xref: /linux/arch/x86/kernel/cpu/transmeta.c (revision 7b49a3fb69e785a2425c8dc7dbd0779a0a4c0eb2)
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/kernel.h>
3 #include <linux/sched.h>
4 #include <linux/sched/clock.h>
5 #include <linux/mm.h>
6 
7 #include <asm/cpufeature.h>
8 #include <asm/cpuid/api.h>
9 #include <asm/msr.h>
10 
11 #include "cpu.h"
12 
13 static void early_init_transmeta(struct cpuinfo_x86 *c)
14 {
15 	u32 xlvl;
16 
17 	/* Transmeta-defined flags: level 0x80860001 */
18 	xlvl = cpuid_eax(0x80860000);
19 	if ((xlvl & 0xffff0000) == 0x80860000) {
20 		if (xlvl >= 0x80860001)
21 			c->x86_capability[CPUID_8086_0001_EDX] = cpuid_edx(0x80860001);
22 	}
23 }
24 
25 static void init_transmeta(struct cpuinfo_x86 *c)
26 {
27 	unsigned int cap_mask, uk, max, dummy;
28 	unsigned int cms_rev1, cms_rev2;
29 	unsigned int cpu_rev, cpu_freq = 0, cpu_flags, new_cpu_rev;
30 	char cpu_info[65];
31 
32 	early_init_transmeta(c);
33 
34 	cpu_detect_cache_sizes(c);
35 
36 	/* Print CMS and CPU revision */
37 	max = cpuid_eax(0x80860000);
38 	cpu_rev = 0;
39 	if (max >= 0x80860001) {
40 		cpuid(0x80860001, &dummy, &cpu_rev, &cpu_freq, &cpu_flags);
41 		if (cpu_rev != 0x02000000) {
42 			pr_info("CPU: Processor revision %u.%u.%u.%u, %u MHz\n",
43 				(cpu_rev >> 24) & 0xff,
44 				(cpu_rev >> 16) & 0xff,
45 				(cpu_rev >> 8) & 0xff,
46 				cpu_rev & 0xff,
47 				cpu_freq);
48 		}
49 	}
50 	if (max >= 0x80860002) {
51 		cpuid(0x80860002, &new_cpu_rev, &cms_rev1, &cms_rev2, &dummy);
52 		if (cpu_rev == 0x02000000) {
53 			pr_info("CPU: Processor revision %08X, %u MHz\n",
54 				new_cpu_rev, cpu_freq);
55 		}
56 		pr_info("CPU: Code Morphing Software revision %u.%u.%u-%u-%u\n",
57 		       (cms_rev1 >> 24) & 0xff,
58 		       (cms_rev1 >> 16) & 0xff,
59 		       (cms_rev1 >> 8) & 0xff,
60 		       cms_rev1 & 0xff,
61 		       cms_rev2);
62 	}
63 	if (max >= 0x80860006) {
64 		cpuid(0x80860003,
65 		      (void *)&cpu_info[0],
66 		      (void *)&cpu_info[4],
67 		      (void *)&cpu_info[8],
68 		      (void *)&cpu_info[12]);
69 		cpuid(0x80860004,
70 		      (void *)&cpu_info[16],
71 		      (void *)&cpu_info[20],
72 		      (void *)&cpu_info[24],
73 		      (void *)&cpu_info[28]);
74 		cpuid(0x80860005,
75 		      (void *)&cpu_info[32],
76 		      (void *)&cpu_info[36],
77 		      (void *)&cpu_info[40],
78 		      (void *)&cpu_info[44]);
79 		cpuid(0x80860006,
80 		      (void *)&cpu_info[48],
81 		      (void *)&cpu_info[52],
82 		      (void *)&cpu_info[56],
83 		      (void *)&cpu_info[60]);
84 		cpu_info[64] = '\0';
85 		pr_info("CPU: %s\n", cpu_info);
86 	}
87 
88 	/* Unhide possibly hidden capability flags */
89 	rdmsr(0x80860004, cap_mask, uk);
90 	wrmsr(0x80860004, ~0, uk);
91 	c->x86_capability[CPUID_1_EDX] = cpuid_edx(0x00000001);
92 	wrmsr(0x80860004, cap_mask, uk);
93 
94 	/* All Transmeta CPUs have a constant TSC */
95 	set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);
96 
97 #ifdef CONFIG_SYSCTL
98 	/*
99 	 * randomize_va_space slows us down enormously;
100 	 * it probably triggers retranslation of x86->native bytecode
101 	 */
102 	randomize_va_space = 0;
103 #endif
104 }
105 
106 static const struct cpu_dev transmeta_cpu_dev = {
107 	.c_vendor	= "Transmeta",
108 	.c_ident	= { "GenuineTMx86", "TransmetaCPU" },
109 	.c_early_init	= early_init_transmeta,
110 	.c_init		= init_transmeta,
111 	.c_x86_vendor	= X86_VENDOR_TRANSMETA,
112 };
113 
114 cpu_dev_register(transmeta_cpu_dev);
115