[linux-2.6-block.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/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_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
1da177e4 LT	12	#include <asm/pgtable.h>
	13	#include <asm/pgalloc.h>
	14	#include <asm/fixmap.h>
	15	#include <asm/e820.h>
	16	#include <asm/tlb.h>
	17	#include <asm/tlbflush.h>
56f0e74c	18	#include <asm/io.h>
1da177e4	19
2b688dfd PE	20	unsigned int __VMALLOC_RESERVE = 128 << 20;
2b688dfd PE	21
1da177e4 LT	22	/*
	23	* Associate a virtual page frame with a given physical page frame
	24	* and protection flags for that frame.
	25	*/
d494a961	26	void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
1da177e4 LT	27	{
	28	pgd_t *pgd;
	29	pud_t *pud;
	30	pmd_t *pmd;
	31	pte_t *pte;
	32
	33	pgd = swapper_pg_dir + pgd_index(vaddr);
	34	if (pgd_none(*pgd)) {
	35	BUG();
	36	return;
	37	}
	38	pud = pud_offset(pgd, vaddr);
	39	if (pud_none(*pud)) {
	40	BUG();
	41	return;
	42	}
	43	pmd = pmd_offset(pud, vaddr);
	44	if (pmd_none(*pmd)) {
	45	BUG();
	46	return;
	47	}
	48	pte = pte_offset_kernel(pmd, vaddr);
dcb32d99	49	if (!pte_none(pteval))
b40c7579	50	set_pte_at(&init_mm, vaddr, pte, pteval);
b0bfece4 JB	51	else
b0bfece4 JB	52	pte_clear(&init_mm, vaddr, pte);
1da177e4 LT	53
	54	/*
	55	* It's enough to flush this one mapping.
	56	* (PGE mappings get flushed as well)
1da177e4 LT	57	*/
	58	__flush_tlb_one(vaddr);
	59	}
	60
052e7994 JF	61	unsigned long __FIXADDR_TOP = 0xfffff000;
052e7994 JF	62	EXPORT_SYMBOL(__FIXADDR_TOP);
052e7994	63
bef1568d YL	64	/*
	65	* vmalloc=size forces the vmalloc area to be exactly 'size'
	66	* bytes. This can be used to increase (or decrease) the
	67	* vmalloc area - the default is 128m.
	68	*/
	69	static int __init parse_vmalloc(char *arg)
	70	{
	71	if (!arg)
	72	return -EINVAL;
	73
e621bd18 DY	74	/* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/
e621bd18 DY	75	__VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET;
bef1568d YL	76	return 0;
	77	}
	78	early_param("vmalloc", parse_vmalloc);
	79
	80	/*
	81	* reservetop=size reserves a hole at the top of the kernel address space which
	82	* a hypervisor can load into later. Needed for dynamically loaded hypervisors,
	83	* so relocating the fixmap can be done before paging initialization.
	84	*/
	85	static int __init parse_reservetop(char *arg)
	86	{
	87	unsigned long address;
	88
	89	if (!arg)
	90	return -EINVAL;
	91
	92	address = memparse(arg, &arg);
	93	reserve_top_address(address);
5b7c73e0	94	early_ioremap_init();
bef1568d YL	95	return 0;
	96	}
	97	early_param("reservetop", parse_reservetop);