term: depreciate rt, and switch to flanterm

kernel/src/font.h

@@ -1,4 +1,3 @@
 #pragma once
 
-extern unsigned char VGA8[];
-extern unsigned char NotoRegular[];
+extern unsigned char VGA8[];

kernel/src/lib/gcc.c

@@ -0,0 +1,18 @@
+#include <stdint.h>
+/*int __eqdf2(double a, double b) {
+    union { double f; uint64_t i; } ua = { a }, ub = { b };
+    return ua.i == ub.i;
+}
+int __ltdf2(double a, double b) {
+    if (a < b) return -1;
+    if (a > b) return 1;
+    return 0;
+}
+double __truncxfdf2(double x) {
+    return (double)x;
+}
+int __gtdf2(double a, double b) {
+    if (a > b) return 1;
+    if (a < b) return -1;
+    return 0;
+}**/

kernel/src/main.c

@@ -1,29 +1,23 @@
 #include "exec/elf.h"
-#include "font.h"
 #include "mm/pmm.h"
 #include "mm/vma.h"
 #include "mm/vmm.h"
 #include "mm/liballoc/liballoc.h"
-#include "mm/memop.h"
-#include "rt.h"
 #include "sched/sched.h"
-#include "sys/arch/x86_64/cpuid.h"
-#include "sys/arch/x86_64/io.h"
 #include "sys/arch/x86_64/pit.h"
-#include "sys/arch/x86_64/rtc.h"
 #include "sys/arch/x86_64/sse.h"
 #include <sys/log.h>
 #include <stdint.h>
 #include <stddef.h>
 #include <stdbool.h>
 #include <limine.h>
-
 #include <sys/printf.h>
 #include <sys/arch/x86_64/gdt.h>
 #include <sys/arch/x86_64/idt.h>
-
-#define SSFN_IMPLEMENTATION        /* use the special renderer for 32 bit truecolor packed pixels */
-#include <sys/gfx/ssfn.h>
+#include <sys/arch/x86_64/fpu.h>
+#include <sys/gfx/flanterm/flanterm.h>
+#include <sys/gfx/flanterm/backends/fb.h>
+#include <font.h>
 
 // Set the base revision to 3, this is recommended as this is the latest
 // base revision described by the Limine boot protocol specification.
@@ -77,15 +71,9 @@ static void hcf(void) {
     }
 }
 
-
-
-int init() {
-    asm("int $0x80");
-    while (1)
-        ;;
-}
-
 struct limine_framebuffer *fb;
+struct flanterm_context *ft_ctx;
+uint32_t fg = 0xFFFFFF;
 
 char kstack[8192];
 
@@ -107,21 +95,42 @@ void kmain(void) {
     // Fetch the first framebuffer.
     struct limine_framebuffer *framebuffer = framebuffer_request.response->framebuffers[0];
     fb = framebuffer;
+    ((uint32_t*)fb->address)[0] = 0xFFFFFF;
 
-    rt_context ctx;
-    ctx.framebuffer = fb->address;
-    ctx.framebuffer_width = fb->width;
-    ctx.framebuffer_height = fb->height;
-    rt_init(ctx);
+    ft_ctx = flanterm_fb_init(
+        NULL,
+        NULL,
+        framebuffer->address, framebuffer->width, framebuffer->height, framebuffer->pitch,
+        framebuffer->red_mask_size, framebuffer->red_mask_shift,
+        framebuffer->green_mask_size, framebuffer->green_mask_shift,
+        framebuffer->blue_mask_size, framebuffer->blue_mask_shift,
+        NULL,
+        NULL, NULL,
+        NULL, &fg,
+        NULL, NULL,
+        VGA8, 8, 16, 0,
+        0, 0,
+        0
+    );
+
+    if (!ft_ctx) {
+        asm("cli");
+        asm("hlt");
+    }
 
     printf("\n  Soaplin 1.0-sild is booting up your computer...\n\n");
     //printf("Physical kernel EP: %p", entrypoint_request.entry);
     
     gdt_init(&kstack[8192]);
     idt_init();
+    fpu_activate();
 
     sse_init();
 
