[SPARC64]: Sanitize %pstate writes for sun4v.

If we're just switching between different alternate global
sets, nop it out on sun4v.  Also, get rid of all of the
alternate global save/restore in the OBP CIF trampoline code.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 194 deletions

diff --git a/arch/sparc64/prom/cif.S b/arch/sparc64/prom/cif.S
index 29d0ae7..5f27ad7 100644
--- a/arch/sparc64/prom/cif.S
+++ b/arch/sparc64/prom/cif.S
@@ -1,10 +1,12 @@
 /* cif.S: PROM entry/exit assembler trampolines.
  *
- * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
- * Copyright (C) 2005 David S. Miller <davem@davemloft.net>
+ * Copyright (C) 1996, 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ * Copyright (C) 2005, 2006 David S. Miller <davem@davemloft.net>
  */
 
 #include <asm/pstate.h>
+#include <asm/cpudata.h>
+#include <asm/thread_info.h>
 
 	.text
 	.globl	prom_cif_interface
@@ -12,78 +14,16 @@ prom_cif_interface:
 	sethi	%hi(p1275buf), %o0
 	or	%o0, %lo(p1275buf), %o0
 	ldx	[%o0 + 0x010], %o1	! prom_cif_stack
-	save	%o1, -0x190, %sp
+	save	%o1, -192, %sp
 	ldx	[%i0 + 0x008], %l2	! prom_cif_handler
-	rdpr	%pstate, %l4
-	wrpr	%g0, 0x15, %pstate	! save alternate globals
-	stx	%g1, [%sp + 2047 + 0x0b0]
-	stx	%g2, [%sp + 2047 + 0x0b8]
-	stx	%g3, [%sp + 2047 + 0x0c0]
-	stx	%g4, [%sp + 2047 + 0x0c8]
-	stx	%g5, [%sp + 2047 + 0x0d0]
-	stx	%g6, [%sp + 2047 + 0x0d8]
-	stx	%g7, [%sp + 2047 + 0x0e0]
-	wrpr	%g0, 0x814, %pstate	! save interrupt globals
-	stx	%g1, [%sp + 2047 + 0x0e8]
-	stx	%g2, [%sp + 2047 + 0x0f0]
-	stx	%g3, [%sp + 2047 + 0x0f8]
-	stx	%g4, [%sp + 2047 + 0x100]
-	stx	%g5, [%sp + 2047 + 0x108]
-	stx	%g6, [%sp + 2047 + 0x110]
-	stx	%g7, [%sp + 2047 + 0x118]
-	wrpr	%g0, 0x14, %pstate	! save normal globals
-	stx	%g1, [%sp + 2047 + 0x120]
-	stx	%g2, [%sp + 2047 + 0x128]
-	stx	%g3, [%sp + 2047 + 0x130]
-	stx	%g4, [%sp + 2047 + 0x138]
-	stx	%g5, [%sp + 2047 + 0x140]
-	stx	%g6, [%sp + 2047 + 0x148]
-	stx	%g7, [%sp + 2047 + 0x150]
-	wrpr	%g0, 0x414, %pstate	! save mmu globals
-	stx	%g1, [%sp + 2047 + 0x158]
-	stx	%g2, [%sp + 2047 + 0x160]
-	stx	%g3, [%sp + 2047 + 0x168]
-	stx	%g4, [%sp + 2047 + 0x170]
-	stx	%g5, [%sp + 2047 + 0x178]
-	stx	%g6, [%sp + 2047 + 0x180]
-	stx	%g7, [%sp + 2047 + 0x188]
-	mov	%g1, %l0		! also save to locals, so we can handle
-	mov	%g2, %l1		! tlb faults later on, when accessing
-	mov	%g3, %l3		! the stack.
-	mov	%g7, %l5
-	wrpr	%l4, PSTATE_IE, %pstate	! turn off interrupts
+	mov	%g4, %l0
+	mov	%g5, %l1
+	mov	%g6, %l3
 	call	%l2
 	 add	%i0, 0x018, %o0		! prom_args
-	wrpr	%g0, 0x414, %pstate	! restore mmu globals
-	mov	%l0, %g1
-	mov	%l1, %g2
-	mov	%l3, %g3
-	mov	%l5, %g7
-	wrpr	%g0, 0x14, %pstate	! restore normal globals
-	ldx	[%sp + 2047 + 0x120], %g1
-	ldx	[%sp + 2047 + 0x128], %g2
-	ldx	[%sp + 2047 + 0x130], %g3
-	ldx	[%sp + 2047 + 0x138], %g4
-	ldx	[%sp + 2047 + 0x140], %g5
-	ldx	[%sp + 2047 + 0x148], %g6
-	ldx	[%sp + 2047 + 0x150], %g7
-	wrpr	%g0, 0x814, %pstate	! restore interrupt globals
-	ldx	[%sp + 2047 + 0x0e8], %g1
-	ldx	[%sp + 2047 + 0x0f0], %g2
-	ldx	[%sp + 2047 + 0x0f8], %g3
-	ldx	[%sp + 2047 + 0x100], %g4
-	ldx	[%sp + 2047 + 0x108], %g5
-	ldx	[%sp + 2047 + 0x110], %g6
-	ldx	[%sp + 2047 + 0x118], %g7
-	wrpr	%g0, 0x15, %pstate	! restore alternate globals
-	ldx	[%sp + 2047 + 0x0b0], %g1
-	ldx	[%sp + 2047 + 0x0b8], %g2
-	ldx	[%sp + 2047 + 0x0c0], %g3
-	ldx	[%sp + 2047 + 0x0c8], %g4
-	ldx	[%sp + 2047 + 0x0d0], %g5
-	ldx	[%sp + 2047 + 0x0d8], %g6
-	ldx	[%sp + 2047 + 0x0e0], %g7
-	wrpr	%l4, 0, %pstate	! restore original pstate
+	mov	%l0, %g4
+	mov	%l1, %g5
+	mov	%l3, %g6
 	ret
 	 restore
 
