patch-2.3.17 linux/arch/m68k/mm/init.c

• Lines: 366
• Date: Sat Sep 4 13:06:41 1999
• Orig file: v2.3.16/linux/arch/m68k/mm/init.c
• Orig date: Tue Aug 31 17:29:12 1999

diff -u --recursive --new-file v2.3.16/linux/arch/m68k/mm/init.c linux/arch/m68k/mm/init.c
@@ -2,6 +2,9 @@
  *  linux/arch/m68k/mm/init.c
  *
  *  Copyright (C) 1995  Hamish Macdonald
+ *
+ *  Contains common initialization routines, specific init code moved
+ *  to motorola.c and sun3mmu.c
  */
 
 #include <linux/config.h>
@@ -28,7 +31,10 @@
 #include <asm/atari_stram.h>
 #endif
 
-extern void die_if_kernel(char *,struct pt_regs *,long);
+#ifdef CONFIG_SUN3
+void mmu_emu_reserve_pages(unsigned long max_page);
+#endif
+
 extern void show_net_buffers(void);
 
 int do_check_pgt_cache(int low, int high)
@@ -58,7 +64,7 @@
  * ZERO_PAGE is a special page that is used for zero-initialized
  * data and COW.
  */
-static unsigned long empty_bad_page_table;
+unsigned long empty_bad_page_table;
 
 pte_t *__bad_pagetable(void)
 {
@@ -66,7 +72,7 @@
     return (pte_t *)empty_bad_page_table;
 }
 
-static unsigned long empty_bad_page;
+unsigned long empty_bad_page;
 
