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path: root/drivers/acpi/acpica/hwvalid.c
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Diffstat (limited to 'drivers/acpi/acpica/hwvalid.c')
-rw-r--r--drivers/acpi/acpica/hwvalid.c115
1 files changed, 93 insertions, 22 deletions
diff --git a/drivers/acpi/acpica/hwvalid.c b/drivers/acpi/acpica/hwvalid.c
index 7737afb157c..6b919127cd9 100644
--- a/drivers/acpi/acpica/hwvalid.c
+++ b/drivers/acpi/acpica/hwvalid.c
@@ -1,4 +1,3 @@
-
/******************************************************************************
*
* Module Name: hwvalid - I/O request validation
@@ -6,7 +5,7 @@
*****************************************************************************/
/*
- * Copyright (C) 2000 - 2009, Intel Corp.
+ * Copyright (C) 2000 - 2014, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -58,7 +57,7 @@ acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width);
*
* The table is used to implement the Microsoft port access rules that
* first appeared in Windows XP. Some ports are always illegal, and some
- * ports are only illegal if the BIOS calls _OSI with a win_xP string or
+ * ports are only illegal if the BIOS calls _OSI with a win_XP string or
* later (meaning that the BIOS itelf is post-XP.)
*
* This provides ACPICA with the desired port protections and
@@ -66,7 +65,7 @@ acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width);
*
* Description of port entries:
* DMA: DMA controller
- * PIC0: Programmable Interrupt Controller (8259_a)
+ * PIC0: Programmable Interrupt Controller (8259A)
* PIT1: System Timer 1
* PIT2: System Timer 2 failsafe
* RTC: Real-time clock
@@ -90,6 +89,7 @@ static const struct acpi_port_info acpi_protected_ports[] = {
{"PIT2", 0x0048, 0x004B, ACPI_OSI_WIN_XP},
{"RTC", 0x0070, 0x0071, ACPI_OSI_WIN_XP},
{"CMOS", 0x0074, 0x0076, ACPI_OSI_WIN_XP},
+ {"DMA1", 0x0081, 0x0083, ACPI_OSI_WIN_XP},
{"DMA1L", 0x0087, 0x0087, ACPI_OSI_WIN_XP},
{"DMA2", 0x0089, 0x008B, ACPI_OSI_WIN_XP},
{"DMA2L", 0x008F, 0x008F, ACPI_OSI_WIN_XP},
@@ -133,7 +133,9 @@ acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width)
/* Supported widths are 8/16/32 */
if ((bit_width != 8) && (bit_width != 16) && (bit_width != 32)) {
- return AE_BAD_PARAMETER;
+ ACPI_ERROR((AE_INFO,
+ "Bad BitWidth parameter: %8.8X", bit_width));
+ return (AE_BAD_PARAMETER);
}
port_info = acpi_protected_ports;
@@ -149,9 +151,9 @@ acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width)
if (last_address > ACPI_UINT16_MAX) {
ACPI_ERROR((AE_INFO,
- "Illegal I/O port address/length above 64K: 0x%p/%X",
+ "Illegal I/O port address/length above 64K: %p/0x%X",
ACPI_CAST_PTR(void, address), byte_width));
- return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS);
+ return_ACPI_STATUS(AE_LIMIT);
}
/* Exit if requested address is not within the protected port table */
@@ -178,11 +180,12 @@ acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width)
/* Port illegality may depend on the _OSI calls made by the BIOS */
if (acpi_gbl_osi_data >= port_info->osi_dependency) {
- ACPI_ERROR((AE_INFO,
- "Denied AML access to port 0x%p/%X (%s 0x%.4X-0x%.4X)",
- ACPI_CAST_PTR(void, address),
- byte_width, port_info->name,
- port_info->start, port_info->end));
+ ACPI_DEBUG_PRINT((ACPI_DB_IO,
+ "Denied AML access to port 0x%p/%X (%s 0x%.4X-0x%.4X)",
+ ACPI_CAST_PTR(void, address),
+ byte_width, port_info->name,
