arch/parisc/kernel/toc.c

Source file repositories/reference/linux-study-clean/arch/parisc/kernel/toc.c

File Facts

System
Linux kernel
Corpus path
arch/parisc/kernel/toc.c
Extension
.c
Size
3124 bytes
Lines
127
Domain
Architecture Layer
Bucket
arch/parisc
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

#include <linux/kernel.h>
#include <linux/kgdb.h>
#include <linux/printk.h>
#include <linux/sched/debug.h>
#include <linux/delay.h>
#include <linux/reboot.h>

#include <asm/pdc.h>
#include <asm/pdc_chassis.h>
#include <asm/ldcw.h>
#include <asm/processor.h>

static unsigned int __aligned(16) toc_lock = 1;
DEFINE_PER_CPU_PAGE_ALIGNED(char [16384], toc_stack) __visible;

static void toc20_to_pt_regs(struct pt_regs *regs, struct pdc_toc_pim_20 *toc)
{
	int i;

	regs->gr[0] = (unsigned long)toc->cr[22];

	for (i = 1; i < 32; i++)
		regs->gr[i] = (unsigned long)toc->gr[i];

	for (i = 0; i < 8; i++)
		regs->sr[i] = (unsigned long)toc->sr[i];

	regs->iasq[0] = (unsigned long)toc->cr[17];
	regs->iasq[1] = (unsigned long)toc->iasq_back;
	regs->iaoq[0] = (unsigned long)toc->cr[18];
	regs->iaoq[1] = (unsigned long)toc->iaoq_back;

	regs->sar = (unsigned long)toc->cr[11];
	regs->iir = (unsigned long)toc->cr[19];
	regs->isr = (unsigned long)toc->cr[20];
	regs->ior = (unsigned long)toc->cr[21];
}

static void toc11_to_pt_regs(struct pt_regs *regs, struct pdc_toc_pim_11 *toc)
{
	int i;

	regs->gr[0] = toc->cr[22];

	for (i = 1; i < 32; i++)
		regs->gr[i] = toc->gr[i];

	for (i = 0; i < 8; i++)
		regs->sr[i] = toc->sr[i];

	regs->iasq[0] = toc->cr[17];
	regs->iasq[1] = toc->iasq_back;
	regs->iaoq[0] = toc->cr[18];
	regs->iaoq[1] = toc->iaoq_back;

	regs->sar  = toc->cr[11];
	regs->iir  = toc->cr[19];
	regs->isr  = toc->cr[20];
	regs->ior  = toc->cr[21];
}

void notrace __noreturn __cold toc_intr(struct pt_regs *regs)
{
	struct pdc_toc_pim_20 pim_data20;
	struct pdc_toc_pim_11 pim_data11;

	/* verify we wrote regs to the correct stack */
	BUG_ON(regs != (struct pt_regs *)&per_cpu(toc_stack, raw_smp_processor_id()));

	if (boot_cpu_data.cpu_type >= pcxu) {
		if (pdc_pim_toc20(&pim_data20))
			panic("Failed to get PIM data");
		toc20_to_pt_regs(regs, &pim_data20);
	} else {
		if (pdc_pim_toc11(&pim_data11))
			panic("Failed to get PIM data");
		toc11_to_pt_regs(regs, &pim_data11);
	}

#ifdef CONFIG_KGDB
	nmi_enter();

	if (atomic_read(&kgdb_active) != -1)
		kgdb_nmicallback(raw_smp_processor_id(), regs);
	kgdb_handle_exception(9, SIGTRAP, 0, regs);
#endif

	/* serialize output, otherwise all CPUs write backtrace at once */

Annotation

Implementation Notes