Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
9extern char __head_end[];
10
11#ifdef __powerpc64__
12
13extern char __start_interrupts[];
14extern char __end_interrupts[];
15
16extern char __prom_init_toc_start[];
17extern char __prom_init_toc_end[];
18
19static 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
27static 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
39static 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
50static 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
56static 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
69static 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 */