docs: limine: More documentation work
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PROTOCOL.md
108
PROTOCOL.md
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@ -2,7 +2,7 @@
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The Limine boot protocol is a modern, minimal, fast, and extensible boot
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protocol, with a focus on backwards and forwards compatibility,
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created from the experienced gained by working on the
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created from the experience gained by working on the
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[stivale boot protocols](https://github.com/stivale).
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This file serves as the official centralised collection of features that
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@ -10,6 +10,10 @@ the Limine boot protocol is composed of. Other bootloaders may support extra
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unofficial features, but it is strongly recommended to avoid fragmentation
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and submit new features by opening a pull request to this repository.
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The [limine.h](/limine.h) file provides an implementation of all the
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structures and constants described in this document, for the C and C++
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languages.
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## General Notes
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All pointers are 64-bit wide. All pointers point to the object with the
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@ -121,7 +125,8 @@ with at least the following entries, starting at offset 0:
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The IDT is in an undefined state. Kernel must load its own.
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IF flag, VM flag, and direction flag are cleared on entry. Other flags undefined.
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IF flag, VM flag, and direction flag are cleared on entry. Other flags
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undefined.
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PG is enabled (`cr0`), PE is enabled (`cr0`), PAE is enabled (`cr4`),
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LME is enabled (`EFER`).
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@ -204,6 +209,46 @@ struct limine_hhdm_response {
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* `offset` - the virtual address offset of the beginning of the higher half
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direct map.
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### Terminal Feature
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ID:
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```c
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#define LIMINE_TERMINAL_REQUEST { LIMINE_COMMON_MAGIC, 0x0785a0aea5d0750f, 0x1c1936fee0d6cf6e }
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```
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Request:
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```c
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typedef void (*limine_terminal_callback)(uint64_t, uint64_t, uint64_t, uint64_t);
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struct limine_terminal_request {
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uint64_t id[4];
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uint64_t revision;
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struct limine_terminal_response *response;
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limine_terminal_callback callback;
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};
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```
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* `callback` - Pointer to the callback function.
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Response:
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```c
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typedef void (*limine_terminal_write)(const char *, uint64_t);
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struct limine_terminal_response {
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uint64_t revision;
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uint32_t columns;
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uint32_t rows;
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limine_terminal_write write;
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};
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```
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* `columns` and `rows` - Columns and rows provided by the terminal.
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* `write` - Physical pointer to the terminal write() function.
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Note: Omitting this request will cause the bootloader to not initialise
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the terminal service. The terminal is further documented in the stivale2
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specification.
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### Framebuffer Feature
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ID:
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@ -344,6 +389,62 @@ processor. This field is unused for the structure describing the bootstrap
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processor.
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* `extra_argument` - A free for use field.
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### Memory Map Feature
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ID:
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```c
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#define LIMINE_MEMMAP_REQUEST { LIMINE_COMMON_MAGIC, 0x67cf3d9d378a806f, 0xe304acdfc50c3c62 }
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```
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Request:
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```c
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struct limine_memmap_request {
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uint64_t id[4];
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uint64_t revision;
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struct limine_memmap_response *response;
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};
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```
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Response:
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```c
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struct limine_memmap_response {
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uint64_t revision;
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uint64_t entry_count;
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struct limine_memmap_entry **entries;
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};
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```
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* `entry_count` - How many memory map entries are present.
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* `entries` - Pointer to an array of `entry_count` pointers to
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`struct limine_memmap_entry` structures.
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```c
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// Constants for `type`
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#define LIMINE_MEMMAP_USABLE 0
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#define LIMINE_MEMMAP_RESERVED 1
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#define LIMINE_MEMMAP_ACPI_RECLAIMABLE 2
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#define LIMINE_MEMMAP_ACPI_NVS 3
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#define LIMINE_MEMMAP_BAD_MEMORY 4
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#define LIMINE_MEMMAP_BOOTLOADER_RECLAIMABLE 5
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#define LIMINE_MEMMAP_KERNEL_AND_MODULES 6
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#define LIMINE_MEMMAP_FRAMEBUFFER 7
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struct limine_memmap_entry {
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uint64_t base;
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uint64_t length;
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uint64_t type;
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};
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```
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Note: The kernel and modules loaded are not marked as usable memory.
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They are marked as Kernel/Modules. The entries are guaranteed to be sorted by
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base address, lowest to highest. Usable and bootloader reclaimable entries
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are guaranteed to be 4096 byte aligned for both base and length. Usable and
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bootloader reclaimable entries are guaranteed not to overlap with any other
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entry. To the contrary, all non-usable entries (including kernel/modules) are
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not guaranteed any alignment, nor is it guaranteed that they do not overlap
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other entries.
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### Entry Point Feature
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ID:
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@ -442,7 +543,8 @@ struct limine_file_location {
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* `revision` - Revision of the `struct limine_file_location` structure.
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* `partition_index` - 1-based partition index of the volume from which the
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module was loaded. If 0, it means invalid or unpartitioned.
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* `tftp_ip` - If non-0, this is the IP of the TFTP server the file was loaded from.
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* `tftp_ip` - If non-0, this is the IP of the TFTP server the file was loaded
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from.
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* `tftp_port` - Likewise, but port.
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* `mbr_disk_id` - If non-0, this is the ID of the disk the module was loaded
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from as reported in its MBR.
