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Finish address_manager to vm_space transition

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This commit is contained in:
Justin C. Miller
2019-05-18 18:06:57 -07:00
parent 2d54eb5143
commit ce035d2a43
8 changed files with 75 additions and 104 deletions
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71
src/kernel/page_manager.cpp
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@@ -1,21 +1,21 @@
#include <algorithm>
#include "kutil/assert.h"
#include "kutil/vm_space.h"
#include "console.h"
#include "io.h"
#include "log.h"
#include "page_manager.h"
using memory::frame_size;
using memory::heap_start;
using memory::kernel_max_heap;
using memory::kernel_offset;
using memory::page_offset;
using memory::page_mappable;
extern kutil::address_manager g_kernel_address_manager;
page_manager g_page_manager(
g_frame_allocator,
g_kernel_address_manager);
page_manager g_page_manager(g_frame_allocator);
extern kutil::vm_space g_kspace;
static uintptr_t
pt_to_phys(page_table *pt)
@@ -38,12 +38,10 @@ struct free_page_header
};
page_manager::page_manager(
frame_allocator &frames,
kutil::address_manager &addrs) :
page_manager::page_manager(frame_allocator &frames) :
m_page_cache(nullptr),
m_frames(frames),
m_addrs(addrs)
m_memory_initialized(false)
{
}
@@ -72,52 +70,18 @@ page_manager::copy_page(uintptr_t orig)
bool paged_orig = false;
bool paged_copy = false;
uintptr_t orig_virt;
if (page_mappable(orig)) {
orig_virt = orig + page_offset;
} else {
orig_virt = m_addrs.allocate(frame_size);
page_in(get_pml4(), orig, orig_virt, 1);
paged_orig = true;
}
uintptr_t copy = 0;
uintptr_t copy_virt;
size_t n = m_frames.allocate(1, &copy);
kassert(n, "copy_page could not allocate page");
if (page_mappable(copy)) {
copy_virt = copy + page_offset;
} else {
copy_virt = m_addrs.allocate(frame_size);
page_in(get_pml4(), copy, copy_virt, 1);
paged_copy = true;
}
// TODO: multiple page copies at a time, so that we don't have to keep
// paying this mapping penalty
if (paged_orig || paged_copy) {
set_pml4(get_pml4());
__sync_synchronize();
io_wait();
}
uintptr_t orig_virt = orig + page_offset;
uintptr_t copy_virt = copy + page_offset;
kutil::memcpy(
reinterpret_cast<void *>(copy_virt),
reinterpret_cast<void *>(orig_virt),
frame_size);
if (paged_orig) {
page_out(get_pml4(), orig_virt, 1);
m_addrs.free(orig_virt);
}
if (paged_copy) {
page_out(get_pml4(), copy_virt, 1);
m_addrs.free(copy_virt);
}
return copy;
}
@@ -246,10 +210,7 @@ page_manager::free_table_pages(void *pages, size_t count)
void *
page_manager::map_pages(uintptr_t address, size_t count, bool user, page_table *pml4)
{
if (!address) {
kassert(!user, "Cannot call map_pages with 0 address for user mapping");
address = m_addrs.allocate(count * frame_size);
}
kassert(address, "Cannot call map_pages with 0 address");
void *ret = reinterpret_cast<void *>(address);
if (!pml4) pml4 = get_pml4();
@@ -346,19 +307,21 @@ page_manager::unmap_pages(void* address, size_t count, page_table *pml4)
uintptr_t iaddr = reinterpret_cast<uintptr_t>(address);
page_out(pml4, iaddr, count, true);
if (iaddr >= kernel_offset) {
// TODO
// m_addrs.free(address, count);
}
}
bool
page_manager::fault_handler(uintptr_t addr)
{
if (!m_addrs.contains(addr))
if (!addr)
return false;
if (m_memory_initialized &&
g_kspace.get(addr) != kutil::vm_state::committed)
return false;
uintptr_t page = addr & ~0xfffull;
log::debug(logs::memory, "PF: attempting to page in %016lx for %016lx", page, addr);
bool user = addr < kernel_offset;
map_pages(page, 1, user);