Ignore:
Timestamp:
Jun 29, 2017, 9:54:01 AM (5 years ago)
Author:
max@…
Message:

Parse the IOAPIC structure in ACPI, map the IOAPIC, and enable
the keyboard interrupt. Its queue is not flushed yet.

File:
1 edited

Legend:

Unmodified
Added
Removed
  • trunk/hal/x86_64/core/hal_apic.c

    r86 r89  
    5050        out8(PIC1_DATA, 0xff);
    5151        out8(PIC2_DATA, 0xff);
     52}
     53
     54/* -------------------------------------------------------------------------- */
     55
     56paddr_t ioapic_pa __in_kdata = 0;
     57vaddr_t ioapic_va __in_kdata = 0;
     58
     59#define IRQ_TIMER       0x00
     60#define IRQ_KEYBOARD    0x01
     61#define IRQ_COM2        0x03
     62#define IRQ_COM1        0x04
     63#define IRQ_FLOPPY      0x06
     64#define IRQ_ATA0        0x0e
     65#define IRQ_ATA1        0x0f
     66
     67#define IOREGSEL        0x00
     68#define IOWIN   0x10
     69
     70#define IOAPICID        0x00
     71#define IOAPICVER       0x01
     72#define IOAPICARB       0x02
     73#define IOREDTBL        0x10
     74
     75#define IOENTRY_DISABLE 0x10000
     76
     77void hal_ioapic_write(uint8_t reg, uint32_t val)
     78{
     79        *((volatile uint32_t *)((uint8_t *)ioapic_va + IOREGSEL)) = reg;
     80        *((volatile uint32_t *)((uint8_t *)ioapic_va + IOWIN)) = val;
     81}
     82
     83uint32_t hal_ioapic_read(uint8_t reg)
     84{
     85        *((volatile uint32_t *)((uint8_t *)ioapic_va + IOREGSEL)) = reg;
     86        return *((volatile uint32_t *)((uint8_t *)ioapic_va + IOWIN));
     87}
     88
     89void hal_ioapic_set_entry(uint8_t index, uint64_t data)
     90{
     91        hal_ioapic_write(IOREDTBL + index * 2, (uint32_t)(data & 0xFFFFFFFF));
     92        hal_ioapic_write(IOREDTBL + index * 2 + 1, (uint32_t)(data >> 32));
     93}
     94
     95static void hal_ioapic_init()
     96{
     97        size_t i, pins;
     98        uint32_t ver;
     99
     100        ioapic_va = hal_gpt_bootstrap_valloc(1); // XXX: should be shared
     101
     102        hal_gpt_enter(ioapic_va, ioapic_pa, PG_V|PG_KW|PG_NX|PG_N);
     103
     104        ver = hal_ioapic_read(IOAPICVER);
     105        pins = ((ver >> 16) & 0xFF) + 1;
     106
     107        /* Explicitly disable (mask) each vector */
     108        for (i = 0; i < pins; i++) {
     109                hal_ioapic_set_entry(i, IOENTRY_DISABLE);
     110        }
     111
     112        /* Now, enable the keyboard */
     113        hal_ioapic_set_entry(IRQ_KEYBOARD, IOAPIC_KEYBOARD_VECTOR);
    52114}
    53115
     
    122184        /* Enable the LAPIC */
    123185        hal_lapic_init();
     186
     187        /* Enable the IOAPIC */
     188        hal_ioapic_init();
    124189}
    125190
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