Add driver for frame buffer.

And make me an image please!

bin/build

@@ -1,7 +1,15 @@
 #!/bin/sh
 
 cd src/lib/c
+make clean
 make
 cd ../..
+
 cd kernel
+make clean
+
+cd driver/bcm2835
+make
+
+cd ../..
 make

src/kernel/Makefile

@@ -17,8 +17,8 @@ $(BUILD)/kernel.img.asm: $(BUILD)/kernel.img
 $(BUILD)/kernel.listing: $(BUILD)/kernel.elf
 	$(COMPILER_PREFIX)-objdump -d $< > $(BUILD)/kernel.listing
 
-$(BUILD)/kernel.elf: $(BUILD) Makefile kernel.ld $(BUILD)/bootstrap.o $(BUILD)/main.o $(BUILD)/driver/bcm2835/gpio $(BUILD)/driver/bcm2835/gpio/gpio.o $(BUILD)/driver/bcm2835/uart $(BUILD)/driver/bcm2835/uart/uart.o 
-	$(LINK) -o $(BUILD)/kernel.elf -T kernel.ld $(BUILD)/bootstrap.o $(BUILD)/main.o $(BUILD)/driver/bcm2835/gpio/gpio.o $(BUILD)/driver/bcm2835/uart/uart.o $(BUILD_PREFIX)/lib/c.o
+$(BUILD)/kernel.elf: $(BUILD) Makefile kernel.ld $(BUILD)/bootstrap.o $(BUILD)/main.o
+	$(LINK) -o $(BUILD)/kernel.elf -T kernel.ld $(BUILD)/bootstrap.o $(BUILD)/main.o $(BUILD)/driver/bcm2835.o $(BUILD_PREFIX)/lib/c.o
 
 $(BUILD)/%.o: %.s
 	$(CC) -o $@ $<

src/kernel/driver/bcm2835/Makefile

@@ -0,0 +1,19 @@
+TOOLCHAIN = ../../../../bin/toolchain/bin
+COMPILER_PREFIX = $(TOOLCHAIN)/arm-none-eabi
+CC = $(COMPILER_PREFIX)-gcc --std=gnu11 -I ../../../../include/libc -g -c
+PACK = $(COMPILER_PREFIX)-ar rs
+BUILD_PREFIX = ../../../../build/idaeus/kernel/driver
+BUILD = $(BUILD_PREFIX)/bcm2835
+VPATH = framebuffer gpio mailbox uart
+
+$(BUILD_PREFIX)/bcm2835.o: $(BUILD)/framebuffer/framebuffer.o $(BUILD)/gpio/gpio.o $(BUILD)/mailbox/mailbox.o $(BUILD)/uart/uart.o
+	$(PACK) $(BUILD_PREFIX)/bcm2835.o $^
+
+$(BUILD)/%.o: %.c $(dir $@)
+	mkdir -p $(dir $@)
+	$(CC) -o $@ $<
+
+
+clean:
+	rm -rf $(BUILD)
+	rm -f $(BUILD_PREFIX)/bcm2835.o

src/kernel/driver/bcm2835/framebuffer/framebuffer.c

@@ -0,0 +1,34 @@
+#include "framebuffer.h"
+#include "../mailbox/mailbox.h"
+
+#include <stdio.h>
+
+int framebuffer_init(frame_buffer_info_t* frame_buffer_info, uint32_t width, uint32_t height, uint32_t depth) {
+	frame_buffer_info->physical_width = 1024;
+	frame_buffer_info->physical_height = 768;
+	frame_buffer_info->virtual_width = 1024;
+	frame_buffer_info->virtual_height = 768;
+	frame_buffer_info->gpu_pitch = 0;
+	frame_buffer_info->bit_depth = 16;
+	frame_buffer_info->x = 0;
+	frame_buffer_info->y = 0;
+	frame_buffer_info->gpu_pointer = 0;
+	frame_buffer_info->gpu_size = 0;
+
+	mailbox_write(1, frame_buffer_info);
+
+	/*
+	 * Check status
+	 */
+	int status;
+
+	if (mailbox_read(1, &status) != 0) {
+		puts("[ERORR] framebuffer_init: failed to read form mail box.");
+		return -1;
+	} else if (status != 0) {
+		puts("[ERORR] framebuffer_init: failed to set up.");
+		return -2;
+	}
+
+	return 0;
+}

src/kernel/driver/bcm2835/framebuffer/framebuffer.h

@@ -0,0 +1,21 @@
+#ifndef KERNEL_DRIVER_BCM2835_FRAMEBUFFER_FRAMEBUFFER_H
+#define KERNEL_DRIVER_BCM2835_FRAMEBUFFER_FRAMEBUFFER_H
+
+#include <stdint.h>
+
+typedef struct {
+	uint32_t physical_width;
+	uint32_t physical_height;
+	uint32_t virtual_width;
+	uint32_t virtual_height;
+	uint32_t gpu_pitch;
+	uint32_t bit_depth;
+	uint32_t x;
+	uint32_t y;
+	uint32_t gpu_pointer;
+	uint32_t gpu_size;
+} __attribute__((packed)) frame_buffer_info_t;
+
+int framebuffer_init(frame_buffer_info_t* frame_buffer_info, uint32_t width, uint32_t height, uint32_t depth);
+
+#endif

