[linux-2.6-block.git] / arch / m68k / mm / sun3mmu.c

/*
 * linux/arch/m68k/mm/sun3mmu.c
 *
 * Implementations of mm routines specific to the sun3 MMU.
 *
 * Moved here 8/20/1999 Sam Creasey
 *
 */

#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/pgtable.h>
#include <asm/system.h>
#include <asm/machdep.h>
#include <asm/io.h>

extern void mmu_emu_init (unsigned long bootmem_end);

const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";

extern unsigned long num_pages;

void free_initmem(void)
{
}

/* For the sun3 we try to follow the i386 paging_init() more closely */
/* start_mem and end_mem have PAGE_OFFSET added already */
/* now sets up tables using sun3 PTEs rather than i386 as before. --m */
void __init paging_init(void)
{
	pgd_t * pg_dir;
	pte_t * pg_table;
	int i;
	unsigned long address;
	unsigned long next_pgtable;
	unsigned long bootmem_end;
	unsigned long zones_size[MAX_NR_ZONES] = { 0, };
	unsigned long size;

#ifdef TEST_VERIFY_AREA
	wp_works_ok = 0;
#endif
	empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
	memset(empty_zero_page, 0, PAGE_SIZE);

	address = PAGE_OFFSET;
	pg_dir = swapper_pg_dir;
	memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
	memset (kernel_pg_dir,  0, sizeof (kernel_pg_dir));

	size = num_pages * sizeof(pte_t);
	size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);

	next_pgtable = (unsigned long)alloc_bootmem_pages(size);
	bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;

	/* Map whole memory from PAGE_OFFSET (0x0E000000) */
	pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;

	while (address < (unsigned long)high_memory) {
		pg_table = (pte_t *) __pa (next_pgtable);
		next_pgtable += PTRS_PER_PTE * sizeof (pte_t);
		pgd_val(*pg_dir) = (unsigned long) pg_table;
		pg_dir++;

		/* now change pg_table to kernel virtual addresses */
		pg_table = (pte_t *) __va ((unsigned long) pg_table);
		for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
			pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
			if (address >= (unsigned long)high_memory)
				pte_val (pte) = 0;
			set_pte (pg_table, pte);
			address += PAGE_SIZE;
		}
	}

	mmu_emu_init(bootmem_end);

	current->mm = NULL;

	/* memory sizing is a hack stolen from motorola.c..  hope it works for us */
	zones_size[ZONE_DMA] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT;

	/* I really wish I knew why the following change made things better...  -- Sam */
/*	free_area_init(zones_size); */
	free_area_init_node(0, NODE_DATA(0), zones_size,
			    (__pa(PAGE_OFFSET) >> PAGE_SHIFT) + 1, NULL);


}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/arch/m68k/mm/sun3mmu.c
	3	*
	4	* Implementations of mm routines specific to the sun3 MMU.
	5	*
	6	* Moved here 8/20/1999 Sam Creasey
	7	*
	8	*/
	9
	10	#include <linux/signal.h>
	11	#include <linux/sched.h>
	12	#include <linux/mm.h>
	13	#include <linux/swap.h>
	14	#include <linux/kernel.h>
	15	#include <linux/string.h>
	16	#include <linux/types.h>
	17	#include <linux/init.h>
	18	#include <linux/bootmem.h>
	19
	20	#include <asm/setup.h>
	21	#include <asm/uaccess.h>
	22	#include <asm/page.h>
	23	#include <asm/pgtable.h>
	24	#include <asm/system.h>
	25	#include <asm/machdep.h>
	26	#include <asm/io.h>
	27
	28	extern void mmu_emu_init (unsigned long bootmem_end);
	29
	30	const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";
	31
	32	extern unsigned long num_pages;
	33
	34	void free_initmem(void)
	35	{
	36	}
	37
	38	/* For the sun3 we try to follow the i386 paging_init() more closely */
	39	/* start_mem and end_mem have PAGE_OFFSET added already */
	40	/* now sets up tables using sun3 PTEs rather than i386 as before. --m */
	41	void __init paging_init(void)
	42	{
	43	pgd_t * pg_dir;
	44	pte_t * pg_table;
	45	int i;
	46	unsigned long address;
	47	unsigned long next_pgtable;
	48	unsigned long bootmem_end;
2dcf15b7	49	unsigned long zones_size[MAX_NR_ZONES] = { 0, };
1da177e4 LT	50	unsigned long size;
1da177e4 LT	51
1da177e4 LT	52	#ifdef TEST_VERIFY_AREA
	53	wp_works_ok = 0;
	54	#endif
	55	empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
	56	memset(empty_zero_page, 0, PAGE_SIZE);
	57
	58	address = PAGE_OFFSET;
	59	pg_dir = swapper_pg_dir;
	60	memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
	61	memset (kernel_pg_dir, 0, sizeof (kernel_pg_dir));
	62
	63	size = num_pages * sizeof(pte_t);
	64	size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
	65
	66	next_pgtable = (unsigned long)alloc_bootmem_pages(size);
	67	bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
	68
	69	/* Map whole memory from PAGE_OFFSET (0x0E000000) */
	70	pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
	71
	72	while (address < (unsigned long)high_memory) {
	73	pg_table = (pte_t *) __pa (next_pgtable);
	74	next_pgtable += PTRS_PER_PTE * sizeof (pte_t);
	75	pgd_val(*pg_dir) = (unsigned long) pg_table;
	76	pg_dir++;
	77
	78	/* now change pg_table to kernel virtual addresses */
	79	pg_table = (pte_t *) __va ((unsigned long) pg_table);
	80	for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
	81	pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
	82	if (address >= (unsigned long)high_memory)
	83	pte_val (pte) = 0;
	84	set_pte (pg_table, pte);
	85	address += PAGE_SIZE;
	86	}
	87	}
	88
	89	mmu_emu_init(bootmem_end);
	90
	91	current->mm = NULL;
	92
	93	/* memory sizing is a hack stolen from motorola.c.. hope it works for us */
2dcf15b7	94	zones_size[ZONE_DMA] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT;
1da177e4	95
a3a79bd7 SC	96	/* I really wish I knew why the following change made things better... -- Sam */
	97	/* free_area_init(zones_size); */
	98	free_area_init_node(0, NODE_DATA(0), zones_size,
	99	(__pa(PAGE_OFFSET) >> PAGE_SHIFT) + 1, NULL);
	100
1da177e4 LT	101
	102	}
	103
	104