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 28 typedef NORET_TYPE void (*relocate_new_kernel_t)( 29 unsigned long indirection_page, 30 unsigned long start_address, 31 struct ia64_boot_param *boot_param, 32 unsigned long pal_addr) ATTRIB_NORET; 33 34 struct kimage *ia64_kimage; 35 36 struct resource efi_memmap_res = { 37 .name = "EFI Memory Map", 38 .start = 0, 39 .end = 0, 40 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 41 }; 42 43 struct resource boot_param_res = { 44 .name = "Boot parameter", 45 .start = 0, 46 .end = 0, 47 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 48 }; 49 50 51 /* 52 * Do what every setup is needed on image and the 53 * reboot code buffer to allow us to avoid allocations 54 * later. 55 */ 56 int machine_kexec_prepare(struct kimage *image) 57 { 58 void *control_code_buffer; 59 const unsigned long *func; 60 61 func = (unsigned long *)&relocate_new_kernel; 62 /* Pre-load control code buffer to minimize work in kexec path */ 63 control_code_buffer = page_address(image->control_code_page); 64 memcpy((void *)control_code_buffer, (const void *)func[0], 65 relocate_new_kernel_size); 66 flush_icache_range((unsigned long)control_code_buffer, 67 (unsigned long)control_code_buffer + relocate_new_kernel_size); 68 ia64_kimage = image; 69 70 return 0; 71 } 72 73 void machine_kexec_cleanup(struct kimage *image) 74 { 75 } 76 77 /* 78 * Do not allocate memory (or fail in any way) in machine_kexec(). 79 * We are past the point of no return, committed to rebooting now. 80 */ 81 static void ia64_machine_kexec(struct unw_frame_info *info, void *arg) 82 { 83 struct kimage *image = arg; 84 relocate_new_kernel_t rnk; 85 void *pal_addr = efi_get_pal_addr(); 86 unsigned long code_addr = (unsigned long)page_address(image->control_code_page); 87 int ii; 88 89 BUG_ON(!image); 90 if (image->type == KEXEC_TYPE_CRASH) { 91 crash_save_this_cpu(); 92 current->thread.ksp = (__u64)info->sw - 16; 93 } 94 95 /* Interrupts aren't acceptable while we reboot */ 96 local_irq_disable(); 97 98 /* Mask CMC and Performance Monitor interrupts */ 99 ia64_setreg(_IA64_REG_CR_PMV, 1 << 16); 100 ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16); 101 102 /* Mask ITV and Local Redirect Registers */ 103 ia64_set_itv(1 << 16); 104 ia64_set_lrr0(1 << 16); 105 ia64_set_lrr1(1 << 16); 106 107 /* terminate possible nested in-service interrupts */ 108 for (ii = 0; ii < 16; ii++) 109 ia64_eoi(); 110 111 /* unmask TPR and clear any pending interrupts */ 112 ia64_setreg(_IA64_REG_CR_TPR, 0); 113 ia64_srlz_d(); 114 while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR) 115 ia64_eoi(); 116 platform_kernel_launch_event(); 117 rnk = (relocate_new_kernel_t)&code_addr; 118 (*rnk)(image->head, image->start, ia64_boot_param, 119 GRANULEROUNDDOWN((unsigned long) pal_addr)); 120 BUG(); 121 } 122 123 void machine_kexec(struct kimage *image) 124 { 125 BUG_ON(!image); 126 unw_init_running(ia64_machine_kexec, image); 127 for(;;); 128 } 129 130 void arch_crash_save_vmcoreinfo(void) 131 { 132 #if defined(CONFIG_ARCH_DISCONTIGMEM_ENABLE) && defined(CONFIG_NUMA) 133 VMCOREINFO_SYMBOL(pgdat_list); 134 VMCOREINFO_LENGTH(pgdat_list, MAX_NUMNODES); 135 136 VMCOREINFO_SYMBOL(node_memblk); 137 VMCOREINFO_LENGTH(node_memblk, NR_NODE_MEMBLKS); 138 VMCOREINFO_SIZE(node_memblk_s); 139 VMCOREINFO_OFFSET(node_memblk_s, start_paddr); 140 VMCOREINFO_OFFSET(node_memblk_s, size); 141 #endif 142 #ifdef CONFIG_PGTABLE_3 143 VMCOREINFO_CONFIG(PGTABLE_3); 144 #elif CONFIG_PGTABLE_4 145 VMCOREINFO_CONFIG(PGTABLE_4); 146 #endif 147 } 148 149 unsigned long paddr_vmcoreinfo_note(void) 150 { 151 return ia64_tpa((unsigned long)(char *)&vmcoreinfo_note); 152 } 153 154