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Diffstat (limited to 'usr/src/common/acpica/tables/tbfadt.c')
| -rw-r--r-- | usr/src/common/acpica/tables/tbfadt.c | 781 |
1 files changed, 781 insertions, 0 deletions
diff --git a/usr/src/common/acpica/tables/tbfadt.c b/usr/src/common/acpica/tables/tbfadt.c new file mode 100644 index 0000000000..51eb49b42a --- /dev/null +++ b/usr/src/common/acpica/tables/tbfadt.c @@ -0,0 +1,781 @@ +/****************************************************************************** + * + * Module Name: tbfadt - FADT table utilities + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2016, Intel Corp. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions, and the following disclaimer, + * without modification. + * 2. Redistributions in binary form must reproduce at minimum a disclaimer + * substantially similar to the "NO WARRANTY" disclaimer below + * ("Disclaimer") and any redistribution must be conditioned upon + * including a substantially similar Disclaimer requirement for further + * binary redistribution. + * 3. Neither the names of the above-listed copyright holders nor the names + * of any contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * Alternatively, this software may be distributed under the terms of the + * GNU General Public License ("GPL") version 2 as published by the Free + * Software Foundation. + * + * NO WARRANTY + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING + * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGES. + */ + +#include "acpi.h" +#include "accommon.h" +#include "actables.h" + +#define _COMPONENT ACPI_TABLES + ACPI_MODULE_NAME ("tbfadt") + +/* Local prototypes */ + +static void +AcpiTbInitGenericAddress ( + ACPI_GENERIC_ADDRESS *GenericAddress, + UINT8 SpaceId, + UINT8 ByteWidth, + UINT64 Address, + const char *RegisterName, + UINT8 Flags); + +static void +AcpiTbConvertFadt ( + void); + +static void +AcpiTbSetupFadtRegisters ( + void); + +static UINT64 +AcpiTbSelectAddress ( + char *RegisterName, + UINT32 Address32, + UINT64 Address64); + + +/* Table for conversion of FADT to common internal format and FADT validation */ + +typedef struct acpi_fadt_info +{ + const char *Name; + UINT16 Address64; + UINT16 Address32; + UINT16 Length; + UINT8 DefaultLength; + UINT8 Flags; + +} ACPI_FADT_INFO; + +#define ACPI_FADT_OPTIONAL 0 +#define ACPI_FADT_REQUIRED 1 +#define ACPI_FADT_SEPARATE_LENGTH 2 +#define ACPI_FADT_GPE_REGISTER 4 + +static ACPI_FADT_INFO FadtInfoTable[] = +{ + {"Pm1aEventBlock", + ACPI_FADT_OFFSET (XPm1aEventBlock), + ACPI_FADT_OFFSET (Pm1aEventBlock), + ACPI_FADT_OFFSET (Pm1EventLength), + ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */ + ACPI_FADT_REQUIRED}, + + {"Pm1bEventBlock", + ACPI_FADT_OFFSET (XPm1bEventBlock), + ACPI_FADT_OFFSET (Pm1bEventBlock), + ACPI_FADT_OFFSET (Pm1EventLength), + ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */ + ACPI_FADT_OPTIONAL}, + + {"Pm1aControlBlock", + ACPI_FADT_OFFSET (XPm1aControlBlock), + ACPI_FADT_OFFSET (Pm1aControlBlock), + ACPI_FADT_OFFSET (Pm1ControlLength), + ACPI_PM1_REGISTER_WIDTH, + ACPI_FADT_REQUIRED}, + + {"Pm1bControlBlock", + ACPI_FADT_OFFSET (XPm1bControlBlock), + ACPI_FADT_OFFSET (Pm1bControlBlock), + ACPI_FADT_OFFSET (Pm1ControlLength), + ACPI_PM1_REGISTER_WIDTH, + ACPI_FADT_OPTIONAL}, + + {"Pm2ControlBlock", + ACPI_FADT_OFFSET (XPm2ControlBlock), + ACPI_FADT_OFFSET (Pm2ControlBlock), + ACPI_FADT_OFFSET (Pm2ControlLength), + ACPI_PM2_REGISTER_WIDTH, + ACPI_FADT_SEPARATE_LENGTH}, + + {"PmTimerBlock", + ACPI_FADT_OFFSET (XPmTimerBlock), + ACPI_FADT_OFFSET (PmTimerBlock), + ACPI_FADT_OFFSET (PmTimerLength), + ACPI_PM_TIMER_WIDTH, + ACPI_FADT_SEPARATE_LENGTH}, /* ACPI 5.0A: Timer is optional */ + + {"Gpe0Block", + ACPI_FADT_OFFSET (XGpe0Block), + ACPI_FADT_OFFSET (Gpe0Block), + ACPI_FADT_OFFSET (Gpe0BlockLength), + 0, + ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER}, + + {"Gpe1Block", + ACPI_FADT_OFFSET (XGpe1Block), + ACPI_FADT_OFFSET (Gpe1Block), + ACPI_FADT_OFFSET (Gpe1BlockLength), + 0, + ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER} +}; + +#define ACPI_FADT_INFO_ENTRIES \ + (sizeof (FadtInfoTable) / sizeof (ACPI_FADT_INFO)) + + +/* Table used to split Event Blocks into separate status/enable registers */ + +typedef struct acpi_fadt_pm_info +{ + ACPI_GENERIC_ADDRESS *Target; + UINT16 Source; + UINT8 RegisterNum; + +} ACPI_FADT_PM_INFO; + +static ACPI_FADT_PM_INFO FadtPmInfoTable[] = +{ + {&AcpiGbl_XPm1aStatus, + ACPI_FADT_OFFSET (XPm1aEventBlock), + 0}, + + {&AcpiGbl_XPm1aEnable, + ACPI_FADT_OFFSET (XPm1aEventBlock), + 1}, + + {&AcpiGbl_XPm1bStatus, + ACPI_FADT_OFFSET (XPm1bEventBlock), + 0}, + + {&AcpiGbl_XPm1bEnable, + ACPI_FADT_OFFSET (XPm1bEventBlock), + 1} +}; + +#define ACPI_FADT_PM_INFO_ENTRIES \ + (sizeof (FadtPmInfoTable) / sizeof (ACPI_FADT_PM_INFO)) + + +/******************************************************************************* + * + * FUNCTION: AcpiTbInitGenericAddress + * + * PARAMETERS: GenericAddress - GAS struct to be initialized + * SpaceId - ACPI Space ID for this register + * ByteWidth - Width of this register + * Address - Address of the register + * RegisterName - ASCII name of the ACPI register + * + * RETURN: None + * + * DESCRIPTION: Initialize a Generic Address Structure (GAS) + * See the ACPI specification for a full description and + * definition of this structure. + * + ******************************************************************************/ + +static void +AcpiTbInitGenericAddress ( + ACPI_GENERIC_ADDRESS *GenericAddress, + UINT8 SpaceId, + UINT8 ByteWidth, + UINT64 Address, + const char *RegisterName, + UINT8 Flags) +{ + UINT8 BitWidth; + + + /* + * Bit width field in the GAS is only one byte long, 255 max. + * Check for BitWidth overflow in GAS. + */ + BitWidth = (UINT8) (ByteWidth * 8); + if (ByteWidth > 31) /* (31*8)=248, (32*8)=256 */ + { + /* + * No error for GPE blocks, because we do not use the BitWidth + * for GPEs, the legacy length (ByteWidth) is used instead to + * allow for a large number of GPEs. + */ + if (!(Flags & ACPI_FADT_GPE_REGISTER)) + { + ACPI_ERROR ((AE_INFO, + "%s - 32-bit FADT register is too long (%u bytes, %u bits) " + "to convert to GAS struct - 255 bits max, truncating", + RegisterName, ByteWidth, (ByteWidth * 8))); + } + + BitWidth = 255; + } + + /* + * The 64-bit Address field is non-aligned in the byte packed + * GAS struct. + */ + ACPI_MOVE_64_TO_64 (&GenericAddress->Address, &Address); + + /* All other fields are byte-wide */ + + GenericAddress->SpaceId = SpaceId; + GenericAddress->BitWidth = BitWidth; + GenericAddress->BitOffset = 0; + GenericAddress->AccessWidth = 0; /* Access width ANY */ +} + + +/******************************************************************************* + * + * FUNCTION: AcpiTbSelectAddress + * + * PARAMETERS: RegisterName - ASCII name of the ACPI register + * Address32 - 32-bit address of the register + * Address64 - 64-bit address of the register + * + * RETURN: The resolved 64-bit address + * + * DESCRIPTION: Select between 32-bit and 64-bit versions of addresses within + * the FADT. Used for the FACS and DSDT addresses. + * + * NOTES: + * + * Check for FACS and DSDT address mismatches. An address mismatch between + * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and + * DSDT/X_DSDT) could be a corrupted address field or it might indicate + * the presence of two FACS or two DSDT tables. + * + * November 2013: + * By default, as per the ACPICA specification, a valid 64-bit address is + * used regardless of the value of the 32-bit address. However, this + * behavior can be overridden via the AcpiGbl_Use32BitFadtAddresses flag. + * + ******************************************************************************/ + +static UINT64 +AcpiTbSelectAddress ( + char *RegisterName, + UINT32 Address32, + UINT64 Address64) +{ + + if (!Address64) + { + /* 64-bit address is zero, use 32-bit address */ + + return ((UINT64) Address32); + } + + if (Address32 && + (Address64 != (UINT64) Address32)) + { + /* Address mismatch between 32-bit and 64-bit versions */ + + ACPI_BIOS_WARNING ((AE_INFO, + "32/64X %s address mismatch in FADT: " + "0x%8.8X/0x%8.8X%8.8X, using %u-bit address", + RegisterName, Address32, ACPI_FORMAT_UINT64 (Address64), + AcpiGbl_Use32BitFadtAddresses ? 32 : 64)); + + /* 32-bit address override */ + + if (AcpiGbl_Use32BitFadtAddresses) + { + return ((UINT64) Address32); + } + } + + /* Default is to use the 64-bit address */ + + return (Address64); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiTbParseFadt + * + * PARAMETERS: None + * + * RETURN: None + * + * DESCRIPTION: Initialize the FADT, DSDT and FACS tables + * (FADT contains the addresses of the DSDT and FACS) + * + ******************************************************************************/ + +void +AcpiTbParseFadt ( + void) +{ + UINT32 Length; + ACPI_TABLE_HEADER *Table; + + + /* + * The FADT has multiple versions with different lengths, + * and it contains pointers to both the DSDT and FACS tables. + * + * Get a local copy of the FADT and convert it to a common format + * Map entire FADT, assumed to be smaller than one page. + */ + Length = AcpiGbl_RootTableList.Tables[AcpiGbl_FadtIndex].Length; + + Table = AcpiOsMapMemory ( + AcpiGbl_RootTableList.Tables[AcpiGbl_FadtIndex].Address, Length); + if (!Table) + { + return; + } + + /* + * Validate the FADT checksum before we copy the table. Ignore + * checksum error as we want to try to get the DSDT and FACS. + */ + (void) AcpiTbVerifyChecksum (Table, Length); + + /* Create a local copy of the FADT in common ACPI 2.0+ format */ + + AcpiTbCreateLocalFadt (Table, Length); + + /* All done with the real FADT, unmap it */ + + AcpiOsUnmapMemory (Table, Length); + + /* Obtain the DSDT and FACS tables via their addresses within the FADT */ + + AcpiTbInstallFixedTable ((ACPI_PHYSICAL_ADDRESS) AcpiGbl_FADT.XDsdt, + ACPI_SIG_DSDT, &AcpiGbl_DsdtIndex); + + /* If Hardware Reduced flag is set, there is no FACS */ + + if (!AcpiGbl_ReducedHardware) + { + if (AcpiGbl_FADT.Facs) + { + AcpiTbInstallFixedTable ((ACPI_PHYSICAL_ADDRESS) AcpiGbl_FADT.Facs, + ACPI_SIG_FACS, &AcpiGbl_FacsIndex); + } + if (AcpiGbl_FADT.XFacs) + { + AcpiTbInstallFixedTable ((ACPI_PHYSICAL_ADDRESS) AcpiGbl_FADT.XFacs, + ACPI_SIG_FACS, &AcpiGbl_XFacsIndex); + } + } +} + + +/******************************************************************************* + * + * FUNCTION: AcpiTbCreateLocalFadt + * + * PARAMETERS: Table - Pointer to BIOS FADT + * Length - Length of the table + * + * RETURN: None + * + * DESCRIPTION: Get a local copy of the FADT and convert it to a common format. + * Performs validation on some important FADT fields. + * + * NOTE: We create a local copy of the FADT regardless of the version. + * + ******************************************************************************/ + +void +AcpiTbCreateLocalFadt ( + ACPI_TABLE_HEADER *Table, + UINT32 Length) +{ + + /* + * Check