patch-2.4.0-test12 linux/include/asm-m68k/motorola_pgalloc.h

• Lines: 261
• Date: Mon Nov 27 18:00:49 2000
• Orig file: v2.4.0-test11/linux/include/asm-m68k/motorola_pgalloc.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test11/linux/include/asm-m68k/motorola_pgalloc.h linux/include/asm-m68k/motorola_pgalloc.h
@@ -0,0 +1,260 @@
+#ifndef _MOTOROLA_PGALLOC_H
+#define _MOTOROLA_PGALLOC_H
+
+extern struct pgtable_cache_struct {
+	unsigned long *pmd_cache;
+	unsigned long *pte_cache;
+/* This counts in units of pointer tables, of which can be eight per page. */
+	unsigned long pgtable_cache_sz;
+} quicklists;
+
+#define pgd_quicklist ((unsigned long *)0)
+#define pmd_quicklist (quicklists.pmd_cache)
+#define pte_quicklist (quicklists.pte_cache)
+/* This isn't accurate because of fragmentation of allocated pages for
+   pointer tables, but that should not be a problem. */
+#define pgtable_cache_size ((quicklists.pgtable_cache_sz+7)/8)
+
+extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long offset);
+extern pmd_t *get_pmd_slow(pgd_t *pgd, unsigned long offset);
+
+extern pmd_t *get_pointer_table(void);
+extern int free_pointer_table(pmd_t *);
+
+extern inline pte_t *get_pte_fast(void)
+{
+	unsigned long *ret;
+
+	ret = pte_quicklist;
+	if (ret) {
+		pte_quicklist = (unsigned long *)*ret;
+		ret[0] = 0;
+		quicklists.pgtable_cache_sz -= 8;
+	}
+	return (pte_t *)ret;
+}
+
+extern inline void free_pte_fast(pte_t *pte)
+{
+	*(unsigned long *)pte = (unsigned long)pte_quicklist;
+	pte_quicklist = (unsigned long *)pte;
+	quicklists.pgtable_cache_sz += 8;
+}
+
+extern inline void free_pte_slow(pte_t *pte)
+{
+	cache_page((unsigned long)pte);
+	free_page((unsigned long) pte);
+}
+
+extern inline pmd_t *get_pmd_fast(void)
+{
+	unsigned long *ret;
+
+	ret = pmd_quicklist;
+	if (ret) {
+		pmd_quicklist = (unsigned long *)*ret;
+		ret[0] = 0;
+		quicklists.pgtable_cache_sz--;
+	}
+	return (pmd_t *)ret;
+}
+
+extern inline void free_pmd_fast(pmd_t *pmd)
+{
+	*(unsigned long *)pmd = (unsigned long)pmd_quicklist;
+	pmd_quicklist = (unsigned long *) pmd;
+	quicklists.pgtable_cache_sz++;
+}
+
+extern inline int free_pmd_slow(pmd_t *pmd)
+{
+	return free_pointer_table(pmd);
+}
+
+/* The pgd cache is folded into the pmd cache, so these are dummy routines. */
+extern inline pgd_t *get_pgd_fast(void)
+{
+	return (pgd_t *)0;
+}
+
+extern inline void free_pgd_fast(pgd_t *pgd)
+{
+}
+
+extern inline void free_pgd_slow(pgd_t *pgd)
+{
+}
+
+extern void __bad_pte(pmd_t *pmd);
+extern void __bad_pmd(pgd_t *pgd);
+
+extern inline void pte_free(pte_t *pte)
+{
+	free_pte_fast(pte);
+}
+
+extern inline pte_t *pte_alloc(pmd_t *pmd, unsigned long address)
+{
+	address = (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
+	if (pmd_none(*pmd)) {
+		pte_t *page = get_pte_fast();
+
+		if (!page)
+			return get_pte_slow(pmd, address);
+		pmd_set(pmd,page);
+		return page + address;
+	}
+	if (pmd_bad(*pmd)) {
+		__bad_pte(pmd);
+		return NULL;
+	}
+	return (pte_t *)__pmd_page(*pmd) + address;
+}
+
+extern inline void pmd_free(pmd_t *pmd)
