cregit-Linux how code gets into the kernel

Release 4.11 drivers/acpi/acpica/exregion.c

/******************************************************************************
 *
 * Module Name: exregion - ACPI default op_region (address space) handlers
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2017, 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/acpi.h>
#include "accommon.h"
#include "acinterp.h"


#define _COMPONENT          ACPI_EXECUTER
ACPI_MODULE_NAME("exregion")

/*******************************************************************************
 *
 * FUNCTION:    acpi_ex_system_memory_space_handler
 *
 * PARAMETERS:  function            - Read or Write operation
 *              address             - Where in the space to read or write
 *              bit_width           - Field width in bits (8, 16, or 32)
 *              value               - Pointer to in or out value
 *              handler_context     - Pointer to Handler's context
 *              region_context      - Pointer to context specific to the
 *                                    accessed region
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Handler for the System Memory address space (Op Region)
 *
 ******************************************************************************/

acpi_status acpi_ex_system_memory_space_handler(u32 function, acpi_physical_address address, u32 bit_width, u64 *value, void *handler_context, void *region_context) { acpi_status status = AE_OK; void *logical_addr_ptr = NULL; struct acpi_mem_space_context *mem_info = region_context; u32 length; acpi_size map_length; acpi_size page_boundary_map_length; #ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED u32 remainder; #endif ACPI_FUNCTION_TRACE(ex_system_memory_space_handler); /* Validate and translate the bit width */ switch (bit_width) { case 8: length = 1; break; case 16: length = 2; break; case 32: length = 4; break; case 64: length = 8; break; default: ACPI_ERROR((AE_INFO, "Invalid SystemMemory width %u", bit_width)); return_ACPI_STATUS(AE_AML_OPERAND_VALUE); } #ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED /* * Hardware does not support non-aligned data transfers, we must verify * the request. */ (void)acpi_ut_short_divide((u64) address, length, NULL, &remainder); if (remainder != 0) { return_ACPI_STATUS(AE_AML_ALIGNMENT); } #endif /* * Does the request fit into the cached memory mapping? * Is 1) Address below the current mapping? OR * 2) Address beyond the current mapping? */ if ((address < mem_info->mapped_physical_address) || (((u64) address + length) > ((u64) mem_info->mapped_physical_address + mem_info->mapped_length))) { /* * The request cannot be resolved by the current memory mapping; * Delete the existing mapping and create a new one. */ if (mem_info->mapped_length) { /* Valid mapping, delete it */ acpi_os_unmap_memory(mem_info->mapped_logical_address, mem_info->mapped_length); } /* * October 2009: Attempt to map from the requested address to the * end of the region. However, we will never map more than one * page, nor will we cross a page boundary. */ map_length = (acpi_size) ((mem_info->address + mem_info->length) - address); /* * If mapping the entire remaining portion of the region will cross * a page boundary, just map up to the page boundary, do not cross. * On some systems, crossing a page boundary while mapping regions * can cause warnings if the pages have different attributes * due to resource management. * * This has the added benefit of constraining a single mapping to * one page, which is similar to the original code that used a 4k * maximum window. */ page_boundary_map_length = (acpi_size) (ACPI_ROUND_UP(address, ACPI_DEFAULT_PAGE_SIZE) - address); if (page_boundary_map_length == 0) { page_boundary_map_length = ACPI_DEFAULT_PAGE_SIZE; } if (map_length > page_boundary_map_length) { map_length = page_boundary_map_length; } /* Create a new mapping starting at the address given */ mem_info->mapped_logical_address = acpi_os_map_memory(address, map_length); if (!mem_info->mapped_logical_address) { ACPI_ERROR((AE_INFO, "Could not map memory at 0x%8.8X%8.8X, size %u", ACPI_FORMAT_UINT64(address), (u32)map_length)); mem_info->mapped_length = 0; return_ACPI_STATUS(AE_NO_MEMORY); } /* Save the physical address and mapping size */ mem_info->mapped_physical_address = address; mem_info->mapped_length = map_length; } /* * Generate a logical pointer corresponding to the address we want to * access */ logical_addr_ptr = mem_info->mapped_logical_address + ((u64) address - (u64) mem_info->mapped_physical_address); ACPI_DEBUG_PRINT((ACPI_DB_INFO, "System-Memory (width %u) R/W %u Address=%8.8X%8.8X\n", bit_width, function, ACPI_FORMAT_UINT64(address))); /* * Perform the memory read or write * * Note: For machines that do not support non-aligned transfers, the target * address was checked for alignment above. We do not attempt to break the * transfer up into smaller (byte-size) chunks because the AML specifically * asked for a transfer width that the hardware may require. */ switch (function) { case ACPI_READ: *value = 0; switch (bit_width) { case 8: *value = (u64)ACPI_GET8(logical_addr_ptr); break; case 16: *value = (u64)ACPI_GET16(logical_addr_ptr); break; case 32: *value = (u64)ACPI_GET32(logical_addr_ptr); break; case 64: *value = (u64)ACPI_GET64(logical_addr_ptr); break; default: /* bit_width was already validated */ break; } break; case ACPI_WRITE: switch (bit_width) { case 8: ACPI_SET8(logical_addr_ptr, *value); break; case 16: ACPI_SET16(logical_addr_ptr, *value); break; case 32: ACPI_SET32(logical_addr_ptr, *value); break; case 64: ACPI_SET64(logical_addr_ptr, *value); break; default: /* bit_width was already validated */ break; } break; default: status = AE_BAD_PARAMETER; break; } return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)24645.72%27.69%
Andy Grover13525.09%519.23%
Robert Moore9517.66%1246.15%
Linus Torvalds488.92%311.54%
Lv Zheng142.60%415.38%
Total538100.00%26100.00%

