[deliverable/linux.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 <linux/gfp.h>

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

#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 */
extern __initdata unsigned long m68k_init_mapped_size;

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 m68k_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(m68k_init_mapped_size, size) - (availmem - addr));
	map_node(0);
	if (size > m68k_init_mapped_size)
		free_bootmem_node(NODE_DATA(0), addr + m68k_init_mapped_size,
				  size - m68k_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);
		if (node_present_pages(i))
			node_set_state(i, N_NORMAL_MEMORY);
	}
}
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>
5a0e3ad6	21	#include <linux/gfp.h>
1da177e4 LT	22
	23	#include <asm/setup.h>
	24	#include <asm/uaccess.h>
	25	#include <asm/page.h>
	26	#include <asm/pgalloc.h>
1da177e4 LT	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
c85627fb	33	#include <asm/sections.h>
1da177e4 LT	34
	35	#undef DEBUG
	36
	37	#ifndef mm_cachebits
	38	/*
	39	* Bits to add to page descriptors for "normal" caching mode.
	40	* For 68020/030 this is 0.
	41	* For 68040, this is _PAGE_CACHE040 (cachable, copyback)
	42	*/
	43	unsigned long mm_cachebits;
	44	EXPORT_SYMBOL(mm_cachebits);
	45	#endif
	46
12d810c1	47	/* size of memory already mapped in head.S */
486df8bc	48	extern __initdata unsigned long m68k_init_mapped_size;
12d810c1 RZ	49
	50	extern unsigned long availmem;
	51
1da177e4 LT	52	static pte_t * __init kernel_page_table(void)
	53	{
	54	pte_t *ptablep;
	55
	56	ptablep = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
	57
	58	clear_page(ptablep);
	59	__flush_page_to_ram(ptablep);
	60	flush_tlb_kernel_page(ptablep);
	61	nocache_page(ptablep);
	62
	63	return ptablep;
	64	}
	65
	66	static pmd_t *last_pgtable __initdata = NULL;
	67	pmd_t *zero_pgtable __initdata = NULL;
	68
	69	static pmd_t * __init kernel_ptr_table(void)
	70	{
	71	if (!last_pgtable) {
	72	unsigned long pmd, last;
	73	int i;
	74
	75	/* Find the last ptr table that was used in head.S and
	76	* reuse the remaining space in that page for further
	77	* ptr tables.
	78	*/
	79	last = (unsigned long)kernel_pg_dir;
	80	for (i = 0; i < PTRS_PER_PGD; i++) {
	81	if (!pgd_present(kernel_pg_dir[i]))
	82	continue;
	83	pmd = __pgd_page(kernel_pg_dir[i]);
	84	if (pmd > last)
	85	last = pmd;
	86	}
	87
	88	last_pgtable = (pmd_t *)last;
	89	#ifdef DEBUG
	90	printk("kernel_ptr_init: %p\n", last_pgtable);
	91	#endif
	92	}
	93
	94	last_pgtable += PTRS_PER_PMD;
	95	if (((unsigned long)last_pgtable & ~PAGE_MASK) == 0) {
	96	last_pgtable = (pmd_t *)alloc_bootmem_low_pages(PAGE_SIZE);
	97
	98	clear_page(last_pgtable);
	99	__flush_page_to_ram(last_pgtable);
	100	flush_tlb_kernel_page(last_pgtable);
