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Rev 3343 Rev 3743
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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#
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#include <arch/arch.h>
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#include <arch/arch.h>
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#include <arch/stack.h>
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#include <arch/stack.h>
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#include <arch/regdef.h>
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#include <arch/mm/mmu.h>
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.text
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.text
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.register       %g2, #scratch
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.register       %g2, #scratch
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.register       %g3, #scratch
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.register       %g3, #scratch
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memsetb:
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memsetb:
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	b _memsetb
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	b _memsetb
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	nop
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	nop
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.macro WRITE_ALTERNATE_REGISTER reg, bit
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	rdpr %pstate, %g1				! save PSTATE.PEF
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	wrpr %g0, (\bit | PSTATE_PRIV_BIT), %pstate
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	mov %o0, \reg
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	wrpr %g0, PSTATE_PRIV_BIT, %pstate
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	retl
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	wrpr %g1, 0, %pstate				! restore PSTATE.PEF
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.endm
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.macro READ_ALTERNATE_REGISTER reg, bit
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	rdpr %pstate, %g1				! save PSTATE.PEF
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	wrpr %g0, (\bit | PSTATE_PRIV_BIT), %pstate
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	mov \reg, %o0
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	wrpr %g0, PSTATE_PRIV_BIT, %pstate
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	retl
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	wrpr %g1, 0, %pstate				! restore PSTATE.PEF
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.endm
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.global write_to_ag_g6
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write_to_ag_g6:
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	WRITE_ALTERNATE_REGISTER %g6, PSTATE_AG_BIT
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.global write_to_ag_g7
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write_to_ag_g7:
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	WRITE_ALTERNATE_REGISTER %g7, PSTATE_AG_BIT
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.global write_to_ig_g6
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write_to_ig_g6:
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	WRITE_ALTERNATE_REGISTER %g6, PSTATE_IG_BIT
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.global read_from_ag_g7
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read_from_ag_g7:
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	READ_ALTERNATE_REGISTER %g7, PSTATE_AG_BIT
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/** Switch to userspace.
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 *
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 * %o0	Userspace entry address.
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 * %o1	Userspace stack pointer address.
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 * %o2  Userspace address of uarg structure.
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 */
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.global switch_to_userspace
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switch_to_userspace:
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	save %o1, -STACK_WINDOW_SAVE_AREA_SIZE, %sp
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	flushw
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	wrpr %g0, 0, %cleanwin		! avoid information leak
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	mov %i2, %o0			! uarg
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	xor %o1, %o1, %o1		! %o1 is defined to hold pcb_ptr
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					! set it to 0
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	clr %i2
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	clr %i3
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	clr %i4
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	clr %i5
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	clr %i6
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	wrpr %g0, 1, %tl		! enforce mapping via nucleus
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	rdpr %cwp, %g1
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	wrpr %g1, TSTATE_IE_BIT, %tstate
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	wrpr %i0, 0, %tnpc
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	/*
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	 * Set primary context according to secondary context.
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	 * Secondary context has been already installed by
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	 * higher-level functions.
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	 */
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	wr %g0, ASI_DMMU, %asi
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	ldxa [VA_SECONDARY_CONTEXT_REG] %asi, %g1
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	stxa %g1, [VA_PRIMARY_CONTEXT_REG] %asi
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	flush %i7
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	/*
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	 * Spills and fills will be handled by the userspace handlers.
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	 */
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	wrpr %g0, WSTATE_OTHER(0) | WSTATE_NORMAL(1), %wstate
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	done				! jump to userspace
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