cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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kexec.h (3119B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * kexec for arm64
      4 *
      5 * Copyright (C) Linaro.
      6 * Copyright (C) Huawei Futurewei Technologies.
      7 */
      8
      9#ifndef _ARM64_KEXEC_H
     10#define _ARM64_KEXEC_H
     11
     12/* Maximum physical address we can use pages from */
     13
     14#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
     15
     16/* Maximum address we can reach in physical address mode */
     17
     18#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
     19
     20/* Maximum address we can use for the control code buffer */
     21
     22#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
     23
     24#define KEXEC_CONTROL_PAGE_SIZE 4096
     25
     26#define KEXEC_ARCH KEXEC_ARCH_AARCH64
     27
     28#ifndef __ASSEMBLY__
     29
     30/**
     31 * crash_setup_regs() - save registers for the panic kernel
     32 *
     33 * @newregs: registers are saved here
     34 * @oldregs: registers to be saved (may be %NULL)
     35 */
     36
     37static inline void crash_setup_regs(struct pt_regs *newregs,
     38				    struct pt_regs *oldregs)
     39{
     40	if (oldregs) {
     41		memcpy(newregs, oldregs, sizeof(*newregs));
     42	} else {
     43		u64 tmp1, tmp2;
     44
     45		__asm__ __volatile__ (
     46			"stp	 x0,   x1, [%2, #16 *  0]\n"
     47			"stp	 x2,   x3, [%2, #16 *  1]\n"
     48			"stp	 x4,   x5, [%2, #16 *  2]\n"
     49			"stp	 x6,   x7, [%2, #16 *  3]\n"
     50			"stp	 x8,   x9, [%2, #16 *  4]\n"
     51			"stp	x10,  x11, [%2, #16 *  5]\n"
     52			"stp	x12,  x13, [%2, #16 *  6]\n"
     53			"stp	x14,  x15, [%2, #16 *  7]\n"
     54			"stp	x16,  x17, [%2, #16 *  8]\n"
     55			"stp	x18,  x19, [%2, #16 *  9]\n"
     56			"stp	x20,  x21, [%2, #16 * 10]\n"
     57			"stp	x22,  x23, [%2, #16 * 11]\n"
     58			"stp	x24,  x25, [%2, #16 * 12]\n"
     59			"stp	x26,  x27, [%2, #16 * 13]\n"
     60			"stp	x28,  x29, [%2, #16 * 14]\n"
     61			"mov	 %0,  sp\n"
     62			"stp	x30,  %0,  [%2, #16 * 15]\n"
     63
     64			"/* faked current PSTATE */\n"
     65			"mrs	 %0, CurrentEL\n"
     66			"mrs	 %1, SPSEL\n"
     67			"orr	 %0, %0, %1\n"
     68			"mrs	 %1, DAIF\n"
     69			"orr	 %0, %0, %1\n"
     70			"mrs	 %1, NZCV\n"
     71			"orr	 %0, %0, %1\n"
     72			/* pc */
     73			"adr	 %1, 1f\n"
     74		"1:\n"
     75			"stp	 %1, %0,   [%2, #16 * 16]\n"
     76			: "=&r" (tmp1), "=&r" (tmp2)
     77			: "r" (newregs)
     78			: "memory"
     79		);
     80	}
     81}
     82
     83#if defined(CONFIG_KEXEC_CORE) && defined(CONFIG_HIBERNATION)
     84extern bool crash_is_nosave(unsigned long pfn);
     85extern void crash_prepare_suspend(void);
     86extern void crash_post_resume(void);
     87#else
     88static inline bool crash_is_nosave(unsigned long pfn) {return false; }
     89static inline void crash_prepare_suspend(void) {}
     90static inline void crash_post_resume(void) {}
     91#endif
     92
     93#if defined(CONFIG_KEXEC_CORE)
     94void cpu_soft_restart(unsigned long el2_switch, unsigned long entry,
     95		      unsigned long arg0, unsigned long arg1,
     96		      unsigned long arg2);
     97#endif
     98
     99#define ARCH_HAS_KIMAGE_ARCH
    100
    101struct kimage_arch {
    102	void *dtb;
    103	phys_addr_t dtb_mem;
    104	phys_addr_t kern_reloc;
    105	phys_addr_t el2_vectors;
    106	phys_addr_t ttbr0;
    107	phys_addr_t ttbr1;
    108	phys_addr_t zero_page;
    109	unsigned long phys_offset;
    110	unsigned long t0sz;
    111};
    112
    113#ifdef CONFIG_KEXEC_FILE
    114extern const struct kexec_file_ops kexec_image_ops;
    115
    116struct kimage;
    117
    118extern int arch_kimage_file_post_load_cleanup(struct kimage *image);
    119extern int load_other_segments(struct kimage *image,
    120		unsigned long kernel_load_addr, unsigned long kernel_size,
    121		char *initrd, unsigned long initrd_len,
    122		char *cmdline);
    123#endif
    124
    125#endif /* __ASSEMBLY__ */
    126
    127#endif