[POWERPC] iSeries: Clean up lparmap mess

We need to have xLparMap in head_64.S so that it is at a fixed address
(because the linker will not resolve (address & 0xffffffff) for us).
But the assembler miscalculates the KERNEL_VSID() expressions.  So put
the confusing expressions into asm-offsets.c.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/kernel/Makefile

@@ -80,13 +80,6 @@ ifneq ($(CONFIG_PPC_INDIRECT_IO),y)
 obj-y				+= iomap.o
 endif
 
-ifeq ($(CONFIG_PPC_ISERIES),y)
-CFLAGS_lparmap.s		+= -g0
-extra-y += lparmap.s
-$(obj)/head_64.o:	$(obj)/lparmap.s
-AFLAGS_head_64.o += -I$(obj)
-endif
-
 else
 # stuff used from here for ARCH=ppc
 smpobj-$(CONFIG_SMP)		+= smp.o

arch/powerpc/kernel/asm-offsets.c

@@ -312,5 +312,13 @@ int main(void)
 #ifdef CONFIG_BUG
 	DEFINE(BUG_ENTRY_SIZE, sizeof(struct bug_entry));
 #endif
+
+#ifdef CONFIG_PPC_ISERIES
+	/* the assembler miscalculates the VSID values */
+	DEFINE(PAGE_OFFSET_ESID, GET_ESID(PAGE_OFFSET));
+	DEFINE(PAGE_OFFSET_VSID, KERNEL_VSID(PAGE_OFFSET));
+	DEFINE(VMALLOC_START_ESID, GET_ESID(VMALLOC_START));
+	DEFINE(VMALLOC_START_VSID, KERNEL_VSID(VMALLOC_START));
+#endif
 	return 0;
 }

arch/powerpc/kernel/head_64.S

@@ -34,6 +34,7 @@
 #include <asm/iseries/lpar_map.h>
 #include <asm/thread_info.h>
 #include <asm/firmware.h>
+#include <asm/page_64.h>
 
 #define DO_SOFT_DISABLE
 
@@ -1519,8 +1520,8 @@ _GLOBAL(do_stab_bolted)
  * Space for CPU0's segment table.
  *
  * On iSeries, the hypervisor must fill in at least one entry before
- * we get control (with relocate on).  The address is give to the hv
- * as a page number (see xLparMap in lpardata.c), so this must be at a
+ * we get control (with relocate on).  The address is given to the hv
+ * as a page number (see xLparMap below), so this must be at a
  * fixed address (the linker can't compute (u64)&initial_stab >>
  * PAGE_SHIFT).
  */
@@ -1542,12 +1543,22 @@ fwnmi_data_area:
 	 * both pSeries and iSeries */
 #ifdef CONFIG_PPC_ISERIES
         . = LPARMAP_PHYS
-#include "lparmap.s"
-/*
- * This ".text" is here for old compilers that generate a trailing
- * .note section when compiling .c files to .s
- */
-	.text
+	.globl xLparMap
+xLparMap:
+	.quad	HvEsidsToMap		/* xNumberEsids */
+	.quad	HvRangesToMap		/* xNumberRanges */
+	.quad	STAB0_PAGE		/* xSegmentTableOffs */
+	.zero	40			/* xRsvd */
+	/* xEsids (HvEsidsToMap entries of 2 quads) */
+	.quad	PAGE_OFFSET_ESID	/* xKernelEsid */
+	.quad	PAGE_OFFSET_VSID	/* xKernelVsid */
+	.quad	VMALLOC_START_ESID	/* xKernelEsid */
+	.quad	VMALLOC_START_VSID	/* xKernelVsid */
+	/* xRanges (HvRangesToMap entries of 3 quads) */
+	.quad	HvPagesToMap		/* xPages */
+	.quad	0			/* xOffset */
+	.quad	PAGE_OFFSET_VSID << (SID_SHIFT - HW_PAGE_SHIFT)	/* xVPN */
+
 #endif /* CONFIG_PPC_ISERIES */
 
         . = 0x8000

include/asm-powerpc/iseries/lpar_map.h

@@ -22,6 +22,8 @@
 
 #include <asm/types.h>
 
+#endif
+
 /*
  * The iSeries hypervisor will set up mapping for one or more
  * ESID/VSID pairs (in SLB/segment registers) and will set up
@@ -56,6 +58,7 @@
 /* Hypervisor initially maps 32MB of the load area */
 #define HvPagesToMap	8192
 
+#ifndef __ASSEMBLY__
 struct LparMap {
 	u64	xNumberEsids;	// Number of ESID/VSID pairs
 	u64	xNumberRanges;	// Number of VA ranges to map

include/asm-powerpc/page_64.h

@@ -28,7 +28,7 @@
 
 /* Segment size */
 #define SID_SHIFT		28
-#define SID_MASK		0xfffffffffUL
+#define SID_MASK		ASM_CONST(0xfffffffff)
 #define ESID_MASK		0xfffffffff0000000UL
 #define GET_ESID(x)		(((x) >> SID_SHIFT) & SID_MASK)