arch/mips/kernel/cpu-r3k-probe.c

Source file repositories/reference/linux-study-clean/arch/mips/kernel/cpu-r3k-probe.c

File Facts

System
Linux kernel
Corpus path
arch/mips/kernel/cpu-r3k-probe.c
Extension
.c
Size
3632 bytes
Lines
154
Domain
Architecture Layer
Bucket
arch/mips
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration 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 ((c->processor_id & PRID_REV_MASK) == PRID_REV_R3000A) {
			if (cpu_has_confreg()) {
				c->cputype = CPU_R3081E;
				__cpu_name[cpu] = "R3081";
			} else {
				c->cputype = CPU_R3000A;
				__cpu_name[cpu] = "R3000A";
			}
		} else {
			c->cputype = CPU_R3000;
			__cpu_name[cpu] = "R3000";
		}
		c->options = MIPS_CPU_TLB | MIPS_CPU_3K_CACHE |
			     MIPS_CPU_NOFPUEX;
		if (__cpu_has_fpu())
			c->options |= MIPS_CPU_FPU;
		c->tlbsize = 64;
		break;
	}

	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
	 * manually setup otherwise it could trigger some nasty bugs.
	 */
	BUG_ON(current_cpu_type() != c->cputype);

	if (mips_fpu_disabled)
		c->options &= ~MIPS_CPU_FPU;

	if (c->options & MIPS_CPU_FPU)
		cpu_set_fpu_opts(c);
	else
		cpu_set_nofpu_opts(c);

	c->vmbits = 31;

	reserve_exception_space(0, 0x400);
}

void cpu_report(void)
{
	struct cpuinfo_mips *c = &current_cpu_data;

	pr_info("CPU%d revision is: %08x (%s)\n",
		smp_processor_id(), c->processor_id, cpu_name_string());
	if (c->options & MIPS_CPU_FPU)
		pr_info("FPU revision is: %08x\n", c->fpu_id);
}

Annotation

Implementation Notes