arch/x86/kernel/cpu/transmeta.c

Source file repositories/reference/linux-study-clean/arch/x86/kernel/cpu/transmeta.c

File Facts

System
Linux kernel
Corpus path
arch/x86/kernel/cpu/transmeta.c
Extension
.c
Size
3000 bytes
Lines
115
Domain
Architecture Layer
Bucket
arch/x86
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

if (cpu_rev != 0x02000000) {
			pr_info("CPU: Processor revision %u.%u.%u.%u, %u MHz\n",
				(cpu_rev >> 24) & 0xff,
				(cpu_rev >> 16) & 0xff,
				(cpu_rev >> 8) & 0xff,
				cpu_rev & 0xff,
				cpu_freq);
		}
	}
	if (max >= 0x80860002) {
		cpuid(0x80860002, &new_cpu_rev, &cms_rev1, &cms_rev2, &dummy);
		if (cpu_rev == 0x02000000) {
			pr_info("CPU: Processor revision %08X, %u MHz\n",
				new_cpu_rev, cpu_freq);
		}
		pr_info("CPU: Code Morphing Software revision %u.%u.%u-%u-%u\n",
		       (cms_rev1 >> 24) & 0xff,
		       (cms_rev1 >> 16) & 0xff,
		       (cms_rev1 >> 8) & 0xff,
		       cms_rev1 & 0xff,
		       cms_rev2);
	}
	if (max >= 0x80860006) {
		cpuid(0x80860003,
		      (void *)&cpu_info[0],
		      (void *)&cpu_info[4],
		      (void *)&cpu_info[8],
		      (void *)&cpu_info[12]);
		cpuid(0x80860004,
		      (void *)&cpu_info[16],
		      (void *)&cpu_info[20],
		      (void *)&cpu_info[24],
		      (void *)&cpu_info[28]);
		cpuid(0x80860005,
		      (void *)&cpu_info[32],
		      (void *)&cpu_info[36],
		      (void *)&cpu_info[40],
		      (void *)&cpu_info[44]);
		cpuid(0x80860006,
		      (void *)&cpu_info[48],
		      (void *)&cpu_info[52],
		      (void *)&cpu_info[56],
		      (void *)&cpu_info[60]);
		cpu_info[64] = '\0';
		pr_info("CPU: %s\n", cpu_info);
	}

	/* Unhide possibly hidden capability flags */
	rdmsr(0x80860004, cap_mask, uk);
	wrmsr(0x80860004, ~0, uk);
	c->x86_capability[CPUID_1_EDX] = cpuid_edx(0x00000001);
	wrmsr(0x80860004, cap_mask, uk);

	/* All Transmeta CPUs have a constant TSC */
	set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC);

#ifdef CONFIG_SYSCTL
	/*
	 * randomize_va_space slows us down enormously;
	 * it probably triggers retranslation of x86->native bytecode
	 */
	randomize_va_space = 0;
#endif
}

static const struct cpu_dev transmeta_cpu_dev = {
	.c_vendor	= "Transmeta",
	.c_ident	= { "GenuineTMx86", "TransmetaCPU" },
	.c_early_init	= early_init_transmeta,
	.c_init		= init_transmeta,
	.c_x86_vendor	= X86_VENDOR_TRANSMETA,
};

cpu_dev_register(transmeta_cpu_dev);

Annotation

Implementation Notes