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