 pte_t __bad_page(void)
 {
@@ -111,169 +117,6 @@
 #endif
 }
 
-#ifndef mm_cachebits
-/*
- * Bits to add to page descriptors for "normal" caching mode.
- * For 68020/030 this is 0.
- * For 68040, this is _PAGE_CACHE040 (cachable, copyback)
- */
-unsigned long mm_cachebits = 0;
-#endif
-
-static pte_t * __init kernel_page_table(unsigned long *memavailp)
-{
-	pte_t *ptablep;
-
-	ptablep = (pte_t *)*memavailp;
-	*memavailp += PAGE_SIZE;
-
-	clear_page((unsigned long)ptablep);
-	flush_page_to_ram((unsigned long) ptablep);
-	flush_tlb_kernel_page((unsigned long) ptablep);
-	nocache_page ((unsigned long)ptablep);
-
-	return ptablep;
-}
-
-static pmd_t *last_pgtable __initdata = NULL;
-static pmd_t *zero_pgtable __initdata = NULL;
-
-static pmd_t * __init kernel_ptr_table(unsigned long *memavailp)
-{
-	if (!last_pgtable) {
-		unsigned long pmd, last;
-		int i;
-
-		/* Find the last ptr table that was used in head.S and
-		 * reuse the remaining space in that page for further
-		 * ptr tables.
-		 */
-		last = (unsigned long)kernel_pg_dir;
-		for (i = 0; i < PTRS_PER_PGD; i++) {
-			if (!pgd_present(kernel_pg_dir[i]))
-				continue;
-			pmd = pgd_page(kernel_pg_dir[i]);
-			if (pmd > last)
-				last = pmd;
-		}
-
-		last_pgtable = (pmd_t *)last;
-#ifdef DEBUG
-		printk("kernel_ptr_init: %p\n", last_pgtable);
-#endif
-	}
-
-	if (((unsigned long)(last_pgtable + PTRS_PER_PMD) & ~PAGE_MASK) == 0) {
-		last_pgtable = (pmd_t *)*memavailp;
-		*memavailp += PAGE_SIZE;
-
-		clear_page((unsigned long)last_pgtable);
-		flush_page_to_ram((unsigned long)last_pgtable);
-		flush_tlb_kernel_page((unsigned long)last_pgtable);
-		nocache_page((unsigned long)last_pgtable);
-	} else
-		last_pgtable += PTRS_PER_PMD;
-
-	return last_pgtable;
-}
-
-static unsigned long __init
-map_chunk (unsigned long addr, long size, unsigned long *memavailp)
-{
-#define PTRTREESIZE (256*1024)
-#define ROOTTREESIZE (32*1024*1024)
-	static unsigned long virtaddr = PAGE_OFFSET;
-	unsigned long physaddr;
-	pgd_t *pgd_dir;
-	pmd_t *pmd_dir;
-	pte_t *pte_dir;
-
-	physaddr = (addr | m68k_supervisor_cachemode |
-		    _PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_DIRTY);
-	if (CPU_IS_040_OR_060)
-		physaddr |= _PAGE_GLOBAL040;
-
-	while (size > 0) {
-#ifdef DEBUG
-		if (!(virtaddr & (PTRTREESIZE-1)))
-			printk ("\npa=%#lx va=%#lx ", physaddr & PAGE_MASK,
-				virtaddr);
-#endif
-		pgd_dir = pgd_offset_k(virtaddr);
-		if (virtaddr && CPU_IS_020_OR_030) {
-			if (!(virtaddr & (ROOTTREESIZE-1)) &&
-			    size >= ROOTTREESIZE) {
-#ifdef DEBUG
-				printk ("[very early term]");
-#endif
-				pgd_val(*pgd_dir) = physaddr;
-				size -= ROOTTREESIZE;
-				virtaddr += ROOTTREESIZE;
-				physaddr += ROOTTREESIZE;
-				continue;
-			}
-		}
-		if (!pgd_present(*pgd_dir)) {
-			pmd_dir = kernel_ptr_table(memavailp);
-#ifdef DEBUG
-			printk ("[new pointer %p]", pmd_dir);
-#endif
-			pgd_set(pgd_dir, pmd_dir);
-		} else
-			pmd_dir = pmd_offset(pgd_dir, virtaddr);
-
-		if (CPU_IS_020_OR_030) {
-			if (virtaddr) {
-#ifdef DEBUG
-				printk ("[early term]");
-#endif
-				pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr;
-				physaddr += PTRTREESIZE;
-			} else {
-				int i;
-#ifdef DEBUG
-				printk ("[zero map]");
-#endif
-				zero_pgtable = kernel_ptr_table(memavailp);
-				pte_dir = (pte_t *)zero_pgtable;
-				pmd_dir->pmd[0] = virt_to_phys(pte_dir) |
-					_PAGE_TABLE | _PAGE_ACCESSED;
-				pte_val(*pte_dir++) = 0;
-				physaddr += PAGE_SIZE;
-				for (i = 1; i < 64; physaddr += PAGE_SIZE, i++)
-					pte_val(*pte_dir++) = physaddr;
-			}
-			size -= PTRTREESIZE;
-			virtaddr += PTRTREESIZE;
-		} else {
-			if (!pmd_present(*pmd_dir)) {
-#ifdef DEBUG
-				printk ("[new table]");
-#endif
-				pte_dir = kernel_page_table(memavailp);
-				pmd_set(pmd_dir, pte_dir);
-			}
-			pte_dir = pte_offset(pmd_dir, virtaddr);
-
-			if (virtaddr) {
-				if (!pte_present(*pte_dir))
-					pte_val(*pte_dir) = physaddr;
-			} else
-				pte_val(*pte_dir) = 0;
-			size -= PAGE_SIZE;
-			virtaddr += PAGE_SIZE;
-			physaddr += PAGE_SIZE;
-		}
-
-	}
-#ifdef DEBUG
-	printk("\n");
-#endif
-
-	return virtaddr;
-}
-
-extern unsigned long free_area_init(unsigned long, unsigned long);
 extern void init_pointer_table(unsigned long ptable);
 
 /* References to section boundaries */
@@ -281,87 +124,7 @@
 extern char _text, _etext, _edata, __bss_start, _end;
 extern char __init_begin, __init_end;
 
