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- // 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 */
- while (__ldcw(&toc_lock) == 0)
- ; /* wait */
- show_regs(regs);
- toc_lock = 1; /* release lock for next CPU */
- if (raw_smp_processor_id() != 0)
- while (1) ; /* all but monarch CPU will wait endless. */
- /* give other CPUs time to show their backtrace */
- mdelay(2000);
- machine_restart("TOC");
- /* should never reach this */
- panic("TOC");
- }
- static __init int setup_toc(void)
- {
- unsigned int csum = 0;
- unsigned long toc_code = (unsigned long)dereference_function_descriptor(toc_handler);
- int i;
- PAGE0->vec_toc = __pa(toc_code) & 0xffffffff;
- #ifdef CONFIG_64BIT
- PAGE0->vec_toc_hi = __pa(toc_code) >> 32;
- #endif
- PAGE0->vec_toclen = toc_handler_size;
- for (i = 0; i < toc_handler_size/4; i++)
- csum += ((u32 *)toc_code)[i];
- toc_handler_csum = -csum;
- pr_info("TOC handler registered\n");
- return 0;
- }
- early_initcall(setup_toc);
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