[POWERPC] Remove arch/powerpc's dependence on asm-ppc/pg{alloc,table}.h

Currently, all 32-bit powerpc platforms use asm-ppc/pgtable.h and
asm-ppc/pgalloc.h, even when otherwise compiled with ARCH=powerpc.
Those asm-ppc files are a fairly nasty tangle of #ifdefs including a
bunch of things which shouldn't be necessary any more in arch/powerpc.

Cleaning up that mess is going to take a while, but this patch is a
first step.  It separates the asm-powerpc/pg{alloc,table}.h into 64
bit and 32 bit versions in asm-powerpc, which the basic .h files in
asm-powerpc select based on config.  We make a few tiny tweaks to the
innards of the files along the way, making the outermost ifdefs
(double-inclusion protection and __KERNEL__) a little cleaner, and
#including asm-generic/pgtable.h from the top-level
asm-powerpc/pgtable.h (since both the old 32-bit and 64-bit versions
ended with such an #include).

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/include/asm-powerpc/pgalloc-32.h b/include/asm-powerpc/pgalloc-32.h
new file mode 100644
index 000000000000..235aef283edf
--- /dev/null
+++ b/include/asm-powerpc/pgalloc-32.h
@@ -0,0 +1,41 @@
+#ifndef _ASM_POWERPC_PGALLOC_32_H
+#define _ASM_POWERPC_PGALLOC_32_H
+
+#include <linux/threads.h>
+
+extern void __bad_pte(pmd_t *pmd);
+
+extern pgd_t *pgd_alloc(struct mm_struct *mm);
+extern void pgd_free(pgd_t *pgd);
+
+/*
+ * We don't have any real pmd's, and this code never triggers because
+ * the pgd will always be present..
+ */
+#define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); })
+#define pmd_free(x)                     do { } while (0)
+#define __pmd_free_tlb(tlb,x)           do { } while (0)
+#define pgd_populate(mm, pmd, pte)      BUG()
+
+#ifndef CONFIG_BOOKE
+#define pmd_populate_kernel(mm, pmd, pte)       \
+                (pmd_val(*(pmd)) = __pa(pte) | _PMD_PRESENT)
+#define pmd_populate(mm, pmd, pte)      \
+                (pmd_val(*(pmd)) = (page_to_pfn(pte) << PAGE_SHIFT) | _PMD_PRESENT)
+#else
+#define pmd_populate_kernel(mm, pmd, pte)       \
+                (pmd_val(*(pmd)) = (unsigned long)pte | _PMD_PRESENT)
+#define pmd_populate(mm, pmd, pte)      \
+                (pmd_val(*(pmd)) = (unsigned long)lowmem_page_address(pte) | _PMD_PRESENT)
+#endif
+
+extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr);
+extern struct page *pte_alloc_one(struct mm_struct *mm, unsigned long addr);
+extern void pte_free_kernel(pte_t *pte);
+extern void pte_free(struct page *pte);
+
+#define __pte_free_tlb(tlb, pte)        pte_free((pte))
+
+#define check_pgt_cache()       do { } while (0)
+
+#endif /* _ASM_POWERPC_PGALLOC_32_H */