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Bootloader: Implement VESA video mode query and pass it to kernel

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Kernel now gets framebuffer from bootloader. Framebuffer dimensions
and bpp are hardcoded in bootloader, but will probably be read from
config file at some point.
This commit is contained in:
Bananymous
2023-11-17 22:45:35 +02:00
parent ac96ea3370
commit c9e9cfd361
6 changed files with 187 additions and 8 deletions
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14
kernel/include/kernel/BananBootloader.h
View File

@@ -2,7 +2,18 @@
#include <stdint.h>
#define BANAN_BOOTLOADER_MAGIC 0xD3C60CFF
#define BANAN_BOOTLOADER_MAGIC 0xD3C60CFF
#define BANAN_BOOTLOADER_FB_RGB 1
struct BananBootFramebufferInfo
{
uint32_t address;
uint32_t pitch;
uint32_t width;
uint32_t height;
uint8_t bpp;
uint8_t type;
};
struct BananBootloaderMemoryMapEntry
{
@@ -20,5 +31,6 @@ struct BananBootloaderMemoryMapInfo
struct BananBootloaderInfo
{
uint32_t command_line_addr;
uint32_t framebuffer_addr;
uint32_t memory_map_addr;
} __attribute__((packed));

11
kernel/kernel/BootInfo.cpp
View File

@@ -71,6 +71,17 @@ namespace Kernel
const char* command_line = reinterpret_cast<const char*>(banan_bootloader_info.command_line_addr);
MUST(g_boot_info.command_line.append(command_line));
const auto& framebuffer = *reinterpret_cast<BananBootFramebufferInfo*>(banan_bootloader_info.framebuffer_addr);
if (framebuffer.type == BANAN_BOOTLOADER_FB_RGB)
{
g_boot_info.framebuffer.address = framebuffer.address;
g_boot_info.framebuffer.width = framebuffer.width;
g_boot_info.framebuffer.height = framebuffer.height;
g_boot_info.framebuffer.pitch = framebuffer.pitch;
g_boot_info.framebuffer.bpp = framebuffer.bpp;
g_boot_info.framebuffer.type = FramebufferType::RGB;
}
const auto& memory_map = *reinterpret_cast<BananBootloaderMemoryMapInfo*>(banan_bootloader_info.memory_map_addr);
MUST(g_boot_info.memory_map_entries.resize(memory_map.entry_count));
for (size_t i = 0; i < memory_map.entry_count; i++)