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#include <apos/mem_regions.h>
#include <apos/assert.h>
#include <apos/debug.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);
}
static stat_t __free_mapped_region(struct tcb *t, struct mem_region *m)
{
stat_t status = OK;
pm_t pa = __addr(m->end - m->start);
if (unmap_freed_region(t->b_r, m->start, pa, m->flags, &status))
return ERR_MISC;
return status;
}
stat_t destroy_uvmem(struct tcb *t)
{
struct mem_region *m = find_first_region(&t->sp_r);
while (m) {
/* free all memory associated with used regions */
if (is_region_used(m))
__free_mapped_region(t, m);
}
/* destroy region tree itself */
return destroy_region(&t->sp_r);
}
vm_t alloc_uvmem(struct tcb *t, size_t size, vmflags_t flags)
{
/* t exists and is the process tcb of the current process */
hard_assert(t && is_proc(t), ERR_INVAL);
stat_t status = OK;
const vm_t v = alloc_region(&t->sp_r, size, &size, flags);
const vm_t w = map_allocd_region(t->b_r, v, size, flags, &status);
if (status == INFO_SEFF)
clone_tcb_maps(t);
return w;
}
vm_t alloc_fixed_uvmem(struct tcb *t, vm_t start, size_t size, vmflags_t flags)
{
hard_assert(t && is_proc(t), ERR_INVAL);
stat_t status = OK;
const vm_t v = alloc_fixed_region(&t->sp_r, start, size, &size, flags);
const vm_t w = map_allocd_region(t->b_r, v, size, flags, &status);
if (status == INFO_SEFF)
clone_tcb_maps(t);
return w;
}
/* 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)
{
hard_assert(t && is_proc(t), ERR_INVAL);
stat_t status = OK;
const vm_t v = alloc_region(&t->sp_r, size, &size,
flags | MR_SHARED | MR_OWNED);
const vm_t w = map_shared_region(t->b_r, v, size, flags, &status);
if (status == INFO_SEFF)
clone_tcb_maps(t);
return w;
}
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;
}
/* TODO: assume tcb is root tcb? */
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;
free_region(&t->sp_r, va);
stat_t status = __free_mapped_region(t, m);
if (status == INFO_SEFF)
return clone_tcb_maps(t);
return status;
}
stat_t alloc_uvmem_wrapper(struct vmem *b, pm_t *offset, vm_t vaddr,
vmflags_t flags, enum mm_order order, void *data)
{
*offset = alloc_page(order, *offset);
if (!*offset)
return INFO_TRGN; /* try again */
stat_t *status = (stat_t *)data, ret;
ret = map_vpage(b, *offset, vaddr, flags, order);
if (status)
*status = ret;
return (ret == INFO_SEFF) ? OK : ret;
}
stat_t alloc_shared_wrapper(struct vmem *b, pm_t *offset, vm_t vaddr,
vmflags_t flags, enum mm_order order, void *data)
{
if (order != MM_O0)
return INFO_TRGN;
*offset = alloc_page(MM_O0, *offset);
stat_t *status = (stat_t *)data, ret;
ret = map_vpage(b, *offset, vaddr, flags, order);
if (status)
*status = ret;
return (ret == INFO_SEFF) ? OK : ret;
}
stat_t free_uvmem_wrapper(struct vmem *b, pm_t *offset, vm_t vaddr,
vmflags_t flags, enum mm_order order, void *data)
{
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 INFO_TRGN;
stat_t *status = (stat_t *)data, ret;
ret = unmap_vpage(b, vaddr);
if (status)
*status = ret;
/* 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 (ret == INFO_SEFF) ? OK : ret;
}
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