1 | /** @file
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2 | * VirtualBox Additions Linux kernel video driver hgsmi interface code
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3 | */
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4 |
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5 | /*
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6 | * Contributed by Hans de Goede <hdegoede@redhat.com>
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7 | *
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8 | * Copyright (C) 2017-2019 Oracle Corporation
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9 | *
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10 | * Permission is hereby granted, free of charge, to any person
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11 | * obtaining a copy of this software and associated documentation
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12 | * files (the "Software"), to deal in the Software without
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13 | * restriction, including without limitation the rights to use,
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14 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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15 | * copies of the Software, and to permit persons to whom the
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16 | * Software is furnished to do so, subject to the following
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17 | * conditions:
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18 | *
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19 | * The above copyright notice and this permission notice shall be
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20 | * included in all copies or substantial portions of the Software.
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21 | *
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22 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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23 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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24 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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25 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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26 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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27 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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28 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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29 | * OTHER DEALINGS IN THE SOFTWARE.
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30 | */
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31 |
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32 | #include <HGSMIBase.h>
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33 | #include <VBoxVideoVBE.h>
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34 |
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35 | /* One-at-a-Time Hash from http://www.burtleburtle.net/bob/hash/doobs.html */
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36 | static u32 hgsmi_hash_process(u32 hash, const u8 *data, int size)
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37 | {
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38 | while (size--) {
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39 | hash += *data++;
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40 | hash += (hash << 10);
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41 | hash ^= (hash >> 6);
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42 | }
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43 |
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44 | return hash;
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45 | }
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46 |
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47 | static u32 hgsmi_hash_end(u32 hash)
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48 | {
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49 | hash += (hash << 3);
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50 | hash ^= (hash >> 11);
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51 | hash += (hash << 15);
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52 |
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53 | return hash;
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54 | }
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55 |
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56 | /* Not really a checksum but that is the naming used in all vbox code */
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57 | static u32 hgsmi_checksum(u32 offset,
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58 | const HGSMIBUFFERHEADER *header,
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59 | const HGSMIBUFFERTAIL *tail)
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60 | {
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61 | u32 checksum;
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62 |
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63 | checksum = hgsmi_hash_process(0, (u8 *)&offset, sizeof(offset));
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64 | checksum = hgsmi_hash_process(checksum, (u8 *)header, sizeof(*header));
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65 | /* 4 -> Do not checksum the checksum itself */
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66 | checksum = hgsmi_hash_process(checksum, (u8 *)tail, 4);
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67 |
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68 | return hgsmi_hash_end(checksum);
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69 | }
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70 |
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71 | #if LINUX_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
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72 | void *gen_pool_dma_alloc(struct gen_pool *pool, size_t size, dma_addr_t *dma)
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73 | {
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74 | unsigned long vaddr = gen_pool_alloc(pool, size);
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75 |
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76 | if (vaddr)
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77 | *dma = gen_pool_virt_to_phys(pool, vaddr);
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78 | return (void *)vaddr;
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79 | }
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80 | #endif
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81 |
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82 | void *hgsmi_buffer_alloc(struct gen_pool *guest_pool, size_t size,
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83 | u8 channel, u16 channel_info)
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84 | {
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85 | HGSMIBUFFERHEADER *h;
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86 | HGSMIBUFFERTAIL *t;
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87 | size_t total_size;
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88 | dma_addr_t offset;
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89 |
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90 | total_size = size + sizeof(*h) + sizeof(*t);
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91 | h = gen_pool_dma_alloc(guest_pool, total_size, &offset);
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92 | if (!h)
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93 | return NULL;
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94 |
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95 | t = (HGSMIBUFFERTAIL *)((u8 *)h + sizeof(*h) + size);
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96 |
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97 | h->u8Flags = HGSMI_BUFFER_HEADER_F_SEQ_SINGLE;
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98 | h->u32DataSize = size;
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99 | h->u8Channel = channel;
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100 | h->u16ChannelInfo = channel_info;
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101 | memset(&h->u.au8Union, 0, sizeof(h->u.au8Union));
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102 |
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103 | t->u32Reserved = 0;
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104 | t->u32Checksum = hgsmi_checksum(offset, h, t);
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105 |
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106 | return (u8 *)h + sizeof(*h);
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107 | }
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108 |
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109 | void hgsmi_buffer_free(struct gen_pool *guest_pool, void *buf)
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110 | {
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111 | HGSMIBUFFERHEADER *h =
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112 | (HGSMIBUFFERHEADER *)((u8 *)buf - sizeof(*h));
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113 | size_t total_size = h->u32DataSize + sizeof(*h) +
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114 | sizeof(HGSMIBUFFERTAIL);
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115 |
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116 | gen_pool_free(guest_pool, (unsigned long)h, total_size);
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117 | }
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118 |
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119 | int hgsmi_buffer_submit(struct gen_pool *guest_pool, void *buf)
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120 | {
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121 | phys_addr_t offset;
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122 |
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123 | offset = gen_pool_virt_to_phys(guest_pool, (unsigned long)buf -
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124 | sizeof(HGSMIBUFFERHEADER));
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125 | outl(offset, VGA_PORT_HGSMI_GUEST);
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126 | /* Make the compiler aware that the host has changed memory. */
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127 | mb();
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128 |
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129 | return 0;
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130 | }
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