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apply demand paging to stack area

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NAKAMURA Gou
2013-10-24 13:44:57 +09:00
parent 78214f3ce4
commit db45e11921
1 changed files with 28 additions and 10 deletions
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38
kernel/process.c
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@@ -1042,27 +1042,45 @@ int init_process_stack(struct process *process, struct program_load_desc *pn,
int s_ind = 0;
int arg_ind;
unsigned long size = USER_STACK_NR_PAGES * PAGE_SIZE;
char *stack = ihk_mc_alloc_pages(USER_STACK_NR_PAGES, IHK_MC_AP_NOWAIT);
unsigned long *p = (unsigned long *)(stack + size);
unsigned long end = process->vm->region.user_end;
unsigned long start = end - size;
int rc;
unsigned long vrflag;
char *stack;
int error;
unsigned long *p;
unsigned long minsz;
if(stack == NULL)
return -ENOMEM;
memset(stack, 0, size);
vrflag = VR_STACK;
/* create stack range */
vrflag = VR_STACK | VR_DEMAND_PAGING;
vrflag |= VR_PROT_READ | VR_PROT_WRITE | VR_PROT_EXEC;
vrflag |= VRFLAG_PROT_TO_MAXPROT(vrflag);
if ((rc = add_process_memory_range(process, start, end, virt_to_phys(stack),
#define NOPHYS ((uintptr_t)-1)
if ((rc = add_process_memory_range(process, start, end, NOPHYS,
vrflag, NULL, 0)) != 0) {
ihk_mc_free_pages(stack, USER_STACK_NR_PAGES);
return rc;
}
/* map physical pages for initial stack frame */
minsz = PAGE_SIZE;
stack = ihk_mc_alloc_pages(minsz >> PAGE_SHIFT, IHK_MC_AP_NOWAIT);
if (!stack) {
return -ENOMEM;
}
memset(stack, 0, minsz);
error = ihk_mc_pt_set_range(process->vm->page_table,
(void *)(end-minsz), (void *)end,
virt_to_phys(stack), vrflag_to_ptattr(vrflag));
if (error) {
kprintf("init_process_stack:"
"set range %lx-%lx %lx failed. %d\n",
(end-minsz), end, stack, error);
ihk_mc_free_pages(stack, minsz >> PAGE_SHIFT);
return error;
}
/* set up initial stack frame */
p = (unsigned long *)(stack + minsz);
s_ind = -1;
p[s_ind--] = 0; /* AT_NULL */
p[s_ind--] = 0;