1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_SECTIONS_H
3 #define _ASM_POWERPC_SECTIONS_H
7 #include <linux/uaccess.h>
9 #define arch_is_kernel_initmem_freed arch_is_kernel_initmem_freed
11 #include <asm-generic/sections.h>
13 extern bool init_mem_is_free;
15 static inline int arch_is_kernel_initmem_freed(unsigned long addr)
17 if (!init_mem_is_free)
20 return addr >= (unsigned long)__init_begin &&
21 addr < (unsigned long)__init_end;
24 extern char __head_end[];
28 extern char __start_interrupts[];
29 extern char __end_interrupts[];
31 extern char __prom_init_toc_start[];
32 extern char __prom_init_toc_end[];
34 #ifdef CONFIG_PPC_POWERNV
35 extern char start_real_trampolines[];
36 extern char end_real_trampolines[];
37 extern char start_virt_trampolines[];
38 extern char end_virt_trampolines[];
41 static inline unsigned long kernel_toc_addr(void)
43 /* Defined by the linker, see vmlinux.lds.S */
44 extern unsigned long __toc_start;
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.
50 return (unsigned long)(&__toc_start) + 0x8000UL;
53 static inline int overlaps_interrupt_vector_text(unsigned long start,
56 unsigned long real_start, real_end;
57 real_start = __start_interrupts - _stext;
58 real_end = __end_interrupts - _stext;
60 return start < (unsigned long)__va(real_end) &&
61 (unsigned long)__va(real_start) < end;
64 static inline int overlaps_kernel_text(unsigned long start, unsigned long end)
66 return start < (unsigned long)__init_end &&
67 (unsigned long)_stext < end;
70 #ifdef PPC64_ELF_ABI_v1
72 #define HAVE_DEREFERENCE_FUNCTION_DESCRIPTOR 1
74 #undef dereference_function_descriptor
75 static inline void *dereference_function_descriptor(void *ptr)
77 struct ppc64_opd_entry *desc = ptr;
80 if (!get_kernel_nofault(p, (void *)&desc->funcaddr))
85 #undef dereference_kernel_function_descriptor
86 static inline void *dereference_kernel_function_descriptor(void *ptr)
88 if (ptr < (void *)__start_opd || ptr >= (void *)__end_opd)
91 return dereference_function_descriptor(ptr);
93 #endif /* PPC64_ELF_ABI_v1 */
97 #endif /* __KERNEL__ */
98 #endif /* _ASM_POWERPC_SECTIONS_H */