From b5e2945165c46ae1b13bb817f937e064dde9e488 Mon Sep 17 00:00:00 2001
From: antifallobst <antifallobst@systemausfall.org>
Date: Sat, 11 Mar 2023 10:36:55 +0100
Subject: [PATCH] feature (acpi): requesting RSDP from bootloader

---
 kernel/inc/drivers/acpi/acpi.h | 10 ++++++++++
 kernel/inc/drivers/acpi/rsdp.h | 24 ++++++++++++++++++++++++
 kernel/src/boot/limine.c       | 12 ++++++++++++
 kernel/src/drivers/acpi/acpi.c |  8 ++++++++
 kernel/src/drivers/acpi/rsdp.c |  1 +
 kernel/src/kmain.c             |  6 ++++++
 6 files changed, 61 insertions(+)
 create mode 100644 kernel/inc/drivers/acpi/acpi.h
 create mode 100644 kernel/inc/drivers/acpi/rsdp.h
 create mode 100644 kernel/src/drivers/acpi/acpi.c
 create mode 100644 kernel/src/drivers/acpi/rsdp.c

diff --git a/kernel/inc/drivers/acpi/acpi.h b/kernel/inc/drivers/acpi/acpi.h
new file mode 100644
index 0000000..69bb53b
--- /dev/null
+++ b/kernel/inc/drivers/acpi/acpi.h
@@ -0,0 +1,10 @@
+// This file is part of noxos and licensed under the MIT open source license
+
+#ifndef NOX_ACPI_H
+#define NOX_ACPI_H
+
+#include "boot/boot_info.h"
+
+void acpi_init(boot_info_T* boot_info);
+
+#endif //NOX_ACPI_H
diff --git a/kernel/inc/drivers/acpi/rsdp.h b/kernel/inc/drivers/acpi/rsdp.h
new file mode 100644
index 0000000..e0b1b3b
--- /dev/null
+++ b/kernel/inc/drivers/acpi/rsdp.h
@@ -0,0 +1,24 @@
+// This file is part of noxos and licensed under the MIT open source license
+
+#ifndef NOX_RSDP_H
+#define NOX_RSDP_H
+
+#include "utils/stdtypes.h"
+
+typedef struct {
+    char                    signature   [8];
+    uint8_t                 checksum;
+    char                    oem_id;
+    uint8_t                 revision;
+    uint32_t                rsdt_address;
+} __attribute__((packed)) rsdp_descriptor_v1_T;
+
+typedef struct {
+    rsdp_descriptor_v1_T    descriptor_v1;
+    uint32_t                length;
+    uint64_t                xsdt_address;
+    uint8_t                 checksum_extended;
+    uint8_t                 reserved            [3];
+} __attribute__((packed)) rsdp_descriptor_v2_T;
+
+#endif //NOX_RSDP_H
diff --git a/kernel/src/boot/limine.c b/kernel/src/boot/limine.c
index ef4c840..fa196de 100644
--- a/kernel/src/boot/limine.c
+++ b/kernel/src/boot/limine.c
@@ -32,6 +32,11 @@ static volatile struct limine_module_request module_request = {
         .revision = 4
 };
 
+static volatile struct limine_rsdp_request rsdp_request = {
+        .id       = LIMINE_RSDP_REQUEST,
+        .revision = 5
+};
+
 
 void _start() {
     boot_info_T boot_info;
@@ -85,5 +90,12 @@ void _start() {
     log(LOG_INFO, "( LimineEntry ) Found Ramdisk File");
     boot_info.ramdisk_file = ramdisk_file;
 
+    if (rsdp_request.response == NULL) {
+        log(LOG_ERROR, "( LimineEntry ) no RSDP response!");
+        CORE_HALT_FOREVER
+    }
+    log(LOG_INFO, "( LimineEntry ) Found RSDP");
+    boot_info.rsdp = rsdp_request.response->address;
+
     kmain(boot_info);
 }
\ No newline at end of file
diff --git a/kernel/src/drivers/acpi/acpi.c b/kernel/src/drivers/acpi/acpi.c
new file mode 100644
index 0000000..dde12e3
--- /dev/null
+++ b/kernel/src/drivers/acpi/acpi.c
@@ -0,0 +1,8 @@
+// This file is part of noxos and licensed under the MIT open source license
+
+#include "drivers/acpi/acpi.h"
+#include "utils/logger.h"
+
+void acpi_init(boot_info_T* boot_info) {
+    log(LOG_DEBUG, "Initializing ACPI  -  RSDP: 0x%x", boot_info->rsdp);
+}
\ No newline at end of file
diff --git a/kernel/src/drivers/acpi/rsdp.c b/kernel/src/drivers/acpi/rsdp.c
new file mode 100644
index 0000000..b92bff6
--- /dev/null
+++ b/kernel/src/drivers/acpi/rsdp.c
@@ -0,0 +1 @@
+// This file is part of noxos and licensed under the MIT open source license
diff --git a/kernel/src/kmain.c b/kernel/src/kmain.c
index 9fce1e6..85b6131 100644
--- a/kernel/src/kmain.c
+++ b/kernel/src/kmain.c
@@ -12,6 +12,8 @@
 #include "drivers/time/pit.h"
 #include "drivers/graphics/renderer.h"
 #include "drivers/fs/vfs.h"
+#include "drivers/acpi/acpi.h"
+//#include "drivers/ps2/keyboard.h"
 #include "proc/scheduler.h"
 
 #include "platform/syscall.h"
@@ -39,6 +41,10 @@ void kernel_init(boot_info_T* boot_info) {
 
     vfs_init(boot_info);
 
+    acpi_init(boot_info);
+
+//    ps2_keyboard_init();
+
     scheduler_init(boot_info);
 }