| 1 | /*
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| 2 | * Copyright (c) 2005 Jakub Jermar
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup kernel_genarch
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | /**
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| 34 | * @file
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| 35 | * @brief Advanced Configuration and Power Interface (ACPI) initialization.
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| 36 | */
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| 37 |
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| 38 | #include <genarch/acpi/acpi.h>
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| 39 | #include <genarch/acpi/madt.h>
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| 40 | #include <arch/bios/bios.h>
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| 41 | #include <debug.h>
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| 42 | #include <mm/page.h>
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| 43 | #include <mm/km.h>
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| 44 | #include <log.h>
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| 45 |
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| 46 | #define RSDP_SIGNATURE "RSD PTR "
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| 47 | #define RSDP_REVISION_OFFS 15
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| 48 |
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| 49 | #define CMP_SIGNATURE(left, right) \
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| 50 | (((left)[0] == (right)[0]) && \
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| 51 | ((left)[1] == (right)[1]) && \
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| 52 | ((left)[2] == (right)[2]) && \
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| 53 | ((left)[3] == (right)[3]))
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| 54 |
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| 55 | struct acpi_rsdp *acpi_rsdp = NULL;
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| 56 | struct acpi_rsdt *acpi_rsdt = NULL;
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| 57 | struct acpi_xsdt *acpi_xsdt = NULL;
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| 58 |
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| 59 | struct acpi_signature_map signature_map[] = {
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| 60 | {
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| 61 | (uint8_t *) "APIC",
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| 62 | (void *) &acpi_madt,
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| 63 | "Multiple APIC Description Table"
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| 64 | }
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| 65 | };
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| 66 |
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| 67 | static int rsdp_check(uint8_t *_rsdp)
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| 68 | {
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| 69 | struct acpi_rsdp *rsdp = (struct acpi_rsdp *) _rsdp;
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| 70 | uint8_t sum = 0;
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| 71 | uint32_t i;
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| 72 |
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| 73 | for (i = 0; i < 20; i++)
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| 74 | sum = (uint8_t) (sum + _rsdp[i]);
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| 75 |
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| 76 | if (sum)
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| 77 | return 0; /* bad checksum */
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| 78 |
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| 79 | if (rsdp->revision == 0)
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| 80 | return 1; /* ACPI 1.0 */
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| 81 |
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| 82 | for (; i < rsdp->length; i++)
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| 83 | sum = (uint8_t) (sum + _rsdp[i]);
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| 84 |
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| 85 | return !sum;
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| 86 | }
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| 87 |
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| 88 | int acpi_sdt_check(uint8_t *sdt)
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| 89 | {
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| 90 | struct acpi_sdt_header *hdr = (struct acpi_sdt_header *) sdt;
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| 91 | uint8_t sum = 0;
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| 92 | unsigned int i;
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| 93 |
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| 94 | for (i = 0; i < hdr->length; i++)
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| 95 | sum = (uint8_t) (sum + sdt[i]);
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| 96 |
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| 97 | return !sum;
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| 98 | }
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| 99 |
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| 100 | static struct acpi_sdt_header *map_sdt(struct acpi_sdt_header *psdt)
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| 101 | {
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| 102 | struct acpi_sdt_header *vhdr;
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| 103 | struct acpi_sdt_header *vsdt;
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| 104 |
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| 105 | /* Start with mapping the header only. */
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| 106 | vhdr = (struct acpi_sdt_header *) km_map((uintptr_t) psdt,
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| 107 | sizeof(struct acpi_sdt_header), KM_NATURAL_ALIGNMENT,
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| 108 | PAGE_READ | PAGE_NOT_CACHEABLE);
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| 109 |
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| 110 | /* Now we can map the entire structure. */
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| 111 | vsdt = (struct acpi_sdt_header *) km_map((uintptr_t) psdt,
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| 112 | vhdr->length, KM_NATURAL_ALIGNMENT,
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| 113 | PAGE_WRITE | PAGE_NOT_CACHEABLE);
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| 114 |
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| 115 | // TODO: do not leak vtmp
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| 116 |
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| 117 | return vsdt;
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| 118 | }
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| 119 |
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| 120 | static void configure_via_rsdt(void)
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| 121 | {
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| 122 | size_t i;
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| 123 | size_t j;
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| 124 | size_t cnt = (acpi_rsdt->header.length - sizeof(struct acpi_sdt_header)) /
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| 125 | sizeof(uint32_t);
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| 126 |
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| 127 | for (i = 0; i < cnt; i++) {
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| 128 | for (j = 0; j < sizeof(signature_map) /
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| 129 | sizeof(struct acpi_signature_map); j++) {
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| 130 | struct acpi_sdt_header *hdr =
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| 131 | (struct acpi_sdt_header *) (sysarg_t) acpi_rsdt->entry[i];
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| 132 |
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| 133 | struct acpi_sdt_header *vhdr = map_sdt(hdr);
