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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_POWERPC_KEXEC_H
3#define _ASM_POWERPC_KEXEC_H
4#ifdef __KERNEL__
5
6#if defined(CONFIG_PPC_85xx) || defined(CONFIG_44x)
7
8/*
9 * On FSL-BookE we setup a 1:1 mapping which covers the first 2GiB of memory
10 * and therefore we can only deal with memory within this range
11 */
12#define KEXEC_SOURCE_MEMORY_LIMIT (2 * 1024 * 1024 * 1024UL - 1)
13#define KEXEC_DESTINATION_MEMORY_LIMIT (2 * 1024 * 1024 * 1024UL - 1)
14#define KEXEC_CONTROL_MEMORY_LIMIT (2 * 1024 * 1024 * 1024UL - 1)
15
16#else
17
18/*
19 * Maximum page that is mapped directly into kernel memory.
20 * XXX: Since we copy virt we can use any page we allocate
21 */
22#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
23
24/*
25 * Maximum address we can reach in physical address mode.
26 * XXX: I want to allow initrd in highmem. Otherwise set to rmo on LPAR.
27 */
28#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
29
30/* Maximum address we can use for the control code buffer */
31#ifdef __powerpc64__
32#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
33#else
34/* TASK_SIZE, probably left over from use_mm ?? */
35#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
36#endif
37#endif
38
39#define KEXEC_CONTROL_PAGE_SIZE 4096
40
41/* The native architecture */
42#ifdef __powerpc64__
43#define KEXEC_ARCH KEXEC_ARCH_PPC64
44#else
45#define KEXEC_ARCH KEXEC_ARCH_PPC
46#endif
47
48#define KEXEC_STATE_NONE 0
49#define KEXEC_STATE_IRQS_OFF 1
50#define KEXEC_STATE_REAL_MODE 2
51
52#ifndef __ASSEMBLER__
53#include <asm/reg.h>
54
55typedef void (*crash_shutdown_t)(void);
56
57#ifdef CONFIG_KEXEC_CORE
58struct kimage;
59struct pt_regs;
60
61extern void kexec_smp_wait(void); /* get and clear naca physid, wait for
62 master to copy new code to 0 */
63extern void default_machine_kexec(struct kimage *image);
64
65void relocate_new_kernel(unsigned long indirection_page, unsigned long reboot_code_buffer,
66 unsigned long start_address) __noreturn;
67void kexec_copy_flush(struct kimage *image);
68
69#ifdef CONFIG_KEXEC_FILE
70extern const struct kexec_file_ops kexec_elf64_ops;
71
72#define ARCH_HAS_KIMAGE_ARCH
73
74struct kimage_arch {
75 struct crash_mem *exclude_ranges;
76
77 unsigned long backup_start;
78 void *backup_buf;
79 void *fdt;
80};
81
82char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
83 unsigned long cmdline_len);
84int setup_purgatory(struct kimage *image, const void *slave_code,
85 const void *fdt, unsigned long kernel_load_addr,
86 unsigned long fdt_load_addr);
87
88#ifdef CONFIG_PPC64
89struct kexec_buf;
90
91int arch_kexec_kernel_image_probe(struct kimage *image, void *buf, unsigned long buf_len);
92#define arch_kexec_kernel_image_probe arch_kexec_kernel_image_probe
93
94int arch_kimage_file_post_load_cleanup(struct kimage *image);
95#define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
96
97int arch_check_excluded_range(struct kimage *image, unsigned long start,
98 unsigned long end);
99#define arch_check_excluded_range arch_check_excluded_range
100
101
102int load_crashdump_segments_ppc64(struct kimage *image,
103 struct kexec_buf *kbuf);
104int setup_purgatory_ppc64(struct kimage *image, const void *slave_code,
105 const void *fdt, unsigned long kernel_load_addr,
106 unsigned long fdt_load_addr);
107unsigned int kexec_extra_fdt_size_ppc64(struct kimage *image, struct crash_mem *rmem);
108int setup_new_fdt_ppc64(const struct kimage *image, void *fdt, struct crash_mem *rmem);
109#endif /* CONFIG_PPC64 */
110
111#endif /* CONFIG_KEXEC_FILE */
112
113#endif /* CONFIG_KEXEC_CORE */
114
115#ifdef CONFIG_CRASH_RESERVE
116int __init overlaps_crashkernel(unsigned long start, unsigned long size);
117extern void arch_reserve_crashkernel(void);
118extern void kdump_cma_reserve(void);
119#else
120static inline void arch_reserve_crashkernel(void) {}
121static inline int overlaps_crashkernel(unsigned long start, unsigned long size) { return 0; }
122static inline void kdump_cma_reserve(void) { }
123#endif
124
125#if defined(CONFIG_CRASH_DUMP)
126/*
127 * This function is responsible for capturing register states if coming
128 * via panic or invoking dump using sysrq-trigger.