	101	nocache_page(last_pgtable);
	102	}
	103
	104	return last_pgtable;
	105	}
	106
12d810c1	107	static void __init map_node(int node)
1da177e4 LT	108	{
	109	#define PTRTREESIZE (256*1024)
	110	#define ROOTTREESIZE (3210241024)
12d810c1	111	unsigned long physaddr, virtaddr, size;
1da177e4 LT	112	pgd_t *pgd_dir;
	113	pmd_t *pmd_dir;
	114	pte_t *pte_dir;
	115
12d810c1 RZ	116	size = m68k_memory[node].size;
	117	physaddr = m68k_memory[node].addr;
	118	virtaddr = (unsigned long)phys_to_virt(physaddr);
	119	physaddr \|= m68k_supervisor_cachemode \|
	120	_PAGE_PRESENT \| _PAGE_ACCESSED \| _PAGE_DIRTY;
1da177e4 LT	121	if (CPU_IS_040_OR_060)
	122	physaddr \|= _PAGE_GLOBAL040;
	123
	124	while (size > 0) {
	125	#ifdef DEBUG
	126	if (!(virtaddr & (PTRTREESIZE-1)))
	127	printk ("\npa=%#lx va=%#lx ", physaddr & PAGE_MASK,
	128	virtaddr);
	129	#endif
	130	pgd_dir = pgd_offset_k(virtaddr);
	131	if (virtaddr && CPU_IS_020_OR_030) {
	132	if (!(virtaddr & (ROOTTREESIZE-1)) &&
	133	size >= ROOTTREESIZE) {
	134	#ifdef DEBUG
	135	printk ("[very early term]");
	136	#endif
	137	pgd_val(*pgd_dir) = physaddr;
	138	size -= ROOTTREESIZE;
	139	virtaddr += ROOTTREESIZE;
	140	physaddr += ROOTTREESIZE;
	141	continue;
	142	}
	143	}
	144	if (!pgd_present(*pgd_dir)) {
	145	pmd_dir = kernel_ptr_table();
	146	#ifdef DEBUG
	147	printk ("[new pointer %p]", pmd_dir);
	148	#endif
	149	pgd_set(pgd_dir, pmd_dir);
	150	} else
	151	pmd_dir = pmd_offset(pgd_dir, virtaddr);
	152
	153	if (CPU_IS_020_OR_030) {
	154	if (virtaddr) {
	155	#ifdef DEBUG
	156	printk ("[early term]");
	157	#endif
	158	pmd_dir->pmd[(virtaddr/PTRTREESIZE) & 15] = physaddr;
	159	physaddr += PTRTREESIZE;
	160	} else {
	161	int i;
	162	#ifdef DEBUG
	163	printk ("[zero map]");
	164	#endif
	165	zero_pgtable = kernel_ptr_table();
	166	pte_dir = (pte_t *)zero_pgtable;
	167	pmd_dir->pmd[0] = virt_to_phys(pte_dir) \|
	168	_PAGE_TABLE \| _PAGE_ACCESSED;
	169	pte_val(*pte_dir++) = 0;
	170	physaddr += PAGE_SIZE;
	171	for (i = 1; i < 64; physaddr += PAGE_SIZE, i++)
	172	pte_val(*pte_dir++) = physaddr;
	173	}
	174	size -= PTRTREESIZE;
	175	virtaddr += PTRTREESIZE;
	176	} else {
	177	if (!pmd_present(*pmd_dir)) {
	178	#ifdef DEBUG
	179	printk ("[new table]");
	180	#endif
	181	pte_dir = kernel_page_table();
	182	pmd_set(pmd_dir, pte_dir);
	183	}
	184	pte_dir = pte_offset_kernel(pmd_dir, virtaddr);
185
186	if (virtaddr) {
187	if (!pte_present(*pte_dir))
188	pte_val(*pte_dir) = physaddr;
189	} else
190	pte_val(*pte_dir) = 0;
191	size -= PAGE_SIZE;
192	virtaddr += PAGE_SIZE;
193	physaddr += PAGE_SIZE;
194	}
195
196	}
197	#ifdef DEBUG
198	printk("\n");
199	#endif
1da177e4 LT	200	}
	201
	202	/*
	203	* paging_init() continues the virtual memory environment setup which
	204	* was begun by the code in arch/head.S.
