Integrate flaterm terminal

kernel/Makefile

@@ -1,14 +1,22 @@
 .PHONY: all clean
 
 ARCH ?= x86_64
+PUTCHAR_ ?= fb
 
 CFLAGS := -ffreestanding -Wall -Wextra -g -fcommon -nostdinc
 
 CFLAGS += -I. \
 					-I../limine \
 					-I./std/include \
+					-I./flanterm/src \
 					-DPRINTF_INCLUDE_CONFIG_H=1
 
+ifeq ($(PUTCHAR_),fb)
+CFLAGS += -DPUTCHAR_=PUTCHAR_FB
+else
+CFLAGS += -DPUTCHAR_=PUTCHAR_SERIAL
+endif
+
 LDFLAGS := -nostdlib -static -T arch/$(ARCH)/link.ld
 
 include arch/$(ARCH)/$(ARCH).mk
@@ -20,10 +28,14 @@ SRCFILES := $(wildcard *.c) \
 	$(wildcard pmm/*.c) \
 	$(wildcard bootinfo/*.c) \
 	$(wildcard spinlock/*.c) \
+	$(wildcard term/*.c) \
 	$(wildcard hal/*.c) \
 	$(wildcard hal/$(ARCH)/*.c) \
 	$(wildcard hal/$(ARCH)/*.S) \
-	$(wildcard *.S)
+	$(wildcard *.S) \
+	$(wildcard std/*.c) \
+	$(wildcard flanterm/src/*.c) \
+	$(wildcard flanterm/src/flanterm_backends/*.c)
 CFILES := $(filter %.c,$(SRCFILES))
 ASFILES := $(filter %.S,$(SRCFILES))
 OBJ := $(patsubst %.c,%.o,$(CFILES)) $(patsubst %.S,%.o,$(ASFILES))

kernel/bootinfo/bootinfo.c

@@ -36,7 +36,16 @@ static volatile struct limine_rsdp_request RSDP_REQ = {
   .id = LIMINE_RSDP_REQUEST, .revision = 0,
 };
 
+static volatile struct limine_framebuffer_request FB_REQ = {
+  .id = LIMINE_FRAMEBUFFER_REQUEST, .revision = 0,
+};
+
 void bootinfo_init(void) {
+  if (FB_REQ.response == NULL || FB_REQ.response->framebuffer_count < 1) {
+    hal_hang();
+  }
+  BOOT_INFO.fb = FB_REQ.response->framebuffers[0];
+
   struct limine_paging_mode_response *pagingres = PAGING_REQ.response;
 #if defined(__x86_64__)
   if (pagingres->mode != LIMINE_PAGING_MODE_X86_64_4LVL) {

kernel/bootinfo/bootinfo.h

@@ -21,6 +21,7 @@ typedef struct {
   LIMINE_PTR(struct limine_memmap_entry **) memmap_entries;
   LIMINE_PTR(struct limine_smp_response *) smp;
   uint64_t smp_bspindex;
+  LIMINE_PTR(struct limine_framebuffer *) fb;
 } BootInfo;
 
 extern BootInfo BOOT_INFO;

kernel/flanterm/.gitignore

@@ -0,0 +1,2 @@
+*.d
+*.o

kernel/flanterm/LICENSE

@@ -0,0 +1,22 @@
+Copyright (C) 2022-2025 mintsuki and contributors.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

kernel/flanterm/README.md

@@ -0,0 +1,43 @@
+# Flanterm
+
+Flanterm is a fast and reasonably complete terminal emulator with support for
+multiple output backends. Included is a fast framebuffer backend.
+
+### Quick usage
+
+To quickly set up and use a framebuffer Flanterm instance, it is possible to
+use the `flanterm_fb_init()` function as such:
+```c
+#include <flanterm.h>
+#include <flanterm_backends/fb.h>
+
+struct flanterm_context *ft_ctx = flanterm_fb_init(
+        NULL,
+        NULL,
+        framebuffer_ptr, width, height, pitch,
+        red_mask_size, red_mask_shift,
+        green_mask_size, green_mask_shift,
+        blue_mask_size, blue_mask_shift,
+        NULL,
+        NULL, NULL,
+        NULL, NULL,
+        NULL, NULL,
+        NULL, 0, 0, 1,
+        0, 0,
+        0
+    );
+```
+Where `framebuffer_ptr, width, height, pitch` and `{red,green,blue}_mask_{size,shift}`
+represent the corresponding info about the framebuffer to use for this given instance.
+
+The meaning of the other arguments can be found in `flanterm_backends/fb.h`.
+
+To then print to the terminal instance, simply use the `flanterm_write()`
+function on the given instance. For example:
+```c
+#include <flanterm/flanterm.h>
+
+const char msg[] = "Hello world\n";
+
+flanterm_write(ft_ctx, msg, sizeof(msg));
+```

