arch/mips/kernel/proc.c

Source file repositories/reference/linux-study-clean/arch/mips/kernel/proc.c

File Facts

System
Linux kernel
Corpus path
arch/mips/kernel/proc.c
Extension
.c
Size
8632 bytes
Lines
331
Domain
Architecture Layer
Bucket
arch/mips
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

// SPDX-License-Identifier: GPL-2.0
/*
 *  Copyright (C) 1995, 1996, 2001  Ralf Baechle
 *  Copyright (C) 2001, 2004  MIPS Technologies, Inc.
 *  Copyright (C) 2004	Maciej W. Rozycki
 */
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/seq_file.h>
#include <asm/bootinfo.h>
#include <asm/cpu.h>
#include <asm/cpu-features.h>
#include <asm/idle.h>
#include <asm/mipsregs.h>
#include <asm/processor.h>
#include <asm/prom.h>

unsigned int vced_count, vcei_count;

/*
 * No lock; only written during early bootup by CPU 0.
 */
static RAW_NOTIFIER_HEAD(proc_cpuinfo_chain);

int __ref register_proc_cpuinfo_notifier(struct notifier_block *nb)
{
	return raw_notifier_chain_register(&proc_cpuinfo_chain, nb);
}

int proc_cpuinfo_notifier_call_chain(unsigned long val, void *v)
{
	return raw_notifier_call_chain(&proc_cpuinfo_chain, val, v);
}

static int show_cpuinfo(struct seq_file *m, void *v)
{
	struct proc_cpuinfo_notifier_args proc_cpuinfo_notifier_args;
	unsigned long n = (unsigned long) v - 1;
	unsigned int version = cpu_data[n].processor_id;
	unsigned int fp_vers = cpu_data[n].fpu_id;
	char fmt[64];
	int i;

#ifdef CONFIG_SMP
	if (!cpu_online(n))
		return 0;
#endif

	/*
	 * For the first processor also print the system type
	 */
	if (n == 0) {
		seq_printf(m, "system type\t\t: %s\n", get_system_type());
		if (mips_get_machine_name())
			seq_printf(m, "machine\t\t\t: %s\n",
				   mips_get_machine_name());
	}

	seq_printf(m, "processor\t\t: %ld\n", n);
	sprintf(fmt, "cpu model\t\t: %%s V%%d.%%d%s\n",
		      cpu_data[n].options & MIPS_CPU_FPU ? "  FPU V%d.%d" : "");
	seq_printf(m, fmt, __cpu_name[n],
		      (version >> 4) & 0x0f, version & 0x0f,
		      (fp_vers >> 4) & 0x0f, fp_vers & 0x0f);
	seq_printf(m, "BogoMIPS\t\t: %u.%02u\n",
		      cpu_data[n].udelay_val / (500000/HZ),
		      (cpu_data[n].udelay_val / (5000/HZ)) % 100);
	seq_printf(m, "wait instruction\t: %s\n", str_yes_no(cpu_wait));
	seq_printf(m, "microsecond timers\t: %s\n",
		      str_yes_no(cpu_has_counter));
	seq_printf(m, "tlb_entries\t\t: %d\n", cpu_data[n].tlbsize);
	seq_printf(m, "extra interrupt vector\t: %s\n",
		      str_yes_no(cpu_has_divec));
	seq_printf(m, "hardware watchpoint\t: %s", str_yes_no(cpu_has_watch));
	if (cpu_has_watch) {
		seq_printf(m, ", count: %d, address/irw mask: [",
		      cpu_data[n].watch_reg_count);
		for (i = 0; i < cpu_data[n].watch_reg_count; i++)
			seq_printf(m, "%s0x%04x", i ? ", " : "",
				cpu_data[n].watch_reg_masks[i]);
		seq_putc(m, ']');
	}

	seq_puts(m, "\nisa\t\t\t:");
	if (cpu_has_mips_1)
		seq_puts(m, " mips1");
	if (cpu_has_mips_2)
		seq_puts(m, " mips2");
	if (cpu_has_mips_3)

Annotation

Implementation Notes