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   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 #include <asm/processor.h>
  25
  26 typedef NORET_TYPE void (*relocate_new_kernel_t)(
  27                                         unsigned long indirection_page,
  28                                         unsigned long start_address,
  29                                         struct ia64_boot_param *boot_param,
  30                                         unsigned long pal_addr) ATTRIB_NORET;
  31
  32 struct kimage *ia64_kimage;
  33
  34 struct resource efi_memmap_res = {
  35         .name  = "EFI Memory Map",
  36         .start = 0,
  37         .end   = 0,
  38         .flags = IORESOURCE_BUSY | IORESOURCE_MEM
  39 };
  40
  41 struct resource boot_param_res = {
  42         .name  = "Boot parameter",
  43         .start = 0,
  44         .end   = 0,
  45         .flags = IORESOURCE_BUSY | IORESOURCE_MEM
  46 };
  47
  48
  49 /*
  50  * Do what every setup is needed on image and the
  51  * reboot code buffer to allow us to avoid allocations
  52  * later.
  53  */
  54 int machine_kexec_prepare(struct kimage *image)
  55 {
  56         void *control_code_buffer;
  57         const unsigned long *func;
  58
  59         func = (unsigned long *)&relocate_new_kernel;
  60         /* Pre-load control code buffer to minimize work in kexec path */
  61         control_code_buffer = page_address(image->control_code_page);
  62         memcpy((void *)control_code_buffer, (const void *)func[0],
  63                         relocate_new_kernel_size);
  64         flush_icache_range((unsigned long)control_code_buffer,
  65                         (unsigned long)control_code_buffer + relocate_new_kernel_size);
  66         ia64_kimage = image;
  67
  68         return 0;
  69 }
  70
  71 void machine_kexec_cleanup(struct kimage *image)
  72 {
  73 }
  74
  75 /*
  76  * Do not allocate memory (or fail in any way) in machine_kexec().
  77  * We are past the point of no return, committed to rebooting now.
  78  */
  79 static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
  80 {
  81         struct kimage *image = arg;
  82         relocate_new_kernel_t rnk;
  83         void *pal_addr = efi_get_pal_addr();
  84         unsigned long code_addr = (unsigned long)page_address(image->control_code_page);
  85         int ii;
  86
  87         BUG_ON(!image);
  88         if (image->type == KEXEC_TYPE_CRASH) {
  89                 crash_save_this_cpu();
  90                 current->thread.ksp = (__u64)info->sw - 16;
  91         }
  92
  93         /* Interrupts aren't acceptable while we reboot */
  94         local_irq_disable();
  95
  96         /* Mask CMC and Performance Monitor interrupts */
  97         ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
  98         ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);
  99
 100         /* Mask ITV and Local Redirect Registers */
 101         ia64_set_itv(1 << 16);
 102         ia64_set_lrr0(1 << 16);
 103         ia64_set_lrr1(1 << 16);
 104
 105         /* terminate possible nested in-service interrupts */
 106         for (ii = 0; ii < 16; ii++)
 107                 ia64_eoi();
 108
 109         /* unmask TPR and clear any pending interrupts */
 110         ia64_setreg(_IA64_REG_CR_TPR, 0);
 111         ia64_srlz_d();
 112         while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR)
 113                 ia64_eoi();
 114         platform_kernel_launch_event();
 115         rnk = (relocate_new_kernel_t)&code_addr;
 116         (*rnk)(image->head, image->start, ia64_boot_param,
 117                      GRANULEROUNDDOWN((unsigned long) pal_addr));
 118         BUG();
 119 }
 120
 121 void machine_kexec(struct kimage *image)
 122 {
 123         BUG_ON(!image);
 124         unw_init_running(ia64_machine_kexec, image);
 125         for(;;);
 126 }
 127
 128 void arch_crash_save_vmcoreinfo(void)
 129 {
 130 #ifdef CONFIG_ARCH_DISCONTIGMEM_ENABLE
 131         VMCOREINFO_SYMBOL(pgdat_list);
 132         VMCOREINFO_LENGTH(pgdat_list, MAX_NUMNODES);
 133
 134         VMCOREINFO_SYMBOL(node_memblk);
 135         VMCOREINFO_LENGTH(node_memblk, NR_NODE_MEMBLKS);
 136         VMCOREINFO_SIZE(node_memblk_s);
 137         VMCOREINFO_OFFSET(node_memblk_s, start_paddr);
 138         VMCOREINFO_OFFSET(node_memblk_s, size);
 139 #endif
 140 #ifdef CONFIG_PGTABLE_3
 141         VMCOREINFO_CONFIG(PGTABLE_3);
 142 #elif  CONFIG_PGTABLE_4
 143         VMCOREINFO_CONFIG(PGTABLE_4);
 144 #endif
 145 }
 146
 147 unsigned long paddr_vmcoreinfo_note(void)
 148 {
 149         return ia64_tpa((unsigned long)(char *)&vmcoreinfo_note);
 150 }
 151