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/*

 * Copyright (C) 2005 Ondrej Palkovsky

 * 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.h>

#include <arch/types.h>

#include <config.h>

#include <proc/thread.h>

#include <arch/drivers/ega.h>

#include <arch/drivers/vesa.h>

#include <genarch/i8042/i8042.h>

#include <arch/drivers/i8254.h>

#include <arch/drivers/i8259.h>

#include <arch/bios/bios.h>

#include <arch/mm/memory_init.h>

#include <arch/cpu.h>

#include <print.h>

#include <arch/cpuid.h>

#include <genarch/acpi/acpi.h>

#include <panic.h>

#include <interrupt.h>

#include <arch/syscall.h>

#include <arch/debugger.h>

#include <syscall/syscall.h>

#include <console/console.h>

/** Disable I/O on non-privileged levels

 *

 * Clean IOPL(12,13) and NT(14) flags in EFLAGS register

 */

static void clean_IOPL_NT_flags(void)

{

	asm

	(

		"pushfq;"

		"pop %%rax;"

		"and $~(0x7000),%%rax;"

		"pushq %%rax;"

		"popfq;"

		:

		:

		:"%rax"

	);

}

/** Disable alignment check

 *

 * Clean AM(18) flag in CR0 register 

 */

static void clean_AM_flag(void)

{

	asm

	(

		"mov %%cr0,%%rax;"

		"and $~(0x40000),%%rax;"

		"mov %%rax,%%cr0;"

		:

		:

		:"%rax"

	);

}

void arch_pre_mm_init(void)

{

	struct cpu_info cpuid_s;

	cpuid(AMD_CPUID_EXTENDED,&cpuid_s);

	if (! (cpuid_s.cpuid_edx & (1<<AMD_EXT_NOEXECUTE)))

		panic("Processor does not support No-execute pages.\n");

	cpuid(INTEL_CPUID_STANDARD,&cpuid_s);

	if (! (cpuid_s.cpuid_edx & (1<<INTEL_FXSAVE)))

		panic("Processor does not support FXSAVE/FXRESTORE.\n");

	if (! (cpuid_s.cpuid_edx & (1<<INTEL_SSE2)))

		panic("Processor does not support SSE2 instructions.\n");

	/* Enable No-execute pages */

	set_efer_flag(AMD_NXE_FLAG);

	/* Enable FPU */

	cpu_setup_fpu();

	/* Initialize segmentation */

	pm_init();

        /* Disable I/O on nonprivileged levels

	 * clear the NT(nested-thread) flag 

	 */

	clean_IOPL_NT_flags();

	/* Disable alignment check */

	clean_AM_flag();

	if (config.cpu_active == 1) {

		bios_init();

		i8259_init();	/* PIC */

		i8254_init();	/* hard clock */

		#ifdef CONFIG_SMP

		exc_register(VECTOR_TLB_SHOOTDOWN_IPI, "tlb_shootdown",

			     tlb_shootdown_ipi);

		#endif /* CONFIG_SMP */

	}

}

void arch_post_mm_init(void)

{

	if (config.cpu_active == 1) {

#ifdef CONFIG_FB

		if (vesa_present()) 

			vesa_init();

		else

#endif

			ega_init();	/* video */

		/* Enable debugger */

		debugger_init();

		/* Merge all memory zones to 1 big zone */

		zone_merge_all();

	}

	/* Setup fast SYSCALL/SYSRET */

	syscall_setup_cpu();

}

void arch_pre_smp_init(void)

{

	if (config.cpu_active == 1) {

		memory_print_map();

		#ifdef CONFIG_SMP

		acpi_init();

		#endif /* CONFIG_SMP */

	}

}

void arch_post_smp_init(void)

{

	i8042_init();	/* keyboard controller */

}

void calibrate_delay_loop(void)

{

	i8254_calibrate_delay_loop();

	i8254_normal_operation();

}

/** Set thread-local-storage pointer

 *

 * TLS pointer is set in FS register. Unfortunately the 64-bit

 * part can be set only in CPL0 mode.

 *

 * The specs say, that on %fs:0 there is stored contents of %fs register,

 * we need not to go to CPL0 to read it.

 */

__native sys_tls_set(__native addr)

{

	THREAD->arch.tls = addr;

	write_msr(AMD_MSR_FS, addr);

	return 0;

}

/** Acquire console back for kernel

 *

 */

void arch_grab_console(void)

{

	i8042_grab();

}

/** Return console to userspace

 *

 */

void arch_release_console(void)

{

	i8042_release();

}