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