kernel/flanterm/src/flanterm.h

@@ -0,0 +1,80 @@
+/* Copyright (C) 2022-2025 mintsuki and contributors.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef FLANTERM_H
+#define FLANTERM_H 1
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define FLANTERM_CB_DEC 10
+#define FLANTERM_CB_BELL 20
+#define FLANTERM_CB_PRIVATE_ID 30
+#define FLANTERM_CB_STATUS_REPORT 40
+#define FLANTERM_CB_POS_REPORT 50
+#define FLANTERM_CB_KBD_LEDS 60
+#define FLANTERM_CB_MODE 70
+#define FLANTERM_CB_LINUX 80
+
+#define FLANTERM_OOB_OUTPUT_OCRNL (1 << 0)
+#define FLANTERM_OOB_OUTPUT_OFDEL (1 << 1)
+#define FLANTERM_OOB_OUTPUT_OFILL (1 << 2)
+#define FLANTERM_OOB_OUTPUT_OLCUC (1 << 3)
+#define FLANTERM_OOB_OUTPUT_ONLCR (1 << 4)
+#define FLANTERM_OOB_OUTPUT_ONLRET (1 << 5)
+#define FLANTERM_OOB_OUTPUT_ONOCR (1 << 6)
+#define FLANTERM_OOB_OUTPUT_OPOST (1 << 7)
+
+#ifdef FLANTERM_IN_FLANTERM
+
+#include "flanterm_private.h"
+
+#else
+
+struct flanterm_context;
+
+#endif
+
+void flanterm_write(struct flanterm_context *ctx, const char *buf, size_t count);
+void flanterm_flush(struct flanterm_context *ctx);
+void flanterm_full_refresh(struct flanterm_context *ctx);
+void flanterm_deinit(struct flanterm_context *ctx, void (*_free)(void *ptr, size_t size));
+
+void flanterm_get_dimensions(struct flanterm_context *ctx, size_t *cols, size_t *rows);
+void flanterm_set_autoflush(struct flanterm_context *ctx, bool state);
+void flanterm_set_callback(struct flanterm_context *ctx, void (*callback)(struct flanterm_context *, uint64_t, uint64_t, uint64_t, uint64_t));
+uint64_t flanterm_get_oob_output(struct flanterm_context *ctx);
+void flanterm_set_oob_output(struct flanterm_context *ctx, uint64_t oob_output);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

kernel/flanterm/src/flanterm_backends/fb.h

@@ -0,0 +1,68 @@
+/* Copyright (C) 2022-2025 mintsuki and contributors.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef FLANTERM_FB_H
+#define FLANTERM_FB_H 1
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "../flanterm.h"
+
+#ifdef FLANTERM_IN_FLANTERM
+
+#include "fb_private.h"
+
+#endif
+
+struct flanterm_context *flanterm_fb_init(
+    /* If _malloc and _free are nulled, use the bump allocated instance (1 use only). */
+    void *(*_malloc)(size_t size),
+    void (*_free)(void *ptr, size_t size),
+    uint32_t *framebuffer, size_t width, size_t height, size_t pitch,
+    uint8_t red_mask_size, uint8_t red_mask_shift,
+    uint8_t green_mask_size, uint8_t green_mask_shift,
+    uint8_t blue_mask_size, uint8_t blue_mask_shift,
+    uint32_t *canvas, /* If nulled, no canvas. */
+    uint32_t *ansi_colours, uint32_t *ansi_bright_colours, /* If nulled, default. */
+    uint32_t *default_bg, uint32_t *default_fg, /* If nulled, default. */
+    uint32_t *default_bg_bright, uint32_t *default_fg_bright, /* If nulled, default. */
+    /* If font is null, use default font and font_width and font_height ignored. */
+    void *font, size_t font_width, size_t font_height, size_t font_spacing,
+    /* If scale_x and scale_y are 0, automatically scale font based on resolution. */
+    size_t font_scale_x, size_t font_scale_y,
+    size_t margin
+);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

