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docs: limine: Document SMP request

This commit is contained in:
mintsuki 2022-03-24 02:18:33 +01:00
parent c4f04dab95
commit 21f8640510
5 changed files with 227 additions and 158 deletions
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363
PROTOCOL.md
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@ -10,6 +10,11 @@ the Limine boot protocol is composed of. Other bootloaders may support extra
unofficial features, but it is strongly recommended to avoid fragmentation
and submit new features by opening a pull request to this repository.
## General Notes
All pointers are 64-bit wide. All pointers point to the object with the
higher half direct map offset already added to them, unless otherwise noted.
## Features
The protocol is centered around the concept of request/response - collectively
@ -131,12 +136,12 @@ Legacy PIC and IO APIC IRQs are all masked.
If booted by EFI/UEFI, boot services are exited.
`rsp` is set to point to a stack, in bootloader-reserved memory, which is
at least 8KiB (8192 bytes) in size. An invalid return address of 0 is pushed
at least 16KiB (16384 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
## Feature List
Request IDs are composed of 4 64-bit unsigned integers, but the first 2 are
common to every request:
@ -144,7 +149,7 @@ common to every request:
#define LIMINE_COMMON_MAGIC 0xc7b1dd30df4c8b88, 0x0a82e883a194f07b
```
## Bootloader Info Feature
### Bootloader Info Feature
ID:
```c
@ -172,7 +177,7 @@ struct limine_bootloader_info_response {
`name` and `version` are 0-terminated ASCII strings containing the name and
version of the loading bootloader.
## HHDM (Higher Half Direct Map) Feature
### HHDM (Higher Half Direct Map) Feature
ID:
```c
@ -192,14 +197,14 @@ Response:
```c
struct limine_hhdm_response {
uint64_t revision;
uint64_t address;
uint64_t offset;
};
```
* `address` - the virtual address of the beginning of the higher half direct
map.
* `offset` - the virtual address offset of the beginning of the higher half
direct map.
## Framebuffer Feature
### Framebuffer Feature
ID:
```c
@ -251,7 +256,7 @@ struct limine_framebuffer {
};
```
## 5-Level Paging Feature
### 5-Level Paging Feature
ID:
```c
@ -276,9 +281,70 @@ struct limine_5_level_paging_response {
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.
If the response pointer is unchanged, 5-level paging is engaged.
## Entry Point Feature
### SMP (multiprocessor) Feature
ID:
```c
#define LIMINE_SMP_REQUEST { LIMINE_COMMON_MAGIC, 0x95a67b819a1b857e, 0xa0b61b723b6a73e0 }
```
Request:
```c
struct limine_smp_request {
uint64_t id[4];
uint64_t revision;
struct limine_smp_response *response;
uint64_t flags;
};
```
* `flags` - Bit 0: Enable X2APIC, if possible.
Response:
```c
struct limine_smp_response {
uint64_t revision;
uint32_t flags;
uint32_t bsp_lapic_id;
uint64_t cpu_count;
struct limine_smp_info **cpus;
};
```
* `flags` - Bit 0: X2APIC has been enabled.
* `bsp_lapic_id` - The Local APIC ID of the bootstrap processor.
* `cpu_count` - How many CPUs are present. It includes the bootstrap processor.
* `cpus` - Pointer to an array of `cpu_count` pointers to
`struct limine_smp_info` structures.
Notes: The presence of this request will prompt the bootloader to bootstrap
the secondary processors. This will not be done if this request is not present.
```c
typedef void (*limine_goto_address)(void);
struct limine_smp_info {
uint32_t processor_id;
uint32_t lapic_id;
uint64_t reserved;
limine_goto_address goto_address;
uint64_t extra_argument;
};
```
* `processor_id` - ACPI Processor UID as specified by the MADT
* `lapic_id` - Local APIC ID of the processor as specified by the MADT
* `goto_address` - An atomic write to this field causes the parked CPU to
jump to the written address, on a 16KiB stack. A pointer to the
`struct limine_smp_info` structure of the CPU is passed in `RDI`. Other than
that, the CPU state will be the same as described for the bootstrap
processor. This field is unused for the structure describing the bootstrap
processor.
* `extra_argument` - A free for use field.
### Entry Point Feature
ID:
```c
@ -306,141 +372,7 @@ struct limine_entry_point_response {
};
```
## 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
### Module Feature
ID:
```c
@ -471,7 +403,7 @@ struct limine_module_response {
```c
struct limine_module {
uint64_t base;
void *base;
uint64_t length;
char *path;
char *cmdline;
@ -485,7 +417,7 @@ struct limine_module {
* `cmdline` - A command line associated with the module.
* `file_location` - A pointer to the file location structure for the module.
### File Location Structure
#### File Location Structure
```c
struct limine_uuid {
@ -507,6 +439,7 @@ struct limine_file_location {
};
```
* `revision` - Revision of the `struct limine_file_location` structure.
* `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.
@ -519,3 +452,137 @@ loaded from as reported in its GPT.
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.
### 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.