@@ -91,135 +31,18 @@ prom_cif_interface:
 prom_cif_callback:
 	sethi	%hi(p1275buf), %o1
 	or	%o1, %lo(p1275buf), %o1
-	save	%sp, -0x270, %sp
-	rdpr	%pstate, %l4
-	wrpr	%g0, 0x15, %pstate	! save PROM alternate globals
-	stx	%g1, [%sp + 2047 + 0x0b0]
-	stx	%g2, [%sp + 2047 + 0x0b8]
-	stx	%g3, [%sp + 2047 + 0x0c0]
-	stx	%g4, [%sp + 2047 + 0x0c8]
-	stx	%g5, [%sp + 2047 + 0x0d0]
-	stx	%g6, [%sp + 2047 + 0x0d8]
-	stx	%g7, [%sp + 2047 + 0x0e0]
-					! restore Linux alternate globals
-	ldx	[%sp + 2047 + 0x190], %g1
-	ldx	[%sp + 2047 + 0x198], %g2
-	ldx	[%sp + 2047 + 0x1a0], %g3
-	ldx	[%sp + 2047 + 0x1a8], %g4
-	ldx	[%sp + 2047 + 0x1b0], %g5
-	ldx	[%sp + 2047 + 0x1b8], %g6
-	ldx	[%sp + 2047 + 0x1c0], %g7
-	wrpr	%g0, 0x814, %pstate	! save PROM interrupt globals
-	stx	%g1, [%sp + 2047 + 0x0e8]
-	stx	%g2, [%sp + 2047 + 0x0f0]
-	stx	%g3, [%sp + 2047 + 0x0f8]
-	stx	%g4, [%sp + 2047 + 0x100]
-	stx	%g5, [%sp + 2047 + 0x108]
-	stx	%g6, [%sp + 2047 + 0x110]
-	stx	%g7, [%sp + 2047 + 0x118]
-					! restore Linux interrupt globals
-	ldx	[%sp + 2047 + 0x1c8], %g1
-	ldx	[%sp + 2047 + 0x1d0], %g2
-	ldx	[%sp + 2047 + 0x1d8], %g3
-	ldx	[%sp + 2047 + 0x1e0], %g4
-	ldx	[%sp + 2047 + 0x1e8], %g5
-	ldx	[%sp + 2047 + 0x1f0], %g6
-	ldx	[%sp + 2047 + 0x1f8], %g7
-	wrpr	%g0, 0x14, %pstate	! save PROM normal globals
-	stx	%g1, [%sp + 2047 + 0x120]
-	stx	%g2, [%sp + 2047 + 0x128]
-	stx	%g3, [%sp + 2047 + 0x130]
-	stx	%g4, [%sp + 2047 + 0x138]
-	stx	%g5, [%sp + 2047 + 0x140]
-	stx	%g6, [%sp + 2047 + 0x148]
-	stx	%g7, [%sp + 2047 + 0x150]
-					! restore Linux normal globals
-	ldx	[%sp + 2047 + 0x200], %g1
-	ldx	[%sp + 2047 + 0x208], %g2
-	ldx	[%sp + 2047 + 0x210], %g3
-	ldx	[%sp + 2047 + 0x218], %g4
-	ldx	[%sp + 2047 + 0x220], %g5
-	ldx	[%sp + 2047 + 0x228], %g6
-	ldx	[%sp + 2047 + 0x230], %g7
-	wrpr	%g0, 0x414, %pstate	! save PROM mmu globals
-	stx	%g1, [%sp + 2047 + 0x158]
-	stx	%g2, [%sp + 2047 + 0x160]
-	stx	%g3, [%sp + 2047 + 0x168]
-	stx	%g4, [%sp + 2047 + 0x170]
-	stx	%g5, [%sp + 2047 + 0x178]
-	stx	%g6, [%sp + 2047 + 0x180]
-	stx	%g7, [%sp + 2047 + 0x188]
-					! restore Linux mmu globals
-	ldx	[%sp + 2047 + 0x238], %o0
