diff options
Diffstat (limited to 'arch/parisc/kernel/toc.c')
-rw-r--r-- | arch/parisc/kernel/toc.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/arch/parisc/kernel/toc.c b/arch/parisc/kernel/toc.c new file mode 100644 index 000000000000..18327611cf8f --- /dev/null +++ b/arch/parisc/kernel/toc.c @@ -0,0 +1,111 @@ +// 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> + +unsigned int __aligned(16) toc_lock = 1; + +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; + + nmi_enter(); + + 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 + if (atomic_read(&kgdb_active) != -1) + kgdb_nmicallback(raw_smp_processor_id(), regs); + kgdb_handle_exception(9, SIGTRAP, 0, regs); +#endif + show_regs(regs); + + /* 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); |