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Directory :  /proc/self/root/lib/modules/5.4.0-163-generic/build/arch/arm/include/asm/

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Current File : /proc/self/root/lib/modules/5.4.0-163-generic/build/arch/arm/include/asm/kexec.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ARM_KEXEC_H
#define _ARM_KEXEC_H

#ifdef CONFIG_KEXEC

/* 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 code buffer */
#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)

#define KEXEC_CONTROL_PAGE_SIZE	4096

#define KEXEC_ARCH KEXEC_ARCH_ARM

#define KEXEC_ARM_ATAGS_OFFSET  0x1000
#define KEXEC_ARM_ZIMAGE_OFFSET 0x8000

#ifndef __ASSEMBLY__

#define ARCH_HAS_KIMAGE_ARCH
struct kimage_arch {
	u32 kernel_r2;
};

/**
 * crash_setup_regs() - save registers for the panic kernel
 * @newregs: registers are saved here
 * @oldregs: registers to be saved (may be %NULL)
 *
 * Function copies machine registers from @oldregs to @newregs. If @oldregs is
 * %NULL then current registers are stored there.
 */
static inline void crash_setup_regs(struct pt_regs *newregs,
				    struct pt_regs *oldregs)
{
	if (oldregs) {
		memcpy(newregs, oldregs, sizeof(*newregs));
	} else {
		__asm__ __volatile__ (
			"stmia	%[regs_base], {r0-r12}\n\t"
			"mov	%[_ARM_sp], sp\n\t"
			"str	lr, %[_ARM_lr]\n\t"
			"adr	%[_ARM_pc], 1f\n\t"
			"mrs	%[_ARM_cpsr], cpsr\n\t"
		"1:"
			: [_ARM_pc] "=r" (newregs->ARM_pc),
			  [_ARM_cpsr] "=r" (newregs->ARM_cpsr),
			  [_ARM_sp] "=r" (newregs->ARM_sp),
			  [_ARM_lr] "=o" (newregs->ARM_lr)
			: [regs_base] "r" (&newregs->ARM_r0)
			: "memory"
		);
	}
}

/* Function pointer to optional machine-specific reinitialization */
extern void (*kexec_reinit)(void);

static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
{
	return phys_to_idmap(phys);
}
#define phys_to_boot_phys phys_to_boot_phys

static inline phys_addr_t boot_phys_to_phys(unsigned long entry)
{
	return idmap_to_phys(entry);
}
#define boot_phys_to_phys boot_phys_to_phys

static inline unsigned long page_to_boot_pfn(struct page *page)
{
	return page_to_pfn(page) + (arch_phys_to_idmap_offset >> PAGE_SHIFT);
}
#define page_to_boot_pfn page_to_boot_pfn

static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
{
	return pfn_to_page(boot_pfn - (arch_phys_to_idmap_offset >> PAGE_SHIFT));
}
#define boot_pfn_to_page boot_pfn_to_page

#endif /* __ASSEMBLY__ */

#endif /* CONFIG_KEXEC */

#endif /* _ARM_KEXEC_H */

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