[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 <asm/cpu_entry_area.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/fixmap.h>
#include <asm/e820/api.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;
	p4d_t *p4d;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;

	pgd = swapper_pg_dir + pgd_index(vaddr);
	if (pgd_none(*pgd)) {
		BUG();
		return;
	}
	p4d = p4d_offset(pgd, vaddr);
	if (p4d_none(*p4d)) {
		BUG();
		return;
	}
	pud = pud_offset(p4d, 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_none(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);
}

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);
	early_ioremap_init();
	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>
	10	#include <linux/spinlock.h>
	11
bda9eb32	12	#include <asm/cpu_entry_area.h>
1da177e4 LT	13	#include <asm/pgtable.h>
	14	#include <asm/pgalloc.h>
	15	#include <asm/fixmap.h>
66441bd3	16	#include <asm/e820/api.h>
1da177e4 LT	17	#include <asm/tlb.h>
1da177e4 LT	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	{
1da177e4 LT	29	pgd_t *pgd;
e0c4f675	30	p4d_t *p4d;
1da177e4 LT	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	}
e0c4f675 KS	40	p4d = p4d_offset(pgd, vaddr);
	41	if (p4d_none(*p4d)) {
	42	BUG();
	43	return;
	44	}
	45	pud = pud_offset(p4d, vaddr);
1da177e4 LT	46	if (pud_none(*pud)) {
	47	BUG();
	48	return;
	49	}
	50	pmd = pmd_offset(pud, vaddr);
	51	if (pmd_none(*pmd)) {
	52	BUG();
	53	return;
	54	}
	55	pte = pte_offset_kernel(pmd, vaddr);
dcb32d99	56	if (!pte_none(pteval))
b40c7579	57	set_pte_at(&init_mm, vaddr, pte, pteval);
b0bfece4 JB	58	else
b0bfece4 JB	59	pte_clear(&init_mm, vaddr, pte);
1da177e4 LT	60
	61	/*
	62	* It's enough to flush this one mapping.
	63	* (PGE mappings get flushed as well)
1da177e4 LT	64	*/
	65	__flush_tlb_one(vaddr);
	66	}
	67
052e7994 JF	68	unsigned long __FIXADDR_TOP = 0xfffff000;
052e7994 JF	69	EXPORT_SYMBOL(__FIXADDR_TOP);
052e7994	70
bef1568d YL	71	/*
	72	* vmalloc=size forces the vmalloc area to be exactly 'size'
	73	* bytes. This can be used to increase (or decrease) the
	74	* vmalloc area - the default is 128m.
	75	*/
	76	static int __init parse_vmalloc(char *arg)
	77	{
	78	if (!arg)
	79	return -EINVAL;
	80
e621bd18 DY	81	/* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/
e621bd18 DY	82	__VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET;
bef1568d YL	83	return 0;
	84	}
	85	early_param("vmalloc", parse_vmalloc);
	86
	87	/*
	88	* reservetop=size reserves a hole at the top of the kernel address space which
	89	* a hypervisor can load into later. Needed for dynamically loaded hypervisors,
	90	* so relocating the fixmap can be done before paging initialization.
	91	*/
	92	static int __init parse_reservetop(char *arg)
	93	{
	94	unsigned long address;
	95
	96	if (!arg)
	97	return -EINVAL;
	98
	99	address = memparse(arg, &arg);
	100	reserve_top_address(address);
5b7c73e0	101	early_ioremap_init();
bef1568d YL	102	return 0;
	103	}
	104	early_param("reservetop", parse_reservetop);