ref: 0ab5d34be4b8b9faa96d4691de95d6ae8c691f0b
dir: /sys/src/9/pc/apic.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "mp.h"
enum { /* Local APIC registers */
LapicID = 0x0020, /* ID */
LapicVER = 0x0030, /* Version */
LapicTPR = 0x0080, /* Task Priority */
LapicAPR = 0x0090, /* Arbitration Priority */
LapicPPR = 0x00A0, /* Processor Priority */
LapicEOI = 0x00B0, /* EOI */
LapicLDR = 0x00D0, /* Logical Destination */
LapicDFR = 0x00E0, /* Destination Format */
LapicSVR = 0x00F0, /* Spurious Interrupt Vector */
LapicISR = 0x0100, /* Interrupt Status (8 registers) */
LapicTMR = 0x0180, /* Trigger Mode (8 registers) */
LapicIRR = 0x0200, /* Interrupt Request (8 registers) */
LapicESR = 0x0280, /* Error Status */
LapicICRLO = 0x0300, /* Interrupt Command */
LapicICRHI = 0x0310, /* Interrupt Command [63:32] */
LapicTIMER = 0x0320, /* Local Vector Table 0 (TIMER) */
LapicPCINT = 0x0340, /* Performance Counter LVT */
LapicLINT0 = 0x0350, /* Local Vector Table 1 (LINT0) */
LapicLINT1 = 0x0360, /* Local Vector Table 2 (LINT1) */
LapicERROR = 0x0370, /* Local Vector Table 3 (ERROR) */
LapicTICR = 0x0380, /* Timer Initial Count */
LapicTCCR = 0x0390, /* Timer Current Count */
LapicTDCR = 0x03E0, /* Timer Divide Configuration */
};
enum { /* LapicSVR */
LapicENABLE = 0x00000100, /* Unit Enable */
LapicFOCUS = 0x00000200, /* Focus Processor Checking Disable */
};
enum { /* LapicICRLO */
/* [14] IPI Trigger Mode Level (RW) */
LapicDEASSERT = 0x00000000, /* Deassert level-sensitive interrupt */
LapicASSERT = 0x00004000, /* Assert level-sensitive interrupt */
/* [17:16] Remote Read Status */
LapicINVALID = 0x00000000, /* Invalid */
LapicWAIT = 0x00010000, /* In-Progress */
LapicVALID = 0x00020000, /* Valid */
/* [19:18] Destination Shorthand */
LapicFIELD = 0x00000000, /* No shorthand */
LapicSELF = 0x00040000, /* Self is single destination */
LapicALLINC = 0x00080000, /* All including self */
LapicALLEXC = 0x000C0000, /* All Excluding self */
};
enum { /* LapicESR */
LapicSENDCS = 0x00000001, /* Send CS Error */
LapicRCVCS = 0x00000002, /* Receive CS Error */
LapicSENDACCEPT = 0x00000004, /* Send Accept Error */
LapicRCVACCEPT = 0x00000008, /* Receive Accept Error */
LapicSENDVECTOR = 0x00000020, /* Send Illegal Vector */
LapicRCVVECTOR = 0x00000040, /* Receive Illegal Vector */
LapicREGISTER = 0x00000080, /* Illegal Register Address */
};
enum { /* LapicTIMER */
/* [17] Timer Mode (RW) */
LapicONESHOT = 0x00000000, /* One-shot */
LapicPERIODIC = 0x00020000, /* Periodic */
/* [19:18] Timer Base (RW) */
LapicCLKIN = 0x00000000, /* use CLKIN as input */
LapicTMBASE = 0x00040000, /* use TMBASE */
LapicDIVIDER = 0x00080000, /* use output of the divider */
};
static uchar lapictdxtab[] = { /* LapicTDCR */
0x0B, /* divide by 1 */
0x00, /* divide by 2 */
0x01, /* divide by 4 */
0x02, /* divide by 8 */
0x03, /* divide by 16 */
0x08, /* divide by 32 */
0x09, /* divide by 64 */
0x0A, /* divide by 128 */
};
static ulong* lapicbase;
typedef struct Apictimer Apictimer;
struct Apictimer
{
uvlong hz;
ulong max;
ulong min;
ulong div;
int tdx;
};
static Apictimer lapictimer[MAXMACH];
static ulong
lapicr(int r)
{
return *(lapicbase+(r/sizeof(*lapicbase)));
}
static void
lapicw(int r, ulong data)
{
*(lapicbase+(r/sizeof(*lapicbase))) = data;
data = *(lapicbase+(LapicID/sizeof(*lapicbase)));
USED(data);
}
void
lapiconline(void)
{
Apictimer *a;
a = &lapictimer[m->machno];
/*
* Reload the timer to de-synchronise the processors,
* then lower the task priority to allow interrupts to be
* accepted by the APIC.
