mips/kernel/vdso.c

1 // SPDX-License-Identifier: GPL-2.0-or-later
20 #include <asm/mips-cps.h>
26 /* Kernel-provided data used by the VDSO. */
28 struct vdso_data *vdso_data = mips_vdso_data.data;
31  * Mapping for the VDSO data/GIC pages. The real pages are mapped manually, as
46 	BUG_ON(!PAGE_ALIGNED(image->data));  in init_vdso_image()
47 	BUG_ON(!PAGE_ALIGNED(image->size));  in init_vdso_image()
49 	num_pages = image->size / PAGE_SIZE;  in init_vdso_image()
51 	data_pfn = __phys_to_pfn(__pa_symbol(image->data));  in init_vdso_image()
53 		image->mapping.pages[i] = pfn_to_page(data_pfn + i);  in init_vdso_image()
81 	if (current->flags & PF_RANDOMIZE) {  in vdso_base()
82 		base += get_random_int() & (VDSO_RANDOMIZE_SIZE - 1);  in vdso_base()
91 	struct mips_vdso_image *image = current->thread.abi->vdso;  in arch_setup_additional_pages()
92 	struct mm_struct *mm = current->mm;  in arch_setup_additional_pages()
98 		return -EINTR;  in arch_setup_additional_pages()
113 	 * Determine total area size. This includes the VDSO data itself, the  in arch_setup_additional_pages()
114 	 * data page, and the GIC user page if present. Always create a mapping  in arch_setup_additional_pages()
122 	size = vvar_size + image->size;  in arch_setup_additional_pages()
126 	 * colour-matching alignment below.  in arch_setup_additional_pages()
138 	 * If we suffer from dcache aliasing, ensure that the VDSO data page  in arch_setup_additional_pages()
139 	 * mapping is coloured the same as the kernel's mapping of that memory.  in arch_setup_additional_pages()
140 	 * This ensures that when the kernel updates the VDSO data userland  in arch_setup_additional_pages()
145 		base += ((unsigned long)vdso_data - gic_size) & shm_align_mask;  in arch_setup_additional_pages()
169 	/* Map data page. */  in arch_setup_additional_pages()
177 	vma = _install_special_mapping(mm, vdso_addr, image->size,  in arch_setup_additional_pages()
180 				       &image->mapping);  in arch_setup_additional_pages()
186 	mm->context.vdso = (void *)vdso_addr;  in arch_setup_additional_pages()