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/* $Id: pgalloc.h,v 1.30 2001/12/21 04:56:17 davem Exp $ */
#ifndef _SPARC64_PGALLOC_H
#define _SPARC64_PGALLOC_H
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <asm/page.h>
#include <asm/spitfire.h>
#include <asm/pgtable.h>
#include <asm/cpudata.h>
/* Page table allocation/freeing. */
#ifdef CONFIG_SMP
/* Sliiiicck */
#define pgt_quicklists cpu_data(smp_processor_id())
#else
extern struct pgtable_cache_struct {
unsigned long *pgd_cache;
unsigned long *pte_cache[2];
unsigned int pgcache_size;
unsigned int pgdcache_size;
} pgt_quicklists;
#endif
#define pgd_quicklist (pgt_quicklists.pgd_cache)
#define pmd_quicklist ((unsigned long *)0)
#define pte_quicklist (pgt_quicklists.pte_cache)
#define pgtable_cache_size (pgt_quicklists.pgcache_size)
#define pgd_cache_size (pgt_quicklists.pgdcache_size)
#ifndef CONFIG_SMP
static __inline__ void free_pgd_fast(pgd_t *pgd)
{
struct page *page = virt_to_page(pgd);
preempt_disable();
if (!page->lru.prev) {
(unsigned long *)page->lru.next = pgd_quicklist;
pgd_quicklist = (unsigned long *)page;
}
(unsigned long)page->lru.prev |=
(((unsigned long)pgd & (PAGE_SIZE / 2)) ? 2 : 1);
pgd_cache_size++;
preempt_enable();
}
static __inline__ pgd_t *get_pgd_fast(void)
{
struct page *ret;
preempt_disable();
if ((ret = (struct page *)pgd_quicklist) != NULL) {
unsigned long mask = (unsigned long)ret->lru.prev;
unsigned long off = 0;
if (mask & 1)
mask &= ~1;
else {
off = PAGE_SIZE / 2;
mask &= ~2;
}
(unsigned long)ret->lru.prev = mask;
if (!mask)
pgd_quicklist = (unsigned long *)ret->lru.next;
ret = (struct page *)(__page_address(ret) + off);
pgd_cache_size--;
preempt_enable();
} else {
struct page *page;
preempt_enable();
page = alloc_page(GFP_KERNEL|__GFP_REPEAT);
if (page) {
ret = (struct page *)page_address(page);
clear_page(ret);
(unsigned long)page->lru.prev = 2;
preempt_disable();
(unsigned long *)page->lru.next = pgd_quicklist;
pgd_quicklist = (unsigned long *)page;
pgd_cache_size++;
preempt_enable();
}
}
return (pgd_t *)ret;
}
#else /* CONFIG_SMP */
static __inline__ void free_pgd_fast(pgd_t *pgd)
{
preempt_disable();
*(unsigned long *)pgd = (unsigned long) pgd_quicklist;
pgd_quicklist = (unsigned long *) pgd;
pgtable_cache_size++;
preempt_enable();
}
static __inline__ pgd_t *get_pgd_fast(void)
{
unsigned long *ret;
preempt_disable();
if((ret = pgd_quicklist) != NULL) {
pgd_quicklist = (unsigned long *)(*ret);
ret[0] = 0;
pgtable_cache_size--;
preempt_enable();
} else {
preempt_enable();
ret = (unsigned long *) __get_free_page(GFP_KERNEL|__GFP_REPEAT);
if(ret)
memset(ret, 0, PAGE_SIZE);
}
return (pgd_t *)ret;
}
static __inline__ void free_pgd_slow(pgd_t *pgd)
{
free_page((unsigned long)pgd);
}
#endif /* CONFIG_SMP */
#if (L1DCACHE_SIZE > PAGE_SIZE) /* is there D$ aliasing problem */
#define VPTE_COLOR(address) (((address) >> (PAGE_SHIFT + 10)) & 1UL)
#define DCACHE_COLOR(address) (((address) >> PAGE_SHIFT) & 1UL)
#else
#define VPTE_COLOR(address) 0
#define DCACHE_COLOR(address) 0
#endif
#define pgd_populate(MM, PGD, PMD) pgd_set(PGD, PMD)
static __inline__ pmd_t *pmd_alloc_one_fast(struct mm_struct *mm, unsigned long address)
{
unsigned long *ret;
int color = 0;
preempt_disable();
if (pte_quicklist[color] == NULL)
color = 1;
if((ret = (unsigned long *)pte_quicklist[color]) != NULL) {
pte_quicklist[color] = (unsigned long *)(*ret);
ret[0] = 0;
pgtable_cache_size--;
}
preempt_enable();
return (pmd_t *)ret;
}
static __inline__ pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
{
pmd_t *pmd;
pmd = pmd_alloc_one_fast(mm, address);
if (!pmd) {
pmd = (pmd_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
if (pmd)
memset(pmd, 0, PAGE_SIZE);
}
return pmd;
}
static __inline__ void free_pmd_fast(pmd_t *pmd)
{
unsigned long color = DCACHE_COLOR((unsigned long)pmd);
preempt_disable();
*(unsigned long *)pmd = (unsigned long) pte_quicklist[color];
pte_quicklist[color] = (unsigned long *) pmd;
pgtable_cache_size++;
preempt_enable();
}
static __inline__ void free_pmd_slow(pmd_t *pmd)
{
free_page((unsigned long)pmd);
}
#define pmd_populate_kernel(MM, PMD, PTE) pmd_set(PMD, PTE)
#define pmd_populate(MM,PMD,PTE_PAGE) \
pmd_populate_kernel(MM,PMD,page_address(PTE_PAGE))
extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address);
#define pte_alloc_one(MM,ADDR) virt_to_page(pte_alloc_one_kernel(MM,ADDR))
static __inline__ pte_t *pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
{
unsigned long color = VPTE_COLOR(address);
unsigned long *ret;
preempt_disable();
if((ret = (unsigned long *)pte_quicklist[color]) != NULL) {
pte_quicklist[color] = (unsigned long *)(*ret);
ret[0] = 0;
pgtable_cache_size--;
}
preempt_enable();
return (pte_t *)ret;
}
static __inline__ void free_pte_fast(pte_t *pte)
{
unsigned long color = DCACHE_COLOR((unsigned long)pte);
preempt_disable();
*(unsigned long *)pte = (unsigned long) pte_quicklist[color];
pte_quicklist[color] = (unsigned long *) pte;
pgtable_cache_size++;
preempt_enable();
}
static __inline__ void free_pte_slow(pte_t *pte)
{
free_page((unsigned long)pte);
}
#define pte_free_kernel(pte) free_pte_fast(pte)
#define pte_free(pte) free_pte_fast(page_address(pte))
#define pmd_free(pmd) free_pmd_fast(pmd)
#define pgd_free(pgd) free_pgd_fast(pgd)
#define pgd_alloc(mm) get_pgd_fast()
#endif /* _SPARC64_PGALLOC_H */
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