From 132d3236bb884433bf94e961f6d32264e0334aec Mon Sep 17 00:00:00 2001
From: ornitorrincos
Date: Tue, 18 Aug 2026 12:15:05 +0200
Subject: 

---
 kernel/asm_inline.h | 207 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 207 insertions(+)
 create mode 100644 kernel/asm_inline.h

(limited to 'kernel/asm_inline.h')

diff --git a/kernel/asm_inline.h b/kernel/asm_inline.h
new file mode 100644
index 0000000..7107618
--- /dev/null
+++ b/kernel/asm_inline.h
@@ -0,0 +1,207 @@
+#pragma once
+
+#include <stdint.h>
+
+// intel:
+// mov dst, src
+// mov eax, 16
+// mov eax, 0ffh
+// 
+// move whats pointed by ebx into eax
+// mov eax, [ebx]
+//
+// no need to use movb
+// this already moves a byte
+// mov al, 5
+
+// registers
+// +----------------+-----------------+-----------------+
+// | 8 Bit - No REX | 16 Bit - No REX | 32 Bit - No REX |
+// +-------+--------+-----------------+-----------------|
+// |   AL  |    AH  |       AX        |       EAX       |
+// |   BL  |    BH  |       BX        |       EBX       |
+// |   CL  |    CH  |       CX        |       ECX       |
+// |   DL  |    DH  |       DX        |       EDX       |
+// +-------+--------+       DI        |       EDI       |
+// +////////////////+       SI        |       EDI       |
+// +////////////////+       BP        |       EBP       |
+// +////////////////+       SP        |       ESP       |
+// +----------------+-----------------+-----------------+------------+
+// | 8 Bit -  REX   |  16 Bit - REX   |  32 Bit - REX   |   64 Bit   |
+// +----------------+-----------------+-----------------+------------+
+// |      AL        |      AX         |       EAX       |     RAX    |
+// |      BL        |      BX         |       EBX       |     RBX    |
+// |      CL        |      CX         |       ECX       |     RCX    |
+// |      DL        |      DX         |       EDX       |     RDX    |
+// |      DIL       |      DI         |       EDI       |     RDI    |
+// |      SIL       |      SI         |       ESI       |     RSI    |
+// |      BPL       |      BP         |       EBP       |     RBP    |
+// |      SPL       |      SP         |       ESP       |     RSP    |
+// |      R8B       |      R8W        |       R8D       |     R8     |
+// |      R9B       |      R9W        |       R9D       |     R9     |
+// |      R10B      |      R10W       |       R10D      |     R10    |
+// |      R11B      |      R11W       |       R11D      |     R11    |
+// |      R12B      |      R12W       |       R12D      |     R12    |
+// |      R13B      |      R13W       |       R13D      |     R13    |
+// |      R14B      |      R14W       |       R14D      |     R14    |
+// |      R15B      |      R15W       |       R15D      |     R15    |
+// +----------------+-----------------+-----------------+------------+
+//
+// Special
+// RFLAGS <- lower 32 bits used, upper reserved
+
+#define COM1 0x3f8
+
+static inline void cli()
+{
+    asm volatile ("cli");
+}
+
+static inline void sti()
+{
+    asm volatile ("sti");
+}
+
+static inline void hlt()
+{
+    asm volatile("hlt");
+}
+
+static inline void cpuid_vendor(char* str)
+{
+    int* casted = (int*)str;
+
+    asm volatile ("mov rax, 0; cpuid;"
+                   : "=b" (casted[0]), "=d" (casted[1]), "=c" (casted[2])
+                   : // input in empty
+                   : "eax"); // touched registers
+}
+
+
+static inline void cpuid(uint64_t leaf, uint64_t subleaf, uint32_t* a, uint32_t* b, uint32_t* c, uint32_t* d)
+{
+    uint32_t la, lb, lc, ld;
+
+    asm volatile("cpuid;"
+                : "=a" (la), "=b" (lb), "=c" (lc), "=d" (ld)
+                : "a" (leaf), "c" (subleaf)
+                :
+            );
+    
+    *a = la;
+    *b = lb;
+    *c = lc;
+    *d = ld;
+}
+
+static inline uint64_t xchg(volatile uint64_t *addr, uint64_t newval)
+{
+    uint64_t result;
+
+    // might need to reorder
+    asm volatile ("lock; xchgl %0, %1" :
+                  "+m" (*addr), "=a" (result) :
+                  "1" (newval) :
+                  "cc");
+
+    return result;
+}
+
+static inline void lcr3(uint64_t value)
+{
+    asm volatile ("mov cr3, %0"
+                  :
+                  : "r" (value)
+                  : );
+}
+
+static inline void lgdt(void* ptr)
+{
+    asm volatile ("lgdt [%0];" : : "r" (ptr) );
+}
+
+static inline void lidt(void* ptr)
+{
+    asm volatile ("lidt [%0];" : : "r" (ptr));
+}
+
+static inline void ltr(unsigned short sel)
+{
+    asm volatile ("ltr %0" : : "r" (sel));
+}
+
+static inline uint64_t rrsp()
+{
+    uint64_t r;
+
+    asm volatile ("mov %0, rsp" : "=r" (r) : );
+
+    return r;
+}
+
+static inline void rdmsr(uint32_t msr, uint64_t* d, uint64_t* a)
+{
+    uint64_t ld;
+    uint64_t la;
+
+    asm volatile("rdmsr"
+        : "=d" (ld), "=a" (la)
+        : "c" (msr)
+    );
+
+    *d = ld;
+    *a = la;
+}
+
+static inline void fldcw(const uint16_t control)
+{
+    asm volatile("fldcw %0;"::"m"(control)); 
+}
+
+static inline void outb(uint16_t port, uint8_t val)
+{
+  asm volatile ( "outb %1, %0"
+  :
+  : "a"(val), "Nd"(port) );
+}
+
+static inline void outw(uint16_t port, uint16_t val)
+{
+    asm volatile ("outw %1, %0"
+    :
+    : "a"(val), "Nd"(port) );
+}
+
+static inline void outl(uint16_t port, uint32_t val)
+{
+    asm volatile ("outl %1, %0"
+    :
+    : "a"(val), "Nd"(port) );
+}
+
+static inline uint8_t inb(uint16_t port)
+{
+  uint8_t ret;
+  asm volatile ( "inb %0, %1"
+  : "=a"(ret)
+  : "Nd"(port) );
+  return ret;
+}
+
+static inline uint16_t inw(uint16_t port)
+{
+  uint16_t ret;
+  asm volatile ( "inb %0, %1"
+  : "=a"(ret)
+  : "Nd"(port) );
+  return ret;
+}
+
+static inline uint32_t inl(uint16_t port)
+{
+  uint32_t ret;
+  asm volatile ( "inb %0, %1"
+  : "=a"(ret)
+  : "Nd"(port) );
+  return ret;
+}
-- 
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