2 * arch/ia64/kernel/machine_kexec.c
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>
9 * This source code is licensed under the GNU General Public License,
10 * Version 2. See the file COPYING for more details.
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>
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;
28 struct kimage *ia64_kimage;
30 struct resource efi_memmap_res = {
31 .name = "EFI Memory Map",
34 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
37 struct resource boot_param_res = {
38 .name = "Boot parameter",
41 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
46 * Do what every setup is needed on image and the
47 * reboot code buffer to allow us to avoid allocations
50 int machine_kexec_prepare(struct kimage *image)
52 void *control_code_buffer;
53 const unsigned long *func;
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);
67 void machine_kexec_cleanup(struct kimage *image)
71 void machine_shutdown(void)
73 #ifdef CONFIG_HOTPLUG_CPU
76 for_each_online_cpu(cpu) {
77 if (cpu != smp_processor_id())
81 kexec_disable_iosapic();
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.
88 extern void *efi_get_pal_addr(void);
89 static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
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);
98 if (image->type == KEXEC_TYPE_CRASH) {
99 crash_save_this_cpu();
100 current->thread.ksp = (__u64)info->sw - 16;
103 /* Interrupts aren't acceptable while we reboot */
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);
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);
115 /* terminate possible nested in-service interrupts */
116 for (ii = 0; ii < 16; ii++)
119 /* unmask TPR and clear any pending interrupts */
120 ia64_setreg(_IA64_REG_CR_TPR, 0);
122 vector = ia64_get_ivr();
123 while (vector != IA64_SPURIOUS_INT_VECTOR) {
125 vector = ia64_get_ivr();
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));
134 void machine_kexec(struct kimage *image)
136 unw_init_running(ia64_machine_kexec, image);