source: mainline/kernel/arch/ia32xen/src/smp/apic.c@ df4ed85

/*
 * Copyright (c) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup ia32xen 
 * @{
 */
/** @file
 */

#include <arch/types.h>
#include <arch/smp/apic.h>
#include <arch/smp/ap.h>
#include <arch/smp/mps.h>
#include <arch/boot/boot.h>
#include <mm/page.h>
#include <time/delay.h>
#include <interrupt.h>
#include <arch/interrupt.h>
#include <print.h>
#include <arch/asm.h>
#include <arch.h>

#ifdef CONFIG_SMP

/*
 * Advanced Programmable Interrupt Controller for SMP systems.
 * Tested on:
 *      Bochs 2.0.2 - Bochs 2.2.6 with 2-8 CPUs
 *      Simics 2.0.28 - Simics 2.2.19 2-15 CPUs
 *      VMware Workstation 5.5 with 2 CPUs
 *      QEMU 0.8.0 with 2-15 CPUs
 *      ASUS P/I-P65UP5 + ASUS C-P55T2D REV. 1.41 with 2x 200Mhz Pentium CPUs
 *      ASUS PCH-DL with 2x 3000Mhz Pentium 4 Xeon (HT) CPUs
 *      MSI K7D Master-L with 2x 2100MHz Athlon MP CPUs
 */

/*
 * These variables either stay configured as initilalized, or are changed by
 * the MP configuration code.
 *
 * Pay special attention to the volatile keyword. Without it, gcc -O2 would
 * optimize the code too much and accesses to l_apic and io_apic, that must
 * always be 32-bit, would use byte oriented instructions.
 */
volatile uint32_t *l_apic = (uint32_t *) 0xfee00000;
volatile uint32_t *io_apic = (uint32_t *) 0xfec00000;

uint32_t apic_id_mask = 0;

static int apic_poll_errors(void);

#ifdef LAPIC_VERBOSE
static char *delmod_str[] = {
        "Fixed",
        "Lowest Priority",
        "SMI",
        "Reserved",
        "NMI",
        "INIT",
        "STARTUP",
        "ExtInt"
};

static char *destmod_str[] = {
        "Physical",
        "Logical"
};

static char *trigmod_str[] = {
        "Edge",
        "Level"
};

static char *mask_str[] = {
        "Unmasked",
        "Masked"
};

static char *delivs_str[] = {
        "Idle",
        "Send Pending"
};

static char *tm_mode_str[] = {
        "One-shot",
        "Periodic"
};

static char *intpol_str[] = {
        "Polarity High",
        "Polarity Low"
};
#endif /* LAPIC_VERBOSE */


static void apic_spurious(int n, istate_t *istate);
static void l_apic_timer_interrupt(int n, istate_t *istate);

/** Initialize APIC on BSP. */
void apic_init(void)
{
        io_apic_id_t idreg;
        int i;

        exc_register(VECTOR_APIC_SPUR, "apic_spurious", (iroutine) apic_spurious);

        enable_irqs_function = io_apic_enable_irqs;
        disable_irqs_function = io_apic_disable_irqs;
        eoi_function = l_apic_eoi;
        
        /*
         * Configure interrupt routing.
         * IRQ 0 remains masked as the time signal is generated by l_apic's themselves.
         * Other interrupts will be forwarded to the lowest priority CPU.
         */
        io_apic_disable_irqs(0xffff);
        exc_register(VECTOR_CLK, "l_apic_timer", (iroutine) l_apic_timer_interrupt);
        for (i = 0; i < IRQ_COUNT; i++) {
                int pin;
        
                if ((pin = smp_irq_to_pin(i)) != -1) {
                        io_apic_change_ioredtbl(pin, DEST_ALL, IVT_IRQBASE+i, LOPRI);
                }
        }
        
        /*
         * Ensure that io_apic has unique ID.
         */
        idreg.value = io_apic_read(IOAPICID);
        if ((1<<idreg.apic_id) & apic_id_mask) {        /* see if IO APIC ID is used already */
                for (i = 0; i < APIC_ID_COUNT; i++) {
                        if (!((1<<i) & apic_id_mask)) {
                                idreg.apic_id = i;
                                io_apic_write(IOAPICID, idreg.value);
                                break;
                        }
                }
        }

