[linux-2.6-block.git] / arch / m68k / mm / motorola.c

/*
 * linux/arch/m68k/mm/motorola.c
 *
 * Routines specific to the Motorola MMU, originally from:
 * linux/arch/m68k/init.c
 * which are Copyright (C) 1995 Hamish Macdonald
 *
 * Moved 8/20/1999 Sam Creasey
 */

#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/bootmem.h>

#include <asm/setup.h>
#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/system.h>
#include <asm/machdep.h>
#include <asm/io.h>
#include <asm/dma.h>
#ifdef CONFIG_ATARI
#include <asm/atari_stram.h>
#endif

#undef DEBUG

#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;
EXPORT_SYMBOL(mm_cachebits);
#endif

/* size of memory already mapped in head.S */
#define INIT_MAPPED_SIZE	(4UL<<20)

extern unsigned long availmem;

static pte_t * __init kernel_page_table(void)
{
	pte_t *ptablep;

	ptablep = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);

	clear_page(ptablep);
	__flush_page_to_ram(ptablep);
	flush_tlb_kernel_page(ptablep);
	nocache_page(ptablep);

	return ptablep;
}

static pmd_t *last_pgtable __initdata = NULL;
pmd_t *zero_pgtable __initdata = NULL;

static pmd_t * __init kernel_ptr_table(void)
{
	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
	}

	last_pgtable += PTRS_PER_PMD;
	if (((unsigned long)last_pgtable & ~PAGE_MASK) == 0) {
		last_pgtable = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);

		clear_page(last_pgtable);
		__flush_page_to_ram(last_pgtable);
		flush_tlb_kernel_page(last_pgtable);
		nocache_page(last_pgtable);
	}

	return last_pgtable;
}

static void __init map_node(int node)
{
#define PTRTREESIZE (256*1024)
#define ROOTTREESIZE (32*1024*1024)
	unsigned long physaddr, virtaddr, size;
	pgd_t *pgd_dir;
	pmd_t *pmd_dir;
	pte_t *pte_dir;

	size = m68k_memory[node].size;
	physaddr = m68k_memory[node].addr;
	virtaddr = (unsigned long)phys_to_virt(physaddr);
	physaddr |= 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();
#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();
				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();
				pmd_set(pmd_dir, pte_dir);
			}
			pte_dir = pte_offset_kernel(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
}

/*
 * paging_init() continues the virtual memory environment setup which
 * was begun by the code in arch/head.S.
 */
void __init paging_init(void)
{
	unsigned long zones_size[MAX_NR_ZONES] = { 0, };
	unsigned long min_addr, max_addr;
	unsigned long addr, size, end;
	int i;

#ifdef DEBUG
	printk ("start of paging_init (%p, %lx)\n", kernel_pg_dir, availmem);
#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;
	}

	min_addr = m68k_memory[0].addr;
	max_addr = min_addr + m68k_memory[0].size;
	for (i = 1; i < m68k_num_memory;) {
		if (m68k_memory[i].addr < min_addr) {
			printk("Ignoring memory chunk at 0x%lx:0x%lx before the first chunk\n",
				m68k_memory[i].addr, m68k_memory[i].size);
			printk("Fix your bootloader or use a memfile to make use of this area!\n");
			m68k_num_memory--;
			memmove(m68k_memory + i, m68k_memory + i + 1,
				(m68k_num_memory - i) * sizeof(struct mem_info));
			continue;
		}
		addr = m68k_memory[i].addr + m68k_memory[i].size;
		if (addr > max_addr)
			max_addr = addr;
		i++;
	}
	m68k_memoffset = min_addr - PAGE_OFFSET;
	m68k_virt_to_node_shift = fls(max_addr - min_addr - 1) - 6;

	module_fixup(NULL, __start_fixup, __stop_fixup);
	flush_icache();

	high_memory = phys_to_virt(max_addr);

	min_low_pfn = availmem >> PAGE_SHIFT;
	max_low_pfn = max_addr >> PAGE_SHIFT;

	for (i = 0; i < m68k_num_memory; i++) {
		addr = m68k_memory[i].addr;
		end = addr + m68k_memory[i].size;
		m68k_setup_node(i);
		availmem = PAGE_ALIGN(availmem);
		availmem += init_bootmem_node(NODE_DATA(i),
					      availmem >> PAGE_SHIFT,
					      addr >> PAGE_SHIFT,
					      end >> PAGE_SHIFT);
	}

	/*
	 * Map the physical memory available into the kernel virtual
	 * address space. First initialize the bootmem allocator with
	 * the memory we already mapped, so map_node() has something
	 * to allocate.
	 */
	addr = m68k_memory[0].addr;
	size = m68k_memory[0].size;
	free_bootmem_node(NODE_DATA(0), availmem, min(INIT_MAPPED_SIZE, size) - (availmem - addr));
	map_node(0);
	if (size > INIT_MAPPED_SIZE)
		free_bootmem_node(NODE_DATA(0), addr + INIT_MAPPED_SIZE, size - INIT_MAPPED_SIZE);

	for (i = 1; i < m68k_num_memory; i++)
		map_node(i);

	flush_tlb_all();

