Changeset 18baf9c0 in mainline for kernel/arch/sparc64/src/asm.S

Timestamp:

2009-11-20T17:14:32Z (15 years ago)

Author:

Pavel Rimsky <pavel@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

3da11f37

Parents:

5a4fef9

Message:

Sources forked into sun4u and sun4v versions such that sun4u and sun4v have separate switch_to_userspace routines.

File:

• kernel/arch/sparc64/src/asm.S (modified) (2 diffs)

kernel/arch/sparc64/src/asm.S

@@ -29 +29 @@
 #include <arch/arch.h>
 #include <arch/stack.h>
-#include <arch/regdef.h>
-#include <arch/mm/mmu.h>
 
 .text
@@ -234 +232 @@
         nop
 
-
-.macro WRITE_ALTERNATE_REGISTER reg, bit
-        rdpr %pstate, %g1                               ! save PSTATE.PEF
-        wrpr %g0, (\bit | PSTATE_PRIV_BIT), %pstate
-        mov %o0, \reg
-        wrpr %g0, PSTATE_PRIV_BIT, %pstate
-        retl
-        wrpr %g1, 0, %pstate                            ! restore PSTATE.PEF
-.endm
-
-.macro READ_ALTERNATE_REGISTER reg, bit
-        rdpr %pstate, %g1                               ! save PSTATE.PEF
-        wrpr %g0, (\bit | PSTATE_PRIV_BIT), %pstate
-        mov \reg, %o0
-        wrpr %g0, PSTATE_PRIV_BIT, %pstate
-        retl
-        wrpr %g1, 0, %pstate                            ! restore PSTATE.PEF
-.endm
-
-.global write_to_ag_g6
-write_to_ag_g6:
-        WRITE_ALTERNATE_REGISTER %g6, PSTATE_AG_BIT
-
-.global write_to_ag_g7
-write_to_ag_g7:
-        WRITE_ALTERNATE_REGISTER %g7, PSTATE_AG_BIT
-
-.global write_to_ig_g6
-write_to_ig_g6:
-        WRITE_ALTERNATE_REGISTER %g6, PSTATE_IG_BIT
-
-.global read_from_ag_g7
-read_from_ag_g7:
-        READ_ALTERNATE_REGISTER %g7, PSTATE_AG_BIT
-
-
-/** Switch to userspace.
- *
- * %o0  Userspace entry address.
- * %o1  Userspace stack pointer address.
- * %o2  Userspace address of uarg structure.
- */
-.global switch_to_userspace
-switch_to_userspace:
-        save %o1, -(STACK_WINDOW_SAVE_AREA_SIZE + STACK_ARG_SAVE_AREA_SIZE), %sp
-        flushw
-        wrpr %g0, 0, %cleanwin          ! avoid information leak
-
-        mov %i2, %o0                    ! uarg
-        xor %o1, %o1, %o1               ! %o1 is defined to hold pcb_ptr
-                                        ! set it to 0
-
-        clr %i2
-        clr %i3
-        clr %i4
-        clr %i5
-        clr %i6
-
-        wrpr %g0, 1, %tl                ! enforce mapping via nucleus
-
-        rdpr %cwp, %g1
-        wrpr %g1, TSTATE_IE_BIT, %tstate
-        wrpr %i0, 0, %tnpc
-        
-        /*
-         * Set primary context according to secondary context.
-         * Secondary context has been already installed by
-         * higher-level functions.
-         */
-        wr %g0, ASI_DMMU, %asi
-        ldxa [VA_SECONDARY_CONTEXT_REG] %asi, %g1
-        stxa %g1, [VA_PRIMARY_CONTEXT_REG] %asi
-        flush %i7
-
-        /*
-         * Spills and fills will be handled by the userspace handlers.
-         */
-        wrpr %g0, WSTATE_OTHER(0) | WSTATE_NORMAL(1), %wstate
-        
-        done                            ! jump to userspace
-