dev: boot framebuffer support

kexts/drivers/video/vesafb/extension.yaml

@@ -1,7 +1,7 @@
-name: vgafb
+name: vesafb
 description: |
-  Generic VGA driver.
-id: net.doorstuck.socks.vgafb
+  Boot-time VESA framebuffer driver.
+id: net.doorstuck.socks.vesafb
 license: BSD-3-Clause
 copyright: Copyright © Max Wash 2023
 sources:

kexts/drivers/video/vesafb/main.c

@@ -0,0 +1,65 @@
+#include <socks/printk.h>
+#include <socks/device.h>
+#include <socks/kext.h>
+#include <socks/machine/init.h>
+#include <socks/libc/stdio.h>
+
+static struct driver *vesa_driver = NULL;
+static struct framebuffer_device *vesafb = NULL;
+
+static kern_status_t set_varinfo(struct device *dev, const struct framebuffer_varinfo *info)
+{
+	return KERN_UNSUPPORTED;
+}
+
+static struct framebuffer_device_ops vesa_ops = {
+	.set_varinfo = set_varinfo,
+};
+
+static void init_vesa(struct framebuffer_device *dev)
+{
+	struct framebuffer_varinfo *varinfo = &dev->fb_varinfo;
+	struct framebuffer_fixedinfo *fixedinfo = &dev->fb_fixedinfo;
+
+	memcpy(varinfo, bootfb_varinfo(), sizeof *varinfo);
+	memcpy(fixedinfo, bootfb_fixedinfo(), sizeof *fixedinfo);
+}
+
+static kern_status_t online(struct kext *self)
+{
+	const struct framebuffer_fixedinfo *fixedinfo = bootfb_fixedinfo();
+	if (!fixedinfo->fb_baseptr) {
+		/* No VESA information avaiable, cannot create device. */
+		return KERN_OK;
+	}
+
+	vesa_driver = driver_create(self, "vesafb");
+	if (!vesa_driver) {
+		return KERN_NO_MEMORY;
+	}
+
+	driver_register(vesa_driver);
+
+	struct framebuffer_device *fb = framebuffer_device_create();
+	fb->fb_ops = &vesa_ops;
+
+	init_vesa(fb);
+
+	struct device *fb_base = framebuffer_device_base(fb);
+	snprintf(fb_base->dev_name, sizeof fb_base->dev_name, "vesafb");
+
+	kern_status_t status = device_register(fb_base, vesa_driver, misc_device());
+	if (status != KERN_OK) {
+		driver_unregister(vesa_driver);
+		driver_destroy(vesa_driver);
+		return status;
+	}
+
+	vesafb = fb;
+
+	return KERN_OK;
+}
+
+DEFINE_KEXT("net.doorstuck.socks.vesafb",
+	    online, NULL,
+	    KEXT_NO_DEPENDENCIES);

kexts/drivers/video/vga16fb/extension.yaml

@@ -1,8 +0,0 @@
-name: vga16fb
-description: |
-  Legacy VGA textmode framebuffer driver.
-id: net.doorstuck.socks.vga16fb
-license: BSD-3-Clause
-copyright: Copyright © Max Wash 2023
-sources:
-  - main.c

kexts/drivers/video/vga16fb/main.c

@@ -1,12 +0,0 @@
-#include <socks/printk.h>
-#include <socks/kext.h>
-
-static kern_status_t online(struct kext *self)
-{
-	printk("vga16fb: online");
-	return KERN_OK;
-}
-
-DEFINE_KEXT("net.doorstuck.socks.vga16fb",
-	    online, NULL,
-	    KEXT_NO_DEPENDENCIES);

kexts/drivers/video/vgafb/main.c

@@ -1,36 +0,0 @@
-#include <socks/printk.h>
-#include <socks/device.h>
-#include <socks/kext.h>
-#include <socks/libc/stdio.h>
-
-static struct driver *vga_driver = NULL;
-static struct framebuffer_device *vgafb = NULL;
-
-static kern_status_t online(struct kext *self)
-{
-	vga_driver = driver_create(self, "vgafb");
-	if (!vga_driver) {
-		return KERN_NO_MEMORY;
-	}
-
-	driver_register(vga_driver);
-
-	struct framebuffer_device *fb = framebuffer_device_create();
-	struct device *fb_base = framebuffer_device_base(fb);
-	snprintf(fb_base->dev_name, sizeof fb_base->dev_name, "vgafb");
-
-	kern_status_t status = device_register(fb_base, vga_driver, misc_device());
-	if (status != KERN_OK) {
-		driver_unregister(vga_driver);
-		driver_destroy(vga_driver);
-		return status;
-	}
-
-	vgafb = fb;
-
-	return KERN_OK;
-}
-
-DEFINE_KEXT("net.doorstuck.socks.vgafb",
-	    online, NULL,
-	    KEXT_NO_DEPENDENCIES);