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 extern char __head_end[];
  10
  11 #ifdef __powerpc64__
  12
  13 extern char __start_interrupts[];
  14 extern char __end_interrupts[];
  15
  16 extern char __prom_init_toc_start[];
  17 extern char __prom_init_toc_end[];
  18
  19 static inline int in_kernel_text(unsigned long addr)
  20 {
  21         if (addr >= (unsigned long)_stext && addr < (unsigned long)__init_end)
  22                 return 1;
  23
  24         return 0;
  25 }
  26
  27 static inline unsigned long kernel_toc_addr(void)
  28 {
  29         /* Defined by the linker, see vmlinux.lds.S */
  30         extern unsigned long __toc_start;
  31
  32         /*
  33          * The TOC register (r2) points 32kB into the TOC, so that 64kB of
  34          * the TOC can be addressed using a single machine instruction.
  35          */
  36         return (unsigned long)(&__toc_start) + 0x8000UL;
  37 }
  38
  39 static inline int overlaps_interrupt_vector_text(unsigned long start,
  40                                                         unsigned long end)
  41 {
  42         unsigned long real_start, real_end;
  43         real_start = __start_interrupts - _stext;
  44         real_end = __end_interrupts - _stext;
  45
  46         return start < (unsigned long)__va(real_end) &&
  47                 (unsigned long)__va(real_start) < end;
  48 }
  49
  50 static inline int overlaps_kernel_text(unsigned long start, unsigned long end)
  51 {
  52         return start < (unsigned long)__init_end &&
  53                 (unsigned long)_stext < end;
  54 }
  55
  56 static inline int overlaps_kvm_tmp(unsigned long start, unsigned long end)
  57 {
  58 #ifdef CONFIG_KVM_GUEST
  59         extern char kvm_tmp[];
  60         return start < (unsigned long)kvm_tmp &&
  61                 (unsigned long)&kvm_tmp[1024 * 1024] < end;
  62 #else
  63         return 0;
  64 #endif
  65 }
  66
  67 #ifdef PPC64_ELF_ABI_v1
  68 #undef dereference_function_descriptor
  69 static inline void *dereference_function_descriptor(void *ptr)
  70 {
  71         struct ppc64_opd_entry *desc = ptr;
  72         void *p;
  73
  74         if (!probe_kernel_address(&desc->funcaddr, p))
  75                 ptr = p;
  76         return ptr;
  77 }
  78 #endif /* PPC64_ELF_ABI_v1 */
  79
  80 #endif
  81
  82 #endif /* __KERNEL__ */
  83 #endif  /* _ASM_POWERPC_SECTIONS_H */