129 */
130static inline void crash_setup_regs(struct pt_regs *newregs,
131 struct pt_regs *oldregs)
132{
133 if (oldregs)
134 memcpy(newregs, oldregs, sizeof(*newregs));
135 else
136 ppc_save_regs(newregs);
137}
138
139#ifdef CONFIG_CRASH_HOTPLUG
140void arch_crash_handle_hotplug_event(struct kimage *image, void *arg);
141#define arch_crash_handle_hotplug_event arch_crash_handle_hotplug_event
142
143int arch_crash_hotplug_support(struct kimage *image, unsigned long kexec_flags);
144#define arch_crash_hotplug_support arch_crash_hotplug_support
145
146unsigned int arch_crash_get_elfcorehdr_size(void);
147#define crash_get_elfcorehdr_size arch_crash_get_elfcorehdr_size
148#endif /* CONFIG_CRASH_HOTPLUG */
149
150extern int crashing_cpu;
151extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
152extern void crash_ipi_callback(struct pt_regs *regs);
153extern int crash_wake_offline;
154
155extern int crash_shutdown_register(crash_shutdown_t handler);
156extern int crash_shutdown_unregister(crash_shutdown_t handler);
157extern void default_machine_crash_shutdown(struct pt_regs *regs);
158
159extern void crash_kexec_prepare(void);
160extern void crash_kexec_secondary(struct pt_regs *regs);
161
162static inline bool kdump_in_progress(void)
163{
164 return crashing_cpu >= 0;
165}
166
167bool is_kdump_kernel(void);
168#define is_kdump_kernel is_kdump_kernel
169#if defined(CONFIG_PPC_RTAS)
170void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
171#define crash_free_reserved_phys_range crash_free_reserved_phys_range
172#endif /* CONFIG_PPC_RTAS */
173
174#else /* !CONFIG_CRASH_DUMP */
175static inline void crash_kexec_secondary(struct pt_regs *regs) { }
176
177static inline int crash_shutdown_register(crash_shutdown_t handler)
178{
179 return 0;
180}
181
182static inline int crash_shutdown_unregister(crash_shutdown_t handler)
183{
184 return 0;
185}
186
187static inline bool kdump_in_progress(void)
188{
189 return false;
190}
191
192static inline void crash_ipi_callback(struct pt_regs *regs) { }
193
194static inline void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
195{
196}
197
198#endif /* CONFIG_CRASH_DUMP */
199
200#if defined(CONFIG_KEXEC_FILE) || defined(CONFIG_CRASH_DUMP)
201int update_cpus_node(void *fdt);
202#endif
203
204#ifdef CONFIG_PPC_BOOK3S_64
205#include <asm/book3s/64/kexec.h>
206#endif
207
208#ifndef reset_sprs
209#define reset_sprs reset_sprs
210static inline void reset_sprs(void)
211{
212}
213#endif
214
215#endif /* ! __ASSEMBLER__ */
216#endif /* __KERNEL__ */
217#endif /* _ASM_POWERPC_KEXEC_H */