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c52d0d30 | 1 | /* |
ebb5e78c AS |
2 | * Copyright (C) 2015 Imagination Technologies |
3 | * Author: Alex Smith <alex.smith@imgtec.com> | |
c52d0d30 | 4 | * |
ebb5e78c AS |
5 | * This program is free software; you can redistribute it and/or modify it |
6 | * under the terms of the GNU General Public License as published by the | |
7 | * Free Software Foundation; either version 2 of the License, or (at your | |
8 | * option) any later version. | |
c52d0d30 DD |
9 | */ |
10 | ||
c52d0d30 DD |
11 | #include <linux/binfmts.h> |
12 | #include <linux/elf.h> | |
ebb5e78c AS |
13 | #include <linux/err.h> |
14 | #include <linux/init.h> | |
a7f4df4e | 15 | #include <linux/ioport.h> |
bc05830c | 16 | #include <linux/kernel.h> |
ebb5e78c AS |
17 | #include <linux/mm.h> |
18 | #include <linux/sched.h> | |
19 | #include <linux/slab.h> | |
a7f4df4e | 20 | #include <linux/timekeeper_internal.h> |
c52d0d30 | 21 | |
ebb5e78c | 22 | #include <asm/abi.h> |
00578cd8 | 23 | #include <asm/mips-cps.h> |
bc05830c | 24 | #include <asm/page.h> |
c52d0d30 | 25 | #include <asm/vdso.h> |
ebb5e78c AS |
26 | |
27 | /* Kernel-provided data used by the VDSO. */ | |
28 | static union mips_vdso_data vdso_data __page_aligned_data; | |
c52d0d30 DD |
29 | |
30 | /* | |
a7f4df4e | 31 | * Mapping for the VDSO data/GIC pages. The real pages are mapped manually, as |
ebb5e78c AS |
32 | * what we map and where within the area they are mapped is determined at |
33 | * runtime. | |
c52d0d30 | 34 | */ |
ebb5e78c AS |
35 | static struct page *no_pages[] = { NULL }; |
36 | static struct vm_special_mapping vdso_vvar_mapping = { | |
37 | .name = "[vvar]", | |
38 | .pages = no_pages, | |
39 | }; | |
c52d0d30 | 40 | |
ebb5e78c | 41 | static void __init init_vdso_image(struct mips_vdso_image *image) |
c52d0d30 | 42 | { |
ebb5e78c | 43 | unsigned long num_pages, i; |
554af0c3 | 44 | unsigned long data_pfn; |
ebb5e78c AS |
45 | |
46 | BUG_ON(!PAGE_ALIGNED(image->data)); | |
47 | BUG_ON(!PAGE_ALIGNED(image->size)); | |
48 | ||
49 | num_pages = image->size / PAGE_SIZE; | |
50 | ||
554af0c3 JH |
51 | data_pfn = __phys_to_pfn(__pa_symbol(image->data)); |
52 | for (i = 0; i < num_pages; i++) | |
53 | image->mapping.pages[i] = pfn_to_page(data_pfn + i); | |
c52d0d30 DD |
54 | } |
55 | ||
56 | static int __init init_vdso(void) | |
57 | { | |
ebb5e78c AS |
58 | init_vdso_image(&vdso_image); |
59 | ||
60 | #ifdef CONFIG_MIPS32_O32 | |
61 | init_vdso_image(&vdso_image_o32); | |
c52d0d30 DD |
62 | #endif |
63 | ||
ebb5e78c AS |
64 | #ifdef CONFIG_MIPS32_N32 |
65 | init_vdso_image(&vdso_image_n32); | |
66 | #endif | |
c52d0d30 | 67 | |
c52d0d30 DD |
68 | return 0; |
69 | } | |
1ed84537 | 70 | subsys_initcall(init_vdso); |
c52d0d30 | 71 | |
a7f4df4e AS |
72 | void update_vsyscall(struct timekeeper *tk) |
73 | { | |
74 | vdso_data_write_begin(&vdso_data); | |
75 | ||
76 | vdso_data.xtime_sec = tk->xtime_sec; | |
77 | vdso_data.xtime_nsec = tk->tkr_mono.xtime_nsec; | |
78 | vdso_data.wall_to_mono_sec = tk->wall_to_monotonic.tv_sec; | |
79 | vdso_data.wall_to_mono_nsec = tk->wall_to_monotonic.tv_nsec; | |
80 | vdso_data.cs_shift = tk->tkr_mono.shift; | |
81 | ||
82 | vdso_data.clock_mode = tk->tkr_mono.clock->archdata.vdso_clock_mode; | |
83 | if (vdso_data.clock_mode != VDSO_CLOCK_NONE) { | |
84 | vdso_data.cs_mult = tk->tkr_mono.mult; | |
85 | vdso_data.cs_cycle_last = tk->tkr_mono.cycle_last; | |
86 | vdso_data.cs_mask = tk->tkr_mono.mask; | |
87 | } | |
88 | ||
89 | vdso_data_write_end(&vdso_data); | |
90 | } | |
91 | ||
92 | void update_vsyscall_tz(void) | |
93 | { | |
94 | if (vdso_data.clock_mode != VDSO_CLOCK_NONE) { | |
95 | vdso_data.tz_minuteswest = sys_tz.tz_minuteswest; | |
96 | vdso_data.tz_dsttime = sys_tz.tz_dsttime; | |
97 | } | |
98 | } | |
99 | ||
c52d0d30 DD |
100 | int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp) |
101 | { | |