        /*
         * Configure the BSP's lapic.
         */
        l_apic_init();

        l_apic_debug(); 
}

/** APIC spurious interrupt handler.
 *
 * @param n Interrupt vector.
 * @param istate Interrupted state.
 */
void apic_spurious(int n, istate_t *istate)
{
#ifdef CONFIG_DEBUG
        printf("cpu%d: APIC spurious interrupt\n", CPU->id);
#endif
}

/** Poll for APIC errors.
 *
 * Examine Error Status Register and report all errors found.
 *
 * @return 0 on error, 1 on success.
 */
int apic_poll_errors(void)
{
        esr_t esr;
        
        esr.value = l_apic[ESR];
        
        if (esr.send_checksum_error)
                printf("Send Checksum Error\n");
        if (esr.receive_checksum_error)
                printf("Receive Checksum Error\n");
        if (esr.send_accept_error)
                printf("Send Accept Error\n");
        if (esr.receive_accept_error)
                printf("Receive Accept Error\n");
        if (esr.send_illegal_vector)
                printf("Send Illegal Vector\n");
        if (esr.received_illegal_vector)
                printf("Received Illegal Vector\n");
        if (esr.illegal_register_address)
                printf("Illegal Register Address\n");

        return !esr.err_bitmap;
}

/** Send all CPUs excluding CPU IPI vector.
 *
 * @param vector Interrupt vector to be sent.
 *
 * @return 0 on failure, 1 on success.
 */
int l_apic_broadcast_custom_ipi(uint8_t vector)
{
        icr_t icr;

        icr.lo = l_apic[ICRlo];
        icr.delmod = DELMOD_FIXED;
        icr.destmod = DESTMOD_LOGIC;
        icr.level = LEVEL_ASSERT;
        icr.shorthand = SHORTHAND_ALL_EXCL;
        icr.trigger_mode = TRIGMOD_LEVEL;
        icr.vector = vector;

        l_apic[ICRlo] = icr.lo;

        icr.lo = l_apic[ICRlo];
        if (icr.delivs == DELIVS_PENDING) {
#ifdef CONFIG_DEBUG
                printf("IPI is pending.\n");
#endif
        }

        return apic_poll_errors();
}

/** Universal Start-up Algorithm for bringing up the AP processors.
 *
 * @param apicid APIC ID of the processor to be brought up.
 *
 * @return 0 on failure, 1 on success.
 */
int l_apic_send_init_ipi(uint8_t apicid)
{
        icr_t icr;
        int i;

        /*
         * Read the ICR register in and zero all non-reserved fields.
         */
        icr.lo = l_apic[ICRlo];
        icr.hi = l_apic[ICRhi];
        
        icr.delmod = DELMOD_INIT;
        icr.destmod = DESTMOD_PHYS;
        icr.level = LEVEL_ASSERT;
        icr.trigger_mode = TRIGMOD_LEVEL;
        icr.shorthand = SHORTHAND_NONE;
        icr.vector = 0;
        icr.dest = apicid;
        
        l_apic[ICRhi] = icr.hi;
        l_apic[ICRlo] = icr.lo;

        /*
         * According to MP Specification, 20us should be enough to
         * deliver the IPI.
         */
        delay(20);

        if (!apic_poll_errors())
                return 0;

        icr.lo = l_apic[ICRlo];
        if (icr.delivs == DELIVS_PENDING) {
#ifdef CONFIG_DEBUG
                printf("IPI is pending.\n");
#endif
        }

        icr.delmod = DELMOD_INIT;
        icr.destmod = DESTMOD_PHYS;
        icr.level = LEVEL_DEASSERT;
        icr.shorthand = SHORTHAND_NONE;
        icr.trigger_mode = TRIGMOD_LEVEL;
        icr.vector = 0;
        l_apic[ICRlo] = icr.lo;

        /*
         * Wait 10ms as MP Specification specifies.
         */
        delay(10000);

        if (!is_82489DX_apic(l_apic[LAVR])) {
                /*
                 * If this is not 82489DX-based l_apic we must send two STARTUP IPI's.
                 */
                for (i = 0; i<2; i++) {
                        icr.lo = l_apic[ICRlo];
                        icr.delmod = DELMOD_STARTUP;
                        icr.destmod = DESTMOD_PHYS;
                        icr.level = LEVEL_ASSERT;
                        icr.shorthand = SHORTHAND_NONE;
                        icr.trigger_mode = TRIGMOD_LEVEL;
                        l_apic[ICRlo] = icr.lo;
                        delay(200);
                }
        }
        
        return apic_poll_errors();
}

/** Initialize Local APIC. */
void l_apic_init(void)
{
        lvt_error_t error;
        lvt_lint_t lint;
        tpr_t tpr;
        svr_t svr;
        icr_t icr;
        tdcr_t tdcr;
        lvt_tm_t tm;
        ldr_t ldr;
        dfr_t dfr;
        uint32_t t1, t2;