kernel/flanterm/src/flanterm_backends/fb_private.h

@@ -0,0 +1,121 @@
+/* Copyright (C) 2022-2025 mintsuki and contributors.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef FLANTERM_FB_PRIVATE_H
+#define FLANTERM_FB_PRIVATE_H 1
+
+#ifndef FLANTERM_IN_FLANTERM
+#error "Do not use fb_private.h. Use interfaces defined in fb.h only."
+#endif
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define FLANTERM_FB_FONT_GLYPHS 256
+
+struct flanterm_fb_char {
+    uint32_t c;
+    uint32_t fg;
+    uint32_t bg;
+};
+
+struct flanterm_fb_queue_item {
+    size_t x, y;
+    struct flanterm_fb_char c;
+};
+
+struct flanterm_fb_context {
+    struct flanterm_context term;
+
+    void (*plot_char)(struct flanterm_context *ctx, struct flanterm_fb_char *c, size_t x, size_t y);
+
+    size_t font_width;
+    size_t font_height;
+    size_t glyph_width;
+    size_t glyph_height;
+
+    size_t font_scale_x;
+    size_t font_scale_y;
+
+    size_t offset_x, offset_y;
+
+    volatile uint32_t *framebuffer;
+    size_t pitch;
+    size_t width;
+    size_t height;
+    size_t bpp;
+
+    uint8_t red_mask_size, red_mask_shift;
+    uint8_t green_mask_size, green_mask_shift;
+    uint8_t blue_mask_size, blue_mask_shift;
+
+    size_t font_bits_size;
+    uint8_t *font_bits;
+    size_t font_bool_size;
+    bool *font_bool;
+
+    uint32_t ansi_colours[8];
+    uint32_t ansi_bright_colours[8];
+    uint32_t default_fg, default_bg;
+    uint32_t default_fg_bright, default_bg_bright;
+
+    size_t canvas_size;
+    uint32_t *canvas;
+
+    size_t grid_size;
+    size_t queue_size;
+    size_t map_size;
+
+    struct flanterm_fb_char *grid;
+
+    struct flanterm_fb_queue_item *queue;
+    size_t queue_i;
+
+    struct flanterm_fb_queue_item **map;
+
+    uint32_t text_fg;
+    uint32_t text_bg;
+    size_t cursor_x;
+    size_t cursor_y;
+
+    uint32_t saved_state_text_fg;
+    uint32_t saved_state_text_bg;
+    size_t saved_state_cursor_x;
+    size_t saved_state_cursor_y;
+
+    size_t old_cursor_x;
+    size_t old_cursor_y;
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