	205	*/
	206	void __init paging_init(void)
	207	{
2dcf15b7	208	unsigned long zones_size[MAX_NR_ZONES] = { 0, };
12d810c1 RZ	209	unsigned long min_addr, max_addr;
	210	unsigned long addr, size, end;
	211	int i;
1da177e4 LT	212
1da177e4 LT	213	#ifdef DEBUG
fb425d0b	214	printk ("start of paging_init (%p, %lx)\n", kernel_pg_dir, availmem);
1da177e4 LT	215	#endif
	216
	217	/* Fix the cache mode in the page descriptors for the 680[46]0. */
	218	if (CPU_IS_040_OR_060) {
	219	int i;
	220	#ifndef mm_cachebits
	221	mm_cachebits = _PAGE_CACHE040;
	222	#endif
	223	for (i = 0; i < 16; i++)
	224	pgprot_val(protection_map[i]) \|= _PAGE_CACHE040;
	225	}
	226
12d810c1 RZ	227	min_addr = m68k_memory[0].addr;
	228	max_addr = min_addr + m68k_memory[0].size;
	229	for (i = 1; i < m68k_num_memory;) {
	230	if (m68k_memory[i].addr < min_addr) {
	231	printk("Ignoring memory chunk at 0x%lx:0x%lx before the first chunk\n",
	232	m68k_memory[i].addr, m68k_memory[i].size);
	233	printk("Fix your bootloader or use a memfile to make use of this area!\n");
	234	m68k_num_memory--;
	235	memmove(m68k_memory + i, m68k_memory + i + 1,
79930084	236	(m68k_num_memory - i) * sizeof(struct m68k_mem_info));
12d810c1 RZ	237	continue;
	238	}
	239	addr = m68k_memory[i].addr + m68k_memory[i].size;
	240	if (addr > max_addr)
	241	max_addr = addr;
	242	i++;
	243	}
	244	m68k_memoffset = min_addr - PAGE_OFFSET;
	245	m68k_virt_to_node_shift = fls(max_addr - min_addr - 1) - 6;
	246
fbe9c961 RZ	247	module_fixup(NULL, __start_fixup, __stop_fixup);
	248	flush_icache();
	249
12d810c1 RZ	250	high_memory = phys_to_virt(max_addr);
	251
	252	min_low_pfn = availmem >> PAGE_SHIFT;
	253	max_low_pfn = max_addr >> PAGE_SHIFT;
	254
	255	for (i = 0; i < m68k_num_memory; i++) {
	256	addr = m68k_memory[i].addr;
	257	end = addr + m68k_memory[i].size;
	258	m68k_setup_node(i);
	259	availmem = PAGE_ALIGN(availmem);
	260	availmem += init_bootmem_node(NODE_DATA(i),
	261	availmem >> PAGE_SHIFT,
	262	addr >> PAGE_SHIFT,
	263	end >> PAGE_SHIFT);
	264	}
	265
1da177e4 LT	266	/*
1da177e4 LT	267	* Map the physical memory available into the kernel virtual
12d810c1 RZ	268	* address space. First initialize the bootmem allocator with
	269	* the memory we already mapped, so map_node() has something
	270	* to allocate.
1da177e4	271	*/
12d810c1 RZ	272	addr = m68k_memory[0].addr;
12d810c1 RZ	273	size = m68k_memory[0].size;
486df8bc AS	274	free_bootmem_node(NODE_DATA(0), availmem,
486df8bc AS	275	min(m68k_init_mapped_size, size) - (availmem - addr));
12d810c1	276	map_node(0);
486df8bc AS	277	if (size > m68k_init_mapped_size)
	278	free_bootmem_node(NODE_DATA(0), addr + m68k_init_mapped_size,
	279	size - m68k_init_mapped_size);
1da177e4	280
12d810c1 RZ	281	for (i = 1; i < m68k_num_memory; i++)
12d810c1 RZ	282	map_node(i);
1da177e4 LT	283
1da177e4 LT	284	flush_tlb_all();
1da177e4 LT	285
	286	/*
	287	* initialize the bad page table and bad page to point
	288	* to a couple of allocated pages
	289	*/
	290	empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
1da177e4 LT	291
	292	/*
	293	* Set up SFC/DFC registers
	294	*/
	295	set_fs(KERNEL_DS);
	296
	297	#ifdef DEBUG
	298	printk ("before free_area_init\n");
	299	#endif
12d810c1 RZ	300	for (i = 0; i < m68k_num_memory; i++) {
12d810c1 RZ	301	zones_size[ZONE_DMA] = m68k_memory[i].size >> PAGE_SHIFT;
9109fb7b	302	free_area_init_node(i, zones_size,
12d810c1	303	m68k_memory[i].addr >> PAGE_SHIFT, NULL);
4aac0b48 MS	304	if (node_present_pages(i))
4aac0b48 MS	305	node_set_state(i, N_NORMAL_MEMORY);
12d810c1	306	}
1da177e4 LT	307	}
1da177e4 LT	308