Record networking and DMA development progress
Add the current OS source tree, build scripts, system image layout, and development notes covering DMA page allocation, e1000 bring-up, net API dispatch, and DHCP work in progress.
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/* DKM Console Framebuffer Driver
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* Stage 1, optional, provides "console".
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* Light-blue background + centered circular loading animation (4-color arc ring).
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*/
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#include <stdint.h>
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/* ---------------------------------------------------------------
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* DKM ABI types
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* --------------------------------------------------------------- */
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#define DKM_DRIVER_MAGIC 0x444B4D31u
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#define DKM_ABI_VERSION 1u
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typedef unsigned char u8;
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typedef unsigned short u16;
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typedef unsigned int u32;
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typedef unsigned long long u64;
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typedef long long i64;
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#define NULL ((void *)0)
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struct dkm_log_api {
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void (*info)(const char *msg);
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void (*warn)(const char *msg);
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void (*error)(const char *msg);
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void (*panic)(const char *msg);
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};
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struct dkm_kernel_api {
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u32 version; u32 size; u64 feature_bits;
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const struct dkm_log_api *log;
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const void *mem, *utsm, *irq, *pci_api, *dma, *vfs, *net, *timer, *drr;
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const void *rsdp_address, *fb_address;
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u64 fb_width, fb_height, fb_pitch; u16 fbpp;
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};
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struct dkm_driver_handle;
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struct dkm_driver_desc {
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u32 magic; u16 abi_version; u16 desc_size;
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const char *name, *version, *vendor;
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u32 driver_class, stage, flags, priority;
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const char *const *depends; u32 depends_count;
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const char *const *provides; u32 provides_count;
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u64 min_kernel_abi, feature_bits, reserved0, reserved1;
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};
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static const char *const g_provides[] = { "console" };
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__attribute__((visibility("default"), used))
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const struct dkm_driver_desc driver_desc = {
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.magic=DKM_DRIVER_MAGIC, .abi_version=DKM_ABI_VERSION,
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.desc_size=sizeof(struct dkm_driver_desc),
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.name="console_fb", .version="0.2.0", .vendor="Deshab",
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.driver_class=5, .stage=1, .flags=0, .priority=0,
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.depends=NULL, .depends_count=0,
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.provides=g_provides, .provides_count=1,
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.min_kernel_abi=1,
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};
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/* ---------------------------------------------------------------
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* Colors
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* --------------------------------------------------------------- */
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static const u32 BG = 0xFFC8E0F0; /* light blue background */
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static const u32 ARC[4] = { 0xFF4488CC, 0xFF2266AA, 0xFF66AAEE, 0xFF88CCFF };
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/* ---------------------------------------------------------------
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* Drawing helpers – all integer arithmetic, no soft-float
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* --------------------------------------------------------------- */
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static u64 fb_w, fb_h, fb_p;
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/* double-buffer sprite for ring area (128×128 = no flicker) */
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#define SPR_SIZE 128
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static u32 g_sprite[SPR_SIZE * SPR_SIZE];
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static void fb_fill(u32 *fb, u64 pitch, u64 w, u64 h, u32 color) {
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for (u64 y = 0; y < h; y++) {
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u32 *line = (u32 *)((u8 *)fb + y * pitch);
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for (u64 x = 0; x < w; x++) line[x] = color;
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}
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}
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/* alpha-blend c2 over c1, alpha 0-255 */
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static u32 blend(u32 c1, u32 c2, u32 a) {
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u32 na = 256 - a;
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u32 r = ((c1 & 0xFF) * na + (c2 & 0xFF) * a) >> 8;
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u32 g = (((c1 >> 8) & 0xFF) * na + ((c2 >> 8) & 0xFF) * a) >> 8;
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u32 b = (((c1 >> 16) & 0xFF) * na + ((c2 >> 16) & 0xFF) * a) >> 8;
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return 0xFF000000 | (b << 16) | (g << 8) | r;
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}
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/* integer sqrt – returns floor(sqrt(v)) */
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static u64 isqrt(u64 v) {
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u64 x = v, y = (x + 1) >> 1;
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while (y < x) { x = y; y = (y + v / y) >> 1; }
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return x;
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}
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/* approximate atan2 in degrees (0=right, CCW). dx,dy = pixel offset from center */
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static i64 approx_angle(i64 dx, i64 dy) {
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if (dx == 0) return dy < 0 ? 90 : 270;
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i64 ax = dx < 0 ? -dx : dx;
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i64 ay = dy < 0 ? -dy : dy;
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i64 a;
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if (ax > ay) {
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a = ay * 45 / ax;
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} else {
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a = 90 - ax * 45 / (ay ? ay : 1);
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}
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/* quadrant correction */
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if (dx >= 0 && dy <= 0) return a; /* Q1 */
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else if (dx < 0 && dy <= 0) return 180 - a; /* Q2 */
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else if (dx < 0 && dy > 0) return 180 + a; /* Q3 */
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else return 360 - a; /* Q4 */
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}
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/* draw one arc segment: rounded caps (6° head/tail), bright mid, comet-tail fade */
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static void arc_segment(u32 *fb, i64 cx, i64 cy, i64 r, i64 start, i64 sweep, u32 color, i64 thk) {
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i64 ro = r + thk, ri = r - thk;
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i64 ri2 = ri * ri, ro2 = (ro + 1) * (ro + 1);
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i64 rnd = 6; /* rounding zone at each end, in degrees */
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for (i64 dy = -ro - 1; dy <= ro + 1; dy++) {
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i64 y = cy + dy;
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if ((u64)y >= fb_h) continue;
