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Kernel: Make BochsVGADevice a BlockDevice and support mmapping it.

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Currently you can only mmap the entire framebuffer.
Using this when starting up the WindowServer gets us yet another step
closer towards it moving into userspace. :^)
This commit is contained in:
Andreas Kling
2019-02-16 09:57:42 +01:00
parent 2dc7c5a7b0
commit 799177feda
15 changed files with 155 additions and 26 deletions
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14
Kernel/Process.cpp
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@@ -182,12 +182,7 @@ void* Process::sys$mmap(const Syscall::SC_mmap_params* params)
return (void*)-EBADF;
if (!descriptor->supports_mmap())
return (void*)-ENODEV;
// FIXME: If PROT_EXEC, check that the underlying file system isn't mounted noexec.
auto region_name = descriptor->absolute_path();
InterruptDisabler disabler;
// FIXME: Implement mapping at a client-specified address. Most of the support is already in plcae.
ASSERT(addr == nullptr);
auto* region = allocate_file_backed_region(LinearAddress(), size, descriptor->inode(), move(region_name), prot & PROT_READ, prot & PROT_WRITE);
auto* region = descriptor->mmap(*this, LinearAddress((dword)addr), offset, size, prot);
if (!region)
return (void*)-ENOMEM;
return region->laddr().as_ptr();
@@ -2240,13 +2235,6 @@ DisplayInfo Process::set_video_resolution(int width, int height)
info.height = height;
info.bpp = 32;
info.pitch = width * 4;
size_t framebuffer_size = width * height * 4 * 2;
if (!m_display_framebuffer_region) {
auto framebuffer_vmo = VMObject::create_framebuffer_wrapper(BochsVGADevice::the().framebuffer_address(), framebuffer_size);
m_display_framebuffer_region = allocate_region_with_vmo(LinearAddress(0xe0000000), framebuffer_size, move(framebuffer_vmo), 0, "framebuffer", true, true);
}
info.framebuffer = m_display_framebuffer_region->laddr().as_ptr();
BochsVGADevice::the().set_resolution(width, height);
return info;
}