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 void default_machine_crash_shutdown(struct pt_regs *regs);
  83extern int crash_shutdown_register(crash_shutdown_t handler);
  84extern int crash_shutdown_unregister(crash_shutdown_t handler);
  85
  86extern void crash_kexec_secondary(struct pt_regs *regs);
  87extern int overlaps_crashkernel(unsigned long start, unsigned long size);
  88extern void reserve_crashkernel(void);
  89extern void machine_kexec_mask_interrupts(void);
  90
  91static inline bool kdump_in_progress(void)
  92{
  93        return crashing_cpu >= 0;
  94}
  95
  96void relocate_new_kernel(unsigned long indirection_page, unsigned long reboot_code_buffer,
  97                         unsigned long start_address) __noreturn;
  98
  99#ifdef CONFIG_KEXEC_FILE
 100extern const struct kexec_file_ops kexec_elf64_ops;
 101
 102#define ARCH_HAS_KIMAGE_ARCH
 103
 104struct kimage_arch {
 105        struct crash_mem *exclude_ranges;
 106
 107        unsigned long backup_start;
 108        void *backup_buf;
 109        void *fdt;
 110};
 111
 112char *setup_kdump_cmdline(struct kimage *image, char *cmdline,
 113                          unsigned long cmdline_len);
 114int setup_purgatory(struct kimage *image, const void *slave_code,
 115                    const void *fdt, unsigned long kernel_load_addr,
 116                    unsigned long fdt_load_addr);
 117
 118#ifdef CONFIG_PPC64
 119struct kexec_buf;
 120
 121int load_crashdump_segments_ppc64(struct kimage *image,
 122                                  struct kexec_buf *kbuf);
 123int setup_purgatory_ppc64(struct kimage *image, const void *slave_code,
 124                          const void *fdt, unsigned long kernel_load_addr,
 125                          unsigned long fdt_load_addr);
 126unsigned int kexec_extra_fdt_size_ppc64(struct kimage *image);
 127int setup_new_fdt_ppc64(const struct kimage *image, void *fdt,
 128                        unsigned long initrd_load_addr,
 129                        unsigned long initrd_len, const char *cmdline);
 130#endif /* CONFIG_PPC64 */
 131
 132#endif /* CONFIG_KEXEC_FILE */
 133
 134#else /* !CONFIG_KEXEC_CORE */
 135static inline void crash_kexec_secondary(struct pt_regs *regs) { }
 136
 137static inline int overlaps_crashkernel(unsigned long start, unsigned long size)
 138{
 139        return 0;
 140}
 141
 142static inline void reserve_crashkernel(void) { ; }
 143
 144static inline int crash_shutdown_register(crash_shutdown_t handler)
 145{
 146        return 0;
 147}
 148
 149static inline int crash_shutdown_unregister(crash_shutdown_t handler)
 150{
 151        return 0;
 152}
 153
 154static inline bool kdump_in_progress(void)
 155{
 156        return false;
 157}
 158
 159static inline void crash_ipi_callback(struct pt_regs *regs) { }
 160
 161static inline void crash_send_ipi(void (*crash_ipi_callback)(struct pt_regs *))
 162{
 163}
 164
 165#endif /* CONFIG_KEXEC_CORE */
 166
 167#ifdef CONFIG_PPC_BOOK3S_64
 168#include <asm/book3s/64/kexec.h>
 169#endif
 170
 171#ifndef reset_sprs
 172#define reset_sprs reset_sprs
 173static inline void reset_sprs(void)
 174{
 175}
 176#endif
 177
 178#endif /* ! __ASSEMBLY__ */
 179#endif /* __KERNEL__ */
 180#endif /* _ASM_POWERPC_KEXEC_H */
 181