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linux/include/asm-i386/apicdef.h
Vivek Goyal 1a75a3f068 [PATCH] i386 kdump timer vector lockup fix 
Porting the patch I posted for x86_64 to i386.

http://marc.theaimsgroup.com/?l=linux-kernel&m=114178139610707&w=2

o While using kdump, after a system crash when second kernel boots, timer
  vector gets (0x31) locked and CPU does not see timer interrupts
  travelling from IOAPIC to APIC.  Currently it does not lead to boot
  failure in second kernel as timer interrupts continues to come as ExtInt
  through LAPIC directly, but fixing it is good in case some boards do not
  support the other mode.

o After a system crash, it is not safe to service interrupts any more,
  hence interrupts are disabled.  This leads to pending interrupts at
  LAPIC.  LAPIC sends these interrupts to the CPU during early boot of
  second kernel.  Other pending interrupts are discarded saying unexpected
  trap but timer interrupt is serviced and CPU does not issue an LAPIC EOI
  because it think this interrupt came from i8259 and sends ack to 8259.
  This leads to vector 0x31 locking as LAPIC does not clear respective ISR
  and keeps on waiting for EOI.

o This patch issues extra EOI for the pending interrupts who have ISR set.

o Though today only timer seems to be the special case because in early
  boot it thinks interrupts are coming from i8259 and uses
  mask_and_ack_8259A() as ack handler and does not issue LAPIC EOI.  But
  probably doing it in generic manner for all vectors makes sense.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-31 12:18:50 -08:00

