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Linux/arch/ia64/kernel/machine_kexec.c

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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 
 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 

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