2 /******************************************************************************
4 * Module Name: hwvalid - I/O request validation
6 *****************************************************************************/
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47 #include <contrib/dev/acpica/include/acpi.h>
48 #include <contrib/dev/acpica/include/accommon.h>
50 #define _COMPONENT ACPI_HARDWARE
51 ACPI_MODULE_NAME ("hwvalid")
53 /* Local prototypes */
56 AcpiHwValidateIoRequest (
57 ACPI_IO_ADDRESS Address,
62 * Protected I/O ports. Some ports are always illegal, and some are
63 * conditionally illegal. This table must remain ordered by port address.
65 * The table is used to implement the Microsoft port access rules that
66 * first appeared in Windows XP. Some ports are always illegal, and some
67 * ports are only illegal if the BIOS calls _OSI with a WinXP string or
68 * later (meaning that the BIOS itelf is post-XP.)
70 * This provides ACPICA with the desired port protections and
71 * Microsoft compatibility.
73 * Description of port entries:
75 * PIC0: Programmable Interrupt Controller (8259A)
76 * PIT1: System Timer 1
77 * PIT2: System Timer 2 failsafe
78 * RTC: Real-time clock
80 * DMA1: DMA 1 page registers
81 * DMA1L: DMA 1 Ch 0 low page
82 * DMA2: DMA 2 page registers
83 * DMA2L: DMA 2 low page refresh
84 * ARBC: Arbitration control
85 * SETUP: Reserved system board setup
86 * POS: POS channel select
89 * ELCR: PIC edge/level registers
90 * PCI: PCI configuration space
92 static const ACPI_PORT_INFO AcpiProtectedPorts[] =
94 {"DMA", 0x0000, 0x000F, ACPI_OSI_WIN_XP},
95 {"PIC0", 0x0020, 0x0021, ACPI_ALWAYS_ILLEGAL},
96 {"PIT1", 0x0040, 0x0043, ACPI_OSI_WIN_XP},
97 {"PIT2", 0x0048, 0x004B, ACPI_OSI_WIN_XP},
98 {"RTC", 0x0070, 0x0071, ACPI_OSI_WIN_XP},
99 {"CMOS", 0x0074, 0x0076, ACPI_OSI_WIN_XP},
100 {"DMA1", 0x0081, 0x0083, ACPI_OSI_WIN_XP},
101 {"DMA1L", 0x0087, 0x0087, ACPI_OSI_WIN_XP},
102 {"DMA2", 0x0089, 0x008B, ACPI_OSI_WIN_XP},
103 {"DMA2L", 0x008F, 0x008F, ACPI_OSI_WIN_XP},
104 {"ARBC", 0x0090, 0x0091, ACPI_OSI_WIN_XP},
105 {"SETUP", 0x0093, 0x0094, ACPI_OSI_WIN_XP},
106 {"POS", 0x0096, 0x0097, ACPI_OSI_WIN_XP},
107 {"PIC1", 0x00A0, 0x00A1, ACPI_ALWAYS_ILLEGAL},
108 {"IDMA", 0x00C0, 0x00DF, ACPI_OSI_WIN_XP},
109 {"ELCR", 0x04D0, 0x04D1, ACPI_ALWAYS_ILLEGAL},
110 {"PCI", 0x0CF8, 0x0CFF, ACPI_OSI_WIN_XP}
113 #define ACPI_PORT_INFO_ENTRIES ACPI_ARRAY_LENGTH (AcpiProtectedPorts)
116 /******************************************************************************
118 * FUNCTION: AcpiHwValidateIoRequest
120 * PARAMETERS: Address Address of I/O port/register
121 * BitWidth Number of bits (8,16,32)
125 * DESCRIPTION: Validates an I/O request (address/length). Certain ports are
126 * always illegal and some ports are only illegal depending on
127 * the requests the BIOS AML code makes to the predefined
130 ******************************************************************************/
133 AcpiHwValidateIoRequest (
134 ACPI_IO_ADDRESS Address,
139 ACPI_IO_ADDRESS LastAddress;
140 const ACPI_PORT_INFO *PortInfo;
143 ACPI_FUNCTION_TRACE (HwValidateIoRequest);
146 /* Supported widths are 8/16/32 */
148 if ((BitWidth != 8) &&
152 ACPI_ERROR ((AE_INFO,
153 "Bad BitWidth parameter: %8.8X", BitWidth));
154 return (AE_BAD_PARAMETER);
157 PortInfo = AcpiProtectedPorts;
158 ByteWidth = ACPI_DIV_8 (BitWidth);
159 LastAddress = Address + ByteWidth - 1;
161 ACPI_DEBUG_PRINT ((ACPI_DB_IO, "Address %p LastAddress %p Length %X",
162 ACPI_CAST_PTR (void, Address), ACPI_CAST_PTR (void, LastAddress),
165 /* Maximum 16-bit address in I/O space */
167 if (LastAddress > ACPI_UINT16_MAX)
169 ACPI_ERROR ((AE_INFO,
170 "Illegal I/O port address/length above 64K: %p/0x%X",
171 ACPI_CAST_PTR (void, Address), ByteWidth));
172 return_ACPI_STATUS (AE_LIMIT);
175 /* Exit if requested address is not within the protected port table */