src/kernel/driver/bcm2835/mailbox/mailbox.c

@@ -0,0 +1,65 @@
+#include "mailbox.h"
+#include <stdio.h>
+
+/*
+ * Address  | Size | Name          | Description                 | R/W
+ * ---------|------|---------------|-----------------------------|----
+ * 2000B880 |    4 | Read          | Receiving mail.             | R
+ * 2000B890 |    4 | Poll          | Receive without retrieving. | R
+ * 2000B894 |    4 | Sender        | Sender information.         | R
+ * 2000B898 |    4 | Status        | Information.                | R
+ * 2000B89C |    4 | Configuration | Settings.                   | RW
+ * 2000B8A0 |    4 | Write         | Sending mail.               | W
+ */
+
+#define MAILBOX_BASE_ADDRESS 0x2000B880
+const uint32_t MAILBOX_READ_ADDRESS = MAILBOX_BASE_ADDRESS;
+const uint32_t MAILBOX_POLL_ADDRESS = MAILBOX_BASE_ADDRESS + 0x10;
+const uint32_t MAILBOX_SENDER_ADDRESS = MAILBOX_BASE_ADDRESS + 0x14;
+const uint32_t MAILBOX_STATUS_ADDRESS = MAILBOX_BASE_ADDRESS + 0x18;
+const uint32_t MAILBOX_CONFIG_ADDRESS = MAILBOX_BASE_ADDRESS + 0x1C;
+const uint32_t MAILBOX_WRITE_ADDRESS = MAILBOX_BASE_ADDRESS + 0x20;
+
+void mailbox_write(uint8_t mailbox, void* mail) {
+	if ((uint32_t)mail & 0xF != 0) {
+		puts("[ERROR] mailbox_write: pointer not aligned.");
+		return;
+	}
+
+	if (mailbox > 15) {
+		puts("[ERROR] mailbox_write: mailbox > 15.");
+		return;
+	}
+	puts("write");
+	uint32_t* write = (uint32_t*)MAILBOX_WRITE_ADDRESS;
+	uint32_t* status = (uint32_t*)MAILBOX_STATUS_ADDRESS;
+	mail += 0x40000000 + mailbox;
+
+	while (*status & 0x80000000 == 0) {
+
+	}
+
+	*write = mail;
+
+}
+
+int mailbox_read(uint8_t mailbox, uint32_t* mail) {
+	if (mailbox > 15) {
+		puts("[ERROR] mailbox_write: mailbox > 15.");
+		return -1;
+	}
+
+	uint32_t* read = (uint32_t*)MAILBOX_READ_ADDRESS;
+	uint32_t* status = (uint32_t*)MAILBOX_STATUS_ADDRESS;
+
+	//do {
+		//while ((*status & 0x40000000) == 0) {
+
+		//}
+
+		*mail = *read;
+	//} while ((*mail & 0xF) != mailbox);
+
+	*mail &= 0xFFFFFFF0;
+	return 0;
+}

src/kernel/driver/bcm2835/mailbox/mailbox.h

@@ -0,0 +1,9 @@
+#ifndef KERNEL_DRIVER_BCM2835_MAILBOX_MAILBOX_H
+#define KERNEL_DRIVER_BCM2835_MAILBOX_MAILBOX_H
+
+#include <stdint.h>
+
+void mailbox_write(uint8_t mailbox, void* mail);
+int mailbox_read(uint8_t mailbox, uint32_t* mail);
+
+#endif

src/kernel/main.c

@@ -1,8 +1,26 @@
 #include <stdio.h>
 #include "driver/bcm2835/uart/uart.h"
+#include "driver/bcm2835/framebuffer/framebuffer.h"
+
+
 
 void main(void) {
 	uart_init();
 	libc_init_putc(uart_putc);
-	puts("Hello World!");
+	puts("framebuffer init");
+	frame_buffer_info_t frame_buffer_info;
+	framebuffer_init(&frame_buffer_info, 1024, 768, 16);
+	puts("draw");
+
+	uint16_t* img = frame_buffer_info.gpu_pointer;
+	uint16_t color = 0;
+
+	for (uint32_t x = 0; x < frame_buffer_info.physical_width; x++) {
+		for (uint32_t y = 0; y < frame_buffer_info.physical_height; y++) {
+			*img = color++;
+			img += 2;
+		}
+	}
+
+	puts("terminate");
 }