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/* SPDX-License-Identifier: GPL-2.0-only */
#include <assert.h>
#include <device/mmio.h>
#include <arch/ioapic.h>
#include <console/console.h>
#include <cpu/x86/lapic.h>
u32 io_apic_read(void *ioapic_base, u32 reg)
{
write32(ioapic_base, reg);
return read32(ioapic_base + 0x10);
}
void io_apic_write(void *ioapic_base, u32 reg, u32 value)
{
write32(ioapic_base, reg);
write32(ioapic_base + 0x10, value);
}
static void write_vector(void *ioapic_base, u8 vector, u32 high, u32 low)
{
io_apic_write(ioapic_base, vector * 2 + 0x10, low);
io_apic_write(ioapic_base, vector * 2 + 0x11, high);
printk(BIOS_SPEW, "IOAPIC: vector 0x%02x value 0x%08x 0x%08x\n",
vector, high, low);
}
static int ioapic_interrupt_count(void *ioapic_base)
{
/* Read the available number of interrupts. */
int ioapic_interrupts = (io_apic_read(ioapic_base, 0x01) >> 16) & 0xff;
if (!ioapic_interrupts || ioapic_interrupts == 0xff)
ioapic_interrupts = 23;
ioapic_interrupts += 1; /* Bits 23-16 specify the maximum redirection
entry, which is the number of interrupts
minus 1. */
printk(BIOS_DEBUG, "IOAPIC: %d interrupts\n", ioapic_interrupts);
return ioapic_interrupts;
}
static void clear_vectors(void *ioapic_base, u8 first, u8 last)
{
u32 low, high;
u8 i;
printk(BIOS_DEBUG, "IOAPIC: Clearing IOAPIC at %p\n", ioapic_base);
low = INT_DISABLED;
high = NONE;
for (i = first; i <= last; i++)
write_vector(ioapic_base, i, high, low);
if (io_apic_read(ioapic_base, 0x10) == 0xffffffff) {
printk(BIOS_WARNING, "IOAPIC not responding.\n");
return;
}
}
void clear_ioapic(void *ioapic_base)
{
clear_vectors(ioapic_base, 0, ioapic_interrupt_count(ioapic_base) - 1);
}
static void route_i8259_irq0(void *ioapic_base)
{
u32 bsp_lapicid = lapicid();
u32 low, high;
ASSERT(bsp_lapicid < 255);
printk(BIOS_DEBUG, "IOAPIC: Bootstrap Processor Local APIC = 0x%02x\n",
bsp_lapicid);
/* Enable Virtual Wire Mode. Should this be LOGICAL_DEST instead? */
low = INT_ENABLED | TRIGGER_EDGE | POLARITY_HIGH | PHYSICAL_DEST | ExtINT;
high = bsp_lapicid << (56 - 32);
write_vector(ioapic_base, 0, high, low);
if (io_apic_read(ioapic_base, 0x10) == 0xffffffff) {
printk(BIOS_WARNING, "IOAPIC not responding.\n");
return;
}
}
void set_ioapic_id(void *ioapic_base, u8 ioapic_id)
{
int i;
printk(BIOS_DEBUG, "IOAPIC: Initializing IOAPIC at %p\n",
ioapic_base);
if (ioapic_id) {
printk(BIOS_DEBUG, "IOAPIC: ID = 0x%02x\n", ioapic_id);
/* Set IOAPIC ID if it has been specified. */
io_apic_write(ioapic_base, 0x00,
(io_apic_read(ioapic_base, 0x00) & 0xf0ffffff) |
(ioapic_id << 24));
}
printk(BIOS_SPEW, "IOAPIC: Dumping registers\n");
for (i = 0; i < 3; i++)
printk(BIOS_SPEW, " reg 0x%04x: 0x%08x\n", i,
io_apic_read(ioapic_base, i));
}
u8 get_ioapic_id(void *ioapic_base)
{
return (io_apic_read(ioapic_base, 0x00) >> 24) & 0x0f;
}
u8 get_ioapic_version(void *ioapic_base)
{
return io_apic_read(ioapic_base, 0x01) & 0xff;
}
void setup_ioapic_helper(void *ioapic_base, u8 ioapic_id, bool irq_on_fsb,
bool enable_virtual_wire)
{
int first = 0, last;
set_ioapic_id(ioapic_base, ioapic_id);
if (irq_on_fsb) {
/*
* For the Pentium 4 and above APICs deliver their interrupts
* on the front side bus, enable that.
*/
printk(BIOS_DEBUG, "IOAPIC: Enabling interrupts on FSB\n");
io_apic_write(ioapic_base, 0x03,
io_apic_read(ioapic_base, 0x03) | (1 << 0));
} else {
printk(BIOS_DEBUG,
"IOAPIC: Enabling interrupts on APIC serial bus\n");
io_apic_write(ioapic_base, 0x03, 0);
}
if (enable_virtual_wire) {
route_i8259_irq0(ioapic_base);
first = 1;
}
last = ioapic_interrupt_count(ioapic_base) - 1;
clear_vectors(ioapic_base, first, last);
}
void setup_ioapic(void *ioapic_base, u8 ioapic_id)
{
setup_ioapic_helper(ioapic_base, ioapic_id,
CONFIG(IOAPIC_INTERRUPTS_ON_FSB), true);
}
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