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implement mmap(MAP_POPULATE)

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populate_process_memory() function is not efficient,
because whether every small page is present is checked.
This commit is contained in:
NAKAMURA Gou
2014-01-24 21:27:18 +09:00
parent bdc945cb34
commit f0a52d4519
5 changed files with 93 additions and 1 deletions
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6
arch/x86/kernel/include/arch-memory.h
View File

@ -62,6 +62,7 @@
#define PT_PHYSMASK (((1UL << 52) - 1) & PAGE_MASK)
#define PF_PRESENT ((pte_t)0x01) /* entry is valid */
#define PF_WRITABLE ((pte_t)0x02)
#define PF_SIZE ((pte_t)0x80) /* entry points large page */
#define PFL4_PRESENT ((pte_t)0x01)
@ -130,6 +131,11 @@ static inline int pte_is_present(pte_t *ptep)
return !!(*ptep & PF_PRESENT);
}
static inline int pte_is_writable(pte_t *ptep)
{
return !!(*ptep & PF_WRITABLE);
}
static inline uintptr_t pte_get_phys(pte_t *ptep)
{
return (*ptep & PT_PHYSMASK);

5
arch/x86/kernel/include/registers.h
View File

@ -151,6 +151,9 @@ struct x86_regs {
* bit 2 == 0: kernel-mode access 1: user-mode access
* bit 3 == 1: use of reserved bit detected
* bit 4 == 1: fault was an instruction fetch
*
* internal use:
* bit 30 == 1: don't use COW page to resolve page fault.
*/
enum x86_pf_error_code {
PF_PROT = 1 << 0,
@ -158,6 +161,8 @@ enum x86_pf_error_code {
PF_USER = 1 << 2,
PF_RSVD = 1 << 3,
PF_INSTR = 1 << 4,
PF_DONTCOW = 1 << 30,
};
#endif