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Output to console

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This commit is contained in:
Alex Kotov 2022-01-12 15:31:04 +05:00
parent 426519ec2e
commit 3ca2b71488
Signed by: kotovalexarian
GPG key ID: 553C0EBBEB5D5F08
2 changed files with 24 additions and 0 deletions
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1
examples/kernel-stivale2-limine/expected.txt
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@ -0,0 +1 @@
Hello, World!

23
examples/kernel-stivale2-limine/main.c
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@ -4,6 +4,7 @@
#include "stivale2.h"
static void poweroff();
static void putc(char c);
// We need to tell the stivale bootloader where we want our stack to be.
// We are going to allocate our stack as an array in .bss.
@ -104,6 +105,21 @@ void *stivale2_get_tag(struct stivale2_struct *stivale2_struct, uint64_t id) {
// The following will be our kernel's entry point.
void _start(struct stivale2_struct *stivale2_struct __attribute__((unused))) {
putc('H');
putc('e');
putc('l');
putc('l');
putc('o');
putc(',');
putc(' ');
putc('W');
putc('o');
putc('r');
putc('l');
putc('d');
putc('!');
putc('\n');
poweroff();
}
@ -113,3 +129,10 @@ void poweroff()
const uint16_t value = 0x2000;
__asm__ volatile("outw %1, %0" : : "dN" (port), "a" (value));
}
void putc(const char c)
{
const uint16_t port = 0x3F8;
const uint16_t value = c;
__asm__ volatile("outw %1, %0" : : "dN" (port), "a" (value));
}