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Switch into 1024x768x32bpp VESA LFB mode at boot.

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This is going to be pretty cool once I can hook up the Widgets/ code to it.
This commit is contained in:
Andreas Kling 2019-01-09 02:29:11 +01:00
parent 9963da9005
commit 659c54e32b
9 changed files with 172 additions and 2 deletions
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73
Kernel/Process.cpp
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@ -1811,3 +1811,76 @@ Unix::clock_t Process::sys$times(Unix::tms* times)
times->tms_cstime = m_ticks_in_kernel_for_dead_children;
return 0;
}
struct vbe_info_structure {
char signature[4]; // must be "VESA" to indicate valid VBE support
word version; // VBE version; high byte is major version, low byte is minor version
dword oem; // segment:offset pointer to OEM
dword capabilities; // bitfield that describes card capabilities
dword video_modes; // segment:offset pointer to list of supported video modes
word video_memory; // amount of video memory in 64KB blocks
word software_rev; // software revision
dword vendor; // segment:offset to card vendor string
dword product_name; // segment:offset to card model name
dword product_rev; // segment:offset pointer to product revision
char reserved[222]; // reserved for future expansion
char oem_data[256]; // OEM BIOSes store their strings in this area
} __attribute__ ((packed));
struct vbe_mode_info_structure {
word attributes; // deprecated, only bit 7 should be of interest to you, and it indicates the mode supports a linear frame buffer.
byte window_a; // deprecated
byte window_b; // deprecated
word granularity; // deprecated; used while calculating bank numbers
word window_size;
word segment_a;
word segment_b;
dword win_func_ptr; // deprecated; used to switch banks from protected mode without returning to real mode
word pitch; // number of bytes per horizontal line
word width; // width in pixels
word height; // height in pixels
byte w_char; // unused...
byte y_char; // ...
byte planes;
byte bpp; // bits per pixel in this mode
byte banks; // deprecated; total number of banks in this mode
byte memory_model;
byte bank_size; // deprecated; size of a bank, almost always 64 KB but may be 16 KB...
byte image_pages;
byte reserved0;
byte red_mask;
byte red_position;
byte green_mask;
byte green_position;
byte blue_mask;
byte blue_position;
byte reserved_mask;
byte reserved_position;
byte direct_color_attributes;
dword framebuffer; // physical address of the linear frame buffer; write here to draw to the screen
dword off_screen_mem_off;
word off_screen_mem_size; // size of memory in the framebuffer but not being displayed on the screen
byte reserved1[206];
} __attribute__ ((packed));
DisplayInfo Process::get_display_info()
{
DisplayInfo info;
//auto* vinfo = reinterpret_cast<vbe_info_structure*>(0xc000);
auto* vmode = reinterpret_cast<vbe_mode_info_structure*>(0x2000);
dbgprintf("VESA framebuffer, %ux%u, %u bpp @ P%x\n", vmode->width, vmode->height, vmode->bpp, vmode->framebuffer);
dbgprintf("Returning display info in %s<%u>\n", name().characters(), pid());
info.width = vmode->width;
info.height = vmode->height;
info.bpp = vmode->bpp;
info.pitch = vmode->pitch;
size_t framebuffer_size = info.pitch * info.height;
if (!m_display_framebuffer_region) {
auto framebuffer_vmo = VMObject::create_framebuffer_wrapper(PhysicalAddress(vmode->framebuffer), 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->linearAddress.asPtr();
return info;
}