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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.

 */

#ifdef __SMP__

#include <arch/mp.h>

#include <arch/ap.h>

#include <arch/pm.h>

#include <config.h>

#include <print.h>

#include <panic.h>

#include <arch/apic.h>

#include <func.h>

#include <arch/types.h>

#include <typedefs.h>

#include <synch/waitq.h>

#include <time/delay.h>

#include <mm/heap.h>

#include <mm/page.h>

#include <mm/frame.h>

#include <cpu.h>

#include <arch/i8259.h>

#include <arch/asm.h>

/*

 * Multi-Processor Specification detection code.

 */

#define	FS_SIGNATURE	0x5f504d5f

#define CT_SIGNATURE 	0x504d4350

int mp_fs_check(__u8 *base);

int mp_ct_check(void);

int configure_via_ct(void);

int configure_via_default(__u8 n);

int ct_processor_entry(struct __processor_entry *pr);

void ct_bus_entry(struct __bus_entry *bus);

void ct_io_apic_entry(struct __io_apic_entry *ioa);

void ct_io_intr_entry(struct __io_intr_entry *iointr);

void ct_l_intr_entry(struct __l_intr_entry *lintr);

void ct_extended_entries(void);

static struct __mpfs *fs;

static struct __mpct *ct;

struct __processor_entry *processor_entries = NULL;

struct __bus_entry *bus_entries = NULL;

struct __io_apic_entry *io_apic_entries = NULL;

struct __io_intr_entry *io_intr_entries = NULL;

struct __l_intr_entry *l_intr_entries = NULL;

int processor_entry_cnt = 0;

int bus_entry_cnt = 0;

int io_apic_entry_cnt = 0;

int io_intr_entry_cnt = 0;

int l_intr_entry_cnt = 0;

waitq_t ap_completion_wq;

waitq_t kmp_completion_wq;

/*

 * Used to check the integrity of the MP Floating Structure.

 */

int mp_fs_check(__u8 *base)

{

	int i;

	__u8 sum;

	for (i = 0, sum = 0; i < 16; i++)

		sum += base[i];

	return !sum;

}

/*

 * Used to check the integrity of the MP Configuration Table.

 */

int mp_ct_check(void)

{

	__u8 *base = (__u8 *) ct;

	__u8 *ext = base + ct->base_table_length;

	__u8 sum;

	int i;	

	/* count the checksum for the base table */

	for (i=0,sum=0; i < ct->base_table_length; i++)

		sum += base[i];

	if (sum)

		return 0;

	/* count the checksum for the extended table */

	for (i=0,sum=0; i < ct->ext_table_length; i++)

		sum += ext[i];

	return !sum;

}

void mp_init(void)

{

	__address addr, frame;

	int cnt, n;

	/*

	 * First place to search the MP Floating Pointer Structure is the Extended

	 * BIOS Data Area. We have to read EBDA segment address from the BIOS Data

	 * Area. Unfortunatelly, this memory is in page 0, which has intentionally no

	 * mapping.

	 */

	frame = frame_alloc(FRAME_KA);

	map_page_to_frame(frame,0,PAGE_CACHEABLE,0);

	addr = *((__u16 *) (frame + 0x40e)) * 16;

	map_page_to_frame(frame,frame,PAGE_CACHEABLE,0);

	frame_free(frame);	

	/*

	 * EBDA can be undefined. In that case addr would be 0. 

	 */

	if (addr >= 0x1000) {

		cnt = 1024;

		while (addr = __u32_search(addr,cnt,FS_SIGNATURE)) {

			if (mp_fs_check((__u8 *) addr))

				goto fs_found;

			addr++;

			cnt--;

		}

	}

	/*

	 * Second place where the MP Floating Pointer Structure may live is the last

	 * kilobyte of base memory.

	 */

	addr = 639*1024;

	cnt = 1024;

	while (addr = __u32_search(addr,cnt,FS_SIGNATURE)) {

		if (mp_fs_check((__u8 *) addr))

			goto fs_found;

		addr++;

		cnt--;

	}

	/*

	 * As the last resort, MP Floating Pointer Structure is searched in the BIOS

	 * ROM.

	 */

	addr = 0xf0000;

	cnt = 64*1024;

	while (addr = __u32_search(addr,cnt,FS_SIGNATURE)) {

		if (mp_fs_check((__u8 *) addr))

			goto fs_found;

		addr++;

		cnt--;

	}

	return;

fs_found:

	printf("%L: MP Floating Pointer Structure\n", addr);

	fs = (struct __mpfs *) addr;

	frame_not_free((__address) fs);

	if (fs->config_type == 0 && fs->configuration_table) {

		if (fs->mpfib2 >> 7) {

			printf("mp_init: PIC mode not supported\n");

			return;

		}

		ct = fs->configuration_table;

		frame_not_free((__address) ct);

		config.cpu_count = configure_via_ct();

	} 

	else

		config.cpu_count = configure_via_default(fs->config_type);

	if (config.cpu_count > 1) {

		map_page_to_frame((__address) l_apic, (__address) l_apic, PAGE_NOT_CACHEABLE, 0);

 	}		

	/*

	 * Must be initialized outside the kmp thread, since it is waited

	 * on before the kmp thread is created.

