docs: limine: Document SMP request
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PROTOCOL.md
363
PROTOCOL.md
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@ -10,6 +10,11 @@ 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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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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and submit new features by opening a pull request to this repository.
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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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higher half direct map offset already added to them, unless otherwise noted.
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## Features
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## Features
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The protocol is centered around the concept of request/response - collectively
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The protocol is centered around the concept of request/response - collectively
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@ -131,12 +136,12 @@ Legacy PIC and IO APIC IRQs are all masked.
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If booted by EFI/UEFI, boot services are exited.
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If booted by EFI/UEFI, boot services are exited.
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`rsp` is set to point to a stack, in bootloader-reserved memory, which is
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`rsp` is set to point to a stack, in bootloader-reserved memory, which is
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at least 8KiB (8192 bytes) in size. An invalid return address of 0 is pushed
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at least 16KiB (16384 bytes) in size. An invalid return address of 0 is pushed
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to the stack before jumping to the kernel.
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to the stack before jumping to the kernel.
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All other general purpose registers are set to 0.
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All other general purpose registers are set to 0.
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# Feature List
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## Feature List
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Request IDs are composed of 4 64-bit unsigned integers, but the first 2 are
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Request IDs are composed of 4 64-bit unsigned integers, but the first 2 are
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common to every request:
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common to every request:
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@ -144,7 +149,7 @@ common to every request:
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#define LIMINE_COMMON_MAGIC 0xc7b1dd30df4c8b88, 0x0a82e883a194f07b
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#define LIMINE_COMMON_MAGIC 0xc7b1dd30df4c8b88, 0x0a82e883a194f07b
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```
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```
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## Bootloader Info Feature
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### Bootloader Info Feature
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ID:
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ID:
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```c
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```c
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@ -172,7 +177,7 @@ struct limine_bootloader_info_response {
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`name` and `version` are 0-terminated ASCII strings containing the name and
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`name` and `version` are 0-terminated ASCII strings containing the name and
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version of the loading bootloader.
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version of the loading bootloader.
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## HHDM (Higher Half Direct Map) Feature
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### HHDM (Higher Half Direct Map) Feature
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ID:
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ID:
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```c
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```c
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@ -192,14 +197,14 @@ Response:
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```c
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```c
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struct limine_hhdm_response {
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struct limine_hhdm_response {
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uint64_t revision;
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uint64_t revision;
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uint64_t address;
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uint64_t offset;
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};
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};
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```
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```
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* `address` - the virtual address of the beginning of the higher half direct
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* `offset` - the virtual address offset of the beginning of the higher half
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map.
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direct map.
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## Framebuffer Feature
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### Framebuffer Feature
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ID:
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ID:
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```c
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```c
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@ -251,7 +256,7 @@ struct limine_framebuffer {
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};
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};
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```
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```
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## 5-Level Paging Feature
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### 5-Level Paging Feature
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ID:
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ID:
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```c
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```c
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@ -276,9 +281,70 @@ struct limine_5_level_paging_response {
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Notes: The presence of this request will prompt the bootloader to turn on
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Notes: The presence of this request will prompt the bootloader to turn on
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x86_64 5-level paging. It will not be turned on if this request is not present.
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x86_64 5-level paging. It will not be turned on if this request is not present.
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If the response pointer is non-NULL, 5-level paging is engaged.
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If the response pointer is unchanged, 5-level paging is engaged.
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## Entry Point Feature
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### SMP (multiprocessor) Feature
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ID:
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```c
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#define LIMINE_SMP_REQUEST { LIMINE_COMMON_MAGIC, 0x95a67b819a1b857e, 0xa0b61b723b6a73e0 }
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```
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Request:
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```c
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struct limine_smp_request {
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uint64_t id[4];
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uint64_t revision;
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struct limine_smp_response *response;
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uint64_t flags;
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};
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```
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* `flags` - Bit 0: Enable X2APIC, if possible.
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Response:
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```c
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struct limine_smp_response {
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uint64_t revision;
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uint32_t flags;
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uint32_t bsp_lapic_id;
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uint64_t cpu_count;
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struct limine_smp_info **cpus;
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};
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```
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* `flags` - Bit 0: X2APIC has been enabled.
