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/* sun3_pgalloc.h --
* reorganization around 2.3.39, routines moved from sun3_pgtable.h
*
* moved 1/26/2000 Sam Creasey
*/
#ifndef _SUN3_PGALLOC_H
#define _SUN3_PGALLOC_H
/* Pagetable caches. */
//todo: should implement for at least ptes. --m
#define pgd_quicklist ((unsigned long *) 0)
#define pmd_quicklist ((unsigned long *) 0)
#define pte_quicklist ((unsigned long *) 0)
#define pgtable_cache_size (0L)
/* Allocation and deallocation of various flavours of pagetables. */
extern inline int free_pmd_fast (pmd_t *pmdp) { return 0; }
extern inline int free_pmd_slow (pmd_t *pmdp) { return 0; }
extern inline pmd_t *get_pmd_fast (void) { return (pmd_t *) 0; }
//todo: implement the following properly.
#define get_pte_fast() ((pte_t *) 0)
#define get_pte_slow pte_alloc
#define free_pte_fast(pte)
#define free_pte_slow pte_free
/* FIXME - when we get this compiling */
/* erm, now that it's compiling, what do we do with it? */
#define _KERNPG_TABLE 0
extern inline void pte_free_kernel(pte_t * pte)
{
free_page((unsigned long) pte);
}
extern const char bad_pmd_string[];
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_free_page(GFP_KERNEL);
if (pmd_none(*pmd)) {
if (page) {
pmd_val(*pmd) = _KERNPG_TABLE + __pa(page);
return page + address;
}
pmd_val(*pmd) = _KERNPG_TABLE + __pa((unsigned long)BAD_PAGETABLE);
return NULL;
}
free_page((unsigned long) page);
}
if (pmd_bad(*pmd)) {
printk(bad_pmd_string, pmd_val(*pmd));
printk("at kernel pgd off %08x\n", (unsigned int)pmd);
pmd_val(*pmd) = _KERNPG_TABLE + __pa((unsigned long)BAD_PAGETABLE);
return NULL;
}
return (pte_t *) __pmd_page(*pmd) + address;
}
/*
* allocating and freeing a pmd is trivial: the 1-entry pmd is
* inside the pgd, so has no extra memory associated with it.
*/
extern inline void pmd_free_kernel(pmd_t * pmd)
{
// pmd_val(*pmd) = 0;
}
extern inline pmd_t * pmd_alloc_kernel(pgd_t * pgd, unsigned long address)
{
return (pmd_t *) pgd;
}
extern inline void pte_free(pte_t * pte)
{
free_page((unsigned long) pte);
}
extern inline pte_t * pte_alloc(pmd_t * pmd, unsigned long address)
{
address = (address >> (PAGE_SHIFT-2)) & 4*(PTRS_PER_PTE - 1);
repeat:
if (pmd_none(*pmd))
goto getnew;
if (pmd_bad(*pmd))
goto fix;
return (pte_t *) (__pmd_page(*pmd) + address);
getnew:
{
unsigned long page = __get_free_page(GFP_KERNEL);
if (!pmd_none(*pmd))
goto freenew;
if (!page)
goto oom;
memset((void *)page, 0, PAGE_SIZE);
// pmd_val(*pmd) = SUN3_PMD_MAGIC + __pa(page);
pmd_val(*pmd) = __pa(page);
return (pte_t *) (page + address);
freenew:
free_page(page);
goto repeat;
}
fix:
printk(bad_pmd_string, pmd_val(*pmd));
printk("in normal pgd offset %08x\n", (unsigned int)pmd);
oom:
// pmd_val(*pmd) = SUN3_PMD_MAGIC + __pa(BAD_PAGETABLE);
pmd_val(*pmd) = __pa(BAD_PAGETABLE);
return NULL;
}
/*
* allocating and freeing a pmd is trivial: the 1-entry pmd is
* inside the pgd, so has no extra memory associated with it.
*/
extern inline void pmd_free(pmd_t * pmd)
{
pmd_val(*pmd) = 0;
}
extern inline pmd_t * pmd_alloc(pgd_t * pgd, unsigned long address)
{
return (pmd_t *) pgd;
}
extern inline void pgd_free(pgd_t * pgd)
{
free_page((unsigned long) pgd);
}
extern inline pgd_t * pgd_alloc(void)
{
pgd_t *new_pgd;
new_pgd = (pgd_t *)get_free_page(GFP_KERNEL);
memcpy(new_pgd, swapper_pg_dir, PAGE_SIZE);
memset(new_pgd, 0, (PAGE_OFFSET >> PGDIR_SHIFT));
return new_pgd;
}
/* FIXME: the sun3 doesn't have a page table cache!
