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
58
59/*
60 * This function is responsible for capturing register states if coming
61 * via panic or invoking dump using sysrq-trigger.
62 */
63static 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
72extern void kexec_smp_wait(void);	/* get and clear naca physid, wait for
73					  master to copy new code to 0 */
74extern int crashing_cpu;
75extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
76extern void crash_ipi_callback(struct pt_regs *);
77extern int crash_wake_offline;
78
79struct kimage;
80struct pt_regs;
81extern void default_machine_kexec(struct kimage *image);
82extern void default_machine_crash_shutdown(struct pt_regs *regs);
83extern int crash_shutdown_register(crash_shutdown_t handler);
84extern int crash_shutdown_unregister(crash_shutdown_t handler);
85
86extern void crash_kexec_prepare(void);
87extern void crash_kexec_secondary(struct pt_regs *regs);
88int __init overlaps_crashkernel(unsigned long start, unsigned long size);
89extern void reserve_crashkernel(void);
90extern void machine_kexec_mask_interrupts(void);
91
92static inline bool kdump_in_progress(void)
93{
94	return crashing_cpu >= 0;
95}
96
97void relocate_new_kernel(unsigned long indirection_page, unsigned long reboot_code_buffer,
98			 unsigned long start_address) __noreturn;
99
100void kexec_copy_flush(struct kimage *image);
101
102#if defined(CONFIG_CRASH_DUMP) && defined(CONFIG_PPC_RTAS)
103void 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
108extern const struct kexec_file_ops kexec_elf64_ops;
109
110#define ARCH_HAS_KIMAGE_ARCH
111
112struct kimage_arch {
113	struct crash_mem *exclude_ranges;
114
115	unsigned long backup_start;
116	void *backup_buf;
117	void *fdt;
118};
119
120char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
121			  unsigned long cmdline_len);
122int 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
127struct kexec_buf;
128
129int 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
132int arch_kimage_file_post_load_cleanup(struct kimage *image);
133#define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup
134
135int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf);
136#define arch_kexec_locate_mem_hole arch_kexec_locate_mem_hole
137
138int load_crashdump_segments_ppc64(struct kimage *image,
139				  struct kexec_buf *kbuf);
140int 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);
143unsigned int kexec_extra_fdt_size_ppc64(struct kimage *image);
144int 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 */
152static inline void crash_kexec_secondary(struct pt_regs *regs) { }
153
154static inline int overlaps_crashkernel(unsigned long start, unsigned long size)
155{
156	return 0;
157}
158
159static inline void reserve_crashkernel(void) { ; }
160
161static inline int crash_shutdown_register(crash_shutdown_t handler)
162{
163	return 0;
164}
165
166static inline int crash_shutdown_unregister(crash_shutdown_t handler)
167{
168	return 0;
169}
170
171static inline bool kdump_in_progress(void)
172{
173	return false;
174}
175
176static inline void crash_ipi_callback(struct pt_regs *regs) { }
177
178static 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
190static inline void reset_sprs(void)
191{
192}
193#endif
194
195#endif /* ! __ASSEMBLY__ */
196#endif /* __KERNEL__ */
197#endif /* _ASM_POWERPC_KEXEC_H */
198