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mintsuki 2023-03-30 07:45:42 +02:00
parent 8e3d0d9991
commit ea23e9eaf2
1 changed files with 12 additions and 19 deletions
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31
kernel/kernel.c
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@ -6,8 +6,8 @@
// the compiler does not optimise them away, so, usually, they should // the compiler does not optimise them away, so, usually, they should
// be made volatile or equivalent. // be made volatile or equivalent.
static volatile struct limine_terminal_request terminal_request = { static volatile struct limine_framebuffer_request framebuffer_request = {
.id = LIMINE_TERMINAL_REQUEST, .id = LIMINE_FRAMEBUFFER_REQUEST,
.revision = 0 .revision = 0
}; };
@ -68,15 +68,6 @@ int memcmp(const void *s1, const void *s2, size_t n) {
return 0; return 0;
} }
// Our quick and dirty strlen() implementation.
size_t strlen(const char *str) {
size_t ret = 0;
while (*str++) {
ret++;
}
return ret;
}
// Halt and catch fire function. // Halt and catch fire function.
static void hcf(void) { static void hcf(void) {
asm ("cli"); asm ("cli");
@ -89,18 +80,20 @@ static void hcf(void) {
// If renaming _start() to something else, make sure to change the // If renaming _start() to something else, make sure to change the
// linker script accordingly. // linker script accordingly.
void _start(void) { void _start(void) {
// Ensure we got a terminal // Ensure we got a framebuffer.
if (terminal_request.response == NULL if (framebuffer_request.response == NULL
|| terminal_request.response->terminal_count < 1) { || framebuffer_request.response->framebuffer_count < 1) {
hcf(); hcf();
} }
// We should now be able to call the Limine terminal to print out // Fetch the first framebuffer.
// a simple "Hello World" to screen. struct limine_framebuffer *framebuffer = framebuffer_request.response->framebuffers[0];
const char *hello_msg = "Hello World";
struct limine_terminal *terminal = terminal_request.response->terminals[0]; // Note: we assume the framebuffer model is RGB with 32-bit pixels.
terminal_request.response->write(terminal, hello_msg, strlen(hello_msg)); for (size_t i = 0; i < 100; i++) {
uint32_t *fb_ptr = framebuffer->address;
fb_ptr[i * (framebuffer->pitch / 4) + i] = 0xffffff;
}
// We're done, just hang... // We're done, just hang...
hcf(); hcf();