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 */
82