1 #include <linux/sched.h>
2 #include <linux/kernel.h>
3 #include <linux/errno.h>
6 #include <linux/swap.h>
8 #include <linux/highmem.h>
9 #include <linux/pagemap.h>
10 #include <linux/spinlock.h>
12 #include <asm/pgtable.h>
13 #include <asm/pgalloc.h>
14 #include <asm/fixmap.h>
17 #include <asm/tlbflush.h>
20 unsigned int __VMALLOC_RESERVE = 128 << 20;
23 * Associate a virtual page frame with a given physical page frame
24 * and protection flags for that frame.
26 void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
33 pgd = swapper_pg_dir + pgd_index(vaddr);
38 pud = pud_offset(pgd, vaddr);
43 pmd = pmd_offset(pud, vaddr);
48 pte = pte_offset_kernel(pmd, vaddr);
49 if (!pte_none(pteval))
50 set_pte_at(&init_mm, vaddr, pte, pteval);
52 pte_clear(&init_mm, vaddr, pte);
55 * It's enough to flush this one mapping.
56 * (PGE mappings get flushed as well)
58 __flush_tlb_one(vaddr);
61 unsigned long __FIXADDR_TOP = 0xfffff000;
62 EXPORT_SYMBOL(__FIXADDR_TOP);
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.
69 static int __init parse_vmalloc(char *arg)
74 /* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/
75 __VMALLOC_RESERVE = memparse(arg, &arg) + VMALLOC_OFFSET;
78 early_param("vmalloc", parse_vmalloc);
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.
85 static int __init parse_reservetop(char *arg)
87 unsigned long address;
92 address = memparse(arg, &arg);
93 reserve_top_address(address);
97 early_param("reservetop", parse_reservetop);