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* `bsp_lapic_id` - The Local APIC ID of the bootstrap processor.
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* `cpu_count` - How many CPUs are present. It includes the bootstrap processor.
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* `cpus` - Pointer to an array of `cpu_count` pointers to
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`struct limine_smp_info` structures.
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Notes: The presence of this request will prompt the bootloader to bootstrap
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the secondary processors. This will not be done if this request is not present.
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```c
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typedef void (*limine_goto_address)(void);
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struct limine_smp_info {
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uint32_t processor_id;
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uint32_t lapic_id;
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uint64_t reserved;
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limine_goto_address goto_address;
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uint64_t extra_argument;
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};
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```
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* `processor_id` - ACPI Processor UID as specified by the MADT
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* `lapic_id` - Local APIC ID of the processor as specified by the MADT
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* `goto_address` - An atomic write to this field causes the parked CPU to
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jump to the written address, on a 16KiB stack. A pointer to the
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`struct limine_smp_info` structure of the CPU is passed in `RDI`. Other than
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that, the CPU state will be the same as described for the bootstrap
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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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### Entry Point Feature
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ID:
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ID:
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```c
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```c
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@ -306,141 +372,7 @@ struct limine_entry_point_response {
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};
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};
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```
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```
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## RSDP Feature
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### Module Feature
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ID:
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```c
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#define LIMINE_RSDP_REQUEST { LIMINE_COMMON_MAGIC, 0xc5e77b6b397e7b43, 0x27637845accdcf3c }
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```
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Request:
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```c
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struct limine_rsdp_request {
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uint64_t id[4];
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uint64_t revision;
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struct limine_rsdp_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_rsdp_response {
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uint64_t revision;
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void *address;
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};
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```
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* `address` - Address of the RSDP table.
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## SMBIOS Feature
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ID:
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```c
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#define LIMINE_SMBIOS_REQUEST { LIMINE_COMMON_MAGIC, 0x9e9046f11e095391, 0xaa4a520fefbde5ee }
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```
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Request:
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```c
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struct limine_smbios_request {
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uint64_t id[4];
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uint64_t revision;
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struct limine_smbios_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_smbios_response {
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uint64_t revision;
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void *entry_32;
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void *entry_64;
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};
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```
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* `entry_32` - Address of the 32-bit SMBIOS entry point. NULL if not present.
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* `entry_64` - Address of the 64-bit SMBIOS entry point. NULL if not present.
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## EFI System Table Feature
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ID:
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```c
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#define LIMINE_EFI_SYSTEM_TABLE_REQUEST { LIMINE_COMMON_MAGIC, 0x5ceba5163eaaf6d6, 0x0a6981610cf65fcc }
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```
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Request:
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```c
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struct limine_efi_system_table_request {
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uint64_t id[4];
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uint64_t revision;
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struct limine_efi_system_table_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_efi_system_table_response {
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uint64_t revision;
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void *address;
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};
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```
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* `address` - Address of EFI system table.
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## Boot Time Feature
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ID:
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```c
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#define LIMINE_BOOT_TIME_REQUEST { LIMINE_COMMON_MAGIC, 0x502746e184c088aa, 0xfbc5ec83e6327893 }
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```
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Request:
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```c
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struct limine_boot_time_request {
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uint64_t id[4];
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uint64_t revision;
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struct limine_boot_time_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_boot_time_response {
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uint64_t revision;
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int64_t boot_time;
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};
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```
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* `boot_time` - The UNIX time on boot, in seconds, taken from the system RTC.
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## Kernel Address Feature
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ID:
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```c
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#define LIMINE_KERNEL_ADDRESS_REQUEST { LIMINE_COMMON_MAGIC, 0x71ba76863cc55f63, 0xb2644a48c516a487 }
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```
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Request:
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```c
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struct limine_kernel_address_request {
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uint64_t id[4];
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uint64_t revision;
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struct limine_kernel_address_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_kernel_address_response {
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uint64_t revision;
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uint64_t physical_base;
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uint64_t virtual_base;
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};
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```
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* `physical_base` - The physical base address of the kernel.