kernel/flanterm/src/flanterm_private.h

@@ -0,0 +1,122 @@
+/* Copyright (C) 2022-2025 mintsuki and contributors.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef FLANTERM_PRIVATE_H
+#define FLANTERM_PRIVATE_H 1
+
+#ifndef FLANTERM_IN_FLANTERM
+#error "Do not use flanterm_private.h. Use interfaces defined in flanterm.h only."
+#endif
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define FLANTERM_MAX_ESC_VALUES 16
+
+struct flanterm_context {
+    /* internal use */
+
+    size_t tab_size;
+    bool autoflush;
+    bool cursor_enabled;
+    bool scroll_enabled;
+    bool control_sequence;
+    bool escape;
+    bool osc;
+    bool osc_escape;
+    bool rrr;
+    bool discard_next;
+    bool bold;
+    bool bg_bold;
+    bool reverse_video;
+    bool dec_private;
+    bool insert_mode;
+    uint64_t code_point;
+    size_t unicode_remaining;
+    uint8_t g_select;
+    uint8_t charsets[2];
+    size_t current_charset;
+    size_t escape_offset;
+    size_t esc_values_i;
+    size_t saved_cursor_x;
+    size_t saved_cursor_y;
+    size_t current_primary;
+    size_t current_bg;
+    size_t scroll_top_margin;
+    size_t scroll_bottom_margin;
+    uint32_t esc_values[FLANTERM_MAX_ESC_VALUES];
+    uint64_t oob_output;
+    bool saved_state_bold;
+    bool saved_state_bg_bold;
+    bool saved_state_reverse_video;
+    size_t saved_state_current_charset;
+    size_t saved_state_current_primary;
+    size_t saved_state_current_bg;
+
+    /* to be set by backend */
+
+    size_t rows, cols;
+
+    void (*raw_putchar)(struct flanterm_context *, uint8_t c);
+    void (*clear)(struct flanterm_context *, bool move);
+    void (*set_cursor_pos)(struct flanterm_context *, size_t x, size_t y);
+    void (*get_cursor_pos)(struct flanterm_context *, size_t *x, size_t *y);
+    void (*set_text_fg)(struct flanterm_context *, size_t fg);
+    void (*set_text_bg)(struct flanterm_context *, size_t bg);
+    void (*set_text_fg_bright)(struct flanterm_context *, size_t fg);
+    void (*set_text_bg_bright)(struct flanterm_context *, size_t bg);
+    void (*set_text_fg_rgb)(struct flanterm_context *, uint32_t fg);
+    void (*set_text_bg_rgb)(struct flanterm_context *, uint32_t bg);
+    void (*set_text_fg_default)(struct flanterm_context *);
+    void (*set_text_bg_default)(struct flanterm_context *);
+    void (*set_text_fg_default_bright)(struct flanterm_context *);
+    void (*set_text_bg_default_bright)(struct flanterm_context *);
+    void (*move_character)(struct flanterm_context *, size_t new_x, size_t new_y, size_t old_x, size_t old_y);
+    void (*scroll)(struct flanterm_context *);
+    void (*revscroll)(struct flanterm_context *);
+    void (*swap_palette)(struct flanterm_context *);
+    void (*save_state)(struct flanterm_context *);
+    void (*restore_state)(struct flanterm_context *);
+    void (*double_buffer_flush)(struct flanterm_context *);
+    void (*full_refresh)(struct flanterm_context *);
+    void (*deinit)(struct flanterm_context *, void (*)(void *, size_t));
+
+    /* to be set by client */
+
+    void (*callback)(struct flanterm_context *, uint64_t, uint64_t, uint64_t, uint64_t);
+};
+
+void flanterm_context_reinit(struct flanterm_context *ctx);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

kernel/hal/hal.h

@@ -2,15 +2,15 @@
 #define KERNEL_HAL_HAL_H_
 
 #include <stdint.h>
-
-#include "util.h"
+#include <stddef.h>
 
 __attribute__((noreturn)) void hal_hang(void);
 
 void hal_init(void);
 void hal_intr_disable(void);
 void hal_intr_enable(void);
-void hal_memset(void *mem, uint8_t v, uint32_t size);
+void *hal_memset(void *p, int c, size_t n);
+void *hal_memcpy(void *dst, const void *src, size_t n);
 
 #if defined(__x86_64__)
 # define HAL_PAGE_SIZE 0x1000

kernel/hal/util.c

@@ -1,9 +1,16 @@
 #include <stdint.h>
+#include <stddef.h>
 #include "hal.h"
 
-void hal_memset(void *mem, uint8_t v, uint32_t size) {
-  uint8_t *mem1 = mem;
-  for (uint32_t i = 0; i < size; i++) {
-    mem1[i] = v;
-  }
+void *hal_memset(void *p, int c, size_t n) {
+  char *cp = p;
+  for (size_t i = 0; i < n; i++) cp[i] = c;
+  return p;
+}
+
+void *hal_memcpy(void *dst, const void *src, size_t n) {
+  char *a = dst;
+  const char *b = src;
+  for (size_t i = 0; i < n; i++) a[i] = b[i];
+  return dst;
 }

kernel/hal/util.h

@@ -1,6 +0,0 @@
-#ifndef HAL_UTIL_H_
-#define HAL_UTIL_H_
-
-#define HAL_MEMSET(m, v, n) hal_memset((void *)(m), (v), (n))
-
-#endif // HAL_UTIL_H_

kernel/hal/x86_64/gdt.c

@@ -68,7 +68,7 @@ void gdt_init(void) {
   uint64_t base = gdt_curretbase();
   curgdt = (ExtendedGdt *)base;
 
-  HAL_MEMSET(&tss, 0, sizeof(tss));
+  hal_memset(&tss, 0, sizeof(tss));
   tss.iopb_off = sizeof(tss);
 
   uint64_t tss_base = (uint64_t)&tss;

kernel/hal/x86_64/serial.c

@@ -1,6 +1,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include "io.h"
+#include "putchar.h"
 
