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Rearrange AHCI code, attempt to read WIP

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This commit is contained in:
Justin C. Miller
2018-05-11 01:24:59 -07:00
parent 8ae3eea19c
commit d06dd2ef43
15 changed files with 774 additions and 243 deletions
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64
src/kernel/page_manager.cpp
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@@ -353,6 +353,9 @@ page_manager::map_pages(addr_t address, size_t count)
block->physical_address = phys;
block->virtual_address = address;
block->count = n;
block->flags =
page_block_flags::used |
page_block_flags::mapped;
page_block::insert(m_used, block);
page_in(pml4, phys, address, n);
@@ -364,12 +367,59 @@ page_manager::map_pages(addr_t address, size_t count)
return ret;
}
void
page_manager::unmap_pages(addr_t address, size_t count)
void *
page_manager::map_offset_pages(size_t count)
{
page_table *pml4 = get_pml4();
page_block *free = m_free;
page_block *prev = nullptr;
log::debug(logs::memory, "Got request to offset map %d pages", count);
while (free) {
if (free->count < count) {
prev = free;
free = free->next;
continue;
}
page_block *used = get_block();
used->count = count;
used->physical_address = free->physical_address;
used->virtual_address = used->physical_address + page_offset;
used->flags =
page_block_flags::used |
page_block_flags::mapped;
page_block::insert(m_used, used);
free->physical_address += count * page_size;
free->count -= count;
if (free->count == 0) {
if (prev)
prev->next = free->next;
else
m_free = free->next;
free->zero(m_block_cache);
m_block_cache = free;
}
page_in(pml4, used->physical_address, used->virtual_address, count);
return reinterpret_cast<void *>(used->virtual_address);
}
return nullptr;
}
void
page_manager::unmap_pages(void* address, size_t count)
{
addr_t addr = reinterpret_cast<addr_t>(address);
page_block **prev = &m_used;
page_block *cur = m_used;
while (cur && !cur->contains(address)) {
while (cur && !cur->contains(addr)) {
prev = &cur->next;
cur = cur->next;
}
@@ -377,10 +427,10 @@ page_manager::unmap_pages(addr_t address, size_t count)
kassert(cur, "Couldn't find existing mapped pages to unmap");
size_t size = page_size * count;
addr_t end = address + size;
addr_t end = addr + size;
while (cur && cur->contains(address)) {
size_t leading = address - cur->virtual_address;
while (cur && cur->contains(addr)) {
size_t leading = addr - cur->virtual_address;
size_t trailing =
end > cur->virtual_end() ?
0 : (cur->virtual_end() - end);
@@ -416,7 +466,7 @@ page_manager::unmap_pages(addr_t address, size_t count)
cur->next = trail_block;
}
address += cur->count * page_size;
addr += cur->count * page_size;
page_block *next = cur->next;
*prev = cur->next;