[deliverable/linux.git] / arch / x86 / mm / pgtable_32.c

#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/nmi.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/highmem.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/quicklist.h>

#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/fixmap.h>
#include <asm/e820.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>

unsigned int __VMALLOC_RESERVE = 128 << 20;

/*
 * Associate a virtual page frame with a given physical page frame 
 * and protection flags for that frame.
 */ 
void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
{
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;

	pgd = swapper_pg_dir + pgd_index(vaddr);
	if (pgd_none(*pgd)) {
		BUG();
		return;
	}
	pud = pud_offset(pgd, vaddr);
	if (pud_none(*pud)) {
		BUG();
		return;
	}
	pmd = pmd_offset(pud, vaddr);
	if (pmd_none(*pmd)) {
		BUG();
		return;
	}
	pte = pte_offset_kernel(pmd, vaddr);
	if (pte_val(pteval))
		set_pte_at(&init_mm, vaddr, pte, pteval);
	else
		pte_clear(&init_mm, vaddr, pte);

	/*
	 * It's enough to flush this one mapping.
	 * (PGE mappings get flushed as well)
	 */
	__flush_tlb_one(vaddr);
}

/*
 * Associate a large virtual page frame with a given physical page frame 
 * and protection flags for that frame. pfn is for the base of the page,
 * vaddr is what the page gets mapped to - both must be properly aligned. 
 * The pmd must already be instantiated. Assumes PAE mode.
 */ 
void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
{
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;

	if (vaddr & (PMD_SIZE-1)) {		/* vaddr is misaligned */
		printk(KERN_WARNING "set_pmd_pfn: vaddr misaligned\n");
		return; /* BUG(); */
	}
	if (pfn & (PTRS_PER_PTE-1)) {		/* pfn is misaligned */
		printk(KERN_WARNING "set_pmd_pfn: pfn misaligned\n");
		return; /* BUG(); */
	}
	pgd = swapper_pg_dir + pgd_index(vaddr);
	if (pgd_none(*pgd)) {
		printk(KERN_WARNING "set_pmd_pfn: pgd_none\n");
		return; /* BUG(); */
	}
	pud = pud_offset(pgd, vaddr);
	pmd = pmd_offset(pud, vaddr);
	set_pmd(pmd, pfn_pmd(pfn, flags));
	/*
	 * It's enough to flush this one mapping.
	 * (PGE mappings get flushed as well)
	 */
	__flush_tlb_one(vaddr);
}

unsigned long __FIXADDR_TOP = 0xfffff000;
EXPORT_SYMBOL(__FIXADDR_TOP);

/*
 * vmalloc=size forces the vmalloc area to be exactly 'size'
 * bytes. This can be used to increase (or decrease) the
 * vmalloc area - the default is 128m.
 */
static int __init parse_vmalloc(char *arg)
{
	if (!arg)
		return -EINVAL;

	/* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/
	__VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET;
	return 0;
}
early_param("vmalloc", parse_vmalloc);

/*
 * reservetop=size reserves a hole at the top of the kernel address space which
 * a hypervisor can load into later.  Needed for dynamically loaded hypervisors,
 * so relocating the fixmap can be done before paging initialization.
 */
static int __init parse_reservetop(char *arg)
{
	unsigned long address;

	if (!arg)
		return -EINVAL;

