arch/ia64/kernel/machine_kexec.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/ia64/kernel/machine_kexec.c
   4  *
   5  * Handle transition of Linux booting another kernel
   6  * Copyright (C) 2005 Hewlett-Packard Development Comapny, L.P.
   7  * Copyright (C) 2005 Khalid Aziz <khalid.aziz@hp.com>
   8  * Copyright (C) 2006 Intel Corp, Zou Nan hai <nanhai.zou@intel.com>
   9  */
  10
  11 #include <linux/mm.h>
  12 #include <linux/kexec.h>
  13 #include <linux/cpu.h>
  14 #include <linux/irq.h>
  15 #include <linux/efi.h>
  16 #include <linux/numa.h>
  17 #include <linux/mmzone.h>
  18
  19 #include <asm/numa.h>
  20 #include <asm/mmu_context.h>
  21 #include <asm/setup.h>
  22 #include <asm/delay.h>
  23 #include <asm/meminit.h>
  24 #include <asm/processor.h>
  25 #include <asm/sal.h>
  26 #include <asm/mca.h>
  27
  28 typedef void (*relocate_new_kernel_t)(
  29                                         unsigned long indirection_page,
  30                                         unsigned long start_address,
  31                                         struct ia64_boot_param *boot_param,
  32                                         unsigned long pal_addr) __noreturn;
  33
  34 struct kimage *ia64_kimage;
  35
  36 struct resource efi_memmap_res = {
  37         .name  = "EFI Memory Map",
  38         .start = 0,
  39         .end   = 0,
  40         .flags = IORESOURCE_BUSY | IORESOURCE_MEM
  41 };
  42
  43 struct resource boot_param_res = {
  44         .name  = "Boot parameter",
  45         .start = 0,
  46         .end   = 0,
  47         .flags = IORESOURCE_BUSY | IORESOURCE_MEM
  48 };
  49
  50
  51 /*
  52  * Do what every setup is needed on image and the
  53  * reboot code buffer to allow us to avoid allocations
  54  * later.
  55  */
  56 int machine_kexec_prepare(struct kimage *image)
  57 {
  58         void *control_code_buffer;
  59         const unsigned long *func;
  60
  61         func = (unsigned long *)&relocate_new_kernel;
  62         /* Pre-load control code buffer to minimize work in kexec path */
  63         control_code_buffer = page_address(image->control_code_page);
  64         memcpy((void *)control_code_buffer, (const void *)func[0],
  65                         relocate_new_kernel_size);
  66         flush_icache_range((unsigned long)control_code_buffer,
  67                         (unsigned long)control_code_buffer + relocate_new_kernel_size);
  68         ia64_kimage = image;
  69
  70         return 0;
  71 }
  72
  73 void machine_kexec_cleanup(struct kimage *image)
  74 {
  75 }
  76
  77 /*
  78  * Do not allocate memory (or fail in any way) in machine_kexec().
  79  * We are past the point of no return, committed to rebooting now.
  80  */
  81 static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
  82 {
  83         struct kimage *image = arg;
  84         relocate_new_kernel_t rnk;
  85         void *pal_addr = efi_get_pal_addr();
  86         unsigned long code_addr;
  87         int ii;
  88         u64 fp, gp;
  89         ia64_fptr_t *init_handler = (ia64_fptr_t *)ia64_os_init_on_kdump;
  90
  91         BUG_ON(!image);
  92         code_addr = (unsigned long)page_address(image->control_code_page);
  93         if (image->type == KEXEC_TYPE_CRASH) {
  94                 crash_save_this_cpu();
  95                 current->thread.ksp = (__u64)info->sw - 16;
  96
  97                 /* Register noop init handler */
  98                 fp = ia64_tpa(init_handler->fp);
  99                 gp = ia64_tpa(ia64_getreg(_IA64_REG_GP));
 100                 ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, fp, gp, 0, fp, gp, 0);
 101         } else {
 102                 /* Unregister init handlers of current kernel */
 103                 ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, 0, 0, 0, 0, 0, 0);
 104         }
 105
 106         /* Unregister mca handler - No more recovery on current kernel */
 107         ia64_sal_set_vectors(SAL_VECTOR_OS_MCA, 0, 0, 0, 0, 0, 0);
 108
 109         /* Interrupts aren't acceptable while we reboot */
 110         local_irq_disable();
 111
 112         /* Mask CMC and Performance Monitor interrupts */
 113         ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
 114         ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);
 115
 116         /* Mask ITV and Local Redirect Registers */
 117         ia64_set_itv(1 << 16);
 118         ia64_set_lrr0(1 << 16);
 119         ia64_set_lrr1(1 << 16);
 120
 121         /* terminate possible nested in-service interrupts */
 122         for (ii = 0; ii < 16; ii++)
 123                 ia64_eoi();
 124
 125         /* unmask TPR and clear any pending interrupts */
 126         ia64_setreg(_IA64_REG_CR_TPR, 0);
 127         ia64_srlz_d();
 128         while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR)
 129                 ia64_eoi();
 130         rnk = (relocate_new_kernel_t)&code_addr;
 131         (*rnk)(image->head, image->start, ia64_boot_param,
 132                      GRANULEROUNDDOWN((unsigned long) pal_addr));
 133         BUG();
 134 }
 135
 136 void machine_kexec(struct kimage *image)
 137 {
 138         BUG_ON(!image);
 139         unw_init_running(ia64_machine_kexec, image);
 140         for(;;);
 141 }
 142
 143 void arch_crash_save_vmcoreinfo(void)
 144 {
 145 #if defined(CONFIG_DISCONTIGMEM) || defined(CONFIG_SPARSEMEM)
 146         VMCOREINFO_SYMBOL(pgdat_list);
 147         VMCOREINFO_LENGTH(pgdat_list, MAX_NUMNODES);
 148 #endif
 149 #ifdef CONFIG_NUMA
 150         VMCOREINFO_SYMBOL(node_memblk);
 151         VMCOREINFO_LENGTH(node_memblk, NR_NODE_MEMBLKS);
 152         VMCOREINFO_STRUCT_SIZE(node_memblk_s);
 153         VMCOREINFO_OFFSET(node_memblk_s, start_paddr);
 154         VMCOREINFO_OFFSET(node_memblk_s, size);
 155 #endif
 156 #if CONFIG_PGTABLE_LEVELS == 3
 157         VMCOREINFO_CONFIG(PGTABLE_3);
 158 #elif CONFIG_PGTABLE_LEVELS == 4
 159         VMCOREINFO_CONFIG(PGTABLE_4);
 160 #endif
 161 }
 162