+float hi = 0.1;
+hi = hi + 1.1;
+log("fp: %2.6f\n", hi);
+
     pmm_init();
     vmm_init();
     kernel_vma_context = vma_create_context(vmm_kernel_pm);
@@ -132,10 +141,10 @@ void kmain(void) {
             asm("hlt");
     }
 
-    char *a = kmalloc(1);
+    char *a = malloc(1);
     *a = 32;
     log("Allocated 1 byte at 0x%.16llx\n", (uint64_t)a);
-    kfree(a);
+    free(a);
 
     pit_init(1000);
     sched_init();
@@ -146,48 +155,7 @@ void kmain(void) {
 
     elf_load((char*)f->address);
 
-    memset(framebuffer->address, 0, framebuffer->pitch * framebuffer->height);
-
-    ssfn_t sctx = { 0 };                                 /* the renderer context */
-    ssfn_buf_t buf = {                                  /* the destination pixel buffer */
-        .ptr = framebuffer->address,                      /* address of the buffer */
-        .w = framebuffer->width,                             /* width */
-        .h = framebuffer->height,                             /* height */
-        .p = framebuffer->pitch,                         /* bytes per line */
-        .x = 100,                                       /* pen position */
-        .y = 100,
-        .fg = 0xFF808080                                /* foreground color */
-    };
-    
-    /* add one or more fonts to the context. Fonts must be already in memory */
-    ssfn_load(&sctx, &NotoRegular);
-    
-    /* select the typeface to use */
-    ssfn_select(&sctx,
-        SSFN_FAMILY_SANS, NULL,                        /* family */
-        SSFN_STYLE_REGULAR | SSFN_STYLE_UNDERLINE,      /* style */
-        64                                              /* size */
-    );
-    
-    /* rasterize the first glyph in an UTF-8 string into a 32 bit packed pixel buffer */
-    /* returns how many bytes were consumed from the string */
-    ssfn_render(&sctx, &buf, "Hello World.");
-
-    /* free resources */
-    ssfn_free(&sctx); 
-    
-
-    //uint8_t *mem = pmm_request_page();
-    //mem[0] = 0xCD;
-    //mem[1] = 0x80;
-    //mem[2] = 0xF4;
-
-    //mem[3] = 0xFE;
-    //pagemap_t* pm = vmm_alloc_pm();
-    //vmm_map(pm, 0x1000, (uint64_t)mem, VMM_PRESENT | VMM_USER);
-    //sched_create("Init", 0x1000, pm, SCHED_USER_PROCESS);
-
-    //log("kernel - Soaplin initialized sucessfully.\n");
+    log("kernel - Soaplin initialized sucessfully.\n");
     while (1)
         ;;//__asm__ volatile ("hlt");
 }

kernel/src/mm/liballoc/liballoc.h

@@ -6,7 +6,7 @@
 #include <stdint.h>
 #include <sys/log.h>
 
-#define PREFIX(func) k##func
+#define PREFIX(func) func
 
 #ifdef _DEBUG
 void liballoc_dump();

kernel/src/mm/liballoc/liballoc_soaplin.c

@@ -33,7 +33,8 @@ int liballoc_free(void *ptr, size_t pages)
 }
 
 
-extern void *malloc(size_t s) { return PREFIX(malloc)(s); }
-extern void *realloc(void *v, size_t s) { return PREFIX(realloc)(v, s); }
-extern void *calloc(size_t s1, size_t s) { return PREFIX(calloc)(s1, s); }
-extern void free(void *v) { return PREFIX(free)(v); }
+
+ //void *malloc(size_t s) { return PREFIX(malloc)(s); }
+ //void *realloc(void *v, size_t s) { return PREFIX(realloc)(v, s); }
+ //void *calloc(size_t s1, size_t s) { return PREFIX(calloc)(s1, s); }
+ //void free(void *v) { return PREFIX(free)(v); }