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* `virtual_base` - The virtual base address of the kernel.
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## Module Feature
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ID:
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ID:
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```c
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```c
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@ -471,7 +403,7 @@ struct limine_module_response {
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```c
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```c
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struct limine_module {
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struct limine_module {
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uint64_t base;
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void *base;
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uint64_t length;
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uint64_t length;
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char *path;
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char *path;
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char *cmdline;
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char *cmdline;
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@ -485,7 +417,7 @@ struct limine_module {
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* `cmdline` - A command line associated with the module.
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* `cmdline` - A command line associated with the module.
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* `file_location` - A pointer to the file location structure for the module.
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* `file_location` - A pointer to the file location structure for the module.
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### File Location Structure
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#### File Location Structure
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```c
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```c
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struct limine_uuid {
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struct limine_uuid {
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@ -507,6 +439,7 @@ struct limine_file_location {
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};
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};
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```
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```
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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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* `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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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 from.
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@ -519,3 +452,137 @@ loaded from as reported in its GPT.
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was loaded from as reported in the GPT.
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was loaded from as reported in the GPT.
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* `part_uuid` - If non-0, this is the UUID of the filesystem of the partition
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* `part_uuid` - If non-0, this is the UUID of the filesystem of the partition
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the module was loaded from.
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the module was loaded from.
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### RSDP Feature
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ID:
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```c
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#define LIMINE_RSDP_REQUEST { LIMINE_COMMON_MAGIC, 0xc5e77b6b397e7b43, 0x27637845accdcf3c }
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```
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Request:
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```c
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struct limine_rsdp_request {
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uint64_t id[4];
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uint64_t revision;
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struct limine_rsdp_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_rsdp_response {
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uint64_t revision;
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void *address;
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};
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```
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* `address` - Address of the RSDP table.
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### SMBIOS Feature
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ID:
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```c
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#define LIMINE_SMBIOS_REQUEST { LIMINE_COMMON_MAGIC, 0x9e9046f11e095391, 0xaa4a520fefbde5ee }
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```
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Request:
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```c
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struct limine_smbios_request {
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uint64_t id[4];
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uint64_t revision;
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struct limine_smbios_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_smbios_response {
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uint64_t revision;
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void *entry_32;
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void *entry_64;
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};
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```
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* `entry_32` - Address of the 32-bit SMBIOS entry point. NULL if not present.
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* `entry_64` - Address of the 64-bit SMBIOS entry point. NULL if not present.
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### EFI System Table Feature
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ID:
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```c
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#define LIMINE_EFI_SYSTEM_TABLE_REQUEST { LIMINE_COMMON_MAGIC, 0x5ceba5163eaaf6d6, 0x0a6981610cf65fcc }
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```
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Request:
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```c
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struct limine_efi_system_table_request {
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uint64_t id[4];
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uint64_t revision;
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struct limine_efi_system_table_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_efi_system_table_response {
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uint64_t revision;
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void *address;
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};
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```
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* `address` - Address of EFI system table.
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### Boot Time Feature
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|
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.
