[mirror_ubuntu-artful-kernel.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/pagemap.h>
#include <linux/spinlock.h>
#include <linux/module.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>
#include <asm/io.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);
	fixup_early_ioremap();
	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>
1da177e4 LT	9	#include <linux/pagemap.h>
1da177e4 LT	10	#include <linux/spinlock.h>
052e7994	11	#include <linux/module.h>
1da177e4	12
1da177e4 LT	13	#include <asm/pgtable.h>
	14	#include <asm/pgalloc.h>
	15	#include <asm/fixmap.h>
	16	#include <asm/e820.h>
	17	#include <asm/tlb.h>
	18	#include <asm/tlbflush.h>
56f0e74c	19	#include <asm/io.h>
1da177e4	20
2b688dfd PE	21	unsigned int __VMALLOC_RESERVE = 128 << 20;
2b688dfd PE	22
1da177e4 LT	23	/*
	24	* Associate a virtual page frame with a given physical page frame
	25	* and protection flags for that frame.
	26	*/
d494a961	27	void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
1da177e4 LT	28	{
	29	pgd_t *pgd;
	30	pud_t *pud;
	31	pmd_t *pmd;
	32	pte_t *pte;
	33
	34	pgd = swapper_pg_dir + pgd_index(vaddr);
	35	if (pgd_none(*pgd)) {
	36	BUG();
	37	return;
	38	}
	39	pud = pud_offset(pgd, vaddr);
	40	if (pud_none(*pud)) {
	41	BUG();
	42	return;
	43	}
	44	pmd = pmd_offset(pud, vaddr);
	45	if (pmd_none(*pmd)) {
	46	BUG();
	47	return;
	48	}
	49	pte = pte_offset_kernel(pmd, vaddr);
d494a961	50	if (pte_val(pteval))
b40c7579	51	set_pte_at(&init_mm, vaddr, pte, pteval);
b0bfece4 JB	52	else
b0bfece4 JB	53	pte_clear(&init_mm, vaddr, pte);
1da177e4 LT	54
	55	/*
	56	* It's enough to flush this one mapping.
	57	* (PGE mappings get flushed as well)
	58	*/
	59	__flush_tlb_one(vaddr);
	60	}
	61
	62	/*
	63	* Associate a large virtual page frame with a given physical page frame
	64	* and protection flags for that frame. pfn is for the base of the page,
	65	* vaddr is what the page gets mapped to - both must be properly aligned.
	66	* The pmd must already be instantiated. Assumes PAE mode.
	67	*/
	68	void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags)
	69	{
	70	pgd_t *pgd;
	71	pud_t *pud;
	72	pmd_t *pmd;
	73
	74	if (vaddr & (PMD_SIZE-1)) { /* vaddr is misaligned */
f90e7185	75	printk(KERN_WARNING "set_pmd_pfn: vaddr misaligned\n");
1da177e4 LT	76	return; /* BUG(); */
	77	}
	78	if (pfn & (PTRS_PER_PTE-1)) { /* pfn is misaligned */
f90e7185	79	printk(KERN_WARNING "set_pmd_pfn: pfn misaligned\n");
1da177e4 LT	80	return; /* BUG(); */
	81	}
	82	pgd = swapper_pg_dir + pgd_index(vaddr);
	83	if (pgd_none(*pgd)) {
f90e7185	84	printk(KERN_WARNING "set_pmd_pfn: pgd_none\n");
1da177e4 LT	85	return; /* BUG(); */
	86	}
	87	pud = pud_offset(pgd, vaddr);
	88	pmd = pmd_offset(pud, vaddr);
	89	set_pmd(pmd, pfn_pmd(pfn, flags));
	90	/*
	91	* It's enough to flush this one mapping.
	92	* (PGE mappings get flushed as well)
	93	*/
	94	__flush_tlb_one(vaddr);
	95	}
	96
052e7994 JF	97	unsigned long __FIXADDR_TOP = 0xfffff000;
052e7994 JF	98	EXPORT_SYMBOL(__FIXADDR_TOP);
052e7994	99
bef1568d YL	100	/*
	101	* vmalloc=size forces the vmalloc area to be exactly 'size'
	102	* bytes. This can be used to increase (or decrease) the
	103	* vmalloc area - the default is 128m.
	104	*/
	105	static int __init parse_vmalloc(char *arg)
	106	{
	107	if (!arg)
	108	return -EINVAL;
	109
e621bd18 DY	110	/* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/
e621bd18 DY	111	__VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET;
bef1568d YL	112	return 0;
	113	}
	114	early_param("vmalloc", parse_vmalloc);
	115
	116	/*
	117	* reservetop=size reserves a hole at the top of the kernel address space which
	118	* a hypervisor can load into later. Needed for dynamically loaded hypervisors,
	119	* so relocating the fixmap can be done before paging initialization.
	120	*/
	121	static int __init parse_reservetop(char *arg)
	122	{
	123	unsigned long address;
	124
	125	if (!arg)
	126	return -EINVAL;
	127
	128	address = memparse(arg, &arg);
	129	reserve_top_address(address);
e67a807f	130	fixup_early_ioremap();
bef1568d YL	131	return 0;
	132	}
	133	early_param("reservetop", parse_reservetop);