kernel/src/rt.c

@@ -1,85 +0,0 @@
-#include "rt.h"
-#include <font.h>
-#include <stdint.h>
-#include <mm/memop.h>
-
-static rt_context _curctx;
-
-void _rt_drawchar(unsigned char c, int x, int y, int fgcolor, int bgcolor)
-{
-	int cx,cy;
-	int mask[8]={128, 64, 32, 16, 8, 4, 2, 1};
-	unsigned char *glyph=VGA8+(int)c*16;
-
-    uint32_t *buf = _curctx.framebuffer;
-
-	for(cy=0;cy<16;cy++){
-		for(cx=0;cx<8;cx++){
-            buf[((y + cy) * _curctx.framebuffer_width) + (x + cx)] = glyph[cy]&mask[cx]?fgcolor:bgcolor;
-		}
-	}
-}
-void _rt_draw_fillchar(int x, int y, int bgcolor, int fgcolor) {
-	int cx,cy;
-    uint32_t *buf = _curctx.framebuffer;
-	for(cy=0;cy<16;cy++){
-		for(cx=0;cx<8;cx++){
-            buf[((y + cy) * _curctx.framebuffer_width) + (x + cx)] = cy > 12 ? fgcolor : bgcolor;
-		}
-	}
-}
-
-int _rt_strlen(char *str) {
-    int i = 0;
-    while (str[i] != '\0') i++;
-    return i;
-}
-
-void rt_init(rt_context ctx) {
-    // Copy the structure
-    char *src = (char*)&ctx;
-    char *dst = (char*)&_curctx;
-    for (unsigned long i = 0; i < sizeof(rt_context); i++) {
-        dst[i] = src[i];
-    }
-
-    // Fill fields
-    _curctx.term_width = _curctx.framebuffer_width / 8;
-    _curctx.term_height = _curctx.framebuffer_height / 16;
-}
-
-void rt_print(char *str) {
-    _rt_draw_fillchar(_curctx.x * 8, _curctx.y * 16, 0x0, 0x0);
-
-    for (int i = 0; i < _rt_strlen(str); i++) {
-        if (str[i] == '\n' && _curctx.use_crlf_ending)
-            if (_curctx.y * 16 >= (int)_curctx.framebuffer_height) {
-                _curctx.y = 0;
-                memset(
-                    _curctx.framebuffer, _curctx.bg_color,
-                    _curctx.framebuffer_width * _curctx.framebuffer_height * sizeof(uint32_t));
-            } else {
-                _curctx.y++;
-            }
-        else if (str[i] == '\n')
-        {
-            if (_curctx.y * 16 >= (int)_curctx.framebuffer_height) {
-                _curctx.y = 0;
-                memset(
-                    _curctx.framebuffer, _curctx.bg_color,
-                    _curctx.framebuffer_width * _curctx.framebuffer_height * sizeof(uint32_t));
-            } else {
-                _curctx.y++;
-            }
-            _curctx.x = 0;
-        }
-        else if (str[i] == '\r')
-            _curctx.x = 0;
-        else {
-            _rt_drawchar(str[i], _curctx.x * 8, _curctx.y * 16, 0xFFFFFF, 0x0);
-            _curctx.x++;
-        }
-    }
-
-    _rt_draw_fillchar(_curctx.x * 8, _curctx.y * 16, 0x0, 0xFFFFFF);
-}