        /* Initialize LVT Error register. */
        error.value = l_apic[LVT_Err];
        error.masked = true;
        l_apic[LVT_Err] = error.value;

        /* Initialize LVT LINT0 register. */
        lint.value = l_apic[LVT_LINT0];
        lint.masked = true;
        l_apic[LVT_LINT0] = lint.value;

        /* Initialize LVT LINT1 register. */
        lint.value = l_apic[LVT_LINT1];
        lint.masked = true;
        l_apic[LVT_LINT1] = lint.value;

        /* Task Priority Register initialization. */
        tpr.value = l_apic[TPR];
        tpr.pri_sc = 0;
        tpr.pri = 0;
        l_apic[TPR] = tpr.value;
        
        /* Spurious-Interrupt Vector Register initialization. */
        svr.value = l_apic[SVR];
        svr.vector = VECTOR_APIC_SPUR;
        svr.lapic_enabled = true;
        svr.focus_checking = true;
        l_apic[SVR] = svr.value;

        if (CPU->arch.family >= 6)
                enable_l_apic_in_msr();
        
        /* Interrupt Command Register initialization. */
        icr.lo = l_apic[ICRlo];
        icr.delmod = DELMOD_INIT;
        icr.destmod = DESTMOD_PHYS;
        icr.level = LEVEL_DEASSERT;
        icr.shorthand = SHORTHAND_ALL_INCL;
        icr.trigger_mode = TRIGMOD_LEVEL;
        l_apic[ICRlo] = icr.lo;
        
        /* Timer Divide Configuration Register initialization. */
        tdcr.value = l_apic[TDCR];
        tdcr.div_value = DIVIDE_1;
        l_apic[TDCR] = tdcr.value;

        /* Program local timer. */
        tm.value = l_apic[LVT_Tm];
        tm.vector = VECTOR_CLK;
        tm.mode = TIMER_PERIODIC;
        tm.masked = false;
        l_apic[LVT_Tm] = tm.value;

        /*
         * Measure and configure the timer to generate timer
         * interrupt with period 1s/HZ seconds.
         */
        t1 = l_apic[CCRT];
        l_apic[ICRT] = 0xffffffff;

        while (l_apic[CCRT] == t1)
                ;
                
        t1 = l_apic[CCRT];
        delay(1000000/HZ);
        t2 = l_apic[CCRT];
        
        l_apic[ICRT] = t1-t2;
        
        /* Program Logical Destination Register. */
        ldr.value = l_apic[LDR];
        if (CPU->id < sizeof(CPU->id)*8)        /* size in bits */
                ldr.id = (1<<CPU->id);
        l_apic[LDR] = ldr.value;
        
        /* Program Destination Format Register for Flat mode. */
        dfr.value = l_apic[DFR];
        dfr.model = MODEL_FLAT;
        l_apic[DFR] = dfr.value;
}

/** Local APIC End of Interrupt. */
void l_apic_eoi(void)
{
        l_apic[EOI] = 0;
}

/** Dump content of Local APIC registers. */
void l_apic_debug(void)
{
#ifdef LAPIC_VERBOSE
        lvt_tm_t tm;
        lvt_lint_t lint;
        lvt_error_t error;      
        
        printf("LVT on cpu%d, LAPIC ID: %d\n", CPU->id, l_apic_id());

        tm.value = l_apic[LVT_Tm];
        printf("LVT Tm: vector=%hhd, %s, %s, %s\n", tm.vector, delivs_str[tm.delivs], mask_str[tm.masked], tm_mode_str[tm.mode]);
        lint.value = l_apic[LVT_LINT0];
        printf("LVT LINT0: vector=%hhd, %s, %s, %s, irr=%d, %s, %s\n", tm.vector, delmod_str[lint.delmod], delivs_str[lint.delivs], intpol_str[lint.intpol], lint.irr, trigmod_str[lint.trigger_mode], mask_str[lint.masked]);
        lint.value = l_apic[LVT_LINT1]; 
        printf("LVT LINT1: vector=%hhd, %s, %s, %s, irr=%d, %s, %s\n", tm.vector, delmod_str[lint.delmod], delivs_str[lint.delivs], intpol_str[lint.intpol], lint.irr, trigmod_str[lint.trigger_mode], mask_str[lint.masked]);  
        error.value = l_apic[LVT_Err];
        printf("LVT Err: vector=%hhd, %s, %s\n", error.vector, delivs_str[error.delivs], mask_str[error.masked]);
#endif
}