	 */

	waitq_initialize(&kmp_completion_wq);

	return;

}

int configure_via_ct(void)

{

	__u8 *cur;

	int i, cnt;

	if (ct->signature != CT_SIGNATURE) {

		printf("configure_via_ct: bad ct->signature\n");

		return 1;

	}

	if (!mp_ct_check()) {

		printf("configure_via_ct: bad ct checksum\n");

		return 1;

	}

	if (ct->oem_table) {

		printf("configure_via_ct: ct->oem_table not supported\n");

		return 1;

	}

	l_apic = ct->l_apic;

	cnt = 0;

	cur = &ct->base_table[0];

	for (i=0; i < ct->entry_count; i++) {

		switch (*cur) {

			/* Processor entry */

			case 0:	

				processor_entries = processor_entries ? processor_entries : (struct __processor_entry *) cur;

				processor_entry_cnt++;

				cnt += ct_processor_entry((struct __processor_entry *) cur);

				cur += 20;

				break;

			/* Bus entry */

			case 1:

				bus_entries = bus_entries ? bus_entries : (struct __bus_entry *) cur;

				bus_entry_cnt++;

				ct_bus_entry((struct __bus_entry *) cur);

				cur += 8;

				break;

			/* I/O Apic */

			case 2:

				io_apic_entries = io_apic_entries ? io_apic_entries : (struct __io_apic_entry *) cur;

				io_apic_entry_cnt++;

				ct_io_apic_entry((struct __io_apic_entry *) cur);

				cur += 8;

				break;

			/* I/O Interrupt Assignment */

			case 3:

				io_intr_entries = io_intr_entries ? io_intr_entries : (struct __io_intr_entry *) cur;

				io_intr_entry_cnt++;

				ct_io_intr_entry((struct __io_intr_entry *) cur);

				cur += 8;

				break;

			/* Local Interrupt Assignment */

			case 4:

				l_intr_entries = l_intr_entries ? l_intr_entries : (struct __l_intr_entry *) cur;

				l_intr_entry_cnt++;

				ct_l_intr_entry((struct __l_intr_entry *) cur);

		    		cur += 8;

				break;

			default:

				/*

				 * Something is wrong. Fallback to UP mode.

				 */

				printf("configure_via_ct: ct badness\n");

				return 1;

		}

	}

	/*

	 * Process extended entries.

	 */

	ct_extended_entries();

	return cnt;

}

int configure_via_default(__u8 n)

{

	/*

	 * Not yet implemented.

	 */

	printf("configure_via_default: not supported\n");

	return 1;

}

int ct_processor_entry(struct __processor_entry *pr)

{

	/*

	 * Ignore processors which are not marked enabled.

	 */

	if ((pr->cpu_flags & (1<<0)) == 0)

		return 0;

	apic_id_mask |= (1<<pr->l_apic_id); 

	return 1;

}

void ct_bus_entry(struct __bus_entry *bus)

{

#ifdef MPCT_VERBOSE

	char buf[7];

	memcopy((__address) bus->bus_type, (__address) buf,6);

	buf[6] = 0;

	printf("bus%d: %s\n", bus->bus_id, buf);

#endif

}

void ct_io_apic_entry(struct __io_apic_entry *ioa)

{

	static int io_apic_count = 0;

	/* this ioapic is marked unusable */

	if (ioa->io_apic_flags & 1 == 0)

		return;

	if (io_apic_count++ > 0) {

		/*

		 * Multiple IO APIC's are currently not supported.

		 */

		return;

	}

	map_page_to_frame((__address) ioa->io_apic, (__address) ioa->io_apic, PAGE_NOT_CACHEABLE, 0);

	io_apic = ioa->io_apic;

}

//#define MPCT_VERBOSE

void ct_io_intr_entry(struct __io_intr_entry *iointr)

{

#ifdef MPCT_VERBOSE

	switch (iointr->intr_type) {

	    case 0: printf("INT"); break;

	    case 1: printf("NMI"); break;

	    case 2: printf("SMI"); break;

	    case 3: printf("ExtINT"); break;

	}

	putchar(',');

	switch (iointr->poel&3) {

	    case 0: printf("bus-like"); break;

	    case 1: printf("active high"); break;

	    case 2: printf("reserved"); break;

	    case 3: printf("active low"); break;

	}

	putchar(',');

	switch ((iointr->poel>>2)&3) {

	    case 0: printf("bus-like"); break;

	    case 1: printf("edge-triggered"); break;

	    case 2: printf("reserved"); break;

	    case 3: printf("level-triggered"); break;