	/*
	 * initialize the bad page table and bad page to point
	 * to a couple of allocated pages
	 */
	empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);

	/*
	 * Set up SFC/DFC registers
	 */
	set_fs(KERNEL_DS);

#ifdef DEBUG
	printk ("before free_area_init\n");
#endif
	for (i = 0; i < m68k_num_memory; i++) {
		zones_size[ZONE_DMA] = m68k_memory[i].size >> PAGE_SHIFT;
		free_area_init_node(i, zones_size,
				    m68k_memory[i].addr >> PAGE_SHIFT, NULL);
	}
}

extern char __init_begin, __init_end;

void free_initmem(void)
{
	unsigned long addr;

	addr = (unsigned long)&__init_begin;
	for (; addr < (unsigned long)&__init_end; addr += PAGE_SIZE) {
		virt_to_page(addr)->flags &= ~(1 << PG_reserved);
		init_page_count(virt_to_page(addr));
		free_page(addr);
		totalram_pages++;
	}
}
Commit	Line	Data
1da177e4	1	/*
f30c2269	2	* linux/arch/m68k/mm/motorola.c
1da177e4 LT	3	*
	4	* Routines specific to the Motorola MMU, originally from:
	5	* linux/arch/m68k/init.c
	6	* which are Copyright (C) 1995 Hamish Macdonald
	7	*
	8	* Moved 8/20/1999 Sam Creasey
	9	*/
	10
1da177e4 LT	11	#include <linux/module.h>
	12	#include <linux/signal.h>
	13	#include <linux/sched.h>
	14	#include <linux/mm.h>
	15	#include <linux/swap.h>
	16	#include <linux/kernel.h>
	17	#include <linux/string.h>
	18	#include <linux/types.h>
	19	#include <linux/init.h>
	20	#include <linux/bootmem.h>
	21
	22	#include <asm/setup.h>
	23	#include <asm/uaccess.h>
	24	#include <asm/page.h>
	25	#include <asm/pgalloc.h>
	26	#include <asm/system.h>
	27	#include <asm/machdep.h>
	28	#include <asm/io.h>
	29	#include <asm/dma.h>
	30	#ifdef CONFIG_ATARI
	31	#include <asm/atari_stram.h>
	32	#endif
	33
	34	#undef DEBUG
	35
	36	#ifndef mm_cachebits
	37	/*
	38	* Bits to add to page descriptors for "normal" caching mode.
	39	* For 68020/030 this is 0.
	40	* For 68040, this is _PAGE_CACHE040 (cachable, copyback)
	41	*/
	42	unsigned long mm_cachebits;
	43	EXPORT_SYMBOL(mm_cachebits);
	44	#endif
	45
12d810c1 RZ	46	/* size of memory already mapped in head.S */
	47	#define INIT_MAPPED_SIZE (4UL<<20)
	48
	49	extern unsigned long availmem;
	50
1da177e4 LT	51	static pte_t * __init kernel_page_table(void)
	52	{
	53	pte_t *ptablep;
	54
	55	ptablep = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
	56
	57	clear_page(ptablep);
	58	__flush_page_to_ram(ptablep);
	59	flush_tlb_kernel_page(ptablep);
	60	nocache_page(ptablep);
	61
	62	return ptablep;
	63	}
	64
	65	static pmd_t *last_pgtable __initdata = NULL;
	66	pmd_t *zero_pgtable __initdata = NULL;
	67
	68	static pmd_t * __init kernel_ptr_table(void)
	69	{
	70	if (!last_pgtable) {
	71	unsigned long pmd, last;
	72	int i;
	73
	74	/* Find the last ptr table that was used in head.S and
	75	* reuse the remaining space in that page for further
	76	* ptr tables.
	77	*/
	78	last = (unsigned long)kernel_pg_dir;
	79	for (i = 0; i < PTRS_PER_PGD; i++) {
	80	if (!pgd_present(kernel_pg_dir[i]))
	81	continue;
	82	pmd = __pgd_page(kernel_pg_dir[i]);
	83	if (pmd > last)
	84	last = pmd;
	85	}
	86
	87	last_pgtable = (pmd_t *)last;
	88	#ifdef DEBUG
	89	printk("kernel_ptr_init: %p\n", last_pgtable);
	90	#endif
	91	}
	92
	93	last_pgtable += PTRS_PER_PMD;
	94	if (((unsigned long)last_pgtable & ~PAGE_MASK) == 0) {
	95	last_pgtable = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);
	96