8
common/limine.h
View File

@ -53,7 +53,7 @@ struct limine_bootloader_info_request {
struct limine_hhdm_response {
uint64_t revision;
uint64_t address;
uint64_t offset;
};
struct limine_hhdm_request {
@ -139,11 +139,13 @@ struct limine_5_level_paging_request {
#define LIMINE_SMP_X2APIC (1 << 0)
typedef void (*limine_goto_address)(void);
struct limine_smp_info {
uint32_t processor_id;
uint32_t lapic_id;
uint64_t reserved;
LIMINE_PTR(void *) goto_address;
LIMINE_PTR(limine_goto_address) goto_address;
uint64_t extra_argument;
};
@ -215,7 +217,7 @@ struct limine_entry_point_request {
#define LIMINE_MODULE_REQUEST { LIMINE_COMMON_MAGIC, 0x3e7e279702be32af, 0xca1c4f3bd1280cee }
struct limine_module {
uint64_t base;
LIMINE_PTR(void *) base;
uint64_t length;
LIMINE_PTR(char *) path;
LIMINE_PTR(char *) cmdline;

10
common/protos/limine.c
View File

@ -279,7 +279,7 @@ FEAT_START
struct limine_hhdm_response *hhdm_response =
ext_mem_alloc(sizeof(struct limine_hhdm_response));
hhdm_response->address = direct_map_offset;
hhdm_response->offset = direct_map_offset;
hhdm_request->response = reported_addr(hhdm_response);
FEAT_END
@ -455,7 +455,7 @@ FEAT_START
#if defined (__i386__)
if (stivale2_rt_stack == NULL) {
stivale2_rt_stack = ext_mem_alloc(8192);
stivale2_rt_stack = ext_mem_alloc(16384);
}
terminal_response->write = (uintptr_t)(void *)stivale2_term_write_entry;
@ -548,7 +548,7 @@ FEAT_END
local_gdt->ptr_hi = local_gdt_base >> 32;
#endif
void *stack = ext_mem_alloc(8192) + 8192;
void *stack = ext_mem_alloc(16384) + 16384;
pagemap_t pagemap = {0};
pagemap = stivale_build_pagemap(want_5lv, true, ranges, ranges_count, true,
@ -580,8 +580,8 @@ FEAT_START
}
for (size_t i = 0; i < cpu_count; i++) {
void *cpu_stack = ext_mem_alloc(8192) + 8192;
smp_info[i].stack_addr = reported_addr(cpu_stack + 8192);
void *cpu_stack = ext_mem_alloc(16384) + 16384;
smp_info[i].stack_addr = reported_addr(cpu_stack + 16384);
}
struct limine_smp_response *smp_response =

2
test/limine.c
View File

@ -170,7 +170,7 @@ FEAT_START
}
struct limine_hhdm_response *hhdm_response = hhdm_request.response;
e9_printf("HHDM feature, revision %d", hhdm_response->revision);
e9_printf("Higher half direct map at: %x", hhdm_response->address);
e9_printf("Higher half direct map at: %x", hhdm_response->offset);
FEAT_END
FEAT_START

2
test/limine.cfg
View File

@ -18,7 +18,7 @@ TERM_BACKDROP=008080
KERNEL_PATH=${TEST_KERNEL}
KERNEL_CMDLINE=This is an example kernel command line.
MODULE_PATH=${BACKGROUND_PATH}
MODULE_PATH=${WALLPAPER_PATH}
MODULE_CMDLINE=This is the first module.
MODULE_PATH=boot:///boot/bg.bmp