/******************************************************************************* * * FUNCTION: acpi_ex_system_io_space_handler * * PARAMETERS: function - Read or Write operation * address - Where in the space to read or write * bit_width - Field width in bits (8, 16, or 32) * value - Pointer to in or out value * handler_context - Pointer to Handler's context * region_context - Pointer to context specific to the * accessed region * * RETURN: Status * * DESCRIPTION: Handler for the System IO address space (Op Region) * ******************************************************************************/
acpi_status acpi_ex_system_io_space_handler(u32 function, acpi_physical_address address, u32 bit_width, u64 *value, void *handler_context, void *region_context) { acpi_status status = AE_OK; u32 value32; ACPI_FUNCTION_TRACE(ex_system_io_space_handler); ACPI_DEBUG_PRINT((ACPI_DB_INFO, "System-IO (width %u) R/W %u Address=%8.8X%8.8X\n", bit_width, function, ACPI_FORMAT_UINT64(address))); /* Decode the function parameter */ switch (function) { case ACPI_READ: status = acpi_hw_read_port((acpi_io_address)address, &value32, bit_width); *value = value32; break; case ACPI_WRITE: status = acpi_hw_write_port((acpi_io_address)address, (u32)*value, bit_width); break; default: status = AE_BAD_PARAMETER; break; } return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)6957.02%215.38%
Linus Torvalds2520.66%215.38%
Andy Grover1915.70%323.08%
Robert Moore75.79%538.46%
Lv Zheng10.83%17.69%
Total121100.00%13100.00%

/******************************************************************************* * * FUNCTION: acpi_ex_pci_config_space_handler * * PARAMETERS: function - Read or Write operation * address - Where in the space to read or write * bit_width - Field width in bits (8, 16, or 32) * value - Pointer to in or out value * handler_context - Pointer to Handler's context * region_context - Pointer to context specific to the * accessed region * * RETURN: Status * * DESCRIPTION: Handler for the PCI Config address space (Op Region) * ******************************************************************************/
acpi_status acpi_ex_pci_config_space_handler(u32 function, acpi_physical_address address, u32 bit_width, u64 *value, void *handler_context, void *region_context) { acpi_status status = AE_OK; struct acpi_pci_id *pci_id; u16 pci_register; ACPI_FUNCTION_TRACE(ex_pci_config_space_handler); /* * The arguments to acpi_os(Read|Write)pci_configuration are: * * pci_segment is the PCI bus segment range 0-31 * pci_bus is the PCI bus number range 0-255 * pci_device is the PCI device number range 0-31 * pci_function is the PCI device function number * pci_register is the Config space register range 0-255 bytes * * value - input value for write, output address for read * */ pci_id = (struct acpi_pci_id *)region_context; pci_register = (u16) (u32) address; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Pci-Config %u (%u) Seg(%04x) Bus(%04x) " "Dev(%04x) Func(%04x) Reg(%04x)\n", function, bit_width, pci_id->segment, pci_id->bus, pci_id->device, pci_id->function, pci_register)); switch (function) { case ACPI_READ: *value = 0; status = acpi_os_read_pci_configuration(pci_id, pci_register, value, bit_width); break; case ACPI_WRITE: status = acpi_os_write_pci_configuration(pci_id, pci_register, *value, bit_width); break; default: status = AE_BAD_PARAMETER; break; } return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)8052.29%214.29%
Linus Torvalds5334.64%214.29%
Andy Grover95.88%428.57%
Robert Moore63.92%535.71%
Lv Zheng53.27%17.14%
Total153100.00%14100.00%