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| 134 | if (CMP_SIGNATURE(vhdr->signature, signature_map[j].signature)) {
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| 135 | if (!acpi_sdt_check((uint8_t *) vhdr))
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| 136 | break;
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| 137 |
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| 138 | *signature_map[j].sdt_ptr = vhdr;
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| 139 | LOG("%p: ACPI %s", *signature_map[j].sdt_ptr,
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| 140 | signature_map[j].description);
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| 141 | }
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| 142 | }
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| 143 | }
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| 144 | }
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| 145 |
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| 146 | static void configure_via_xsdt(void)
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| 147 | {
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| 148 | size_t i;
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| 149 | size_t j;
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| 150 | size_t cnt = (acpi_xsdt->header.length - sizeof(struct acpi_sdt_header)) /
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| 151 | sizeof(uint64_t);
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| 152 |
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| 153 | for (i = 0; i < cnt; i++) {
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| 154 | for (j = 0; j < sizeof(signature_map) /
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| 155 | sizeof(struct acpi_signature_map); j++) {
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| 156 | struct acpi_sdt_header *hdr =
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| 157 | (struct acpi_sdt_header *) ((uintptr_t) acpi_xsdt->entry[i]);
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| 158 |
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| 159 | struct acpi_sdt_header *vhdr = map_sdt(hdr);
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| 160 | if (CMP_SIGNATURE(vhdr->signature, signature_map[j].signature)) {
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| 161 | if (!acpi_sdt_check((uint8_t *) vhdr))
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| 162 | break;
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| 163 |
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| 164 | *signature_map[j].sdt_ptr = vhdr;
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| 165 | LOG("%p: ACPI %s", *signature_map[j].sdt_ptr,
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| 166 | signature_map[j].description);
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| 167 | }
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| 168 | }
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| 169 | }
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| 170 | }
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| 171 |
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| 172 | void acpi_init(void)
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| 173 | {
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| 174 | uint8_t *addr[2] = { NULL, (uint8_t *) PA2KA(0xe0000) };
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| 175 | unsigned int i;
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| 176 | unsigned int j;
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| 177 | unsigned int length[2] = { 1024, 128 * 1024 };
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| 178 | uint64_t *sig = (uint64_t *) RSDP_SIGNATURE;
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| 179 |
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| 180 | /*
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| 181 | * Find Root System Description Pointer
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| 182 | * 1. search first 1K of EBDA
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| 183 | * 2. search 128K starting at 0xe0000
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| 184 | */
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| 185 |
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| 186 | addr[0] = (uint8_t *) PA2KA(ebda);
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| 187 | for (i = (ebda ? 0 : 1); i < 2; i++) {
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| 188 | for (j = 0; j < length[i]; j += 16) {
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| 189 | if ((*((uint64_t *) &addr[i][j]) == *sig) &&
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| 190 | (rsdp_check(&addr[i][j]))) {
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| 191 | acpi_rsdp = (struct acpi_rsdp *) &addr[i][j];
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| 192 | goto rsdp_found;
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| 193 | }
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| 194 | }
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| 195 | }
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| 196 |
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| 197 | return;
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| 198 |
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| 199 | rsdp_found:
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| 200 | LOG("%p: ACPI Root System Description Pointer", acpi_rsdp);
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| 201 |
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| 202 | uintptr_t acpi_rsdt_p = (uintptr_t) acpi_rsdp->rsdt_address;
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| 203 | uintptr_t acpi_xsdt_p = 0;
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| 204 |
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| 205 | if (acpi_rsdp->revision)
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| 206 | acpi_xsdt_p = (uintptr_t) acpi_rsdp->xsdt_address;
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| 207 |
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| 208 | if (acpi_rsdt_p)
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| 209 | acpi_rsdt = (struct acpi_rsdt *) map_sdt(
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| 210 | (struct acpi_sdt_header *) acpi_rsdt_p);
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| 211 |
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| 212 | if (acpi_xsdt_p)
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| 213 | acpi_xsdt = (struct acpi_xsdt *) map_sdt(
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| 214 | (struct acpi_sdt_header *) acpi_xsdt_p);
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| 215 |
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| 216 | if ((acpi_rsdt) && (!acpi_sdt_check((uint8_t *) acpi_rsdt))) {
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| 217 | log(LF_ARCH, LVL_ERROR, "RSDT: bad checksum");
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| 218 | return;
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| 219 | }
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| 220 |
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| 221 | if ((acpi_xsdt) && (!acpi_sdt_check((uint8_t *) acpi_xsdt))) {
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| 222 | log(LF_ARCH, LVL_ERROR, "XSDT: bad checksum");
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| 223 | return;
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| 224 | }
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| 225 |
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| 226 | if (acpi_xsdt)
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| 227 | configure_via_xsdt();
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| 228 | else if (acpi_rsdt)
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| 229 | configure_via_rsdt();
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| 230 | }
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| 231 |
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| 232 | /** @}
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| 233 | */
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