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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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38
Kernel/BochsVGADevice.cpp
View file

@ -1,6 +1,8 @@
#include <Kernel/BochsVGADevice.h>
#include <Kernel/IO.h>
#include <Kernel/PCI.h>
#include <Kernel/MemoryManager.h>
#include <Kernel/Process.h>
#define VBE_DISPI_IOPORT_INDEX 0x01CE
#define VBE_DISPI_IOPORT_DATA 0x01CF
@ -27,11 +29,25 @@ BochsVGADevice& BochsVGADevice::the()
}
BochsVGADevice::BochsVGADevice()
: BlockDevice(82, 413)
{
s_the = this;
m_framebuffer_address = PhysicalAddress(find_framebuffer_address());
}
Region* BochsVGADevice::mmap(Process& process, LinearAddress preferred_laddr, size_t offset, size_t size)
{
ASSERT(offset == 0);
ASSERT(size == framebuffer_size_in_bytes());
auto framebuffer_vmo = VMObject::create_framebuffer_wrapper(framebuffer_address(), framebuffer_size_in_bytes());
auto* region = process.allocate_region_with_vmo(preferred_laddr, framebuffer_size_in_bytes(), move(framebuffer_vmo), 0, "BochsVGADevice Framebuffer", true, true);
kprintf("BochsVGADevice::mmap for %s(%u) mapped region %p for fb addr %p\n",
process.name().characters(), process.pid(),
region, framebuffer_address());
ASSERT(region);
return region;
}
void BochsVGADevice::set_register(word index, word data)
{
IO::out16(VBE_DISPI_IOPORT_INDEX, index);
@ -48,6 +64,8 @@ void BochsVGADevice::set_resolution(int width, int height)
set_register(VBE_DISPI_INDEX_BPP, 32);
set_register(VBE_DISPI_INDEX_ENABLE, VBE_DISPI_ENABLED | VBE_DISPI_LFB_ENABLED);
set_register(VBE_DISPI_INDEX_BANK, 0);
m_framebuffer_size = { width, height };
}
void BochsVGADevice::set_y_offset(int offset)
@ -68,3 +86,23 @@ dword BochsVGADevice::find_framebuffer_address()
});
return framebuffer_address;
}
bool BochsVGADevice::can_read(Process&) const
{
ASSERT_NOT_REACHED();
}
bool BochsVGADevice::can_write(Process&) const
{
ASSERT_NOT_REACHED();
}
ssize_t BochsVGADevice::read(Process&, byte*, size_t)
{
ASSERT_NOT_REACHED();
}
ssize_t BochsVGADevice::write(Process&, const byte*, size_t)
{
ASSERT_NOT_REACHED();
}