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

• Lines: 119
• Date: Tue Jan 20 16:39:43 1998
• Orig file: v2.1.79/linux/include/asm-arm/proc-armv/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-armv/mm-init.h linux/include/asm-arm/proc-armv/mm-init.h
@@ -0,0 +1,118 @@
+/*
+ * linux/include/asm-arm/proc-armv/mm-init.h
+ *
+ * Copyright (C) 1996 Russell King
+ *
+ * This contains the code to setup the memory map on an ARM v3 or v4 machine.
+ * This is both processor & architecture specific, and requires some
+ * more work to get it to fit into our separate processor and architecture
+ * structure.
+ */
+
+/*
+ * On ebsa, we want the memory map set up so:
+ *
+ *   PHYS	  VIRT
+ * 00000000	00000000	Zero page
+ * 000003ff	000003ff	Zero page end
+ * 00000000	c0000000	Kernel and all physical memory
+ * 01ffffff	c1ffffff	End of physical (32MB)
+ * e0000000	e0000000	IO start
+ * ffffffff	ffffffff	IO end
+ *
+ * On rpc, we want:
+ *
+ *   PHYS	  VIRT
+ * 10000000	00000000	Zero page
+ * 100003ff	000003ff	Zero page end
+ * 10000000	c0000000	Kernel and all physical memory
+ * 1fffffff	cfffffff	End of physical (32MB)
+ * 02000000	d?000000	Screen memory (first image)
+ * 02000000	d8000000	Screen memory (second image)
+ * 00000000	df000000	StrongARM cache invalidation area
+ * 03000000	e0000000	IO start
+ * 03ffffff	e0ffffff	IO end
+ *
+ * We set it up using the section page table entries.
+ */
+
+#include <asm/arch/mmap.h>
+#include <asm/pgtable.h>
+ 
+#define V2P(x)	virt_to_phys(x)
+#define PTE_SIZE (PTRS_PER_PTE * 4)
+
+#define PMD_SECT	(PMD_TYPE_SECT | PMD_DOMAIN(DOMAIN_KERNEL) | PMD_SECT_CACHEABLE)
+
+static inline void setup_swapper_dir (int index, unsigned long entry)
+{
+	pmd_t pmd;
+
+	pmd_val(pmd) = entry;
+	set_pmd (pmd_offset (swapper_pg_dir + index, 0), pmd);
+}
+
+static inline unsigned long setup_pagetables(unsigned long start_mem, unsigned long end_mem)
+{
+	unsigned long address;
+	unsigned int spi;
+	union { unsigned long l; unsigned long *p; } u;
+
+	/* map in zero page */
+	u.l = ((start_mem + (PTE_SIZE-1)) & ~(PTE_SIZE-1));
+	start_mem = u.l + PTE_SIZE;
+	memzero (u.p, PTE_SIZE);
+	*u.p = V2P(PAGE_OFFSET) | PTE_CACHEABLE | PTE_TYPE_SMALL;
+	setup_swapper_dir (0, V2P(u.l) | PMD_TYPE_TABLE | PMD_DOMAIN(DOMAIN_USER));
+
+	for (spi = 1; spi < (PAGE_OFFSET >> PGDIR_SHIFT); spi++)
+		pgd_val(swapper_pg_dir[spi]) = 0;
+
+	/* map in physical ram & kernel */
+	address = PAGE_OFFSET;
+	while (spi < end_mem >> PGDIR_SHIFT) {
+		setup_swapper_dir (spi++,
+				V2P(address) | PMD_SECT |
+				PMD_SECT_BUFFERABLE | PMD_SECT_AP_WRITE);
+		address += PGDIR_SIZE;
+	}
+	while (spi < PTRS_PER_PGD)
+		pgd_val(swapper_pg_dir[spi++]) = 0;
+
+	/*
+	 * An area to invalidate the cache
+	 */
+	setup_swapper_dir (0xdf0, SAFE_ADDR | PMD_SECT | PMD_SECT_AP_READ);
+
+	/* map in IO */
+	address = IO_START;
+	spi = IO_BASE >> PGDIR_SHIFT;
+	pgd_val(swapper_pg_dir[spi-1]) = 0xc0000000 | PMD_TYPE_SECT |
+					 PMD_DOMAIN(DOMAIN_KERNEL) | PMD_SECT_AP_WRITE;
+	while (address < IO_START + IO_SIZE && address) {
+		pgd_val(swapper_pg_dir[spi++]) = address |
+						PMD_TYPE_SECT | PMD_DOMAIN(DOMAIN_IO) |
+						PMD_SECT_AP_WRITE;
+		address += PGDIR_SIZE;
+	}
+
+#ifdef HAVE_MAP_VID_MEM
+	map_screen_mem(0, 0, 0);
+#endif
+
+	flush_cache_all();
+	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;
+	}
+}	
+