ebb5e78c | 102 | struct mips_vdso_image *image = current->thread.abi->vdso; |
c52d0d30 | 103 | struct mm_struct *mm = current->mm; |
00578cd8 | 104 | unsigned long gic_size, vvar_size, size, base, data_addr, vdso_addr, gic_pfn; |
ebb5e78c AS |
105 | struct vm_area_struct *vma; |
106 | int ret; | |
c52d0d30 | 107 | |
69048176 MH |
108 | if (down_write_killable(&mm->mmap_sem)) |
109 | return -EINTR; | |
c52d0d30 | 110 | |
432c6bac PB |
111 | /* Map delay slot emulation page */ |
112 | base = mmap_region(NULL, STACK_TOP, PAGE_SIZE, | |
113 | VM_READ|VM_WRITE|VM_EXEC| | |
114 | VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC, | |
897ab3e0 | 115 | 0, NULL); |
432c6bac PB |
116 | if (IS_ERR_VALUE(base)) { |
117 | ret = base; | |
118 | goto out; | |
119 | } | |
120 | ||
a7f4df4e AS |
121 | /* |
122 | * Determine total area size. This includes the VDSO data itself, the | |
123 | * data page, and the GIC user page if present. Always create a mapping | |
124 | * for the GIC user area if the GIC is present regardless of whether it | |
125 | * is the current clocksource, in case it comes into use later on. We | |
126 | * only map a page even though the total area is 64K, as we only need | |
127 | * the counter registers at the start. | |
128 | */ | |
00578cd8 | 129 | gic_size = mips_gic_present() ? PAGE_SIZE : 0; |
a7f4df4e AS |
130 | vvar_size = gic_size + PAGE_SIZE; |
131 | size = vvar_size + image->size; | |
132 | ||
bc05830c PB |
133 | /* |
134 | * Find a region that's large enough for us to perform the | |
135 | * colour-matching alignment below. | |
136 | */ | |
137 | if (cpu_has_dc_aliases) | |
138 | size += shm_align_mask + 1; | |
139 | ||
a7f4df4e | 140 | base = get_unmapped_area(NULL, 0, size, 0, 0); |
ebb5e78c AS |
141 | if (IS_ERR_VALUE(base)) { |
142 | ret = base; | |
143 | goto out; | |
c52d0d30 DD |
144 | } |
145 | ||
bc05830c PB |
146 | /* |
147 | * If we suffer from dcache aliasing, ensure that the VDSO data page | |
148 | * mapping is coloured the same as the kernel's mapping of that memory. | |
149 | * This ensures that when the kernel updates the VDSO data userland | |
150 | * will observe it without requiring cache invalidations. | |
151 | */ | |
152 | if (cpu_has_dc_aliases) { | |
153 | base = __ALIGN_MASK(base, shm_align_mask); | |
154 | base += ((unsigned long)&vdso_data - gic_size) & shm_align_mask; | |
155 | } | |
156 | ||
a7f4df4e AS |
157 | data_addr = base + gic_size; |
158 | vdso_addr = data_addr + PAGE_SIZE; | |
ebb5e78c | 159 | |
a7f4df4e | 160 | vma = _install_special_mapping(mm, base, vvar_size, |
ebb5e78c AS |
161 | VM_READ | VM_MAYREAD, |
162 | &vdso_vvar_mapping); | |
163 | if (IS_ERR(vma)) { | |
164 | ret = PTR_ERR(vma); | |
165 | goto out; | |
166 | } | |
c52d0d30 | 167 | |
a7f4df4e AS |
168 | /* Map GIC user page. */ |
169 | if (gic_size) { | |
00578cd8 | 170 | gic_pfn = virt_to_phys(mips_gic_base + MIPS_GIC_USER_OFS) >> PAGE_SHIFT; |
a7f4df4e | 171 | |
00578cd8 | 172 | ret = io_remap_pfn_range(vma, base, gic_pfn, gic_size, |
a7f4df4e AS |
173 | pgprot_noncached(PAGE_READONLY)); |
174 | if (ret) | |
175 | goto out; | |
176 | } | |
177 | ||
ebb5e78c | 178 | /* Map data page. */ |
a7f4df4e | 179 | ret = remap_pfn_range(vma, data_addr, |
ebb5e78c AS |
180 | virt_to_phys(&vdso_data) >> PAGE_SHIFT, |
181 | PAGE_SIZE, PAGE_READONLY); | |
c52d0d30 | 182 | if (ret) |
ebb5e78c AS |
183 | goto out; |
184 | ||
185 | /* Map VDSO image. */ | |
186 | vma = _install_special_mapping(mm, vdso_addr, image->size, | |
187 | VM_READ | VM_EXEC | | |
188 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC, | |
189 | &image->mapping); | |
190 | if (IS_ERR(vma)) { | |
191 | ret = PTR_ERR(vma); | |
192 | goto out; | |
193 | } | |
c52d0d30 | 194 | |
ebb5e78c AS |
195 | mm->context.vdso = (void *)vdso_addr; |
196 | ret = 0; | |
c52d0d30 | 197 | |
ebb5e78c | 198 | out: |
c52d0d30 DD |
199 | up_write(&mm->mmap_sem); |
200 | return ret; | |
201 | } |