+ port_info->start,
+ port_info->end));
return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS);
}
@@ -206,7 +209,7 @@ acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width)
* Value Where value is placed
* Width Number of bits
*
- * RETURN: Value read from port
+ * RETURN: Status and value read from port
*
* DESCRIPTION: Read data from an I/O port or register. This is a front-end
* to acpi_os_read_port that performs validation on both the port
@@ -217,14 +220,49 @@ acpi_hw_validate_io_request(acpi_io_address address, u32 bit_width)
acpi_status acpi_hw_read_port(acpi_io_address address, u32 *value, u32 width)
{
acpi_status status;
+ u32 one_byte;
+ u32 i;
+
+ /* Truncate address to 16 bits if requested */
+
+ if (acpi_gbl_truncate_io_addresses) {
+ address &= ACPI_UINT16_MAX;
+ }
+
+ /* Validate the entire request and perform the I/O */
status = acpi_hw_validate_io_request(address, width);
- if (ACPI_FAILURE(status)) {
- return status;
+ if (ACPI_SUCCESS(status)) {
+ status = acpi_os_read_port(address, value, width);
+ return (status);
+ }
+
+ if (status != AE_AML_ILLEGAL_ADDRESS) {
+ return (status);
+ }
+
+ /*
+ * There has been a protection violation within the request. Fall
+ * back to byte granularity port I/O and ignore the failing bytes.
+ * This provides Windows compatibility.
+ */
+ for (i = 0, *value = 0; i < width; i += 8) {
+
+ /* Validate and read one byte */
+
+ if (acpi_hw_validate_io_request(address, 8) == AE_OK) {
+ status = acpi_os_read_port(address, &one_byte, 8);
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+
+ *value |= (one_byte << i);
+ }
+
+ address++;
}
- status = acpi_os_read_port(address, value, width);
- return status;
+ return (AE_OK);
}
/******************************************************************************
@@ -235,7 +273,7 @@ acpi_status acpi_hw_read_port(acpi_io_address address, u32 *value, u32 width)
* Value Value to write
* Width Number of bits
*
- * RETURN: None
+ * RETURN: Status
*
* DESCRIPTION: Write data to an I/O port or register. This is a front-end
* to acpi_os_write_port that performs validation on both the port
@@ -246,12 +284,45 @@ acpi_status acpi_hw_read_port(acpi_io_address address, u32 *value, u32 width)
acpi_status acpi_hw_write_port(acpi_io_address address, u32 value, u32 width)
{
acpi_status status;
+ u32 i;
+
+ /* Truncate address to 16 bits if requested */
+
+ if (acpi_gbl_truncate_io_addresses) {
+ address &= ACPI_UINT16_MAX;
+ }
+
+ /* Validate the entire request and perform the I/O */
status = acpi_hw_validate_io_request(address, width);
- if (ACPI_FAILURE(status)) {
- return status;
+ if (ACPI_SUCCESS(status)) {
+ status = acpi_os_write_port(address, value, width);
+ return (status);
+ }
+
+ if (status != AE_AML_ILLEGAL_ADDRESS) {
+ return (status);
+ }
+
+ /*
+ * There has been a protection violation within the request. Fall
+ * back to byte granularity port I/O and ignore the failing bytes.
+ * This provides Windows compatibility.
+ */
+ for (i = 0; i < width; i += 8) {
+
+ /* Validate and write one byte */
+
+ if (acpi_hw_validate_io_request(address, 8) == AE_OK) {
+ status =
+ acpi_os_write_port(address, (value >> i) & 0xFF, 8);
+ if (ACPI_FAILURE(status)) {
+ return (status);
+ }
+ }
+
+ address++;
}
- status = acpi_os_write_port(address, value, width);
- return status;
+ return (AE_OK);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 23:26:48 +0000