-/*
- * paging_init() continues the virtual memory environment setup which
- * was begun by the code in arch/head.S.
- */
-unsigned long __init paging_init(unsigned long start_mem,
-				     unsigned long end_mem)
-{
-	int chunk;
-	unsigned long mem_avail = 0;
-
-#ifdef DEBUG
-	{
-		extern unsigned long availmem;
-		printk ("start of paging_init (%p, %lx, %lx, %lx)\n",
-			kernel_pg_dir, availmem, start_mem, end_mem);
-	}
-#endif
-
-	/* Fix the cache mode in the page descriptors for the 680[46]0.  */
-	if (CPU_IS_040_OR_060) {
-		int i;
-#ifndef mm_cachebits
-		mm_cachebits = _PAGE_CACHE040;
-#endif
-		for (i = 0; i < 16; i++)
-			pgprot_val(protection_map[i]) |= _PAGE_CACHE040;
-	}
-	/* Fix the PAGE_NONE value. */
-	if (CPU_IS_040_OR_060) {
-		/* On the 680[46]0 we can use the _PAGE_SUPER bit.  */
-		pgprot_val(protection_map[0]) |= _PAGE_SUPER;
-		pgprot_val(protection_map[VM_SHARED]) |= _PAGE_SUPER;
-	} else {
-		/* Otherwise we must fake it. */
-		pgprot_val(protection_map[0]) &= ~_PAGE_PRESENT;
-		pgprot_val(protection_map[0]) |= _PAGE_FAKE_SUPER;
-		pgprot_val(protection_map[VM_SHARED]) &= ~_PAGE_PRESENT;
-		pgprot_val(protection_map[VM_SHARED]) |= _PAGE_FAKE_SUPER;
-	}
-
-	/*
-	 * Map the physical memory available into the kernel virtual
-	 * address space.  It may allocate some memory for page
-	 * tables and thus modify availmem.
-	 */
-
-	for (chunk = 0; chunk < m68k_num_memory; chunk++) {
-		mem_avail = map_chunk (m68k_memory[chunk].addr,
-				       m68k_memory[chunk].size, &start_mem);
-
-	}
-
-	flush_tlb_all();
-#ifdef DEBUG
-	printk ("memory available is %ldKB\n", mem_avail >> 10);
-	printk ("start_mem is %#lx\nvirtual_end is %#lx\n",
-		start_mem, end_mem);
-#endif
-
-	/*
-	 * initialize the bad page table and bad page to point
-	 * to a couple of allocated pages
-	 */
-	empty_bad_page_table = start_mem;
-	start_mem += PAGE_SIZE;
-	empty_bad_page = start_mem;
-	start_mem += PAGE_SIZE;
-	empty_zero_page = start_mem;
-	start_mem += PAGE_SIZE;
-	memset((void *)empty_zero_page, 0, PAGE_SIZE);
-
-	/*
-	 * Set up SFC/DFC registers (user data space)
-	 */
-	set_fs (USER_DS);
-
-#ifdef DEBUG
-	printk ("before free_area_init\n");
-#endif
-	return PAGE_ALIGN(free_area_init(start_mem, end_mem));
-}
+extern pmd_t *zero_pgtable;
 
 void __init mem_init(unsigned long start_mem, unsigned long end_mem)
 {
@@ -386,18 +149,22 @@
 		atari_stram_reserve_pages( start_mem );
 #endif
 
+#ifdef CONFIG_SUN3
+	/* reserve rom pages */
+	mmu_emu_reserve_pages(max_mapnr);
+#endif
+
 	for (tmp = PAGE_OFFSET ; tmp < end_mem ; tmp += PAGE_SIZE) {
+#ifndef CONFIG_SUN3
 		if (virt_to_phys ((void *)tmp) >= mach_max_dma_address)
 			clear_bit(PG_DMA, &mem_map[MAP_NR(tmp)].flags);
+#endif
 		if (PageReserved(mem_map+MAP_NR(tmp))) {
 			if (tmp >= (unsigned long)&_text
-			    && tmp < (unsigned long)&_edata) {
-				if (tmp < (unsigned long) &_etext)
-					codepages++;
-				else
-					datapages++;
-			} else if (tmp >= (unsigned long) &__init_begin
-				   && tmp < (unsigned long) &__init_end)
+			    && tmp < (unsigned long)&_etext)
+				codepages++;
+			else if (tmp >= (unsigned long) &__init_begin
+				 && tmp < (unsigned long) &__init_end)
 				initpages++;
 			else
 				datapages++;
@@ -410,7 +177,8 @@
 #endif
 			free_page(tmp);
 	}
-
+	
+#ifndef CONFIG_SUN3
 	/* insert pointer tables allocated so far into the tablelist */
 	init_pointer_table((unsigned long)kernel_pg_dir);
 	for (i = 0; i < PTRS_PER_PGD; i++) {
@@ -421,6 +189,7 @@
 	/* insert also pointer table that we used to unmap the zero page */
 	if (zero_pgtable)
 		init_pointer_table((unsigned long)zero_pgtable);
+#endif
 
 	printk("Memory: %luk/%luk available (%dk kernel code, %dk data, %dk init)\n",
 	       (unsigned long) nr_free_pages << (PAGE_SHIFT-10),
@@ -428,18 +197,6 @@
 	       codepages << (PAGE_SHIFT-10),
 	       datapages << (PAGE_SHIFT-10),
 	       initpages << (PAGE_SHIFT-10));
-}
-
-void free_initmem(void)
-{
-	unsigned long addr;
-
-	addr = (unsigned long)&__init_begin;
-	for (; addr < (unsigned long)&__init_end; addr += PAGE_SIZE) {
-		mem_map[MAP_NR(addr)].flags &= ~(1 << PG_reserved);
-		set_page_count(mem_map+MAP_NR(addr), 1);
-		free_page(addr);
-	}
 }
 
 void si_meminfo(struct sysinfo *val)