| /* |
| * Copyright (c) 2009 Corey Tabaka |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining |
| * a copy of this software and associated documentation files |
| * (the "Software"), to deal in the Software without restriction, |
| * including without limitation the rights to use, copy, modify, merge, |
| * publish, distribute, sublicense, and/or sell copies of the Software, |
| * and to permit persons to whom the Software is furnished to do so, |
| * subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be |
| * included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| #include <sys/types.h> |
| #include <debug.h> |
| #include <err.h> |
| #include <reg.h> |
| #include <kernel/thread.h> |
| #include <platform/interrupts.h> |
| #include <arch/ops.h> |
| #include <arch/x86.h> |
| #include "platform_p.h" |
| #include <platform/pc.h> |
| |
| void x86_gpf_handler(struct x86_iframe *frame); |
| void x86_invop_handler(struct x86_iframe *frame); |
| void x86_unhandled_exception(struct x86_iframe *frame); |
| |
| #define PIC1 0x20 |
| #define PIC2 0xA0 |
| |
| #define ICW1 0x11 |
| #define ICW4 0x01 |
| |
| struct int_handler_struct { |
| int_handler handler; |
| void *arg; |
| }; |
| |
| static struct int_handler_struct int_handler_table[INT_VECTORS]; |
| |
| /* |
| * Cached IRQ mask (enabled/disabled) |
| */ |
| static uint8_t irqMask[2]; |
| |
| /* |
| * init the PICs and remap them |
| */ |
| static void map(uint32_t pic1, uint32_t pic2) |
| { |
| /* send ICW1 */ |
| outp(PIC1, ICW1); |
| outp(PIC2, ICW1); |
| |
| /* send ICW2 */ |
| outp(PIC1 + 1, pic1); /* remap */ |
| outp(PIC2 + 1, pic2); /* pics */ |
| |
| /* send ICW3 */ |
| outp(PIC1 + 1, 4); /* IRQ2 -> connection to slave */ |
| outp(PIC2 + 1, 2); |
| |
| /* send ICW4 */ |
| outp(PIC1 + 1, 5); |
| outp(PIC2 + 1, 1); |
| |
| /* disable all IRQs */ |
| outp(PIC1 + 1, 0xff); |
| outp(PIC2 + 1, 0xff); |
| |
| irqMask[0] = 0xff; |
| irqMask[1] = 0xff; |
| } |
| |
| static void enable(unsigned int vector, bool enable) |
| { |
| if (vector >= PIC1_BASE && vector < PIC1_BASE + 8) { |
| vector -= PIC1_BASE; |
| |
| uint8_t bit = 1 << vector; |
| |
| if (enable && (irqMask[0] & bit)) { |
| irqMask[0] = inp(PIC1 + 1); |
| irqMask[0] &= ~bit; |
| outp(PIC1 + 1, irqMask[0]); |
| irqMask[0] = inp(PIC1 + 1); |
| } else if (!enable && !(irqMask[0] & bit)) { |
| irqMask[0] = inp(PIC1 + 1); |
| irqMask[0] |= bit; |
| outp(PIC1 + 1, irqMask[0]); |
| irqMask[0] = inp(PIC1 + 1); |
| } |
| } else if (vector >= PIC2_BASE && vector < PIC2_BASE + 8) { |
| vector -= PIC2_BASE; |
| |
| uint8_t bit = 1 << vector; |
| |
| if (enable && (irqMask[1] & bit)) { |
| irqMask[1] = inp(PIC2 + 1); |
| irqMask[1] &= ~bit; |
| outp(PIC2 + 1, irqMask[1]); |
| irqMask[1] = inp(PIC2 + 1); |
| } else if (!enable && !(irqMask[1] & bit)) { |
| irqMask[1] = inp(PIC2 + 1); |
| irqMask[1] |= bit; |
| outp(PIC2 + 1, irqMask[1]); |
| irqMask[1] = inp(PIC2 + 1); |
| } |
| |
| bit = 1 << (INT_PIC2 - PIC1_BASE); |
