docs: Continue work on Limine protocol spec

PROTOCOL.md

@@ -135,3 +135,387 @@ at least 8KiB (8192 bytes) in size. An invalid return address of 0 is pushed
 to the stack before jumping to the kernel.
 
 All other general purpose registers are set to 0.
+
+# Feature List
+
+Request IDs are composed of 4 64-bit unsigned integers, but the first 2 are
+common to every request:
+```c
+#define LIMINE_COMMON_MAGIC 0xc7b1dd30df4c8b88, 0x0a82e883a194f07b
+```
+
+## Bootloader Info Feature
+
+ID:
+```c
+#define LIMINE_BOOTLOADER_INFO_REQUEST { LIMINE_COMMON_MAGIC, 0xf55038d8e2a1202f, 0x279426fcf5f59740 }
+```
+
+Request:
+```c
+struct limine_bootloader_info_request {
+    uint64_t id[4];
+    uint64_t revision;
+    struct limine_bootloader_info_response *response;
+};
+```
+
+Response:
+```c
+struct limine_bootloader_info_response {
+    uint64_t revision;
+    char *name;
+    char *version;
+};
+```
+
+`name` and `version` are 0-terminated ASCII strings containing the name and
+version of the loading bootloader.
+
+## HHDM (Higher Half Direct Map) Feature
+
+ID:
+```c
+#define LIMINE_HHDM_REQUEST { LIMINE_COMMON_MAGIC, 0x48dcf1cb8ad2b852, 0x63984e959a98244b }
+```
+
+Request:
+```c
+struct limine_hhdm_request {
+    uint64_t id[4];
+    uint64_t revision;
+    struct limine_hhdm_response *response;
+};
+```
+
+Response:
+```c
+struct limine_hhdm_response {
+    uint64_t revision;
+    uint64_t address;
+};
+```
+
+* `address` - the virtual address of the beginning of the higher half direct
+map.
+
+## Framebuffer Feature
+
+ID:
+```c
+#define LIMINE_FRAMEBUFFER_REQUEST { LIMINE_COMMON_MAGIC, 0xcbfe81d7dd2d1977, 0x063150319ebc9b71 }
+```
+
+Request:
+```c
+struct limine_framebuffer_request {
+    uint64_t id[4];
+    uint64_t revision;
+    struct limine_framebuffer_response *response;
+};
+```
+
+Response:
+```c
+struct limine_framebuffer_response {
+    uint64_t revision;
+    uint64_t framebuffer_count;
+    struct limine_framebuffer **framebuffers;
+};
+```
+
+* `framebuffer_count` - How many framebuffers are present.
+* `framebuffers` - Pointer to an array of `framebuffer_count` pointers to
+`struct limine_framebuffer` structures.
+
+```c
+// Constants for `memory_model`
+#define LIMINE_FRAMEBUFFER_RGB 1
+
+struct limine_framebuffer {
+    void *address;
+    uint16_t width;
+    uint16_t height;
+    uint16_t pitch;
+    uint16_t bpp;
+    uint8_t memory_model;
+    uint8_t red_mask_size;
+    uint8_t red_mask_shift;
+    uint8_t green_mask_size;
+    uint8_t green_mask_shift;
+    uint8_t blue_mask_size;
+    uint8_t blue_mask_shift;
+    uint8_t unused;
+    uint64_t edid_size;
+    void *edid;
+};
+```
+
+## 5-Level Paging Feature
+
+ID:
+```c
+#define LIMINE_5_LEVEL_PAGING_REQUEST { LIMINE_COMMON_MAGIC, 0x94469551da9b3192, 0xebe5e86db7382888 }
+```
+
+Request:
+```c
+struct limine_5_level_paging_request {
+    uint64_t id[4];
+    uint64_t revision;
+    struct limine_5_level_paging_response *response;
+};
+```
+
+Response:
+```c
+struct limine_5_level_paging_response {
+    uint64_t revision;
+};
+```
+
+Notes: The presence of this request will prompt the bootloader to turn on
+x86_64 5-level paging. It will not be turned on if this request is not present.
+If the response pointer is non-NULL, 5-level paging is engaged.
+
+## Entry Point Feature
+
+ID:
+```c
+#define LIMINE_ENTRY_POINT_REQUEST { LIMINE_COMMON_MAGIC, 0x13d86c035a1cd3e1, 0x2b0caa89d8f3026a }
+```
+
+Request:
+```c
+typedef void (*limine_entry_point)(void);
+
+struct limine_entry_point_request {
+    uint64_t id[4];
+    uint64_t revision;
+    struct limine_entry_point_response *response;
+    limine_entry_point entry;
+};
+```
+
+* `entry` - The requested entry point.
+
+Response:
+```c
+struct limine_entry_point_response {
+    uint64_t revision;
+};
+```
+
+## RSDP Feature
+
+ID:
+```c
+#define LIMINE_RSDP_REQUEST { LIMINE_COMMON_MAGIC, 0xc5e77b6b397e7b43, 0x27637845accdcf3c }
+```
+
+Request:
+```c
+struct limine_rsdp_request {
+    uint64_t id[4];
+    uint64_t revision;
+    struct limine_rsdp_response *response;
+};
+```
+
+Response:
+```c
+struct limine_rsdp_response {
+    uint64_t revision;
+    void *address;
+};
+```
+
+* `address` - Address of the RSDP table.
+
+## SMBIOS Feature
+
+ID:
+```c
