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
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 int default_machine_kexec_prepare(struct kimage *image);
83extern void default_machine_crash_shutdown(struct pt_regs *regs);
84extern int crash_shutdown_register(crash_shutdown_t handler);
85extern int crash_shutdown_unregister(crash_shutdown_t handler);
86
87extern void crash_kexec_secondary(struct pt_regs *regs);
88extern int 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
100#ifdef CONFIG_KEXEC_FILE
101extern const struct kexec_file_ops kexec_elf64_ops;
102
103#define ARCH_HAS_KIMAGE_ARCH
104
105struct kimage_arch {
106	struct crash_mem *exclude_ranges;
107
108	unsigned long backup_start;
109	void *backup_buf;
110
111	unsigned long elfcorehdr_addr;
112	unsigned long elf_headers_sz;
113	void *elf_headers;
114
115#ifdef CONFIG_IMA_KEXEC
116	phys_addr_t ima_buffer_addr;
117	size_t ima_buffer_size;
118#endif
119};
120
121char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
122			  unsigned long cmdline_len);
123int setup_purgatory(struct kimage *image, const void *slave_code,
124		    const void *fdt, unsigned long kernel_load_addr,
125		    unsigned long fdt_load_addr);
126int setup_new_fdt(const struct kimage *image, void *fdt,
127		  unsigned long initrd_load_addr, unsigned long initrd_len,
128		  const char *cmdline);
129int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size);
130
131#ifdef CONFIG_PPC64
132struct kexec_buf;
133
134int load_crashdump_segments_ppc64(struct kimage *image,
135				  struct kexec_buf *kbuf);
136int setup_purgatory_ppc64(struct kimage *image, const void *slave_code,
137			  const void *fdt, unsigned long kernel_load_addr,
138			  unsigned long fdt_load_addr);
139unsigned int kexec_fdt_totalsize_ppc64(struct kimage *image);
140int setup_new_fdt_ppc64(const struct kimage *image, void *fdt,
141			unsigned long initrd_load_addr,
142			unsigned long initrd_len, const char *cmdline);
143#endif /* CONFIG_PPC64 */
144
145#endif /* CONFIG_KEXEC_FILE */
146
147#else /* !CONFIG_KEXEC_CORE */
148static inline void crash_kexec_secondary(struct pt_regs *regs) { }
149
150static inline int overlaps_crashkernel(unsigned long start, unsigned long size)
151{
152	return 0;
153}
154
155static inline void reserve_crashkernel(void) { ; }
156
157static inline int crash_shutdown_register(crash_shutdown_t handler)
158{
159	return 0;
160}
161
162static inline int crash_shutdown_unregister(crash_shutdown_t handler)
163{
164	return 0;
165}
166
167static inline bool kdump_in_progress(void)
168{
169	return false;
170}
171
172static inline void crash_ipi_callback(struct pt_regs *regs) { }
173
174static inline void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
175{
176}
177
178#endif /* CONFIG_KEXEC_CORE */
179
180#ifdef CONFIG_PPC_BOOK3S_64
181#include <asm/book3s/64/kexec.h>
182#endif
183
184#ifndef reset_sprs
185#define reset_sprs reset_sprs
186static inline void reset_sprs(void)
187{
188}
189#endif
190
191#endif /* ! __ASSEMBLY__ */
192#endif /* __KERNEL__ */
193#endif /* _ASM_POWERPC_KEXEC_H */
194