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docs: Continue work on Limine protocol spec

This commit is contained in:
mintsuki 2022-03-22 10:26:41 +01:00
parent 2fa2fb2220
commit c4f04dab95
4 changed files with 394 additions and 10 deletions
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384
PROTOCOL.md
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@ -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.

4
common/limine.h
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@ -23,8 +23,8 @@ struct limine_uuid {
struct limine_file_location {
uint64_t revision;
uint64_t partition_index;
uint32_t pxe_ip;
uint32_t pxe_port;
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;

4
common/protos/limine.c
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@ -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.pxe_port = file->pxe_port;
ret.tftp_ip = file->pxe_ip;
ret.tftp_port = file->pxe_port;
return ret;
}

12
test/limine.c
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@ -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",
(file_location->pxe_ip & (0xff << 0)) >> 0,
(file_location->pxe_ip & (0xff << 8)) >> 8,
(file_location->pxe_ip & (0xff << 16)) >> 16,
(file_location->pxe_ip & (0xff << 24)) >> 24);
e9_printf("Loc->PXEPort: %d", file_location->pxe_port);
e9_printf("Loc->TFTPIP: %d.%d.%d.%d",
(file_location->tftp_ip & (0xff << 0)) >> 0,
(file_location->tftp_ip & (0xff << 8)) >> 8,
(file_location->tftp_ip & (0xff << 16)) >> 16,
(file_location->tftp_ip & (0xff << 24)) >> 24);
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,