[PATCH] powerpc: Separate usage of KERNELBASE and PAGE_OFFSET

This patch separates usage of KERNELBASE and PAGE_OFFSET. I haven't
looked at any of the PPC32 code, if we ever want to support Kdump on
PPC we'll have to do another audit, ditto for iSeries.

This patch makes PAGE_OFFSET the constant, it'll always be 0xC * 1
gazillion for 64-bit.

To get a physical address from a virtual one you subtract PAGE_OFFSET,
_not_ KERNELBASE.

KERNELBASE is the virtual address of the start of the kernel, it's
often the same as PAGE_OFFSET, but _might not be_.

If you want to know something's offset from the start of the kernel
you should subtract KERNELBASE.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

4 files changed, 9 insertions, 10 deletions

diff --git a/arch/powerpc/kernel/btext.c b/arch/powerpc/kernel/btext.c
index 893dd24a9f67..5de0d80ca2f2 100644
--- a/arch/powerpc/kernel/btext.c
+++ b/arch/powerpc/kernel/btext.c
@@ -60,7 +60,7 @@ int force_printk_to_btext = 0;
  *
  * The display is mapped to virtual address 0xD0000000, rather
  * than 1:1, because some some CHRP machines put the frame buffer
- * in the region starting at 0xC0000000 (KERNELBASE).
+ * in the region starting at 0xC0000000 (PAGE_OFFSET).
  * This mapping is temporary and will disappear as soon as the
  * setup done by MMU_Init() is applied.
  *
@@ -71,7 +71,7 @@ int force_printk_to_btext = 0;
  */
 void __init btext_prepare_BAT(void)
 {
-        unsigned long vaddr = KERNELBASE + 0x10000000;
+        unsigned long vaddr = PAGE_OFFSET + 0x10000000;
         unsigned long addr;
         unsigned long lowbits;
 
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index 7b9397169709..aacebb33e98a 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -690,7 +690,7 @@ _GLOBAL(enter_rtas)
 
         /* Setup our real return addr */        
         SET_REG_TO_LABEL(r4,.rtas_return_loc)
-        SET_REG_TO_CONST(r9,KERNELBASE)
+        SET_REG_TO_CONST(r9,PAGE_OFFSET)
         sub     r4,r4,r9
         mtlr    r4
 
@@ -718,7 +718,7 @@ _GLOBAL(enter_rtas)
 _STATIC(rtas_return_loc)
         /* relocation is off at this point */
         mfspr   r4,SPRN_SPRG3           /* Get PACA */
-        SET_REG_TO_CONST(r5, KERNELBASE)
+        SET_REG_TO_CONST(r5, PAGE_OFFSET)
         sub     r4,r4,r5                /* RELOC the PACA base pointer */
 
         mfmsr   r6
diff --git a/arch/powerpc/kernel/lparmap.c b/arch/powerpc/kernel/lparmap.c
index 5a05a797485f..8a53d436ad9a 100644
--- a/arch/powerpc/kernel/lparmap.c
+++ b/arch/powerpc/kernel/lparmap.c
@@ -16,8 +16,8 @@ const struct LparMap __attribute__((__section__(".text"))) xLparMap = {
         .xSegmentTableOffs = STAB0_PAGE,
 
         .xEsids = {
-                { .xKernelEsid = GET_ESID(KERNELBASE),
-                  .xKernelVsid = KERNEL_VSID(KERNELBASE), },
+                { .xKernelEsid = GET_ESID(PAGE_OFFSET),
+                  .xKernelVsid = KERNEL_VSID(PAGE_OFFSET), },
                 { .xKernelEsid = GET_ESID(VMALLOCBASE),
                   .xKernelVsid = KERNEL_VSID(VMALLOCBASE), },
         },
@@ -25,7 +25,7 @@ const struct LparMap __attribute__((__section__(".text"))) xLparMap = {
         .xRanges = {
                 { .xPages = HvPagesToMap,
                   .xOffset = 0,
-                  .xVPN = KERNEL_VSID(KERNELBASE) << (SID_SHIFT - HW_PAGE_SHIFT),
+                  .xVPN = KERNEL_VSID(PAGE_OFFSET) << (SID_SHIFT - HW_PAGE_SHIFT),
                 },
         },
 };
diff --git a/arch/powerpc/kernel/machine_kexec_64.c b/arch/powerpc/kernel/machine_kexec_64.c
index ec0f06bfc24a..0b0fa4768995 100644
--- a/arch/powerpc/kernel/machine_kexec_64.c
+++ b/arch/powerpc/kernel/machine_kexec_64.c
@@ -153,9 +153,8 @@ void kexec_copy_flush(struct kimage *image)
          * including ones that were in place on the original copy
          */
         for (i = 0; i < nr_segments; i++)
-                flush_icache_range(ranges[i].mem + KERNELBASE,
-                                ranges[i].mem + KERNELBASE +
-                                ranges[i].memsz);
+                flush_icache_range((unsigned long)__va(ranges[i].mem),
+                        (unsigned long)__va(ranges[i].mem + ranges[i].memsz));
 }
 
 #ifdef CONFIG_SMP