tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include <linux/vmalloc.h>
2#include <asm/pgalloc.h>
3#include <asm/cacheflush.h>
4
5static inline void
6remap_area_pte(pte_t * pte, unsigned long address, unsigned long size,
7 unsigned long phys_addr, unsigned long flags)
8{
9 unsigned long end;
10 unsigned long pfn;
11
12 address &= ~PMD_MASK;
13 end = address + size;
14 if (end > PMD_SIZE)
15 end = PMD_SIZE;
16 if (address >= end)
17 BUG();
18 pfn = phys_addr >> PAGE_SHIFT;
19 do {
20 if (!pte_none(*pte)) {
21 printk("remap_area_pte: page already exists\n");
22 BUG();
23 }
24 set_pte(pte, pfn_pte(pfn,
25 __pgprot(_PAGE_VALID | _PAGE_ASM |
26 _PAGE_KRE | _PAGE_KWE | flags)));
27 address += PAGE_SIZE;
28 pfn++;
29 pte++;
30 } while (address && (address < end));
31}
32
33static inline int
34remap_area_pmd(pmd_t * pmd, unsigned long address, unsigned long size,
35 unsigned long phys_addr, unsigned long flags)
36{
37 unsigned long end;
38
39 address &= ~PGDIR_MASK;
40 end = address + size;
41 if (end > PGDIR_SIZE)
42 end = PGDIR_SIZE;
43 phys_addr -= address;
44 if (address >= end)
45 BUG();
46 do {
47 pte_t * pte = pte_alloc_kernel(pmd, address);
48 if (!pte)
49 return -ENOMEM;
50 remap_area_pte(pte, address, end - address,
51 address + phys_addr, flags);
52 address = (address + PMD_SIZE) & PMD_MASK;
53 pmd++;
54 } while (address && (address < end));
55 return 0;
56}
57
58int
59__alpha_remap_area_pages(unsigned long address, unsigned long phys_addr,
60 unsigned long size, unsigned long flags)
61{
62 pgd_t * dir;
63 int error = 0;
64 unsigned long end = address + size;
65
66 phys_addr -= address;
67 dir = pgd_offset(&init_mm, address);
68 flush_cache_all();
69 if (address >= end)
70 BUG();
71 do {
72 pmd_t *pmd;
73 pmd = pmd_alloc(&init_mm, dir, address);
74 error = -ENOMEM;
75 if (!pmd)
76 break;
77 if (remap_area_pmd(pmd, address, end - address,
78 phys_addr + address, flags))
79 break;
80 error = 0;
81 address = (address + PGDIR_SIZE) & PGDIR_MASK;
82 dir++;
83 } while (address && (address < end));
84 return error;
85}
86