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