Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* cpu.c: Dinky routines to look for the kind of Sparc cpu |
| 2 | * we are on. |
| 3 | * |
| 4 | * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu) |
| 5 | */ |
| 6 | |
| 7 | #include <linux/config.h> |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/init.h> |
| 10 | #include <linux/sched.h> |
| 11 | #include <linux/smp.h> |
| 12 | #include <asm/asi.h> |
| 13 | #include <asm/system.h> |
| 14 | #include <asm/fpumacro.h> |
| 15 | #include <asm/cpudata.h> |
| 16 | |
| 17 | DEFINE_PER_CPU(cpuinfo_sparc, __cpu_data) = { 0 }; |
| 18 | |
| 19 | struct cpu_iu_info { |
| 20 | short manuf; |
| 21 | short impl; |
| 22 | char* cpu_name; /* should be enough I hope... */ |
| 23 | }; |
| 24 | |
| 25 | struct cpu_fp_info { |
| 26 | short manuf; |
| 27 | short impl; |
| 28 | char fpu_vers; |
| 29 | char* fp_name; |
| 30 | }; |
| 31 | |
| 32 | struct cpu_fp_info linux_sparc_fpu[] = { |
| 33 | { 0x17, 0x10, 0, "UltraSparc I integrated FPU"}, |
| 34 | { 0x22, 0x10, 0, "UltraSparc I integrated FPU"}, |
| 35 | { 0x17, 0x11, 0, "UltraSparc II integrated FPU"}, |
| 36 | { 0x17, 0x12, 0, "UltraSparc IIi integrated FPU"}, |
| 37 | { 0x17, 0x13, 0, "UltraSparc IIe integrated FPU"}, |
| 38 | { 0x3e, 0x14, 0, "UltraSparc III integrated FPU"}, |
| 39 | { 0x3e, 0x15, 0, "UltraSparc III+ integrated FPU"}, |
| 40 | { 0x3e, 0x16, 0, "UltraSparc IIIi integrated FPU"}, |
| 41 | { 0x3e, 0x18, 0, "UltraSparc IV integrated FPU"}, |
| 42 | }; |
| 43 | |
| 44 | #define NSPARCFPU (sizeof(linux_sparc_fpu)/sizeof(struct cpu_fp_info)) |
| 45 | |
| 46 | struct cpu_iu_info linux_sparc_chips[] = { |
| 47 | { 0x17, 0x10, "TI UltraSparc I (SpitFire)"}, |
| 48 | { 0x22, 0x10, "TI UltraSparc I (SpitFire)"}, |
| 49 | { 0x17, 0x11, "TI UltraSparc II (BlackBird)"}, |
| 50 | { 0x17, 0x12, "TI UltraSparc IIi (Sabre)"}, |
| 51 | { 0x17, 0x13, "TI UltraSparc IIe (Hummingbird)"}, |
| 52 | { 0x3e, 0x14, "TI UltraSparc III (Cheetah)"}, |
| 53 | { 0x3e, 0x15, "TI UltraSparc III+ (Cheetah+)"}, |
| 54 | { 0x3e, 0x16, "TI UltraSparc IIIi (Jalapeno)"}, |
| 55 | { 0x3e, 0x18, "TI UltraSparc IV (Jaguar)"}, |
| 56 | }; |
| 57 | |
| 58 | #define NSPARCCHIPS (sizeof(linux_sparc_chips)/sizeof(struct cpu_iu_info)) |
| 59 | |
| 60 | char *sparc_cpu_type = "cpu-oops"; |
| 61 | char *sparc_fpu_type = "fpu-oops"; |
| 62 | |
| 63 | unsigned int fsr_storage; |
| 64 | |
| 65 | void __init cpu_probe(void) |
| 66 | { |
| 67 | unsigned long ver, fpu_vers, manuf, impl, fprs; |
| 68 | int i; |
| 69 | |
| 70 | fprs = fprs_read(); |
| 71 | fprs_write(FPRS_FEF); |
| 72 | __asm__ __volatile__ ("rdpr %%ver, %0; stx %%fsr, [%1]" |
| 73 | : "=&r" (ver) |
| 74 | : "r" (&fpu_vers)); |
| 75 | fprs_write(fprs); |
| 76 | |
| 77 | manuf = ((ver >> 48) & 0xffff); |
| 78 | impl = ((ver >> 32) & 0xffff); |
| 79 | |
| 80 | fpu_vers = ((fpu_vers >> 17) & 0x7); |
| 81 | |
| 82 | retry: |
| 83 | for (i = 0; i < NSPARCCHIPS; i++) { |
| 84 | if (linux_sparc_chips[i].manuf == manuf) { |
| 85 | if (linux_sparc_chips[i].impl == impl) { |
| 86 | sparc_cpu_type = |
| 87 | linux_sparc_chips[i].cpu_name; |
| 88 | break; |
| 89 | } |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | if (i == NSPARCCHIPS) { |
| 94 | /* Maybe it is a cheetah+ derivative, report it as cheetah+ |
| 95 | * in that case until we learn the real names. |
| 96 | */ |
| 97 | if (manuf == 0x3e && |
| 98 | impl > 0x15) { |
| 99 | impl = 0x15; |
| 100 | goto retry; |
| 101 | } else { |
| 102 | printk("DEBUG: manuf[%lx] impl[%lx]\n", |
| 103 | manuf, impl); |
| 104 | } |
| 105 | sparc_cpu_type = "Unknown CPU"; |
| 106 | } |
| 107 | |
| 108 | for (i = 0; i < NSPARCFPU; i++) { |
| 109 | if (linux_sparc_fpu[i].manuf == manuf && |
| 110 | linux_sparc_fpu[i].impl == impl) { |
| 111 | if (linux_sparc_fpu[i].fpu_vers == fpu_vers) { |
| 112 | sparc_fpu_type = |
| 113 | linux_sparc_fpu[i].fp_name; |
| 114 | break; |
| 115 | } |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | if (i == NSPARCFPU) { |
| 120 | printk("DEBUG: manuf[%lx] impl[%lx] fsr.vers[%lx]\n", |
| 121 | manuf, impl, fpu_vers); |
| 122 | sparc_fpu_type = "Unknown FPU"; |
| 123 | } |
| 124 | } |