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
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);
64extern void machine_kexec_mask_interrupts(void);
65
66void relocate_new_kernel(unsigned long indirection_page, unsigned long reboot_code_buffer,
67			 unsigned long start_address) __noreturn;
68void kexec_copy_flush(struct kimage *image);
69
70#ifdef CONFIG_KEXEC_FILE
71extern const struct kexec_file_ops kexec_elf64_ops;
72
73#define ARCH_HAS_KIMAGE_ARCH
74
75struct kimage_arch {
76	struct crash_mem *exclude_ranges;
77
78	unsigned long backup_start;
79	void *backup_buf;
80	void *fdt;
81};
82
83char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
84			  unsigned long cmdline_len);
85int setup_purgatory(struct kimage *image, const void *slave_code,
86		    const void *fdt, unsigned long kernel_load_addr,
87		    unsigned long fdt_load_addr);
88
89#ifdef CONFIG_PPC64
90struct kexec_buf;
91
92int arch_kexec_kernel_image_probe(struct kimage *image, void *buf, unsigned long buf_len);
93#define arch_kexec_kernel_image_probe arch_kexec_kernel_image_probe
94
95int arch_kimage_file_post_load_cleanup(struct kimage *image);
96#define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
97
98int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf);
99#define arch_kexec_locate_mem_hole arch_kexec_locate_mem_hole
100
101int load_crashdump_segments_ppc64(struct kimage *image,
102				  struct kexec_buf *kbuf);
103int setup_purgatory_ppc64(struct kimage *image, const void *slave_code,
104			  const void *fdt, unsigned long kernel_load_addr,
105			  unsigned long fdt_load_addr);
106unsigned int kexec_extra_fdt_size_ppc64(struct kimage *image);
107int setup_new_fdt_ppc64(const struct kimage *image, void *fdt,
108			unsigned long initrd_load_addr,
109			unsigned long initrd_len, const char *cmdline);
110#endif /* CONFIG_PPC64 */
111
112#endif /* CONFIG_KEXEC_FILE */
113
114#endif /* CONFIG_KEXEC_CORE */
115
116#ifdef CONFIG_CRASH_RESERVE
117int __init overlaps_crashkernel(unsigned long start, unsigned long size);
118extern void reserve_crashkernel(void);
119#else
120static inline void reserve_crashkernel(void) {}
121static inline int overlaps_crashkernel(unsigned long start, unsigned long size) { return 0; }
122#endif
123
124#if defined(CONFIG_CRASH_DUMP)
125/*
126 * This function is responsible for capturing register states if coming
127 * via panic or invoking dump using sysrq-trigger.
128 */
129static inline void crash_setup_regs(struct pt_regs *newregs,
130					struct pt_regs *oldregs)
131{
132	if (oldregs)
133		memcpy(newregs, oldregs, sizeof(*newregs));
134	else
135		ppc_save_regs(newregs);
136}
137
138extern int crashing_cpu;
139extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
140extern void crash_ipi_callback(struct pt_regs *regs);
141extern int crash_wake_offline;
142
143extern int crash_shutdown_register(crash_shutdown_t handler);
144extern int crash_shutdown_unregister(crash_shutdown_t handler);
145extern void default_machine_crash_shutdown(struct pt_regs *regs);
146
147extern void crash_kexec_prepare(void);
148extern void crash_kexec_secondary(struct pt_regs *regs);
149
150static inline bool kdump_in_progress(void)
151{
152	return crashing_cpu >= 0;
153}
154
155bool is_kdump_kernel(void);
156#define is_kdump_kernel			is_kdump_kernel
157#if defined(CONFIG_PPC_RTAS)
158void crash_free_reserved_phys_range(unsigned long begin, unsigned long end);
159#define crash_free_reserved_phys_range crash_free_reserved_phys_range
160#endif /* CONFIG_PPC_RTAS */
161
162#else /* !CONFIG_CRASH_DUMP */
163static inline void crash_kexec_secondary(struct pt_regs *regs) { }
164
165static inline int crash_shutdown_register(crash_shutdown_t handler)
166{
167	return 0;
168}
169
170static inline int crash_shutdown_unregister(crash_shutdown_t handler)
171{
172	return 0;
173}
174
175static inline bool kdump_in_progress(void)
176{
177	return false;
178}
179
180static inline void crash_ipi_callback(struct pt_regs *regs) { }
181
182static inline void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
183{
184}
185
186#endif /* CONFIG_CRASH_DUMP */
187
188#ifdef CONFIG_PPC_BOOK3S_64
189#include <asm/book3s/64/kexec.h>
190#endif
191
192#ifndef reset_sprs
193#define reset_sprs reset_sprs
194static inline void reset_sprs(void)
195{
196}
197#endif
198
199#endif /* ! __ASSEMBLY__ */
200#endif /* __KERNEL__ */
201#endif /* _ASM_POWERPC_KEXEC_H */
202