initial commit

currently with:
booted via multiboot 1
protected mode to long mode boostrap code
vga used for outputting
gdt and idt set up
identity paging for the whole memory reported by multiboot
pic and ps/2 set up
acpi code exists but is broken

10 files changed, 445 insertions, 0 deletions

diff --git a/include/acpi.h b/include/acpi.h
new file mode 100644
index 0000000..1c68ef4
--- /dev/null
+++ b/include/acpi.h
@@ -0,0 +1,143 @@
+#ifndef _ACPI_H_
+#define _ACPI_H_
+
+#include <stdint.h>
+#include <stddef.h>
+
+struct rsdp {
+ char signature[8];
+ uint8_t checksum;
+ char oemid[6];
+ uint8_t revision;
+ uint32_t rsdt_address;
+} __attribute__((packed));
+
+struct xsdp {
+ char signature[8];
+ uint8_t checksum;
+ char oemid[6];
+ uint8_t revision;
+ uint32_t rsdt_address; // deprecated since version 2.0
+
+ uint32_t length;
+ uint64_t xsdt_address;
+ uint8_t extended_checksum;
+ uint8_t reserved[3];
+} __attribute__((packed));
+
+struct acpi_sdt_header {
+	char signature[4];
+	uint32_t len;
+	uint8_t rev;
+	uint8_t checksum;
+	char oemid[6];
+	char oem_tableid[8];
+	uint32_t oem_revision;
+	uint32_t creatorid;
+	uint32_t creator_rev;
+} __attribute__((packed));
+
+struct rsdt {
+	struct acpi_sdt_header header;
+	uint32_t sdt_pointers[];
+} __attribute__((packed));
+
+struct xsdt {
+	struct acpi_sdt_header header;
+	uint64_t sdt_pointers[];
+} __attribute__((packed));
+
+struct generic_address {
+	uint8_t address_space;
+	uint8_t bid_width;
+	uint8_t bit_offset;
+	uint8_t access_size;
+	uint64_t address;
+} __attribute__((packed));
+
+struct fadt {
+	struct acpi_sdt_header header;
+	uint32_t firmware_ctrl;
+	uint32_t dsdt;
+
+	uint8_t reserved;
+
+	uint8_t prevered_power_management_profile;
+	uint16_t sci_interrupt;
+	uint32_t smi_command_port;
+	uint8_t acpi_enable;
+	uint8_t acpi_disable;
+	uint8_t s4_bios_req;
+	uint8_t pstate_control;
+
+	uint32_t pm1a_event_block;
+	uint32_t pm1b_event_block;
+
+	uint32_t pm1a_control_block;
+	uint32_t pm1b_control_block;
+
+	uint32_t pm2_control_block;
+
+	uint32_t pm_timer_block;
+
+	uint32_t gpe0_block;
+	uint32_t gpe1_block;
+
+	uint8_t pm1_event_length;
+	uint8_t pm1_control_length;
+	uint8_t pm2_control_length;
+	uint8_t pm_timer_length;
+
+	uint8_t gpe0_length;
+	uint8_t gpe1_length;
+	uint8_t gpe1_base;
+
+	uint8_t cstate_control;
+	
+	uint16_t worst_c2_latency;
+	uint16_t worst_c3_latency;
+
+	uint16_t flush_size;
+	uint16_t flush_stride;
+
+	uint8_t duty_offset;
+	uint8_t duty_width;
+
+	uint8_t day_alarm;
+	uint8_t month_alarm;
+	uint8_t century;
+
+	uint16_t boot_arch_flags;
+
+	uint8_t reserved_2;
+	uint32_t flags;
+
+	struct generic_address reset_reg;
+
+	uint8_t reset_valued;
+	uint8_t reserved_3[3];
+
+	uint64_t x_firmware_control;
+	uint64_t x_dsdt;
+
+	struct generic_address x_pm1a_event_block;
+	struct generic_address x_pm1b_event_block;
+	struct generic_address x_pm1a_control_block;
+	struct generic_address x_pm1b_control_block;
+	struct generic_address x_pm2_control_block;
+	struct generic_address x_pm_timer_block;
+	struct generic_address x_gpe0_block;
+	struct generic_address x_gpe1_block;
+} __attribute__((packed));
+
+struct xsdp *find_rsdp();
+struct fadt *find_facp(struct xsdt *root_sdt);
+void print_rsdp(const struct rsdp *rsdp);
+
+static inline struct xsdt *get_rsdt(struct xsdp *rsdp) {
+	if (rsdp == NULL || rsdp->revision == 0)
+		return NULL;
+	return (struct xsdt *) rsdp->xsdt_address;
+}
+
+#endif
diff --git a/include/gdt.h b/include/gdt.h
new file mode 100644
index 0000000..63ff08b
--- /dev/null
+++ b/include/gdt.h
@@ -0,0 +1,10 @@
+#ifndef _GDT_H_
+#define _GDT_H_
+
+#include <stdint.h>
+#include <stddef.h>
