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