	97	clear_page(last_pgtable);
	98	__flush_page_to_ram(last_pgtable);
	99	flush_tlb_kernel_page(last_pgtable);
	100	nocache_page(last_pgtable);
	101	}
	102
	103	return last_pgtable;
	104	}
	105
12d810c1	106	static void __init map_node(int node)
1da177e4 LT	107	{
	108	#define PTRTREESIZE (256*1024)
	109	#define ROOTTREESIZE (3210241024)
12d810c1	110	unsigned long physaddr, virtaddr, size;
1da177e4 LT	111	pgd_t *pgd_dir;
	112	pmd_t *pmd_dir;
	113	pte_t *pte_dir;
	114
12d810c1 RZ	115	size = m68k_memory[node].size;
	116	physaddr = m68k_memory[node].addr;
	117	virtaddr = (unsigned long)phys_to_virt(physaddr);
	118	physaddr \|= m68k_supervisor_cachemode \|
	119	_PAGE_PRESENT \| _PAGE_ACCESSED \| _PAGE_DIRTY;
1da177e4 LT	120	if (CPU_IS_040_OR_060)
	121	physaddr \|= _PAGE_GLOBAL040;
	122
	123	while (size > 0) {
	124	#ifdef DEBUG
	125	if (!(virtaddr & (PTRTREESIZE-1)))
	126	printk ("\npa=%#lx va=%#lx ", physaddr & PAGE_MASK,
	127	virtaddr);
	128	#endif
	129	pgd_dir = pgd_offset_k(virtaddr);
	130	if (virtaddr && CPU_IS_020_OR_030) {
	131	if (!(virtaddr & (ROOTTREESIZE-1)) &&
	132	size >= ROOTTREESIZE) {
	133	#ifdef DEBUG
	134	printk ("[very early term]");
	135	#endif
	136	pgd_val(*pgd_dir) = physaddr;
	137	size -= ROOTTREESIZE;
	138	virtaddr += ROOTTREESIZE;
	139	physaddr += ROOTTREESIZE;
	140	continue;
	141	}
	142	}
	143	if (!pgd_present(*pgd_dir)) {
	144	pmd_dir = kernel_ptr_table();
	145	#ifdef DEBUG
	146	printk ("[new pointer %p]", pmd_dir);
	147	#endif
	148	pgd_set(pgd_dir, pmd_dir);
	149	} else
	150	pmd_dir = pmd_offset(pgd_dir, virtaddr);
	151
	152	if (CPU_IS_020_OR_030) {
	153	if (virtaddr) {
	154	#ifdef DEBUG
	155	printk ("[early term]");
	156	#endif
	157	pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr;
	158	physaddr += PTRTREESIZE;
	159	} else {
	160	int i;
	161	#ifdef DEBUG
	162	printk ("[zero map]");
	163	#endif
	164	zero_pgtable = kernel_ptr_table();
	165	pte_dir = (pte_t *)zero_pgtable;
	166	pmd_dir->pmd[0] = virt_to_phys(pte_dir) \|
	167	_PAGE_TABLE \| _PAGE_ACCESSED;
	168	pte_val(*pte_dir++) = 0;
	169	physaddr += PAGE_SIZE;
	170	for (i = 1; i < 64; physaddr += PAGE_SIZE, i++)
	171	pte_val(*pte_dir++) = physaddr;
	172	}
	173	size -= PTRTREESIZE;
	174	virtaddr += PTRTREESIZE;
	175	} else {
	176	if (!pmd_present(*pmd_dir)) {
	177	#ifdef DEBUG
	178	printk ("[new table]");
	179	#endif
	180	pte_dir = kernel_page_table();
	181	pmd_set(pmd_dir, pte_dir);
	182	}
	183	pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
184
185	if (virtaddr) {
186	if (!pte_present(*pte_dir))
187	pte_val(*pte_dir) = physaddr;
188	} else
189	pte_val(*pte_dir) = 0;
190	size -= PAGE_SIZE;
191	virtaddr += PAGE_SIZE;
192	physaddr += PAGE_SIZE;
193	}
194
195	}
196	#ifdef DEBUG
197	printk("\n");
198	#endif
1da177e4 LT	199	}
	200
	201	/*
	202	* paging_init() continues the virtual memory environment setup which
	203	* was begun by the code in arch/head.S.
	204	*/
	205	void __init paging_init(void)
	206	{
2dcf15b7	207	unsigned long zones_size[MAX_NR_ZONES] = { 0, };
12d810c1 RZ	208	unsigned long min_addr, max_addr;
	209	unsigned long addr, size, end;
	210	int i;
1da177e4 LT	211
1da177e4 LT	212	#ifdef DEBUG
fb425d0b	213	printk ("start of paging_init (%p, %lx)\n", kernel_pg_dir, availmem);
1da177e4 LT	214	#endif
	215
	216	/* Fix the cache mode in the page descriptors for the 680[46]0. */
