1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
#include <apos/mem_regions.h>
#include <apos/bits.h>
#include <apos/vmem.h>
#include <arch/vmem.h>
stat_t init_uvmem(struct tcb *t, vm_t base, vm_t top)
{
return init_region(&t->sp_r, base, top);
}
vm_t alloc_uvmem(struct tcb *t, size_t size, vmflags_t flags)
{
vm_t v = alloc_region(&t->sp_r, size, &size, flags);
return map_allocd_region(t->b_r, v, size, flags);
}
vm_t alloc_fixed_uvmem(struct tcb *t, vm_t start, size_t size, vmflags_t flags)
{
vm_t v = alloc_fixed_region(&t->sp_r, start, size, &size, flags);
return map_allocd_region(t->b_r, v, size, flags);
}
/* free_shared_uvmem shouldn't be needed, likely to work with free_uvmem */
vm_t alloc_shared_uvmem(struct tcb *t, size_t size, vmflags_t flags)
{
/* TODO: proper error handling */
vm_t v = alloc_region(&t->sp_r, size, &size,
flags | MR_SHARED | MR_OWNED);
return map_shared_region(t->b_r, v, size, flags);
}
vm_t ref_shared_uvmem(struct tcb *t1, struct tcb *t2, vm_t va, vmflags_t flags)
{
struct mem_region *m = find_used_region(&t1->sp_r, va);
if (!m)
return 0;
if (!__is_set(m->flags, MR_OWNED))
return 0;
/* loop over all pages in this region */
size_t size = m->end - m->start;
size_t pages = __pages(size);
vm_t v = alloc_region(&t2->sp_r, size, &size, flags | MR_SHARED);
/* a for each page could be cool? */
vm_t runner = v;
for (; pages; --pages) {
pm_t paddr;
stat_vpage(t1->b_r, v, &paddr, 0, 0);
map_vpage(t2->b_r, paddr, runner, flags, MM_O0);
runner += __o_size(MM_O0);
}
return v;
}
stat_t free_uvmem(struct tcb *t, vm_t va)
{
struct mem_region *m = find_used_region(&t->sp_r, va);
if (!m)
return -1;
pm_t pa = __addr(m->end - m->start);
vmflags_t flags = m->flags;
free_region(&t->sp_r, va);
unmap_freed_region(t->b_r, va, pa, flags);
return 0;
}
stat_t alloc_uvmem_wrapper(struct vm_branch *b, pm_t *offset, vm_t vaddr,
vmflags_t flags, enum mm_order order)
{
*offset = alloc_page(order, *offset);
if (!*offset)
return REGION_TRY_AGAIN; /* try again */
map_vpage(b, *offset, vaddr, flags, order);
return OK;
}
stat_t alloc_shared_wrapper(struct vm_branch *b, pm_t *offset, vm_t vaddr,
vmflags_t flags, enum mm_order order)
{
if (order != MM_O0)
return REGION_TRY_AGAIN;
*offset = alloc_page(MM_O0, *offset);
map_vpage(b, *offset, vaddr, flags, order);
return OK;
}
stat_t free_uvmem_wrapper(struct vm_branch *b, pm_t *offset, vm_t vaddr,
vmflags_t flags, enum mm_order order)
{
UNUSED(flags);
UNUSED(offset);
pm_t paddr = 0;
enum mm_order v_order = 0;
stat_vpage(b, vaddr, &paddr, &v_order, 0);
if (order != v_order)
return REGION_TRY_AGAIN;
unmap_vpage(b, vaddr);
/* don't free shared pages, unless they're owned */
if (!__is_set(flags, MR_SHARED) || __is_set(flags, MR_OWNED))
free_page(order, paddr);
return OK;
}
|
