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[/] [or1k/] [trunk/] [rtems-20020807/] [c/] [src/] [lib/] [libbsp/] [i386/] [shared/] [irq/] [irq.c] - Rev 1765
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/* irq.c * * This file contains the implementation of the function described in irq.h * * CopyRight (C) 1998 valette@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. * * irq.c,v 1.7 1999/08/05 18:02:15 joel Exp */ #include <bsp.h> #include <irq.h> #include <rtems/score/thread.h> #include <rtems/score/apiext.h> /* * pointer to the mask representing the additionnal irq vectors * that must be disabled when a particular entry is activated. * They will be dynamically computed from teh prioruty table given * in BSP_rtems_irq_mngt_set(); * CAUTION : this table is accessed directly by interrupt routine * prologue. */ rtems_i8259_masks irq_mask_or_tbl[BSP_IRQ_LINES_NUMBER]; /* * Copy of data given via initial BSP_rtems_irq_mngt_set() for * the sake of efficiency. * CAUTION : this table is accessed directly by interrupt routine * prologue. */ rtems_irq_hdl current_irq[BSP_IRQ_LINES_NUMBER]; /* * default handler connected on each irq after bsp initialization */ static rtems_irq_connect_data default_rtems_entry; /* * location used to store initial tables used for interrupt * management. */ static rtems_irq_global_settings* internal_config; static rtems_irq_connect_data* rtems_hdl_tbl; /*-------------------------------------------------------------------------+ | Cache for 1st and 2nd PIC IRQ line's status (enabled or disabled) register. +--------------------------------------------------------------------------*/ /* * lower byte is interrupt mask on the master PIC. * while upper bits are interrupt on the slave PIC. * This cache is initialized in ldseg.s */ rtems_i8259_masks i8259s_cache = 0xFFFB; /*-------------------------------------------------------------------------+ | Function: BSP_irq_disable_at_i8259s | Description: Mask IRQ line in appropriate PIC chip. | Global Variables: i8259s_cache | Arguments: vector_offset - number of IRQ line to mask. | Returns: Nothing. +--------------------------------------------------------------------------*/ int BSP_irq_disable_at_i8259s (const rtems_irq_symbolic_name irqLine) { unsigned short mask; unsigned int level; if ( ((int)irqLine < BSP_LOWEST_OFFSET) || ((int)irqLine > BSP_MAX_OFFSET ) ) return 1; _CPU_ISR_Disable(level); mask = 1 << irqLine; i8259s_cache |= mask; if (irqLine < 8) { outport_byte(PIC_MASTER_IMR_IO_PORT, i8259s_cache & 0xff); } else { outport_byte(PIC_SLAVE_IMR_IO_PORT, ((i8259s_cache & 0xff00) >> 8)); } _CPU_ISR_Enable (level); return 0; } /*-------------------------------------------------------------------------+ | Function: BSP_irq_enable_at_i8259s | Description: Unmask IRQ line in appropriate PIC chip. | Global Variables: i8259s_cache | Arguments: irqLine - number of IRQ line to mask. | Returns: Nothing. +--------------------------------------------------------------------------*/ int BSP_irq_enable_at_i8259s (const rtems_irq_symbolic_name irqLine) { unsigned short mask; unsigned int level; if ( ((int)irqLine < BSP_LOWEST_OFFSET) || ((int)irqLine > BSP_MAX_OFFSET ) ) return 1; _CPU_ISR_Disable(level); mask = ~(1 << irqLine); i8259s_cache &= mask; if (irqLine < 8) { outport_byte(PIC_MASTER_IMR_IO_PORT, i8259s_cache & 0xff); } else { outport_byte(PIC_SLAVE_IMR_IO_PORT, ((i8259s_cache & 0xff00) >> 8)); } _CPU_ISR_Enable (level); return 0; } /* mask_irq */ int BSP_irq_enabled_at_i8259s (const rtems_irq_symbolic_name irqLine) { unsigned short mask; if ( ((int)irqLine < BSP_LOWEST_OFFSET) || ((int)irqLine > BSP_MAX_OFFSET ) ) return 1; mask = (1 << irqLine); return (~(i8259s_cache & mask)); } /*-------------------------------------------------------------------------+ | Function: BSP_irq_ack_at_i8259s | Description: Signal generic End Of Interrupt (EOI) to appropriate PIC. | Global Variables: None. | Arguments: irqLine - number of IRQ line to acknowledge. | Returns: Nothing. +--------------------------------------------------------------------------*/ int BSP_irq_ack_at_i8259s (const rtems_irq_symbolic_name irqLine) { if ( ((int)irqLine < BSP_LOWEST_OFFSET) || ((int)irqLine > BSP_MAX_OFFSET ) ) return 1; if (irqLine >= 8) { outport_byte(PIC_SLAVE_COMMAND_IO_PORT, PIC_EOI); } outport_byte(PIC_MASTER_COMMAND_IO_PORT, PIC_EOI); return 