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Kernel: Break region_from_vaddr() into {user,kernel}_region_from_vaddr

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Sometimes you're only interested in either user OR kernel regions but
not both. Let's break this into two functions so the caller can choose
what he's interested in.
This commit is contained in:
Andreas Kling 2019-08-06 10:31:20 +02:00
parent e27e1b3fb2
commit 8d07bce12a
Notes: sideshowbarker 2024-07-19 12:51:34 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/8d07bce12ae
2 changed files with 30 additions and 26 deletions
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53
Kernel/VM/MemoryManager.cpp
View file

@ -255,42 +255,43 @@ void MemoryManager::initialize()
s_the = new MemoryManager;
}
Region* MemoryManager::kernel_region_from_vaddr(VirtualAddress vaddr)
{
ASSERT(vaddr.get() >= 0xc0000000);
for (auto& region : MM.m_kernel_regions) {
if (region->contains(vaddr))
return region;
}
return nullptr;
}
Region* MemoryManager::user_region_from_vaddr(Process& process, VirtualAddress vaddr)
{
// FIXME: Use a binary search tree (maybe red/black?) or some other more appropriate data structure!
for (auto& region : process.m_regions) {
if (region.contains(vaddr))
return &region;
}
dbg() << process << " Couldn't find user region for " << vaddr;
return nullptr;
}
Region* MemoryManager::region_from_vaddr(Process& process, VirtualAddress vaddr)
{
ASSERT_INTERRUPTS_DISABLED();
if (vaddr.get() >= 0xc0000000) {
for (auto& region : MM.m_kernel_regions) {
if (region->contains(vaddr))
return region;
}
}
if (vaddr.get() >= 0xc0000000)
return kernel_region_from_vaddr(vaddr);
// FIXME: Use a binary search tree (maybe red/black?) or some other more appropriate data structure!
for (auto& region : process.m_regions) {
if (region.contains(vaddr))
return &region;
}
dbgprintf("%s(%u) Couldn't find region for L%x (CR3=%x)\n", process.name().characters(), process.pid(), vaddr.get(), process.page_directory().cr3());
return nullptr;
return user_region_from_vaddr(process, vaddr);
}
const Region* MemoryManager::region_from_vaddr(const Process& process, VirtualAddress vaddr)
{
if (vaddr.get() >= 0xc0000000) {
for (auto& region : MM.m_kernel_regions) {
if (region->contains(vaddr))
return region;
}
}
if (vaddr.get() >= 0xc0000000)
return kernel_region_from_vaddr(vaddr);
// FIXME: Use a binary search tree (maybe red/black?) or some other more appropriate data structure!
for (auto& region : process.m_regions) {
if (region.contains(vaddr))
return &region;
}
dbgprintf("%s(%u) Couldn't find region for L%x (CR3=%x)\n", process.name().characters(), process.pid(), vaddr.get(), process.page_directory().cr3());
return nullptr;
return user_region_from_vaddr(const_cast<Process&>(process), vaddr);
}
bool MemoryManager::zero_page(Region& region, unsigned page_index_in_region)

3
Kernel/VM/MemoryManager.h
View file

@ -105,6 +105,9 @@ private:
static Region* region_from_vaddr(Process&, VirtualAddress);
static const Region* region_from_vaddr(const Process&, VirtualAddress);
static Region* user_region_from_vaddr(Process&, VirtualAddress);
static Region* kernel_region_from_vaddr(VirtualAddress);
bool copy_on_write(Region&, unsigned page_index_in_region);
bool page_in_from_inode(Region&, unsigned page_index_in_region);
bool zero_page(Region& region, unsigned page_index_in_region);