LXR linux/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
  11extern char __start_interrupts[];
  12extern char __end_interrupts[];
  13
  14extern char __prom_init_toc_start[];
  15extern char __prom_init_toc_end[];
  16
  17static 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
  25static 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
  37static 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
  48static 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
  54static 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
  67static 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 */
  82