+
+void gdt_set_gate(size_t num, uint64_t base, uint32_t limit, uint8_t access, uint8_t gran);
+void gdt_install();
+
+#endif
diff --git a/include/idt.h b/include/idt.h
new file mode 100644
index 0000000..587419b
--- /dev/null
+++ b/include/idt.h
@@ -0,0 +1,17 @@
+#ifndef _IDT_H_
+#define _IDT_H_
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+void idt_set_isr(uint8_t num, uint64_t offset, uint16_t sel, uint8_t flags);
+void idt_init();
+
+extern uint64_t isr_table[32];
+
+
+bool idt_register_isr(size_t num, void (*func)(uint64_t, uint64_t));
+bool idt_remove_isr(size_t num, void (*func)(uint64_t, uint64_t));
+
+#endif
diff --git a/include/mem.h b/include/mem.h
new file mode 100644
index 0000000..ee68165
--- /dev/null
+++ b/include/mem.h
@@ -0,0 +1,11 @@
+#ifndef _MEM_H_
+#define _MEM_H_
+
+#include <stddef.h>
+
+void *memcpy(void *restrict dest, const void *restrict src, size_t n);
+void *memmove(void *dest, const void *src, size_t n);
+void *memset(void *s, int c, size_t n);
+int memcmp(const void *s1, const void *s2, size_t n);
+
+#endif
diff --git a/include/memory.h b/include/memory.h
new file mode 100644
index 0000000..b349e62
--- /dev/null
+++ b/include/memory.h
@@ -0,0 +1,13 @@
+#ifndef _PAGE_H_
+#define _PAGE_H_
+
+#include <stddef.h>
+#include <stdbool.h>
+
+void *kmalloc(size_t size);
+void *kmalloc_a(size_t size, size_t alignment);
+void kfree(void *ptr);
+void print_blocks();
+bool paging_init();
+
+#endif
diff --git a/include/multiboot.h b/include/multiboot.h
new file mode 100644
index 0000000..d2be87b
--- /dev/null
+++ b/include/multiboot.h
@@ -0,0 +1,173 @@
+#ifndef _MULTIBOOT_H_
+#define _MULTIBOOT_H_
+
+#include <stdint.h>
+
+struct multiboot_header
+{
+  uint32_t magic;
+
+  uint32_t flags;
+
+  /* The above fields plus this one must equal 0 mod 2^32. */
+  uint32_t checksum;
+
+  /* These are only valid if MULTIBOOT_AOUT_KLUDGE is set. */
+  uint32_t header_addr;
+  uint32_t load_addr;
+  uint32_t load_end_addr;
+  uint32_t bss_end_addr;
+  uint32_t entry_addr;
+
+  /* These are only valid if MULTIBOOT_VIDEO_MODE is set. */
+  uint32_t mode_type;
+  uint32_t width;
+  uint32_t height;
+  uint32_t depth;
+};
+
+/* The symbol table for a.out. */
+struct multiboot_aout_symbol_table
+{
+  uint32_t tabsize;
+  uint32_t strsize;
+  uint32_t addr;
+  uint32_t reserved;
+};
+
+/* The section header table for ELF. */
+struct multiboot_elf_section_header_table
+{
+  uint32_t num;
+  uint32_t size;
+  uint32_t addr;
+  uint32_t shndx;
+};
+
+struct multiboot_info
+{
+  /* Multiboot info version number */
+  uint32_t flags;
+
+  /* Available memory from BIOS */
+  uint32_t mem_lower;
+  uint32_t mem_upper;
+
+  /* "root" partition */
+  uint32_t boot_device;
+
+  /* Kernel command line */
+  uint32_t cmdline;
+
+  /* Boot-Module list */
+  uint32_t mods_count;
+  uint32_t mods_addr;
+
+  union
+  {
+    struct multiboot_aout_symbol_table aout_sym;
+    struct multiboot_elf_section_header_table elf_sec;
+  } u;
+
+  /* Memory Mapping buffer */
+  uint32_t mmap_length;
+  uint32_t mmap_addr;
+
+  /* Drive Info buffer */
+  uint32_t drives_length;
+  uint32_t drives_addr;
+
+  /* ROM configuration table */
+  uint32_t config_table;
+
+  /* Boot Loader Name */
+  uint32_t boot_loader_name;
+
+  /* APM table */
+  uint32_t apm_table;
+
+  /* Video */
+  uint32_t vbe_control_info;
+  uint32_t vbe_mode_info;
+  uint16_t vbe_mode;
+  uint16_t vbe_interface_seg;
+  uint16_t vbe_interface_off;
+  uint16_t vbe_interface_len;
+
+  uint64_t framebuffer_addr;
+  uint32_t framebuffer_pitch;
+  uint32_t framebuffer_width;
+  uint32_t framebuffer_height;
+  uint8_t framebuffer_bpp;
