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#include <cpu/x86/lapic.h>
#include <console/console.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/mtrr.h>
void setup_lapic(void)
{
/* this is so interrupts work. This is very limited scope --
* linux will do better later, we hope ...
*/
/* this is the first way we learned to do it. It fails on real SMP
* stuff. So we have to do things differently ...
* see the Intel mp1.4 spec, page A-3
*/
#if NEED_LAPIC == 1
/* Only Pentium Pro and later have those MSR stuff */
msr_t msr;
printk_info("Setting up local apic...");
/* Enable the local apic */
msr = rdmsr(LAPIC_BASE_MSR);
msr.lo |= LAPIC_BASE_MSR_ENABLE;
msr.lo &= ~LAPIC_BASE_MSR_ADDR_MASK;
msr.lo |= LAPIC_DEFAULT_BASE;
wrmsr(LAPIC_BASE_MSR, msr);
/*
* Set Task Priority to 'accept all'.
*/
lapic_write_around(LAPIC_TASKPRI,
lapic_read_around(LAPIC_TASKPRI) & ~LAPIC_TPRI_MASK);
/* Put the local apic in virtual wire mode */
lapic_write_around(LAPIC_SPIV,
(lapic_read_around(LAPIC_SPIV) & ~(LAPIC_VECTOR_MASK))
| LAPIC_SPIV_ENABLE);
lapic_write_around(LAPIC_LVT0,
(lapic_read_around(LAPIC_LVT0) &
~(LAPIC_LVT_MASKED | LAPIC_LVT_LEVEL_TRIGGER |
LAPIC_LVT_REMOTE_IRR | LAPIC_INPUT_POLARITY |
LAPIC_SEND_PENDING |LAPIC_LVT_RESERVED_1 |
LAPIC_DELIVERY_MODE_MASK))
| (LAPIC_LVT_REMOTE_IRR |LAPIC_SEND_PENDING |
LAPIC_DELIVERY_MODE_EXTINT)
);
lapic_write_around(LAPIC_LVT1,
(lapic_read_around(LAPIC_LVT1) &
~(LAPIC_LVT_MASKED | LAPIC_LVT_LEVEL_TRIGGER |
LAPIC_LVT_REMOTE_IRR | LAPIC_INPUT_POLARITY |
LAPIC_SEND_PENDING |LAPIC_LVT_RESERVED_1 |
LAPIC_DELIVERY_MODE_MASK))
| (LAPIC_LVT_REMOTE_IRR |LAPIC_SEND_PENDING |
LAPIC_DELIVERY_MODE_NMI)
);
printk_debug(" apic_id: 0x%02lx ", lapicid());
#else /* !NEED_LLAPIC */
/* Only Pentium Pro and later have those MSR stuff */
msr_t msr;
printk_info("Disabling local apic...");
msr = rdmsr(LAPIC_BASE_MSR);
msr.lo &= ~LAPIC_BASE_MSR_ENABLE;
wrmsr(LAPIC_BASE_MSR, msr);
#endif /* !NEED_LAPIC */
printk_info("done.\n");
post_code(0x9b);
}
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