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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - arch/x86/mm/pgtable_32.c
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/slab.h>
10 #include <linux/pagemap.h>
11 #include <linux/spinlock.h>
12 #include <linux/module.h>
13 #include <linux/quicklist.h>
15 #include <asm/system.h>
16 #include <asm/pgtable.h>
17 #include <asm/pgalloc.h>
18 #include <asm/fixmap.h>
21 #include <asm/tlbflush.h>
23 unsigned int __VMALLOC_RESERVE
= 128 << 20;
26 * Associate a virtual page frame with a given physical page frame
27 * and protection flags for that frame.
29 void set_pte_vaddr(unsigned long vaddr
, pte_t pteval
)
36 pgd
= swapper_pg_dir
+ pgd_index(vaddr
);
41 pud
= pud_offset(pgd
, vaddr
);
46 pmd
= pmd_offset(pud
, vaddr
);
51 pte
= pte_offset_kernel(pmd
, vaddr
);
53 set_pte_present(&init_mm
, vaddr
, pte
, pteval
);
55 pte_clear(&init_mm
, vaddr
, pte
);
58 * It's enough to flush this one mapping.
59 * (PGE mappings get flushed as well)
61 __flush_tlb_one(vaddr
);
65 * Associate a large virtual page frame with a given physical page frame
66 * and protection flags for that frame. pfn is for the base of the page,
67 * vaddr is what the page gets mapped to - both must be properly aligned.
68 * The pmd must already be instantiated. Assumes PAE mode.
70 void set_pmd_pfn(unsigned long vaddr
, unsigned long pfn
, pgprot_t flags
)
76 if (vaddr
& (PMD_SIZE
-1)) { /* vaddr is misaligned */
77 printk(KERN_WARNING
"set_pmd_pfn: vaddr misaligned\n");
80 if (pfn
& (PTRS_PER_PTE
-1)) { /* pfn is misaligned */
81 printk(KERN_WARNING
"set_pmd_pfn: pfn misaligned\n");
84 pgd
= swapper_pg_dir
+ pgd_index(vaddr
);
86 printk(KERN_WARNING
"set_pmd_pfn: pgd_none\n");
89 pud
= pud_offset(pgd
, vaddr
);
90 pmd
= pmd_offset(pud
, vaddr
);
91 set_pmd(pmd
, pfn_pmd(pfn
, flags
));
93 * It's enough to flush this one mapping.
94 * (PGE mappings get flushed as well)
96 __flush_tlb_one(vaddr
);
99 unsigned long __FIXADDR_TOP
= 0xfffff000;
100 EXPORT_SYMBOL(__FIXADDR_TOP
);
103 * vmalloc=size forces the vmalloc area to be exactly 'size'
104 * bytes. This can be used to increase (or decrease) the
105 * vmalloc area - the default is 128m.
107 static int __init
parse_vmalloc(char *arg
)
112 /* Add VMALLOC_OFFSET to the parsed value due to vm area guard hole*/
113 __VMALLOC_RESERVE
= memparse(arg
, &arg
) + VMALLOC_OFFSET
;
116 early_param("vmalloc", parse_vmalloc
);
119 * reservetop=size reserves a hole at the top of the kernel address space which
120 * a hypervisor can load into later. Needed for dynamically loaded hypervisors,
121 * so relocating the fixmap can be done before paging initialization.
123 static int __init
parse_reservetop(char *arg
)
125 unsigned long address
;
130 address
= memparse(arg
, &arg
);
131 reserve_top_address(address
);
134 early_param("reservetop", parse_reservetop
);