RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-05-31 18:18:12 +00:00
Code Issues Activity Actions

Add basic zero faults.

Browse source 
mmap() will now map uncommitted pages that get allocated and zeroed upon the
first access. I also made /proc/PID/vm show number of "committed" bytes in
each region. This is so cool! :^)
This commit is contained in:
Andreas Kling 2018-11-19 02:17:20 +01:00
parent e88f306d07
commit 629c5be10b
5 changed files with 42 additions and 7 deletions
Download patch file Download diff file Expand all files Collapse all files

7
Kernel/Process.cpp
View file

@ -65,7 +65,7 @@ Vector<Process*> Process::allProcesses()
return processes;
}
Region* Process::allocate_region(LinearAddress laddr, size_t size, String&& name, bool is_readable, bool is_writable)
Region* Process::allocate_region(LinearAddress laddr, size_t size, String&& name, bool is_readable, bool is_writable, bool commit)
{
// FIXME: This needs sanity checks. What if this overlaps existing regions?
if (laddr.is_null()) {
@ -74,7 +74,8 @@ Region* Process::allocate_region(LinearAddress laddr, size_t size, String&& name
}
laddr.mask(0xfffff000);
m_regions.append(adopt(*new Region(laddr, size, move(name), is_readable, is_writable)));
m_regions.last()->commit(*this);
if (commit)
m_regions.last()->commit(*this);
MM.mapRegion(*this, *m_regions.last());
return m_regions.last().ptr();
}
@ -161,7 +162,7 @@ void* Process::sys$mmap(const Syscall::SC_mmap_params* params)
InterruptDisabler disabler;
// FIXME: Implement mapping at a client-specified address. Most of the support is already in plcae.
ASSERT(addr == nullptr);
auto* region = allocate_region(LinearAddress(), size, "mmap", prot & PROT_READ, prot & PROT_WRITE);
auto* region = allocate_region(LinearAddress(), size, "mmap", prot & PROT_READ, prot & PROT_WRITE, false);
if (!region)
return (void*)-ENOMEM;
return region->linearAddress.asPtr();