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@ -66,6 +66,7 @@ override INTERNAL_CFLAGS := \
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-I../freestanding_headers \
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-I'$(call SHESCAPE,$(BUILDDIR))/..' \
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-I. \
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-I.. \
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-I../stivale \
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-I'$(call SHESCAPE,$(BUILDDIR))/tinf'
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@ -3,7 +3,7 @@
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#include <stdint.h>
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// Misc
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/* Misc */
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#ifdef LIMINE_NO_POINTERS
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# define LIMINE_PTR(TYPE) uint64_t
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@ -31,7 +31,7 @@ struct limine_file_location {
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struct limine_uuid part_uuid;
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};
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// Boot info
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/* Boot info */
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#define LIMINE_BOOTLOADER_INFO_REQUEST { LIMINE_COMMON_MAGIC, 0xf55038d8e2a1202f, 0x279426fcf5f59740 }
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@ -47,7 +47,7 @@ struct limine_bootloader_info_request {
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LIMINE_PTR(struct limine_bootloader_info_response *) response;
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};
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// HHDM
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/* HHDM */
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#define LIMINE_HHDM_REQUEST { LIMINE_COMMON_MAGIC, 0x48dcf1cb8ad2b852, 0x63984e959a98244b }
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@ -62,7 +62,7 @@ struct limine_hhdm_request {
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LIMINE_PTR(struct limine_hhdm_response *) response;
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};
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// Framebuffer
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/* Framebuffer */
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#define LIMINE_FRAMEBUFFER_REQUEST { LIMINE_COMMON_MAGIC, 0xcbfe81d7dd2d1977, 0x063150319ebc9b71 }
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@ -98,7 +98,7 @@ struct limine_framebuffer_request {
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LIMINE_PTR(struct limine_framebuffer_response *) response;
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};
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// Terminal
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/* Terminal */
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#define LIMINE_TERMINAL_REQUEST { LIMINE_COMMON_MAGIC, 0x0785a0aea5d0750f, 0x1c1936fee0d6cf6e }
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@ -119,7 +119,7 @@ struct limine_terminal_request {
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LIMINE_PTR(limine_terminal_callback) callback;
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};
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// 5-level paging
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/* 5-level paging */
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#define LIMINE_5_LEVEL_PAGING_REQUEST { LIMINE_COMMON_MAGIC, 0x94469551da9b3192, 0xebe5e86db7382888 }
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@ -133,7 +133,7 @@ struct limine_5_level_paging_request {
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LIMINE_PTR(struct limine_5_level_paging_response *) response;
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};
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// SMP
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/* SMP */
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#define LIMINE_SMP_REQUEST { LIMINE_COMMON_MAGIC, 0x95a67b819a1b857e, 0xa0b61b723b6a73e0 }
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@ -164,7 +164,7 @@ struct limine_smp_request {
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uint64_t flags;
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};
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// Memory map
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/* Memory map */
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#define LIMINE_MEMMAP_REQUEST { LIMINE_COMMON_MAGIC, 0x67cf3d9d378a806f, 0xe304acdfc50c3c62 }
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@ -195,7 +195,7 @@ struct limine_memmap_request {
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LIMINE_PTR(struct limine_memmap_response *) response;
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};
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// Entry point
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/* Entry point */
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#define LIMINE_ENTRY_POINT_REQUEST { LIMINE_COMMON_MAGIC, 0x13d86c035a1cd3e1, 0x2b0caa89d8f3026a }
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@ -212,7 +212,7 @@ struct limine_entry_point_request {
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LIMINE_PTR(limine_entry_point) entry;
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};
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// Module
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/* Module */
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#define LIMINE_MODULE_REQUEST { LIMINE_COMMON_MAGIC, 0x3e7e279702be32af, 0xca1c4f3bd1280cee }
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@ -236,7 +236,7 @@ struct limine_module_request {
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LIMINE_PTR(struct limine_module_response *) response;
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};
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// RSDP
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/* RSDP */
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#define LIMINE_RSDP_REQUEST { LIMINE_COMMON_MAGIC, 0xc5e77b6b397e7b43, 0x27637845accdcf3c }
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@ -251,7 +251,7 @@ struct limine_rsdp_request {
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LIMINE_PTR(struct limine_rsdp_response *) response;
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};
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// SMBIOS
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/* SMBIOS */
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#define LIMINE_SMBIOS_REQUEST { LIMINE_COMMON_MAGIC, 0x9e9046f11e095391, 0xaa4a520fefbde5ee }
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@ -267,7 +267,7 @@ struct limine_smbios_request {
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LIMINE_PTR(struct limine_smbios_response *) response;
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};
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// EFI system table
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/* EFI system table */
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#define LIMINE_EFI_SYSTEM_TABLE_REQUEST { LIMINE_COMMON_MAGIC, 0x5ceba5163eaaf6d6, 0x0a6981610cf65fcc }
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@ -282,7 +282,7 @@ struct limine_efi_system_table_request {
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LIMINE_PTR(struct limine_efi_system_table_response *) response;
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};
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// Boot time
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/* Boot time */
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#define LIMINE_BOOT_TIME_REQUEST { LIMINE_COMMON_MAGIC, 0x502746e184c088aa, 0xfbc5ec83e6327893 }
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@ -297,7 +297,7 @@ struct limine_boot_time_request {
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LIMINE_PTR(struct limine_boot_time_response *) response;
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};
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// Kernel address
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/* Kernel address */
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#define LIMINE_KERNEL_ADDRESS_REQUEST { LIMINE_COMMON_MAGIC, 0x71ba76863cc55f63, 0xb2644a48c516a487 }
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@ -31,7 +31,7 @@ INTERNAL_LD_FLAGS_MULTIBOOT1 := \
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INTERNALCFLAGS := \
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-I../stivale \
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-I. \
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-I../common \
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-I.. \
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-std=c11 \
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-ffreestanding \
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-fno-stack-protector \
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