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

• Lines: 83
• Date: Tue Jan 20 16:39:42 1998
• Orig file: v2.1.79/linux/include/asm-arm/proc-armo/mm-init-flat.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-flat.h linux/include/asm-arm/proc-armo/mm-init-flat.h
@@ -0,0 +1,82 @@
+/*
+ * linux/include/asm-arm/proc-armo/mmap.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()
+
+/*
+ * 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;
+	unsigned long address = SCREEN_START, i;
+	pgd_t *pg_dir;
+	pmd_t *pm_dir;
+	pte_t *pt_entry;
+
+	if (updated)
+		return 0;
+	updated = update;
+
+	pg_dir = swapper_pg_dir + (SCREEN1_BASE >> PGDIR_SHIFT);
+	pm_dir = pmd_offset(pg_dir, SCREEN1_BASE);
+	pt_entry = pte_offset(pm_dir, SCREEN1_BASE);
+
+	for (i = SCREEN1_BASE; i < SCREEN1_END; i += PAGE_SIZE) {
+		if (i >= log_start) {
+			*pt_entry = mk_pte(address, __pgprot(_PAGE_PRESENT));
+			address += PAGE_SIZE;
+		} else
+			*pt_entry = mk_pte(0, __pgprot(0));
+		pt_entry++;
+	}
+	phys_screen_end = address;
+	if (update)
+		flush_tlb_all ();
+	return kmem;
+}
+
+static inline unsigned long setup_pagetables(unsigned long start_mem, unsigned long end_mem)
+{
+	unsigned long address;
+	unsigned int spi;
+
+	page_nr = MAP_NR(end_mem);
+
+	/* Allocate zero page */
+	address = PAGE_OFFSET + 480*1024;
+	for (spi = 0; spi < 32768 >> PAGE_SHIFT; spi++) {
+		pgd_val(swapper_pg_dir[spi]) = pte_val(mk_pte(address, PAGE_READONLY));
+		address += PAGE_SIZE;
+	}
+
+	while (spi < (PAGE_OFFSET >> PGDIR_SHIFT))
+		pgd_val(swapper_pg_dir[spi++]) = 0;
+
+	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 = 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);
+}