set_mtrr_var_ranges

Name:Set the MSR pair relating to a var range.* Returns true if changes are made.

Proto:static bool set_mtrr_var_ranges(unsigned int index, struct mtrr_var_range *vr)

Type:bool

Parameter:

Type	Parameter	Name
unsigned int	index
struct mtrr_var_range *	vr

661

bool changed = false

663

Access to machine-specific registers (available on 586 and better only)* Note: the rd* operations modify the parameters directly (without using* pointer indirection), this allows gcc to optimize better(MTRRphysBase_MSR(index), lo, hi)

664

If (base_lo & 0xfffff0ffUL) != (lo & 0xfffff0ffUL) || (base_hi & size_and_mask >> 32 - PAGE_SHIFT determines the page size ) != (hi & size_and_mask >> 32 - PAGE_SHIFT determines the page size ) Then

668

Doesn't attempt to pass an error out to MTRR users* because it's quite complicated in some cases and probably not* worth it because the best error handling is to ignore it.

669

changed = true

672

Access to machine-specific registers (available on 586 and better only)* Note: the rd* operations modify the parameters directly (without using* pointer indirection), this allows gcc to optimize better(MTRRphysMask_MSR(index), lo, hi)

674

If (mask_lo & 0xfffff800UL) != (lo & 0xfffff800UL) || (mask_hi & size_and_mask >> 32 - PAGE_SHIFT determines the page size ) != (hi & size_and_mask >> 32 - PAGE_SHIFT determines the page size ) Then

677

Doesn't attempt to pass an error out to MTRR users* because it's quite complicated in some cases and probably not* worth it because the best error handling is to ignore it.

678

changed = true

680

Return changed

**Caller**
Name	Describe
set_mtrr_state	set_mtrr_state - Set the MTRR state for this CPU.* NOTE: The CPU must already be in a safe state for MTRR changes.* RETURNS: 0 if no changes made, else a mask indicating what was changed.

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