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