From b1a912a8a6ff472a49b2e0a09cfd433adfc2cb24 Mon Sep 17 00:00:00 2001
From: Benji Dial <benji@benjidial.net>
Date: Sat, 18 May 2024 21:53:38 -0400
Subject: reorganization, cross compiler

---
 kernel/syscall.asm | 88 ------------------------------------------------------
 1 file changed, 88 deletions(-)
 delete mode 100644 kernel/syscall.asm

(limited to 'kernel/syscall.asm')

diff --git a/kernel/syscall.asm b/kernel/syscall.asm
deleted file mode 100644
index c293402..0000000
--- a/kernel/syscall.asm
+++ /dev/null
@@ -1,88 +0,0 @@
-bits 64
-
-global start_user_mode
-
-section .text
-
-extern do_syscall
-
-syscall_entry:
-  mov r11, rsp
-  mov rsp, 0xfffffffffffff000
-  push r11
-  push rcx
-
-  push rdx
-  push rsi
-  push rdi
-  push rax
-
-  mov rdi, rsp
-  lea rsi, [rsp + 8]
-  lea rdx, [rsp + 16]
-  lea rcx, [rsp + 24]
-
-  call do_syscall
-
-  pop rax
-  pop rdi
-  pop rsi
-  pop rdx
-
-  xor r8, r8
-  xor r9, r9
-  xor r10, r10
-  xor r11, r11
-  or r11, 0x200
-  pop rcx
-  pop rsp
-
-  o64 sysret
-
-start_user_mode:
-;intended rip in rdi
-;intended rsp in rsi
-;intended p4_paddr in rdx
-
-  mov rax, rdx
-  mov cr3, rax
-
-  ;efer <- efer | 0x1
-  mov rcx, 0xc0000080
-  rdmsr
-  or al, 1
-  wrmsr
-
-  ;lstar <- syscall_entry
-  mov rdx, syscall_entry
-  mov eax, edx
-  shr rdx, 32
-  mov ecx, 0xc0000082
-  wrmsr
-
-  ;star <- 0x0030.0028.0000.0000
-  mov edx, 0x00300028
-  xor eax, eax
-  mov ecx, 0xc0000081
-  wrmsr
-
-  mov rcx, rdi
-  mov rsp, rsi
-  xor r11, r11
-  or r11, 0x200
-
-  xor rax, rax
-  xor rbx, rbx
-  xor rdx, rdx
-  xor rdi, rdi
-  xor rsi, rsi
-  xor rbp, rbp
-  xor r8, r8
-  xor r9, r9
-  xor r10, r10
-  xor r12, r12
-  xor r13, r13
-  xor r14, r14
-  xor r15, r15
-
-  o64 sysret
-- 
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