LXR linux/arch/powerpc/include/asm/kexec.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_POWERPC_KEXEC_H
   3#define _ASM_POWERPC_KEXEC_H
   4#ifdef __KERNEL__
   5
   6#if defined(CONFIG_FSL_BOOKE) || defined(CONFIG_44x)
   7
   8/*
   9 * On FSL-BookE we setup a 1:1 mapping which covers the first 2GiB of memory
  10 * and therefore we can only deal with memory within this range
  11 */
  12#define KEXEC_SOURCE_MEMORY_LIMIT       (2 * 1024 * 1024 * 1024UL - 1)
  13#define KEXEC_DESTINATION_MEMORY_LIMIT  (2 * 1024 * 1024 * 1024UL - 1)
  14#define KEXEC_CONTROL_MEMORY_LIMIT      (2 * 1024 * 1024 * 1024UL - 1)
  15
  16#else
  17
  18/*
  19 * Maximum page that is mapped directly into kernel memory.
  20 * XXX: Since we copy virt we can use any page we allocate
  21 */
  22#define KEXEC_SOURCE_MEMORY_LIMIT (-1UL)
  23
  24/*
  25 * Maximum address we can reach in physical address mode.
  26 * XXX: I want to allow initrd in highmem. Otherwise set to rmo on LPAR.
  27 */
  28#define KEXEC_DESTINATION_MEMORY_LIMIT (-1UL)
  29
  30/* Maximum address we can use for the control code buffer */
  31#ifdef __powerpc64__
  32#define KEXEC_CONTROL_MEMORY_LIMIT (-1UL)
  33#else
  34/* TASK_SIZE, probably left over from use_mm ?? */
  35#define KEXEC_CONTROL_MEMORY_LIMIT TASK_SIZE
  36#endif
  37#endif
  38
  39#define KEXEC_CONTROL_PAGE_SIZE 4096
  40
  41/* The native architecture */
  42#ifdef __powerpc64__
  43#define KEXEC_ARCH KEXEC_ARCH_PPC64
  44#else
  45#define KEXEC_ARCH KEXEC_ARCH_PPC
  46#endif
  47
  48#define KEXEC_STATE_NONE 0
  49#define KEXEC_STATE_IRQS_OFF 1
  50#define KEXEC_STATE_REAL_MODE 2
  51
  52#ifndef __ASSEMBLY__
  53#include <asm/reg.h>
  54
  55typedef void (*crash_shutdown_t)(void);
  56
  57#ifdef CONFIG_KEXEC_CORE
  58
  59/*
  60 * This function is responsible for capturing register states if coming
  61 * via panic or invoking dump using sysrq-trigger.
  62 */
  63static inline void crash_setup_regs(struct pt_regs *newregs,
  64                                        struct pt_regs *oldregs)
  65{
  66        if (oldregs)
  67                memcpy(newregs, oldregs, sizeof(*newregs));
  68        else
  69                ppc_save_regs(newregs);
  70}
  71
  72extern void kexec_smp_wait(void);       /* get and clear naca physid, wait for
  73                                          master to copy new code to 0 */
  74extern int crashing_cpu;
  75extern void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *));
  76extern void crash_ipi_callback(struct pt_regs *);
  77extern int crash_wake_offline;
  78
  79struct kimage;
  80struct pt_regs;
  81extern void default_machine_kexec(struct kimage *image);
  82extern int default_machine_kexec_prepare(struct kimage *image);
  83extern void default_machine_crash_shutdown(struct pt_regs *regs);
  84extern int crash_shutdown_register(crash_shutdown_t handler);
  85extern int crash_shutdown_unregister(crash_shutdown_t handler);
  86
  87extern void crash_kexec_secondary(struct pt_regs *regs);
  88extern int overlaps_crashkernel(unsigned long start, unsigned long size);
  89extern void reserve_crashkernel(void);
  90extern void machine_kexec_mask_interrupts(void);
  91
  92static inline bool kdump_in_progress(void)
  93{
  94        return crashing_cpu >= 0;
  95}
  96
  97void relocate_new_kernel(unsigned long indirection_page, unsigned long reboot_code_buffer,
  98                         unsigned long start_address) __noreturn;
  99
 100#ifdef CONFIG_KEXEC_FILE
 101extern const struct kexec_file_ops kexec_elf64_ops;
 102
 103#ifdef CONFIG_IMA_KEXEC
 104#define ARCH_HAS_KIMAGE_ARCH
 105
 106struct kimage_arch {
 107        phys_addr_t ima_buffer_addr;
 108        size_t ima_buffer_size;
 109};
 110#endif
 111
 112int setup_purgatory(struct kimage *image, const void *slave_code,
 113                    const void *fdt, unsigned long kernel_load_addr,
 114                    unsigned long fdt_load_addr);
 115int setup_new_fdt(const struct kimage *image, void *fdt,
 116                  unsigned long initrd_load_addr, unsigned long initrd_len,
 117                  const char *cmdline);
 118int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size);
 119#endif /* CONFIG_KEXEC_FILE */
 120
 121#else /* !CONFIG_KEXEC_CORE */
 122static inline void crash_kexec_secondary(struct pt_regs *regs) { }
 123
 124static inline int overlaps_crashkernel(unsigned long start, unsigned long size)
 125{
 126        return 0;
 127}
 128
 129static inline void reserve_crashkernel(void) { ; }
 130
 131static inline int crash_shutdown_register(crash_shutdown_t handler)
 132{
 133        return 0;
 134}
 135
 136static inline int crash_shutdown_unregister(crash_shutdown_t handler)
 137{
 138        return 0;
 139}
 140
 141static inline bool kdump_in_progress(void)
 142{
 143        return false;
 144}
 145
 146static inline void crash_ipi_callback(struct pt_regs *regs) { }
 147
 148static inline void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
 149{
 150}
 151
 152#endif /* CONFIG_KEXEC_CORE */
 153#endif /* ! __ASSEMBLY__ */
 154#endif /* __KERNEL__ */
 155#endif /* _ASM_POWERPC_KEXEC_H */
 156