+#define LIMINE_SMBIOS_REQUEST { LIMINE_COMMON_MAGIC, 0x9e9046f11e095391, 0xaa4a520fefbde5ee }
+```
+
+Request:
+```c
+struct limine_smbios_request {
+    uint64_t id[4];
+    uint64_t revision;
+    struct limine_smbios_response *response;
+};
+```
+
+Response:
+```c
+struct limine_smbios_response {
+    uint64_t revision;
+    void *entry_32;
+    void *entry_64;
+};
+```
+
+* `entry_32` - Address of the 32-bit SMBIOS entry point. NULL if not present.
+* `entry_64` - Address of the 64-bit SMBIOS entry point. NULL if not present.
+
+## EFI System Table Feature
+
+ID:
+```c
+#define LIMINE_EFI_SYSTEM_TABLE_REQUEST { LIMINE_COMMON_MAGIC, 0x5ceba5163eaaf6d6, 0x0a6981610cf65fcc }
+```
+
+Request:
+```c
+struct limine_efi_system_table_request {
+    uint64_t id[4];
+    uint64_t revision;
+    struct limine_efi_system_table_response *response;
+};
+```
+
+Response:
+```c
+struct limine_efi_system_table_response {
+    uint64_t revision;
+    void *address;
+};
+```
+
+* `address` - Address of EFI system table.
+
+## Boot Time Feature
+
+ID:
+```c
+#define LIMINE_BOOT_TIME_REQUEST { LIMINE_COMMON_MAGIC, 0x502746e184c088aa, 0xfbc5ec83e6327893 }
+```
+
+Request:
+```c
+struct limine_boot_time_request {
+    uint64_t id[4];
+    uint64_t revision;
+    struct limine_boot_time_response *response;
+};
+```
+
+Response:
+```c
+struct limine_boot_time_response {
+    uint64_t revision;
+    int64_t boot_time;
+};
+```
+
+* `boot_time` - The UNIX time on boot, in seconds, taken from the system RTC.
+
+## Kernel Address Feature
+
+ID:
+```c
+#define LIMINE_KERNEL_ADDRESS_REQUEST { LIMINE_COMMON_MAGIC, 0x71ba76863cc55f63, 0xb2644a48c516a487 }
+```
+
+Request:
+```c
+struct limine_kernel_address_request {
+    uint64_t id[4];
+    uint64_t revision;
+    struct limine_kernel_address_response *response;
+};
+```
+
+Response:
+```c
+struct limine_kernel_address_response {
+    uint64_t revision;
+    uint64_t physical_base;
+    uint64_t virtual_base;
+};
+```
+
+* `physical_base` - The physical base address of the kernel.
+* `virtual_base` - The virtual base address of the kernel.
+
+## Module Feature
+
+ID:
+```c
+#define LIMINE_MODULE_REQUEST { LIMINE_COMMON_MAGIC, 0x3e7e279702be32af, 0xca1c4f3bd1280cee }
+```
+
+Request:
+```c
+struct limine_module_request {
+    uint64_t id[4];
+    uint64_t revision;
+    struct limine_module_response *response;
+};
+```
+
+Response:
+```c
+struct limine_module_response {
+    uint64_t revision;
+    uint64_t module_count;
+    struct limine_module **modules;
+};
+```
+
+* `module_count` - How many modules are present.
+* `modules` - Pointer to an array of `module_count` pointers to
+`struct limine_module` structures.
+
+```c
+struct limine_module {
+    uint64_t base;
+    uint64_t length;
+    char *path;
+    char *cmdline;
+    struct limine_file_location *file_location;
+};
+```
+
+* `base` - The address of the module.
+* `length` - The size of the module.
+* `path` - The bootloader-specific path of the module.
+* `cmdline` - A command line associated with the module.
+* `file_location` - A pointer to the file location structure for the module.
+
+### File Location Structure
+
+```c
+struct limine_uuid {
+    uint32_t a;
+    uint16_t b;
+    uint16_t c;
+    uint8_t d[8];
+};
+
+struct limine_file_location {
+    uint64_t revision;
+    uint64_t partition_index;
+    uint32_t tftp_ip;
+    uint32_t tftp_port;
+    uint32_t mbr_disk_id;
+    struct limine_uuid gpt_disk_uuid;
+    struct limine_uuid gpt_part_uuid;
+    struct limine_uuid part_uuid;
+};
+```
+
+* `partition_index` - 1-based partition index of the volume from which the
+module was loaded. If 0, it means invalid or unpartitioned.
+* `tftp_ip` - If non-0, this is the IP of the TFTP server the file was loaded from.
+* `tftp_port` - Likewise, but port.
+* `mbr_disk_id` - If non-0, this is the ID of the disk the module was loaded
+from as reported in its MBR.
+* `gpt_disk_uuid` - If non-0, this is the UUID of the disk the module was
+loaded from as reported in its GPT.
+* `gpt_part_uuid` - If non-0, this is the UUID of the partition the module
+was loaded from as reported in the GPT.
+* `part_uuid` - If non-0, this is the UUID of the filesystem of the partition
+the module was loaded from.

