[mirror_ubuntu-disco-kernel.git] / arch / s390 / include / asm / kexec.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright IBM Corp. 2005
 *
 * Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
 *
 */

#ifndef _S390_KEXEC_H
#define _S390_KEXEC_H

#include <asm/processor.h>
#include <asm/page.h>
/*
 * KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
 * I.e. Maximum page that is mapped directly into kernel memory,
 * and kmap is not required.
 */

/* Maximum physical address we can use pages from */
#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)

/* Maximum address we can reach in physical address mode */
#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)

/* Maximum address we can use for the control pages */
/* Not more than 2GB */
#define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31)

/* Allocate control page with GFP_DMA */
#define KEXEC_CONTROL_MEMORY_GFP GFP_DMA

/* Maximum address we can use for the crash control pages */
#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT (-1UL)

/* Allocate one page for the pdp and the second for the code */
#define KEXEC_CONTROL_PAGE_SIZE 4096

/* Alignment of crashkernel memory */
#define KEXEC_CRASH_MEM_ALIGN HPAGE_SIZE

/* The native architecture */
#define KEXEC_ARCH KEXEC_ARCH_S390

/* Provide a dummy definition to avoid build failures. */
static inline void crash_setup_regs(struct pt_regs *newregs,
					struct pt_regs *oldregs) { }

struct kimage;
struct s390_load_data {
	/* Pointer to the kernel buffer. Used to register cmdline etc.. */
	void *kernel_buf;

	/* Total size of loaded segments in memory. Used as an offset. */
	size_t memsz;

	/* Load address of initrd. Used to register INITRD_START in kernel. */
	unsigned long initrd_load_addr;
};

int kexec_file_add_purgatory(struct kimage *image,
			     struct s390_load_data *data);
int kexec_file_add_initrd(struct kimage *image,
			  struct s390_load_data *data,
			  char *initrd, unsigned long initrd_len);
int *kexec_file_update_kernel(struct kimage *iamge,
			      struct s390_load_data *data);

extern const struct kexec_file_ops s390_kexec_image_ops;
extern const struct kexec_file_ops s390_kexec_elf_ops;

#endif /*_S390_KEXEC_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
cf13f0ea	2	/*
a53c8fab	3	* Copyright IBM Corp. 2005
cf13f0ea HC	4	*
	5	* Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
	6	*
	7	*/
	8
	9	#ifndef _S390_KEXEC_H
	10	#define _S390_KEXEC_H
	11
cf13f0ea	12	#include <asm/processor.h>
da477737	13	#include <asm/page.h>
cf13f0ea HC	14	/*
	15	* KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
	16	* I.e. Maximum page that is mapped directly into kernel memory,
	17	* and kmap is not required.
	18	*/
	19
	20	/* Maximum physical address we can use pages from */
	21	#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
	22
	23	/* Maximum address we can reach in physical address mode */
	24	#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
	25
	26	/* Maximum address we can use for the control pages */
	27	/* Not more than 2GB */
a1a392f0	28	#define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31)
cf13f0ea	29
7e01b5ac MS	30	/* Allocate control page with GFP_DMA */
	31	#define KEXEC_CONTROL_MEMORY_GFP GFP_DMA
	32
60a0c68d MH	33	/* Maximum address we can use for the crash control pages */
	34	#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT (-1UL)
	35
cf13f0ea	36	/* Allocate one page for the pdp and the second for the code */
163f6876	37	#define KEXEC_CONTROL_PAGE_SIZE 4096
cf13f0ea	38
dab7a7b1 MH	39	/* Alignment of crashkernel memory */
	40	#define KEXEC_CRASH_MEM_ALIGN HPAGE_SIZE
	41
cf13f0ea HC	42	/* The native architecture */
	43	#define KEXEC_ARCH KEXEC_ARCH_S390
	44
bf208305	45	/* Provide a dummy definition to avoid build failures. */
	46	static inline void crash_setup_regs(struct pt_regs *newregs,
	47	struct pt_regs *oldregs) { }
	48
e49bb0a2 PR	49	struct kimage;
	50	struct s390_load_data {
	51	/* Pointer to the kernel buffer. Used to register cmdline etc.. */
	52	void *kernel_buf;
	53
	54	/* Total size of loaded segments in memory. Used as an offset. */
	55	size_t memsz;
	56
	57	/* Load address of initrd. Used to register INITRD_START in kernel. */
	58	unsigned long initrd_load_addr;
	59	};
	60
	61	int kexec_file_add_purgatory(struct kimage *image,
	62	struct s390_load_data *data);
	63	int kexec_file_add_initrd(struct kimage *image,
	64	struct s390_load_data *data,
	65	char *initrd, unsigned long initrd_len);
	66	int kexec_file_update_kernel(struct kimage iamge,
	67	struct s390_load_data *data);
	68
	69	extern const struct kexec_file_ops s390_kexec_image_ops;
8be01882	70	extern const struct kexec_file_ops s390_kexec_elf_ops;
e49bb0a2	71
cf13f0ea	72	#endif /_S390_KEXEC_H /