	217	if (CPU_IS_040_OR_060) {
	218	int i;
	219	#ifndef mm_cachebits
	220	mm_cachebits = _PAGE_CACHE040;
	221	#endif
	222	for (i = 0; i < 16; i++)
	223	pgprot_val(protection_map[i]) \|= _PAGE_CACHE040;
	224	}
	225
12d810c1 RZ	226	min_addr = m68k_memory[0].addr;
	227	max_addr = min_addr + m68k_memory[0].size;
	228	for (i = 1; i < m68k_num_memory;) {
	229	if (m68k_memory[i].addr < min_addr) {
	230	printk("Ignoring memory chunk at 0x%lx:0x%lx before the first chunk\n",
	231	m68k_memory[i].addr, m68k_memory[i].size);
	232	printk("Fix your bootloader or use a memfile to make use of this area!\n");
	233	m68k_num_memory--;
	234	memmove(m68k_memory + i, m68k_memory + i + 1,
	235	(m68k_num_memory - i) * sizeof(struct mem_info));
	236	continue;
	237	}
	238	addr = m68k_memory[i].addr + m68k_memory[i].size;
	239	if (addr > max_addr)
	240	max_addr = addr;
	241	i++;
	242	}
	243	m68k_memoffset = min_addr - PAGE_OFFSET;
	244	m68k_virt_to_node_shift = fls(max_addr - min_addr - 1) - 6;
	245
fbe9c961 RZ	246	module_fixup(NULL, __start_fixup, __stop_fixup);
	247	flush_icache();
	248
12d810c1 RZ	249	high_memory = phys_to_virt(max_addr);
	250
	251	min_low_pfn = availmem >> PAGE_SHIFT;
	252	max_low_pfn = max_addr >> PAGE_SHIFT;
	253
	254	for (i = 0; i < m68k_num_memory; i++) {
	255	addr = m68k_memory[i].addr;
	256	end = addr + m68k_memory[i].size;
	257	m68k_setup_node(i);
	258	availmem = PAGE_ALIGN(availmem);
	259	availmem += init_bootmem_node(NODE_DATA(i),
	260	availmem >> PAGE_SHIFT,
	261	addr >> PAGE_SHIFT,
	262	end >> PAGE_SHIFT);
	263	}
	264
1da177e4 LT	265	/*
1da177e4 LT	266	* Map the physical memory available into the kernel virtual
12d810c1 RZ	267	* address space. First initialize the bootmem allocator with
	268	* the memory we already mapped, so map_node() has something
	269	* to allocate.
1da177e4	270	*/
12d810c1 RZ	271	addr = m68k_memory[0].addr;
	272	size = m68k_memory[0].size;
	273	free_bootmem_node(NODE_DATA(0), availmem, min(INIT_MAPPED_SIZE, size) - (availmem - addr));
	274	map_node(0);
	275	if (size > INIT_MAPPED_SIZE)
	276	free_bootmem_node(NODE_DATA(0), addr + INIT_MAPPED_SIZE, size - INIT_MAPPED_SIZE);
1da177e4	277
12d810c1 RZ	278	for (i = 1; i < m68k_num_memory; i++)
12d810c1 RZ	279	map_node(i);
1da177e4 LT	280
1da177e4 LT	281	flush_tlb_all();
1da177e4 LT	282
	283	/*
	284	* initialize the bad page table and bad page to point
	285	* to a couple of allocated pages
	286	*/
	287	empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
1da177e4 LT	288
	289	/*
	290	* Set up SFC/DFC registers
	291	*/
	292	set_fs(KERNEL_DS);
	293
	294	#ifdef DEBUG
	295	printk ("before free_area_init\n");
	296	#endif
12d810c1 RZ	297	for (i = 0; i < m68k_num_memory; i++) {
12d810c1 RZ	298	zones_size[ZONE_DMA] = m68k_memory[i].size >> PAGE_SHIFT;
9109fb7b	299	free_area_init_node(i, zones_size,
12d810c1 RZ	300	m68k_memory[i].addr >> PAGE_SHIFT, NULL);
12d810c1 RZ	301	}
1da177e4 LT	302	}
	303
	304	extern char __init_begin, __init_end;
	305
	306	void free_initmem(void)
	307	{
	308	unsigned long addr;
	309
	310	addr = (unsigned long)&__init_begin;
	311	for (; addr < (unsigned long)&__init_end; addr += PAGE_SIZE) {
	312	virt_to_page(addr)->flags &= ~(1 << PG_reserved);
7835e98b	313	init_page_count(virt_to_page(addr));
1da177e4 LT	314	free_page(addr);
	315	totalram_pages++;
	316	}
	317	}
	318
	319