/******************************************************************************* * * 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
#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;
/* 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);
}
/* * 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:
/******************************************************************************* * * 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) *
******************************************************************************/
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) *
******************************************************************************/
/* * 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;
*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) *
******************************************************************************/
#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) *
******************************************************************************/
/******************************************************************************* * * 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) *
******************************************************************************/
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