0; } /* ackIRQ */ /* * ------------------------ RTEMS Irq helper functions ---------------- */ /* * Caution : this function assumes the variable "internal_config" * is already set and that the tables it contains are still valid * and accessible. */ static void compute_i8259_masks_from_prio () { unsigned int i; unsigned int j; /* * Always mask at least current interrupt to prevent re-entrance */ for (i=0; i < internal_config->irqNb; i++) { * ((unsigned short*) &irq_mask_or_tbl[i]) = (1 << i); for (j = 0; j < internal_config->irqNb; j++) { /* * Mask interrupts at i8259 level that have a lower priority */ if (internal_config->irqPrioTbl [i] > internal_config->irqPrioTbl [j]) { * ((unsigned short*) &irq_mask_or_tbl[i]) |= (1 << j); } } } } /* * Caution : this function assumes the variable "internal_config" * is already set and that the tables it contains are still valid * and accessible. */ static void make_copy_of_handlers () { int i; for (i=0; i < internal_config->irqNb; i++) { current_irq [i] = internal_config->irqHdlTbl[i].hdl; } } /* * This function check that the value given for the irq line * is valid. */ static int isValidInterrupt(int irq) { if ( (irq < BSP_LOWEST_OFFSET) || (irq > BSP_MAX_OFFSET)) return 0; return 1; } /* * ------------------------ RTEMS Single Irq Handler Mngt Routines ---------------- */ int BSP_install_rtems_irq_handler (const rtems_irq_connect_data* irq) { unsigned int level; if (!isValidInterrupt(irq->name)) { return 0; } /* * Check if default handler is actually connected. If not issue an error. * You must first get the current handler via i386_get_current_idt_entry * and then disconnect it using i386_delete_idt_entry. * RATIONALE : to always have the same transition by forcing the user * to get the previous handler before accepting to disconnect. */ if (rtems_hdl_tbl[irq->name].hdl != default_rtems_entry.hdl) { return 0; } _CPU_ISR_Disable(level); /* * store the data provided by user */ rtems_hdl_tbl[irq->name] = *irq; /* * update table used directly by rtems interrupt prologue */ current_irq [irq->name] = irq->hdl; /* * Enable interrupt at PIC level */ BSP_irq_enable_at_i8259s (irq->name); /* * Enable interrupt on device */ irq->on(irq); _CPU_ISR_Enable(level); return 1; } int BSP_get_current_rtems_irq_handler (rtems_irq_connect_data* irq) { if (!isValidInterrupt(irq->name)) { return 0; } *irq = rtems_hdl_tbl[irq->name]; return 1; } int BSP_remove_rtems_irq_handler (const rtems_irq_connect_data* irq) { unsigned int level; if (!isValidInterrupt(irq->name)) { return 0; } /* * Check if default handler is actually connected. If not issue an error. * You must first get the current handler via i386_get_current_idt_entry * and then disconnect it using i386_delete_idt_entry. * RATIONALE : to always have the same transition by forcing the user * to get the previous handler before accepting to disconnect. */ if (rtems_hdl_tbl[irq->name].hdl != irq->hdl) { return 0; } _CPU_ISR_Disable(level); /* * disable interrupt at PIC level */ BSP_irq_disable_at_i8259s (irq->name); /* * Disable interrupt on device */ irq->off(irq); /* * restore the default irq value */ rtems_hdl_tbl[irq->name] = default_rtems_entry; current_irq[irq->name] = default_rtems_entry.hdl; _CPU_ISR_Enable(level); return 1; } /* * ------------------------ RTEMS Global Irq Handler Mngt Routines ---------------- */ int BSP_rtems_irq_mngt_set(rtems_irq_global_settings* config) { int i; unsigned int level; /* * Store various code accelerators */ internal_config = config; default_rtems_entry = config->defaultEntry; rtems_hdl_tbl = config->irqHdlTbl; _CPU_ISR_Disable(level); /* * set up internal tables used by rtems interrupt prologue */ compute_i8259_masks_from_prio (); make_copy_of_handlers (); for (i=0; i < internal_config->irqNb; i++) { if (rtems_hdl_tbl[i].hdl != default_rtems_entry.hdl) { BSP_irq_enable_at_i8259s (i); rtems_hdl_tbl[i].on(&rtems_hdl_tbl[i]); } else { rtems_hdl_tbl[i].off(&rtems_hdl_tbl[i]); BSP_irq_disable_at_i8259s (i); } } /* * must enable slave pic anyway */ BSP_irq_enable_at_i8259s (2); _CPU_ISR_Enable(level); return 1; } int BSP_rtems_irq_mngt_get(rtems_irq_global_settings** config) { *config = internal_config; return 0; } 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(); } /* * I plan to process other thread related events here. * This will include DEBUG session requested from keyboard... */ }