/* 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; } #define pmd_alloc_one_fast(mm, address) ({ BUG(); ((pmd_t *)1); }) #define pmd_alloc_one(mm,address) ({ BUG(); ((pmd_t *)2); }) extern inline void pte_free(pte_t * pte) { free_page((unsigned long) pte); } static inline pte_t *pte_alloc_one(struct mm_struct *mm, unsigned long address) { unsigned long page = __get_free_page(GFP_KERNEL); if (!page) return NULL; memset((void *)page, 0, PAGE_SIZE); // pmd_val(*pmd) = SUN3_PMD_MAGIC + __pa(page); /* pmd_val(*pmd) = __pa(page); */ return (pte_t *) (page); } #define pte_alloc_one_fast(mm,addr) pte_alloc_one(mm,addr) #define pmd_populate(mm, pmd, pte) (pmd_val(*pmd) = __pa((unsigned long)pte)) /* * 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 void pgd_free(pgd_t * pgd) { free_page((unsigned long) pgd); } extern inline pgd_t * pgd_alloc(struct mm_struct *mm) { 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; } #define pgd_populate(mm, pmd, pte) BUG() /* 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 */