forked from Minki/linux
135 lines
3.2 KiB
C
135 lines
3.2 KiB
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_present(&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);
|