feat: initial scalable x86_64 microkernel skeleton with Limine, Rust, C HAL, and C++20 IPC
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RarDog
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#pragma once
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#include "types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* IPC Protocol Flags */
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#define IPC_FLAG_FAST_REGISTERS (1 << 0) /* Message fits entirely in registers */
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#define IPC_FLAG_SHM_ATTACHED (1 << 1) /* Attached shared memory buffer */
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#define IPC_FLAG_CAP_TRANSFER (1 << 2) /* Delegating capability in message */
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#define IPC_FLAG_NONBLOCKING (1 << 3) /* Return immediately if receiver not ready */
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/* Shared Memory Descriptor for Zero-Copy Transfers */
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typedef struct ipc_shm_desc {
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cap_t shm_cap; /* Capability to shared memory region */
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uint64_t offset; /* Offset within SHM buffer */
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uint64_t length; /* Length of data payload */
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uint32_t permissions; /* Read/Write flags */
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uint32_t _reserved;
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} __attribute__((packed)) ipc_shm_desc_t;
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/* IPC Message Payload Representation */
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typedef struct ipc_msg {
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uint64_t badge; /* Sender authentication badge (injected by kernel) */
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uint32_t opcode; /* Interface Method / Function ID */
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uint32_t flags; /* IPC_FLAG_* */
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/* Fast-Path Register Payload (4 x 64-bit = 32 bytes directly passed) */
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uint64_t args[4];
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/* Zero-Copy Extended Descriptor */
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ipc_shm_desc_t shm;
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} __attribute__((aligned(16))) ipc_msg_t;
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/* Standard Common IPC Opcodes */
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#define IPC_OP_PING 0x0001
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#define IPC_OP_PONG 0x0002
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#define IPC_OP_REGISTER_SERVER 0x0010
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#define IPC_OP_LOOKUP_SERVER 0x0011
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#define IPC_OP_NOTIFY_EVENT 0x0020
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#define IPC_OP_READ 0x0100
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#define IPC_OP_WRITE 0x0101
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#define IPC_OP_IOCTL 0x0102
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#ifdef __cplusplus
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}
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#endif
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#pragma once
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#include "types.h"
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/* Syscall Numbers (passed in RAX) */
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#define SYS_IPC_CALL 1 /* Synchronous call: send message & wait for reply */
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#define SYS_IPC_REPLY_RECV 2 /* Server fast-path: reply to current and wait next */
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#define SYS_IPC_SEND 3 /* Asynchronous/non-blocking send */
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#define SYS_IPC_RECV 4 /* Block waiting for incoming message */
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#define SYS_MEM_MAP 5 /* Map memory / shared memory region */
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#define SYS_CAP_GRANT 6 /* Delegate capability to CNode */
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#define SYS_THREAD_YIELD 7 /* Yield CPU slice */
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#define SYS_THREAD_EXIT 8 /* Terminate current thread */
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#define SYS_LOG_DEBUG 9 /* Direct Ring 0 debug print */
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#ifndef __ASSEMBLER__
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Low-level inline syscall invocations adhering to System V AMD64 ABI + Fast-Path */
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static inline sysret_t sys_ipc_call_raw(cap_t dest_cap, uint64_t msg_code,
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uint64_t arg0, uint64_t arg1,
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uint64_t arg2, uint64_t arg3,
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uint64_t *out0, uint64_t *out1) {
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register uint64_t rax __asm__("rax") = SYS_IPC_CALL;
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register uint64_t rdi __asm__("rdi") = dest_cap;
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register uint64_t rsi __asm__("rsi") = msg_code;
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register uint64_t rdx __asm__("rdx") = arg0;
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register uint64_t r8 __asm__("r8") = arg1;
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register uint64_t r9 __asm__("r9") = arg2;
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register uint64_t r10 __asm__("r10") = arg3;
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__asm__ volatile(
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"syscall"
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: "+r"(rax), "+r"(rdx), "+r"(r8)
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: "r"(rdi), "r"(rsi), "r"(r9), "r"(r10)
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: "rcx", "r11", "memory"
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);
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if (out0) *out0 = rdx;
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if (out1) *out1 = r8;
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return (sysret_t)rax;
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}
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static inline sysret_t sys_yield(void) {
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register uint64_t rax __asm__("rax") = SYS_THREAD_YIELD;
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__asm__ volatile("syscall" : "+r"(rax) : : "rcx", "r11", "memory");
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return (sysret_t)rax;
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}
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static inline void sys_exit(int code) {
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register uint64_t rax __asm__("rax") = SYS_THREAD_EXIT;
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register uint64_t rdi __asm__("rdi") = (uint64_t)code;
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__asm__ volatile("syscall" : "+r"(rax) : "r"(rdi) : "rcx", "r11", "memory");
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__builtin_unreachable();
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}
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static inline sysret_t sys_log_debug(const char *msg, size_t len) {
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register uint64_t rax __asm__("rax") = SYS_LOG_DEBUG;
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register uint64_t rdi __asm__("rdi") = (uint64_t)msg;
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register uint64_t rsi __asm__("rsi") = (uint64_t)len;
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__asm__ volatile("syscall" : "+r"(rax) : "r"(rdi), "r"(rsi) : "rcx", "r11", "memory");
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return (sysret_t)rax;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ASSEMBLER__ */
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@@ -0,0 +1,38 @@
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#pragma once
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#ifndef __ASSEMBLER__
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#include <stdint.h>
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#include <stddef.h>
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#include <stdbool.h>
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#else
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#define UINT64_C(c) c
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#endif
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/* Standard Type Definitions */
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typedef uint64_t cap_t; /* Capability handle */
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typedef uint64_t vaddr_t; /* Virtual Address */
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typedef uint64_t paddr_t; /* Physical Address */
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typedef int64_t sysret_t; /* Syscall Return Code */
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typedef uint32_t pid_t; /* Process ID */
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typedef uint32_t tid_t; /* Thread ID */
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/* Standard Return / Error Codes */
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#define SYS_OK 0
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#define SYS_ERR_INVALID_ARG -1
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#define SYS_ERR_INVALID_CAP -2
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#define SYS_ERR_NO_MEMORY -3
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#define SYS_ERR_IPC_TIMEOUT -4
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#define SYS_ERR_IPC_DEADLOCK -5
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#define SYS_ERR_PERMISSION -6
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#define SYS_ERR_NOT_FOUND -7
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#define SYS_ERR_ALREADY_EXISTS -8
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#define SYS_ERR_BUSY -9
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/* Standard Special Capabilities */
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#define CAP_NULL 0
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#define CAP_SELF_TASK 1
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#define CAP_SELF_THREAD 2
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#define CAP_SELF_VMSPACE 3
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#define CAP_ROOT_CSPACE 4
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#define CAP_ROOT_IRQ 5
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#define CAP_ROOT_IO 6
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