177 if (Address > AcpiProtectedPorts[ACPI_PORT_INFO_ENTRIES - 1].End)
179 return_ACPI_STATUS (AE_OK);
182 /* Check request against the list of protected I/O ports */
184 for (i = 0; i < ACPI_PORT_INFO_ENTRIES; i++, PortInfo++)
187 * Check if the requested address range will write to a reserved
188 * port. Four cases to consider:
190 * 1) Address range is contained completely in the port address range
191 * 2) Address range overlaps port range at the port range start
192 * 3) Address range overlaps port range at the port range end
193 * 4) Address range completely encompasses the port range
195 if ((Address <= PortInfo->End) && (LastAddress >= PortInfo->Start))
197 /* Port illegality may depend on the _OSI calls made by the BIOS */
199 if (AcpiGbl_OsiData >= PortInfo->OsiDependency)
201 ACPI_DEBUG_PRINT ((ACPI_DB_IO,
202 "Denied AML access to port 0x%p/%X (%s 0x%.4X-0x%.4X)",
203 ACPI_CAST_PTR (void, Address), ByteWidth, PortInfo->Name,
204 PortInfo->Start, PortInfo->End));
206 return_ACPI_STATUS (AE_AML_ILLEGAL_ADDRESS);
210 /* Finished if address range ends before the end of this port */
212 if (LastAddress <= PortInfo->End)
218 return_ACPI_STATUS (AE_OK);
222 /******************************************************************************
224 * FUNCTION: AcpiHwReadPort
226 * PARAMETERS: Address Address of I/O port/register to read
227 * Value Where value is placed
228 * Width Number of bits
230 * RETURN: Status and value read from port
232 * DESCRIPTION: Read data from an I/O port or register. This is a front-end
233 * to AcpiOsReadPort that performs validation on both the port
234 * address and the length.
236 *****************************************************************************/
240 ACPI_IO_ADDRESS Address,
249 /* Truncate address to 16 bits if requested */
251 if (AcpiGbl_TruncateIoAddresses)
253 Address &= ACPI_UINT16_MAX;
256 /* Validate the entire request and perform the I/O */
258 Status = AcpiHwValidateIoRequest (Address, Width);
259 if (ACPI_SUCCESS (Status))
261 Status = AcpiOsReadPort (Address, Value, Width);
265 if (Status != AE_AML_ILLEGAL_ADDRESS)
271 * There has been a protection violation within the request. Fall
272 * back to byte granularity port I/O and ignore the failing bytes.
273 * This provides Windows compatibility.
275 for (i = 0, *Value = 0; i < Width; i += 8)
277 /* Validate and read one byte */
279 if (AcpiHwValidateIoRequest (Address, 8) == AE_OK)
281 Status = AcpiOsReadPort (Address, &OneByte, 8);
282 if (ACPI_FAILURE (Status))
287 *Value |= (OneByte << i);
297 /******************************************************************************
299 * FUNCTION: AcpiHwWritePort
301 * PARAMETERS: Address Address of I/O port/register to write
302 * Value Value to write
303 * Width Number of bits
307 * DESCRIPTION: Write data to an I/O port or register. This is a front-end
308 * to AcpiOsWritePort that performs validation on both the port
309 * address and the length.
311 *****************************************************************************/
315 ACPI_IO_ADDRESS Address,
323 /* Truncate address to 16 bits if requested */
325 if (AcpiGbl_TruncateIoAddresses)
327 Address &= ACPI_UINT16_MAX;
330 /* Validate the entire request and perform the I/O */
332 Status = AcpiHwValidateIoRequest (Address, Width);
333 if (ACPI_SUCCESS (Status))
335 Status = AcpiOsWritePort (Address, Value, Width);
339 if (Status != AE_AML_ILLEGAL_ADDRESS)
345 * There has been a protection violation within the request. Fall
346 * back to byte granularity port I/O and ignore the failing bytes.
347 * This provides Windows compatibility.
349 for (i = 0; i < Width; i += 8)
351 /* Validate and write one byte */
353 if (AcpiHwValidateIoRequest (Address, 8) == AE_OK)
355 Status = AcpiOsWritePort (Address, (Value >> i) & 0xFF, 8);
356 if (ACPI_FAILURE (Status))