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
  21 #include <asm/numa.h>
  22 #include <asm/mmu_context.h>
  23 #include <asm/setup.h>
  24 #include <asm/delay.h>
  25 #include <asm/meminit.h>
  26 #include <asm/processor.h>
  27 #include <asm/sal.h>
  28 #include <asm/mca.h>
  29
  30 typedef void (*relocate_new_kernel_t)(
  31                                         unsigned long indirection_page,
  32                                         unsigned long start_address,
  33                                         struct ia64_boot_param *boot_param,
  34                                         unsigned long pal_addr) __noreturn;
  35
  36 struct kimage *ia64_kimage;
  37
  38 struct resource efi_memmap_res = {
  39         .name  = "EFI Memory Map",
  40         .start = 0,
  41         .end   = 0,
  42         .flags = IORESOURCE_BUSY | IORESOURCE_MEM
  43 };
  44
  45 struct resource boot_param_res = {
  46         .name  = "Boot parameter",
  47         .start = 0,
  48         .end   = 0,
  49         .flags = IORESOURCE_BUSY | IORESOURCE_MEM
  50 };
  51
  52
  53 /*
  54  * Do what every setup is needed on image and the
  55  * reboot code buffer to allow us to avoid allocations
  56  * later.
  57  */
  58 int machine_kexec_prepare(struct kimage *image)
  59 {
  60         void *control_code_buffer;
  61         const unsigned long *func;
  62
  63         func = (unsigned long *)&relocate_new_kernel;
  64         /* Pre-load control code buffer to minimize work in kexec path */
  65         control_code_buffer = page_address(image->control_code_page);
  66         memcpy((void *)control_code_buffer, (const void *)func[0],
  67                         relocate_new_kernel_size);
  68         flush_icache_range((unsigned long)control_code_buffer,
  69                         (unsigned long)control_code_buffer + relocate_new_kernel_size);
  70         ia64_kimage = image;
  71
  72         return 0;
  73 }
  74
  75 void machine_kexec_cleanup(struct kimage *image)
  76 {
  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 static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
  84 {
  85         struct kimage *image = arg;
  86         relocate_new_kernel_t rnk;
  87         void *pal_addr = efi_get_pal_addr();
  88         unsigned long code_addr;
  89         int ii;
  90         u64 fp, gp;
  91         ia64_fptr_t *init_handler = (ia64_fptr_t *)ia64_os_init_on_kdump;
  92
  93         BUG_ON(!image);
  94         code_addr = (unsigned long)page_address(image->control_code_page);
  95         if (image->type == KEXEC_TYPE_CRASH) {
  96                 crash_save_this_cpu();
  97                 current->thread.ksp = (__u64)info->sw - 16;
  98
  99                 /* Register noop init handler */
 100                 fp = ia64_tpa(init_handler->fp);
 101                 gp = ia64_tpa(ia64_getreg(_IA64_REG_GP));
 102                 ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, fp, gp, 0, fp, gp, 0);
 103         } else {
 104                 /* Unregister init handlers of current kernel */
 105                 ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, 0, 0, 0, 0, 0, 0);
 106         }
 107
 108         /* Unregister mca handler - No more recovery on current kernel */
 109         ia64_sal_set_vectors(SAL_VECTOR_OS_MCA, 0, 0, 0, 0, 0, 0);
 110
 111         /* Interrupts aren't acceptable while we reboot */
 112         local_irq_disable();
 113
 114         /* Mask CMC and Performance Monitor interrupts */
 115         ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
 116         ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);
 117
 118         /* Mask ITV and Local Redirect Registers */
 119         ia64_set_itv(1 << 16);
 120         ia64_set_lrr0(1 << 16);
 121         ia64_set_lrr1(1 << 16);
 122
 123         /* terminate possible nested in-service interrupts */
 124         for (ii = 0; ii < 16; ii++)
 125                 ia64_eoi();
 126
 127         /* unmask TPR and clear any pending interrupts */
 128         ia64_setreg(_IA64_REG_CR_TPR, 0);
 129         ia64_srlz_d();
 130         while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR)
 131                 ia64_eoi();
 132         platform_kernel_launch_event();
 133         rnk = (relocate_new_kernel_t)&code_addr;
 134         (*rnk)(image->head, image->start, ia64_boot_param,
 135                      GRANULEROUNDDOWN((unsigned long) pal_addr));
 136         BUG();
 137 }
 138
 139 void machine_kexec(struct kimage *image)
 140 {
 141         BUG_ON(!image);
 142         unw_init_running(ia64_machine_kexec, image);
 143         for(;;);
 144 }
 145
 146 void arch_crash_save_vmcoreinfo(void)
 147 {
 148 #if defined(CONFIG_DISCONTIGMEM) || defined(CONFIG_SPARSEMEM)
 149         VMCOREINFO_SYMBOL(pgdat_list);
 150         VMCOREINFO_LENGTH(pgdat_list, MAX_NUMNODES);
 151 #endif
 152 #ifdef CONFIG_NUMA
 153         VMCOREINFO_SYMBOL(node_memblk);
 154         VMCOREINFO_LENGTH(node_memblk, NR_NODE_MEMBLKS);
 155         VMCOREINFO_STRUCT_SIZE(node_memblk_s);
 156         VMCOREINFO_OFFSET(node_memblk_s, start_paddr);
 157         VMCOREINFO_OFFSET(node_memblk_s, size);
 158 #endif
 159 #if CONFIG_PGTABLE_LEVELS == 3
 160         VMCOREINFO_CONFIG(PGTABLE_3);
 161 #elif CONFIG_PGTABLE_LEVELS == 4
 162         VMCOREINFO_CONFIG(PGTABLE_4);
 163 #endif
 164 }
 165
 166 unsigned long paddr_vmcoreinfo_note(void)
 167 {
 168         return ia64_tpa((unsigned long)(char *)&vmcoreinfo_note);
 169 }
 170