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 <linux/efi.h>
18 #include <asm/mmu_context.h>
19 #include <asm/setup.h>
20 #include <asm/delay.h>
21 #include <asm/meminit.h>
23 typedef NORET_TYPE void (*relocate_new_kernel_t)(
24 unsigned long indirection_page,
25 unsigned long start_address,
26 struct ia64_boot_param *boot_param,
27 unsigned long pal_addr) ATTRIB_NORET;
29 struct kimage *ia64_kimage;
31 struct resource efi_memmap_res = {
32 .name = "EFI Memory Map",
35 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
38 struct resource boot_param_res = {
39 .name = "Boot parameter",
42 .flags = IORESOURCE_BUSY | IORESOURCE_MEM
47 * Do what every setup is needed on image and the
48 * reboot code buffer to allow us to avoid allocations
51 int machine_kexec_prepare(struct kimage *image)
53 void *control_code_buffer;
54 const unsigned long *func;
56 func = (unsigned long *)&relocate_new_kernel;
57 /* Pre-load control code buffer to minimize work in kexec path */
58 control_code_buffer = page_address(image->control_code_page);
59 memcpy((void *)control_code_buffer, (const void *)func[0],
60 relocate_new_kernel_size);
61 flush_icache_range((unsigned long)control_code_buffer,
62 (unsigned long)control_code_buffer + relocate_new_kernel_size);
68 void machine_kexec_cleanup(struct kimage *image)
73 * Do not allocate memory (or fail in any way) in machine_kexec().
74 * We are past the point of no return, committed to rebooting now.
76 static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
78 struct kimage *image = arg;
79 relocate_new_kernel_t rnk;
80 void *pal_addr = efi_get_pal_addr();
81 unsigned long code_addr = (unsigned long)page_address(image->control_code_page);
86 if (image->type == KEXEC_TYPE_CRASH) {
87 crash_save_this_cpu();
88 current->thread.ksp = (__u64)info->sw - 16;
91 /* Interrupts aren't acceptable while we reboot */
94 /* Mask CMC and Performance Monitor interrupts */
95 ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
96 ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);
98 /* Mask ITV and Local Redirect Registers */
99 ia64_set_itv(1 << 16);
100 ia64_set_lrr0(1 << 16);
101 ia64_set_lrr1(1 << 16);
103 /* terminate possible nested in-service interrupts */
104 for (ii = 0; ii < 16; ii++)
107 /* unmask TPR and clear any pending interrupts */
108 ia64_setreg(_IA64_REG_CR_TPR, 0);
110 vector = ia64_get_ivr();
111 while (vector != IA64_SPURIOUS_INT_VECTOR) {
113 vector = ia64_get_ivr();
115 platform_kernel_launch_event();
116 rnk = (relocate_new_kernel_t)&code_addr;
117 (*rnk)(image->head, image->start, ia64_boot_param,
118 GRANULEROUNDDOWN((unsigned long) pal_addr));
122 void machine_kexec(struct kimage *image)
125 unw_init_running(ia64_machine_kexec, image);