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/*
* kexec for arm64
*
* Copyright (C) Linaro.
* Copyright (C) Huawei Futurewei Technologies.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef _ARM64_KEXEC_H
#define _ARM64_KEXEC_H
/* 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_AARCH64
#ifndef __ASSEMBLY__
/**
* crash_setup_regs() - save registers for the panic kernel
*
* @newregs: registers are saved here
* @oldregs: registers to be saved (may be %NULL)
*/
static inline void crash_setup_regs(struct pt_regs *newregs,
struct pt_regs *oldregs)
{
if (oldregs) {
memcpy(newregs, oldregs, sizeof(*newregs));
} else {
u64 tmp1, tmp2;
__asm__ __volatile__ (
"stp x0, x1, [%2, #16 * 0]\n"
"stp x2, x3, [%2, #16 * 1]\n"
"stp x4, x5, [%2, #16 * 2]\n"
"stp x6, x7, [%2, #16 * 3]\n"
"stp x8, x9, [%2, #16 * 4]\n"
"stp x10, x11, [%2, #16 * 5]\n"
"stp x12, x13, [%2, #16 * 6]\n"
"stp x14, x15, [%2, #16 * 7]\n"
"stp x16, x17, [%2, #16 * 8]\n"
"stp x18, x19, [%2, #16 * 9]\n"
"stp x20, x21, [%2, #16 * 10]\n"
"stp x22, x23, [%2, #16 * 11]\n"
"stp x24, x25, [%2, #16 * 12]\n"
"stp x26, x27, [%2, #16 * 13]\n"
"stp x28, x29, [%2, #16 * 14]\n"
"mov %0, sp\n"
"stp x30, %0, [%2, #16 * 15]\n"
"/* faked current PSTATE */\n"
"mrs %0, CurrentEL\n"
"mrs %1, SPSEL\n"
"orr %0, %0, %1\n"
"mrs %1, DAIF\n"
"orr %0, %0, %1\n"
"mrs %1, NZCV\n"
"orr %0, %0, %1\n"
/* pc */
"adr %1, 1f\n"
"1:\n"
"stp %1, %0, [%2, #16 * 16]\n"
: "=&r" (tmp1), "=&r" (tmp2)
: "r" (newregs)
: "memory"
);
}
}
#if defined(CONFIG_KEXEC_CORE) && defined(CONFIG_HIBERNATION)
extern bool crash_is_nosave(unsigned long pfn);
extern void crash_prepare_suspend(void);
extern void crash_post_resume(void);
#else
static inline bool crash_is_nosave(unsigned long pfn) {return false; }
static inline void crash_prepare_suspend(void) {}
static inline void crash_post_resume(void) {}
#endif
#endif /* __ASSEMBLY__ */
#endif
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