if the FADT is larger than the largest table that we expect + * (typically the current ACPI specification version). If so, truncate + * the table, and issue a warning. + */ + if (Length > sizeof (ACPI_TABLE_FADT)) + { + ACPI_BIOS_WARNING ((AE_INFO, + "FADT (revision %u) is longer than %s length, " + "truncating length %u to %u", + Table->Revision, ACPI_FADT_CONFORMANCE, Length, + (UINT32) sizeof (ACPI_TABLE_FADT))); + } + + /* Clear the entire local FADT */ + + memset (&AcpiGbl_FADT, 0, sizeof (ACPI_TABLE_FADT)); + + /* Copy the original FADT, up to sizeof (ACPI_TABLE_FADT) */ + + memcpy (&AcpiGbl_FADT, Table, + ACPI_MIN (Length, sizeof (ACPI_TABLE_FADT))); + + /* Take a copy of the Hardware Reduced flag */ + + AcpiGbl_ReducedHardware = FALSE; + if (AcpiGbl_FADT.Flags & ACPI_FADT_HW_REDUCED) + { + AcpiGbl_ReducedHardware = TRUE; + } + + /* Convert the local copy of the FADT to the common internal format */ + + AcpiTbConvertFadt (); + + /* Initialize the global ACPI register structures */ + + AcpiTbSetupFadtRegisters (); +} + + +/******************************************************************************* + * + * FUNCTION: AcpiTbConvertFadt + * + * PARAMETERS: None - AcpiGbl_FADT is used. + * + * RETURN: None + * + * DESCRIPTION: Converts all versions of the FADT to a common internal format. + * Expand 32-bit addresses to 64-bit as necessary. Also validate + * important fields within the FADT. + * + * NOTE: AcpiGbl_FADT must be of size (ACPI_TABLE_FADT), and must + * contain a copy of the actual BIOS-provided FADT. + * + * Notes on 64-bit register addresses: + * + * After this FADT conversion, later ACPICA code will only use the 64-bit "X" + * fields of the FADT for all ACPI register addresses. + * + * The 64-bit X fields are optional extensions to the original 32-bit FADT + * V1.0 fields. Even if they are present in the FADT, they are optional and + * are unused if the BIOS sets them to zero. Therefore, we must copy/expand + * 32-bit V1.0 fields to the 64-bit X fields if the the 64-bit X field is + * originally zero. + * + * For ACPI 1.0 FADTs (that contain no 64-bit addresses), all 32-bit address + * fields are expanded to the corresponding 64-bit X fields in the internal + * common FADT. + * + * For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded + * to the corresponding 64-bit X fields, if the 64-bit field is originally + * zero. Adhering to the ACPI specification, we completely ignore the 32-bit + * field if the 64-bit field is valid, regardless of whether the host OS is + * 32-bit or 64-bit. + * + * Possible additional checks: + * (AcpiGbl_FADT.Pm1EventLength >= 4) + * (AcpiGbl_FADT.Pm1ControlLength >= 2) + * (AcpiGbl_FADT.PmTimerLength >= 4) + * Gpe block lengths must be multiple of 2 + * + ******************************************************************************/ + +static void +AcpiTbConvertFadt ( + void) +{ + const char *Name; + ACPI_GENERIC_ADDRESS *Address64; + UINT32 Address32; + UINT8 Length; + UINT8 Flags; + UINT32 i; + + + /* + * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which + * should be zero are indeed zero. This will workaround BIOSs that + * inadvertently place values in these fields. + * + * The ACPI 1.0 reserved fields that will be zeroed are the bytes located + * at offset 45, 55, 95, and the word located at offset 109, 110. + * + * Note: The FADT revision value is unreliable. Only the length can be + * trusted. + */ + if (AcpiGbl_FADT.Header.Length <= ACPI_FADT_V2_SIZE) + { + AcpiGbl_FADT.PreferredProfile = 0; + AcpiGbl_FADT.PstateControl = 0; + AcpiGbl_FADT.CstControl = 0; + AcpiGbl_FADT.BootFlags = 0; + } + + /* + * Now we can