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Allow vm to split blocks in memory map (needed for multiboot, contributed by Feiran "Fam" Zheng

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This commit is contained in:
Erik van der Kouwe 2010-07-23 14:22:13 +00:00
parent 1c4065cd10
commit d7c70a41e5
1 changed files with 26 additions and 13 deletions
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27
servers/vm/utility.c
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@ -95,22 +95,35 @@ PUBLIC void reserve_proc_mem(mem_chunks, map_ptr)
struct memory *mem_chunks; /* store mem chunks here */ struct memory *mem_chunks; /* store mem chunks here */
struct mem_map *map_ptr; /* memory to remove */ struct mem_map *map_ptr; /* memory to remove */
{ {
/* Remove server memory from the free memory list. The boot monitor /* Remove server memory from the free memory list.
* promises to put processes at the start of memory chunks. The
* tasks all use same base address, so only the first task changes
* the memory lists. The servers and init have their own memory
* spaces and their memory will be removed from the list.
*/ */
struct memory *memp; struct memory *memp;
for (memp = mem_chunks; memp < &mem_chunks[NR_MEMS]; memp++) { for (memp = mem_chunks; memp < &mem_chunks[NR_MEMS]; memp++) {
if(memp->base <= map_ptr[T].mem_phys
&& memp->base+memp->size >= map_ptr[T].mem_phys)
{
if (memp->base == map_ptr[T].mem_phys) { if (memp->base == map_ptr[T].mem_phys) {
memp->base += map_ptr[T].mem_len + map_ptr[S].mem_vir; memp->base += map_ptr[T].mem_len + map_ptr[S].mem_vir;
memp->size -= map_ptr[T].mem_len + map_ptr[S].mem_vir; memp->size -= map_ptr[T].mem_len + map_ptr[S].mem_vir;
} else {
struct memory *mempr;
/* have to split mem_chunks */
if(mem_chunks[NR_MEMS-1].size>0)
panic("reserve_proc_mem: can't find free mem_chunks to map: 0x%lx",
map_ptr[T].mem_phys);
for(mempr=&mem_chunks[NR_MEMS-1];mempr>memp;mempr--) {
*mempr=*(mempr-1);
}
assert(memp < &mem_chunks[NR_MEMS-1]);
(memp+1)->base = map_ptr[T].mem_phys + map_ptr[T].mem_len + map_ptr[S].mem_vir;
(memp+1)->size = memp->base + memp->size
- (map_ptr[T].mem_phys + map_ptr[T].mem_len + map_ptr[S].mem_vir);
memp->size = map_ptr[T].mem_phys - memp->base;
}
break; break;
} }
} }
if (memp >= &mem_chunks[NR_MEMS]) if (memp >= &mem_chunks[NR_MEMS]) {
{
panic("reserve_proc_mem: can't find map in mem_chunks: 0x%lx", panic("reserve_proc_mem: can't find map in mem_chunks: 0x%lx",
map_ptr[T].mem_phys); map_ptr[T].mem_phys);
} }