127 lines
3.1 KiB
C
127 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/kernel.h>
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#include <linux/kgdb.h>
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#include <linux/printk.h>
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#include <linux/sched/debug.h>
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#include <linux/delay.h>
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#include <linux/reboot.h>
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#include <asm/pdc.h>
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#include <asm/pdc_chassis.h>
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#include <asm/ldcw.h>
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#include <asm/processor.h>
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static unsigned int __aligned(16) toc_lock = 1;
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DEFINE_PER_CPU_PAGE_ALIGNED(char [16384], toc_stack) __visible;
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static void toc20_to_pt_regs(struct pt_regs *regs, struct pdc_toc_pim_20 *toc)
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{
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int i;
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regs->gr[0] = (unsigned long)toc->cr[22];
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for (i = 1; i < 32; i++)
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regs->gr[i] = (unsigned long)toc->gr[i];
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for (i = 0; i < 8; i++)
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regs->sr[i] = (unsigned long)toc->sr[i];
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regs->iasq[0] = (unsigned long)toc->cr[17];
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regs->iasq[1] = (unsigned long)toc->iasq_back;
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regs->iaoq[0] = (unsigned long)toc->cr[18];
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regs->iaoq[1] = (unsigned long)toc->iaoq_back;
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regs->sar = (unsigned long)toc->cr[11];
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regs->iir = (unsigned long)toc->cr[19];
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regs->isr = (unsigned long)toc->cr[20];
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regs->ior = (unsigned long)toc->cr[21];
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}
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static void toc11_to_pt_regs(struct pt_regs *regs, struct pdc_toc_pim_11 *toc)
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{
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int i;
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regs->gr[0] = toc->cr[22];
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for (i = 1; i < 32; i++)
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regs->gr[i] = toc->gr[i];
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for (i = 0; i < 8; i++)
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regs->sr[i] = toc->sr[i];
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regs->iasq[0] = toc->cr[17];
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regs->iasq[1] = toc->iasq_back;
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regs->iaoq[0] = toc->cr[18];
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regs->iaoq[1] = toc->iaoq_back;
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regs->sar = toc->cr[11];
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regs->iir = toc->cr[19];
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regs->isr = toc->cr[20];
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regs->ior = toc->cr[21];
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}
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void notrace __noreturn __cold toc_intr(struct pt_regs *regs)
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{
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struct pdc_toc_pim_20 pim_data20;
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struct pdc_toc_pim_11 pim_data11;
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/* verify we wrote regs to the correct stack */
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BUG_ON(regs != (struct pt_regs *)&per_cpu(toc_stack, raw_smp_processor_id()));
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if (boot_cpu_data.cpu_type >= pcxu) {
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if (pdc_pim_toc20(&pim_data20))
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panic("Failed to get PIM data");
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toc20_to_pt_regs(regs, &pim_data20);
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} else {
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if (pdc_pim_toc11(&pim_data11))
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panic("Failed to get PIM data");
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toc11_to_pt_regs(regs, &pim_data11);
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}
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#ifdef CONFIG_KGDB
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nmi_enter();
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if (atomic_read(&kgdb_active) != -1)
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kgdb_nmicallback(raw_smp_processor_id(), regs);
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kgdb_handle_exception(9, SIGTRAP, 0, regs);
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#endif
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/* serialize output, otherwise all CPUs write backtrace at once */
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while (__ldcw(&toc_lock) == 0)
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; /* wait */
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show_regs(regs);
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toc_lock = 1; /* release lock for next CPU */
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if (raw_smp_processor_id() != 0)
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while (1) ; /* all but monarch CPU will wait endless. */
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/* give other CPUs time to show their backtrace */
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mdelay(2000);
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machine_restart("TOC");
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/* should never reach this */
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panic("TOC");
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}
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static __init int setup_toc(void)
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{
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unsigned int csum = 0;
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unsigned long toc_code = (unsigned long)dereference_function_descriptor(toc_handler);
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int i;
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PAGE0->vec_toc = __pa(toc_code) & 0xffffffff;
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#ifdef CONFIG_64BIT
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PAGE0->vec_toc_hi = __pa(toc_code) >> 32;
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#endif
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PAGE0->vec_toclen = toc_handler_size;
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for (i = 0; i < toc_handler_size/4; i++)
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csum += ((u32 *)toc_code)[i];
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toc_handler_csum = -csum;
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pr_info("TOC handler registered\n");
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return 0;
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}
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early_initcall(setup_toc);
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