xref: /openbmc/linux/arch/ia64/kernel/machine_kexec.c (revision b6dcefde)
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 NORET_TYPE 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) ATTRIB_NORET;
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 = (unsigned long)page_address(image->control_code_page);
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 	if (image->type == KEXEC_TYPE_CRASH) {
95 		crash_save_this_cpu();
96 		current->thread.ksp = (__u64)info->sw - 16;
97 
98 		/* Register noop init handler */
99 		fp = ia64_tpa(init_handler->fp);
100 		gp = ia64_tpa(ia64_getreg(_IA64_REG_GP));
101 		ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, fp, gp, 0, fp, gp, 0);
102 	} else {
103 		/* Unregister init handlers of current kernel */
104 		ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, 0, 0, 0, 0, 0, 0);
105 	}
106 
107 	/* Unregister mca handler - No more recovery on current kernel */
108 	ia64_sal_set_vectors(SAL_VECTOR_OS_MCA, 0, 0, 0, 0, 0, 0);
109 
110 	/* Interrupts aren't acceptable while we reboot */
111 	local_irq_disable();
112 
113 	/* Mask CMC and Performance Monitor interrupts */
114 	ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
115 	ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);
116 
117 	/* Mask ITV and Local Redirect Registers */
118 	ia64_set_itv(1 << 16);
119 	ia64_set_lrr0(1 << 16);
120 	ia64_set_lrr1(1 << 16);
121 
122 	/* terminate possible nested in-service interrupts */
123 	for (ii = 0; ii < 16; ii++)
124 		ia64_eoi();
125 
126 	/* unmask TPR and clear any pending interrupts */
127 	ia64_setreg(_IA64_REG_CR_TPR, 0);
128 	ia64_srlz_d();
129 	while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR)
130 		ia64_eoi();
131 	platform_kernel_launch_event();
132 	rnk = (relocate_new_kernel_t)&code_addr;
133 	(*rnk)(image->head, image->start, ia64_boot_param,
134 		     GRANULEROUNDDOWN((unsigned long) pal_addr));
135 	BUG();
136 }
137 
138 void machine_kexec(struct kimage *image)
139 {
140 	BUG_ON(!image);
141 	unw_init_running(ia64_machine_kexec, image);
142 	for(;;);
143 }
144 
145 void arch_crash_save_vmcoreinfo(void)
146 {
147 #if defined(CONFIG_DISCONTIGMEM) || defined(CONFIG_SPARSEMEM)
148 	VMCOREINFO_SYMBOL(pgdat_list);
149 	VMCOREINFO_LENGTH(pgdat_list, MAX_NUMNODES);
150 #endif
151 #ifdef CONFIG_NUMA
152 	VMCOREINFO_SYMBOL(node_memblk);
153 	VMCOREINFO_LENGTH(node_memblk, NR_NODE_MEMBLKS);
154 	VMCOREINFO_STRUCT_SIZE(node_memblk_s);
155 	VMCOREINFO_OFFSET(node_memblk_s, start_paddr);
156 	VMCOREINFO_OFFSET(node_memblk_s, size);
157 #endif
158 #ifdef CONFIG_PGTABLE_3
159 	VMCOREINFO_CONFIG(PGTABLE_3);
160 #elif  CONFIG_PGTABLE_4
161 	VMCOREINFO_CONFIG(PGTABLE_4);
162 #endif
163 }
164 
165 unsigned long paddr_vmcoreinfo_note(void)
166 {
167 	return ia64_tpa((unsigned long)(char *)&vmcoreinfo_note);
168 }
169 
170