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
59 /*
60 * This function is responsible for capturing register states if coming
61 * via panic or invoking dump using sysrq-trigger.
62 */
crash_setup_regs(struct pt_regs * newregs,struct pt_regs * oldregs)63 static inline void crash_setup_regs(struct pt_regs *newregs,
64 struct pt_regs *oldregs)
65 {
66 if (oldregs)
67 memcpy(newregs, oldregs, sizeof(*newregs));
68 else
69 ppc_save_regs(newregs);
70 }
71
72 extern void kexec_smp_wait(void); /* get and clear naca physid, wait for
73 master to copy new code to 0 */
74 extern int crashing_cpu;
75 extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
76 extern void crash_ipi_callback(struct pt_regs *);
77 extern int crash_wake_offline;
78
79 struct kimage;
80 struct pt_regs;
81 extern void default_machine_kexec(struct kimage *image);
82 extern void default_machine_crash_shutdown(struct pt_regs *regs);
83 extern int crash_shutdown_register(crash_shutdown_t handler);
84 extern int crash_shutdown_unregister(crash_shutdown_t handler);
85
86 extern void crash_kexec_prepare(void);
87 extern void crash_kexec_secondary(struct pt_regs *regs);
88 int __init overlaps_crashkernel(unsigned long start, unsigned long size);
89 extern void reserve_crashkernel(void);
90 extern void machine_kexec_mask_interrupts(void);
91
kdump_in_progress(void)92 static inline bool kdump_in_progress(void)
93 {
94 return crashing_cpu >= 0;
95 }
96
97 void relocate_new_kernel(unsigned long indirection_page, unsigned long reboot_code_buffer,
98 unsigned long start_address) __noreturn;
99
100 void kexec_copy_flush(struct kimage *image);
101
102 #if defined(CONFIG_CRASH_DUMP) && defined(CONFIG_PPC_RTAS)
103 void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
104 #define crash_free_reserved_phys_range crash_free_reserved_phys_range
105 #endif
106
107 #ifdef CONFIG_KEXEC_FILE
108 extern const struct kexec_file_ops kexec_elf64_ops;
109
110 #define ARCH_HAS_KIMAGE_ARCH
111
112 struct kimage_arch {
113 struct crash_mem *exclude_ranges;
114
115 unsigned long backup_start;
116 void *backup_buf;
117 void *fdt;
118 };
119
120 char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
121 unsigned long cmdline_len);
122 int setup_purgatory(struct kimage *image, const void *slave_code,
123 const void *fdt, unsigned long kernel_load_addr,
124 unsigned long fdt_load_addr);
125
126 #ifdef CONFIG_PPC64
127 struct kexec_buf;
128
129 int arch_kexec_kernel_image_probe(struct kimage *image, void *buf, unsigned long buf_len);
130 #define arch_kexec_kernel_image_probe arch_kexec_kernel_image_probe
131
132 int arch_kimage_file_post_load_cleanup(struct kimage *image);
133 #define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
134
135 int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf);
136 #define arch_kexec_locate_mem_hole arch_kexec_locate_mem_hole
137
138 int load_crashdump_segments_ppc64(struct kimage *image,
139 struct kexec_buf *kbuf);
140 int setup_purgatory_ppc64(struct kimage *image, const void *slave_code,
141 const void *fdt, unsigned long kernel_load_addr,
142 unsigned long fdt_load_addr);
143 unsigned int kexec_extra_fdt_size_ppc64(struct kimage *image);
144 int setup_new_fdt_ppc64(const struct kimage *image, void *fdt,
145 unsigned long initrd_load_addr,
146 unsigned long initrd_len, const char *cmdline);
147 #endif /* CONFIG_PPC64 */
148
149 #endif /* CONFIG_KEXEC_FILE */
150
151 #else /* !CONFIG_KEXEC_CORE */
crash_kexec_secondary(struct pt_regs * regs)152 static inline void crash_kexec_secondary(struct pt_regs *regs) { }
153
overlaps_crashkernel(unsigned long start,unsigned long size)154 static inline int overlaps_crashkernel(unsigned long start, unsigned long size)
155 {
156 return 0;
157 }
158
reserve_crashkernel(void)159 static inline void reserve_crashkernel(void) { ; }
160
crash_shutdown_register(crash_shutdown_t handler)161 static inline int crash_shutdown_register(crash_shutdown_t handler)
162 {
163 return 0;
164 }
165
crash_shutdown_unregister(crash_shutdown_t handler)166 static inline int crash_shutdown_unregister(crash_shutdown_t handler)
167 {
168 return 0;
169 }
170
kdump_in_progress(void)171 static inline bool kdump_in_progress(void)
172 {
173 return false;
174 }
175
crash_ipi_callback(struct pt_regs * regs)176 static inline void crash_ipi_callback(struct pt_regs *regs) { }
177
crash_send_ipi(void (* crash_ipi_callback)(struct pt_regs *))178 static inline void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
179 {
180 }
181
182 #endif /* CONFIG_KEXEC_CORE */
183
184 #ifdef CONFIG_PPC_BOOK3S_64
185 #include <asm/book3s/64/kexec.h>
186 #endif
187
188 #ifndef reset_sprs
189 #define reset_sprs reset_sprs
reset_sprs(void)190 static inline void reset_sprs(void)
191 {
192 }
193 #endif
194
195 #endif /* ! __ASSEMBLY__ */
196 #endif /* __KERNEL__ */
197 #endif /* _ASM_POWERPC_KEXEC_H */
198