Copyright(C) 1994,1995,1996,1997 Terumasa KODAKA , Takeshi KONO
■APIC (Advanced Programmable Interrupt Controller)
Target Multiprocessor Machines
Pentium processors with 75MHz or higher
Explanation o APIC is an interrupt controller for 32-bit OS, and handles
interrupts in a multiprocessor environment.
o APIC is used in one local unit for each CPU, and in the I/O unit that
manages interrupts from I/O. (Figure 1)
o Currently, there are no models in the PC-9800 series that have this APIC
(82489DX) installed as an I/O unit, but the Pentium processors (P54C, P55C)
with 75MHz or higher have a local APIC built into the CPU.
o The APIC function is not currently used in the PC-9800 series.
o You can determine whether a CPU has a local APIC by executing the CPUID
command with EAX=00000001h and checking whether bit 9 of the value obtained in
the EDX register is 1.
u When CPUID is 0521h, 0522h, or 0524h, in the P54C, you can disable the local
APIC built into the CPU by setting bit 4 of the TR12 register to 1.
Figure 1: Local Unit and I/O Unit
---------------------------------------------------------------------
+----------+ +----------+ +----------+
|Processor | |Processor | |Processor |
+----+-+---+ +----+-+---+ +----+-+---+
| | | | | |
Register| |PINT Register| |PINT Register| |PINT
Access | |PNMI Access | |PNMI Access | |PNMI
| | | | | |
+-----+-+----+ +-----+-+----+ +-----+-+----+
|APIC 82489DX| |APIC 82489DX| |APIC 82489DX|
|Local | |Local | |Local |
| Unit| | Unit| | Unit|
+------+-----+ +------+-----+ +------+-----+
| | |
| | | ICC bus
←-------+----------------+-------+--------+------------→
|
|ID=0
+-----------+ +------+-----+
|Various I/O+----|APIC 82489DX|
+-----------+ | I/O unit |
+------------+
---------------------------------------------------------------------
o The APIC is usually accessed by memory-mapped I/O. The local unit is mapped
to FEE00000h in the memory space. The I/O unit is mapped to FEC00000h. If
there are multiple I/O units, each APIC is mapped as shown in Table 1.
Table 1: I/O Unit Mapping Address
--------+-----------------------
Number | Address
--------+-----------------------
#0 | FEC00000h~
#1 | FEC01000h~
#2 | FEC02000h~
: | :
: | :
--------+-----------------------
Table 2: I/O Unit Register 1
---------------+-----+------------------------------------
Address [9:4] | R/W | Register Name
---------------+-----+------------------------------------
00 0000b |WRITE| I/O Register Select
00 0001b | R/W | I/O Windows Register
---------------+-----+------------------------------------
Table 3: I/O Unit Register 2
---------------+-----+------------------------------------
Address[7:0] | R/W | Register Name
---------------+-----+------------------------------------
00000000b | R/W | I/O Unit ID Register
00000001b |READ | Version Register
00010000b | R/W | Redirection Table[0](31:0)
00010001b | R/W | Redirection Table[0](63:32)
00010010b | R/W | Redirection Table[1](31:0)
00010011b | R/W | Redirection Table[1](63:32)
00010100b | R/W | Redirection Table[2](31:0)
00010101b | R/W | Redirection Table[2](63:32)
00010110b | R/W | Redirection Table[3](31:0)
00010111b | R/W | Redirection Table[3](63:32)
00011000b | R/W | Redirection Table[4](31:0)
00011001b | R/W | Redirection Table[4](63:32)
00011010b | R/W | Redirection Table[5](31:0)
00011011b | R/W | Redirection Table[5](63:32)
00011100b | R/W | Redirection Table[6](31:0)
00011101b | R/W | Redirection Table[6](63:32)
00011110b | R/W | Redirection Table[7](31:0)
00011111b | R/W | Redirection Table[7](63:32)
00100000b | R/W | Redirection Table[8](31:0)
00100001b | R/W | Redirection Table[8](63:32)
00100010b | R/W | Redirection Table[9](31:0)
00100011b | R/W | Redirection Table[9](63:32)
00100100b | R/W | Redirection Table[10](31:0)
00100101b | R/W | Redirection Table[10](63:32)
00100110b | R/W | Redirection Table[11](31:0)
00100111b | R/W | Redirection Table[11](63:32)
00101000b | R/W | Redirection Table[12](31:0)
00101001b | R/W | Redirection Table[12](63:32)
00101010b | R/W | Redirection Table[13](31:0)
00101011b | R/W | Redirection Table[13](63:32)
00101100b | R/W | Redirection Table[14](31:0)
00101101b | R/W | Redirection Table[14](63:32)
00101110b | R/W | Redirection Table[15](31:0)
00101111b | R/W | Redirection Table[15](63:32)
---------------+-----+------------------------------------
Table 4: Local Unit Registers
---------------+-----+------------------------------------
Address[9:4] | R/W | Register Name
---------------+-----+------------------------------------
000010b | R/W | Local Unit ID Register
000011b |READ | Version Register
000100b | | Reserved
000101b | | Reserved
000110b | | Reserved
000111b | | Reserved
001000b | R/W | Task Priority Register
001001b | | Reserved
001010b | | Reserved
001011b | R/W | EOI Register
001100b |READ | Remote Register
001101b | R/W | Logical Destination Register
001110b | R/W | Destination Format Register
001111b | R/W | Spurious Vector Register
010000b |READ | ISR(31:0)
010001b |READ | ISR(63:32)
010010b |READ | ISR(95:64)
010011b |READ | ISR(127:96)
010100b |READ | ISR(159:128)
010101b |READ | ISR(191:160)
010110b |READ | ISR(223:192)
010111b |READ | ISR(255:224)
011000b |READ | TMR(31:0)
011001b |READ | TMR(63:32)
011010b |READ | TMR(95:64)
011011b |READ | TMR(127:96)
011100b |READ | TMR(159:128)
011101b |READ | TMR(191:160)
011110b |READ | TMR(223:192)
011111b |READ | TMR(255:224)
100000b |READ | IRR(31:0)
100001b |READ | IRR(63:32)
100010b |READ | IRR(95:64)
100011b |READ | IRR(127:96)
100100b |READ | IRR(159:128)
100101b |READ | IRR(191:160)
100110b |READ | IRR(223:192)
100111b |READ | IRR(255:224)
101000～101111b| | Reserved
110000b | R/W | Interrupt Command Register(31:0)
110001b | R/W | Interrupt Command Register(63:32)
110010b | R/W | Local Vector Table[Timer]
110011b | | Reserved
110100b | | Reserved
110101b | R/W | Local Vector Table[Local int 0]
110110b | R/W | Local Vector Table[Local int 1]
110111b | | Reserved
111000b | R/W | Initial Count Register
111010b |READ | Current Count Register
111011b | | Reserved
111100b | | Reserved
111101b | | Reserved
111110b | R/W | Divider Configuration Register
111111b | | Reserved
---------------+-----+------------------------------------