RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-10-31 14:42:44 +00:00
Code Issues Activity Actions

Kernel/Graphics: Force BGR format when modesetting the bochs-display

Browse source 
By default bochs-display uses the BGR format, but for future-proof
solution, let's force it explicitly to use that format.
This commit is contained in:
Liav A 2021-09-27 08:46:41 +03:00 • committed by Andreas Kling
parent d36e3af7be
commit de1b649783
2 changed files with 35 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

32
Kernel/Graphics/Bochs/GraphicsAdapter.cpp
View file

@ -32,6 +32,8 @@
#define VBE_DISPI_DISABLED 0x00
#define VBE_DISPI_ENABLED 0x01
#define VBE_DISPI_LFB_ENABLED 0x40
#define BOCHS_DISPLAY_LITTLE_ENDIAN 0x1e1e1e1e
#define BOCHS_DISPLAY_BIG_ENDIAN 0xbebebebe
namespace Kernel {
@ -48,11 +50,18 @@ struct [[gnu::packed]] DISPIInterface {
u16 y_offset;
};
struct [[gnu::packed]] ExtensionRegisters {
u32 region_size;
u32 framebuffer_byteorder;
};
struct [[gnu::packed]] BochsDisplayMMIORegisters {
u8 edid_data[0x400];
u16 vga_ioports[0x10];
u8 reserved[0xE0];
DISPIInterface bochs_regs;
u8 reserved2[0x100 - sizeof(DISPIInterface)];
ExtensionRegisters extension_regs;
};
UNMAP_AFTER_INIT NonnullRefPtr<BochsGraphicsAdapter> BochsGraphicsAdapter::initialize(PCI::Address address)
@ -62,6 +71,28 @@ UNMAP_AFTER_INIT NonnullRefPtr<BochsGraphicsAdapter> BochsGraphicsAdapter::initi
return adopt_ref(*new BochsGraphicsAdapter(address));
}
void BochsGraphicsAdapter::set_framebuffer_to_big_endian_format()
{
dbgln_if(BXVGA_DEBUG, "BochsGraphicsAdapter set_framebuffer_to_big_endian_format");
full_memory_barrier();
if (m_registers->extension_regs.region_size == 0xFFFFFFFF || m_registers->extension_regs.region_size == 0)
return;
full_memory_barrier();
m_registers->extension_regs.framebuffer_byteorder = BOCHS_DISPLAY_BIG_ENDIAN;
full_memory_barrier();
}
void BochsGraphicsAdapter::set_framebuffer_to_little_endian_format()
{
dbgln_if(BXVGA_DEBUG, "BochsGraphicsAdapter set_framebuffer_to_little_endian_format");
full_memory_barrier();
if (m_registers->extension_regs.region_size == 0xFFFFFFFF || m_registers->extension_regs.region_size == 0)
return;
full_memory_barrier();
m_registers->extension_regs.framebuffer_byteorder = BOCHS_DISPLAY_LITTLE_ENDIAN;
full_memory_barrier();
}
UNMAP_AFTER_INIT BochsGraphicsAdapter::BochsGraphicsAdapter(PCI::Address pci_address)
: PCI::Device(pci_address)
, m_mmio_registers(PCI::get_BAR2(pci_address) & 0xfffffff0)
@ -153,6 +184,7 @@ void BochsGraphicsAdapter::set_resolution_registers(size_t width, size_t height)
m_registers->bochs_regs.enable = VBE_DISPI_ENABLED | VBE_DISPI_LFB_ENABLED;
full_memory_barrier();
m_registers->bochs_regs.bank = 0;
set_framebuffer_to_little_endian_format();
}
bool BochsGraphicsAdapter::try_to_set_resolution(size_t output_port_index, size_t width, size_t height)

3
Kernel/Graphics/Bochs/GraphicsAdapter.h
View file

@ -56,6 +56,9 @@ private:
bool validate_setup_resolution_with_io(size_t width, size_t height);
void set_y_offset(size_t);
void set_framebuffer_to_big_endian_format();
void set_framebuffer_to_little_endian_format();
PhysicalAddress m_mmio_registers;
Memory::TypedMapping<BochsDisplayMMIORegisters volatile> m_registers;
RefPtr<FramebufferDevice> m_framebuffer_device;