sh: pmd rework.

Remove extra bits from the pmd structure and store a kernel logical
address rather than a physical address. This allows it to be directly
dereferenced. Another piece of wierdness inherited from x86.

Signed-off-by: Stuart Menefy <stuart.menefy@st.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 49 insertions, 17 deletions

diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c
index 43bed2c..128907e 100644
--- a/arch/sh/mm/fault.c
+++ b/arch/sh/mm/fault.c
@@ -46,6 +46,45 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
 	mm = tsk->mm;
 	si_code = SEGV_MAPERR;
 
+	if (unlikely(address >= TASK_SIZE)) {
+		/*
+		 * Synchronize this task's top level page-table
+		 * with the 'reference' page table.
+		 *
+		 * Do _not_ use "tsk" here. We might be inside
+		 * an interrupt in the middle of a task switch..
+		 */
+		int offset = pgd_index(address);
+		pgd_t *pgd, *pgd_k;
+		pud_t *pud, *pud_k;
+		pmd_t *pmd, *pmd_k;
+
+		pgd = get_TTB() + offset;
+		pgd_k = swapper_pg_dir + offset;
+
+		/* This will never happen with the folded page table. */
+		if (!pgd_present(*pgd)) {
+			if (!pgd_present(*pgd_k))
+				goto bad_area_nosemaphore;
+			set_pgd(pgd, *pgd_k);
+			return;
+		}
+
+		pud = pud_offset(pgd, address);
+		pud_k = pud_offset(pgd_k, address);
+		if (pud_present(*pud) || !pud_present(*pud_k))
+			goto bad_area_nosemaphore;
+		set_pud(pud, *pud_k);
+
+		pmd = pmd_offset(pud, address);
+		pmd_k = pmd_offset(pud_k, address);
+		if (pmd_present(*pmd) || !pmd_present(*pmd_k))
+			goto bad_area_nosemaphore;
+		set_pmd(pmd, *pmd_k);
+
+		return;
+	}
+
 	/*
 	 * If we're in an interrupt or have no user
 	 * context, we must not take the fault..
@@ -109,6 +148,7 @@ survive:
 bad_area:
 	up_read(&mm->mmap_sem);
 
+bad_area_nosemaphore:
 	if (user_mode(regs)) {
 		info.si_signo = SIGSEGV;
 		info.si_errno = 0;
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 8c8d391..462bfea 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -84,30 +84,22 @@ static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
 	pmd_t *pmd;
 	pte_t *pte;
 
-	pgd = swapper_pg_dir + pgd_index(addr);
+	pgd = pgd_offset_k(addr);
 	if (pgd_none(*pgd)) {
 		pgd_ERROR(*pgd);
 		return;
 	}
 
-	pud = pud_offset(pgd, addr);
-	if (pud_none(*pud)) {
-		pmd = (pmd_t *)get_zeroed_page(GFP_ATOMIC);
-		set_pud(pud, __pud(__pa(pmd) | _PAGE_TABLE));
-		if (pmd != pmd_offset(pud, 0)) {
-			pud_ERROR(*pud);
-			return;
-		}
+	pud = pud_alloc(NULL, pgd, addr);
+	if (unlikely(!pud)) {
+		pud_ERROR(*pud);
+		return;
 	}
 
-	pmd = pmd_offset(pud, addr);
-	if (pmd_none(*pmd)) {
-		pte = (pte_t *)get_zeroed_page(GFP_ATOMIC);
-		set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
-		if (pte != pte_offset_kernel(pmd, 0)) {
-			pmd_ERROR(*pmd);
-			return;
-		}
+	pmd = pmd_alloc(NULL, pud, addr);
+	if (unlikely(!pmd)) {
+		pmd_ERROR(*pmd);
+		return;
 	}
 
 	pte = pte_offset_kernel(pmd, addr);