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introduction of mckernel_procfs_file_operations; fix /proc/self path resolution;

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implementation of /proc/self/pagemap (LTP mmap12)
This commit is contained in:
bgerofi@riken.jp
2014-12-15 12:43:42 +09:00
committed by Balazs Gerofi bgerofi@riken.jp
parent 815d907ca4
commit d4ba4dc8b3
7 changed files with 185 additions and 24 deletions
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19
arch/x86/kernel/include/arch-memory.h
View File

@ -117,6 +117,25 @@
#define PTE_NULL ((pte_t)0)
typedef unsigned long pte_t;
/*
* pagemap kernel ABI bits
*/
#define PM_ENTRY_BYTES sizeof(uint64_t)
#define PM_STATUS_BITS 3
#define PM_STATUS_OFFSET (64 - PM_STATUS_BITS)
#define PM_STATUS_MASK (((1LL << PM_STATUS_BITS) - 1) << PM_STATUS_OFFSET)
#define PM_STATUS(nr) (((nr) << PM_STATUS_OFFSET) & PM_STATUS_MASK)
#define PM_PSHIFT_BITS 6
#define PM_PSHIFT_OFFSET (PM_STATUS_OFFSET - PM_PSHIFT_BITS)
#define PM_PSHIFT_MASK (((1LL << PM_PSHIFT_BITS) - 1) << PM_PSHIFT_OFFSET)
#define PM_PSHIFT(x) (((uint64_t) (x) << PM_PSHIFT_OFFSET) & PM_PSHIFT_MASK)
#define PM_PFRAME_MASK ((1LL << PM_PSHIFT_OFFSET) - 1)
#define PM_PFRAME(x) ((x) & PM_PFRAME_MASK)
#define PM_PRESENT PM_STATUS(4LL)
#define PM_SWAP PM_STATUS(2LL)
/* For easy conversion, it is better to be the same as architecture's ones */
enum ihk_mc_pt_attribute {
PTATTR_ACTIVE = 0x01,

44
arch/x86/kernel/memory.c
View File

@ -494,6 +494,50 @@ static int __clear_pt_page(struct page_table *pt, void *virt, int largepage)
return 0;
}
uint64_t ihk_mc_pt_virt_to_pagemap(struct page_table *pt, unsigned long virt)
{
int l4idx, l3idx, l2idx, l1idx;
unsigned long v = (unsigned long)virt;
uint64_t ret = 0;
if (!pt) {
pt = init_pt;
}
GET_VIRT_INDICES(v, l4idx, l3idx, l2idx, l1idx);
if (!(pt->entry[l4idx] & PFL4_PRESENT)) {
return ret;
}
pt = phys_to_virt(pt->entry[l4idx] & PAGE_MASK);
if (!(pt->entry[l3idx] & PFL3_PRESENT)) {
return ret;
}
pt = phys_to_virt(pt->entry[l3idx] & PAGE_MASK);
if (!(pt->entry[l2idx] & PFL2_PRESENT)) {
return ret;
}
if ((pt->entry[l2idx] & PFL2_SIZE)) {
ret = PM_PFRAME(((pt->entry[l2idx] & LARGE_PAGE_MASK) +
(v & (LARGE_PAGE_SIZE - 1))) >> PAGE_SHIFT);
ret |= PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT;
return ret;
}
pt = phys_to_virt(pt->entry[l2idx] & PAGE_MASK);
if (!(pt->entry[l1idx] & PFL1_PRESENT)) {
return ret;
}
ret = PM_PFRAME((pt->entry[l1idx] & PT_PHYSMASK) >> PAGE_SHIFT);
ret |= PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT;
return ret;
}
int ihk_mc_pt_virt_to_phys(struct page_table *pt,
void *virt, unsigned long *phys)
{