| |
| if (irqMask[1] != 0xff && (irqMask[0] & bit)) { |
| irqMask[0] = inp(PIC1 + 1); |
| irqMask[0] &= ~bit; |
| outp(PIC1 + 1, irqMask[0]); |
| irqMask[0] = inp(PIC1 + 1); |
| } else if (irqMask[1] == 0 && !(irqMask[0] & bit)) { |
| irqMask[0] = inp(PIC1 + 1); |
| irqMask[0] |= bit; |
| outp(PIC1 + 1, irqMask[0]); |
| irqMask[0] = inp(PIC1 + 1); |
| } |
| } else { |
| //dprintf(DEBUG, "Invalid PIC interrupt: %02x\n", vector); |
| } |
| } |
| |
| void issueEOI(unsigned int vector) |
| { |
| if (vector >= PIC1_BASE && vector <= PIC1_BASE + 7) { |
| outp(PIC1, 0x20); |
| } else if (vector >= PIC2_BASE && vector <= PIC2_BASE + 7) { |
| outp(PIC2, 0x20); |
| outp(PIC1, 0x20); // must issue both for the second PIC |
| } |
| } |
| |
| void platform_init_interrupts(void) |
| { |
| // rebase the PIC out of the way of processor exceptions |
| map(PIC1_BASE, PIC2_BASE); |
| } |
| |
| status_t mask_interrupt(unsigned int vector) |
| { |
| if (vector >= INT_VECTORS) |
| return ERR_INVALID_ARGS; |
| |
| // dprintf(DEBUG, "%s: vector %d\n", __PRETTY_FUNCTION__, vector); |
| |
| enter_critical_section(); |
| |
| enable(vector, false); |
| |
| exit_critical_section(); |
| |
| return NO_ERROR; |
| } |
| |
| |
| void platform_mask_irqs(void) |
| { |
| irqMask[0] = inp(PIC1 + 1); |
| irqMask[1] = inp(PIC2 + 1); |
| |
| outp(PIC1 + 1, 0xff); |
| outp(PIC2 + 1, 0xff); |
| |
| irqMask[0] = inp(PIC1 + 1); |
| irqMask[1] = inp(PIC2 + 1); |
| } |
| |
| status_t unmask_interrupt(unsigned int vector) |
| { |
| if (vector >= INT_VECTORS) |
| return ERR_INVALID_ARGS; |
| |
| // dprintf("%s: vector %d\n", __PRETTY_FUNCTION__, vector); |
| |
| enter_critical_section(); |
| |
| enable(vector, true); |
| |
| exit_critical_section(); |
| |
| return NO_ERROR; |
| } |
| |
| enum handler_return platform_irq(struct x86_iframe *frame) |
| { |
| // get the current vector |
| unsigned int vector = frame->vector; |
| |
| #if THREAD_STATS |
| thread_stats.interrupts++; |
| #endif |
| |
| // deliver the interrupt |
| enum handler_return ret = INT_NO_RESCHEDULE; |
| |
| switch (vector) { |
| case INT_GP_FAULT: |
| x86_gpf_handler(frame); |
| break; |
| |
| case INT_INVALID_OP: |
| x86_invop_handler(frame); |
| break; |
| |
| case INT_DIVIDE_0: |
| case INT_DEBUG_EX: |
| case INT_DEV_NA_EX: |
| case INT_PAGE_FAULT: |
| case INT_STACK_FAULT: |
| case 3: |
| x86_unhandled_exception(frame); |
| break; |
| |
| default: |
| if (int_handler_table[vector].handler) |
| ret = int_handler_table[vector].handler(int_handler_table[vector].arg); |
| } |
| |
| // ack the interrupt |
| issueEOI(vector); |
| |
| return ret; |
| } |
| |
| void register_int_handler(unsigned int vector, int_handler handler, void *arg) |
| { |
| if (vector >= INT_VECTORS) |
| panic("register_int_handler: vector out of range %d\n", vector); |
| |
| enter_critical_section(); |
| |
| int_handler_table[vector].arg = arg; |
| int_handler_table[vector].handler = handler; |
| |
| exit_critical_section(); |
| } |
| |
| |