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.global cpu_priority_high

.global cpu_priority_low

.global cpu_priority_restore

.global cpu_priority_read

.global cpu_read_dba

.global cpu_write_dba

.global cpu_read_cr2

## Set priority level high

#

# Disable interrupts and return previous

# EFLAGS in EAX.

#

cpu_priority_high:

	pushf

	pop %eax

	cli

	ret

## Set priority level low

#

# Enable interrupts and return previous

# EFLAGS in EAX.

#    

cpu_priority_low:

        pushf

	pop %eax

	sti

	ret

## Restore priority level

#

# Restore EFLAGS.

#

cpu_priority_restore:

	push 4(%esp)

	popf

	ret

## Return raw priority level

#

# Return EFLAFS in EAX.

#

cpu_priority_read:

	pushf

	pop %eax

	ret

## Halt the CPU

#

# Halt the CPU using HLT.

#

cpu_halt:

cpu_sleep:

	hlt

	ret

## Read CR3

#

# Store CR3 in EAX.

#

cpu_read_dba:

	movl %cr3,%eax

	ret

## Write CR3

#

# Set CR3.

#

cpu_write_dba:

	pushl %eax

	movl 8(%esp),%eax

	movl %eax,%cr3

	popl %eax

	ret

## Read CR2

#

# Store CR2 in EAX.

#

cpu_read_cr2:

	movl %cr2,%eax

	ret