source: trunk/hal/x86_64/drivers/pic_apic.c @ 491

/*
 * pic_apic.c - APIC PIC driver implementation
 *
 * Copyright (c) 2017 Maxime Villard
 *
 * This file is part of ALMOS-MKH.
 *
 * ALMOS-MKH is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2.0 of the License.
 *
 * ALMOS-MKH is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <hal_kernel_types.h>
#include <chdev.h>
#include <pic_apic.h>
#include <errno.h>
#include <string.h>
#include <printk.h>

#include <hal_internal.h>
#include <hal_segmentation.h>
#include <hal_apic.h>

extern iopic_input_t iopic_input;

static void
idt_set_seg(struct idt_seg *seg, void *func, int ist, int type, int dpl, int sel)
{
        seg->gd_looffset = (uint64_t)func & 0xffff;
        seg->gd_selector = sel;
        seg->gd_ist = ist;
        seg->gd_type = type;
        seg->gd_dpl = dpl;
        seg->gd_p = 1;
        seg->gd_hioffset = (uint64_t)func >> 16;
        seg->gd_zero = 0;
        seg->gd_xx1 = 0;
        seg->gd_xx2 = 0;
        seg->gd_xx3 = 0;
}

/* -------------------------------------------------------------------------- */

extern uint8_t *idtstore;

void pic_apic_init(chdev_t *pic)
{
        /* XXX APIC already initialized earlier */
}

void pic_apic_extend_init(uint32_t *xcu_base)
{
        x86_panic((char *)__func__);
}

void pic_apic_bind_irq(lid_t lid, chdev_t *src_chdev)
{
        struct idt_seg seg, *idt;
        void *isr;
        int slot;

        /* get the source chdev functional type, channel, and direction */
        uint32_t func    = src_chdev->func;
        uint32_t channel = src_chdev->channel;

        /* get external IRQ index */
        uint32_t irq_id;
        if (func == DEV_FUNC_IOC)
                irq_id = iopic_input.ioc[channel];
        else if (func == DEV_FUNC_TXT)
                irq_id = iopic_input.txt[channel];
        else
                assert(false, __FUNCTION__, "unsupported device\n");

        /* get the ISR pointer */
        isr = src_chdev->isr;

        /* create the IDT entry, and register it */
        idt_set_seg(&seg, isr, 0, SDT_SYS386IGT, SEL_KPL,
            GDT_FIXED_SEL(GDT_KCODE_SEL, SEL_KPL));
        slot = idt_slot_alloc();
        idt = (struct idt_seg *)&idtstore;
        memcpy(&idt[slot], &seg, sizeof(struct idt_seg));

        /* Bind the IRQ line in IOAPIC */
        hal_ioapic_bind_irq(irq_id, slot, lid);
}

void pic_apic_enable_irq(lid_t lid, xptr_t src_chdev_xp)
{
        chdev_t *src_chdev = (chdev_t *)src_chdev_xp;
        uint32_t func = src_chdev->func;
        uint32_t channel = src_chdev->channel;
        uint32_t irq_id;

        /* get external IRQ index */
        if (func == DEV_FUNC_IOC)
                irq_id = iopic_input.ioc[channel];
        else if (func == DEV_FUNC_TXT)
                irq_id = iopic_input.txt[channel];
        else
                assert(false, __FUNCTION__, "unsupported device\n");

        /* enable the line */
        hal_ioapic_enable_irq(irq_id);
}

void pic_apic_disable_irq(lid_t lid, xptr_t src_chdev_xp)
{
        chdev_t *src_chdev = (chdev_t *)src_chdev_xp;
        uint32_t func = src_chdev->func;
        uint32_t channel = src_chdev->channel;
        uint32_t irq_id;

        /* get external IRQ index */
        if (func == DEV_FUNC_IOC)
                irq_id = iopic_input.ioc[channel];
        else if (func == DEV_FUNC_TXT)
                irq_id = iopic_input.txt[channel];
        else
                assert(false, __FUNCTION__, "unsupported device\n");

        /* disable the line */
        hal_ioapic_disable_irq(irq_id);
}

void pic_apic_enable_timer(uint32_t period)
{
        /*
         * TODO: right now, we don't do anything, because the LAPIC is already
         * calibrated and launched earlier, mostly for debugging purposes. But it
         * would be good to launch it here for real.
         */
}

void pic_apic_enable_ipi( void )
{
        /* TODO */
//      x86_panic((char *)__func__);
}

void pic_apic_send_ipi(cxy_t cxy, lid_t lid)
{
        x86_panic((char *)__func__);
}