*/
microdelay((TK2MS(1)*1000/conf.nmach) * m->machno);
lapicw(LapicTICR, a->max);
lapicw(LapicTIMER, LapicCLKIN|LapicPERIODIC|(VectorPIC+IrqTIMER));
/*
* not strickly neccesary, but reported (osdev.org) to be
* required for some machines.
*/
lapicw(LapicTDCR, lapictdxtab[a->tdx]);
lapicw(LapicTPR, 0);
}
/*
* use the i8253 clock to figure out our lapic timer rate.
*/
static void
lapictimerinit(void)
{
uvlong x, v, hz;
Apictimer *a;
int s;
s = splhi();
a = &lapictimer[m->machno];
a->tdx = 0;
Retry:
lapicw(LapicTIMER, ApicIMASK|LapicCLKIN|LapicONESHOT|(VectorPIC+IrqTIMER));
lapicw(LapicTDCR, lapictdxtab[a->tdx]);
x = fastticks(&hz);
x += hz/10;
lapicw(LapicTICR, 0xffffffff);
do{
v = fastticks(nil);
}while(v < x);
v = (0xffffffffUL-lapicr(LapicTCCR))*10;
if(v > hz-(hz/10)){
if(v > hz+(hz/10) && a->tdx < nelem(lapictdxtab)-1){
a->tdx++;
goto Retry;
}
v = hz;
}
assert(v >= (100*HZ));
a->hz = v;
a->div = hz/a->hz;
a->max = a->hz/HZ;
a->min = a->hz/(100*HZ);
splx(s);
v = (v+500000LL)/1000000LL;
print("cpu%d: lapic clock at %lludMHz\n", m->machno, v);
}
void
lapicinit(Apic* apic)
{
ulong dfr, ldr, lvt;
if(lapicbase == 0)
lapicbase = apic->addr;
/*
* These don't really matter in Physical mode;
* set the defaults anyway.
*/
if(strncmp(m->cpuidid, "AuthenticAMD", 12) == 0)
dfr = 0xf0000000;
else
dfr = 0xffffffff;
ldr = 0x00000000;
lapicw(LapicDFR, dfr);
lapicw(LapicLDR, ldr);
lapicw(LapicTPR, 0xff);
lapicw(LapicSVR, LapicENABLE|(VectorPIC+IrqSPURIOUS));
lapictimerinit();
/*
* Some Pentium revisions have a bug whereby spurious
* interrupts are generated in the through-local mode.
*/
switch(m->cpuidax & 0xFFF){
case 0x526: /* stepping cB1 */
case 0x52B: /* stepping E0 */
case 0x52C: /* stepping cC0 */
wrmsr(0x0E, 1<<14); /* TR12 */
break;
}
/*
* Set the local interrupts. It's likely these should just be
* masked off for SMP mode as some Pentium Pros have problems if
* LINT[01] are set to ExtINT.
* Acknowledge any outstanding interrupts.
lapicw(LapicLINT0, apic->lintr[0]);
lapicw(LapicLINT1, apic->lintr[1]);
*/
lapiceoi(0);
lvt = (lapicr(LapicVER)>>16) & 0xFF;
if(lvt >= 4)
lapicw(LapicPCINT, ApicIMASK);
lapicw(LapicERROR, VectorPIC+IrqERROR);
lapicw(LapicESR, 0);
lapicr(LapicESR);
/*
* Issue an INIT Level De-Assert to synchronise arbitration ID's.
