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/efi.h>
  20 #include <asm/numa.h>
  21 #include <asm/mmu_context.h>
  22 #include <asm/setup.h>
  23 #include <asm/delay.h>
  24 #include <asm/meminit.h>
  25 #include <asm/processor.h>
  26 #include <asm/sal.h>
  27 #include <asm/mca.h>
  28
  29 typedef void (*relocate_new_kernel_t)(
  30                                         unsigned long indirection_page,
  31                                         unsigned long start_address,
  32                                         struct ia64_boot_param *boot_param,
  33                                         unsigned long pal_addr) __noreturn;
  34
  35 struct kimage *ia64_kimage;
  36
  37 struct resource efi_memmap_res = {
  38         .name  = "EFI Memory Map",
  39         .start = 0,
  40         .end   = 0,
  41         .flags = IORESOURCE_BUSY | IORESOURCE_MEM
  42 };
  43
  44 struct resource boot_param_res = {
  45         .name  = "Boot parameter",
  46         .start = 0,
  47         .end   = 0,
  48         .flags = IORESOURCE_BUSY | IORESOURCE_MEM
  49 };
  50
  51
  52 /*
  53  * Do what every setup is needed on image and the
  54  * reboot code buffer to allow us to avoid allocations
  55  * later.
  56  */
  57 int machine_kexec_prepare(struct kimage *image)
  58 {
  59         void *control_code_buffer;
  60         const unsigned long *func;
  61
  62         func = (unsigned long *)&relocate_new_kernel;
  63         /* Pre-load control code buffer to minimize work in kexec path */
  64         control_code_buffer = page_address(image->control_code_page);
  65         memcpy((void *)control_code_buffer, (const void *)func[0],
  66                         relocate_new_kernel_size);
  67         flush_icache_range((unsigned long)control_code_buffer,
  68                         (unsigned long)control_code_buffer + relocate_new_kernel_size);
  69         ia64_kimage = image;
  70
  71         return 0;
  72 }
  73
  74 void machine_kexec_cleanup(struct kimage *image)
  75 {
  76 }
  77
  78 /*
  79  * Do not allocate memory (or fail in any way) in machine_kexec().
  80  * We are past the point of no return, committed to rebooting now.
  81  */
  82 static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
  83 {
  84         struct kimage *image = arg;
  85         relocate_new_kernel_t rnk;
  86         void *pal_addr = efi_get_pal_addr();
  87         unsigned long code_addr;
  88         int ii;
  89         u64 fp, gp;
  90         ia64_fptr_t *init_handler = (ia64_fptr_t *)ia64_os_init_on_kdump;
  91
  92         BUG_ON(!image);
  93         code_addr = (unsigned long)page_address(image->control_code_page);
  94         if (image->type == KEXEC_TYPE_CRASH) {
  95                 crash_save_this_cpu();
  96                 current->thread.ksp = (__u64)info->sw - 16;
  97
  98                 /* Register noop init handler */
  99                 fp = ia64_tpa(init_handler->fp);
 100                 gp = ia64_tpa(ia64_getreg(_IA64_REG_GP));
 101                 ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, fp, gp, 0, fp, gp, 0);
 102         } else {
 103                 /* Unregister init handlers of current kernel */
 104                 ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, 0, 0, 0, 0, 0, 0);
 105         }
 106
 107         /* Unregister mca handler - No more recovery on current kernel */
 108         ia64_sal_set_vectors(SAL_VECTOR_OS_MCA, 0, 0, 0, 0, 0, 0);
 109
 110         /* Interrupts aren't acceptable while we reboot */
 111         local_irq_disable();
 112
 113         /* Mask CMC and Performance Monitor interrupts */
 114         ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
 115         ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);
 116
 117         /* Mask ITV and Local Redirect Registers */
 118         ia64_set_itv(1 << 16);
 119         ia64_set_lrr0(1 << 16);
 120         ia64_set_lrr1(1 << 16);
 121
 122         /* terminate possible nested in-service interrupts */
 123         for (ii = 0; ii < 16; ii++)
 124                 ia64_eoi();
 125
 126         /* unmask TPR and clear any pending interrupts */
 127         ia64_setreg(_IA64_REG_CR_TPR, 0);
 128         ia64_srlz_d();
 129         while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR)
 130                 ia64_eoi();
 131         rnk = (relocate_new_kernel_t)&code_addr;
 132         (*rnk)(image->head, image->start, ia64_boot_param,
 133                      GRANULEROUNDDOWN((unsigned long) pal_addr));
 134         BUG();
 135 }
 136
 137 void machine_kexec(struct kimage *image)
 138 {
 139         BUG_ON(!image);
 140         unw_init_running(ia64_machine_kexec, image);
 141         for(;;);
 142 }
 143
 144 void arch_crash_save_vmcoreinfo(void)
 145 {
 146 #if defined(CONFIG_SPARSEMEM)
 147         VMCOREINFO_SYMBOL(pgdat_list);
 148         VMCOREINFO_LENGTH(pgdat_list, MAX_NUMNODES);
 149 #endif
 150 #ifdef CONFIG_NUMA
 151         VMCOREINFO_SYMBOL(node_memblk);
 152         VMCOREINFO_LENGTH(node_memblk, NR_NODE_MEMBLKS);
 153         VMCOREINFO_STRUCT_SIZE(node_memblk_s);
 154         VMCOREINFO_OFFSET(node_memblk_s, start_paddr);
 155         VMCOREINFO_OFFSET(node_memblk_s, size);
 156 #endif
 157 #if CONFIG_PGTABLE_LEVELS == 3
 158         VMCOREINFO_CONFIG(PGTABLE_3);
 159 #elif CONFIG_PGTABLE_LEVELS == 4
 160         VMCOREINFO_CONFIG(PGTABLE_4);
 161 #endif
 162 }
 163