summaryrefslogtreecommitdiff
path: root/arch/ia64/kernel/machine_kexec.c
blob: efc9b568401c898047170f6f3875e55f6bca489b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
// SPDX-License-Identifier: GPL-2.0-only
/*
 * arch/ia64/kernel/machine_kexec.c
 *
 * Handle transition of Linux booting another kernel
 * Copyright (C) 2005 Hewlett-Packard Development Comapny, L.P.
 * Copyright (C) 2005 Khalid Aziz <khalid.aziz@hp.com>
 * Copyright (C) 2006 Intel Corp, Zou Nan hai <nanhai.zou@intel.com>
 */

#include <linux/mm.h>
#include <linux/kexec.h>
#include <linux/cpu.h>
#include <linux/irq.h>
#include <linux/efi.h>
#include <linux/numa.h>
#include <linux/mmzone.h>

#include <asm/numa.h>
#include <asm/mmu_context.h>
#include <asm/setup.h>
#include <asm/delay.h>
#include <asm/meminit.h>
#include <asm/processor.h>
#include <asm/sal.h>
#include <asm/mca.h>

typedef void (*relocate_new_kernel_t)(
					unsigned long indirection_page,
					unsigned long start_address,
					struct ia64_boot_param *boot_param,
					unsigned long pal_addr) __noreturn;

struct kimage *ia64_kimage;

struct resource efi_memmap_res = {
        .name  = "EFI Memory Map",
        .start = 0,
        .end   = 0,
        .flags = IORESOURCE_BUSY | IORESOURCE_MEM
};

struct resource boot_param_res = {
        .name  = "Boot parameter",
        .start = 0,
        .end   = 0,
        .flags = IORESOURCE_BUSY | IORESOURCE_MEM
};


/*
 * Do what every setup is needed on image and the
 * reboot code buffer to allow us to avoid allocations
 * later.
 */
int machine_kexec_prepare(struct kimage *image)
{
	void *control_code_buffer;
	const unsigned long *func;

	func = (unsigned long *)&relocate_new_kernel;
	/* Pre-load control code buffer to minimize work in kexec path */
	control_code_buffer = page_address(image->control_code_page);
	memcpy((void *)control_code_buffer, (const void *)func[0],
			relocate_new_kernel_size);
	flush_icache_range((unsigned long)control_code_buffer,
			(unsigned long)control_code_buffer + relocate_new_kernel_size);
	ia64_kimage = image;

	return 0;
}

void machine_kexec_cleanup(struct kimage *image)
{
}

/*
 * Do not allocate memory (or fail in any way) in machine_kexec().
 * We are past the point of no return, committed to rebooting now.
 */
static void ia64_machine_kexec(struct unw_frame_info *info, void *arg)
{
	struct kimage *image = arg;
	relocate_new_kernel_t rnk;
	void *pal_addr = efi_get_pal_addr();
	unsigned long code_addr;
	int ii;
	u64 fp, gp;
	ia64_fptr_t *init_handler = (ia64_fptr_t *)ia64_os_init_on_kdump;

	BUG_ON(!image);
	code_addr = (unsigned long)page_address(image->control_code_page);
	if (image->type == KEXEC_TYPE_CRASH) {
		crash_save_this_cpu();
		current->thread.ksp = (__u64)info->sw - 16;

		/* Register noop init handler */
		fp = ia64_tpa(init_handler->fp);
		gp = ia64_tpa(ia64_getreg(_IA64_REG_GP));
		ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, fp, gp, 0, fp, gp, 0);
	} else {
		/* Unregister init handlers of current kernel */
		ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, 0, 0, 0, 0, 0, 0);
	}

	/* Unregister mca handler - No more recovery on current kernel */
	ia64_sal_set_vectors(SAL_VECTOR_OS_MCA, 0, 0, 0, 0, 0, 0);

	/* Interrupts aren't acceptable while we reboot */
	local_irq_disable();

	/* Mask CMC and Performance Monitor interrupts */
	ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
	ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);

	/* Mask ITV and Local Redirect Registers */
	ia64_set_itv(1 << 16);
	ia64_set_lrr0(1 << 16);
	ia64_set_lrr1(1 << 16);

	/* terminate possible nested in-service interrupts */
	for (ii = 0; ii < 16; ii++)
		ia64_eoi();

	/* unmask TPR and clear any pending interrupts */
	ia64_setreg(_IA64_REG_CR_TPR, 0);
	ia64_srlz_d();
	while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR)
		ia64_eoi();
	rnk = (relocate_new_kernel_t)&code_addr;
	(*rnk)(image->head, image->start, ia64_boot_param,
		     GRANULEROUNDDOWN((unsigned long) pal_addr));
	BUG();
}

void machine_kexec(struct kimage *image)
{
	BUG_ON(!image);
	unw_init_running(ia64_machine_kexec, image);
	for(;;);
}

void arch_crash_save_vmcoreinfo(void)
{
#if defined(CONFIG_DISCONTIGMEM) || defined(CONFIG_SPARSEMEM)
	VMCOREINFO_SYMBOL(pgdat_list);
	VMCOREINFO_LENGTH(pgdat_list, MAX_NUMNODES);
#endif
#ifdef CONFIG_NUMA
	VMCOREINFO_SYMBOL(node_memblk);
	VMCOREINFO_LENGTH(node_memblk, NR_NODE_MEMBLKS);
	VMCOREINFO_STRUCT_SIZE(node_memblk_s);
	VMCOREINFO_OFFSET(node_memblk_s, start_paddr);
	VMCOREINFO_OFFSET(node_memblk_s, size);
#endif
#if CONFIG_PGTABLE_LEVELS == 3
	VMCOREINFO_CONFIG(PGTABLE_3);
#elif CONFIG_PGTABLE_LEVELS == 4
	VMCOREINFO_CONFIG(PGTABLE_4);
#endif
}