*/
lapicw(LapicICRHI, 0);
lapicw(LapicICRLO, LapicALLINC|ApicLEVEL|LapicDEASSERT|ApicINIT);
while(lapicr(LapicICRLO) & ApicDELIVS)
;
/*
* Do not allow acceptance of interrupts until all initialisation
* for this processor is done. For the bootstrap processor this can be
* early duing initialisation. For the application processors this should
* be after the bootstrap processor has lowered priority and is accepting
* interrupts.
lapicw(LapicTPR, 0);
*/
}
void
lapicstartap(Apic* apic, int v)
{
int i;
ulong crhi;
/* make apic's processor do a warm reset */
crhi = apic->apicno<<24;
lapicw(LapicICRHI, crhi);
lapicw(LapicICRLO, LapicFIELD|ApicLEVEL|LapicASSERT|ApicINIT);
microdelay(200);
lapicw(LapicICRLO, LapicFIELD|ApicLEVEL|LapicDEASSERT|ApicINIT);
delay(10);
/* assumes apic is not an 82489dx */
for(i = 0; i < 2; i++){
lapicw(LapicICRHI, crhi);
/* make apic's processor start at v in real mode */
lapicw(LapicICRLO, LapicFIELD|ApicEDGE|ApicSTARTUP|(v/BY2PG));
microdelay(200);
}
}
void
lapicerror(Ureg*, void*)
{
ulong esr;
lapicw(LapicESR, 0);
esr = lapicr(LapicESR);
switch(m->cpuidax & 0xFFF){
case 0x526: /* stepping cB1 */
case 0x52B: /* stepping E0 */
case 0x52C: /* stepping cC0 */
return;
}
print("cpu%d: lapicerror: 0x%8.8luX\n", m->machno, esr);
}
void
lapicspurious(Ureg*, void*)
{
print("cpu%d: lapicspurious\n", m->machno);
}
int
lapicisr(int v)
{
ulong isr;
isr = lapicr(LapicISR + (v/32));
return isr & (1<<(v%32));
}
int
lapiceoi(int v)
{
lapicw(LapicEOI, 0);
return v;
}
void
lapicicrw(ulong hi, ulong lo)
{
lapicw(LapicICRHI, hi);
lapicw(LapicICRLO, lo);
}
void
ioapicrdtr(Apic* apic, int sel, int* hi, int* lo)
{
ulong *iowin;
iowin = apic->addr+(0x10/sizeof(ulong));
sel = IoapicRDT + 2*sel;
lock(apic);
*apic->addr = sel+1;
if(hi)
*hi = *iowin;
*apic->addr = sel;
if(lo)
*lo = *iowin;
unlock(apic);
}
void
ioapicrdtw(Apic* apic, int sel, int hi, int lo)
{
ulong *iowin;
iowin = apic->addr+(0x10/sizeof(ulong));
sel = IoapicRDT + 2*sel;
lock(apic);
*apic->addr = sel+1;
*iowin = hi;
*apic->addr = sel;
*iowin = lo;
unlock(apic);
}
void
ioapicinit(Apic* apic, int apicno)
{
int hi, lo, v;
ulong *iowin;
/*
* Initialise the I/O APIC.
* The MultiProcessor Specification says it is the responsibility
* of the O/S to set the APIC id.
* Make sure interrupts are all masked off for now.
*/
iowin = apic->addr+(0x10/sizeof(ulong));
lock(apic);
*apic->addr = IoapicVER;
apic->mre = (*iowin>>16) & 0xFF;
*apic->addr = IoapicID;
*iowin = apicno<<24;
unlock(apic);
hi = 0;
lo = ApicIMASK;
for(v = 0; v <= apic->mre; v++)
ioapicrdtw(apic, v, hi, lo);
}
void
lapictimerset(uvlong next)
{
vlong period;
Apictimer *a;
a = &lapictimer[m->machno];
period = next - fastticks(nil);
period /= a->div;
if(period < a->min)
period = a->min;
else if(period > a->max - a->min)
period = a->max;
lapicw(LapicTICR, period);
}
void
lapicclock(Ureg *u, void*)
{
/*
* since the MTRR updates need to be synchronized across processors,
* we want to do this within the clock tick.
*/
mtrrclock();
timerintr(u, 0);
}
void
lapicintron(void)
{
lapicw(LapicTPR, 0);
}
void
lapicintroff(void)
{
lapicw(LapicTPR, 0xFF);
}
void
lapicnmienable(void)
{
lapicw(LapicPCINT, ApicNMI);
}
void
lapicnmidisable(void)
{
lapicw(LapicPCINT, ApicIMASK);
}