update the local FADT length to the length of the + * current FADT version as defined by the ACPI specification. + * Thus, we will have a common FADT internally. + */ + AcpiGbl_FADT.Header.Length = sizeof (ACPI_TABLE_FADT); + + /* + * Expand the 32-bit DSDT addresses to 64-bit as necessary. + * Later ACPICA code will always use the X 64-bit field. + */ + AcpiGbl_FADT.XDsdt = AcpiTbSelectAddress ("DSDT", + AcpiGbl_FADT.Dsdt, AcpiGbl_FADT.XDsdt); + + /* If Hardware Reduced flag is set, we are all done */ + + if (AcpiGbl_ReducedHardware) + { + return; + } + + /* Examine all of the 64-bit extended address fields (X fields) */ + + for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) + { + /* + * Get the 32-bit and 64-bit addresses, as well as the register + * length and register name. + */ + Address32 = *ACPI_ADD_PTR (UINT32, + &AcpiGbl_FADT, FadtInfoTable[i].Address32); + + Address64 = ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS, + &AcpiGbl_FADT, FadtInfoTable[i].Address64); + + Length = *ACPI_ADD_PTR (UINT8, + &AcpiGbl_FADT, FadtInfoTable[i].Length); + + Name = FadtInfoTable[i].Name; + Flags = FadtInfoTable[i].Flags; + + /* + * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X" + * generic address structures as necessary. Later code will always use + * the 64-bit address structures. + * + * November 2013: + * Now always use the 64-bit address if it is valid (non-zero), in + * accordance with the ACPI specification which states that a 64-bit + * address supersedes the 32-bit version. This behavior can be + * overridden by the AcpiGbl_Use32BitFadtAddresses flag. + * + * During 64-bit address construction and verification, + * these cases are handled: + * + * Address32 zero, Address64 [don't care] - Use Address64 + * + * Address32 non-zero, Address64 zero - Copy/use Address32 + * Address32 non-zero == Address64 non-zero - Use Address64 + * Address32 non-zero != Address64 non-zero - Warning, use Address64 + * + * Override: if AcpiGbl_Use32BitFadtAddresses is TRUE, and: + * Address32 non-zero != Address64 non-zero - Warning, copy/use Address32 + * + * Note: SpaceId is always I/O for 32-bit legacy address fields + */ + if (Address32) + { + if (!Address64->Address) + { + /* 64-bit address is zero, use 32-bit address */ + + AcpiTbInitGenericAddress (Address64, + ACPI_ADR_SPACE_SYSTEM_IO, + *ACPI_ADD_PTR (UINT8, &AcpiGbl_FADT, + FadtInfoTable[i].Length), + (UINT64) Address32, Name, Flags); + } + else if (Address64->Address != (UINT64) Address32) + { + /* Address mismatch */ + + ACPI_BIOS_WARNING ((AE_INFO, + "32/64X address mismatch in FADT/%s: " + "0x%8.8X/0x%8.8X%8.8X, using %u-bit address", + Name, Address32, + ACPI_FORMAT_UINT64 (Address64->Address), + AcpiGbl_Use32BitFadtAddresses ? 32 : 64)); + + if (AcpiGbl_Use32BitFadtAddresses) + { + /* 32-bit address override */ + + AcpiTbInitGenericAddress (Address64, + ACPI_ADR_SPACE_SYSTEM_IO, + *ACPI_ADD_PTR (UINT8, &AcpiGbl_FADT, + FadtInfoTable[i].Length), + (UINT64) Address32, Name, Flags); + } + } + } + + /* + * For each extended field, check for length mismatch between the + * legacy length field and the corresponding 64-bit X length field. + * Note: If the legacy length field is > 0xFF bits, ignore this + * check. (GPE registers can be larger than the 64-bit GAS structure + * can accomodate, 0xFF bits). + */ + if (Address64->Address && + (ACPI_MUL_8 (Length) <= ACPI_UINT8_MAX) && + (Address64->BitWidth != ACPI_MUL_8 (Length))) + { + ACPI_BIOS_WARNING ((AE_INFO, + "32/64X length mismatch in FADT/%s: %u/%u", + Name, ACPI_MUL_8 (Length), Address64->BitWidth)); + } + + if (FadtInfoTable[i].Flags & ACPI_FADT_REQUIRED) + { + /* + * Field