	}

	putchar(',');

	printf("bus%d,irq%d", iointr->src_bus_id, iointr->src_bus_irq);

	putchar(',');

	printf("io_apic%d,pin%d", iointr->dst_io_apic_id, iointr->dst_io_apic_pin);

	putchar('\n');	

#endif

}

void ct_l_intr_entry(struct __l_intr_entry *lintr)

{

#ifdef MPCT_VERBOSE

	switch (lintr->intr_type) {

	    case 0: printf("INT"); break;

	    case 1: printf("NMI"); break;

	    case 2: printf("SMI"); break;

	    case 3: printf("ExtINT"); break;

	}

	putchar(',');

	switch (lintr->poel&3) {

	    case 0: printf("bus-like"); break;

	    case 1: printf("active high"); break;

	    case 2: printf("reserved"); break;

	    case 3: printf("active low"); break;

	}

	putchar(',');

	switch ((lintr->poel>>2)&3) {

	    case 0: printf("bus-like"); break;

	    case 1: printf("edge-triggered"); break;

	    case 2: printf("reserved"); break;

	    case 3: printf("level-triggered"); break;

	}

	putchar(',');

	printf("bus%d,irq%d", lintr->src_bus_id, lintr->src_bus_irq);

	putchar(',');

	printf("l_apic%d,pin%d", lintr->dst_l_apic_id, lintr->dst_l_apic_pin);

	putchar('\n');

#endif

}

void ct_extended_entries(void)

{

	/*

	 * Not yet implemented.

	 */

	if (ct->ext_table_length)

		panic("ct_extended_entries: not supported\n");

}

/*

 * Kernel thread for bringing up application processors. It becomes clear

 * that we need an arrangement like this (AP's being initialized by a kernel

 * thread), for a thread has its dedicated stack. (The stack used during the

 * BSP initialization (prior the very first call to scheduler()) will be used

 * as an initialization stack for each AP.)

 */

void kmp(void *arg)

{

	struct __processor_entry *pr;

	__address src, dst;

	__address frame;

	int i;

	waitq_initialize(&ap_completion_wq);

	/*

	 * Processor entries immediately follow the configuration table header.

	 */

	pr = processor_entries;

	/*

	 * Grab a frame and map its address to page 0. This is a hack which

	 * accesses data in frame 0. Note that page 0 is not present because

	 * of nil reference bug catching.

	 */

	frame = frame_alloc(FRAME_KA);

	map_page_to_frame(frame,0,PAGE_CACHEABLE,0);

	/*

	 * Set the warm-reset vector to the real-mode address of 4K-aligned ap_boot()

	 */

	*((__u16 *) (frame + 0x467+0)) =  ((__address) ap_boot) >> 4;	/* segment */

	*((__u16 *) (frame + 0x467+2)) =  0x0;	/* offset */

	/*

	 * Give back the borrowed frame and restore identity mapping for it.

	 */

	map_page_to_frame(frame,frame,PAGE_CACHEABLE,0);

	frame_free(frame);

	/*

	 * Save 0xa to address 0xf of the CMOS RAM.

	 * BIOS will not do the POST after the INIT signal.

	 */

	outb(0x70,0xf);

	outb(0x71,0xa);

	cpu_priority_high();

	pic_disable_irqs(0xffff);

	apic_init();

	for (i = 0; i < processor_entry_cnt; i++) {

		struct descriptor *gdt_new;

		/*

		 * Skip processors marked unusable.

		 */

		if (pr[i].cpu_flags & (1<<0) == 0)

			continue;

		/*

		 * The bootstrap processor is already up.

		 */

		if (pr[i].cpu_flags & (1<<1))

			continue;

		/*

		 * Prepare new GDT for CPU in question.

		 */

		if (!(gdt_new = (struct descriptor *) malloc(GDT_ITEMS*sizeof(struct descriptor))))

			panic(PANIC "couldn't allocate memory for GDT\n");

		memcopy(gdt, gdt_new, GDT_ITEMS*sizeof(struct descriptor));

		gdtr.base = (__address) gdt_new;

		if (l_apic_send_init_ipi(pr[i].l_apic_id)) {

			/*

		         * There may be just one AP being initialized at

			 * the time. After it comes completely up, it is

			 * supposed to wake us up.

		         */

			waitq_sleep(&ap_completion_wq);

			cpu_priority_high();

		}

		else {

			printf("INIT IPI for l_apic%d failed\n", pr[i].l_apic_id);

		}

	}

	/*

	 * Wakeup the kinit thread so that

	 * system initialization can go on.

	 */

	waitq_wakeup(&kmp_completion_wq, WAKEUP_FIRST);

}

int mp_irq_to_pin(int irq)

{

	int i;

	for(i=0;i<io_intr_entry_cnt;i++) {

		if (io_intr_entries[i].src_bus_irq == irq && io_intr_entries[i].intr_type == 0)

			return io_intr_entries[i].dst_io_apic_pin;

	}

	return -1;

}

#endif /* __SMP__ */