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
30typedef 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) __noreturn;
35
36struct kimage *ia64_kimage;
37
38struct resource efi_memmap_res = {
39        .name  = "EFI Memory Map",
40        .start = 0,
41        .end   = 0,
42        .flags = IORESOURCE_BUSY | IORESOURCE_MEM
43};
44
45struct 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 */
58int 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
75void 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 */
83static 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;
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	code_addr = (unsigned long)page_address(image->control_code_page);
95	if (image->type == KEXEC_TYPE_CRASH) {
96		crash_save_this_cpu();
97		current->thread.ksp = (__u64)info->sw - 16;
98
99		/* Register noop init handler */
100		fp = ia64_tpa(init_handler->fp);
101		gp = ia64_tpa(ia64_getreg(_IA64_REG_GP));
102		ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, fp, gp, 0, fp, gp, 0);
103	} else {
104		/* Unregister init handlers of current kernel */
105		ia64_sal_set_vectors(SAL_VECTOR_OS_INIT, 0, 0, 0, 0, 0, 0);
106	}
107
108	/* Unregister mca handler - No more recovery on current kernel */
109	ia64_sal_set_vectors(SAL_VECTOR_OS_MCA, 0, 0, 0, 0, 0, 0);
110
111	/* Interrupts aren't acceptable while we reboot */
112	local_irq_disable();
113
114	/* Mask CMC and Performance Monitor interrupts */
115	ia64_setreg(_IA64_REG_CR_PMV, 1 << 16);
116	ia64_setreg(_IA64_REG_CR_CMCV, 1 << 16);
117
118	/* Mask ITV and Local Redirect Registers */
119	ia64_set_itv(1 << 16);
120	ia64_set_lrr0(1 << 16);
121	ia64_set_lrr1(1 << 16);
122
123	/* terminate possible nested in-service interrupts */
124	for (ii = 0; ii < 16; ii++)
125		ia64_eoi();
126
127	/* unmask TPR and clear any pending interrupts */
128	ia64_setreg(_IA64_REG_CR_TPR, 0);
129	ia64_srlz_d();
130	while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR)
131		ia64_eoi();
132	platform_kernel_launch_event();
133	rnk = (relocate_new_kernel_t)&code_addr;
134	(*rnk)(image->head, image->start, ia64_boot_param,
135		     GRANULEROUNDDOWN((unsigned long) pal_addr));
136	BUG();
137}
138
139void machine_kexec(struct kimage *image)
140{
141	BUG_ON(!image);
142	unw_init_running(ia64_machine_kexec, image);
143	for(;;);
144}
145
146void arch_crash_save_vmcoreinfo(void)
147{
148#if defined(CONFIG_DISCONTIGMEM) || defined(CONFIG_SPARSEMEM)
149	VMCOREINFO_SYMBOL(pgdat_list);
150	VMCOREINFO_LENGTH(pgdat_list, MAX_NUMNODES);
151#endif
152#ifdef CONFIG_NUMA
153	VMCOREINFO_SYMBOL(node_memblk);
154	VMCOREINFO_LENGTH(node_memblk, NR_NODE_MEMBLKS);
155	VMCOREINFO_STRUCT_SIZE(node_memblk_s);
156	VMCOREINFO_OFFSET(node_memblk_s, start_paddr);
157	VMCOREINFO_OFFSET(node_memblk_s, size);
158#endif
159#if CONFIG_PGTABLE_LEVELS == 3
160	VMCOREINFO_CONFIG(PGTABLE_3);
161#elif CONFIG_PGTABLE_LEVELS == 4
162	VMCOREINFO_CONFIG(PGTABLE_4);
163#endif
164}
165
166unsigned long paddr_vmcoreinfo_note(void)
167{
168	return ia64_tpa((unsigned long)(char *)&vmcoreinfo_note);
169}
170
171