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 */
84