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/*

 * 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.

 */

#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 __u32 *l_apic = (__u32 *) 0xfee00000;

volatile __u32 *io_apic = (__u32 *) 0xfec00000;

__u32 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 stack Interrupted stack.

 */

void apic_spurious(int n, istate_t *istate)

{

	printf("cpu%d: APIC spurious interrupt\n", CPU->id);

}

/** 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(__u8 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)

		printf("IPI is pending.\n");

	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(__u8 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)

		printf("IPI is pending.\n");

	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.vector = ((__address) ap_boot) / 4096; /* calculate the reset vector */

			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;

	__u32 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 stack Interrupted stack.

 */

void l_apic_timer_interrupt(int n, istate_t *istate)

{

	l_apic_eoi();

	clock();

}

/** Get Local APIC ID.

 *

 * @return Local APIC ID.

 */

__u8 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.

 */

__u32 io_apic_read(__u8 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 Content to be written to the addressed IO APIC register.

 */

void io_apic_write(__u8 address, __u32 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, __u8 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(__u16 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(__u16 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 */