arch/mips/sgi-ip27/ip27-init.c

Source file repositories/reference/linux-study-clean/arch/mips/sgi-ip27/ip27-init.c

File Facts

System
Linux kernel
Corpus path
arch/mips/sgi-ip27/ip27-init.c
Extension
.c
Size
3528 bytes
Lines
148
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

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/mm.h>
#include <linux/export.h>
#include <linux/cpumask.h>
#include <asm/bootinfo.h>
#include <asm/cpu.h>
#include <asm/io.h>
#include <asm/sgialib.h>
#include <asm/time.h>
#include <asm/sn/agent.h>
#include <asm/sn/types.h>
#include <asm/sn/klconfig.h>
#include <asm/sn/ioc3.h>
#include <asm/mipsregs.h>
#include <asm/sn/gda.h>
#include <asm/sn/intr.h>
#include <asm/current.h>
#include <asm/processor.h>
#include <asm/mmu_context.h>
#include <asm/thread_info.h>
#include <asm/sn/launch.h>
#include <asm/sn/mapped_kernel.h>

#include "ip27-common.h"

#define CPU_NONE		(cpuid_t)-1

static DECLARE_BITMAP(hub_init_mask, MAX_NUMNODES);
nasid_t master_nasid = INVALID_NASID;

struct cpuinfo_ip27 sn_cpu_info[NR_CPUS];
EXPORT_SYMBOL_GPL(sn_cpu_info);

static void per_hub_init(nasid_t nasid)
{
	struct hub_data *hub = hub_data(nasid);

	cpumask_set_cpu(smp_processor_id(), &hub->h_cpus);

	if (test_and_set_bit(nasid, hub_init_mask))
		return;
	/*
	 * Set CRB timeout at 5ms, (< PI timeout of 10ms)
	 */
	REMOTE_HUB_S(nasid, IIO_ICTP, 0x800);
	REMOTE_HUB_S(nasid, IIO_ICTO, 0xff);

	hub_rtc_init(nasid);

	if (nasid) {
		/* copy exception handlers from first node to current node */
		memcpy((void *)NODE_OFFSET_TO_K0(nasid, 0),
		       (void *)CKSEG0, 0x200);
		__flush_cache_all();
		/* switch to node local exception handlers */
		REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_8K);
	}
}

void per_cpu_init(void)
{
	int cpu = smp_processor_id();
	nasid_t nasid = get_nasid();

	clear_c0_status(ST0_IM);

	per_hub_init(nasid);

	pr_info("CPU %d clock is %dMHz.\n", cpu, sn_cpu_info[cpu].p_speed);

	install_ipi();

	/* Install our NMI handler if symmon hasn't installed one. */
	install_cpu_nmi_handler(cputoslice(cpu));

	enable_percpu_irq(IP27_HUB_PEND0_IRQ, IRQ_TYPE_NONE);
	enable_percpu_irq(IP27_HUB_PEND1_IRQ, IRQ_TYPE_NONE);
}

void __init plat_mem_setup(void)
{
	u64 p, e, n_mode;
	nasid_t nid;

	register_smp_ops(&ip27_smp_ops);

	ip27_reboot_setup();

Annotation

Implementation Notes