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 (2255B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _ARM_KEXEC_H
      3#define _ARM_KEXEC_H
      4
      5#ifdef CONFIG_KEXEC
      6
      7/* Maximum physical address we can use pages from */
      8#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
      9/* Maximum address we can reach in physical address mode */
     10#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
     11/* Maximum address we can use for the control code buffer */
     12#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
     13
     14#define KEXEC_CONTROL_PAGE_SIZE	4096
     15
     16#define KEXEC_ARCH KEXEC_ARCH_ARM
     17
     18#define KEXEC_ARM_ATAGS_OFFSET  0x1000
     19#define KEXEC_ARM_ZIMAGE_OFFSET 0x8000
     20
     21#ifndef __ASSEMBLY__
     22
     23#define ARCH_HAS_KIMAGE_ARCH
     24struct kimage_arch {
     25	u32 kernel_r2;
     26};
     27
     28/**
     29 * crash_setup_regs() - save registers for the panic kernel
     30 * @newregs: registers are saved here
     31 * @oldregs: registers to be saved (may be %NULL)
     32 *
     33 * Function copies machine registers from @oldregs to @newregs. If @oldregs is
     34 * %NULL then current registers are stored there.
     35 */
     36static inline void crash_setup_regs(struct pt_regs *newregs,
     37				    struct pt_regs *oldregs)
     38{
     39	if (oldregs) {
     40		memcpy(newregs, oldregs, sizeof(*newregs));
     41	} else {
     42		__asm__ __volatile__ (
     43			"stmia	%[regs_base], {r0-r12}\n\t"
     44			"mov	%[_ARM_sp], sp\n\t"
     45			"str	lr, %[_ARM_lr]\n\t"
     46			"adr	%[_ARM_pc], 1f\n\t"
     47			"mrs	%[_ARM_cpsr], cpsr\n\t"
     48		"1:"
     49			: [_ARM_pc] "=r" (newregs->ARM_pc),
     50			  [_ARM_cpsr] "=r" (newregs->ARM_cpsr),
     51			  [_ARM_sp] "=r" (newregs->ARM_sp),
     52			  [_ARM_lr] "=o" (newregs->ARM_lr)
     53			: [regs_base] "r" (&newregs->ARM_r0)
     54			: "memory"
     55		);
     56	}
     57}
     58
     59static inline unsigned long phys_to_boot_phys(phys_addr_t phys)
     60{
     61	return phys_to_idmap(phys);
     62}
     63#define phys_to_boot_phys phys_to_boot_phys
     64
     65static inline phys_addr_t boot_phys_to_phys(unsigned long entry)
     66{
     67	return idmap_to_phys(entry);
     68}
     69#define boot_phys_to_phys boot_phys_to_phys
     70
     71static inline unsigned long page_to_boot_pfn(struct page *page)
     72{
     73	return page_to_pfn(page) + (arch_phys_to_idmap_offset >> PAGE_SHIFT);
     74}
     75#define page_to_boot_pfn page_to_boot_pfn
     76
     77static inline struct page *boot_pfn_to_page(unsigned long boot_pfn)
     78{
     79	return pfn_to_page(boot_pfn - (arch_phys_to_idmap_offset >> PAGE_SHIFT));
     80}
     81#define boot_pfn_to_page boot_pfn_to_page
     82
     83#endif /* __ASSEMBLY__ */
     84
     85#endif /* CONFIG_KEXEC */
     86
     87#endif /* _ARM_KEXEC_H */