EMK/emk
1
0
Fork 0
Code Issues Activity

feat/kernel: Added built-in UART support

Browse source
This commit is contained in:
Kevin Alavik 2025-05-14 13:33:38 +02:00
parent 9375cc74bd
commit 6cde9b4c19
Signed by: cmpsb
GPG key ID: 10D1CC0526FDC6D7
10 changed files with 295 additions and 91 deletions
Download patch file Download diff file Expand all files Collapse all files

99
kernel/src/emk.c
View file

@ -1,107 +1,26 @@
#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>
#include <boot/limine.h>
#include <arch/cpu.h>
#include <arch/io.h>
#include <dev/serial.h>
__attribute__((used, section(".limine_requests"))) static volatile LIMINE_BASE_REVISION(3);
__attribute__((used, section(".limine_requests"))) static volatile struct limine_framebuffer_request framebuffer_request = {
.id = LIMINE_FRAMEBUFFER_REQUEST,
.revision = 0};
__attribute__((used, section(".limine_requests_start"))) static volatile LIMINE_REQUESTS_START_MARKER;
__attribute__((used, section(".limine_requests_end"))) static volatile LIMINE_REQUESTS_END_MARKER;
void *memcpy(void *restrict dest, const void *restrict src, size_t n)
{
uint8_t *restrict pdest = (uint8_t *restrict)dest;
const uint8_t *restrict psrc = (const uint8_t *restrict)src;
for (size_t i = 0; i < n; i++)
{
pdest[i] = psrc[i];
}
return dest;
}
void *memset(void *s, int c, size_t n)
{
uint8_t *p = (uint8_t *)s;
for (size_t i = 0; i < n; i++)
{
p[i] = (uint8_t)c;
}
return s;
}
void *memmove(void *dest, const void *src, size_t n)
{
uint8_t *pdest = (uint8_t *)dest;
const uint8_t *psrc = (const uint8_t *)src;
if (src > dest)
{
for (size_t i = 0; i < n; i++)
{
pdest[i] = psrc[i];
}
}
else if (src < dest)
{
for (size_t i = n; i > 0; i--)
{
pdest[i - 1] = psrc[i - 1];
}
}
return dest;
}
int memcmp(const void *s1, const void *s2, size_t n)
{
const uint8_t *p1 = (const uint8_t *)s1;
const uint8_t *p2 = (const uint8_t *)s2;
for (size_t i = 0; i < n; i++)
{
if (p1[i] != p2[i])
{
return p1[i] < p2[i] ? -1 : 1;
}
}
return 0;
}
static void hcf(void)
{
asm("cli");
for (;;)
{
asm("hlt");
}
}
void emk_entry(void)
{
if (LIMINE_BASE_REVISION_SUPPORTED == false)
if (serial_init(COM1) != 0)
{
/* Just halt and say nothing */
hcf();
}
if (framebuffer_request.response == NULL || framebuffer_request.response->framebuffer_count < 1)
if (!LIMINE_BASE_REVISION_SUPPORTED)
{
serial_write(COM1, (uint8_t *)"ERROR: Limine base revision is not supported\n", 45);
hcf();
}
struct limine_framebuffer *framebuffer = framebuffer_request.response->framebuffers[0];
for (size_t i = 0; i < 100; i++)
{
volatile uint32_t *fb_ptr = framebuffer->address;
fb_ptr[i * (framebuffer->pitch / 4) + i] = 0xffffff;
}
hcf();
serial_write(COM1, (uint8_t *)"Hello, World!\n", 14);
hlt();
}