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 __ASSEMBLY__
53 #include <asm/reg.h>
54
55 typedef void (*crash_shutdown_t)(void);
56
57 #ifdef CONFIG_KEXEC_CORE
58 struct kimage;
59 struct pt_regs;
60
61 extern void kexec_smp_wait(void); /* get and clear naca physid, wait for
62 master to copy new code to 0 */
63 extern void default_machine_kexec(struct kimage *image);
64
65 void relocate_new_kernel(unsigned long indirection_page, unsigned long reboot_code_buffer,
66 unsigned long start_address) __noreturn;
67 void kexec_copy_flush(struct kimage *image);
68
69 #ifdef CONFIG_KEXEC_FILE
70 extern const struct kexec_file_ops kexec_elf64_ops;
71
72 #define ARCH_HAS_KIMAGE_ARCH
73
74 struct kimage_arch {
75 struct crash_mem *exclude_ranges;
76
77 unsigned long backup_start;
78 void *backup_buf;
79 void *fdt;
80 };
81
82 char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
83 unsigned long cmdline_len);
84 int 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
89 struct kexec_buf;
90
91 int 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
94 int arch_kimage_file_post_load_cleanup(struct kimage *image);
95 #define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
96
97 int 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
102 int load_crashdump_segments_ppc64(struct kimage *image,
103 struct kexec_buf *kbuf);
104 int 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);
107 unsigned int kexec_extra_fdt_size_ppc64(struct kimage *image, struct crash_mem *rmem);
108 int 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
116 int __init overlaps_crashkernel(unsigned long start, unsigned long size);
117 extern void arch_reserve_crashkernel(void);
118 #else
arch_reserve_crashkernel(void)119 static inline void arch_reserve_crashkernel(void) {}
overlaps_crashkernel(unsigned long start,unsigned long size)120 static inline int overlaps_crashkernel(unsigned long start, unsigned long size) { return 0; }
121 #endif
122
123 #if defined(CONFIG_CRASH_DUMP)
124 /*
125 * This function is responsible for capturing register states if coming
126 * via panic or invoking dump using sysrq-trigger.
127 */
crash_setup_regs(struct pt_regs * newregs,struct pt_regs * oldregs)128 static inline void crash_setup_regs(struct pt_regs *newregs,
129 struct pt_regs *oldregs)
130 {
131 if (oldregs)
132 memcpy(newregs, oldregs, sizeof(*newregs));
133 else
134 ppc_save_regs(newregs);
135 }
136
137 #ifdef CONFIG_CRASH_HOTPLUG
138 void arch_crash_handle_hotplug_event(struct kimage *image, void *arg);
139 #define arch_crash_handle_hotplug_event arch_crash_handle_hotplug_event
140
141 int arch_crash_hotplug_support(struct kimage *image, unsigned long kexec_flags);
142 #define arch_crash_hotplug_support arch_crash_hotplug_support
143
144 unsigned int arch_crash_get_elfcorehdr_size(void);
145 #define crash_get_elfcorehdr_size arch_crash_get_elfcorehdr_size
146 #endif /* CONFIG_CRASH_HOTPLUG */
147
148 extern int crashing_cpu;
149 extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
150 extern void crash_ipi_callback(struct pt_regs *regs);
151 extern int crash_wake_offline;
152
153 extern int crash_shutdown_register(crash_shutdown_t handler);
154 extern int crash_shutdown_unregister(crash_shutdown_t handler);
155 extern void default_machine_crash_shutdown(struct pt_regs *regs);
156
157 extern void crash_kexec_prepare(void);
158 extern void crash_kexec_secondary(struct pt_regs *regs);
159
kdump_in_progress(void)160 static inline bool kdump_in_progress(void)
161 {
162 return crashing_cpu >= 0;
163 }
164
165 bool is_kdump_kernel(void);
166 #define is_kdump_kernel is_kdump_kernel
167 #if defined(CONFIG_PPC_RTAS)
168 void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
169 #define crash_free_reserved_phys_range crash_free_reserved_phys_range
170 #endif /* CONFIG_PPC_RTAS */
171
172 #else /* !CONFIG_CRASH_DUMP */
crash_kexec_secondary(struct pt_regs * regs)173 static inline void crash_kexec_secondary(struct pt_regs *regs) { }
174
crash_shutdown_register(crash_shutdown_t handler)175 static inline int crash_shutdown_register(crash_shutdown_t handler)
176 {
177 return 0;
178 }
179
crash_shutdown_unregister(crash_shutdown_t handler)180 static inline int crash_shutdown_unregister(crash_shutdown_t handler)
181 {
182 return 0;
183 }
184
kdump_in_progress(void)185 static inline bool kdump_in_progress(void)
186 {
187 return false;
188 }
189
crash_ipi_callback(struct pt_regs * regs)190 static inline void crash_ipi_callback(struct pt_regs *regs) { }
191
crash_send_ipi(void (* crash_ipi_callback)(struct pt_regs *))192 static inline void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
193 {
194 }
195
196 #endif /* CONFIG_CRASH_DUMP */
197
198 #if defined(CONFIG_KEXEC_FILE) || defined(CONFIG_CRASH_DUMP)
199 int update_cpus_node(void *fdt);
200 #endif
201
202 #ifdef CONFIG_PPC_BOOK3S_64
203 #include <asm/book3s/64/kexec.h>
204 #endif
205
206 #ifndef reset_sprs
207 #define reset_sprs reset_sprs
reset_sprs(void)208 static inline void reset_sprs(void)
209 {
210 }
211 #endif
212
213 #endif /* ! __ASSEMBLY__ */
214 #endif /* __KERNEL__ */
215 #endif /* _ASM_POWERPC_KEXEC_H */
216