 #define SERIAL_PORT 0x3f8
 
@@ -42,7 +43,9 @@ bool serial_init(void) {
   return true;
 }
 
-// For printf library
-void putchar_(char c) {
-  serial_write(c);
-}
+#if PUTCHAR_ == PUTCHAR_SERIAL
+  // For printf library
+  void putchar_(char c) {
+    serial_write(c);
+  }
+#endif

kernel/kmain.c

@@ -4,6 +4,7 @@
 #include "hal/hal.h"
 #include "bootinfo/bootinfo.h"
 #include "pmm/pmm.h"
+#include "term/term.h"
 
 static volatile LIMINE_BASE_REVISION(2);
 
@@ -13,6 +14,7 @@ void kmain(void) {
   }
 
   bootinfo_init();
+  term_init();
   hal_init();
   pmm_init();
 

kernel/pmm/pmm.c

@@ -38,7 +38,7 @@ void pmm_init(void) {
   size_t physbegin = memmap_ent->base;
   bm->map = (uint8_t *)(physbegin + BOOT_INFO.hhdm_off);
 
-  HAL_MEMSET(bm->map, 0xff, bm->nbytes);
+  hal_memset(bm->map, 0xff, bm->nbytes);
   for (size_t i = 0; i < BOOT_INFO.memmap_entrycount; i++) {
     struct limine_memmap_entry *entry = BOOT_INFO.memmap_entries[i];
     // mark usable as 0 and unusable as 1

kernel/putchar.h

@@ -0,0 +1,7 @@
+#ifndef PUTCHAR_H_
+#define PUTCHAR_H_
+
+#define PUTCHAR_FB 1
+#define PUTCHAR_SERIAL 2
+
+#endif // PUTCHAR_H_

kernel/std/string.c

@@ -0,0 +1,10 @@
+#include <stddef.h>
+#include "hal/hal.h"
+
+void *memset(void *p, int c, size_t n) {
+  return hal_memset(p,c,n);
+}
+
+void *memcpy(void *dst, const void *src, size_t n) {
+  return hal_memcpy(dst,src,n);
+}

kernel/term/term.c

@@ -0,0 +1,45 @@
+#include "flanterm.h"
+#include "flanterm_backends/fb.h"
+#include "spinlock/spinlock.h"
+#include "bootinfo/bootinfo.h"
+#include "term.h"
+#include "putchar.h"
+
+Term TERM;
+
+void term_init(void) {
+  spinlock_init(&TERM.spinlock);
+  TERM.ftctx = flanterm_fb_init(
+    NULL, NULL,
+    BOOT_INFO.fb->address,
+    BOOT_INFO.fb->width,
+    BOOT_INFO.fb->height,
+    BOOT_INFO.fb->pitch,
+    BOOT_INFO.fb->red_mask_size,
+    BOOT_INFO.fb->red_mask_shift,
+    BOOT_INFO.fb->green_mask_size,
+    BOOT_INFO.fb->green_mask_shift,
+    BOOT_INFO.fb->blue_mask_size,
+    BOOT_INFO.fb->blue_mask_shift,
+    NULL,
+    NULL, NULL,
+    NULL, NULL,
+    NULL, NULL,
+    NULL, 0, 0, 1,
+    0, 0,
+    0
+  );
+}
+
+void term_write(const char *s, size_t len) {
+  spinlock_acquire(&TERM.spinlock);
+  flanterm_write(TERM.ftctx, s, len);
+  spinlock_release(&TERM.spinlock);
+}
+
+#if PUTCHAR_ == PUTCHAR_FB
+  // For printf library
+  void putchar_(char c) {
+    term_write(&c, 1);
+  }
+#endif

kernel/term/term.h

@@ -0,0 +1,17 @@
+#ifndef TERM_TERM_H_
+#define TERM_TERM_H_
+
+#include "flanterm.h"
+#include "flanterm_backends/fb.h"
+#include "spinlock/spinlock.h"
+
+typedef struct {
+  SpinLock spinlock;
+  struct flanterm_context *ftctx;
+} Term;
+
+extern Term TERM;
+
+void term_init(void);
+
+#endif // TERM_TERM_H_