is required (PM1aEvent, PM1aControl). + * Both the address and length must be non-zero. + */ + if (!Address64->Address || !Length) + { + ACPI_BIOS_ERROR ((AE_INFO, + "Required FADT field %s has zero address and/or length: " + "0x%8.8X%8.8X/0x%X", + Name, ACPI_FORMAT_UINT64 (Address64->Address), Length)); + } + } + else if (FadtInfoTable[i].Flags & ACPI_FADT_SEPARATE_LENGTH) + { + /* + * Field is optional (PM2Control, GPE0, GPE1) AND has its own + * length field. If present, both the address and length must + * be valid. + */ + if ((Address64->Address && !Length) || + (!Address64->Address && Length)) + { + ACPI_BIOS_WARNING ((AE_INFO, + "Optional FADT field %s has valid %s but zero %s: " + "0x%8.8X%8.8X/0x%X", Name, + (Length ? "Length" : "Address"), + (Length ? "Address": "Length"), + ACPI_FORMAT_UINT64 (Address64->Address), Length)); + } + } + } +} + + +/******************************************************************************* + * + * FUNCTION: AcpiTbSetupFadtRegisters + * + * PARAMETERS: None, uses AcpiGbl_FADT. + * + * RETURN: None + * + * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally, + * force FADT register definitions to their default lengths. + * + ******************************************************************************/ + +static void +AcpiTbSetupFadtRegisters ( + void) +{ + ACPI_GENERIC_ADDRESS *Target64; + ACPI_GENERIC_ADDRESS *Source64; + UINT8 Pm1RegisterByteWidth; + UINT32 i; + + + /* + * Optionally check all register lengths against the default values and + * update them if they are incorrect. + */ + if (AcpiGbl_UseDefaultRegisterWidths) + { + for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) + { + Target64 = ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS, &AcpiGbl_FADT, + FadtInfoTable[i].Address64); + + /* + * If a valid register (Address != 0) and the (DefaultLength > 0) + * (Not a GPE register), then check the width against the default. + */ + if ((Target64->Address) && + (FadtInfoTable[i].DefaultLength > 0) && + (FadtInfoTable[i].DefaultLength != Target64->BitWidth)) + { + ACPI_BIOS_WARNING ((AE_INFO, + "Invalid length for FADT/%s: %u, using default %u", + FadtInfoTable[i].Name, Target64->BitWidth, + FadtInfoTable[i].DefaultLength)); + + /* Incorrect size, set width to the default */ + + Target64->BitWidth = FadtInfoTable[i].DefaultLength; + } + } + } + + /* + * Get the length of the individual PM1 registers (enable and status). + * Each register is defined to be (event block length / 2). Extra divide + * by 8 converts bits to bytes. + */ + Pm1RegisterByteWidth = (UINT8) + ACPI_DIV_16 (AcpiGbl_FADT.XPm1aEventBlock.BitWidth); + + /* + * Calculate separate GAS structs for the PM1x (A/B) Status and Enable + * registers. These addresses do not appear (directly) in the FADT, so it + * is useful to pre-calculate them from the PM1 Event Block definitions. + * + * The PM event blocks are split into two register blocks, first is the + * PM Status Register block, followed immediately by the PM Enable + * Register block. Each is of length (Pm1EventLength/2) + * + * Note: The PM1A event block is required by the ACPI specification. + * However, the PM1B event block is optional and is rarely, if ever, + * used. + */ + + for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++) + { + Source64 = ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS, &AcpiGbl_FADT, + FadtPmInfoTable[i].Source); + + if (Source64->Address) + { + AcpiTbInitGenericAddress (FadtPmInfoTable[i].Target, + Source64->SpaceId, Pm1RegisterByteWidth, + Source64->Address + + (FadtPmInfoTable[i].RegisterNum * Pm1RegisterByteWidth), + "PmRegisters", 0); + } + } +} |