arch/ia64/kernel/machine_kexec.c

   1 /*
   2  * arch/ia64/kernel/machine_kexec.c
   3  *
   4  * Handle transition of Linux booting another kernel
   5  * Copyright (C) 2005 Hewlett-Packard Development Comapny, L.P.
   6  * Copyright (C) 2005 Khalid Aziz <khalid.aziz@hp.com>
   7  * Copyright (C) 2006 Intel Corp, Zou Nan hai <nanhai.zou@intel.com>
   8  *
   9  * This source code is licensed under the GNU General Public License,
  10  * Version 2.  See the file COPYING for more details.
  11  */
  12
  13 #include <linux/mm.h>
  14 #include <linux/kexec.h>
  15 #include <linux/cpu.h>
  16 #include <linux/irq.h>
  17 #include <linux/efi.h>
  18 #include <linux/numa.h>
  19 #include <linux/mmzone.h>
  20
  21 #include <asm/numa.h>
  22 #include <asm/mmu_context.h>
  23 #include <asm/setup.h>
  24 #include <asm/delay.h>
  25 #include <asm/meminit.h>
  26 #include <asm/processor.h>
  27
  28 typedef NORET_TYPE 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) ATTRIB_NORET;
  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 = (unsigned long)page_address(image->control_code_page);
  87         int ii;
  88
  89         BUG_ON(!image);
  90         if (image->type == KEXEC_TYPE_CRASH) {
  91                 crash_save_this_cpu();
  92                 current->thread.ksp = (__u64)info->sw - 16;
  93         }
  94
  95         /* Interrupts aren't acceptable while we reboot */
  96         local_irq_disable();
  97
  98         /* Mask CMC and Performance Monitor interrupts */
  99         ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
 100         ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);
 101
 102         /* Mask ITV and Local Redirect Registers */
 103         ia64_set_itv(1 << 16);
 104         ia64_set_lrr0(1 << 16);
 105         ia64_set_lrr1(1 << 16);
 106
 107         /* terminate possible nested in-service interrupts */
 108         for (ii = 0; ii < 16; ii++)
 109                 ia64_eoi();
 110
 111         /* unmask TPR and clear any pending interrupts */
 112         ia64_setreg(_IA64_REG_CR_TPR, 0);
 113         ia64_srlz_d();
 114         while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR)
 115                 ia64_eoi();
 116         platform_kernel_launch_event();
 117         rnk = (relocate_new_kernel_t)&code_addr;
 118         (*rnk)(image->head, image->start, ia64_boot_param,
 119                      GRANULEROUNDDOWN((unsigned long) pal_addr));
 120         BUG();
 121 }
 122
 123 void machine_kexec(struct kimage *image)
 124 {
 125         BUG_ON(!image);
 126         unw_init_running(ia64_machine_kexec, image);
 127         for(;;);
 128 }
 129
 130 void arch_crash_save_vmcoreinfo(void)
 131 {
 132 #if defined(CONFIG_DISCONTIGMEM) || defined(CONFIG_SPARSEMEM)
 133         VMCOREINFO_SYMBOL(pgdat_list);
 134         VMCOREINFO_LENGTH(pgdat_list, MAX_NUMNODES);
 135 #endif
 136 #ifdef CONFIG_NUMA
 137         VMCOREINFO_SYMBOL(node_memblk);
 138         VMCOREINFO_LENGTH(node_memblk, NR_NODE_MEMBLKS);
 139         VMCOREINFO_STRUCT_SIZE(node_memblk_s);
 140         VMCOREINFO_OFFSET(node_memblk_s, start_paddr);
 141         VMCOREINFO_OFFSET(node_memblk_s, size);
 142 #endif
 143 #ifdef CONFIG_PGTABLE_3
 144         VMCOREINFO_CONFIG(PGTABLE_3);
 145 #elif  CONFIG_PGTABLE_4
 146         VMCOREINFO_CONFIG(PGTABLE_4);
 147 #endif
 148 }
 149
 150 unsigned long paddr_vmcoreinfo_note(void)
 151 {
 152         return ia64_tpa((unsigned long)(char *)&vmcoreinfo_note);
 153 }
 154