Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_POWERPC_SECTIONS_H
3#define _ASM_POWERPC_SECTIONS_H
4#ifdef __KERNEL__
5
6#include <linux/elf.h>
7#include <linux/uaccess.h>
8
9#define arch_is_kernel_initmem_freed arch_is_kernel_initmem_freed
10
11#include <asm-generic/sections.h>
12
13extern bool init_mem_is_free;
14
15static inline int arch_is_kernel_initmem_freed(unsigned long addr)
16{
17 if (!init_mem_is_free)
18 return 0;
19
20 return addr >= (unsigned long)__init_begin &&
21 addr < (unsigned long)__init_end;
22}
23
24extern char __head_end[];
25
26#ifdef __powerpc64__
27
28extern char __start_interrupts[];
29extern char __end_interrupts[];
30
31extern char __prom_init_toc_start[];
32extern char __prom_init_toc_end[];
33
34#ifdef CONFIG_PPC_POWERNV
35extern char start_real_trampolines[];
36extern char end_real_trampolines[];
37extern char start_virt_trampolines[];
38extern char end_virt_trampolines[];
39#endif
40
41static inline unsigned long kernel_toc_addr(void)
42{
43 /* Defined by the linker, see vmlinux.lds.S */
44 extern unsigned long __toc_start;
45
46 /*
47 * The TOC register (r2) points 32kB into the TOC, so that 64kB of
48 * the TOC can be addressed using a single machine instruction.
49 */
50 return (unsigned long)(&__toc_start) + 0x8000UL;
51}
52
53static inline int overlaps_interrupt_vector_text(unsigned long start,
54 unsigned long end)
55{
56 unsigned long real_start, real_end;
57 real_start = __start_interrupts - _stext;
58 real_end = __end_interrupts - _stext;
59
60 return start < (unsigned long)__va(real_end) &&
61 (unsigned long)__va(real_start) < end;
62}
63
64static inline int overlaps_kernel_text(unsigned long start, unsigned long end)
65{
66 return start < (unsigned long)__init_end &&
67 (unsigned long)_stext < end;
68}
69
70#ifdef PPC64_ELF_ABI_v1
71
72#define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1
73
74#undef dereference_function_descriptor
75static inline void *dereference_function_descriptor(void *ptr)
76{
77 struct ppc64_opd_entry *desc = ptr;
78 void *p;
79
80 if (!get_kernel_nofault(p, (void *)&desc->funcaddr))
81 ptr = p;
82 return ptr;
83}
84
85#undef dereference_kernel_function_descriptor
86static inline void *dereference_kernel_function_descriptor(void *ptr)
87{
88 if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd)
89 return ptr;
90
91 return dereference_function_descriptor(ptr);
92}
93#endif /* PPC64_ELF_ABI_v1 */
94
95#endif
96
97#endif /* __KERNEL__ */
98#endif /* _ASM_POWERPC_SECTIONS_H */