kernel/arch/powerpc/include/asm/sections.h

   1 #ifndef _ASM_POWERPC_SECTIONS_H
   2 #define _ASM_POWERPC_SECTIONS_H
   3 #ifdef __KERNEL__
   4
   5 #include <linux/elf.h>
   6 #include <linux/uaccess.h>
   7 #include <asm-generic/sections.h>
   8
   9 #ifdef __powerpc64__
  10
  11 extern char __start_interrupts[];
  12 extern char __end_interrupts[];
  13
  14 extern char __prom_init_toc_start[];
  15 extern char __prom_init_toc_end[];
  16
  17 static inline int in_kernel_text(unsigned long addr)
  18 {
  19         if (addr >= (unsigned long)_stext && addr < (unsigned long)__init_end)
  20                 return 1;
  21
  22         return 0;
  23 }
  24
  25 static inline int overlaps_interrupt_vector_text(unsigned long start,
  26                                                         unsigned long end)
  27 {
  28         unsigned long real_start, real_end;
  29         real_start = __start_interrupts - _stext;
  30         real_end = __end_interrupts - _stext;
  31
  32         return start < (unsigned long)__va(real_end) &&
  33                 (unsigned long)__va(real_start) < end;
  34 }
  35
  36 static inline int overlaps_kernel_text(unsigned long start, unsigned long end)
  37 {
  38         return start < (unsigned long)__init_end &&
  39                 (unsigned long)_stext < end;
  40 }
  41
  42 static inline int overlaps_kvm_tmp(unsigned long start, unsigned long end)
  43 {
  44 #ifdef CONFIG_KVM_GUEST
  45         extern char kvm_tmp[];
  46         return start < (unsigned long)kvm_tmp &&
  47                 (unsigned long)&kvm_tmp[1024 * 1024] < end;
  48 #else
  49         return 0;
  50 #endif
  51 }
  52
  53 #if !defined(_CALL_ELF) || _CALL_ELF != 2
  54 #undef dereference_function_descriptor
  55 static inline void *dereference_function_descriptor(void *ptr)
  56 {
  57         struct ppc64_opd_entry *desc = ptr;
  58         void *p;
  59
  60         if (!probe_kernel_address(&desc->funcaddr, p))
  61                 ptr = p;
  62         return ptr;
  63 }
  64 #endif
  65
  66 #endif
  67
  68 #endif /* __KERNEL__ */
  69 #endif  /* _ASM_POWERPC_SECTIONS_H */