1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * arch/ia64/kernel/machine_kexec.c 4 * 5 * Handle transition of Linux booting another kernel 6 * Copyright (C) 2005 Hewlett-Packard Development Comapny, L.P. 7 * Copyright (C) 2005 Khalid Aziz <khalid.aziz@hp.com> 8 * Copyright (C) 2006 Intel Corp, Zou Nan hai <nanhai.zou@intel.com> 9 */ 10 11 #include <linux/mm.h> 12 #include <linux/kexec.h> 13 #include <linux/cpu.h> 14 #include <linux/irq.h> 15 #include <linux/efi.h> 16 #include <linux/numa.h> 17 #include <linux/mmzone.h> 18 19 #include <asm/efi.h> 20 #include <asm/numa.h> 21 #include <asm/mmu_context.h> 22 #include <asm/setup.h> 23 #include <asm/delay.h> 24 #include <asm/meminit.h> 25 #include <asm/processor.h> 26 #include <asm/sal.h> 27 #include <asm/mca.h> 28 29 typedef void (*relocate_new_kernel_t)( 30 unsigned long indirection_page, 31 unsigned long start_address, 32 struct ia64_boot_param *boot_param, 33 unsigned long pal_addr) __noreturn; 34 35 struct kimage *ia64_kimage; 36 37 struct resource efi_memmap_res = { 38 .name = "EFI Memory Map", 39 .start = 0, 40 .end = 0, 41 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 42 }; 43 44 struct resource boot_param_res = { 45 .name = "Boot parameter", 46 .start = 0, 47 .end = 0, 48 .flags = IORESOURCE_BUSY | IORESOURCE_MEM 49 }; 50 51 52 /* 53 * Do what every setup is needed on image and the 54 * reboot code buffer to allow us to avoid allocations 55 * later. 56 */ 57 int machine_kexec_prepare(struct kimage *image) 58 { 59 void *control_code_buffer; 60 const unsigned long *func; 61 62 func = (unsigned long *)&relocate_new_kernel; 63 /* Pre-load control code buffer to minimize work in kexec path */ 64 control_code_buffer = page_address(image->control_code_page); 65 memcpy((void *)control_code_buffer, (const void *)func[0], 66 relocate_new_kernel_size); 67 flush_icache_range((unsigned long)control_code_buffer, 68 (unsigned long)control_code_buffer + relocate_new_kernel_size); 69 ia64_kimage = image; 70 71 return 0; 72 } 73 74 void machine_kexec_cleanup(struct kimage *image) 75 { 76 } 77 78 /* 79 * Do not allocate memory (or fail in any way) in machine_kexec(). 80 * We are past the point of no return, committed to rebooting now. 81 */ 82 static void ia64_machine_kexec(struct unw_frame_info *info, void *arg) 83 { 84 struct kimage *image = arg; 85 relocate_new_kernel_t rnk; 86 void *pal_addr = efi_get_pal_addr(); 87 unsigned long code_addr; 88 int ii; 89 u64 fp, gp; 90 ia64_fptr_t *init_handler = (ia64_fptr_t *)ia64_os_init_on_kdump; 91 92 BUG_ON(!image); 93 code_addr = (unsigned long)page_address(image->control_code_page); 94 if (image->type == KEXEC_TYPE_CRASH) { 95 crash_save_this_cpu(); 96 current->thread.ksp = (__u64)info->sw - 16; 97 98 /* Register noop init handler */ 99 fp = ia64_tpa(init_handler->fp); 100 gp = ia64_tpa(ia64_getreg(_IA64_REG_GP)); 101 ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, fp, gp, 0, fp, gp, 0); 102 } else { 103 /* Unregister init handlers of current kernel */ 104 ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, 0, 0, 0, 0, 0, 0); 105 } 106 107 /* Unregister mca handler - No more recovery on current kernel */ 108 ia64_sal_set_vectors(SAL_VECTOR_OS_MCA, 0, 0, 0, 0, 0, 0); 109 110 /* Interrupts aren't acceptable while we reboot */ 111 local_irq_disable(); 112 113 /* Mask CMC and Performance Monitor interrupts */ 114 ia64_setreg(_IA64_REG_CR_PMV, 1 << 16); 115 ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16); 116 117 /* Mask ITV and Local Redirect Registers */ 118 ia64_set_itv(1 << 16); 119 ia64_set_lrr0(1 << 16); 120 ia64_set_lrr1(1 << 16); 121 122 /* terminate possible nested in-service interrupts */ 123 for (ii = 0; ii < 16; ii++) 124 ia64_eoi(); 125 126 /* unmask TPR and clear any pending interrupts */ 127 ia64_setreg(_IA64_REG_CR_TPR, 0); 128 ia64_srlz_d(); 129 while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR) 130 ia64_eoi(); 131 rnk = (relocate_new_kernel_t)&code_addr; 132 (*rnk)(image->head, image->start, ia64_boot_param, 133 GRANULEROUNDDOWN((unsigned long) pal_addr)); 134 BUG(); 135 } 136 137 void machine_kexec(struct kimage *image) 138 { 139 BUG_ON(!image); 140 unw_init_running(ia64_machine_kexec, image); 141 for(;;); 142 } 143 144 void arch_crash_save_vmcoreinfo(void) 145 { 146 #if defined(CONFIG_DISCONTIGMEM) || defined(CONFIG_SPARSEMEM) 147 VMCOREINFO_SYMBOL(pgdat_list); 148 VMCOREINFO_LENGTH(pgdat_list, MAX_NUMNODES); 149 #endif 150 #ifdef CONFIG_NUMA 151 VMCOREINFO_SYMBOL(node_memblk); 152 VMCOREINFO_LENGTH(node_memblk, NR_NODE_MEMBLKS); 153 VMCOREINFO_STRUCT_SIZE(node_memblk_s); 154 VMCOREINFO_OFFSET(node_memblk_s, start_paddr); 155 VMCOREINFO_OFFSET(node_memblk_s, size); 156 #endif 157 #if CONFIG_PGTABLE_LEVELS == 3 158 VMCOREINFO_CONFIG(PGTABLE_3); 159 #elif CONFIG_PGTABLE_LEVELS == 4 160 VMCOREINFO_CONFIG(PGTABLE_4); 161 #endif 162 } 163 164