Implement syscalls, hello world from userspace

2025-09-02 23:51:14 +02:00
parent 920de10025
commit 8a12f23b69
24 changed files with 313 additions and 44 deletions
--- a/kernel/hal/x86_64/syscall0.S
+++ b/kernel/hal/x86_64/syscall0.S
@ -0,0 +1,48 @@
+#include "regs.S"
+
+.extern hal_syscalldispatch
+
+.global hal_enable_syscallentry
+hal_enable_syscallentry:
+  movq $0xC0000080, %rcx
+  rdmsr
+  or $0x1, %eax
+  wrmsr
+  movq $0xC0000081, %rcx
+  rdmsr
+  movl $0x180008, %edx
+  wrmsr
+  ret
+
+.global hal_syscallentry
+hal_syscallentry:
+  cli
+  swapgs
+
+  movq %rsp, %gs:0x8
+  movq %gs:0x0, %rsp
+
+  pushq $0x23
+  pushq %gs:0x8
+
+  swapgs
+
+  pushq %r11
+  pushq $0x1b
+  pushq %rcx
+
+  _push_regs
+
+  mov %rsp, %rdi
+  mov $0x0, %rbp
+
+  call hal_syscalldispatch
+  cli
+
+  _pop_regs
+
+  popq %rcx
+  add $0x8, %rsp
+  popq %r11
+  popq %rsp
+  sysret