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u32 *line = (u32 *)((u8 *)fb + (u64)y * fb_p);
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for (i64 dx = -ro - 1; dx <= ro + 1; dx++) {
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i64 x = cx + dx;
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if ((u64)x >= fb_w) continue;
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i64 d2 = dx * dx + dy * dy;
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if (d2 < ri2 - 2 || d2 > ro2 + 2) continue;
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i64 ang = approx_angle(dx, dy);
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i64 a = ang - start;
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if (a < 0) a += 360;
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if ((u64)a > (u64)sweep) continue;
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/* rounded-cap fade: 0→255 over rnd°, then 255→0 over last rnd° */
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u32 fade;
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if ((u64)a < (u64)rnd) {
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fade = (u32)(a * 255 / rnd);
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} else if ((u64)a > (u64)(sweep - rnd)) {
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fade = (u32)((sweep - a) * 255 / rnd);
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} else {
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fade = 255;
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}
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i64 dist = (i64)isqrt((u64)d2);
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u32 effective = blend(BG, color, fade);
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if (dist >= ri && dist <= ro) {
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line[(u64)x] = effective;
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} else if (dist >= ri - 2 && dist < ri) {
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line[(u64)x] = blend(BG, effective, (u32)((dist - (ri - 2)) * 85));
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} else if (dist > ro && dist <= ro + 2) {
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line[(u64)x] = blend(effective, BG, (u32)((dist - ro) * 85));
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}
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}
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}
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}
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/* filled disc with anti-aliased edge */
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static void fill_disc(u32 *fb, i64 cx, i64 cy, i64 r, u32 color) {
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i64 r2 = r * r, o2 = (r + 1) * (r + 1);
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for (i64 dy = -r - 2; dy <= r + 2; dy++) {
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i64 y = cy + dy;
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if ((u64)y >= fb_h) continue;
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u32 *line = (u32 *)((u8 *)fb + (u64)y * fb_p);
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for (i64 dx = -r - 2; dx <= r + 2; dx++) {
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i64 x = cx + dx;
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if ((u64)x >= fb_w) continue;
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i64 d2 = dx * dx + dy * dy;
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if (d2 <= r2) {
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line[(u64)x] = color;
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} else if (d2 <= o2) {
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u32 a = (u32)((o2 - d2) * 255 / (o2 - r2));
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line[(u64)x] = blend(BG, color, a);
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}
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}
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}
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}
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/* ---------------------------------------------------------------
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* Driver entry
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* --------------------------------------------------------------- */
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__attribute__((visibility("default")))
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int driver_init(const struct dkm_kernel_api *api,
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struct dkm_driver_handle *handle) {
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(void)handle;
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if (!api || !api->log) return -1;
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if (!api->fb_address || !api->fb_width) {
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api->log->warn("[console_fb] no framebuffer");
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return 0;
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}
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api->log->info("[console_fb] boot screen");
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fb_w = api->fb_width; fb_h = api->fb_height; fb_p = api->fb_pitch;
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u32 *fb = (u32 *)api->fb_address;
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i64 cx = (i64)fb_w / 2, cy = (i64)fb_h / 2, r = 48, thk = 4;
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/* light-blue background */
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fb_fill(fb, fb_p, fb_w, fb_h, BG);
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/* animation: 2000 frames × 2° clockwise × ~1ms, no flicker */
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i64 spr_p = SPR_SIZE * 4;
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i64 scx = SPR_SIZE / 2;
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i64 scy = SPR_SIZE / 2;
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i64 frame = 0, base = 0;
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i64 bx = cx - scx; /* screen position of sprite top-left */
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i64 by = cy - scy;
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while (frame < 2000) {
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/* draw into sprite buffer — swap globals to sprite layout */
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u64 save_w = fb_w, save_h = fb_h, save_p = fb_p;
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fb_w = SPR_SIZE; fb_h = SPR_SIZE; fb_p = spr_p;
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fb_fill(g_sprite, spr_p, SPR_SIZE, SPR_SIZE, BG);
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arc_segment(g_sprite, scx, scy, r, base + 0, 82, ARC[0], thk);
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arc_segment(g_sprite, scx, scy, r, base + 90, 82, ARC[1], thk);
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arc_segment(g_sprite, scx, scy, r, base +180, 82, ARC[2], thk);
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arc_segment(g_sprite, scx, scy, r, base +270, 82, ARC[3], thk);
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fill_disc(g_sprite, scx, scy, r - 8, blend(BG, 0xFFD0F0FF, 80));
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/* restore screen globals for blit */
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fb_w = save_w; fb_h = save_h; fb_p = save_p;
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/* blit sprite to screen */
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for (i64 sr = 0; sr < SPR_SIZE; sr++) {
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i64 sy = by + sr;
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if ((u64)sy >= fb_h) continue;
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u32 *dst = (u32 *)((u8 *)fb + (u64)sy * fb_p) + bx;
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u32 *src = &g_sprite[sr * SPR_SIZE];
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for (i64 sc = 0; sc < SPR_SIZE; sc++) {
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i64 sx = bx + sc;
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if ((u64)sx >= fb_w) continue;
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dst[sc] = src[sc];
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}
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}
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for (volatile u32 d = 0; d < 72000; d++) {
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__asm__ volatile ("pause");
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}
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base -= 2;
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if (base < 0) base += 360;
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frame++;
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}
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api->log->info("[console_fb] ready");
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return 0;
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}
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__attribute__((visibility("default")))
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int driver_exit(struct dkm_driver_handle *handle) {
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(void)handle;
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return 0;
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}
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