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 #include <asm/mmu_context.h>
  21 #include <asm/setup.h>
  22 #include <asm/delay.h>
  23 #include <asm/meminit.h>
  24
  25 typedef NORET_TYPE void (*relocate_new_kernel_t)(
  26                                         unsigned long indirection_page,
  27                                         unsigned long start_address,
  28                                         struct ia64_boot_param *boot_param,
  29                                         unsigned long pal_addr) ATTRIB_NORET;
  30
  31 struct kimage *ia64_kimage;
  32
  33 struct resource efi_memmap_res = {
  34         .name  = "EFI Memory Map",
  35         .start = 0,
  36         .end   = 0,
  37         .flags = IORESOURCE_BUSY | IORESOURCE_MEM
  38 };
  39
  40 struct resource boot_param_res = {
  41         .name  = "Boot parameter",
  42         .start = 0,
  43         .end   = 0,
  44         .flags = IORESOURCE_BUSY | IORESOURCE_MEM
  45 };
  46
  47
  48 /*
  49  * Do what every setup is needed on image and the
  50  * reboot code buffer to allow us to avoid allocations
  51  * later.
  52  */
  53 int machine_kexec_prepare(struct kimage *image)
  54 {
  55         void *control_code_buffer;
  56         const unsigned long *func;
  57
  58         func = (unsigned long *)&relocate_new_kernel;
  59         /* Pre-load control code buffer to minimize work in kexec path */
  60         control_code_buffer = page_address(image->control_code_page);
  61         memcpy((void *)control_code_buffer, (const void *)func[0],
  62                         relocate_new_kernel_size);
  63         flush_icache_range((unsigned long)control_code_buffer,
  64                         (unsigned long)control_code_buffer + relocate_new_kernel_size);
  65         ia64_kimage = image;
  66
  67         return 0;
  68 }
  69
  70 void machine_kexec_cleanup(struct kimage *image)
  71 {
  72 }
  73
  74 /*
  75  * Do not allocate memory (or fail in any way) in machine_kexec().
  76  * We are past the point of no return, committed to rebooting now.
  77  */
  78 static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
  79 {
  80         struct kimage *image = arg;
  81         relocate_new_kernel_t rnk;
  82         void *pal_addr = efi_get_pal_addr();
  83         unsigned long code_addr = (unsigned long)page_address(image->control_code_page);
  84         int ii;
  85
  86         BUG_ON(!image);
  87         if (image->type == KEXEC_TYPE_CRASH) {
  88                 crash_save_this_cpu();
  89                 current->thread.ksp = (__u64)info->sw - 16;
  90         }
  91
  92         /* Interrupts aren't acceptable while we reboot */
  93         local_irq_disable();
  94
  95         /* Mask CMC and Performance Monitor interrupts */
  96         ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
  97         ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);
  98
  99         /* Mask ITV and Local Redirect Registers */
 100         ia64_set_itv(1 << 16);
 101         ia64_set_lrr0(1 << 16);
 102         ia64_set_lrr1(1 << 16);
 103
 104         /* terminate possible nested in-service interrupts */
 105         for (ii = 0; ii < 16; ii++)
 106                 ia64_eoi();
 107
 108         /* unmask TPR and clear any pending interrupts */
 109         ia64_setreg(_IA64_REG_CR_TPR, 0);
 110         ia64_srlz_d();
 111         while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR)
 112                 ia64_eoi();
 113         platform_kernel_launch_event();
 114         rnk = (relocate_new_kernel_t)&code_addr;
 115         (*rnk)(image->head, image->start, ia64_boot_param,
 116                      GRANULEROUNDDOWN((unsigned long) pal_addr));
 117         BUG();
 118 }
 119
 120 void machine_kexec(struct kimage *image)
 121 {
 122         BUG_ON(!image);
 123         unw_init_running(ia64_machine_kexec, image);
 124         for(;;);
 125 }
 126
 127 void arch_crash_save_vmcoreinfo(void)
 128 {
 129 #ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE
 130         SYMBOL(pgdat_list);
 131         LENGTH(pgdat_list, MAX_NUMNODES);
 132
 133         SYMBOL(node_memblk);
 134         LENGTH(node_memblk, NR_NODE_MEMBLKS);
 135         SIZE(node_memblk_s);
 136         OFFSET(node_memblk_s, start_paddr);
 137         OFFSET(node_memblk_s, size);
 138 #endif
 139 #ifdef CONFIG_PGTABLE_3
 140         CONFIG(PGTABLE_3);
 141 #elif  CONFIG_PGTABLE_4
 142         CONFIG(PGTABLE_4);
 143 #endif
 144 }
 145
 146 unsigned long paddr_vmcoreinfo_note(void)
 147 {
 148         unsigned long vaddr, paddr;
 149         vaddr = (unsigned long)(char *)&vmcoreinfo_note;
 150         asm volatile ("tpa %0 = %1" : "=r"(paddr) : "r"(vaddr) : "memory");
 151         return paddr;
 152 }
 153