1 files changed, 72 insertions, 0 deletions
diff --git a/arch/sparc64/prom/map.S b/arch/sparc64/prom/map.S
new file mode 100644
index 000000000000..21b3f9c99ea7
--- /dev/null
+++ b/arch/sparc64/prom/map.S
@@ -0,0 +1,72 @@
+/* $Id: map.S,v 1.2 1999/11/19 05:53:02 davem Exp $
+ * map.S: Tricky coding required to fixup the kernel OBP maps
+ *	  properly.
+ *
+ * Copyright (C) 1999 David S. Miller (davem@redhat.com)
+ */
+
+	.text
+	.align	8192
+	.globl	prom_boot_page
+prom_boot_page:
+call_method:
+	.asciz	"call-method"
+	.align	8
+map:
+	.asciz	"map"
+	.align	8
+
+	/* When we are invoked, our caller has remapped us to
+	 * page zero, therefore we must use PC relative addressing
+	 * for everything after we begin performing the unmap/map
+	 * calls.
+	 */
+	.globl	prom_remap
+prom_remap:	/* %o0 = physpage, %o1 = virtpage, %o2 = mmu_ihandle */
+	rd	%pc, %g1
+	srl	%o2, 0, %o2			! kill sign extension
+	sethi	%hi(p1275buf), %g2
+	or	%g2, %lo(p1275buf), %g2
+	ldx	[%g2 + 0x10], %g3		! prom_cif_stack
+	save	%g3, -(192 + 128), %sp
+	ldx	[%g2 + 0x08], %l0		! prom_cif_handler
+	mov	%g6, %i3
+	mov	%g4, %i4
+	mov	%g5, %i5
+	flushw
+
+	sethi	%hi(prom_remap - call_method), %g7
+	or	%g7, %lo(prom_remap - call_method), %g7
+	sub	%g1, %g7, %l2			! call-method string
+	sethi	%hi(prom_remap - map), %g7
+	or	%g7, %lo(prom_remap - map), %g7
+	sub	%g1, %g7, %l4			! map string
+
+	/* OK, map the 4MB region we really live at. */
+	stx	%l2, [%sp + 2047 + 128 + 0x00]	! call-method
+	mov	7, %l5
+	stx	%l5, [%sp + 2047 + 128 + 0x08]	! num_args
+	mov	1, %l5
+	stx	%l5, [%sp + 2047 + 128 + 0x10]	! num_rets
+	stx	%l4, [%sp + 2047 + 128 + 0x18]	! map
+	stx	%i2, [%sp + 2047 + 128 + 0x20]	! mmu_ihandle
+	mov	-1, %l5
+	stx	%l5, [%sp + 2047 + 128 + 0x28]	! mode == default
+	sethi	%hi(4 * 1024 * 1024), %l5
+	stx	%l5, [%sp + 2047 + 128 + 0x30]	! size
+	stx	%i1, [%sp + 2047 + 128 + 0x38]	! vaddr
+	stx	%g0, [%sp + 2047 + 128 + 0x40]	! filler
+	stx	%i0, [%sp + 2047 + 128 + 0x48]	! paddr
+	call	%l0
+	 add	%sp, (2047 + 128), %o0		! argument array
+
+	/* Restore hard-coded globals. */
+	mov	%i3, %g6
+	mov	%i4, %g4
+	mov	%i5, %g5
+
+	/* Wheee.... we are done. */
+	ret
+	restore
+
+	.align	8192