[PARISC] Further work for multiple page sizes

More work towards supporing multiple page sizes on 64-bit. Convert
some assumptions that 64bit uses 3 level page tables into testing
PT_NLEVELS. Also some BUG() to BUG_ON() conversions and some cleanups
to assembler.

Signed-off-by: Helge Deller <deller@parisc-linux.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

1 files changed, 8 insertions, 7 deletions

diff --git a/arch/parisc/kernel/head.S b/arch/parisc/kernel/head.S
index 0b47afc20690..3e79e62f7b0b 100644
--- a/arch/parisc/kernel/head.S
+++ b/arch/parisc/kernel/head.S
@@ -76,16 +76,16 @@ $bss_loop:
         mtctl           %r4,%cr24       /* Initialize kernel root pointer */
         mtctl           %r4,%cr25       /* Initialize user root pointer */
 
-#ifdef CONFIG_64BIT
+#if PT_NLEVELS == 3
         /* Set pmd in pgd */
         load32          PA(pmd0),%r5
         shrd            %r5,PxD_VALUE_SHIFT,%r3 
-        ldo             (PxD_FLAG_PRESENT+PxD_FLAG_VALID)(%r3),%r3      
+        ldo             (PxD_FLAG_PRESENT+PxD_FLAG_VALID)(%r3),%r3
         stw             %r3,ASM_PGD_ENTRY*ASM_PGD_ENTRY_SIZE(%r4)
         ldo             ASM_PMD_ENTRY*ASM_PMD_ENTRY_SIZE(%r5),%r4
 #else
         /* 2-level page table, so pmd == pgd */
-        ldo             ASM_PGD_ENTRY*ASM_PGD_ENTRY_SIZE(%r4),%r4
+        ldo             ASM_PGD_ENTRY*ASM_PGD_ENTRY_SIZE(%r4),%r4
 #endif
 
         /* Fill in pmd with enough pte directories */
@@ -99,7 +99,7 @@ $bss_loop:
         stw             %r3,0(%r4)
         ldo             (ASM_PAGE_SIZE >> PxD_VALUE_SHIFT)(%r3),%r3
         addib,>         -1,%r1,1b
-#ifdef CONFIG_64BIT
+#if PT_NLEVELS == 3
         ldo             ASM_PMD_ENTRY_SIZE(%r4),%r4
 #else
         ldo             ASM_PGD_ENTRY_SIZE(%r4),%r4
@@ -107,13 +107,14 @@ $bss_loop:
 
 
         /* Now initialize the PTEs themselves */
-        ldo             _PAGE_KERNEL(%r0),%r3 /* Hardwired 0 phys addr start */
+        ldo             0+_PAGE_KERNEL(%r0),%r3 /* Hardwired 0 phys addr start */
+        ldi             (1<<(KERNEL_INITIAL_ORDER-PAGE_SHIFT)),%r11 /* PFN count */
         load32          PA(pg0),%r1
 
 $pgt_fill_loop:
         STREGM          %r3,ASM_PTE_ENTRY_SIZE(%r1)
-        ldo             ASM_PAGE_SIZE(%r3),%r3
-        bb,>=           %r3,31-KERNEL_INITIAL_ORDER,$pgt_fill_loop
+        ldo             (1<<PFN_PTE_SHIFT)(%r3),%r3 /* add one PFN */
+        addib,>         -1,%r11,$pgt_fill_loop
         nop
 
         /* Load the return address...er...crash 'n burn */