Working i386 paging and liballoc

kernel/platform/i386_pc/sys/cpu.h

@@ -0,0 +1,93 @@
+/*
+Copyright 2025 Kamil Kowalczyk
+
+Redistribution and use in source and binary forms, with or
+without modification, are permitted provided that the following
+conditions are met:
+
+1. Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+“AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef _SYS_CPU_H
+#define _SYS_CPU_H
+
+#include <libk/types.h>
+#include <libk/compiler.h>
+
+struct gdt_entry {
+  uint16_t limit_low;
+  uint16_t base_low;
+  uint8_t base_mid;
+  uint8_t access;
+  uint8_t gran;
+  uint8_t base_up;
+} packed;
+
+struct gdt_ptr {
+  uint16_t limit;
+  uint32_t base;
+} packed;
+
+struct tss {
+  uint32_t link;
+  uint32_t esp0, ss0;
+  uint32_t esp1, ss1;
+  uint32_t esp2, ss2;
+  uint32_t cr3;
+  uint32_t eip, eflags, eax, ecx, edx, ebx, esp, ebp, esi, edi;
+  uint32_t es, cs, ss, ds, fs, gs;
+  uint32_t ldt;
+  uint16_t trap;
+  uint16_t iomap;
+} packed;
+
+struct idt_entry {
+  uint16_t base_low;
+  uint16_t sel;
+  uint8_t always0;
+  uint8_t flags;
+  uint16_t base_up;
+} packed;
+
+struct idt_ptr {
+  uint16_t limit;
+  uint32_t base;
+} packed;
+
+struct trapframe {
+  uint32_t edi, esi, ebp, esp, ebx, edx, ecx, eax;
+  uint32_t ds;
+  uint32_t cr3;
+  uint32_t trapno;
+  uint32_t ec;
+  uint32_t eip, cs, eflags, uesp, uss;
+} packed;
+
+void cpu_init(void);
+
+void intr_save(void);
+void intr_restore(void);
+void cpu_relax(void);
+
+#endif // _SYS_CPU_H