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authorDanny Holman <dholman@gymli.org>2023-11-26 18:47:59 -0600
committerDanny Holman <dholman@gymli.org>2023-11-26 18:47:59 -0600
commit40cbd20b997c2cbcacb2095e7487609bca1c0040 (patch)
tree9f3adfbdf4c277e8cec29d19aa69a73eff36cc2b /arch/i386/include
parent0c34fb36ab9f3df876412382ef62056409e9f98d (diff)
arch: i386: add multiboot support
Add support for the multiboot specification. These files will allow the kernel to read the multiboot header information as well as the provided memory map. Signed-off-by: Danny Holman <dholman@gymli.org>
Diffstat (limited to 'arch/i386/include')
-rw-r--r--arch/i386/include/kernel/multiboot.h104
1 files changed, 104 insertions, 0 deletions
diff --git a/arch/i386/include/kernel/multiboot.h b/arch/i386/include/kernel/multiboot.h
new file mode 100644
index 0000000..5825816
--- /dev/null
+++ b/arch/i386/include/kernel/multiboot.h
@@ -0,0 +1,104 @@
+#ifndef I386_MULTIBOOT_H
+#define I386_MULTIBOOT_H
+
+#include <stdint.h>
+
+#define MBOOT_HEADER_MAGIC 0x1BADB002
+#define MBOOT_LOADER_MAGIC 0x2BADB002
+
+// Multiboot flags
+#define MBOOT_INFO_MMAP 0x00000001
+#define MBOOT_INFO_BOOTDEV 0x00000002
+#define MBOOT_INFO_CMDLINE 0x00000004
+#define MBOOT_INFO_MODS 0x00000008
+#define MBOOT_INFO_AOUT_SYMS 0x00000010
+#define MBOOT_INFO_ELF_HEADER 0x00000020
+#define MBOOT_INFO_MEM_MAP 0x00000040
+#define MBOOT_INFO_DRIVE_INFO 0x00000080
+#define MBOOT_INFO_CONFIG_TBL 0x00000100
+#define MBOOT_INFO_BL_NAME 0x00000200
+#define MBOOT_INFO_APM_TBL 0x00000400
+#define MBOOT_INFO_VBE 0x00000800
+#define MBOOT_INFO_FRAMEBUFFER 0x00001000
+
+// Memory types
+#define MBOOT_MEM_AVAILABLE 1
+#define MBOOT_MEM_RESERVED 2
+#define MBOOT_MEM_ACPI_REC 3
+#define MBOOT_MEM_NVS 4
+#define MBOOT_MEM_BADRAM 5
+
+struct aout_symbol_table {
+ uint32_t tabsize;
+ uint32_t strsize;
+ uint32_t addr;
+ uint32_t reserved;
+};
+
+struct elf_section_header {
+ uint32_t num;
+ uint32_t size;
+ uint32_t addr;
+ uint32_t shndx;
+};
+
+struct mboot_header {
+ uint32_t magic;
+ uint32_t flags;
+ uint32_t checksum;
+ uint32_t header_addr;
+ uint32_t load_addr;
+ uint32_t load_end_addr;
+ uint32_t bss_end_addr;
+ uint32_t entry_addr;
+ uint32_t mode_type;
+ uint32_t width;
+ uint32_t height;
+ uint32_t depth;
+};
+
+struct mboot_info {
+ uint32_t flags;
+ uint32_t mem_lower;
+ uint32_t mem_upper;
+ uint32_t boot_device;
+ uint32_t cmdline;
+ uint32_t mods_count;
+ uint32_t mods_addr;
+ union {
+ struct aout_symbol_table aout_sym;
+ struct elf_section_header elf_sec;
+ } u;
+ uint32_t mmap_length;
+ uint32_t mmap_addr;
+ uint32_t drives_length;
+ uint32_t drives_addr;
+ uint32_t config_table;
+ uint32_t boot_loader_name;
+ uint32_t apm_table;
+ 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;
+ uint8_t framebuffer_type;
+};
+
+struct mboot_mmap_entry {
+ uint32_t size;
+ uint32_t addr_low;
+ uint32_t addr_high;
+ uint32_t len_low;
+ uint32_t len_high;
+ uint32_t type;
+} __attribute__((packed));
+
+void i386_entry(uint32_t mboot_magic, struct mboot_info *header);
+
+#endif