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Diffstat (limited to 'libddekit/pgtab-old.c')
| -rw-r--r-- | libddekit/pgtab-old.c | 219 |
1 files changed, 0 insertions, 219 deletions
diff --git a/libddekit/pgtab-old.c b/libddekit/pgtab-old.c deleted file mode 100644 index 2b13698a..00000000 --- a/libddekit/pgtab-old.c +++ /dev/null @@ -1,219 +0,0 @@ -/* - * \brief Virtual page-table facility - * \author Thomas Friebel <tf13@os.inf.tu-dresden.de> - * \author Christian Helmuth <ch12@os.inf.tu-dresden.de> - * \date 2006-11-01 - * - * Implementation of page tables for saving virt->phys assignments. - * - * FIXME: This works for 32-bit architectures only! (Mostly because of pgtab.h.) - */ - -#include <l4/dde/ddekit/pgtab.h> - -#include <l4/sys/l4int.h> -#include <l4/sys/consts.h> -#include <l4/util/macros.h> -#include <l4/dm_mem/dm_mem.h> -#include <l4/log/l4log.h> - - -/********************************** - ** Page-table utility functions ** - **********************************/ - -/* some useful consts */ -enum -{ - PDIR_SHIFT = L4_SUPERPAGESHIFT, /* readable alias */ - PDIR_MASK = L4_SUPERPAGEMASK, /* readable alias */ - PDIR_ENTRIES = (1 << (L4_MWORD_BITS - PDIR_SHIFT)), - PTAB_ENTRIES = (1 << (PDIR_SHIFT - L4_PAGESHIFT)), - PTAB_SIZE = (sizeof(void*) * PTAB_ENTRIES) -}; - -/** - * Page table entry. - * bit 00-01: type, 0->largemalloc 1->slab page 2->contigmalloc (PTE_TYPE_*) - * bit 02-11: size in number of pages - * bit 12-31: physical page address - */ -typedef union -{ - unsigned compact; - struct - { - unsigned type : 2; - unsigned pages : 10; - unsigned phys : 20; - } components; -} ddekit_pte; - -/** - * Calculate offset of address in page directory - page-table number - */ -static inline unsigned pt_num(l4_addr_t addr) { - return addr >> PDIR_SHIFT; } - - -/** - * Calculate offset of address in page table - page number - */ -static inline unsigned pg_num(l4_addr_t addr) { - return (addr & ~PDIR_MASK) >> L4_PAGESHIFT; } - - -/* page directory */ -static ddekit_pte *page_dir[PDIR_ENTRIES]; - - -/** - * Get page-table entry - */ -static inline ddekit_pte ddekit_get_pte(void *p) -{ - l4_addr_t addr = (l4_mword_t)p; - ddekit_pte *tab; - - tab = page_dir[pt_num(addr)]; - if (!tab) return (ddekit_pte) 0U; - - return tab[pg_num(addr)]; -} - - -/** - * Set page-table entry - */ -static inline void ddekit_set_pte(void *p, ddekit_pte pte) -{ - l4_addr_t addr = (l4_addr_t) p; - ddekit_pte *tab; - - tab = page_dir[pt_num(addr)]; - if (!tab) { - /* create new page table */ - tab = (ddekit_pte *) - l4dm_mem_allocate_named(PTAB_SIZE, L4DM_CONTIGUOUS|L4DM_PINNED|L4RM_MAP, - "ddekit ptab"); - Assert(tab); - - memset(tab, 0, PTAB_SIZE); - page_dir[pt_num(addr)] = tab; - - if (1) { - l4_addr_t a = l4_trunc_superpage(addr); - LOG("created page table for range [0x%08lx,0x%08lx) @ %p\n", - a, a + L4_SUPERPAGESIZE, tab); - } - - } - - tab[pg_num(addr)] = pte; -} - - -/***************************** - ** Page-table facility API ** - *****************************/ - -/** - * Set virtual->physical mapping for VM region - * - * \param virtual virtual start address for region - * \param physical physical start address for region - * \param pages number of pages in region - * \param type pte type for region - */ -void ddekit_pte_set_region(void *virtual, ddekit_addr_t physical, int pages, int type) -{ - ddekit_pte new; - -#ifdef INVARIANTS - ddekit_pte pte; - /* assert pte not set yet */ - pte = ddekit_get_pte(virtual); - LOGd(pte.compact, "first pte already set! pte=0x%04x", pte.compact); -#endif - - /* build pte */ - new.components.type = type; - new.components.pages = pages; - new.components.phys = physical >> L4_PAGESHIFT; - - /* set first pte */ - ddekit_set_pte(virtual, new); - - /* continuation pte-s don't have pages set */ - new.components.pages = 0; - - /* set continuation pte-s */ - for (pages--; pages; pages--) { - /* prepare continuation pte */ - virtual += L4_PAGESIZE; - new.components.phys++; - -#ifdef INVARIANTS - /* assert pte not set yet */ - pte = ddekit_get_pte(virtual); - LOGd(pte.compact, "continuation pte already set! pte=0x%04x", pte.compact); -#endif - - /* set continuation pte */ - ddekit_set_pte(virtual, new); - } -} - - -/** - * Clear virtual->physical mapping for VM region - * - * \param virtual virtual start address for region - * \param type pte type for region - * - * XXX unused page-tables not free'd - */ -void ddekit_pte_clear_region(void *virtual, int type) -{ - ddekit_pte pte; - int pages = 0; - pte = ddekit_get_pte(virtual); - /* get number of pages from pte */ - pages = pte.components.pages; - /* assert pages != 0 */ - if (pages==0) { - LOG("continuation pte found at base"); - return; - } - /* assert pte set and of correct type */ -#ifdef INVARIANTS - LOGd(! pte.compact, "pte is already clear"); - LOGd(pte.components.type!=type, "pte of wrong type"); -#endif - /* clear first pte */ - ddekit_set_pte(virtual, (ddekit_pte) 0U); - /* clear continuation pte-s */ - for (pages--; pages; pages--) { - virtual += L4_PAGESIZE; - -#ifdef INVARIANTS - /* assert pte set and of correct type */ - pte = ddekit_get_pte(virtual); - if (! pte.compact) { - LOG("pte is already clear"); - break; - } - if (pte.components.type!=type) { - LOG("pte of wrong type"); - break; - } - if (pte.components.pages) { - LOG("unexpected non-continuation pte found"); - break; - } -#endif - - ddekit_set_pte(virtual, (ddekit_pte) 0U); - } -} - |