Intel IA-32 - Manual (Page 44)

1-8 Vol. 3A
ABOUT THIS MANUAL
1.3.7 Exceptions
An exception is an event that typically occurs when an instruction causes an error. For example,
an attempt to divide by zero generates an exception. However, some exceptions, such as break-
points, occur under other conditions. Some types of exceptions may provide error codes. An
error code reports additional information about the error. An example of the notation used to
show an exception and error code is shown below:
#PF(fault code)
This example refers to a page-fault exception under conditions where an error code naming a
type of fault is reported. Under some conditions, exceptions which produce error codes may not
Figure 1-2. Syntax for CPUID, CR, and MSR Data Presentation
Control Register Values
Model-Specific Register Values
Input value for EAX register
CPUID.01H:ECX.SSE [bit 25] = 1
Value (or range) of output
CPUID Input and Output
Output register and feature flag or field
name with bit position(s)
CR4.OSFXSR[bit 9] = 1
Feature flag or field name
with bit position(s)
Value (or range) of output
Example CR name
Feature flag or field name with bit position(s)
IA32_MISC_ENABLES.ENABLEFOPCODE[bit 2] = 1
Value (or range) of output
Example MSR name
OM17732