+#define MULTIBOOT_FRAMEBUFFER_TYPE_INDEXED 0
+#define MULTIBOOT_FRAMEBUFFER_TYPE_RGB     1
+#define MULTIBOOT_FRAMEBUFFER_TYPE_EGA_TEXT     2
+  uint8_t framebuffer_type;
+  union
+  {
+    struct
+    {
+      uint32_t framebuffer_palette_addr;
+      uint16_t framebuffer_palette_num_colors;
+    };
+    struct
+    {
+      uint8_t framebuffer_red_field_position;
+      uint8_t framebuffer_red_mask_size;
+      uint8_t framebuffer_green_field_position;
+      uint8_t framebuffer_green_mask_size;
+      uint8_t framebuffer_blue_field_position;
+      uint8_t framebuffer_blue_mask_size;
+    };
+  };
+};
+
+struct multiboot_color
+{
+  uint8_t red;
+  uint8_t green;
+  uint8_t blue;
+};
+
+struct multiboot_mmap_entry
+{
+  uint32_t size;
+  uint64_t addr;
+  uint64_t len;
+#define MULTIBOOT_MEMORY_AVAILABLE              1
+#define MULTIBOOT_MEMORY_RESERVED               2
+#define MULTIBOOT_MEMORY_ACPI_RECLAIMABLE       3
+#define MULTIBOOT_MEMORY_NVS                    4
+#define MULTIBOOT_MEMORY_BADRAM                 5
+  uint32_t type;
+} __attribute__((packed));
+
+struct multiboot_mod_list
+{
+  /* the memory used goes from bytes ’mod_start’ to ’mod_end-1’ inclusive */
+  uint32_t mod_start;
+  uint32_t mod_end;
+
+  /* Module command line */
+  uint32_t cmdline;
+
+  /* padding to take it to 16 bytes (must be zero) */
+  uint32_t pad;
+};
+
+/* APM BIOS info. */
+struct multiboot_apm_info
+{
+  uint16_t version;
+  uint16_t cseg;
+  uint32_t offset;
+  uint16_t cseg_16;
+  uint16_t dseg;
+  uint16_t flags;
+  uint16_t cseg_len;
+  uint16_t cseg_16_len;
+  uint16_t dseg_len;
+};
+
+#endif
+
diff --git a/include/nrvn.h b/include/nrvn.h
new file mode 100644
index 0000000..abb03b4
--- /dev/null
+++ b/include/nrvn.h
@@ -0,0 +1,22 @@
+#ifndef _NRVN_H_
+#define _NRVN_H_
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+static inline void outb(uint16_t port, uint8_t val) {
+	asm volatile ("outb %0, %1" : : "a"(val), "Nd"(port) : "memory");
+}
+
+static inline uint8_t inb(uint16_t port) {
+	uint8_t ret;
+	asm volatile ("inb %1, %0" : "=a"(ret) : "Nd"(port) : "memory");
+	return ret;
+}
+
+static inline void io_wait(void) {
+    outb(0x80, 0);
+}
+
+#endif
diff --git a/include/pic.h b/include/pic.h
new file mode 100644
index 0000000..08ec6e7
--- /dev/null
+++ b/include/pic.h
@@ -0,0 +1,9 @@
+#ifndef _PIC_H_
+#define _PIC_H_
+
+#include <stdint.h>
+
+void pic_init(void);
+void pic_eoi(uint8_t irq);
+
+#endif
diff --git a/include/ps2.h b/include/ps2.h
new file mode 100644
index 0000000..29c1f09
--- /dev/null
+++ b/include/ps2.h
@@ -0,0 +1,9 @@
+#ifndef _PS2_H_
+#define _PS2_H_
+
+#include <stdbool.h>
+#include <acpi.h>
+
+bool ps2_init(struct fadt *fadt);
+
+#endif
diff --git a/include/vga.h b/include/vga.h
new file mode 100644
index 0000000..6d74671
--- /dev/null
+++ b/include/vga.h
@@ -0,0 +1,38 @@
+#ifndef _VGA_H_
+#define _VGA_H_
+
+#include <stdint.h>
+#include <stddef.h>
+
+/* Hardware text mode color constants. */
+enum vga_color {
+	VGA_BLACK = 0,
+	VGA_BLUE = 1,
+	VGA_GREEN = 2,
+	VGA_CYAN = 3,
+	VGA_RED = 4,
+	VGA_MAGENTA = 5,
+	VGA_BROWN = 6,
+	VGA_LIGHT_GREY = 7,
+	VGA_DARK_GREY = 8,
+	VGA_LIGHT_BLUE = 9,
+	VGA_LIGHT_GREEN = 10,
+	VGA_LIGHT_CYAN = 11,
+	VGA_LIGHT_RED = 12,
+	VGA_LIGHT_MAGENTA = 13,
+	VGA_LIGHT_BROWN = 14,
+	VGA_WHITE = 15,
+};
+
+static const size_t VGA_WIDTH = 80;
+static const size_t VGA_HEIGHT = 25;
+
+void vga_init(void);
+void vga_putn(const size_t num);
+void vga_putx(const size_t hex);
+void vga_putc(const char c);
+void vga_puts(const char *s);
+void vga_putsn(const char *s, const size_t len);
+void vga_set_color(const uint8_t fg, const uint8_t bg);
+
+#endif