kernel/src/rt.h

@@ -1,41 +0,0 @@
-#pragma once
-
-#include <stdint.h>
-
-typedef struct _rt_ctx {
-  // A pointer to the framebuffer.
-  void *framebuffer;
-
-  // The framebuffer width, in pixels.
-  uint32_t framebuffer_width;
-
-  // The framebuffer height, in pixels.
-  uint32_t framebuffer_height;
-
-  // Set this to 1 if you prefer using DOS line endings to UNIX line endings.
-  int use_crlf_ending;
-
-  // Do we need to show a cursor after printing text?
-  int show_cursor;
-
-  // The background color
-  uint32_t bg_color;
-
-  // The foreground color
-  uint32_t fg_color;
-
-  /*
-   * Do NOT modify everything below me!
-   */
-  // The terminal's width, in columns of 8 pixels.
-  int term_width;
-  // The terminal's height, in rows of 16 pixels.
-  int term_height;
-  // The X position of the cursor, in columns of 8 pixels.
-  int x;
-  // The Y position of the cursor, in rows of 16 pixels.
-  int y;
-} rt_context;
-
-void rt_init(rt_context ctx);
-void rt_print(char *str);

kernel/src/sys/arch/x86_64/fpu.c

@@ -0,0 +1,14 @@
+#include <stddef.h>
+#include <stdint.h>
+
+void fpu_set_cw(const uint16_t cw) {
+	asm volatile("fldcw %0" :: "m"(cw));
+}
+
+void fpu_activate() {
+	size_t cr4;
+	asm volatile ("mov %%cr4, %0" : "=r"(cr4));
+	cr4 |= 0x200;
+	asm volatile ("mov %0, %%cr4" :: "r"(cr4));
+	fpu_set_cw(0x37F);
+}

kernel/src/sys/arch/x86_64/fpu.h

@@ -0,0 +1,6 @@
+#pragma once
+
+#include <stdint.h>
+
+void fpu_set_cw(const uint16_t cw);
+void fpu_activate();

kernel/src/sys/gfx/flanterm/.gitignore

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

kernel/src/sys/gfx/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/src/sys/gfx/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/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 `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/src/sys/gfx/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/src/sys/gfx/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/src/sys/gfx/flanterm/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/src/sys/gfx/flanterm/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/src/sys/log.c

@@ -1,11 +1,16 @@
 #include "rt.h"
 #include "sys/arch/x86_64/io.h"
+#include "sys/gfx/flanterm/flanterm.h"
 #include <stdarg.h>
 #include <sys/printf.h>
 
+extern struct flanterm_context *ft_ctx;
+
 void log(char *format, ...) {
     // TODO: replace this call with a call to printf() when the RTC is implemented.
-    rt_print("1970-01-01 00:00:00 | ");
+    char *date = "1970-01-01 00:00:00 | ";
+    int i2 = 0; for (i2; date[i2] != 0; i2++);;
+    flanterm_write(ft_ctx, date, i2);
 
     char buf[2048];
     va_list l;
@@ -13,9 +18,9 @@ void log(char *format, ...) {
     npf_vsnprintf(buf, 2048, format, l);
     va_end(l);
 
-    rt_print(buf);
+    int i = 0; for (i; buf[i] != 0; i++);;
+    flanterm_write(ft_ctx, buf, i);
 
-    char *date = "1970-01-01 00:00:00 | ";
     for (int i=0;;i++) {
         if (date[i] == '\0')
             break;

kernel/src/sys/printf.c

@@ -1,6 +1,7 @@
 // Copyright (C) 2024 Sipaa Projects
 // This code is part of the Soaplin kernel and is licensed under the terms of
 // the MIT License.
+#include "sys/gfx/flanterm/flanterm.h"
 #include <rt.h>
 #include <stdarg.h>
 
@@ -15,6 +16,8 @@
 #define NANOPRINTF_IMPLEMENTATION
 #include <sys/printf.h>
 
+extern struct flanterm_context *ft_ctx;
+
 void printf(char *format, ...) {
     char buf[2048];
     va_list lst;
@@ -22,5 +25,7 @@ void printf(char *format, ...) {
     npf_vsnprintf(buf, 2048, format, lst);
     va_end(lst);
 
-    rt_print(buf);
+    //rt_print(buf);
+    int i = 0; for (i; buf[i] != 0; i++);;
+    flanterm_write(ft_ctx, buf, i);
 }