCM4710";
break;
}
}
const char *__cpu_name[NR_CPUS];
/*
* Name a CPU
*/
static __cpuinit const char *cpu_to_name(struct cpuinfo_mips *c)
{
const char *name = NULL;
switch (c->cputype) {
case CPU_UNKNOWN: name = "unknown"; break;
case CPU_R2000: name = "R2000"; break;
case CPU_R3000: name = "R3000"; break;
case CPU_R3000A: name = "R3000A"; break;
case CPU_R3041: name = "R3041"; break;
case CPU_R3051: name = "R3051"; break;
case CPU_R3052: name = "R3052"; break;
case CPU_R3081: name = "R3081"; break;
case CPU_R3081E: name = "R3081E"; break;
case CPU_R4000PC: name = "R4000PC"; break;
case CPU_R4000SC: name = "R4000SC"; break;
case CPU_R4000MC: name = "R4000MC"; break;
case CPU_R4200: name = "R4200"; break;
case CPU_R4400PC: name = "R4400PC"; break;
case CPU_R4400SC: name = "R4400SC"; break;
case CPU_R4400MC: name = "R4400MC"; break;
case CPU_R4600: name = "R4600"; break;
case CPU_R6000: name = "R6000"; break;
case CPU_R6000A: name = "R6000A"; break;
case CPU_R8000: name = "R8000"; break;
case CPU_R10000: name = "R10000"; break;
case CPU_R12000: name = "R12000"; break;
case CPU_R14000: name = "R14000"; break;
case CPU_R4300: name = "R4300"; break;
case CPU_R4650: name = "R4650"; break;
case CPU_R4700: name = "R4700"; break;
case CPU_R5000: name = "R5000"; break;
case CPU_R5000A: name = "R5000A"; break;
case CPU_R4640: name = "R4640"; break;
case CPU_NEVADA: name = "Nevada"; break;
case CPU_RM7000: name = "RM7000"; break;
case CPU_RM9000: name = "RM9000"; break;
case CPU_R5432: name = "R5432"; break;
case CPU_4KC: name = "MIPS 4Kc"; break;
case CPU_5KC: name = "MIPS 5Kc"; break;
case CPU_R4310: name = "R4310"; break;
case CPU_SB1: name = "SiByte SB1"; break;
case CPU_SB1A: name = "SiByte SB1A"; break;
case CPU_TX3912: name = "TX3912"; break;
case CPU_TX3922: name = "TX3922"; break;
case CPU_TX3927: name = "TX3927"; break;
case CPU_AU1000: name = "Au1000"; break;
case CPU_AU1500: name = "Au1500"; break;
case CPU_AU1100: name = "Au1100"; break;
case CPU_AU1550: name = "Au1550"; break;
case CPU_AU1200: name = "Au1200"; break;
case CPU_AU1210: name = "Au1210"; break;
case CPU_AU1250: name = "Au1250"; break;
case CPU_4KEC: name = "MIPS 4KEc"; break;
case CPU_4KSC: name = "MIPS 4KSc"; break;
case CPU_VR41XX: name = "NEC Vr41xx"; break;
case CPU_R5500: name = "R5500"; break;
case CPU_TX49XX: name = "TX49xx"; break;
case CPU_20KC: name = "MIPS 20Kc"; break;
case CPU_24K: name = "MIPS 24K"; break;
case CPU_25KF: name = "MIPS 25Kf"; break;
case CPU_34K: name = "MIPS 34K"; break;
case CPU_1004K: name = "MIPS 1004K"; break;
case CPU_74K: name = "MIPS 74K"; break;
case CPU_VR4111: name = "NEC VR4111"; break;
case CPU_VR4121: name = "NEC VR4121"; break;
case CPU_VR4122: name = "NEC VR4122"; break;
case CPU_VR4131: name = "NEC VR4131"; break;
case CPU_VR4133: name = "NEC VR4133"; break;
case CPU_VR4181: name = "NEC VR4181"; break;
case CPU_VR4181A: name = "NEC VR4181A"; break;
case CPU_SR71000: name = "Sandcraft SR71000"; break;
case CPU_BCM3302: name = "Broadcom BCM3302"; break;
case CPU_BCM4710: name = "Broadcom BCM4710"; break;
case CPU_PR4450: name = "Philips PR4450"; break;
case CPU_LOONGSON2: name = "ICT Loongson-2"; break;
default:
BUG();
}
return name;
}
__cpuinit void cpu_probe(void)
{
struct cpuinfo_mips *c = &current_cpu_data;
......@@ -917,30 +889,31 @@ __cpuinit void cpu_probe(void)
c->processor_id = read_c0_prid();
switch (c->processor_id & 0xff0000) {
case PRID_COMP_LEGACY:
cpu_probe_legacy(c);
cpu_probe_legacy(c, cpu);
break;
case PRID_COMP_MIPS:
cpu_probe_mips(c);
cpu_probe_mips(c, cpu);
break;
case PRID_COMP_ALCHEMY:
cpu_probe_alchemy(c);
cpu_probe_alchemy(c, cpu);
break;
case PRID_COMP_SIBYTE:
cpu_probe_sibyte(c);
cpu_probe_sibyte(c, cpu);
break;
case PRID_COMP_BROADCOM:
cpu_probe_broadcom(c);
cpu_probe_broadcom(c, cpu);
break;
case PRID_COMP_SANDCRAFT:
cpu_probe_sandcraft(c);
cpu_probe_sandcraft(c, cpu);
break;
case PRID_COMP_NXP:
cpu_probe_nxp(c);
cpu_probe_nxp(c, cpu);
break;
default:
c->cputype = CPU_UNKNOWN;
}
BUG_ON(!__cpu_name[cpu]);
BUG_ON(c->cputype == CPU_UNKNOWN);
/*
* Platform code can force the cpu type to optimize code
* generation. In that case be sure the cpu type is correctly
......@@ -960,8 +933,6 @@ __cpuinit void cpu_probe(void)
}
}
__cpu_name[cpu] = cpu_to_name(c);
if (cpu_has_mips_r2)
c->srsets = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
else
......
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