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#ifndef __ASM_APICDEF_H
#define __ASM_APICDEF_H
/*
* Constants for various Intel APICs. (local APIC, IOAPIC, etc.)
*
* Alan Cox <Alan.Cox@linux.org>, 1995.
* Ingo Molnar <mingo@redhat.com>, 1999, 2000
*/
#define APIC_DEFAULT_PHYS_BASE 0xfee00000
#define APIC_ID 0x20
#define APIC_LVR 0x30
#define APIC_LVR_MASK 0xFF00FF
#define GET_APIC_VERSION(x) ((x)&0xFF)
#define GET_APIC_MAXLVT(x) (((x)>>16)&0xFF)
#define APIC_INTEGRATED(x) ((x)&0xF0)
#define APIC_XAPIC(x) ((x) >= 0x14)
#define APIC_TASKPRI 0x80
#define APIC_TPRI_MASK 0xFF
#define APIC_ARBPRI 0x90
#define APIC_ARBPRI_MASK 0xFF
#define APIC_PROCPRI 0xA0
#define APIC_EOI 0xB0
#define APIC_EIO_ACK 0x0 /* Write this to the EOI register */
#define APIC_RRR 0xC0
#define APIC_LDR 0xD0
#define APIC_LDR_MASK (0xFF<<24)
#define GET_APIC_LOGICAL_ID(x) (((x)>>24)&0xFF)
#define SET_APIC_LOGICAL_ID(x) (((x)<<24))
#define APIC_ALL_CPUS 0xFF
#define APIC_DFR 0xE0
#define APIC_DFR_CLUSTER 0x0FFFFFFFul
#define APIC_DFR_FLAT 0xFFFFFFFFul
#define APIC_SPIV 0xF0
#define APIC_SPIV_FOCUS_DISABLED (1<<9)
#define APIC_SPIV_APIC_ENABLED (1<<8)
#define APIC_ISR 0x100
#define APIC_ISR_NR 0x8 /* Number of 32 bit ISR registers. */
#define APIC_TMR 0x180
#define APIC_IRR 0x200
#define APIC_ESR 0x280
#define APIC_ESR_SEND_CS 0x00001
#define APIC_ESR_RECV_CS 0x00002
#define APIC_ESR_SEND_ACC 0x00004
#define APIC_ESR_RECV_ACC 0x00008
#define APIC_ESR_SENDILL 0x00020
#define APIC_ESR_RECVILL 0x00040
#define APIC_ESR_ILLREGA 0x00080
#define APIC_ICR 0x300
#define APIC_DEST_SELF 0x40000
#define APIC_DEST_ALLINC 0x80000
#define APIC_DEST_ALLBUT 0xC0000
#define APIC_ICR_RR_MASK 0x30000
#define APIC_ICR_RR_INVALID 0x00000
#define APIC_ICR_RR_INPROG 0x10000
#define APIC_ICR_RR_VALID 0x20000
#define APIC_INT_LEVELTRIG 0x08000
#define APIC_INT_ASSERT 0x04000
#define APIC_ICR_BUSY 0x01000
#define APIC_DEST_LOGICAL 0x00800
#define APIC_DM_FIXED 0x00000
#define APIC_DM_LOWEST 0x00100
#define APIC_DM_SMI 0x00200
#define APIC_DM_REMRD 0x00300
#define APIC_DM_NMI 0x00400
#define APIC_DM_INIT 0x00500
#define APIC_DM_STARTUP 0x00600
#define APIC_DM_EXTINT 0x00700
#define APIC_VECTOR_MASK 0x000FF
#define APIC_ICR2 0x310
#define GET_APIC_DEST_FIELD(x) (((x)>>24)&0xFF)
#define SET_APIC_DEST_FIELD(x) ((x)<<24)
#define APIC_LVTT 0x320
#define APIC_LVTTHMR 0x330
#define APIC_LVTPC 0x340
#define APIC_LVT0 0x350
#define APIC_LVT_TIMER_BASE_MASK (0x3<<18)
#define GET_APIC_TIMER_BASE(x) (((x)>>18)&0x3)
#define SET_APIC_TIMER_BASE(x) (((x)<<18))
#define APIC_TIMER_BASE_CLKIN 0x0
#define APIC_TIMER_BASE_TMBASE 0x1
#define APIC_TIMER_BASE_DIV 0x2
#define APIC_LVT_TIMER_PERIODIC (1<<17)
#define APIC_LVT_MASKED (1<<16)
#define APIC_LVT_LEVEL_TRIGGER (1<<15)
#define APIC_LVT_REMOTE_IRR (1<<14)
#define APIC_INPUT_POLARITY (1<<13)
#define APIC_SEND_PENDING (1<<12)
#define APIC_MODE_MASK 0x700
#define GET_APIC_DELIVERY_MODE(x) (((x)>>8)&0x7)
#define SET_APIC_DELIVERY_MODE(x,y) (((x)&~0x700)|((y)<<8))
#define APIC_MODE_FIXED 0x0
#define APIC_MODE_NMI 0x4
#define APIC_MODE_EXTINT 0x7
#define APIC_LVT1 0x360
#define APIC_LVTERR 0x370
#define APIC_TMICT 0x380
#define APIC_TMCCT 0x390
#define APIC_TDCR 0x3E0
#define APIC_TDR_DIV_TMBASE (1<<2)
#define APIC_TDR_DIV_1 0xB
#define APIC_TDR_DIV_2 0x0
#define APIC_TDR_DIV_4 0x1
#define APIC_TDR_DIV_8 0x2
#define APIC_TDR_DIV_16 0x3
#define APIC_TDR_DIV_32 0x8
#define APIC_TDR_DIV_64 0x9
#define APIC_TDR_DIV_128 0xA
#define APIC_BASE (fix_to_virt(FIX_APIC_BASE))
#define MAX_IO_APICS 64
/*
* the local APIC register structure, memory mapped. Not terribly well
* tested, but we might eventually use this one in the future - the
* problem why we cannot use it right now is the P5 APIC, it has an
* errata which cannot take 8-bit reads and writes, only 32-bit ones ...
*/
#define u32 unsigned int
#define lapic ((volatile struct local_apic *)APIC_BASE)
struct local_apic {
/*000*/ struct { u32 __reserved[4]; } __reserved_01;
/*010*/ struct { u32 __reserved[4]; } __reserved_02;
/*020*/ struct { /* APIC ID Register */
u32 __reserved_1 : 24,
phys_apic_id : 4,
__reserved_2 : 4;
u32 __reserved[3];
} id;
/*030*/ const
struct { /* APIC Version Register */
u32 version : 8,
__reserved_1 : 8,
max_lvt : 8,
__reserved_2 : 8;
u32 __reserved[3];
} version;
/*040*/ struct { u32 __reserved[4]; } __reserved_03;
/*050*/ struct { u32 __reserved[4]; } __reserved_04;