	address = memparse(arg, &arg);
	reserve_top_address(address);
	return 0;
}
early_param("reservetop", parse_reservetop);
Commit	Line	Data
1da177e4 LT	1	#include <linux/sched.h>
	2	#include <linux/kernel.h>
	3	#include <linux/errno.h>
	4	#include <linux/mm.h>
27eb0b28	5	#include <linux/nmi.h>
1da177e4 LT	6	#include <linux/swap.h>
	7	#include <linux/smp.h>
	8	#include <linux/highmem.h>
	9	#include <linux/slab.h>
	10	#include <linux/pagemap.h>
	11	#include <linux/spinlock.h>
052e7994	12	#include <linux/module.h>
f1d1a842	13	#include <linux/quicklist.h>
1da177e4 LT	14
	15	#include <asm/system.h>
	16	#include <asm/pgtable.h>
	17	#include <asm/pgalloc.h>
	18	#include <asm/fixmap.h>
	19	#include <asm/e820.h>
	20	#include <asm/tlb.h>
	21	#include <asm/tlbflush.h>
	22
2b688dfd PE	23	unsigned int __VMALLOC_RESERVE = 128 << 20;
2b688dfd PE	24
1da177e4 LT	25	/*
	26	* Associate a virtual page frame with a given physical page frame
	27	* and protection flags for that frame.
	28	*/
d494a961	29	void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
1da177e4 LT	30	{
	31	pgd_t *pgd;
	32	pud_t *pud;
	33	pmd_t *pmd;
	34	pte_t *pte;
	35
	36	pgd = swapper_pg_dir + pgd_index(vaddr);
	37	if (pgd_none(*pgd)) {
	38	BUG();
	39	return;
	40	}
	41	pud = pud_offset(pgd, vaddr);
	42	if (pud_none(*pud)) {
	43	BUG();
	44	return;
	45	}
	46	pmd = pmd_offset(pud, vaddr);
	47	if (pmd_none(*pmd)) {
	48	BUG();
	49	return;
	50	}
	51	pte = pte_offset_kernel(pmd, vaddr);
d494a961	52	if (pte_val(pteval))
b40c7579	53	set_pte_at(&init_mm, vaddr, pte, pteval);
b0bfece4 JB	54	else
b0bfece4 JB	55	pte_clear(&init_mm, vaddr, pte);
1da177e4 LT	56
	57	/*
	58	* It's enough to flush this one mapping.
	59	* (PGE mappings get flushed as well)
	60	*/
	61	__flush_tlb_one(vaddr);
	62	}
	63
	64	/*
	65	* Associate a large virtual page frame with a given physical page frame
	66	* and protection flags for that frame. pfn is for the base of the page,
	67	* vaddr is what the page gets mapped to - both must be properly aligned.
	68	* The pmd must already be instantiated. Assumes PAE mode.
	69	*/
	70	void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
	71	{
	72	pgd_t *pgd;
	73	pud_t *pud;
	74	pmd_t *pmd;
	75
	76	if (vaddr & (PMD_SIZE-1)) { /* vaddr is misaligned */
f90e7185	77	printk(KERN_WARNING "set_pmd_pfn: vaddr misaligned\n");
1da177e4 LT	78	return; /* BUG(); */
	79	}
	80	if (pfn & (PTRS_PER_PTE-1)) { /* pfn is misaligned */
f90e7185	81	printk(KERN_WARNING "set_pmd_pfn: pfn misaligned\n");
1da177e4 LT	82	return; /* BUG(); */
	83	}
	84	pgd = swapper_pg_dir + pgd_index(vaddr);
	85	if (pgd_none(*pgd)) {
f90e7185	86	printk(KERN_WARNING "set_pmd_pfn: pgd_none\n");
1da177e4 LT	87	return; /* BUG(); */
	88	}
	89	pud = pud_offset(pgd, vaddr);
	90	pmd = pmd_offset(pud, vaddr);
	91	set_pmd(pmd, pfn_pmd(pfn, flags));
	92	/*
	93	* It's enough to flush this one mapping.
	94	* (PGE mappings get flushed as well)
	95	*/
	96	__flush_tlb_one(vaddr);
	97	}
	98
052e7994 JF	99	unsigned long __FIXADDR_TOP = 0xfffff000;
052e7994 JF	100	EXPORT_SYMBOL(__FIXADDR_TOP);
052e7994	101
bef1568d YL	102	/*
	103	* vmalloc=size forces the vmalloc area to be exactly 'size'
	104	* bytes. This can be used to increase (or decrease) the
	105	* vmalloc area - the default is 128m.
	106	*/
	107	static int __init parse_vmalloc(char *arg)
	108	{
	109	if (!arg)
	110	return -EINVAL;
	111
e621bd18 DY	112	/* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/
e621bd18 DY	113	__VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET;
bef1568d YL	114	return 0;
	115	}
	116	early_param("vmalloc", parse_vmalloc);
	117
	118	/*
	119	* reservetop=size reserves a hole at the top of the kernel address space which
	120	* a hypervisor can load into later. Needed for dynamically loaded hypervisors,
	121	* so relocating the fixmap can be done before paging initialization.
	122	*/
	123	static int __init parse_reservetop(char *arg)
	124	{
	125	unsigned long address;
	126
	127	if (!arg)
	128	return -EINVAL;
	129
	130	address = memparse(arg, &arg);
	131	reserve_top_address(address);
	132	return 0;
	133	}
	134	early_param("reservetop", parse_reservetop);