This commit was manufactured by cvs2svn to create branch 'vserver'.
[linux-2.6.git] / 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 <asm/mmu_context.h>
18 #include <asm/setup.h>
19 #include <asm/delay.h>
20 #include <asm/meminit.h>
21
22 typedef NORET_TYPE void (*relocate_new_kernel_t)(
23                                         unsigned long indirection_page,
24                                         unsigned long start_address,
25                                         struct ia64_boot_param *boot_param,
26                                         unsigned long pal_addr) ATTRIB_NORET;
27
28 struct kimage *ia64_kimage;
29
30 struct resource efi_memmap_res = {
31         .name  = "EFI Memory Map",
32         .start = 0,
33         .end   = 0,
34         .flags = IORESOURCE_BUSY | IORESOURCE_MEM
35 };
36
37 struct resource boot_param_res = {
38         .name  = "Boot parameter",
39         .start = 0,
40         .end   = 0,
41         .flags = IORESOURCE_BUSY | IORESOURCE_MEM
42 };
43
44
45 /*
46  * Do what every setup is needed on image and the
47  * reboot code buffer to allow us to avoid allocations
48  * later.
49  */
50 int machine_kexec_prepare(struct kimage *image)
51 {
52         void *control_code_buffer;
53         const unsigned long *func;
54
55         func = (unsigned long *)&relocate_new_kernel;
56         /* Pre-load control code buffer to minimize work in kexec path */
57         control_code_buffer = page_address(image->control_code_page);
58         memcpy((void *)control_code_buffer, (const void *)func[0],
59                         relocate_new_kernel_size);
60         flush_icache_range((unsigned long)control_code_buffer,
61                         (unsigned long)control_code_buffer + relocate_new_kernel_size);
62         ia64_kimage = image;
63
64         return 0;
65 }
66
67 void machine_kexec_cleanup(struct kimage *image)
68 {
69 }
70
71 void machine_shutdown(void)
72 {
73 #ifdef CONFIG_HOTPLUG_CPU
74         int cpu;
75
76         for_each_online_cpu(cpu) {
77                 if (cpu != smp_processor_id())
78                         cpu_down(cpu);
79         }
80 #endif
81         kexec_disable_iosapic();
82 }
83
84 /*
85  * Do not allocate memory (or fail in any way) in machine_kexec().
86  * We are past the point of no return, committed to rebooting now.
87  */
88 extern void *efi_get_pal_addr(void);
89 static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
90 {
91         struct kimage *image = arg;
92         relocate_new_kernel_t rnk;
93         void *pal_addr = efi_get_pal_addr();
94         unsigned long code_addr = (unsigned long)page_address(image->control_code_page);
95         unsigned long vector;
96         int ii;
97
98         if (image->type == KEXEC_TYPE_CRASH) {
99                 crash_save_this_cpu();
100                 current->thread.ksp = (__u64)info->sw - 16;
101         }
102
103         /* Interrupts aren't acceptable while we reboot */
104         local_irq_disable();
105
106         /* Mask CMC and Performance Monitor interrupts */
107         ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
108         ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);
109
110         /* Mask ITV and Local Redirect Registers */
111         ia64_set_itv(1 << 16);
112         ia64_set_lrr0(1 << 16);
113         ia64_set_lrr1(1 << 16);
114
115         /* terminate possible nested in-service interrupts */
116         for (ii = 0; ii < 16; ii++)
117                 ia64_eoi();
118
119         /* unmask TPR and clear any pending interrupts */
120         ia64_setreg(_IA64_REG_CR_TPR, 0);
121         ia64_srlz_d();
122         vector = ia64_get_ivr();
123         while (vector != IA64_SPURIOUS_INT_VECTOR) {
124                 ia64_eoi();
125                 vector = ia64_get_ivr();
126         }
127         platform_kernel_launch_event();
128         rnk = (relocate_new_kernel_t)&code_addr;
129         (*rnk)(image->head, image->start, ia64_boot_param,
130                      GRANULEROUNDDOWN((unsigned long) pal_addr));
131         BUG();
132 }
133
134 void machine_kexec(struct kimage *image)
135 {
136         unw_init_running(ia64_machine_kexec, image);
137         for(;;);
138 }