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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6595 | serge | 1 | /* |
| 2 | * acpi_tables.c - ACPI Boot-Time Table Parsing |
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| 3 | * |
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| 4 | * Copyright (C) 2001 Paul Diefenbaugh |
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| 5 | * |
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| 6 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 7 | * |
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| 8 | * This program is free software; you can redistribute it and/or modify |
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| 9 | * it under the terms of the GNU General Public License as published by |
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| 10 | * the Free Software Foundation; either version 2 of the License, or |
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| 11 | * (at your option) any later version. |
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| 12 | * |
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| 13 | * This program is distributed in the hope that it will be useful, |
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| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 16 | * GNU General Public License for more details. |
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| 17 | * |
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| 18 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 19 | * |
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| 20 | */ |
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| 21 | |||
| 22 | /* Uncomment next line to get verbose printout */ |
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| 23 | /* #define DEBUG */ |
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| 24 | #define pr_fmt(fmt) "ACPI: " fmt |
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| 25 | |||
| 26 | #include |
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| 27 | #include |
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| 28 | #include |
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| 29 | #include |
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| 30 | #include |
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| 31 | #include |
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| 32 | |||
| 33 | #define ACPI_MAX_TABLES 128 |
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| 34 | static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata; |
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| 35 | |||
| 36 | static int acpi_apic_instance __initdata; |
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| 37 | |||
| 38 | /* |
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| 39 | * Disable table checksum verification for the early stage due to the size |
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| 40 | * limitation of the current x86 early mapping implementation. |
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| 41 | */ |
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| 42 | static bool acpi_verify_table_checksum __initdata = false; |
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| 43 | /** |
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| 44 | * acpi_table_parse - find table with @id, run @handler on it |
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| 45 | * @id: table id to find |
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| 46 | * @handler: handler to run |
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| 47 | * |
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| 48 | * Scan the ACPI System Descriptor Table (STD) for a table matching @id, |
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| 49 | * run @handler on it. |
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| 50 | * |
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| 51 | * Return 0 if table found, -errno if not. |
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| 52 | */ |
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| 53 | int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler) |
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| 54 | { |
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| 55 | struct acpi_table_header *table = NULL; |
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| 56 | acpi_size tbl_size; |
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| 57 | |||
| 58 | if (acpi_disabled) |
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| 59 | return -ENODEV; |
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| 60 | |||
| 61 | if (!id || !handler) |
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| 62 | return -EINVAL; |
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| 63 | |||
| 64 | if (strncmp(id, ACPI_SIG_MADT, 4) == 0) |
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| 65 | acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size); |
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| 66 | else |
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| 67 | acpi_get_table_with_size(id, 0, &table, &tbl_size); |
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| 68 | |||
| 69 | if (table) { |
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| 70 | handler(table); |
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| 71 | early_acpi_os_unmap_memory(table, tbl_size); |
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| 72 | return 0; |
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| 73 | } else |
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| 74 | return -ENODEV; |
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| 75 | } |
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| 76 | |||
| 77 | /* |
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| 78 | * acpi_table_init() |
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| 79 | * |
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| 80 | * find RSDP, find and checksum SDT/XSDT. |
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| 81 | * checksum all tables, print SDT/XSDT |
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| 82 | * |
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| 83 | * result: sdt_entry[] is initialized |
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| 84 | */ |
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| 85 | |||
| 86 | int __init acpi_table_init(void) |
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| 87 | { |
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| 88 | acpi_status status; |
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| 89 | |||
| 90 | if (acpi_verify_table_checksum) { |
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| 91 | pr_info("Early table checksum verification enabled\n"); |
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| 92 | acpi_gbl_verify_table_checksum = TRUE; |
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| 93 | } else { |
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| 94 | pr_info("Early table checksum verification disabled\n"); |
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| 95 | acpi_gbl_verify_table_checksum = FALSE; |
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| 96 | } |
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| 97 | |||
| 98 | status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0); |
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| 99 | if (ACPI_FAILURE(status)) |
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| 100 | return -EINVAL; |
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| 101 | |||
| 102 | return 0; |
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| 103 | } |