/** Local APIC Timer Interrupt.
 *
 * @param n Interrupt vector number.
 * @param istate Interrupted state.
 */
void l_apic_timer_interrupt(int n, istate_t *istate)
{
        l_apic_eoi();
        clock();
}

/** Get Local APIC ID.
 *
 * @return Local APIC ID.
 */
uint8_t l_apic_id(void)
{
        l_apic_id_t idreg;
        
        idreg.value = l_apic[L_APIC_ID];
        return idreg.apic_id;
}

/** Read from IO APIC register.
 *
 * @param address IO APIC register address.
 *
 * @return Content of the addressed IO APIC register.
 */
uint32_t io_apic_read(uint8_t address)
{
        io_regsel_t regsel;
        
        regsel.value = io_apic[IOREGSEL];
        regsel.reg_addr = address;
        io_apic[IOREGSEL] = regsel.value;
        return io_apic[IOWIN];
}

/** Write to IO APIC register.
 *
 * @param address IO APIC register address.
 * @param x Content to be written to the addressed IO APIC register.
 */
void io_apic_write(uint8_t address, uint32_t x)
{
        io_regsel_t regsel;
        
        regsel.value = io_apic[IOREGSEL];
        regsel.reg_addr = address;
        io_apic[IOREGSEL] = regsel.value;
        io_apic[IOWIN] = x;
}

/** Change some attributes of one item in I/O Redirection Table.
 *
 * @param pin IO APIC pin number.
 * @param dest Interrupt destination address.
 * @param v Interrupt vector to trigger.
 * @param flags Flags.
 */
void io_apic_change_ioredtbl(int pin, int dest, uint8_t v, int flags)
{
        io_redirection_reg_t reg;
        int dlvr = DELMOD_FIXED;
        
        if (flags & LOPRI)
                dlvr = DELMOD_LOWPRI;

        reg.lo = io_apic_read(IOREDTBL + pin*2);
        reg.hi = io_apic_read(IOREDTBL + pin*2 + 1);
        
        reg.dest = dest;
        reg.destmod = DESTMOD_LOGIC;
        reg.trigger_mode = TRIGMOD_EDGE;
        reg.intpol = POLARITY_HIGH;
        reg.delmod = dlvr;
        reg.intvec = v;

        io_apic_write(IOREDTBL + pin*2, reg.lo);
        io_apic_write(IOREDTBL + pin*2 + 1, reg.hi);
}

/** Mask IRQs in IO APIC.
 *
 * @param irqmask Bitmask of IRQs to be masked (0 = do not mask, 1 = mask).
 */
void io_apic_disable_irqs(uint16_t irqmask)
{
        io_redirection_reg_t reg;
        int i, pin;
        
        for (i=0;i<16;i++) {
                if (irqmask & (1<<i)) {
                        /*
                         * Mask the signal input in IO APIC if there is a
                         * mapping for the respective IRQ number.
                         */
                        pin = smp_irq_to_pin(i);
                        if (pin != -1) {
                                reg.lo = io_apic_read(IOREDTBL + pin*2);
                                reg.masked = true;
                                io_apic_write(IOREDTBL + pin*2, reg.lo);
                        }
                        
                }
        }
}

/** Unmask IRQs in IO APIC.
 *
 * @param irqmask Bitmask of IRQs to be unmasked (0 = do not unmask, 1 = unmask).
 */
void io_apic_enable_irqs(uint16_t irqmask)
{
        int i, pin;
        io_redirection_reg_t reg;       
        
        for (i=0;i<16;i++) {
                if (irqmask & (1<<i)) {
                        /*
                         * Unmask the signal input in IO APIC if there is a
                         * mapping for the respective IRQ number.
                         */
                        pin = smp_irq_to_pin(i);
                        if (pin != -1) {
                                reg.lo = io_apic_read(IOREDTBL + pin*2);
                                reg.masked = false;
                                io_apic_write(IOREDTBL + pin*2, reg.lo);
                        }
                        
                }
        }
}

#endif /* CONFIG_SMP */

/** @}
 */