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#include <stdint.h>
#include <stddef.h>
#include "limine.h"
namespace {
__attribute__((used, section(".requests")))
volatile LIMINE_BASE_REVISION(2);
}
namespace {
__attribute__((used, section(".requests")))
volatile limine_framebuffer_request framebuffer_request = {
.id = LIMINE_FRAMEBUFFER_REQUEST,
.revision = 0,
.response = nullptr
};
}
namespace {
__attribute__((used, section(".requests_start_marker")))
volatile LIMINE_REQUESTS_START_MARKER;
__attribute__((used, section(".requests_end_marker")))
volatile LIMINE_REQUESTS_END_MARKER;
}
namespace {
void hcf() {
asm("cli");
for (;;) {
asm("hlt");
}
}
}
extern void (*__init_array[])();
extern void (*__init_array_end[])();
extern "C" void kernel_main();
extern "C" void _start() {
if (!LIMINE_BASE_REVISION_SUPPORTED) {
hcf();
}
// initialize global constructors
for (size_t i = 0; &__init_array[i] != __init_array_end; i++) {
__init_array[i]();
}
// Ensure we got a framebuffer.
if (framebuffer_request.response == nullptr
|| framebuffer_request.response->framebuffer_count < 1) {
hcf();
}
// Fetch the first framebuffer.
limine_framebuffer *framebuffer = framebuffer_request.response->framebuffers[0];
// Note: we assume the framebuffer model is RGB with 32-bit pixels.
for (size_t i = 0; i < 100; i++) {
volatile uint32_t *fb_ptr = static_cast<volatile uint32_t *>(framebuffer->address);
fb_ptr[i * (framebuffer->pitch / 4) + i] = 0xffffff;
}
// We're done, just hang...
hcf();
}
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