cpu.c
上传用户:jlfgdled
上传日期:2013-04-10
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文件大小:3k
- /* cpu.c: Dinky routines to look for the kind of Sparc cpu
- * we are on.
- *
- * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
- */
- #include <linux/config.h>
- #include <linux/kernel.h>
- #include <linux/init.h>
- #include <linux/sched.h>
- #include <linux/smp.h>
- #include <asm/asi.h>
- #include <asm/system.h>
- #include <asm/fpumacro.h>
- struct cpu_iu_info {
- short manuf;
- short impl;
- char* cpu_name; /* should be enough I hope... */
- };
- struct cpu_fp_info {
- short manuf;
- short impl;
- char fpu_vers;
- char* fp_name;
- };
- /* In order to get the fpu type correct, you need to take the IDPROM's
- * machine type value into consideration too. I will fix this.
- */
- struct cpu_fp_info linux_sparc_fpu[] = {
- { 0x17, 0x10, 0, "UltraSparc I integrated FPU"},
- { 0x22, 0x10, 0, "UltraSparc I integrated FPU"},
- { 0x17, 0x11, 0, "UltraSparc II integrated FPU"},
- { 0x17, 0x12, 0, "UltraSparc IIi integrated FPU"},
- { 0x17, 0x13, 0, "UltraSparc IIe integrated FPU"},
- { 0x3e, 0x14, 0, "UltraSparc III integrated FPU"},
- { 0x3e, 0x15, 0, "UltraSparc III+ integrated FPU"},
- };
- #define NSPARCFPU (sizeof(linux_sparc_fpu)/sizeof(struct cpu_fp_info))
- struct cpu_iu_info linux_sparc_chips[] = {
- { 0x17, 0x10, "TI UltraSparc I (SpitFire)"},
- { 0x22, 0x10, "TI UltraSparc I (SpitFire)"},
- { 0x17, 0x11, "TI UltraSparc II (BlackBird)"},
- { 0x17, 0x12, "TI UltraSparc IIi"},
- { 0x17, 0x13, "TI UltraSparc IIe"},
- { 0x3e, 0x14, "TI UltraSparc III (Cheetah)"},
- { 0x3e, 0x15, "TI UltraSparc III+ (Cheetah+)"},
- };
- #define NSPARCCHIPS (sizeof(linux_sparc_chips)/sizeof(struct cpu_iu_info))
- #ifdef CONFIG_SMP
- char *sparc_cpu_type[64] = { "cpu-oops", "cpu-oops1", "cpu-oops2", "cpu-oops3" };
- char *sparc_fpu_type[64] = { "fpu-oops", "fpu-oops1", "fpu-oops2", "fpu-oops3" };
- #else
- char *sparc_cpu_type[64] = { "cpu-oops", };
- char *sparc_fpu_type[64] = { "fpu-oops", };
- #endif
- unsigned int fsr_storage;
- void __init cpu_probe(void)
- {
- unsigned long ver, fpu_vers, manuf, impl, fprs;
- int i, cpuid;
-
- cpuid = hard_smp_processor_id();
- fprs = fprs_read();
- fprs_write(FPRS_FEF);
- __asm__ __volatile__ ("rdpr %%ver, %0; stx %%fsr, [%1]"
- : "=&r" (ver)
- : "r" (&fpu_vers));
- fprs_write(fprs);
-
- manuf = ((ver >> 48) & 0xffff);
- impl = ((ver >> 32) & 0xffff);
- fpu_vers = ((fpu_vers >> 17) & 0x7);
- retry:
- for (i = 0; i < NSPARCCHIPS; i++) {
- if (linux_sparc_chips[i].manuf == manuf) {
- if (linux_sparc_chips[i].impl == impl) {
- sparc_cpu_type[cpuid]
- = linux_sparc_chips[i].cpu_name;
- break;
- }
- }
- }
- if (i == NSPARCCHIPS) {
- /* Maybe it is a cheetah+ derivative, report it as cheetah+
- * in that case until we learn the real names.
- */
- if (manuf == 0x3e &&
- impl > 0x15) {
- impl = 0x15;
- goto retry;
- } else {
- printk("DEBUG: manuf[%lx] impl[%lx]n",
- manuf, impl);
- }
- sparc_cpu_type[cpuid] = "Unknown CPU";
- }
- for (i = 0; i < NSPARCFPU; i++) {
- if (linux_sparc_fpu[i].manuf == manuf &&
- linux_sparc_fpu[i].impl == impl) {
- if (linux_sparc_fpu[i].fpu_vers == fpu_vers) {
- sparc_fpu_type[cpuid]
- = linux_sparc_fpu[i].fp_name;
- break;
- }
- }
- }
- if (i == NSPARCFPU) {
- printk("DEBUG: manuf[%lx] impl[%lx] fsr.vers[%lx]n",
- manuf, impl, fpu_vers);
- sparc_fpu_type[cpuid] = "Unknown FPU";
- }
- }