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 int default_machine_kexec_prepare(struct kimage *image);
83 extern void default_machine_crash_shutdown(struct pt_regs *regs);
84 extern int crash_shutdown_register(crash_shutdown_t handler);
85 extern int crash_shutdown_unregister(crash_shutdown_t handler);
86
87 extern void crash_kexec_secondary(struct pt_regs *regs);
88 extern int 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 #ifdef CONFIG_KEXEC_FILE
101 extern const struct kexec_file_ops kexec_elf64_ops;
102
103 #ifdef CONFIG_IMA_KEXEC
104 #define ARCH_HAS_KIMAGE_ARCH
105
106 struct kimage_arch {
107 phys_addr_t ima_buffer_addr;
108 size_t ima_buffer_size;
109 };
110 #endif
111
112 int setup_purgatory(struct kimage *image, const void *slave_code,
113 const void *fdt, unsigned long kernel_load_addr,
114 unsigned long fdt_load_addr);
115 int setup_new_fdt(const struct kimage *image, void *fdt,
116 unsigned long initrd_load_addr, unsigned long initrd_len,
117 const char *cmdline);
118 int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size);
119 #endif /* CONFIG_KEXEC_FILE */
120
121 #else /* !CONFIG_KEXEC_CORE */
crash_kexec_secondary(struct pt_regs * regs)122 static inline void crash_kexec_secondary(struct pt_regs *regs) { }
123
overlaps_crashkernel(unsigned long start,unsigned long size)124 static inline int overlaps_crashkernel(unsigned long start, unsigned long size)
125 {
126 return 0;
127 }
128
reserve_crashkernel(void)129 static inline void reserve_crashkernel(void) { ; }
130
crash_shutdown_register(crash_shutdown_t handler)131 static inline int crash_shutdown_register(crash_shutdown_t handler)
132 {
133 return 0;
134 }
135
crash_shutdown_unregister(crash_shutdown_t handler)136 static inline int crash_shutdown_unregister(crash_shutdown_t handler)
137 {
138 return 0;
139 }
140
kdump_in_progress(void)141 static inline bool kdump_in_progress(void)
142 {
143 return false;
144 }
145
crash_ipi_callback(struct pt_regs * regs)146 static inline void crash_ipi_callback(struct pt_regs *regs) { }
147
crash_send_ipi(void (* crash_ipi_callback)(struct pt_regs *))148 static inline void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
149 {
150 }
151
152 #endif /* CONFIG_KEXEC_CORE */
153 #endif /* ! __ASSEMBLY__ */
154 #endif /* __KERNEL__ */
155 #endif /* _ASM_POWERPC_KEXEC_H */
156
