1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright IBM Corp. 2005
4  *
5  * Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
6  *
7  */
8 
9 #ifndef _S390_KEXEC_H
10 #define _S390_KEXEC_H
11 
12 #include <asm/processor.h>
13 #include <asm/page.h>
14 #include <asm/setup.h>
15 /*
16  * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
17  * I.e. Maximum page that is mapped directly into kernel memory,
18  * and kmap is not required.
19  */
20 
21 /* Maximum physical address we can use pages from */
22 #define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
23 
24 /* Maximum address we can reach in physical address mode */
25 #define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
26 
27 /* Maximum address we can use for the control pages */
28 /* Not more than 2GB */
29 #define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31)
30 
31 /* Allocate control page with GFP_DMA */
32 #define KEXEC_CONTROL_MEMORY_GFP GFP_DMA
33 
34 /* Maximum address we can use for the crash control pages */
35 #define KEXEC_CRASH_CONTROL_MEMORY_LIMIT (-1UL)
36 
37 /* Allocate one page for the pdp and the second for the code */
38 #define KEXEC_CONTROL_PAGE_SIZE 4096
39 
40 /* Alignment of crashkernel memory */
41 #define KEXEC_CRASH_MEM_ALIGN HPAGE_SIZE
42 
43 /* The native architecture */
44 #define KEXEC_ARCH KEXEC_ARCH_S390
45 
46 /* Allow kexec_file to load a segment to 0 */
47 #define KEXEC_BUF_MEM_UNKNOWN -1
48 
49 /* Provide a dummy definition to avoid build failures. */
crash_setup_regs(struct pt_regs * newregs,struct pt_regs * oldregs)50 static inline void crash_setup_regs(struct pt_regs *newregs,
51 					struct pt_regs *oldregs) { }
52 
53 struct kimage;
54 struct s390_load_data {
55 	/* Pointer to the kernel buffer. Used to register cmdline etc.. */
56 	void *kernel_buf;
57 
58 	/* Load address of the kernel_buf. */
59 	unsigned long kernel_mem;
60 
61 	/* Parmarea in the kernel buffer. */
62 	struct parmarea *parm;
63 
64 	/* Total size of loaded segments in memory. Used as an offset. */
65 	size_t memsz;
66 
67 	struct ipl_report *report;
68 };
69 
70 int s390_verify_sig(const char *kernel, unsigned long kernel_len);
71 void *kexec_file_add_components(struct kimage *image,
72 				int (*add_kernel)(struct kimage *image,
73 						  struct s390_load_data *data));
74 int arch_kexec_do_relocs(int r_type, void *loc, unsigned long val,
75 			 unsigned long addr);
76 
77 #define ARCH_HAS_KIMAGE_ARCH
78 
79 struct kimage_arch {
80 	void *ipl_buf;
81 };
82 
83 extern const struct kexec_file_ops s390_kexec_image_ops;
84 extern const struct kexec_file_ops s390_kexec_elf_ops;
85 
86 #endif /*_S390_KEXEC_H */
87