Quelle exregion.c
Sprache: C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name : exregion - ACPI default op_region ( address space ) handlers
*
* Copyright ( C ) 2000 - 2025 , Intel Corp .
*
*****************************************************************************/
#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;
struct acpi_mem_mapping *mm = mem_info->cur_mm;
u32 length;
acpi_size 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 (!mm || (address < mm->physical_address) ||
((u64) address + length > (u64) mm->physical_address + mm->length)) {
/*
* The request cannot be resolved by the current memory mapping .
*
* Look for an existing saved mapping covering the address range
* at hand . If found , save it as the current one and carry out
* the access .
*/
for (mm = mem_info->first_mm; mm; mm = mm->next_mm) {
if (mm == mem_info->cur_mm)
continue ;
if (address < mm->physical_address)
continue ;
if ((u64) address + length >
(u64) mm->physical_address + mm->length)
continue ;
mem_info->cur_mm = mm;
goto access;
}
/* Create a new mappings list entry */
mm = ACPI_ALLOCATE_ZEROED(sizeof (*mm));
if (!mm) {
ACPI_ERROR((AE_INFO,
"Unable to save memory mapping at 0x%8.8X%8.8X, size %u" ,
ACPI_FORMAT_UINT64(address), length));
return_ACPI_STATUS(AE_NO_MEMORY);
}
/*
* 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 (map_length > ACPI_DEFAULT_PAGE_SIZE)
map_length = ACPI_DEFAULT_PAGE_SIZE;
/* Create a new mapping starting at the address given */
logical_addr_ptr = acpi_os_map_memory(address, map_length);
if (!logical_addr_ptr) {
ACPI_ERROR((AE_INFO,
"Could not map memory at 0x%8.8X%8.8X, size %u" ,
ACPI_FORMAT_UINT64(address),
(u32)map_length));
ACPI_FREE(mm);
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Save the physical address and mapping size */
mm->logical_address = logical_addr_ptr;
mm->physical_address = address;
mm->length = map_length;
/*
* Add the new entry to the mappigs list and save it as the
* current mapping .
*/
mm->next_mm = mem_info->first_mm;
mem_info->first_mm = mm;
mem_info->cur_mm = mm;
}
access:
/*
* Generate a logical pointer corresponding to the address we want to
* access
*/
logical_addr_ptr = mm->logical_address +
((u64) address - (u64) mm->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);
}
/*******************************************************************************
*
* 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);
}
#ifdef ACPI_PCI_CONFIGURED
/*******************************************************************************
*
* 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);
}
#endif
/*******************************************************************************
*
* 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);
}
#ifdef ACPI_PCI_CONFIGURED
/*******************************************************************************
*
* 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);
}
#endif
/*******************************************************************************
*
* 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)
{
struct acpi_data_table_mapping *mapping;
char *pointer;
ACPI_FUNCTION_TRACE(ex_data_table_space_handler);
mapping = (struct acpi_data_table_mapping *) region_context;
pointer = ACPI_CAST_PTR(char , mapping->pointer) +
(address - ACPI_PTR_TO_PHYSADDR(mapping->pointer));
/*
* Perform the memory read or write . The bit_width was already
* validated .
*/
switch (function) {
case ACPI_READ:
memcpy(ACPI_CAST_PTR(char , value), pointer,
ACPI_DIV_8(bit_width));
break ;
case ACPI_WRITE:
memcpy(pointer, ACPI_CAST_PTR(char , value),
ACPI_DIV_8(bit_width));
break ;
default :
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
return_ACPI_STATUS(AE_OK);
}
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*© Formatika GbR, Deutschland
2026-10-11
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