+{
+	free_pmd_fast(pmd);
+}
+
+extern inline pmd_t *pmd_alloc(pgd_t *pgd, unsigned long address)
+{
+	address = (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
+	if (pgd_none(*pgd)) {
+		pmd_t *page = get_pmd_fast();
+
+		if (!page)
+			return get_pmd_slow(pgd, address);
+		pgd_set(pgd, page);
+		return page + address;
+	}
+	if (pgd_bad(*pgd)) {
+		__bad_pmd(pgd);
+		return NULL;
+	}
+	return (pmd_t *)__pgd_page(*pgd) + address;
+}
+
+extern inline void pte_free_kernel(pte_t *pte)
+{
+	free_pte_fast(pte);
+}
+
+extern inline pte_t *pte_alloc_kernel(pmd_t *pmd, unsigned long address)
+{
+	return pte_alloc(pmd, address);
+}
+
+extern inline void pmd_free_kernel(pmd_t *pmd)
+{
+	free_pmd_fast(pmd);
+}
+
+extern inline pmd_t *pmd_alloc_kernel(pgd_t *pgd, unsigned long address)
+{
+	return pmd_alloc(pgd, address);
+}
+
+extern inline void pgd_free(pgd_t *pgd)
+{
+	free_pmd_fast((pmd_t *)pgd);
+}
+
+extern inline pgd_t *pgd_alloc(void)
+{
+	pgd_t *pgd = (pgd_t *)get_pmd_fast();
+	if (!pgd)
+		pgd = (pgd_t *)get_pointer_table();
+	return pgd;
+}
+
+extern int do_check_pgt_cache(int, int);
+
+extern inline void set_pgdir(unsigned long address, pgd_t entry)
+{
+}
+
+
+/*
+ * flush all user-space atc entries.
+ */
+static inline void __flush_tlb(void)
+{
+	if (CPU_IS_040_OR_060)
+		__asm__ __volatile__(".chip 68040\n\t"
+				     "pflushan\n\t"
+				     ".chip 68k");
+	else
+		__asm__ __volatile__("pflush #0,#4");
+}
+
+static inline void __flush_tlb040_one(unsigned long addr)
+{
+	__asm__ __volatile__(".chip 68040\n\t"
+			     "pflush (%0)\n\t"
+			     ".chip 68k"
+			     : : "a" (addr));
+}
+
+static inline void __flush_tlb_one(unsigned long addr)
+{
+	if (CPU_IS_040_OR_060)
+		__flush_tlb040_one(addr);
+	else
+		__asm__ __volatile__("pflush #0,#4,(%0)" : : "a" (addr));
+}
+
+#define flush_tlb() __flush_tlb()
+
+/*
+ * flush all atc entries (both kernel and user-space entries).
+ */
+static inline void flush_tlb_all(void)
+{
+	if (CPU_IS_040_OR_060)
+		__asm__ __volatile__(".chip 68040\n\t"
+				     "pflusha\n\t"
+				     ".chip 68k");
+	else
+		__asm__ __volatile__("pflusha");
+}
+
+static inline void flush_tlb_mm(struct mm_struct *mm)
+{
+	if (mm == current->mm)
+		__flush_tlb();
+}
+
+static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
+{
+	if (vma->vm_mm == current->mm)
+		__flush_tlb_one(addr);
+}
+
+static inline void flush_tlb_range(struct mm_struct *mm,
+				   unsigned long start, unsigned long end)
+{
+	if (mm == current->mm)
+		__flush_tlb();
+}
+
+extern inline void flush_tlb_kernel_page(unsigned long addr)
+{
+	if (CPU_IS_040_OR_060) {
+		mm_segment_t old_fs = get_fs();
+		set_fs(KERNEL_DS);
+		__asm__ __volatile__(".chip 68040\n\t"
+				     "pflush (%0)\n\t"
+				     ".chip 68k"
+				     : : "a" (addr));
+		set_fs(old_fs);
+	} else
+		__asm__ __volatile__("pflush #4,#4,(%0)" : : "a" (addr));
+}
+
+extern inline void flush_tlb_pgtables(struct mm_struct *mm,
+				      unsigned long start, unsigned long end)
+{
+}
+
+#endif /* _MOTOROLA_PGALLOC_H */