Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 into for-linus
[linux-2.6] / 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
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_DISCONTIGMEM) || defined(CONFIG_SPARSEMEM)
133         VMCOREINFO_SYMBOL(pgdat_list);
134         VMCOREINFO_LENGTH(pgdat_list, MAX_NUMNODES);
135 #endif
136 #ifdef CONFIG_NUMA
137         VMCOREINFO_SYMBOL(node_memblk);
138         VMCOREINFO_LENGTH(node_memblk, NR_NODE_MEMBLKS);
139         VMCOREINFO_STRUCT_SIZE(node_memblk_s);
140         VMCOREINFO_OFFSET(node_memblk_s, start_paddr);
141         VMCOREINFO_OFFSET(node_memblk_s, size);
142 #endif
143 #ifdef CONFIG_PGTABLE_3
144         VMCOREINFO_CONFIG(PGTABLE_3);
145 #elif  CONFIG_PGTABLE_4
146         VMCOREINFO_CONFIG(PGTABLE_4);
147 #endif
148 }
149
150 unsigned long paddr_vmcoreinfo_note(void)
151 {
152         return ia64_tpa((unsigned long)(char *)&vmcoreinfo_note);
153 }
154