common/limine.h

@@ -23,8 +23,8 @@ struct limine_uuid {
 struct limine_file_location {
     uint64_t revision;
     uint64_t partition_index;
-    uint32_t pxe_ip;
+    uint32_t tftp_ip;
-    uint32_t pxe_port;
+    uint32_t tftp_port;
     uint32_t mbr_disk_id;
     struct limine_uuid gpt_disk_uuid;
     struct limine_uuid gpt_part_uuid;

common/protos/limine.c

@@ -43,8 +43,8 @@ static struct limine_file_location get_file_loc(struct file_handle *file) {
     struct limine_file_location ret = {0};
 
     if (file->pxe) {
-        ret.pxe_ip = file->pxe_ip;
+        ret.tftp_ip = file->pxe_ip;
-        ret.pxe_port = file->pxe_port;
+        ret.tftp_port = file->pxe_port;
         return ret;
     }
 

test/limine.c

@@ -98,12 +98,12 @@ static char *get_memmap_type(uint64_t type) {
 static void print_file_loc(struct limine_file_location *file_location) {
     e9_printf("Loc->Revision: %d", file_location->revision);
     e9_printf("Loc->PartIndex: %d", file_location->partition_index);
-    e9_printf("Loc->PXEIP: %d.%d.%d.%d",
+    e9_printf("Loc->TFTPIP: %d.%d.%d.%d",
-              (file_location->pxe_ip & (0xff << 0)) >> 0,
+              (file_location->tftp_ip & (0xff << 0)) >> 0,
-              (file_location->pxe_ip & (0xff << 8)) >> 8,
+              (file_location->tftp_ip & (0xff << 8)) >> 8,
-              (file_location->pxe_ip & (0xff << 16)) >> 16,
+              (file_location->tftp_ip & (0xff << 16)) >> 16,
-              (file_location->pxe_ip & (0xff << 24)) >> 24);
+              (file_location->tftp_ip & (0xff << 24)) >> 24);
-    e9_printf("Loc->PXEPort: %d", file_location->pxe_port);
+    e9_printf("Loc->TFTPPort: %d", file_location->tftp_port);
     e9_printf("Loc->MBRDiskId: %x", file_location->mbr_disk_id);
     e9_printf("Loc->GPTDiskUUID: %x-%x-%x-%x",
               file_location->gpt_disk_uuid.a,