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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127// 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);