patch-2.3.29 linux/include/asm-arm/pgalloc.h

• Lines: 206
• Date: Tue Nov 23 22:23:11 1999
• Orig file: v2.3.28/linux/include/asm-arm/pgalloc.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.28/linux/include/asm-arm/pgalloc.h linux/include/asm-arm/pgalloc.h
@@ -0,0 +1,205 @@
+/*
+ * linux/include/asm-arm/pgalloc.h
+ */
+#ifndef _ASMARM_PGALLOC_H
+#define _ASMARM_PGALLOC_H
+
+#include <linux/config.h>
+#include <linux/threads.h>
+
+#include <asm/processor.h>
+
+/*
+ * Get the cache handling stuff now.
+ */
+#include <asm/proc/cache.h>
+
+/*
+ * Page table cache stuff
+ */
+#ifndef CONFIG_NO_PGT_CACHE
+
+#ifdef __SMP__
+#error Pgtable caches have to be per-CPU, so that no locking is needed.
+#endif	/* __SMP__ */
+
+extern struct pgtable_cache_struct {
+	unsigned long *pgd_cache;
+	unsigned long *pte_cache;
+	unsigned long pgtable_cache_sz;
+} quicklists;
+
+#define pgd_quicklist		(quicklists.pgd_cache)
+#define pmd_quicklist		((unsigned long *)0)
+#define pte_quicklist		(quicklists.pte_cache)
+#define pgtable_cache_size	(quicklists.pgtable_cache_sz)
+
+/* used for quicklists */
+#define __pgd_next(pgd) (((unsigned long *)pgd)[1])
+#define __pte_next(pte)	(((unsigned long *)pte)[0])
+
+extern __inline__ pgd_t *get_pgd_fast(void)
+{
+	unsigned long *ret;
+
+	if ((ret = pgd_quicklist) != NULL) {
+		pgd_quicklist = (unsigned long *)__pgd_next(ret);
+		ret[1] = ret[2];
+		clean_cache_area(ret + 1, 4);
+		pgtable_cache_size--;
+	}
+	return (pgd_t *)ret;
+}
+
+extern __inline__ void free_pgd_fast(pgd_t *pgd)
+{
+	__pgd_next(pgd) = (unsigned long) pgd_quicklist;
+	pgd_quicklist = (unsigned long *) pgd;
+	pgtable_cache_size++;
+}
+
+/* We don't use pmd cache, so this is a dummy routine */
+#define get_pmd_fast()		((pmd_t *)0)
+
+extern __inline__ void free_pmd_fast(pmd_t *pmd)
+{
+}
+
+extern __inline__ pte_t *get_pte_fast(void)
+{
+	unsigned long *ret;
+
+	if((ret = pte_quicklist) != NULL) {
+		pte_quicklist = (unsigned long *)__pte_next(ret);
+		ret[0] = ret[1];
+		clean_cache_area(ret, 4);
+		pgtable_cache_size--;
+	}
+	return (pte_t *)ret;
+}
+
+extern __inline__ void free_pte_fast(pte_t *pte)
+{
+	__pte_next(pte) = (unsigned long) pte_quicklist;
+	pte_quicklist = (unsigned long *) pte;
+	pgtable_cache_size++;
+}
+
+#else	/* CONFIG_NO_PGT_CACHE */
+
+#define pgd_quicklist		((unsigned long *)0)
+#define pmd_quicklist		((unsigned long *)0)
+#define pte_quicklist		((unsigned long *)0)
+
+#define get_pgd_fast()		((pgd_t *)0)
+#define get_pmd_fast()		((pmd_t *)0)
+#define get_pte_fast()		((pte_t *)0)
+
+#define free_pgd_fast(pgd)	free_pgd_slow(pgd)
+#define free_pmd_fast(pmd)	free_pmd_slow(pmd)
+#define free_pte_fast(pte)	free_pte_slow(pte)
+
+#endif	/* CONFIG_NO_PGT_CACHE */
+
+extern pgd_t *get_pgd_slow(void);
+extern void free_pgd_slow(pgd_t *pgd);
+
+#define free_pmd_slow(pmd)	do { } while (0)
+
+extern pte_t *get_pte_kernel_slow(pmd_t *pmd, unsigned long addr_preadjusted);
+extern pte_t *get_pte_slow(pmd_t *pmd, unsigned long addr_preadjusted);
+extern void free_pte_slow(pte_t *pte);
+
+/*
+ * Allocate and free page tables. The xxx_kernel() versions are
+ * used to allocate a kernel page table - this turns on ASN bits
+ * if any.
+ */
+#define pte_free_kernel(pte)	free_pte_fast(pte)
+#define pte_free(pte)		free_pte_fast(pte)
+
+#ifndef pte_alloc_kernel
+extern __inline__ pte_t * pte_alloc_kernel(pmd_t *pmd, unsigned long address)
+{
+	address = (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1);
+	if (pmd_none(*pmd)) {
+		pte_t *page = (pte_t *) get_pte_fast();
+
+		if (!page)
+			return get_pte_kernel_slow(pmd, address);
+		set_pmd(pmd, mk_kernel_pmd(page));
+		return page + address;
+	}
+	if (pmd_bad(*pmd)) {
+		__handle_bad_pmd_kernel(pmd);
+		return NULL;
+	}
+	return (pte_t *) pmd_page(*pmd) + address;
+}
+#endif
+
+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 = (pte_t *) get_pte_fast();
+
+		if (!page)
+			return get_pte_slow(pmd, address);
+		set_pmd(pmd, mk_user_pmd(page));
+		return page + address;
+	}
+	if (pmd_bad(*pmd)) {
+		__handle_bad_pmd(pmd);
+		return NULL;
+	}
+	return (pte_t *) pmd_page(*pmd) + address;
+}
+
+#define pmd_free_kernel		pmd_free
+#define pmd_free(pmd)		do { } while (0)
+
+#define pmd_alloc_kernel	pmd_alloc
+extern __inline__ pmd_t *pmd_alloc(pgd_t *pgd, unsigned long address)
+{
+	return (pmd_t *) pgd;
+}
+
+#define pgd_free(pgd)		free_pgd_fast(pgd)
+
+extern __inline__ pgd_t *pgd_alloc(void)
+{
+	pgd_t *pgd;
+
+	pgd = get_pgd_fast();
+	if (!pgd)
+		pgd = get_pgd_slow();
+
+	return pgd;
+}
+
+extern int do_check_pgt_cache(int, int);
+
+extern __inline__ void set_pgdir(unsigned long address, pgd_t entry)
+{
+	struct task_struct * p;
+
+	read_lock(&tasklist_lock);
+	for_each_task(p) {
+		if (!p->mm)
+			continue;
+		*pgd_offset(p->mm,address) = entry;
+	}
+	read_unlock(&tasklist_lock);
+
+#ifndef CONFIG_NO_PGT_CACHE
+	{
+		pgd_t *pgd;
+		for (pgd = (pgd_t *)pgd_quicklist; pgd;
+		     pgd = (pgd_t *)__pgd_next(pgd))
+			pgd[address >> PGDIR_SHIFT] = entry;
+	}
+#endif
+}
+
+#endif