diff options
Diffstat (limited to 'c/src/lib/libbsp/arm/arm_bare_bsp/irq')
| -rw-r--r-- | c/src/lib/libbsp/arm/arm_bare_bsp/irq/.cvsignore | 2 | ||||
| -rw-r--r-- | c/src/lib/libbsp/arm/arm_bare_bsp/irq/Makefile.am | 44 | ||||
| -rw-r--r-- | c/src/lib/libbsp/arm/arm_bare_bsp/irq/bsp_irq_asm.S | 44 | ||||
| -rw-r--r-- | c/src/lib/libbsp/arm/arm_bare_bsp/irq/bsp_irq_init.c | 27 | ||||
| -rw-r--r-- | c/src/lib/libbsp/arm/arm_bare_bsp/irq/irq.c | 119 | ||||
| -rw-r--r-- | c/src/lib/libbsp/arm/arm_bare_bsp/irq/irq.h | 168 |
6 files changed, 404 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/arm/arm_bare_bsp/irq/.cvsignore b/c/src/lib/libbsp/arm/arm_bare_bsp/irq/.cvsignore new file mode 100644 index 0000000000..282522db03 --- /dev/null +++ b/c/src/lib/libbsp/arm/arm_bare_bsp/irq/.cvsignore @@ -0,0 +1,2 @@ +Makefile +Makefile.in diff --git a/c/src/lib/libbsp/arm/arm_bare_bsp/irq/Makefile.am b/c/src/lib/libbsp/arm/arm_bare_bsp/irq/Makefile.am new file mode 100644 index 0000000000..ec9fccfbf4 --- /dev/null +++ b/c/src/lib/libbsp/arm/arm_bare_bsp/irq/Makefile.am @@ -0,0 +1,44 @@ +## +## $Id$ +## + +AUTOMAKE_OPTIONS = foreign 1.4 + +VPATH = @srcdir@:@srcdir@/../../shared/irq + +PGM = $(ARCH)/irq.rel + +C_FILES = irq.c irq_init.c bsp_irq_init.c +S_FILES = irq_asm.S bsp_irq_asm.S +H_FILES = irq.h + +C_O_FILES = $(C_FILES:%.c=$(ARCH)/%.o) +S_O_FILES = $(S_FILES:%.S=$(ARCH)/%.o) + +irq_rel_OBJECTS = $(C_O_FILES) $(S_O_FILES) + +$(PROJECT_INCLUDE): + $(mkinstalldirs) $@ + +$(PROJECT_INCLUDE)/%.h: %.h + $(INSTALL_DATA) $< $@ + +PREINSTALL_FILES += $(PROJECT_INCLUDE) $(H_FILES:%.h=$(PROJECT_INCLUDE)/%.h) + +include $(RTEMS_ROOT)/make/custom/@RTEMS_BSP@.cfg +include $(top_srcdir)/../../../../../../automake/lib.am + +# +# (OPTIONAL) Add local stuff here using += +# + +$(PGM): $(startup_rel_OBJECTS) + $(make-rel) + +all: $(PREINSTALL_FILES) $(ARCH) $(irq_rel_OBJECTS) $(PGM) + +.PRECIOUS: $(PGM) + +EXTRA_DIST = irq.c bsp_irq_init.c bsp_irq_asm.S + +include $(top_srcdir)/../../../../../../automake/local.am diff --git a/c/src/lib/libbsp/arm/arm_bare_bsp/irq/bsp_irq_asm.S b/c/src/lib/libbsp/arm/arm_bare_bsp/irq/bsp_irq_asm.S new file mode 100644 index 0000000000..5e0a36d705 --- /dev/null +++ b/c/src/lib/libbsp/arm/arm_bare_bsp/irq/bsp_irq_asm.S @@ -0,0 +1,44 @@ +/* bsp_irq_asm.S + * + * This file contains the implementation of the IRQ handler + * for a specific BSP + * + * CopyRight (C) 2000 Canon Research France SA. + * Emmanuel Raguet, mailto:raguet@crf.canon.fr + * + * The license and distribution terms for this file may be + * found in found in the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + */ + +#define __asm__ +#include <registers.h> + +/* + * Function to obtain, execute an IT handler and acknowledge the IT + */ + + .globl ExecuteITHandler + +ExecuteITHandler : + + /* + * Here is the code to execute the appropriate INT handler + */ + + b ReturnFromHandler /* return to ISR handler */ + +/* + * Function to acknowledge the IT controller + */ + .globl AckControler + +AckControler: + + /* + * Here is the code to acknowledge the PIC + */ + + b ReturnFromAck /* return to ISR handler */ + diff --git a/c/src/lib/libbsp/arm/arm_bare_bsp/irq/bsp_irq_init.c b/c/src/lib/libbsp/arm/arm_bare_bsp/irq/bsp_irq_init.c new file mode 100644 index 0000000000..cdaa289b06 --- /dev/null +++ b/c/src/lib/libbsp/arm/arm_bare_bsp/irq/bsp_irq_init.c @@ -0,0 +1,27 @@ +/* irq_init.c + * + * This file contains the implementation of rtems initialization + * related to interrupt handling. + * + * CopyRight (C) 2000 Canon Research Centre France SA. + * Emmanuel Raguet, mailto:raguet@crf.canon.fr + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ +#include <irq.h> +#include <bsp.h> +#include <registers.h> + + +void BSP_rtems_irq_mngt_init() { + + /* + * Here is the code to initialize the INT for + * the specified BSP + */ + +} diff --git a/c/src/lib/libbsp/arm/arm_bare_bsp/irq/irq.c b/c/src/lib/libbsp/arm/arm_bare_bsp/irq/irq.c new file mode 100644 index 0000000000..b4f2d14931 --- /dev/null +++ b/c/src/lib/libbsp/arm/arm_bare_bsp/irq/irq.c @@ -0,0 +1,119 @@ +/* irq.c + * + * This file contains the implementation of the function described in irq.h + * + * CopyRight (C) 2000 Canon Research France SA. + * Emmanuel Raguet, mailto:raguet@crf.canon.fr + * + * The license and distribution terms for this file may be + * found in found in the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + + +#include <bsp.h> +#include <irq.h> +#include <registers.h> +#include <rtems/score/thread.h> +#include <rtems/score/apiext.h> + + +/* + * This function check that the value given for the irq line + * is valid. + */ + +static int isValidInterrupt(int irq) +{ + if ( (irq < 0) || (irq > BSP_MAX_INT)) + return 0; + return 1; +} + +/* + * ------------------------ RTEMS Single Irq Handler Mngt Routines ---------------- + */ + +int BSP_install_rtems_irq_handler (const rtems_irq_connect_data* irq) +{ + rtems_irq_hdl *HdlTable; + + if (!isValidInterrupt(irq->name)) { + return 0; + } + /* + * Check if default handler is actually connected. If not issue an error. + */ + HdlTable = VECTOR_TABLE; + if (*(HdlTable + irq->name) != default_int_handler) { + return 0; + } + + _CPU_ISR_Disable(level); + + /* + * store the new handler + */ + *(HdlTable + irq->name) = irq->hdl; + + /* + * Here is the code to install an interrupt vector + * for the BSP : unmask INT, .... + * ........................ + */ + + _CPU_ISR_Enable(level); + + return 1; +} + +int BSP_remove_rtems_irq_handler (const rtems_irq_connect_data* irq) +{ + rtems_irq_hdl *HdlTable; + + if (!isValidInterrupt(irq->name)) { + return 0; + } + /* + * Check if the handler is actually connected. If not issue an error. + */ + HdlTable = VECTOR_TABLE; + if (*(HdlTable + irq->name) != irq->hdl) { + return 0; + } + _CPU_ISR_Disable(level); + + /* + * Here is the code to uninstall an interrupt vector + * for the BSP : mask INT, .... + * ........................ + */ + + /* + * restore the default irq value + */ + *(HdlTable + irq->name) = default_int_handler; + + _CPU_ISR_Enable(level); + + return 1; +} + + + +void _ThreadProcessSignalsFromIrq (CPU_Exception_frame* ctx) +{ + /* + * Process pending signals that have not already been + * processed by _Thread_Displatch. This happens quite + * unfrequently : the ISR must have posted an action + * to the current running thread. + */ + if ( _Thread_Do_post_task_switch_extension || + _Thread_Executing->do_post_task_switch_extension ) { + _Thread_Executing->do_post_task_switch_extension = FALSE; + _API_extensions_Run_postswitch(); + } +} diff --git a/c/src/lib/libbsp/arm/arm_bare_bsp/irq/irq.h b/c/src/lib/libbsp/arm/arm_bare_bsp/irq/irq.h new file mode 100644 index 0000000000..0148267345 --- /dev/null +++ b/c/src/lib/libbsp/arm/arm_bare_bsp/irq/irq.h @@ -0,0 +1,168 @@ +/* irq.h + * + * This include file describe the data structure and the functions implemented + * by rtems to write interrupt handlers. + * + * Copyright (c) 2000 Canon Research Centre France SA. + * Emmanuel Raguet, mailto:raguet@crf.canon.fr + * + * The license and distribution terms for this file may be + * found in found in the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + */ + +#ifndef _IRQ_H_ +#define _IRQ_H_ + +#ifdef __cplusplus +extern "C" { +#endif + +/* + * Include some preprocessor value also used by assember code + */ + +#include <rtems.h> + +extern void default_int_handler(); +/*-------------------------------------------------------------------------+ +| Constants ++--------------------------------------------------------------------------*/ + + /* enum of the possible interrupt sources */ +typedef enum { + BSP_INT_1 = 0, + BSP_INT_2 = 1, + BSP_UART = 2, + BSP_MAX_INT = 3 +} rtems_irq_symbolic_name; + + /* define that can be useful (the values are just examples) */ +#define INTMASK 0x01 +#define VECTOR_TABLE 0x00 + +/* + * Type definition for RTEMS managed interrupts + */ +typedef unsigned char rtems_irq_level; +typedef unsigned char rtems_irq_trigger; + +struct __rtems_irq_connect_data__; /* forward declaratiuon */ + +typedef void (*rtems_irq_hdl) (void); +typedef void (*rtems_irq_enable) (const struct __rtems_irq_connect_data__*); +typedef void (*rtems_irq_disable) (const struct __rtems_irq_connect_data__*); +typedef int (*rtems_irq_is_enabled) (const struct __rtems_irq_connect_data__*); + +typedef struct __rtems_irq_connect_data__ { + /* + * IRQ line + */ + rtems_irq_symbolic_name name; + /* + * handler. See comment on handler properties below in function prototype. + */ + rtems_irq_hdl hdl; + /* + * function for enabling interrupts at device level (ONLY!). + * The BSP code will automatically enable it at i8259s level. + * RATIONALE : anyway such code has to exist in current driver code. + * It is usually called immediately AFTER connecting the interrupt handler. + * RTEMS may well need such a function when restoring normal interrupt + * processing after a debug session. + * + */ + rtems_irq_enable on; + /* + * function for disabling interrupts at device level (ONLY!). + * The code will disable it at i8259s level. RATIONALE : anyway + * such code has to exist for clean shutdown. It is usually called + * BEFORE disconnecting the interrupt. RTEMS may well need such + * a function when disabling normal interrupt processing for + * a debug session. May well be a NOP function. + */ + rtems_irq_disable off; + /* + * function enabling to know what interrupt may currently occur + * if someone manipulates the i8259s interrupt mask without care... + */ + rtems_irq_is_enabled isOn; + /* + * priority level at the vplus level + */ + rtems_irq_level irqLevel; + /* + * Trigger way : Rising or falling edge or High or low level + */ + rtems_irq_trigger irqTrigger; +} rtems_irq_connect_data; + +/*-------------------------------------------------------------------------+ +| Function Prototypes. ++--------------------------------------------------------------------------*/ +/* + * ------------------------ RTEMS Single Irq Handler Mngt Routines ---------------- + */ + +/* + * function to initialize the interrupt for a specific BSP + */ +void BSP_rtems_irq_mngt_init(); + + +/* + * function to connect a particular irq handler. This hanlder will NOT be called + * directly as the result of the corresponding interrupt. Instead, a RTEMS + * irq prologue will be called that will : + * + * 1) save the C scratch registers, + * 2) switch to a interrupt stack if the interrupt is not nested, + * 3) store the current i8259s' interrupt masks + * 4) modify them to disable the current interrupt at 8259 level (and may + * be others depending on software priorities) + * 5) aknowledge the i8259s', + * 6) demask the processor, + * 7) call the application handler + * + * As a result the hdl function provided + * + * a) can perfectly be written is C, + * b) may also well directly call the part of the RTEMS API that can be used + * from interrupt level, + * c) It only responsible for handling the jobs that need to be done at + * the device level including (aknowledging/re-enabling the interrupt at device, + * level, getting the data,...) + * + * When returning from the function, the following will be performed by + * the RTEMS irq epilogue : + * + * 1) masks the interrupts again, + * 2) restore the original i8259s' interrupt masks + * 3) switch back on the orinal stack if needed, + * 4) perform rescheduling when necessary, + * 5) restore the C scratch registers... + * 6) restore initial execution flow + * + */ + +int BSP_install_rtems_irq_handler (const rtems_irq_connect_data*); +/* + * function to get the current RTEMS irq handler for ptr->name. It enables to + * define hanlder chain... + */ +int BSP_get_current_rtems_irq_handler (rtems_irq_connect_data* ptr); +/* + * function to get disconnect the RTEMS irq handler for ptr->name. + * This function checks that the value given is the current one for safety reason. + * The user can use the previous function to get it. + */ +int BSP_remove_rtems_irq_handler (const rtems_irq_connect_data*); + + +#ifdef __cplusplus +} +#endif + +#endif /* _IRQ_H_ */ +/* end of include file */ |