1 /*******************************************************************************
3 * Module Name: evsci - System Control Interrupt configuration and
4 * legacy to ACPI mode state transition functions
6 ******************************************************************************/
9 * Copyright (C) 2000 - 2012, Intel Corp.
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21 * including a substantially similar Disclaimer requirement for further
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50 #define _COMPONENT ACPI_EVENTS
51 ACPI_MODULE_NAME ("evsci")
53 #if (!ACPI_REDUCED_HARDWARE) /* Entire module */
55 /* Local prototypes */
57 static UINT32 ACPI_SYSTEM_XFACE
58 AcpiEvSciXruptHandler (
62 /*******************************************************************************
64 * FUNCTION: AcpiEvSciXruptHandler
66 * PARAMETERS: Context - Calling Context
68 * RETURN: Status code indicates whether interrupt was handled.
70 * DESCRIPTION: Interrupt handler that will figure out what function or
71 * control method to call to deal with a SCI.
73 ******************************************************************************/
75 static UINT32 ACPI_SYSTEM_XFACE
76 AcpiEvSciXruptHandler (
79 ACPI_GPE_XRUPT_INFO *GpeXruptList = Context;
80 UINT32 InterruptHandled = ACPI_INTERRUPT_NOT_HANDLED;
83 ACPI_FUNCTION_TRACE (EvSciXruptHandler);
87 * We are guaranteed by the ACPI CA initialization/shutdown code that
88 * if this interrupt handler is installed, ACPI is enabled.
93 * Check for and dispatch any Fixed Events that have occurred
95 InterruptHandled |= AcpiEvFixedEventDetect ();
98 * General Purpose Events:
99 * Check for and dispatch any GPEs that have occurred
101 InterruptHandled |= AcpiEvGpeDetect (GpeXruptList);
104 return_VALUE (InterruptHandled);
108 /*******************************************************************************
110 * FUNCTION: AcpiEvGpeXruptHandler
112 * PARAMETERS: Context - Calling Context
114 * RETURN: Status code indicates whether interrupt was handled.
116 * DESCRIPTION: Handler for GPE Block Device interrupts
118 ******************************************************************************/
120 UINT32 ACPI_SYSTEM_XFACE
121 AcpiEvGpeXruptHandler (
124 ACPI_GPE_XRUPT_INFO *GpeXruptList = Context;
125 UINT32 InterruptHandled = ACPI_INTERRUPT_NOT_HANDLED;
128 ACPI_FUNCTION_TRACE (EvGpeXruptHandler);
132 * We are guaranteed by the ACPI CA initialization/shutdown code that
133 * if this interrupt handler is installed, ACPI is enabled.
136 /* GPEs: Check for and dispatch any GPEs that have occurred */
138 InterruptHandled |= AcpiEvGpeDetect (GpeXruptList);
140 return_VALUE (InterruptHandled);
144 /******************************************************************************
146 * FUNCTION: AcpiEvInstallSciHandler
152 * DESCRIPTION: Installs SCI handler.
154 ******************************************************************************/
157 AcpiEvInstallSciHandler (
160 UINT32 Status = AE_OK;
163 ACPI_FUNCTION_TRACE (EvInstallSciHandler);
166 Status = AcpiOsInstallInterruptHandler ((UINT32) AcpiGbl_FADT.SciInterrupt,
167 AcpiEvSciXruptHandler, AcpiGbl_GpeXruptListHead);
168 return_ACPI_STATUS (Status);
172 /******************************************************************************
174 * FUNCTION: AcpiEvRemoveSciHandler
178 * RETURN: E_OK if handler uninstalled OK, E_ERROR if handler was not
179 * installed to begin with
181 * DESCRIPTION: Remove the SCI interrupt handler. No further SCIs will be
184 * Note: It doesn't seem important to disable all events or set the event
185 * enable registers to their original values. The OS should disable
186 * the SCI interrupt level when the handler is removed, so no more
187 * events will come in.
189 ******************************************************************************/
192 AcpiEvRemoveSciHandler (
198 ACPI_FUNCTION_TRACE (EvRemoveSciHandler);
201 /* Just let the OS remove the handler and disable the level */
203 Status = AcpiOsRemoveInterruptHandler ((UINT32) AcpiGbl_FADT.SciInterrupt,
204 AcpiEvSciXruptHandler);
206 return_ACPI_STATUS (Status);
209 #endif /* !ACPI_REDUCED_HARDWARE */