/*060*/ struct { u32 __reserved[4]; } __reserved_05;
/*070*/ struct { u32 __reserved[4]; } __reserved_06;
/*080*/ struct { /* Task Priority Register */
u32 priority : 8,
__reserved_1 : 24;
u32 __reserved_2[3];
} tpr;
/*090*/ const
struct { /* Arbitration Priority Register */
u32 priority : 8,
__reserved_1 : 24;
u32 __reserved_2[3];
} apr;
/*0A0*/ const
struct { /* Processor Priority Register */
u32 priority : 8,
__reserved_1 : 24;
u32 __reserved_2[3];
} ppr;
/*0B0*/ struct { /* End Of Interrupt Register */
u32 eoi;
u32 __reserved[3];
} eoi;
/*0C0*/ struct { u32 __reserved[4]; } __reserved_07;
/*0D0*/ struct { /* Logical Destination Register */
u32 __reserved_1 : 24,
logical_dest : 8;
u32 __reserved_2[3];
} ldr;
/*0E0*/ struct { /* Destination Format Register */
u32 __reserved_1 : 28,
model : 4;
u32 __reserved_2[3];
} dfr;
/*0F0*/ struct { /* Spurious Interrupt Vector Register */
u32 spurious_vector : 8,
apic_enabled : 1,
focus_cpu : 1,
__reserved_2 : 22;
u32 __reserved_3[3];
} svr;
/*100*/ struct { /* In Service Register */
/*170*/ u32 bitfield;
u32 __reserved[3];
} isr [8];
/*180*/ struct { /* Trigger Mode Register */
/*1F0*/ u32 bitfield;
u32 __reserved[3];
} tmr [8];
/*200*/ struct { /* Interrupt Request Register */
/*270*/ u32 bitfield;
u32 __reserved[3];
} irr [8];
/*280*/ union { /* Error Status Register */
struct {
u32 send_cs_error : 1,
receive_cs_error : 1,
send_accept_error : 1,
receive_accept_error : 1,
__reserved_1 : 1,
send_illegal_vector : 1,
receive_illegal_vector : 1,
illegal_register_address : 1,
__reserved_2 : 24;
u32 __reserved_3[3];
} error_bits;
struct {
u32 errors;
u32 __reserved_3[3];
} all_errors;
} esr;
/*290*/ struct { u32 __reserved[4]; } __reserved_08;
/*2A0*/ struct { u32 __reserved[4]; } __reserved_09;
/*2B0*/ struct { u32 __reserved[4]; } __reserved_10;
/*2C0*/ struct { u32 __reserved[4]; } __reserved_11;
/*2D0*/ struct { u32 __reserved[4]; } __reserved_12;
/*2E0*/ struct { u32 __reserved[4]; } __reserved_13;
/*2F0*/ struct { u32 __reserved[4]; } __reserved_14;
/*300*/ struct { /* Interrupt Command Register 1 */
u32 vector : 8,
delivery_mode : 3,
destination_mode : 1,
delivery_status : 1,
__reserved_1 : 1,
level : 1,
trigger : 1,
__reserved_2 : 2,
shorthand : 2,
__reserved_3 : 12;
u32 __reserved_4[3];
} icr1;
/*310*/ struct { /* Interrupt Command Register 2 */
union {
u32 __reserved_1 : 24,
phys_dest : 4,
__reserved_2 : 4;
u32 __reserved_3 : 24,
logical_dest : 8;
} dest;
u32 __reserved_4[3];
} icr2;
/*320*/ struct { /* LVT - Timer */
u32 vector : 8,
__reserved_1 : 4,
delivery_status : 1,
__reserved_2 : 3,
mask : 1,
timer_mode : 1,
__reserved_3 : 14;
u32 __reserved_4[3];
} lvt_timer;
/*330*/ struct { /* LVT - Thermal Sensor */
u32 vector : 8,
delivery_mode : 3,
__reserved_1 : 1,
delivery_status : 1,
__reserved_2 : 3,
mask : 1,
__reserved_3 : 15;
u32 __reserved_4[3];
} lvt_thermal;
/*340*/ struct { /* LVT - Performance Counter */
u32 vector : 8,
delivery_mode : 3,
__reserved_1 : 1,
delivery_status : 1,
__reserved_2 : 3,
mask : 1,
__reserved_3 : 15;
u32 __reserved_4[3];
} lvt_pc;
/*350*/ struct { /* LVT - LINT0 */
u32 vector : 8,
delivery_mode : 3,
__reserved_1 : 1,
delivery_status : 1,
polarity : 1,
remote_irr : 1,
trigger : 1,
mask : 1,
__reserved_2 : 15;
u32 __reserved_3[3];
} lvt_lint0;
/*360*/ struct { /* LVT - LINT1 */
u32 vector : 8,
delivery_mode : 3,
__reserved_1 : 1,
delivery_status : 1,
polarity : 1,
remote_irr : 1,
trigger : 1,
mask : 1,
__reserved_2 : 15;
u32 __reserved_3[3];
} lvt_lint1;
/*370*/ struct { /* LVT - Error */
u32 vector : 8,
__reserved_1 : 4,
delivery_status : 1,
__reserved_2 : 3,
mask : 1,
__reserved_3 : 15;
u32 __reserved_4[3];
} lvt_error;
/*380*/ struct { /* Timer Initial Count Register */
u32 initial_count;
u32 __reserved_2[3];
} timer_icr;
/*390*/ const
struct { /* Timer Current Count Register */
u32 curr_count;
u32 __reserved_2[3];
} timer_ccr;
/*3A0*/ struct { u32 __reserved[4]; } __reserved_16;
/*3B0*/ struct { u32 __reserved[4]; } __reserved_17;
/*3C0*/ struct { u32 __reserved[4]; } __reserved_18;
/*3D0*/ struct { u32 __reserved[4]; } __reserved_19;
/*3E0*/ struct { /* Timer Divide Configuration Register */
u32 divisor : 4,
__reserved_1 : 28;
u32 __reserved_2[3];
} timer_dcr;
/*3F0*/ struct { u32 __reserved[4]; } __reserved_20;
} __attribute__ ((packed));
#undef u32
#endif
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