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/*
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/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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 * Copyright (C) 2001-2004 Jakub Jermar
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 * Copyright (C) 2005-2006 Ondrej Palkovsky
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 * All rights reserved.
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 * All rights reserved.
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 *
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * are met:
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        d->selector = gdtselector(KTEXT_DES);
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        d->selector = gdtselector(KTEXT_DES);
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        d->present = 1;
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        d->present = 1;
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        d->type = AR_INTERRUPT; /* masking interrupt */
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        d->type = AR_INTERRUPT; /* masking interrupt */
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        if (i == VECTOR_SYSCALL) {
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            /*
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             * The syscall interrupt gate must be calleable from userland.
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             */
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            d->dpl |= PL_USER;
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        }
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        idt_setoffset(d, ((__address) interrupt_handlers) + i*interrupt_handler_size);
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        idt_setoffset(d, ((__address) interrupt_handlers) + i*interrupt_handler_size);
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        exc_register(i, "undef", null_interrupt);
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        exc_register(i, "undef", (iroutine)null_interrupt);
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    }
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    }
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    exc_register(13, "gp_fault", gp_fault);
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    exc_register(13, "gp_fault", gp_fault);
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    exc_register( 7, "nm_fault", nm_fault);
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    exc_register( 7, "nm_fault", nm_fault);
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    exc_register(12, "ss_fault", ss_fault);
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    exc_register(12, "ss_fault", ss_fault);
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}
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}
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/* Clean IOPL(12,13) and NT(14) flags in EFLAGS register */
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static void clean_IOPL_NT_flags(void)
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{
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    asm
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    (
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        "pushfq;"
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        "pop %%rax;"
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        "and $~(0x7000),%%rax;"
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        "pushq %%rax;"
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        "popfq;"
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        :
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        :
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        :"%rax"
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    );
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}
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/* Clean AM(18) flag in CR0 register */
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/** Initialize segmentation - code/data/idt tables
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static void clean_AM_flag(void)
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{
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    asm
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    (
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 *
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        "mov %%cr0,%%rax;"
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        "and $~(0x40000),%%rax;"
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        "mov %%rax,%%cr0;"
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        :
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        :
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        :"%rax"
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    );
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 */
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}
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void pm_init(void)
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void pm_init(void)
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{
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{
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    struct descriptor *gdt_p = (struct descriptor *) gdtr.base;
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    struct descriptor *gdt_p = (struct descriptor *) gdtr.base;
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    struct tss_descriptor *tss_desc;
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    struct tss_descriptor *tss_desc;
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    /*
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    /*
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     * As of this moment, the current CPU has its own GDT pointing
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     * As of this moment, the current CPU has its own GDT pointing
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     * to its own TSS. We just need to load the TR register.
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     * to its own TSS. We just need to load the TR register.
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     */
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     */
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    __asm__("ltr %0" : : "r" ((__u16) gdtselector(TSS_DES)));
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    __asm__("ltr %0" : : "r" ((__u16) gdtselector(TSS_DES)));
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    clean_IOPL_NT_flags();    /* Disable I/O on nonprivileged levels */
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    clean_AM_flag();          /* Disable alignment check */
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}
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}