|
||||||
|
|
|
@ -53,7 +53,7 @@ struct limine_bootloader_info_request {
|
||||||
|
|
||||||
struct limine_hhdm_response {
|
struct limine_hhdm_response {
|
||||||
uint64_t revision;
|
uint64_t revision;
|
||||||
uint64_t address;
|
uint64_t offset;
|
||||||
};
|
};
|
||||||
|
|
||||||
struct limine_hhdm_request {
|
struct limine_hhdm_request {
|
||||||
|
@ -139,11 +139,13 @@ struct limine_5_level_paging_request {
|
||||||
|
|
||||||
#define LIMINE_SMP_X2APIC (1 << 0)
|
#define LIMINE_SMP_X2APIC (1 << 0)
|
||||||
|
|
||||||
|
typedef void (*limine_goto_address)(void);
|
||||||
|
|
||||||
struct limine_smp_info {
|
struct limine_smp_info {
|
||||||
uint32_t processor_id;
|
uint32_t processor_id;
|
||||||
uint32_t lapic_id;
|
uint32_t lapic_id;
|
||||||
uint64_t reserved;
|
uint64_t reserved;
|
||||||
LIMINE_PTR(void *) goto_address;
|
LIMINE_PTR(limine_goto_address) goto_address;
|
||||||
uint64_t extra_argument;
|
uint64_t extra_argument;
|
||||||
};
|
};
|
||||||
|
|
||||||
|
@ -215,7 +217,7 @@ struct limine_entry_point_request {
|
||||||
#define LIMINE_MODULE_REQUEST { LIMINE_COMMON_MAGIC, 0x3e7e279702be32af, 0xca1c4f3bd1280cee }
|
#define LIMINE_MODULE_REQUEST { LIMINE_COMMON_MAGIC, 0x3e7e279702be32af, 0xca1c4f3bd1280cee }
|
||||||
|
|
||||||
struct limine_module {
|
struct limine_module {
|
||||||
uint64_t base;
|
LIMINE_PTR(void *) base;
|
||||||
uint64_t length;
|
uint64_t length;
|
||||||
LIMINE_PTR(char *) path;
|
LIMINE_PTR(char *) path;
|
||||||
LIMINE_PTR(char *) cmdline;
|
LIMINE_PTR(char *) cmdline;
|
||||||
|
|
|
@ -279,7 +279,7 @@ FEAT_START
|
||||||
struct limine_hhdm_response *hhdm_response =
|
struct limine_hhdm_response *hhdm_response =
|
||||||
ext_mem_alloc(sizeof(struct limine_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);
|
hhdm_request->response = reported_addr(hhdm_response);
|
||||||
FEAT_END
|
FEAT_END
|
||||||
|
@ -455,7 +455,7 @@ FEAT_START
|
||||||
|
|
||||||
#if defined (__i386__)
|
#if defined (__i386__)
|
||||||
if (stivale2_rt_stack == NULL) {
|
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;
|
terminal_response->write = (uintptr_t)(void *)stivale2_term_write_entry;
|
||||||
|
@ -548,7 +548,7 @@ FEAT_END
|
||||||
local_gdt->ptr_hi = local_gdt_base >> 32;
|
local_gdt->ptr_hi = local_gdt_base >> 32;
|
||||||
#endif
|
#endif
|
||||||
|
|
||||||
void *stack = ext_mem_alloc(8192) + 8192;
|
void *stack = ext_mem_alloc(16384) + 16384;
|
||||||
|
|
||||||
pagemap_t pagemap = {0};
|
pagemap_t pagemap = {0};
|
||||||
pagemap = stivale_build_pagemap(want_5lv, true, ranges, ranges_count, true,
|
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++) {
|
for (size_t i = 0; i < cpu_count; i++) {
|
||||||
void *cpu_stack = ext_mem_alloc(8192) + 8192;
|
void *cpu_stack = ext_mem_alloc(16384) + 16384;
|
||||||
smp_info[i].stack_addr = reported_addr(cpu_stack + 8192);
|
smp_info[i].stack_addr = reported_addr(cpu_stack + 16384);
|
||||||
}
|
}
|
||||||
|
|
||||||
struct limine_smp_response *smp_response =
|
struct limine_smp_response *smp_response =
|
||||||
|
|
|
@ -170,7 +170,7 @@ FEAT_START
|
||||||
}
|
}
|
||||||
struct limine_hhdm_response *hhdm_response = hhdm_request.response;
|
struct limine_hhdm_response *hhdm_response = hhdm_request.response;
|
||||||
e9_printf("HHDM feature, revision %d", hhdm_response->revision);
|
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_END
|
||||||
|
|
||||||
FEAT_START
|
FEAT_START
|
||||||
|
|
|
@ -18,7 +18,7 @@ TERM_BACKDROP=008080
|
||||||
KERNEL_PATH=${TEST_KERNEL}
|
KERNEL_PATH=${TEST_KERNEL}
|
||||||
KERNEL_CMDLINE=This is an example kernel command line.
|
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_CMDLINE=This is the first module.
|
||||||
|
|
||||||
MODULE_PATH=boot:///boot/bg.bmp
|
MODULE_PATH=boot:///boot/bg.bmp
|
||||||
|
|
Loading…
Reference in New Issue