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_FSL_BOOKE) || 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_secondary(struct pt_regs *regs);
87 extern int overlaps_crashkernel(unsigned long start, unsigned long size);
88 extern void reserve_crashkernel(void);
89 extern void machine_kexec_mask_interrupts(void);
90 
kdump_in_progress(void)91 static inline bool kdump_in_progress(void)
92 {
93 	return crashing_cpu >= 0;
94 }
95 
96 void relocate_new_kernel(unsigned long indirection_page, unsigned long reboot_code_buffer,
97 			 unsigned long start_address) __noreturn;
98 
99 #ifdef CONFIG_KEXEC_FILE
100 extern const struct kexec_file_ops kexec_elf64_ops;
101 
102 #define ARCH_HAS_KIMAGE_ARCH
103 
104 struct kimage_arch {
105 	struct crash_mem *exclude_ranges;
106 
107 	unsigned long backup_start;
108 	void *backup_buf;
109 	void *fdt;
110 };
111 
112 char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
113 			  unsigned long cmdline_len);
114 int setup_purgatory(struct kimage *image, const void *slave_code,
115 		    const void *fdt, unsigned long kernel_load_addr,
116 		    unsigned long fdt_load_addr);
117 
118 #ifdef CONFIG_PPC64
119 struct kexec_buf;
120 
121 int load_crashdump_segments_ppc64(struct kimage *image,
122 				  struct kexec_buf *kbuf);
123 int setup_purgatory_ppc64(struct kimage *image, const void *slave_code,
124 			  const void *fdt, unsigned long kernel_load_addr,
125 			  unsigned long fdt_load_addr);
126 unsigned int kexec_extra_fdt_size_ppc64(struct kimage *image);
127 int setup_new_fdt_ppc64(const struct kimage *image, void *fdt,
128 			unsigned long initrd_load_addr,
129 			unsigned long initrd_len, const char *cmdline);
130 #endif /* CONFIG_PPC64 */
131 
132 #endif /* CONFIG_KEXEC_FILE */
133 
134 #else /* !CONFIG_KEXEC_CORE */
crash_kexec_secondary(struct pt_regs * regs)135 static inline void crash_kexec_secondary(struct pt_regs *regs) { }
136 
overlaps_crashkernel(unsigned long start,unsigned long size)137 static inline int overlaps_crashkernel(unsigned long start, unsigned long size)
138 {
139 	return 0;
140 }
141 
reserve_crashkernel(void)142 static inline void reserve_crashkernel(void) { ; }
143 
crash_shutdown_register(crash_shutdown_t handler)144 static inline int crash_shutdown_register(crash_shutdown_t handler)
145 {
146 	return 0;
147 }
148 
crash_shutdown_unregister(crash_shutdown_t handler)149 static inline int crash_shutdown_unregister(crash_shutdown_t handler)
150 {
151 	return 0;
152 }
153 
kdump_in_progress(void)154 static inline bool kdump_in_progress(void)
155 {
156 	return false;
157 }
158 
crash_ipi_callback(struct pt_regs * regs)159 static inline void crash_ipi_callback(struct pt_regs *regs) { }
160 
crash_send_ipi(void (* crash_ipi_callback)(struct pt_regs *))161 static inline void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
162 {
163 }
164 
165 #endif /* CONFIG_KEXEC_CORE */
166 
167 #ifdef CONFIG_PPC_BOOK3S_64
168 #include <asm/book3s/64/kexec.h>
169 #endif
170 
171 #ifndef reset_sprs
172 #define reset_sprs reset_sprs
reset_sprs(void)173 static inline void reset_sprs(void)
174 {
175 }
176 #endif
177 
178 #endif /* ! __ASSEMBLY__ */
179 #endif /* __KERNEL__ */
180 #endif /* _ASM_POWERPC_KEXEC_H */
181