patch-2.1.80 linux/include/asm-arm/proc-armo/mm-init.h

• Lines: 131
• Date: Tue Jan 20 16:39:42 1998
• Orig file: v2.1.79/linux/include/asm-arm/proc-armo/mm-init.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.79/linux/include/asm-arm/proc-armo/mm-init.h linux/include/asm-arm/proc-armo/mm-init.h
@@ -0,0 +1,130 @@
+/*
+ * linux/include/asm-arm/proc-armo/mm-init.h
+ *
+ * Copyright (C) 1996 Russell King
+ *
+ * This contains the code to setup the memory map on an ARM2/ARM250/ARM3
+ * machine. This is both processor & architecture specific, and requires
+ * some more work to get it to fit into our separate processor and
+ * architecture structure.
+ */
+
+static unsigned long phys_screen_end;
+int page_nr;
+
+#define setup_processor_functions()
+#define PTE_SIZE	(PTRS_PER_PTE * BYTES_PER_PTR)
+
+static inline void setup_swapper_dir (int index, pte_t *ptep)
+{
+	set_pmd (pmd_offset (swapper_pg_dir + index, 0), mk_pmd (ptep));
+}
+
+/*
+ * This routine needs more work to make it dynamically release/allocate mem!
+ */
+unsigned long map_screen_mem(unsigned long log_start, unsigned long kmem, int update)
+{
+	static int updated = 0;
+
+	if (updated)
+		return 0;
+
+	updated = update;
+
+	if (update) {
+		unsigned long address = log_start, offset;
+		pgd_t *pgdp;
+
+		kmem = (kmem + 3) & ~3;
+
+		pgdp = pgd_offset (&init_mm, address);				/* +31 */
+		offset = SCREEN_START;
+		while (address < SCREEN1_END) {
+			unsigned long addr_pmd, end_pmd;
+			pmd_t *pmdp;
+
+			/* if (pgd_none (*pgdp)) alloc pmd */
+			pmdp = pmd_offset (pgdp, address);			/* +0 */
+			addr_pmd = address & ~PGDIR_MASK;			/* 088000 */
+			end_pmd = addr_pmd + SCREEN1_END - address;		/* 100000 */
+			if (end_pmd > PGDIR_SIZE)
+				end_pmd = PGDIR_SIZE;
+
+			do {
+				unsigned long addr_pte, end_pte;
+				pte_t *ptep;
+
+				if (pmd_none (*pmdp)) {
+					pte_t *new_pte = (pte_t *)kmem;
+					kmem += PTRS_PER_PTE * BYTES_PER_PTR;
+					memzero (new_pte, PTRS_PER_PTE * BYTES_PER_PTR);
+					set_pmd (pmdp, mk_pmd(new_pte));
+				}
+
+				ptep = pte_offset (pmdp, addr_pmd);		/* +11 */
+				addr_pte = addr_pmd & ~PMD_MASK;		/* 088000 */
+				end_pte = addr_pte + end_pmd - addr_pmd;	/* 100000 */
+				if (end_pte > PMD_SIZE)
+					end_pte = PMD_SIZE;
+
+				do {
+					set_pte (ptep, mk_pte(offset, PAGE_KERNEL));
+					addr_pte += PAGE_SIZE;
+					offset += PAGE_SIZE;
+					ptep++;
+				} while (addr_pte < end_pte);
+
+				pmdp++;
+				addr_pmd = (addr_pmd + PMD_SIZE) & PMD_MASK;
+			} while (addr_pmd < end_pmd);
+
+			address = (address + PGDIR_SIZE) & PGDIR_MASK;
+			pgdp ++;
+		}
+
+		phys_screen_end = offset;
+		flush_tlb_all ();
+		update_mm_cache_all ();
+	}
+	return kmem;
+}
+
+static inline unsigned long setup_pagetables(unsigned long start_mem, unsigned long end_mem)
+{
+	unsigned int i;
+	union {unsigned long l; pte_t *pte; } u;
+
+	page_nr = MAP_NR(end_mem);
+
+	/* map in pages for (0x0000 - 0x8000) */
+	u.l = ((start_mem + (PTE_SIZE-1)) & ~(PTE_SIZE-1));
+	start_mem = u.l + PTE_SIZE;
+	memzero (u.pte, PTE_SIZE);
+	u.pte[0] = mk_pte(PAGE_OFFSET + 491520, PAGE_READONLY);
+	setup_swapper_dir (0, u.pte);
+
+	for (i = 1; i < PTRS_PER_PGD; i++)
+		pgd_val(swapper_pg_dir[i]) = 0;
+
+	/* now map screen mem in */
+	phys_screen_end = SCREEN2_END;
+	map_screen_mem (SCREEN1_END - 480*1024, 0, 0);
+
+	return start_mem;
+}
+
+static inline void mark_usable_memory_areas(unsigned long *start_mem, unsigned long end_mem)
+{
+	unsigned long smem;
+
+	*start_mem = smem = PAGE_ALIGN(*start_mem);
+
+	while (smem < end_mem) {
+		clear_bit(PG_reserved, &mem_map[MAP_NR(smem)].flags);
+		smem += PAGE_SIZE;
+	}
+
+	for (smem = phys_screen_end; smem < SCREEN2_END; smem += PAGE_SIZE)
+		clear_bit(PG_reserved, &mem_map[MAP_NR(smem)].flags);
+}