CS5535 datasheet(331/555 Pages) NSC

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5.9

PROGRAMMABLE INTERRUPT CONTROLLER REGISTER DESCRIPTIONS

The registers for the Programmable Interrupt Controller

(PIC) are divided into three sets:

• Standard GeodeLink Device MSRs (Shared with DIVIL,

see Section 5.6.1 on page 299.)

• PIC Specific MSRs

• PIC Native Registers

The MSRs are accessed via the RDMSR and WRMSR pro-

cessor instructions. The MSR address is derived from the

perspective of the CPU Core. See Section 3.2 "CS5535

MSR Addressing" on page 53 for more details on MSR

addressing.

All MSRs are 64 bits, however, the PIC Specific MSRs are

called out as 32 and 8 bits. The PIC treats writes to the

upper 32/56 bits (i.e., bits [63:32/63:8]) of the 64-bit MSRs

as don’t cares and always returns 0 on these bits.

The PIC Specific MSRs are also accessible in I/O space

via

MSR_LBAR_IRQ

(MSR

51400008h),

except

for

MSR_PIC_SHDW (MSR 51400034h

). See Section 5.6.2.1

"Local BAR - IRQ Mapper (DIVIL_LBAR_IRQ)" on page

307.

The Native registers associated with the PIC are summa-

rized in Table 5-23 on page 332 and are accessed as I/O

Addresses.

The reference column in the summary tables point to the

page where the register maps and bit descriptions are

listed.

Table 5-22. PIC Specific MSRs Summary

MSR Address

PIC I/O

Offset

Type

Reset Value

Reference

51400020h

00h

R/W

IRQ Mapper Unrestricted Y Select Low

(PIC_YSEL_LOW)

00000000h

Page 333

51400021h

04h

R/W

IRQ Mapper Unrestricted Y Select High

(PIC_YSEL_HIGH)

00000000h

Page 334

51400022h

08h

R/W

IRQ Mapper Unrestricted Z Select Low

(PIC_ZSEL_LOW)

00000000h

Page 333

51400023h

0Ch

R/W

IRQ Mapper Unrestricted Z Select High

(PIC_ZSEL_HIGH)

00000000h

Page 334

51400024h

10h

R/W

IRQ Mapper Primary Mask (PIC_IRQM_PRIM)

0000FFFFh

Page 334

51400025h

14h

R/W

IRQ Mapper LPC Mask (PIC_IRQM_LPC)

00000000h

Page 335

51400026h

18h

IRQ Mapper Extended Interrupt Request Status

Low (PIC_XIRR_STS_LOW)

xxxxxxxxh

Page 335

51400027h

1Ch

IRQ Mapper Extended Interrupt Request Status

High (PIC_XIRR_STS_HIGH)

xxxxxxxxh

Page 337

51400034h

---

PIC Shadow (PIC_SHDW)

xxh

Page 338

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