-	ldx	[%sp + 2047 + 0x240], %o1
-	ldx	[%sp + 2047 + 0x248], %l2
-	ldx	[%sp + 2047 + 0x250], %l3
-	ldx	[%sp + 2047 + 0x258], %l5
-	ldx	[%sp + 2047 + 0x260], %l6
-	ldx	[%sp + 2047 + 0x268], %l7
-					! switch to Linux tba
-	sethi	%hi(sparc64_ttable_tl0), %l1
-	rdpr	%tba, %l0		! save PROM tba
-	mov	%o0, %g1
-	mov	%o1, %g2
-	mov	%l2, %g3
-	mov	%l3, %g4
-	mov	%l5, %g5
-	mov	%l6, %g6
-	mov	%l7, %g7
-	wrpr	%l1, %tba		! install Linux tba
-	wrpr	%l4, 0, %pstate		! restore PSTATE
+	save	%sp, -192, %sp
+	TRAP_LOAD_THREAD_REG(%g6, %g1)
+	LOAD_PER_CPU_BASE(%g5, %g6, %g4, %g3, %o0)
+	ldx	[%g6 + TI_TASK], %g4
 	call	prom_world
-	 mov	%g0, %o0
+	 mov	0, %o0
 	ldx	[%i1 + 0x000], %l2
 	call	%l2
 	 mov	%i0, %o0
 	mov	%o0, %l1
 	call	prom_world
-	 or	%g0, 1, %o0
-	wrpr	%g0, 0x14, %pstate	! interrupts off
-					! restore PROM mmu globals
-	ldx	[%sp + 2047 + 0x158], %o0
-	ldx	[%sp + 2047 + 0x160], %o1
-	ldx	[%sp + 2047 + 0x168], %l2
-	ldx	[%sp + 2047 + 0x170], %l3
-	ldx	[%sp + 2047 + 0x178], %l5
-	ldx	[%sp + 2047 + 0x180], %l6
-	ldx	[%sp + 2047 + 0x188], %l7
-	wrpr	%g0, 0x414, %pstate	! restore PROM mmu globals
-	mov	%o0, %g1
-	mov	%o1, %g2
-	mov	%l2, %g3
-	mov	%l3, %g4
-	mov	%l5, %g5
-	mov	%l6, %g6
-	mov	%l7, %g7
-	wrpr	%l0, %tba		! restore PROM tba
-	wrpr	%g0, 0x14, %pstate	! restore PROM normal globals
-	ldx	[%sp + 2047 + 0x120], %g1
-	ldx	[%sp + 2047 + 0x128], %g2
-	ldx	[%sp + 2047 + 0x130], %g3
-	ldx	[%sp + 2047 + 0x138], %g4
-	ldx	[%sp + 2047 + 0x140], %g5
-	ldx	[%sp + 2047 + 0x148], %g6
-	ldx	[%sp + 2047 + 0x150], %g7
-	wrpr	%g0, 0x814, %pstate	! restore PROM interrupt globals
-	ldx	[%sp + 2047 + 0x0e8], %g1
-	ldx	[%sp + 2047 + 0x0f0], %g2
-	ldx	[%sp + 2047 + 0x0f8], %g3
-	ldx	[%sp + 2047 + 0x100], %g4
-	ldx	[%sp + 2047 + 0x108], %g5
-	ldx	[%sp + 2047 + 0x110], %g6
-	ldx	[%sp + 2047 + 0x118], %g7
-	wrpr	%g0, 0x15, %pstate	! restore PROM alternate globals
-	ldx	[%sp + 2047 + 0x0b0], %g1
-	ldx	[%sp + 2047 + 0x0b8], %g2
-	ldx	[%sp + 2047 + 0x0c0], %g3
-	ldx	[%sp + 2047 + 0x0c8], %g4
-	ldx	[%sp + 2047 + 0x0d0], %g5
-	ldx	[%sp + 2047 + 0x0d8], %g6
-	ldx	[%sp + 2047 + 0x0e0], %g7
-	wrpr	%l4, 0, %pstate
+	 mov	1, %o0
 	ret
 	 restore %l1, 0, %o0