/******************************************************************************* * * FUNCTION: acpi_ex_cmos_space_handler * * PARAMETERS: function - Read or Write operation * address - Where in the space to read or write * bit_width - Field width in bits (8, 16, or 32) * value - Pointer to in or out value * handler_context - Pointer to Handler's context * region_context - Pointer to context specific to the * accessed region * * RETURN: Status * * DESCRIPTION: Handler for the CMOS address space (Op Region) * ******************************************************************************/
acpi_status acpi_ex_cmos_space_handler(u32 function, acpi_physical_address address, u32 bit_width, u64 *value, void *handler_context, void *region_context) { acpi_status status = AE_OK; ACPI_FUNCTION_TRACE(ex_cmos_space_handler); return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds3790.24%120.00%
Robert Moore24.88%240.00%
Andy Grover24.88%240.00%
Total41100.00%5100.00%

/******************************************************************************* * * FUNCTION: acpi_ex_pci_bar_space_handler * * PARAMETERS: function - Read or Write operation * address - Where in the space to read or write * bit_width - Field width in bits (8, 16, or 32) * value - Pointer to in or out value * handler_context - Pointer to Handler's context * region_context - Pointer to context specific to the * accessed region * * RETURN: Status * * DESCRIPTION: Handler for the PCI bar_target address space (Op Region) * ******************************************************************************/
acpi_status acpi_ex_pci_bar_space_handler(u32 function, acpi_physical_address address, u32 bit_width, u64 *value, void *handler_context, void *region_context) { acpi_status status = AE_OK; ACPI_FUNCTION_TRACE(ex_pci_bar_space_handler); return_ACPI_STATUS(status); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds3790.24%120.00%
Andy Grover24.88%240.00%
Robert Moore24.88%240.00%
Total41100.00%5100.00%

/******************************************************************************* * * FUNCTION: acpi_ex_data_table_space_handler * * PARAMETERS: function - Read or Write operation * address - Where in the space to read or write * bit_width - Field width in bits (8, 16, or 32) * value - Pointer to in or out value * handler_context - Pointer to Handler's context * region_context - Pointer to context specific to the * accessed region * * RETURN: Status * * DESCRIPTION: Handler for the Data Table address space (Op Region) * ******************************************************************************/
acpi_status acpi_ex_data_table_space_handler(u32 function, acpi_physical_address address, u32 bit_width, u64 *value, void *handler_context, void *region_context) { ACPI_FUNCTION_TRACE(ex_data_table_space_handler); /* * Perform the memory read or write. The bit_width was already * validated. */ switch (function) { case ACPI_READ: memcpy(ACPI_CAST_PTR(char, value), ACPI_PHYSADDR_TO_PTR(address), ACPI_DIV_8(bit_width)); break; case ACPI_WRITE: memcpy(ACPI_PHYSADDR_TO_PTR(address), ACPI_CAST_PTR(char, value), ACPI_DIV_8(bit_width)); break; default: return_ACPI_STATUS(AE_BAD_PARAMETER); } return_ACPI_STATUS(AE_OK); }

Contributors

PersonTokensPropCommitsCommitProp
Andy Grover5455.67%337.50%
Robert Moore4344.33%562.50%
Total97100.00%8100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)40439.76%25.00%
Andy Grover22321.95%615.00%
Linus Torvalds20219.88%410.00%
Robert Moore16416.14%2152.50%
Lv Zheng201.97%512.50%
Len Brown20.20%12.50%
Patrick Mochel10.10%12.50%
Total1016100.00%40100.00%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.