From a5dcb987d1afc5f45cfc45178a4ee8f05b22ec1c Mon Sep 17 00:00:00 2001
From: Tulio A M Mendes <tadryanom@hotmail.com>
Date: Thu, 5 Feb 2026 19:39:46 -0300
Subject: [PATCH] hal: add cpu helpers (idle/irqs/stack/as)

---
 include/hal/cpu.h   | 14 +++++++++++
 src/hal/arm/cpu.c   | 35 +++++++++++++++++++++++++++
 src/hal/mips/cpu.c  | 34 ++++++++++++++++++++++++++
 src/hal/riscv/cpu.c | 35 +++++++++++++++++++++++++++
 src/hal/x86/cpu.c   | 59 +++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 177 insertions(+)
 create mode 100644 include/hal/cpu.h
 create mode 100644 src/hal/arm/cpu.c
 create mode 100644 src/hal/mips/cpu.c
 create mode 100644 src/hal/riscv/cpu.c
 create mode 100644 src/hal/x86/cpu.c

diff --git a/include/hal/cpu.h b/include/hal/cpu.h
new file mode 100644
index 0000000..776ac6a
--- /dev/null
+++ b/include/hal/cpu.h
@@ -0,0 +1,14 @@
+#ifndef HAL_CPU_H
+#define HAL_CPU_H
+
+#include <stdint.h>
+
+uintptr_t hal_cpu_get_stack_pointer(void);
+uintptr_t hal_cpu_get_address_space(void);
+
+void hal_cpu_set_kernel_stack(uintptr_t sp_top);
+
+void hal_cpu_enable_interrupts(void);
+void hal_cpu_idle(void);
+
+#endif
diff --git a/src/hal/arm/cpu.c b/src/hal/arm/cpu.c
new file mode 100644
index 0000000..69f6989
--- /dev/null
+++ b/src/hal/arm/cpu.c
@@ -0,0 +1,35 @@
+#include "hal/cpu.h"
+
+#if defined(__aarch64__)
+
+uintptr_t hal_cpu_get_stack_pointer(void) {
+    uintptr_t sp;
+    __asm__ volatile("mov %0, sp" : "=r"(sp));
+    return sp;
+}
+
+uintptr_t hal_cpu_get_address_space(void) {
+    return 0;
+}
+
+void hal_cpu_set_kernel_stack(uintptr_t sp_top) {
+    (void)sp_top;
+}
+
+void hal_cpu_enable_interrupts(void) {
+    __asm__ volatile("msr daifclr, #2" ::: "memory");
+}
+
+void hal_cpu_idle(void) {
+    __asm__ volatile("wfi" ::: "memory");
+}
+
+#else
+
+uintptr_t hal_cpu_get_stack_pointer(void) { return 0; }
+uintptr_t hal_cpu_get_address_space(void) { return 0; }
+void hal_cpu_set_kernel_stack(uintptr_t sp_top) { (void)sp_top; }
+void hal_cpu_enable_interrupts(void) { }
+void hal_cpu_idle(void) { }
+
+#endif
diff --git a/src/hal/mips/cpu.c b/src/hal/mips/cpu.c
new file mode 100644
index 0000000..15b5e2a
--- /dev/null
+++ b/src/hal/mips/cpu.c
@@ -0,0 +1,34 @@
+#include "hal/cpu.h"
+
+#if defined(__mips__)
+
+uintptr_t hal_cpu_get_stack_pointer(void) {
+    uintptr_t sp;
+    __asm__ volatile("move %0, $sp" : "=r"(sp));
+    return sp;
+}
+
+uintptr_t hal_cpu_get_address_space(void) {
+    return 0;
+}
+
+void hal_cpu_set_kernel_stack(uintptr_t sp_top) {
+    (void)sp_top;
+}
+
+void hal_cpu_enable_interrupts(void) {
+}
+
+void hal_cpu_idle(void) {
+    __asm__ volatile("wait" ::: "memory");
+}
+
+#else
+
+uintptr_t hal_cpu_get_stack_pointer(void) { return 0; }
+uintptr_t hal_cpu_get_address_space(void) { return 0; }
+void hal_cpu_set_kernel_stack(uintptr_t sp_top) { (void)sp_top; }
+void hal_cpu_enable_interrupts(void) { }
+void hal_cpu_idle(void) { }
+
+#endif
diff --git a/src/hal/riscv/cpu.c b/src/hal/riscv/cpu.c
new file mode 100644
index 0000000..646f910
--- /dev/null
+++ b/src/hal/riscv/cpu.c
@@ -0,0 +1,35 @@
+#include "hal/cpu.h"
+
+#if defined(__riscv)
+
+uintptr_t hal_cpu_get_stack_pointer(void) {
+    uintptr_t sp;
+    __asm__ volatile("mv %0, sp" : "=r"(sp));
+    return sp;
+}
+
+uintptr_t hal_cpu_get_address_space(void) {
+    return 0;
+}
+
+void hal_cpu_set_kernel_stack(uintptr_t sp_top) {
+    (void)sp_top;
+}
+
+void hal_cpu_enable_interrupts(void) {
+    __asm__ volatile("csrsi mstatus, 0x8" ::: "memory");
+}
+
+void hal_cpu_idle(void) {
+    __asm__ volatile("wfi" ::: "memory");
+}
+
+#else
+
+uintptr_t hal_cpu_get_stack_pointer(void) { return 0; }
+uintptr_t hal_cpu_get_address_space(void) { return 0; }
+void hal_cpu_set_kernel_stack(uintptr_t sp_top) { (void)sp_top; }
+void hal_cpu_enable_interrupts(void) { }
+void hal_cpu_idle(void) { }
+
+#endif
diff --git a/src/hal/x86/cpu.c b/src/hal/x86/cpu.c
new file mode 100644
index 0000000..4c46c9c
--- /dev/null
+++ b/src/hal/x86/cpu.c
@@ -0,0 +1,59 @@
+#include "hal/cpu.h"
+
+#include "gdt.h"
+
+#if defined(__i386__) || defined(__x86_64__)
+
+uintptr_t hal_cpu_get_stack_pointer(void) {
+    uintptr_t sp;
+#if defined(__x86_64__)
+    __asm__ volatile("mov %%rsp, %0" : "=r"(sp));
+#else
+    __asm__ volatile("mov %%esp, %0" : "=r"(sp));
+#endif
+    return sp;
+}
+
+uintptr_t hal_cpu_get_address_space(void) {
+    uintptr_t as;
+#if defined(__x86_64__)
+    __asm__ volatile("mov %%cr3, %0" : "=r"(as));
+#else
+    __asm__ volatile("mov %%cr3, %0" : "=r"(as));
+#endif
+    return as;
+}
+
+void hal_cpu_set_kernel_stack(uintptr_t sp_top) {
+    tss_set_kernel_stack(sp_top);
+}
+
+void hal_cpu_enable_interrupts(void) {
+    __asm__ volatile("sti");
+}
+
+void hal_cpu_idle(void) {
+    __asm__ volatile("hlt");
+}
+
+#else
+
+uintptr_t hal_cpu_get_stack_pointer(void) {
+    return 0;
+}
+
+uintptr_t hal_cpu_get_address_space(void) {
+    return 0;
+}
+
+void hal_cpu_set_kernel_stack(uintptr_t sp_top) {
+    (void)sp_top;
+}
+
+void hal_cpu_enable_interrupts(void) {
+}
+
+void hal_cpu_idle(void) {
+}
+
+#endif
-- 
2.43.0