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#include "seg.h"
#include "mem.h"
struct segment_map *seg_map(struct segment* seg, struct page_directory *pagedir, size_t offset) {
struct segment_map *sm = seg->map(seg, pagedir, offset);
if (sm == 0) return 0;
seg->mappings++;
sm->seg = seg;
sm->pagedir = pagedir;
sm->next = pagedir->mappedSegs;
pagedir->mappedSegs = sm;
return sm;
}
void seg_unmap(struct segment_map *map) {
map->seg->unmap(map);
if (map->pagedir->mappedSegs == map) {
map->pagedir->mappedSegs = map->pagedir->mappedSegs->next;
} else {
struct segment_map *m = map->pagedir->mappedSegs;
while (m->next != 0 && m->next != map) m = m->next;
if (m->next == map) m->next = map->next;
}
map->seg->mappings--;
if (map->seg->mappings == 0) {
map->seg->delete(map->seg);
kfree(map->seg->seg_data);
kfree(map->seg);
}
kfree (map);
}
// ************************************ SIMPLESEG stuff *************
struct segment* simpleseg_make(size_t start, size_t len, int writable) {
struct simpleseg *ss = kmalloc(sizeof(struct simpleseg));
struct segment *se = kmalloc(sizeof(struct segment));
se->seg_data = ss;
se->mappings = 0;
se->map = simpleseg_map;
se->unmap = simpleseg_unmap;
se->delete = simpleseg_delete;
se->handle_fault = simpleseg_handleFault;
ss->writable = writable; ss->start = start; ss->len = len;
return se;
}
struct segment_map* simpleseg_map(struct segment* seg, struct page_directory* pagedir, size_t offset) {
struct segment_map *sm = kmalloc(sizeof(struct segment_map));
sm->start = ((struct simpleseg*)(seg->seg_data))->start;
sm->len = ((struct simpleseg*)(seg->seg_data))->len;
return sm;
}
void simpleseg_unmap(struct segment_map* sm) {
size_t i;
for (i = sm->start; i < sm->start + sm->len; i += 0x1000) {
page_unmapFree(pagedir_getPage(sm->pagedir, i, 0));
}
}
int simpleseg_handleFault(struct segment_map* sm, size_t addr, int write) {
struct simpleseg *ss = sm->seg->seg_data;
if (write && !ss->writable) return 1;
addr &= 0xFFFFF000;
struct page *p = pagedir_getPage(sm->pagedir, addr, 1);
if (p->frame != 0) return 1;
page_map(p, frame_alloc(), 1, ss->writable);
return 0;
}
void simpleseg_delete(struct segment* seg) {
}
int simpleseg_resize(struct segment_map *map, size_t len) {
size_t i;
if (map == 0) return -1;
if (map->seg->delete != simpleseg_delete) return -2;
struct simpleseg *s = (struct simpleseg*)map->seg->seg_data;
if (len & 0xFFF) len = (len & 0xFFFFF000) + 0x1000;
if (len < map->len) {
for (i = map->start + len; i < map->start + map->len; i += 0x1000) {
page_unmapFree(pagedir_getPage(map->pagedir, i, 0));
}
map->len = len;
s->len = len;
} else if (len > map->len) {
map->len = len;
s->len = len;
}
return 0;
}
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