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support msync() system call. refs #382

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Msync(2) of this version writes only the pages which the calling process
modified. Modifications of the other processes are not written.
This commit is contained in:
NAKAMURA Gou
2014-07-09 14:19:26 +09:00
parent 6485578a7f
commit 16af976a71
8 changed files with 356 additions and 0 deletions
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36
arch/x86/kernel/include/arch-memory.h
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@ -204,6 +204,12 @@ static inline off_t pte_get_off(pte_t *ptep, size_t pgsize)
return (off_t)(*ptep & PAGE_MASK);
}
static inline void pte_make_null(pte_t *ptep, size_t pgsize)
{
*ptep = PTE_NULL;
return;
}
static inline void pte_make_fileoff(off_t off,
enum ihk_mc_pt_attribute ptattr, size_t pgsize, pte_t *ptep)
{
@ -235,6 +241,36 @@ static inline void pte_xchg(pte_t *ptep, pte_t *valp)
#define pte_xchg(p,vp) do { *(vp) = xchg((p), *(vp)); } while (0)
#endif
static inline void pte_clear_dirty(pte_t *ptep, size_t pgsize)
{
uint64_t mask;
switch (pgsize) {
default: /* through */
case PTL1_SIZE: mask = ~PFL1_DIRTY; break;
case PTL2_SIZE: mask = ~PFL2_DIRTY; break;
case PTL3_SIZE: mask = ~PFL3_DIRTY; break;
}
asm volatile ("lock andq %0,%1" :: "r"(mask), "m"(*ptep));
return;
}
static inline void pte_set_dirty(pte_t *ptep, size_t pgsize)
{
uint64_t mask;
switch (pgsize) {
default: /* through */
case PTL1_SIZE: mask = PFL1_DIRTY; break;
case PTL2_SIZE: mask = PFL2_DIRTY; break;
case PTL3_SIZE: mask = PFL3_DIRTY; break;
}
asm volatile ("lock orq %0,%1" :: "r"(mask), "m"(*ptep));
return;
}
struct page_table;
void set_pte(pte_t *ppte, unsigned long phys, enum ihk_mc_pt_attribute attr);
pte_t *get_pte(struct page_table *pt, void *virt, enum ihk_mc_pt_attribute attr);