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805bc0bc23
This patch adds support for building a relocatable kernel with -fPIE. The kernel will be relocated to 0 early in the boot process. Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Reviewed-by: Philipp Rudo <prudo@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright IBM Corp. 2005
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*
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* Author(s): Rolf Adelsberger <adelsberger@de.ibm.com>
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*
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*/
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#ifndef _S390_KEXEC_H
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#define _S390_KEXEC_H
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#include <asm/processor.h>
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#include <asm/page.h>
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#include <asm/setup.h>
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/*
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* KEXEC_SOURCE_MEMORY_LIMIT maximum page get_free_page can return.
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* I.e. Maximum page that is mapped directly into kernel memory,
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* and kmap is not required.
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*/
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/* Maximum physical address we can use pages from */
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#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
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/* Maximum address we can reach in physical address mode */
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#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
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/* Maximum address we can use for the control pages */
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/* Not more than 2GB */
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#define KEXEC_CONTROL_MEMORY_LIMIT (1UL<<31)
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/* Allocate control page with GFP_DMA */
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#define KEXEC_CONTROL_MEMORY_GFP GFP_DMA
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/* Maximum address we can use for the crash control pages */
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#define KEXEC_CRASH_CONTROL_MEMORY_LIMIT (-1UL)
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/* Allocate one page for the pdp and the second for the code */
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#define KEXEC_CONTROL_PAGE_SIZE 4096
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/* Alignment of crashkernel memory */
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#define KEXEC_CRASH_MEM_ALIGN HPAGE_SIZE
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/* The native architecture */
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#define KEXEC_ARCH KEXEC_ARCH_S390
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/* Allow kexec_file to load a segment to 0 */
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#define KEXEC_BUF_MEM_UNKNOWN -1
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/* Provide a dummy definition to avoid build failures. */
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static inline void crash_setup_regs(struct pt_regs *newregs,
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struct pt_regs *oldregs) { }
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struct kimage;
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struct s390_load_data {
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/* Pointer to the kernel buffer. Used to register cmdline etc.. */
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void *kernel_buf;
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/* Load address of the kernel_buf. */
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unsigned long kernel_mem;
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/* Parmarea in the kernel buffer. */
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struct parmarea *parm;
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/* Total size of loaded segments in memory. Used as an offset. */
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size_t memsz;
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struct ipl_report *report;
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};
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int s390_verify_sig(const char *kernel, unsigned long kernel_len);
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void *kexec_file_add_components(struct kimage *image,
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int (*add_kernel)(struct kimage *image,
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struct s390_load_data *data));
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int arch_kexec_do_relocs(int r_type, void *loc, unsigned long val,
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unsigned long addr);
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extern const struct kexec_file_ops s390_kexec_image_ops;
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extern const struct kexec_file_ops s390_kexec_elf_ops;
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#endif /*_S390_KEXEC_H */
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