(but the motorola routine should just return 0) */
extern int do_check_pgt_cache(int, int);
extern inline void set_pgdir(unsigned long address, pgd_t entry)
{
}
/* Reserved PMEGs. */
extern char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
extern unsigned long pmeg_vaddr[SUN3_PMEGS_NUM];
extern unsigned char pmeg_alloc[SUN3_PMEGS_NUM];
extern unsigned char pmeg_ctx[SUN3_PMEGS_NUM];
/* Flush all userspace mappings one by one... (why no flush command,
sun?) */
static inline void flush_tlb_all(void)
{
unsigned long addr;
unsigned char ctx, oldctx;
oldctx = sun3_get_context();
for(addr = 0x00000000; addr < TASK_SIZE; addr += SUN3_PMEG_SIZE) {
for(ctx = 0; ctx < 8; ctx++) {
sun3_put_context(ctx);
sun3_put_segmap(addr, SUN3_INVALID_PMEG);
}
}
sun3_put_context(oldctx);
/* erase all of the userspace pmeg maps, we've clobbered them
all anyway */
for(addr = 0; addr < SUN3_INVALID_PMEG; addr++) {
if(pmeg_alloc[addr] == 1) {
pmeg_alloc[addr] = 0;
pmeg_ctx[addr] = 0;
pmeg_vaddr[addr] = 0;
}
}
}
/* Clear user TLB entries within the context named in mm */
static inline void flush_tlb_mm (struct mm_struct *mm)
{
unsigned char oldctx;
unsigned char seg;
unsigned long i;
oldctx = sun3_get_context();
sun3_put_context(mm->context);
for(i = 0; i < TASK_SIZE; i += SUN3_PMEG_SIZE) {
seg = sun3_get_segmap(i);
if(seg == SUN3_INVALID_PMEG)
continue;
sun3_put_segmap(i, SUN3_INVALID_PMEG);
pmeg_alloc[seg] = 0;
pmeg_ctx[seg] = 0;
pmeg_vaddr[seg] = 0;
}
sun3_put_context(oldctx);
}
/* Flush a single TLB page. In this case, we're limited to flushing a
single PMEG */
static inline void flush_tlb_page (struct vm_area_struct *vma,
unsigned long addr)
{
unsigned char oldctx;
unsigned char i;
oldctx = sun3_get_context();
sun3_put_context(vma->vm_mm->context);
addr &= ~SUN3_PMEG_MASK;
if((i = sun3_get_segmap(addr)) != SUN3_INVALID_PMEG)
{
pmeg_alloc[i] = 0;
pmeg_ctx[i] = 0;
pmeg_vaddr[i] = 0;
sun3_put_segmap (addr, SUN3_INVALID_PMEG);
}
sun3_put_context(oldctx);
}
/* Flush a range of pages from TLB. */
static inline void flush_tlb_range (struct mm_struct *mm,
unsigned long start, unsigned long end)
{
unsigned char seg, oldctx;
start &= ~SUN3_PMEG_MASK;
oldctx = sun3_get_context();
sun3_put_context(mm->context);
while(start < end)
{
if((seg = sun3_get_segmap(start)) == SUN3_INVALID_PMEG)
goto next;
if(pmeg_ctx[seg] == mm->context) {
pmeg_alloc[seg] = 0;
pmeg_ctx[seg] = 0;
pmeg_vaddr[seg] = 0;
}
sun3_put_segmap(start, SUN3_INVALID_PMEG);
next:
start += SUN3_PMEG_SIZE;
}
}
/* Flush kernel page from TLB. */
static inline void flush_tlb_kernel_page (unsigned long addr)
{
sun3_put_segmap (addr & ~(SUN3_PMEG_SIZE - 1), SUN3_INVALID_PMEG);
}
extern inline void flush_tlb_pgtables(struct mm_struct *mm,
unsigned long start, unsigned long end)
{
}
#endif /* SUN3_PGALLOC_H */
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